Communication method and communication device

Abstract

Provided are a communication method and a communication device. The method comprises: a first device sends a first PPDU to a second device, wherein the first PPDU comprises a synchronization domain, and a sequence in the synchronization domain comprises a first sequence.

Description

Communication method and communication device

[0001] This application claims priority to PCT application No. PCT / CN2024 / 109907 entitled “Communication method and communication device” filed on August 5, 2024, PCT application No. PCT / CN2024 / 120154 entitled “Communication method and communication device” filed on September 20, 2024, PCT application No. PCT / CN2024 / 131425 entitled “Communication method and communication device” filed on November 11, 2024, PCT application No. PCT / CN2025 / 092456 entitled “Communication method and communication device” filed on April 30, 2025, PCT application No. PCT / CN2025 / 094960 entitled “Communication method and communication device” filed on May 14, 2025, PCT application No. PCT / CN2025 / 108287 entitled “Communication method and communication device” filed on July 11, 2025, PCT application No. PCT / CN2025 / 109467 entitled “Communication method and communication device” filed on July 18, 2025, and PCT application No. PCT / CN2025 / 109696 entitled “Communication method and communication device” filed on July 21, 2025, all of which are incorporated herein by reference in their entirety. TECHNICAL FIELD

[0002] The present application relates to the technical field of communication, and more particularly, to a communication method and a communication device. BACKGROUND

[0003] Wireless fidelity (WiFi) performs data transmission based on a physical layer protocol data unit (PPDU). In different protocol versions, the structure of the PPDU can not be exactly the same. SUMMARY

[0004] The present application provides a communication method and a communication device. Each aspect related to the present application is introduced as follows.

[0005] In a first aspect, a communication method is provided, comprising: a first device sending a first PPDU to a second device; wherein the first PPDU comprises a synchronization field, and a sequence in the synchronization field comprises a first sequence.

[0006] In a second aspect, a communication method is provided, comprising: receiving, by a second device, a first PPDU transmitted by a first device; wherein the first PPDU comprises a synchronization field, and a sequence in the synchronization field comprises a first sequence.

[0007] In a third aspect, a communication device is provided, the communication device being a first device, the communication device comprising: a communication module configured to transmit a first PPDU to a second device; wherein the first PPDU comprises a synchronization field, and a sequence in the synchronization field comprises a first sequence.

[0008] In a fourth aspect, a communication device is provided, the communication device being a second device, the communication device comprising: a communication module configured to receive a first PPDU transmitted by a first device; wherein the first PPDU comprises a synchronization field, and a sequence in the synchronization field comprises a first sequence.

[0009] In a fifth aspect, a communication device is provided, comprising a transceiver, a memory and a processor, the memory being configured to store a program, the processor being configured to invoke the program in the memory and control the transceiver to receive or transmit a signal, so that the communication device performs the method according to the first aspect or the second aspect.

[0010] In a sixth aspect, an apparatus is provided, comprising a processor configured to invoke a program from a memory, so that the apparatus performs the method according to the first aspect or the second aspect.

[0011] In a seventh aspect, a chip is provided, comprising a processor configured to invoke a program from a memory, so that a device installed with the chip performs the method according to the first aspect or the second aspect.

[0012] In an eighth aspect, a computer readable storage medium is provided, having a program stored thereon, the program causing a computer to perform the method according to the first aspect or the second aspect.

[0013] In a ninth aspect, a computer program product is provided, comprising a program, the program causing a computer to perform the method according to the first aspect or the second aspect.

[0014] In a tenth aspect, a computer program is provided, the computer program causing a computer to perform the method according to the first aspect or the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0015] FIG. 1 is an example diagram of a system architecture of a wireless communication system to which embodiments of the present application can be applied.

[0016] FIG. 2 is an example diagram of a zero-power network.

[0017] FIG. 3 is an example diagram of an energy harvesting mode of a zero-power device.

[0018] FIG. 4 is an example diagram of a backscatter communication mode of the zero-power device.

[0019] FIG. 5 is an example diagram of a load modulation mode of the zero-power device.

[0020] FIG. 6 is an example diagram of an encoding mode of the zero-power device.

[0021] FIG. 7 is an example diagram of a PPDU structure provided by the related art.

[0022] FIG. 8 is a flow diagram of a communication method provided by an embodiment of the present application.

[0023] FIG. 9A is an example diagram of a PPDU structure provided by an embodiment of the present application.

[0024] FIG. 9B is another example diagram of a PPDU structure provided by an embodiment of the present application.

[0025] FIG. 9C is yet another example diagram of a PPDU structure provided by an embodiment of the present application.

[0026] FIG. 9D is yet another example diagram of a PPDU structure provided by an embodiment of the present application.

[0027] FIG. 9E is yet another example diagram of a PPDU structure provided by an embodiment of the present application.

[0028] FIG. 9F is yet another example diagram of a PPDU structure provided by an embodiment of the present application.

[0029] FIG. 9G is yet another example diagram of a PPDU structure provided by an embodiment of the present application.

[0030] FIG. 10 is a structural diagram of a communication device provided by an embodiment of the present application.

[0031] FIG. 11 is a structural diagram of a communication device provided by another embodiment of the present application.

[0032] FIG. 12 is a diagram of an apparatus to which embodiments of the present application can be applied.

[0033] FIG. 13 is an example diagram of energy detection provided by an embodiment of the present application.

[0034] FIG. 14 is another example diagram of energy detection provided by an embodiment of the present application.

[0035] FIG. 15 is an example diagram of a receiver structure provided by an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical solutions in the present application will be described below with reference to the accompanying drawings. To facilitate understanding, first, the communication terms and communication processes that can be involved in the embodiments of the present application will be introduced with reference to FIGs. 1 to 6.

[0037] Communication system

[0038] The technical solutions of the embodiments of the present application can be applied to various communication systems, for example, a wireless local area network (WLAN), a wireless fidelity (WiFi), a high performance radio local area network (HIPERLAN), a wide area network (WAN), a cellular network or other communication systems, etc. For example, the technical solutions provided by the embodiments of the present application can be applied to a communication system using an 802.11 standard. Exemplarily, the 802.11 standard includes but is not limited to an 802.11a standard, an 802.11g standard, an 802.11ba standard, an 802.11bp standard, and a next generation 802.11 standard, etc.

[0039] FIG. 1 shows a schematic diagram of a communication system to which the embodiments of the present application are applicable. As shown in FIG. 1, the communication devices in the communication system 100 can include a first device 110 and a second device 120.

[0040] In some scenarios, for example, in a WiFi system, the first device 110 can be a station (STA), and the second device 120 can be an access point (AP). The AP is used to create a wireless network and provide wireless network services for the STA. The STA can access the network through the AP.

[0041] The AP can be a device in a wireless network. The AP can be a communication server, a router, a switch, a bridge, etc. or the AP can include various forms of macro base stations, micro base stations, relay stations, etc. Of course, the AP can also be a chip, a circuit or a processing system in these various forms of devices, so as to implement the methods and functions of the embodiments of the present application. The AP can be applied to various scenarios, for example, a sensor node in a smart city, such as a smart water meter, a smart electricity meter, a smart air detection node; a smart device in a smart home, such as a smart camera, a projector, a display screen, a television, a sound box, a refrigerator, a washing machine, etc.; a node in the Internet of Things; an entertainment terminal, such as an AR, a VR, etc. wearable device; a smart device in a smart office, such as a printer, a projector, etc.; a vehicle networking device in vehicle networking; some infrastructure in daily life, such as a vending machine, a self-service navigation station in a supermarket, a self-service checkout device, a self-service ordering machine, etc.

[0042] A STA can be a device that has a wireless transceiver function, such as supporting the 802.11 series of protocols, and communicates with an AP or other STAs. For example, a STA is any user communication device that allows a user to communicate with an AP and thus a WLAN network. A STA includes, for example, a user equipment (UE), a mobile station (MS), a mobile terminal (MT), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile terminal, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent, or a user device, etc.

[0043] A STA can also be a device that provides voice and / or data connectivity to a user, such as a handheld device with a wireless connection function, a car device, etc. For example, it includes a mobile phone, a tablet computer, a notebook computer, a palm computer, a mobile internet device (MID), a wearable device, a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, a wireless terminal in smart home, a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with a wireless communication function, a computing device or other processing device connected to a wireless modem, a car device, a wearable device, a terminal device in a 5G network, or a terminal device in a future evolved public land mobile network (PLMN), etc. The embodiments of the present application are not limited thereto.

[0044] The STA can also be a wearable device. The wearable device can also be referred to as a smart wearable device, which is a general term for devices that are designed and developed by applying wearable technology to daily wear, such as glasses, gloves, watches, clothing, and shoes. For example, the wearable device includes a smart watch or smart glasses, and focuses on a certain application function, such as a smart bracelet or smart jewelry that needs to be used in cooperation with other devices, such as a smart phone.

[0045] The STA can also be a terminal device in an Internet of Things (IoT) system. The IoT is an important part of future information technology development, and its main technical feature is to connect objects through communication technology and network, so as to realize the intelligent network of human-machine interconnection and object-object interconnection.

[0046] The STA can also be a device in a vehicle-to-everything (V2X) system. The communication mode in the V2X system is collectively referred to as V2X, where X can represent any object. For example, the V2X communication includes vehicle-to-vehicle (V2V) communication, vehicle-to-infrastructure (V2I) communication, vehicle-to-pedestrian (V2P) communication, vehicle-to-network (V2N) communication, and the like.

[0047] In addition, the STA can also include a smart printer, a train detector, a gas station sensor, and the like, and the main functions thereof include collecting data, receiving control information and downlink data of the AP, and transmitting electromagnetic waves to transmit data to the AP.

[0048] The AP in the embodiments of the present application can be a device for communicating with the STA. The AP can be a network device or a terminal device in a wireless local area network, and the AP can be used for communicating with the STA through the wireless local area network.

[0049] From the perspective of the communication mode supported by the AP, in some implementation manners, the AP can be a device that supports the 802.11 mode. Further, the AP can also be a device that supports multiple current and future WLAN modes of the 802.11 family, such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11ba, and 802.11a, such as a device that supports 802.11bp.

[0050] From the perspective of the communication standards supported by the STA, in some implementations, the STA is a device that can support the 802.11 standard. The STA can also support multiple current and future WLAN standards of the 802.11 family, such as the 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11ba, and 802.11a standards, like a device that supports the 802.11bp standard.

[0051] It should be understood that the specific forms of the STA and the AP in the embodiments of the present application are not specially limited, and are only exemplary described herein.

[0052] In addition, the technical solutions implemented by the present application can also be used in other scenarios outside the wifi system. For example, in some other scenarios, the first device 110 can be a terminal device, and the second device 120 can be a network device. The network device can be a device that communicates with the terminal device. The network device can provide communication coverage for a specific geographic area and can communicate with terminal devices located in the coverage area.

[0053] The terminal device can also be referred to as a user equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a mobile station (MS), a mobile terminal (MT), a remote station, a remote terminal, a mobile device, a user terminal, a terminal device, a wireless communication device, a user agent, or a user apparatus. The terminal device, for example, can be a device that provides voice and / or data connectivity for a user, and can be used to connect people, things, and machines, such as household appliances, sensors, electronic tags, etc. with wireless connectivity. The terminal device can also be a wireless terminal in a smart home, a wireless terminal in an IWSN, a wireless terminal in smart logistics and smart warehousing, a wireless terminal in self driving, a wireless terminal in remote medical surgery, a wireless terminal in smart grid, a wireless terminal in transportation safety, a wireless terminal in smart city, etc.

[0054] The network device can be a device for communicating with the terminal device. The network device can also be an access network device or a radio access network device, for example, the network device can be a base station. The network device in the embodiments of the present application can refer to a radio access network (RAN) node or device that accesses the terminal device to the wireless network. The base station can broadly cover various names in the following or can be replaced by the following names, for example: node B (NodeB), evolved node B (eNB), next generation node B (gNB), relay station, access point, transmitting and receiving point (TRP), transmitting point (TP), master station (MeNB), auxiliary station (SeNB), multi-standard radio (MSR) node, home base station, network controller, access node, wireless node, access point (AP), transmission node, transceiver node, baseband unit (BBU), remote radio unit (RRU), active antenna unit (AAU), remote radio head (RRH), central unit (CU), distributed unit (DU), positioning node, etc. The base station can be a macro base station, a micro base station, a relay node, a donor node or the like, or a combination thereof. The base station can also refer to a communication module, modem or chip for being disposed in the foregoing device or apparatus. The base station can also be a mobile switching center and a device that undertakes the function of a base station in device-to-device (D2D), vehicle-to-everything (V2X), machine-to-machine (M2M) communication, network side device in 6G network, device that undertakes the function of a base station in future communication system, etc. The base station can support the network of the same or different access technology. The embodiments of the present application do not limit the specific technology and specific device form adopted by the network device.

[0055] The base station can be fixed or mobile. For example, a helicopter or a drone can be configured to act as a mobile base station, and one or more cells can move according to the location of the mobile base station. In other examples, the helicopter or the drone can be configured to act as a device that communicates with another base station.

[0056] In some deployments, the network device in the embodiments of the present application can refer to a CU or a DU; or the network device includes a CU and a DU. The gNB can also include an AAU.

[0057] The network device and the terminal device can be deployed on land, including indoors or outdoors, handheld or vehicle-mounted; can also be deployed on water surface; and can also be deployed on airplanes, balloons and satellites in the air. The scenarios where the network device and the terminal device are located are not limited in the embodiments of the present application.

[0058] It should be understood that all or part of the functions of the communication device in the present application can also be implemented by software functions running on hardware, or by virtualized functions instantiated on a platform such as a cloud platform.

[0059] FIG. 1 exemplarily shows two first devices 110 and one second device 120. Optionally, the communication system 100 can include multiple second devices 120, and the communication system 100 can also include other numbers of first devices 110.

[0060] Hereinafter, the technical solutions of the embodiments of the present application are described by taking a WIFI system as an example. It can be understood that the technical solutions of the embodiments of the present application can also be extended to other systems.

[0061] Zero-power communication technology

[0062] The zero-power communication network can use energy harvesting and back scattering communication technology for communication. The zero-power communication network is composed of a network device 110 and a zero-power device 120, as shown in FIG. 2. The network device 110 is used to send a wireless power supply signal, a downlink communication signal to the zero-power device 120, and receive a back scattering signal of the zero-power device. A basic zero-power device 120 can include an energy harvesting module, a back scattering communication module and a low-power computing module. In addition, the zero-power device 120 can also have a memory or a sensor for storing some basic information (such as article identification, etc.) or obtaining environmental temperature, environmental humidity and other sensing data. The energy harvesting technology and the back scattering communication technology in the zero-power communication are introduced as follows.

[0063] As shown in FIG. 3, the energy harvesting module realizes the collection of space electromagnetic wave energy based on the principle of electromagnetic induction, and then obtains the energy required to drive the zero-power device to work. For example, the energy harvesting module can be used to drive the low-power demodulation and modulation module, the sensor and the memory and other modules in the zero-power device to work. Therefore, the zero-power device does not need a traditional battery.

[0064] As shown in FIG. 4, the zero-power device 120 receives the wireless signal transmitted by the network device 110. After receiving the wireless signal, the zero-power device 120 modulates the wireless signal to load the information to be transmitted. Then, the zero-power device 120 radiates the modulated signal from the antenna. The above information transmission process is called backscatter communication. Backscattering and load modulation are inseparable. Load modulation adjusts and controls the circuit parameters of the oscillation loop of the zero-power device according to the beat of the data stream, so that the size of the impedance and other parameters change accordingly, thereby completing the modulation. Load modulation technology mainly includes resistance load modulation and capacitance load modulation. In resistance load modulation, a resistance is connected in parallel with the load, and the resistance is turned on or off based on the control of the binary data stream, as shown in FIG. 5. The on-off of the resistance will cause the change of the circuit voltage, thereby realizing amplitude shift keying (ASK), that is, the modulation and transmission of the signal by adjusting the amplitude of the backscattering signal of the zero-power device. Similarly, in capacitance load modulation, the on-off of the capacitance can realize the change of the circuit resonance frequency, realize frequency shift keying (FSK), that is, the modulation and transmission of the signal by adjusting the working frequency of the backscattering signal of the zero-power device.

[0065] As can be seen, the zero-power device modulates the incoming signal by means of load modulation to realize backscatter communication. Therefore, the zero-power device has the following obvious advantages:

[0066] First, the zero-power device does not actively transmit signals, so it does not need complex radio frequency links such as power amplifiers (PAs), radio frequency filters, etc.

[0067] Second, the zero-power device does not need to actively generate high-frequency signals, so it does not need a high-frequency crystal oscillator.

[0068] Third, by means of backscatter communication, the signal transmission of the zero-power device does not consume the energy of the zero-power device itself.

[0069] Due to the obvious advantages of low cost, zero power, small size, etc., the zero-power device can be widely used in various industries. For example, the zero-power device can be applied to logistics, intelligent warehousing, smart agriculture, energy and power, industrial internet, etc. Or, the zero-power device can also be applied to smart wearable, smart home, etc.

[0070] The encoding method that can be used in the zero-power communication process is described below.

[0071] The zero-power communication system can encode a signal using one of the following encoding methods: non-return zero (NRZ) encoding, Manchester encoding, unipolar RZ encoding, differential binary phase (DBP) encoding, Miller encoding, and differential encoding.

[0072] (1) Non-Return Zero (NRZ) Encoding

[0073] NRZ encoding represents binary "1" with a high level and binary "0" with a low level, as shown in (a) of FIG. 6.

[0074] (2) Manchester Encoding

[0075] Manchester encoding is also called split phase coding. In Manchester encoding, the value of a bit is represented by a change (rise / fall) in level at the middle of the bit length, with a negative transition at the middle of the bit period representing binary "1" and a positive transition at the middle of the bit period representing binary "0", as shown in (b) of FIG. 6.

[0076] (3) Unipolar RZ Encoding

[0077] Unipolar RZ encoding represents binary "1" with a high level in the first half of the bit period and binary "0" with a low level signal that continues throughout the bit period, as shown in (c) of FIG. 6. Unipolar RZ encoding can be used to extract a bit synchronization signal.

[0078] (4) Differential Binary Phase (DBP) Encoding

[0079] DBP encoding represents binary "0" with any edge in the middle of the bit period and binary "1" if there is no edge, as shown in (d) of FIG. 6. In addition, the level is inverted at the beginning of each bit period. Thus, it is easier for a receiver to reconstruct the bit clock.

[0080] (5) Miller Encoding

[0081] Miller encoding represents binary "1" with any edge in the middle of the bit period and binary "0" with a constant level in the next bit period. The level is toggled at the beginning of the bit period, as shown in (e) of FIG. 6. Thus, it is easier for a receiver to reconstruct the bit clock.

[0082] (6) Differential Encoding

[0083] In differential encoding, each binary "1" to be transmitted causes a change in signal level, while for binary "0" the signal level remains unchanged.

[0084] The following introduces the classification of zero-power devices.

[0085] In zero-power communication technology, based on the energy source of the zero-power device and the way of energy use, the zero-power device can be divided into three categories: passive zero-power device, semi-passive zero-power device, and active zero-power device.

[0086] The passive zero-power device usually does not need to be equipped with a battery. When the passive zero-power device is close to the network device, the passive zero-power device is in the near-field range formed by the antenna radiation of the network device. At this time, the antenna of the passive zero-power device can generate induced current through electromagnetic induction, and the induced current can power the passive zero-power device to drive the low-power chip circuit of the passive zero-power device, realize the demodulation of the forward link signal, and the signal modulation of the backward link, etc. For the backscatter link, the passive zero-power device can use the backscatter implementation to transmit signals.

[0087] Based on the above introduction, it can be seen that the passive zero-power device does not need to be equipped with a built-in battery to drive, whether it is based on the transmission process of the forward link or the transmission process of the backward link, it is a truly zero-power device.

[0088] In some implementations, the above passive zero-power device can be an electronic tag, and correspondingly, the network device can be a reader / writer of a radio frequency identification (RFID) system, for reading the content in the electronic tag and / or for changing the content in the electronic tag.

[0089] The semi-passive zero-power device itself does not install a conventional battery, but can use an energy harvesting module, such as an RF energy harvesting module to harvest radio wave energy, and at the same time store the harvested energy in an energy storage unit such as a capacitor. After the energy storage unit obtains energy, it can power the zero-power device to drive the low-power chip circuit. Realize the demodulation of the forward link signal, and the signal modulation of the backward link, etc. For the backscatter link, the zero-power device uses the backscatter implementation to transmit signals.

[0090] Based on the above introduction, it can be seen that the semi-passive zero-power device does not need to be equipped with a built-in battery to drive, whether it is based on the transmission process of the forward link or the transmission process of the backward link, although it uses the energy stored in the capacitor in the work, but the energy comes from the radio energy harvested by the energy harvesting module, so it is also a truly zero-power device.

[0091] The active zero-power device can be built-in with a battery. The battery can power the active zero-power device to drive the low-power chip circuit of the active zero-power device to implement demodulation of a forward link signal and modulation of a backward link signal. For a backscatter link, the active zero-power device uses a backscatter implementation to transmit a signal. Therefore, the zero-power of the terminal mainly reflects that the signal transmission of the backward link does not need to consume the power of the terminal itself, but uses the backscatter mode.

[0092] For the active zero-power device, the built-in battery can be used for power supply, so that the communication distance of the active zero-power device can be increased and the communication reliability can be improved. Therefore, the active zero-power device can be applied in some scenarios with relatively high requirements on communication distance, reading delay and the like.

[0093] In some implementations, the active zero-power device described above can be an electronic tag, and the network device can be a radio frequency identification (RFID) reader. At this time, the built-in battery can power the RFID chip in the electronic tag to increase the reading and writing distance between the RFID reader and the electronic tag. On the other hand, the built-in battery can power the RFID chip in the electronic tag to shorten the reading and writing delay of the electronic tag by the RFID reader, which is beneficial to improve the communication reliability.

[0094] In addition to classifying zero-power devices based on energy sources and energy usage modes, zero-power devices can also be classified based on transmitter types.

[0095] First, zero-power devices based on backscatter

[0096] Such zero-power devices use the backscatter mode described above to transmit uplink data. Such devices do not have an active transmitter for active transmission, but only have a backscatter transmitter. Therefore, when the terminal transmits data, the network device needs to provide a carrier, and the terminal device performs backscatter based on the carrier to realize data transmission.

[0097] Second, zero-power devices based on active transmitters

[0098] Such zero-power devices use an active transmitter with active transmission capability to transmit uplink data, so that the zero-power device can transmit data using its own active transmitter when transmitting data, without the need for the network device to provide a carrier. The active transmitter suitable for the zero-power device can be, for example, an ultra-low-power ASK transmitter, an ultra-low-power FSK transmitter, and the like. Based on the current implementation, the overall power consumption of such a transmitter can be reduced to 400-600 uw when transmitting a 100 uw signal.

[0099] Third, zero-power devices with both backscatter and active transmitters

[0100] Such zero-power devices can support both backscattering and active transmitters. The zero-power devices can determine which type of uplink signal transmission to use, i.e., backscattering or active transmitter, based on different situations (e.g., power situation, available ambient energy) or based on the scheduling of the network devices.

[0101] Cellular passive internet of things

[0102] Cellular internet of things technologies are booming, such as the 3rd generation partnership project (3GPP) has standardized narrow band internet of things (NB-IoT), machine type communication (MTC), reduced capability (RedCap), and other internet of things technologies. However, there are still many scenarios of internet of things communication needs that cannot be met, for example:

[0103] First, harsh communication environment

[0104] Some internet of things scenarios may face extreme environments such as high temperature, extremely low temperature, high humidity, high pressure, high radiation, or high-speed motion. For example, ultra-high voltage substations, high-speed train track monitoring, high-cold environment monitoring, industrial production lines, etc. In these scenarios, due to the working environment limitations of conventional power supplies, existing internet of things terminals will not work. In addition, extreme working environments are also not conducive to the maintenance of the internet of things, such as replacing the battery.

[0105] Second, extremely small terminal form factor requirement

[0106] Some internet of things communication scenarios, such as food traceability, commodity circulation, and smart wearables, require terminals to have extremely small sizes to facilitate use in these scenarios. For example, internet of things terminals for commodity management in the circulation link are usually in the form of electronic tags, which are embedded in commodity packaging in a very small form. For another example, lightweight wearable devices can meet user needs while improving user experience.

[0107] Third, extremely low-cost internet of things communication requirement

[0108] Many IoT communication scenarios require the cost of IoT terminals to be low enough to enhance the competitiveness relative to other alternative technologies. For example, in a logistics or warehouse scenario, in order to facilitate the management of a large number of circulating goods, an IoT terminal can be attached to each good, so that the entire process and cycle of logistics can be accurately managed through communication between the terminal and the logistics network. These scenarios require the price of the IoT terminal to be competitive enough.

[0109] Therefore, in order to cover these unmet IoT communication needs, ultra-low-cost, extremely small-size, battery-free / maintenance-free IoT terminals are needed in cellular networks, and zero-power IoT terminals can meet this demand.

[0110] In the process of standardization discussion, zero-power IoT can also be referred to as ambient power enabled IoT (ambient IoT), and some technical literature refers to zero-power IoT as passive IoT. Ambient IoT device means an IoT device that is driven by various ambient energies such as wireless radio frequency energy, light energy, solar energy, thermal energy, and mechanical energy. Such a device can have no energy storage capability or can have very limited energy storage capability (such as using a capacitor with a capacity of several tens of uF). Compared with traditional IoT devices, ambient IoT devices have the advantages of no conventional battery, no maintenance, small size, low complexity, low cost, long life cycle, and the like.

[0111] Based on the discussion of the application scenarios of ambient power enabled IoT by 3GPP SA1, ambient power enabled IoT is proposed to be used in at least the following four scenarios:

[0112] Scenario one: object identification, such as logistics, production line product management, and supply chain management;

[0113] Scenario two: environmental monitoring, such as temperature, humidity, and harmful gas monitoring of working environment and natural environment;

[0114] Scenario three: positioning, such as indoor positioning, intelligent search, and production line article positioning;

[0115] Scenario four: intelligent control, such as intelligent control of various appliances in smart home (turning on / off air conditioner, adjusting temperature) and intelligent control of various facilities in agricultural greenhouse (automatic irrigation, fertilization).

[0116] Typical wifi PPDU structure

[0117] Figure 7 shows the PPDU structure of typical wifi standards (such as 802.11a, 802.11n, 802.11ac, 802.11ax, 802.11ba, etc.). As can be seen from Figure 7, the typical wifi PPDU structure includes a preamble part (legacy short training field (L-STF), legacy long training field (L-LTF)), a compatible physical header (legacy signal (L-SIG)), and a data part, etc. Some PPDU structures also include newly added physical header fields, such as VHT-SIG A1 and VHT-SIG A2 in very high throughput (VHT) (802.11ac).

[0118] In addition, a new type of PPDU structure is also designed in the 802.11ba standard. The PPDU includes a wideband part (20MHz) at the front: legacy preamble (L-STF, L-LTF), L-SIG field, binary phase shift keying mark (BPSK-Mark), and a narrowband part after that. The narrowband part has a bandwidth of 4MHz, and the narrowband part includes a synchronization domain part (Sync) and a data part (data). The wideband part of the PPDU is mainly to ensure compatibility with other wifi devices, so that when a device supporting 802.11ba has data transmission, other devices can recognize the data transmission through the preamble, L-SIG field, etc. of the wideband part, so as to ensure fair use of the channel. The narrowband part of the PPDU is mainly used for wak-up radio (WUR), where the synchronization domain is mainly used for signal synchronization, and the data part is used for data transmission.

[0119] In addition, due to the capability limitation of some devices, the PPDU format can have no legacy preamble part, only the following narrowband part.

[0120] In 802.11ba, the data rate of the data part is indicated by the Sync part.

[0121] Specifically, 802.11ba defines a base sequence W, which has the following form:

[0122] W = [10100100101110110001011100111000].

[0123] If the Sync portion carries a synchronization sequence of two Ws, i.e., [WW], it indicates that the data rate of the PPDU is the low data rate, i.e., 62.5kbps. If the Sync portion carries a complement sequence of Ws then it indicates that the data rate of the PPDU is the high data rate, i.e., 250kbps. The form of the above is as follows:

[0124] The related art is introduced above, and the embodiments of the present application are described in detail below.

[0125] The embodiments of the present application propose a sequence design method, and the designed sequence can be applied to the synchronization domain of a PPDU. The PPDU can be, for example, a PPDU of a protocol other than 802.11ba (such as 802.11bp), such as a PPDU received or transmitted by an AMP device.

[0126] FIG. 8 is a flowchart of a communication method provided by the embodiments of the present application. The method shown in FIG. 8 is described from the perspective of a first device and a second device interacting with a first PPDU (see step S810 in FIG. 8). The first device is the transmitting end of the first PPDU. The second device is the receiving end of the first PPDU.

[0127] In some implementations, the first device is an AP, and the second device is a STA. At this time, the first PPDU can be understood as a downlink PPDU. In this scenario, the second device can be, for example, an AMP device. Illustratively, the second device is an AMP device supporting a backscatter communication mode and / or an AMP device supporting a non-backscatter communication mode (such as an active transmission communication mode). The working frequency of the backscatter communication mentioned here can be, for example, 2.4GHz or S1G.

[0128] In other implementations, the first device is a STA, and the second device is an AP. At this time, the first PPDU can be understood as an uplink PPDU. In this scenario, the first device can be, for example, an AMP device. Illustratively, the first device is an AMP device supporting a backscatter communication mode or an AMP device supporting a non-backscatter communication mode (such as an active transmission communication mode). The working frequency of the backscatter communication mentioned here can be, for example, 2.4GHz or S1G.

[0129] In some implementations, the first PPDU can include a wideband portion (or wideband signal portion) and / or a narrowband portion (or narrowband signal portion). The wideband portion occupies a channel bandwidth that is greater than a channel bandwidth occupied by the narrowband portion. For example, the wideband portion occupies a bandwidth of 20 MHz; the narrowband portion occupies a bandwidth of 4 MHz. The narrowband portion can include a synchronization field (or synchronization domain). The synchronization field can be used to carry a synchronization sequence. The synchronization field mentioned herein can be used for synchronization by a first type of device. The first type of device mentioned herein can be a device other than a WUR-based device. For example, the first type of device is an AMP device. Accordingly, the synchronization field in the first PPDU can be referred to as an AMP synchronization field (AMP-SYNC field, or AMP-SYNC domain).

[0130] In some implementations, each portion in the time domain of the first PPDU can occupy the same bandwidth. For example, the first PPDU can be a typical PPDU structure as described in the section “Typical WiFi PPDU Structure” above. Alternatively, the first PPDU can be a PPDU structure that includes only a narrowband portion. Illustratively, the first PPDU includes a synchronization field and a data field, and the synchronization field precedes the data field.

[0131] In some implementations, the first PPDU does not include a legacy preamble. Further, in some implementations, the first PPDU can include only a narrowband portion. For example, the first PPDU is an uplink PPDU, and the first device is an AMP device. Due to the capability limitation of the AMP device, the AMP device can transmit a PPDU that includes only a narrowband portion without a legacy preamble. Illustratively, the AMP device can transmit the PPDU without a preamble to an AP via a backscatter communication. Alternatively, the AMP device can transmit the PPDU without a preamble to an AP via an active transmission. Illustratively, the first PPDU includes a synchronization field and a data field, and the synchronization field precedes the data field.

[0132] As an example, the first PPDU is a downlink PPDU, and the first PPDU includes a wideband portion and / or a narrowband portion, and the synchronization field is in the narrowband portion.

[0133] As another example, the first PPDU is a downlink PPDU, and each portion in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not include a legacy preamble, or the first PPDU includes only a narrowband portion without a wideband portion. In this case, the first PPDU can include, for example, a synchronization field and a data field, and the synchronization field precedes the data field.

[0134] As another example, the first PPDU is an uplink PPDU, the first PPDU includes a wideband portion and / or a narrowband portion, and the synchronization field is located in the narrowband portion.

[0135] As another example, the first PPDU is an uplink PPDU, each portion in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not include a legacy preamble portion, or the first PPDU only includes a narrowband portion and does not include a wideband portion. In this case, the first PPDU may, for example, include a synchronization field and a data field, and the synchronization field is located before the data field.

[0136] The sequence in the synchronization field of the first PPDU includes a first sequence. In addition, the synchronization field of the first PPDU can also include a combination of one or more of a fourth sequence, a fifth sequence, and a sixth sequence (the first, fourth, fifth, and sixth sequences can be binary sequences). Alternatively, one or more of the fourth sequence, the fifth sequence, and the sixth sequence can also be located in an information field other than the synchronization field of the first PPDU. Embodiments of the present application do not make specific limitations on the implementation of each sequence, and each of the above sequences will be described in detail in turn below.

[0137] The first sequence

[0138] The first sequence is used for synchronization. The synchronization field can only include the first sequence, or can include the first sequence and other sequences. When the synchronization field also includes one or more other sequences, the first sequence can be located before all other sequences, or after a certain sequence among the other sequences, which is not limited by the present application.

[0139] The first sequence can include a first number of 0s and a second number of 1s. The first number and the second number can be equal or not equal. The first number and the second number being equal means that the 1s and 0s in the first sequence each account for half. The 1s and 0s in the first sequence each accounting for half can make the first sequence have better randomness or pseudo-randomness, which makes the first sequence less likely to be cracked, thereby helping to improve the security of information transmission.

[0140] According to the current regulation of institute of electrical and electronics engineers (IEEE), if the time length of the continuous 0 or the continuous 1 in a sequence reaches a certain time length (e.g., 9 microseconds), it represents that the channel is empty, and other devices can occupy the channel. In order to avoid the channel where the first PPDU is located being occupied by other devices, in some implementations, the time length of the modulation symbol corresponding to the continuous 0 or the continuous 1 in the first sequence can be set to be less than or equal to the first time length. The first time length mentioned here can be set according to the relevant regulation of IEEE. For example, the first time length can be set to be less than or equal to 9 microseconds (us). Exemplarily, the first time length can be set to 8 microseconds, 7 microseconds or 6 microseconds. Taking the case that the first sequence is modulated by using on-and-off keying (OOK) modulation as an example (in OOK modulation, the symbol corresponding to 1 bit information can occupy 2 microseconds, for example), the number of the continuous 0 or the continuous 1 in the first sequence can be set to be less than or equal to 4 (or 3). For example, it can be regulated that the number of the continuous 0 or the continuous 1 in the first sequence is less than or equal to 3.

[0141] In some implementations, the first bit of the first sequence is 1. Setting the first bit of the first sequence to 1 can facilitate detection by the receiver. Of course, in other implementations, the first bit of the first sequence can also be 0.

[0142] In some implementations, the sequence in the synchronization field can carry a transmission parameter (or a physical layer parameter). The transmission parameter mentioned here refers to a parameter related to the transmission of the first PPDU. The transmission parameter can include one or more of the following, for example: data rate, symbol length, transmission mode, waveform (or modulation mode), channel number, coding mode. In order to enable the sequence in the synchronization field to carry the transmission parameter, a plurality of candidate sequences can be set for the synchronization field, each candidate sequence in the plurality of candidate sequences can correspond to one or more transmission parameters, and different candidate sequences correspond to different transmission parameters. In this way, when the receiver detects that the first sequence is a certain candidate sequence in the plurality of candidate sequences, it can be determined that the first PPDU is transmitted by using the transmission parameter corresponding to the candidate sequence. By using the synchronization field to carry the transmission parameter, a special indication field for the transmission parameter can be avoided, thereby reducing the number of resources occupied by the first PPDU and improving the overall capacity and efficiency of the communication system.

[0143] It should be noted that different candidate sequences can correspond to one or more of the following: different values of the same transmission parameter; different types of transmission parameters. Some specific examples are given below.

[0144] For example, the transmission parameter carried by the candidate sequence in the synchronization field can comprise a data rate. The data rate can refer to a transmission rate of a data portion of the first PPDU. Illustratively, the candidate sequences of the synchronization field can comprise a first candidate sequence and a second candidate sequence, wherein the first candidate sequence corresponds to a first data rate and the second candidate sequence corresponds to a second data rate. The first data rate can be, for example, a high data rate. The second data rate can be, for example, a low data rate. Illustratively, the first data rate can be 250 kbps and the second data rate can be 62.5 kbps. Alternatively, the first data rate can be 1 Mbps and the second data rate can be 250 kbps. Alternatively, the first data rate can be 4 Mbps or 1 Mbps, and the second data rate can be 1 Mbps (corresponding to 4 Mbps) or 250 kbps (corresponding to 1 Mbps), respectively. For example, the first PPDU is a downlink PPDU, the first data rate is 250 kbps, and the second data rate can be 62.5 kbps. For another example, the first PPDU is an uplink PPDU, and the first device is an AMP device supporting an active transmission communication mode, the first data rate can be 1 Mbps, and the second data rate can be 250 kbps. For another example, the first PPDU is an uplink PPDU, and the first device is a PPDU supporting a backscattering communication mode, the first data rate can be 4 Mbps or 1 Mbps, and the second data rate can be 1 Mbps (corresponding to 4 Mbps) or 250 kbps (corresponding to 1 Mbps), respectively. If the first sequence in the first PPDU is the first candidate sequence, the data rate represented by the first PPDU is the first data rate; if the first sequence in the first PPDU is the second candidate sequence, the data rate represented by the first PPDU is the second data rate.

[0145] For another example, the transmission parameter carried by the candidate sequence in the synchronization field can comprise a symbol length. The symbol length can refer to a time length occupied by a symbol after a bit in the first sequence is modulated into the symbol. Illustratively, the candidate sequences of the synchronization field can comprise a first candidate sequence and a second candidate sequence, wherein the first candidate sequence corresponds to a first symbol length and the second candidate sequence corresponds to a second symbol length. The first symbol length can be, for example, 2 microseconds. The second symbol length can be, for example, 4 microseconds. If the first sequence in the first PPDU is the first candidate sequence, the symbol length represented by the first PPDU is the first symbol length; if the first sequence in the first PPDU is the second candidate sequence, the symbol length represented by the first PPDU is the second symbol length.

[0146] For another example, the transmission parameter carried by the candidate sequence in the synchronization field can include a transmission manner. The transmission manner can refer to whether the first PPDU adopts an active transmission manner or a backscattering transmission manner, for example. Illustratively, the candidate sequence of the synchronization field can include a first candidate sequence and a second candidate sequence, where the first candidate sequence corresponds to the active transmission manner, and the second candidate sequence corresponds to the backscattering transmission manner. If the first sequence in the first PPDU is the first candidate sequence, the transmission manner represented by the first PPDU is the active transmission manner; if the first sequence in the first PPDU is the second candidate sequence, the transmission manner represented by the first PPDU is the backscattering transmission manner.

[0147] For another example, the transmission parameter carried by the candidate sequence in the synchronization field can include a waveform. The waveform can include a first waveform and a second waveform, for example. The first waveform can be an OOK waveform, for example, and the second waveform can be a BPSK waveform, for example. Illustratively, the candidate sequence of the synchronization field can include a first candidate sequence and a second candidate sequence, where the first candidate sequence corresponds to the OOK waveform, and the second candidate sequence corresponds to the BPSK waveform. If the first sequence in the first PPDU is the first candidate sequence, the waveform represented by the first PPDU is the OOK waveform; if the first sequence in the first PPDU is the second candidate sequence, the waveform represented by the first PPDU is the BPSK waveform.

[0148] For another example, the transmission parameter carried by the candidate sequence in the synchronization field can include a channel number (or frequency domain position). The channel number can be used to indicate the frequency domain position of the channel on which the first PPDU is transmitted. Illustratively, the candidate sequence of the synchronization field can include a first candidate sequence and a second candidate sequence, where the first candidate sequence corresponds to a first channel number, and the second candidate sequence corresponds to a second channel number. If the first sequence in the first PPDU is the first candidate sequence, the first PPDU is represented as being transmitted on the channel corresponding to the first channel number; if the first sequence in the first PPDU is the second candidate sequence, the first PPDU is represented as being transmitted on the channel corresponding to the second channel number.

[0149] For another example, the transmission parameter carried by the candidate sequence in the synchronization field can comprise an encoding manner. The encoding manner can comprise a first encoding manner and a second encoding manner. The first encoding manner can be, for example, Manchester encoding. The second encoding manner can be, for example, low density parity check code (LDPC) encoding. By way of example, the candidate sequence of the synchronization field can comprise a first candidate sequence and a second candidate sequence, wherein the first candidate sequence corresponds to the first encoding manner, and the second candidate sequence corresponds to the second encoding manner. If the first sequence in the first PPDU is the first candidate sequence, the encoding manner representing the first PPDU is Manchester encoding; if the first sequence in the first PPDU is the second candidate sequence, the encoding manner representing the first PPDU is LDPC encoding.

[0150] For another example, the candidate sequence of the synchronization field can comprise a first candidate sequence and a second candidate sequence, wherein the first candidate sequence corresponds to a specific data rate and a symbol length, and the second candidate sequence corresponds to a specific data rate and an encoding manner.

[0151] The synchronization field can comprise one or more candidate sequences, and the one or more candidate sequences can be associated with (or determined based on) a base sequence set. The base sequence set can comprise M base sequences, where M is an integer greater than or equal to 1. The base sequence set can be determined by AP configuration, pre-configuration, or a protocol pre-defined manner.

[0152] In some implementations, the one or more candidate sequences of the synchronization field being associated with the base sequence set can comprise: the one or more candidate sequences of the synchronization field being candidate sequences corresponding to the M base sequences. Wherein each base sequence corresponds to N candidate sequences, and N is an integer greater than or equal to 1. It should be understood that the number of N candidate sequences corresponding to each base sequence (i.e., the value of N) can be the same, in which case the number of candidate sequences of the synchronization field can be MxN. Alternatively, the value of N corresponding to at least two base sequences can be different, in which case the total number of candidate sequences can be the sum of the number of candidate sequences corresponding to each base sequence.

[0153] As mentioned above, each base sequence in the base sequence set can correspond to N candidate sequences. The embodiments of the present application do not make specific limitations on the correspondence between the base sequence and the candidate sequence. For example, each base sequence can correspond to N candidate sequences in N ways respectively. The N ways mentioned herein can comprise one or more of the following, for example:

[0154] Way one: the candidate sequence is the corresponding base sequence;

[0155] Way two: the candidate sequence is the complement sequence of the corresponding base sequence;

[0156] The third mode: the candidate sequence is a sequence formed by repeating connection of the corresponding base sequence.

[0157] The fourth mode: the candidate sequence is a sequence formed by repeating connection of the complement sequence of the corresponding base sequence.

[0158] The fifth mode: the candidate sequence is a sequence formed by connection of the corresponding base sequence and the complement sequence of the corresponding base sequence.

[0159] The "candidate sequence is the corresponding base sequence" in the first mode can be understood as directly taking the base sequence as the candidate sequence. Assuming that the base sequence set is [G], and the N modes include the first mode, [G] can be taken as the candidate sequence.

[0160] The "candidate sequence is the complement sequence of the corresponding base sequence" in the second mode can be understood as taking the complement sequence of the base sequence as the candidate sequence. It should be understood that if one sequence is the complement sequence of another sequence, the values of the two sequences at the corresponding bit positions are opposite. For example, assuming that the base sequence set is [G], and the N modes include the second mode, [G] can be taken as the candidate sequence. , wherein, represents the complement sequence set of the base sequence set.

[0161] The "candidate sequence is a sequence formed by repeating connection of the corresponding base sequence" in the third mode can be understood as taking the sequence formed by repeating connection of the base sequence as the candidate sequence. For example, assuming that the base sequence set is [G], and the N modes include the third mode, [G G] and / or [G G G G] can be taken as the candidate sequence.

[0162] The "candidate sequence is a sequence formed by repeating connection of the complement sequence of the corresponding base sequence" in the fourth mode can be understood as taking the sequence formed by repeating connection of the complement sequence of the base sequence as the candidate sequence. For example, assuming that the base sequence set is [G], and the N modes include the fourth mode, [G] and / or [G G G G] can be taken as the candidate sequence. and / or as the candidate sequence.

[0163] The "candidate sequence is a sequence formed by connection of the corresponding base sequence and the complement sequence of the corresponding base sequence" in the fifth mode can be understood as taking the sequence formed by connection of the base sequence and the complement sequence of the base sequence as the candidate sequence. It should be understood that in the candidate sequence, the base sequence and the complement sequence of the base sequence can appear repeatedly or not repeatedly. If the base sequence and the complement sequence of the base sequence appear repeatedly, they can be repeated at equal intervals or not at equal intervals. For example, assuming that the base sequence set is [G], and the N modes include the fifth mode, [G G] and / or [G G G G G G] can be taken as the candidate sequence. as the candidate sequence.

[0164] Alternatively, in some other implementations, the aforementioned "one or more candidate sequences of the synchronization field are associated with the base sequence set" can include or be replaced by: the one or more candidate sequences of the synchronization field include one or more of: one or more base sequences in the base sequence set; a complement sequence of one or more base sequences in the base sequence set; a sequence concatenated from one or more base sequences in the base sequence set; a sequence concatenated from a complement sequence of one or more base sequences in the base sequence set; a sequence concatenated from one or more base sequences in the base sequence set and a complement sequence of one or more base sequences. The aforementioned "concatenation" can refer to the concatenation of two sequences, or the concatenation of more than two sequences, such as the concatenation of four sequences, the concatenation of eight sequences. In some implementations, candidate sequences of different lengths after concatenation can correspond to different transmission parameters. For example, candidate sequences of a first length can correspond to one or more transmission parameters (such as a first data rate), candidate sequences of a second length can correspond to one or more transmission parameters (such as a second data rate), and candidate sequences of the first length and candidate sequences of the second length can correspond to different transmission parameters (such as corresponding to different data rates).

[0165] In some implementations, the correlation of the base sequences in the base sequence set can be designed such that the base sequences in the base sequence set have good correlation with themselves. The base sequences in the base sequence set having good correlation with themselves can facilitate detection, demodulation and transmission of the sequences.

[0166] In some implementations, the characteristics of the base sequences in the base sequence set can be designed, such as: the first sequence or the base sequence corresponding to the first sequence has a plurality (or more) of '10' and / or '01'; or the first sequence or the base sequence corresponding to the first sequence has a plurality (or more) of '01' and / or '10' transitions. For example, when the length of the first sequence or the base sequence corresponding to the first sequence is 16, the first sequence or the base sequence corresponding to the first sequence can have 7 or more '10' or '01' transitions, and the 0 or 1 in the 7 or more transitions do not overlap. For another example, when the length of the first sequence or the base sequence corresponding to the first sequence is 24, the first sequence or the base sequence corresponding to the first sequence can have 7 or more '10' or '01' transitions, and the 0 or 1 in the 7 or more transitions do not overlap. Such characteristics facilitate the identification of the sequence by the amplitude transition of the synchronization field.

[0167] Further, in some implementations, the correlation of the base sequences in the base sequence set can be designed such that the sum of the correlation parameter values of the N candidate sequences corresponding to each base sequence in the base sequence set is as large as possible (such as greater than or equal to a first value). Considering the sum of the correlation parameter values of the candidate sequences during sequence design can enable the base sequences in the base sequence set to achieve the best compatibility effect.

[0168] The calculation manner of the correlation parameter value of each candidate sequence is not specifically limited in the embodiments of the present application. A possible calculation manner is given below.

[0169] In some implementations, the correlation parameter value of each candidate sequence is associated with a sliding correlation result of the candidate sequence and a second sequence corresponding to the candidate sequence, and the second sequence corresponding to the candidate sequence is associated with a base sequence corresponding to the candidate sequence. The second sequence corresponding to the candidate sequence is also referred to as a local code sometimes, and the local code can be used for correlation detection of the candidate sequence by a receiving end device.

[0170] The second sequence corresponding to the candidate sequence mentioned above and the base sequence corresponding to the candidate sequence can include:

[0171] Ref = 2 x G m - 1,

[0172] wherein, Ref represents the second sequence corresponding to the candidate sequence, G m represents the mth sequence in the base sequence set [G], 1≤m≤M, and G m is the base sequence corresponding to the candidate sequence.

[0173] Alternatively, the second sequence corresponding to the candidate sequence mentioned above and the base sequence corresponding to the candidate sequence can include:

[0174] wherein, Ref represents the second sequence corresponding to the candidate sequence, represents the complement sequence of the mth sequence G m in the base sequence set [G], 1≤m≤M, and G m is the base sequence corresponding to the candidate sequence.

[0175] The correlation parameter value of each candidate sequence mentioned above includes: a ratio of the maximum value and the second maximum value in the absolute value of the sliding correlation result of each candidate sequence and the second sequence corresponding to the candidate sequence; or,

[0176] The correlation parameter value of each candidate sequence mentioned above includes: a ratio of the absolute value of the maximum value and the second maximum value in the sliding correlation result of each candidate sequence and the second sequence corresponding to the candidate sequence; or,

[0177] The correlation parameter value of each candidate sequence mentioned above includes: a ratio of the minimum value and the second minimum value in the sliding correlation result of each candidate sequence and the second sequence corresponding to the candidate sequence; or,

[0178] The correlation parameter value of each candidate sequence mentioned above includes: a ratio of the maximum value and the second maximum value in the sliding correlation result of each candidate sequence and the second sequence corresponding to the candidate sequence.

[0179] For the convenience of understanding, several examples of the calculation of relevant parameter values or the sum of relevant parameter values are given below.

[0180] Example 1:

[0181] The synchronization domain includes a candidate sequence, i.e., G. The second sequence (local code) corresponding to G is Ref = 2 x G - 1 (or The relevant parameter value AC of G can be calculated based on the following formula:

[0182] Correlation = xcorr (G, Ref)

[0183] Where xcorr(.) represents a sliding correlation function, Correlation represents the sliding correlation result of G and Ref, Max | Correlation | represents the maximum value in the absolute value of the sliding correlation result, and 2ndLargest | Correlation | represents the second largest value in the absolute value of the sliding correlation result.

[0184] In the case where the length of G is determined, all sequences of the length can be traversed, and the sequence with a larger or even the largest AC value is taken as the candidate sequence, so that the candidate sequence obtained has good correlation.

[0185] Example 2:

[0186] The base sequence set is [G], and the candidate sequences in the synchronization domain are and [G G]. The second sequence (local code) corresponding to the sequences and [G G] is Ref = 2 x G - 1 (or ), and the relevant parameter value AC of the sequence , the relevant parameter value AC of the sequence [G G], and the sum AC of the relevant parameter values of AC H and AC L can be calculated based on the following formula: H L

[0187] Correlation_L = xcorr ([G G], Ref)

[0188] AC = abs (AC H ) + abs (AC L )

[0189] Where xcorr(.) represents a sliding correlation function, Correlation_H represents the sliding correlation result of [G G] and Ref, Max | Correlation_H | represents the maximum value in the absolute value of the sliding correlation result, and 2ndLargest | Correlation_H | represents the second largest value in the absolute value of the sliding correlation result. ​​The sliding correlation results with Ref, Max|Correlation H | represents the maximum absolute value of Correlation_H, 2ndLargest|Correlation_H| represents the second largest absolute value of Correlation_H, Correlation_L represents the sliding correlation result of [GG] and Ref, Max|Correlation L | represents the maximum absolute value of Correlation_L, and 2ndLargest|Correlation_L| represents the second largest absolute value of Correlation_L.

[0190] Given a fixed length G, we can traverse all sequences of that length and select the sequences with larger or even the largest AC values ​​as candidate sequences. The resulting candidate sequences have good correlation and good compatibility among different candidate sequences.

[0191] If the synchronization domain includes more candidate sequences, the relevant parameter values ​​of each candidate sequence can be calculated in a manner similar to Example 2. Then, the relevant parameter values ​​(or the absolute values ​​of the relevant parameter values) of each candidate sequence are added together to maximize the value of AC (even to the maximum). In this way, multiple candidate sequences with good self-correlation can be obtained, and the compatibility between multiple candidate sequences is also good.

[0192] Example 3:

[0193] The synchronization field includes a candidate sequence, G. The second sequence (local code) corresponding to G is Ref = 2 × G - 1 (or The relevant parameter values ​​AC of G can then be calculated based on the following formula:

[0194] Correlation = xcorr(G,Ref)

[0195] Where xcorr(.) represents the sliding correlation function, Correlation represents the sliding correlation result between G and Ref, Max|Correlation| represents the maximum absolute value of the sliding correlation result, and 2ndLargest(Correlation) represents the second largest value of the sliding correlation result.

[0196] Given a fixed length G, we can iterate through all sequences of that length and select the sequences with larger or even the largest AC values ​​as candidate sequences. The resulting candidate sequences will have good correlation.

[0197] Example 4:

[0198] The base sequence set is [G], and the candidate sequences in the synchronization domain are as follows: and [GG]. Sequence The second sequence (local code) corresponding to [GG] is Ref = 2 × G - 1 (or Then the sequence can be calculated based on the following formula. Relevant parameter values ​​AC H The relevant parameter values ​​AC of the sequence [GG] L and AC H and AC L The sum of the relevant parameter values ​​AC:

[0199] Correlation_L=xcorr([GG],Ref)

[0200] AC = abs(AC) H )+abs(AC L )

[0201] Where xcorr(.) represents the sliding correlation function, and Correlation_H represents... The sliding correlation results with Ref are as follows: Min(Correlation_H) represents the minimum value of Correlation_H, 2ndsmallest(Correlation_H) represents the second smallest value of Correlation_H, Correlation_L represents the sliding correlation results between [GG] and Ref, Max(Correlation_L) represents the maximum value of Correlation_L, and 2ndLargest(Correlation_L) represents the second largest value of Correlation_L.

[0202] Considering The correlation peak with Ref = 2 × G - 1 is negative, and the sidelobes that influence the correlation peak are also negative. Therefore, the second smallest negative value has the greatest impact on the detection result. Thus, compared to Example 2, AC H The numerator of the calculation formula can be used to calculate the minimum value, and AC can be omitted. H The absolute value operation of the denominator in the calculation formula.

[0203] Considering that the correlation peak between [GG] and Ref = 2 × G - 1 is positive, and the sidelobe that influences the correlation peak is also positive, the second smallest positive value has the greatest impact on the detection result. Therefore, compared to Example 2, AC can be omitted. L The absolute value operation of the denominator in the calculation formula.

[0204] In the case where the length of G is determined, all sequences of the length can be traversed, and the sequence with the largest AC value is taken as the candidate sequence. The candidate sequence thus obtained has good correlation, and the compatibility between different candidate sequences is good.

[0205] If the synchronization field includes more candidate sequences, the correlation parameter values of the candidate sequences can be calculated in a manner similar to that of Example Four, and then the correlation parameter values (or absolute values of the correlation parameter values) of the candidate sequences are added, so that the AC value is as large as possible (even the maximum). In this way, multiple candidate sequences with good self-correlation can be obtained, and the compatibility between the multiple candidate sequences is also good.

[0206] Example Five:

[0207] The base sequence set is [G], and the candidate sequences in the synchronization field are and [G]. The second sequences (local codes) corresponding to the sequences and [G] are both Ref = 2 x G - 1 (or ). The correlation parameter value AC of the sequence can be calculated based on the following formula: H The correlation parameter value AC of the sequence [G] is L , and the sum of the correlation parameter values of AC H and AC L is AC:

[0208] Correlation_L = xcorr([G], Ref)

[0209] AC = abs(AC H ) + abs(AC L )

[0210] where xcorr(.) represents a sliding correlation function, Correlation_H represents the sliding correlation result of and Ref, Min(Correlation_H) represents the minimum value of Correlation_H, 2ndsmallest(Correlation_H) represents the second smallest value of Correlation_H, Correlation_L represents the sliding correlation result of [G] and Ref, Max(Correlation_L) represents the maximum value of Correlation_L, and 2ndLargest(Correlation_L) represents the second largest value of Correlation_L.

[0211] Considering The correlation peak of Ref=2xG―1 is negative, and the sidelobe that has an impact on the correlation peak is also negative, so the secondary minimum value that has an impact on the detection result is negative. Therefore, compared with Example Two, the AC H The numerator of the calculation formula can calculate the minimum value, and the AC H The absolute value operation of the denominator part in the calculation formula.

[0212] Considering that the correlation peak of [G] and Ref=2xG―1 is positive, and the sidelobe that has an impact on the correlation peak is also positive, so the secondary minimum value that has an impact on the detection result is positive. Therefore, compared with Example Two, the AC L The absolute value operation of the denominator part in the calculation formula.

[0213] In the case where the length of G is determined, all sequences under the length can be traversed, and the sequence with a larger or even maximum AC value is taken as a candidate sequence, so that the candidate sequence obtained has good correlation, and different candidate sequences have good compatibility effect.

[0214] If the synchronization domain includes more candidate sequences, the correlation parameter values of each candidate sequence can be calculated in a similar manner to Example Four, and then the correlation parameter values (or absolute values of the correlation parameter values) of each candidate sequence are added, so that the AC value is as large as possible (even maximum). In this way, multiple candidate sequences with good self-correlation can be obtained, and the compatibility effect between the multiple candidate sequences is also good.

[0215] Example Six:

[0216] The base sequence set is [G], and the candidate sequences in the synchronization domain are and [G]. The second sequences (local codes) corresponding to the sequences and [G] are both Ref=2xG―1 (or ), and the correlation parameter value AC of the sequence H , the correlation parameter value AC L of the sequence [G], and the sum AC of the correlation parameter values of AC H and AC L can be calculated based on the following formula:

[0217] Correlation_L=xcorr([G],Ref)

[0218] AC=abs(AC H )+abs(AC L )

[0219] wherein xcorr(.) denotes a sliding correlation function, Correlation_H denotes the sliding correlation result of [G] and Ref, Max|Correlation_H| denotes the maximum value in the absolute value of Correlation_H, 2ndLargest|Correlation_H| denotes the second largest value in the absolute value of Correlation_H, Correlation_L denotes the sliding correlation result of [G] and Ref, Max|Correlation_L| denotes the maximum value in the absolute value of Correlation_L, and 2ndLargest|Correlation_L| denotes the second largest value in the absolute value of Correlation_L.

[0220] In the case where the length of G is determined, all sequences in the length can be traversed, and the sequence with a larger or even maximum AC value is taken as a candidate sequence. The candidate sequence obtained in this way has good correlation, and the compatibility between different candidate sequences is good.

[0221] If the synchronization domain includes more candidate sequences, the correlation parameter values of the candidate sequences can be calculated in a similar manner as in Example Two, and then the correlation parameter values (or absolute values of the correlation parameter values) of the candidate sequences are added, so that the AC value is as large as possible (even maximum). In this way, multiple candidate sequences with good self-correlation can be obtained, and the compatibility between the multiple candidate sequences is also good.

[0222] The above describes the correlation between the sequences in the synchronization domain or the candidate sequences in the synchronization domain. In some implementations, the sequences in the synchronization domain can have good correlation with the sequences in the PPDUs sent by other types of devices, so that the receiving end device can quickly identify the signal carried by the first PPDU from a large number of wifi signals, thereby facilitating the detection, demodulation and transmission of the first PPDU.

[0223] In some implementations, the first sequence in the first PPDU has good cross-correlation with a third sequence in a second PPDU. The first PPDU can be used for the AP to communicate with the first type of device. The second PPDU can be used for the AP to communicate with the second type of device. Similar to the first PPDU, the second PPDU can also include a wideband part and a narrowband part, and the narrowband part of the second PPDU can also include a synchronization domain. The third sequence mentioned above is the sequence carried in the synchronization domain of the second PPDU.

[0224] ​The second type of device mentioned above can be, for example, a WUR-based device, and the first type of device can be a device other than WUR, such as an AMP device. Accordingly, the third sequence mentioned above can be a sequence in a synchronization field defined in 802.11ba.

[0225] The second PPDU can be a PPDU transmitted or received by another device, such as a third device. Alternatively, in some implementations, the second PPDU can also be a PPDU transmitted or received by the first device; or the second PPDU can be a PPDU received or transmitted by the second device. That is, the first device and / or the second device can simultaneously support the transmission or reception of two different PPDUs.

[0226] It should be noted that the sequence in the synchronization field of the first PPDU or the base sequence associated with the sequence can meet all the conditions mentioned above, or only meet part of the conditions mentioned above. For example, the number of 0s and 1s in the first sequence can be equal, but the first bit of the first sequence can not be 1.

[0227] In the following, several possible forms of the first sequence or the base sequence corresponding to the first sequence are given in conjunction with specific embodiments.

[0228] Alternatively, the length of the first sequence (or the base sequence corresponding to the first sequence) can be even, which can ensure that the number of 1s and 0s in the first sequence (or the base sequence corresponding to the first sequence) is equal. The equal number of 1s and 0s in the first sequence (or the base sequence corresponding to the first sequence) can make the first sequence (or the base sequence corresponding to the first sequence) have better randomness or pseudo-randomness, which makes the first sequence (or the base sequence corresponding to the first sequence) less likely to be cracked, thereby helping to improve the security of information transmission.

[0229] In some implementations, the first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. For example, P = 3. Further, in some implementations, the data field of the first PPDU adopts Manchester coding. When the data field of the first PPDU adopts Manchester coding, the number of consecutive 1s or consecutive 0s in the data field will not exceed 2, and at this time, the number of consecutive 0s or the number of consecutive 1s in the first sequence or the base sequence corresponding to the first sequence is set to be greater than or equal to 3, which can better distinguish the sequence in the synchronization field from the data in the data field.

[0230] In some implementations, the signal before the first sequence in the first PPDU is a signal corresponding to all 0s, or the signal before the first sequence in the first PPDU is a signal corresponding to all 1s.

[0231] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 8. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [01001110], [10110001], [11000101], [10001101], [01110010], [10100011].

[0232] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 10. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [0110111000], [0111001001], [1000101101], [1000110110], [1001000111], [1010010011], [1011000101], [1011010001], [1100100101], [1101000110], [1110001001].

[0233] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 12. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [011100010110], [011010001110].

[0234] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 14. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [00011011101001], [00011101100101], [00101011100110], [00111010100110], [01000111001101], [01001011001110], [01001101011100], [01001101110010], [01010011100110], [01011001000111], [01011001001110], [01011001110010], [01011100010110], [01100011101001], [01101001000111], [01110001001011], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [11010001000111], [11010001010011], [11010010001110], [11010010100011], [11010100110001], [11100010011010], [11100010100101], [00101110110001], [01001011101100], [01001110011010],[01011011100010]，[01100101001110]，[01100111001010]，[01100111010010]，[01110001001110]，[01110001011001]，[01110001011010]，[10010101100011]，[10011100100101]，[10100011100110]，[10100110001110]，[10100110100011]，[10101001100011]，[11000101100101]，[11000110101001]，[11100010100110]，[00100111010110]，[00101101110001]，[00101110101100]，[00110100101110]，[00110101110100]，[00110111010010]，[00110111010100]，[00111000101101]，[00111010011010]，[01000111010110]，[01000111011010]，[01001100011101]，[01001101001110]，[01011000110110]，[01011001011100]，[01011100010011]，[01011100110010]，[01100011100101]，[01100101011100]，[01100101110001]，[01100111010100]，[01101000111010]，[01101001001110]，[01101010001110]，[01101011100010]，[01101011100100]，[01101100011010]，[01101101000110]，[01110001010011]，[01110001010110]，[01110001100101]，[01110001101001]，[01110010001110]，[01110010010110]，[01110010011010]，[01110010101100]，[01110010110010]，[01110100101100]，[10001100101011]，[10001100101101]，[10001100110101]，[10001101001101]，[10001101010011], [10001101110100], [10001110100110], [10001110110010], [10010100010111], [10010111000110], [10011000101101], [10011010001110], [10100011100101], [10100100111001], [10100110001101], [10101001000111], [10101100110001], [10110001000111], [10110001001101], [10110001110010], [10110100011100], [10110100110001], [11000100101101], [11000110001011], [11001001010011], [11001010110001], [11010001001110], [11010001100011], [11010010001101], [11100010001011], [11100010001101], [11100010010011], [11100010010101], [11101000101001], [01001100111010], [01001110110010], [01001011100110],.

[0235] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0236] [1100011010001011]; [1100100101011100]; [1110001001010011]; [0011010110111000]; [0001110101101100]; [0001110110101100]; [0010111010011100]; [0011001001010111]; [0011010110100011]; [0011011010111000]; [0011101001010011]; [0011101010010011]; [1100010101101100]; [1100010110101100]; [1100100101000111]; [1100101001000111]; [1100110110101000]; [0001010110110011]; [1110001010010011]; [0011100101110100]; [1101000101100011]; [0011011010100011].

[0237] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence pair in the synchronization field is 16. For example, the first sequence or the base sequence corresponding to the first sequence pair includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence pair can form one or more of the following sequences after cyclic shifting):

[0238] [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001001101010011]，[1001010001110110]，[1001010110010011]，[1001011001000111]，[1001100010010111]，[1001100101001011]，[1001101001000111]，[1001101010010011]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101010010011]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110], [1101010001101001], [1101010010011001], [1101010011011000], [1101100011010001], [1101100100011010], [1110001000110110], [1110001001010011], [1110001001101001], [1110001001101010], [1110001010001101], [1110001010011001], [1110001011000110], [1110001100100101], [1110010001010011], [1110010001100101], [1110010001101001], [1110010001110100], [1110010010101100], [1110100100011001]..

[0239] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16. If the candidate sequences of the synchronization field are calculated in the manner of “Example One” mentioned above (i.e., the synchronization sequence only includes one candidate sequence), or if the candidate sequences of the synchronization field are calculated in the manner of “Example Two” mentioned above, but only the relevant parameter value AC H , the first sequence or the base sequence corresponding to the first sequence does not include the relevant parameter value AC L , the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0240] [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001001101010011]，[1001010001110110]，[1001010110010011]，[1001011001000111]，[1001100010010111]，[1001100101001011]，[1001101001000111]，[1001101010010011]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101010010011]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110], [1101010001101001], [1101010010011001], [1101010011011000], [1101100011010001], [1101100100011010], [1110001000110110], [1110001001010011], [1110001001101001], [1110001001101010], [1110001010001101], [1110001010011001], [1110001011000110], [1110001100100101], [1110010001010011], [1110010001100101], [1110010001101001], [1110010001110100], [1110010010101100], [1110100100011001]..

[0241] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16. The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. Taking P = 3 as an example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0242] [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001010001110110]，[1001011001000111]，[1001100010010111]，[1001101001000111]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110]，[1101010001101001]，[1101010011011000]，[1101100011010001]，[1101100100011010]，[1110001000110110]，[1110001001010011], [1110001001101001], [1110001001101010], [1110001010001101], [1110001010011001], [1110001011000110], [1110001100100101], [1110010001010011], [1110010001100101], [1110010001101001], [1110010001110100], [1110010010101100], [1110100100011001]..

[0243] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16. The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. Taking P = 3 as an example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0244] [0001010110110011], [0001110101101100], [0001110110101100], [0010111010011100], [0011001001010111], [0011010110100011], [0011010110111000], [0011011010100011], [0011011010111000], [0011100101110100], [0011101001010011], [0011101010010011], [1100010101101100], [1100010110101100], [1100011010001011], [1100100101000111], [1100100101011100], [1100101001000111], [1100110110101000], [1101000101100011], [1110001001010011], [1110001010010011].

[0245] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16. The first bit of the first sequence or the base sequence corresponding to the first sequence is 1, and the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0246] [1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001001101010011]，[1001010001110110]，[1001010110010011]，[1001011001000111]，[1001100010010111]，[1001100101001011]，[1001101001000111]，[1001101010010011]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011], [1100011010100110], [1100100011010011], [1100100100111010], [1100100101011100], [1100101001000111], [1100101001001110], [1100101001011100], [1100101010010011], [1100101100010011], [1100110001001011], [1100110001011010], [1101000110010110], [1101000110011010], [1101000110101100], [1101001000111001], [1101001001100011], [1101001010100011], [1101001100010101], [1101001101000110], [1101010001101001], [1101010010011001], [1101010011011000], [1101100011010001], [1101100100011010], [1110001000110110], [1110001001010011], [1110001001101001], [1110001001101010], [1110001010001101], [1110001010011001], [1110001011000110], [1110001100100101], [1110010001010011], [1110010001100101], [1110010001101001], [1110010001110100], [1110010010101100], [1110100100011001],.

[0247] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16. If the first bit of the first sequence or the base sequence corresponding to the first sequence is 1, then the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0248] [1100010101101100], [1100010110101100], [1100011010001011], [1100100101000111], [1100100101011100], [1100101001000111], [1100110110101000], [1101000101100011], [1110001001010011], [1110001010010011].

[0249] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and the first bit of the first sequence or the base sequence corresponding to the first sequence is 1. The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. Taking P = 3 as an example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (alternatively, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shifting):

[0250] [1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001001101010011]，[1001010001110110]，[1001010110010011]，[1001011001000111]，[1001100010010111]，[1001100101001011]，[1001101001000111]，[1001101010010011]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011], [1100011010100110], [1100100011010011], [1100100100111010], [1100100101011100], [1100101001000111], [1100101001001110], [1100101001011100], [1100101010010011], [1100101100010011], [1100110001001011], [1100110001011010], [1101000110010110], [1101000110011010], [1101000110101100], [1101001000111001], [1101001001100011], [1101001010100011], [1101001100010101], [1101001101000110], [1101010001101001], [1101010010011001], [1101010011011000], [1101100011010001], [1101100100011010], [1110001000110110], [1110001001010011], [1110001001101001], [1110001001101010], [1110001010001101], [1110001010011001], [1110001011000110],.

[0251] In some implementations, the first sequence in the synchronization field or the base sequence corresponding to the first sequence has a length of 16, and a first bit of the first sequence or the base sequence corresponding to the first sequence is 1. The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, where P is a positive integer greater than or equal to 3. For example, when P = 3, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0252] [1100010101101100], [1100010110101100], [1100011010001011], [1100100101000111], [1100100101011100], [1100101001000111], [1100110110101000], [1101000101100011], [1110001001010011], [1110001010010011].

[0253] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0254] [1101000101100011], [1100100101011100], [1100011010001011], [1100010110101100], [1100010101101100], [0011101010010011], [0011101001010011], [0011100101110100], [0011011010100011], [0011010110100011], [0010111010011100].

[0255] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and in the first PPDU, the signal corresponding to the signal of 1 before the first sequence. In this case, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0256] [1101000101100011], [1100100101011100], [1100011010001011], [1100010110101100], [1100010101101100], [0011101010010011], [0011101001010011], [0011100101110100], [0011011010100011], [0011010110100011], [0010111010011100].

[0257] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and there are more '01' or '10' transitions in the first sequence or the base sequence corresponding to the first sequence, so as to facilitate the identification of the sequence by using the transition of the signal amplitude. In this case, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0258] [0110010010101110]，[1001101101010001]，[0100111010011010]，[0101100111010001]，[0101110001101001]，[0101110100110001]，[0110001110100101]，[0110010101100011]，[0111001010110010]，[0111010001101001]，[0111010100101100]，[1000101011010011]，[1000101110010110]，[1000110101001101]，[1001101010011100]，[1001110001011010]，[1010001011001110]，[1010001110010110]，[1010011000101110]，[1011000101100101]，[0010101100110110]，[0010101101100110]，[0010101110010110]，[0010110010111001]，[0010110011100101]，[0010110011101010]，[0010111001011001]，[0010111001100101]，[0010111001101001]，[0010111001101010]，[0011001110100101]，[0011001110101001]，[0011010010101110]，[0011010101100110]，[0011011001010110]，[0011011010100110]，[0011100101011001]，[0011101001011001]，[0011101001100101]，[0011101001101010]，[0100101011100110]，[0100101100111010]，[0100110100111010]，[0100110101001110]，[0100111001101010]，[0101001100111010]，[0101011001001110]，[0101011001011100]，[0101011001101100]，[0101011001110010]，[0101011001110100]，[0101011011000110]，[0101011011001100]，[0101011100100110]，[0101011100110100]，[0101100110001011]，[0101100110100011]，[0101101000110011]，[0101101101000110]，[0101110010110010]，[0101110011001010]，[0101110011010010]，[0110001010110110]，[0110001011001011]，[0110001011101001]，[0110010100101110]，[0110010101101100]，[0110010110001011]，[0110010110100011]，[0110011010101100]，[0110011010110100]，[0110011011010100]，[0110100101011100]，[0110100110001011]，[0110100111010100]，[0110101001101100]，[0110110010101100]，[0110110011010100]，[0110110101000110]，[0111001001101010]，[0111001010100110]，[0111001101000101]，[0111010001100101]，[0111010010100110]，[0111010011010100]，[0111010100100110]，[1000101011011001]，[1000101100101011]，[1000101101011001]，[1000101110011010]，[1000110010111010]，[1000110101011001]，[1000110110010101]，[1001001010111001]，[1001001100101011]，[1001001101010011]，[1001010110010011]，[1001011000101011]，[1001011001110100]，[1001011010100011]，[1001100100101011]，[1001100101001011]，[1001100101010011]，[1001101001011100]，[1001101001110100]，[1001101010010011]，[1001101011010001]，[1001110100010110]，[1001110100110100]，[1001110101001001]，[1010001100101101]，[1010001100110101]，[1010001101001101]，[1010010010111001]，[1010010111001100]，[1010011001011100]，[1010011001110100]，[1010100011001011]，[1010100011011001]，[1010100100110011]，[1010100100111001]，[1010100110001011]，[1010100110001101]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110011000101]，[1011000110010101]，[1011001010110001]，[1011001011000101]，[1011010011000101]，[1011010100011001]，[1100010110010101]，[1100010110011010]，[1100010110100110]，[1100011010100110]，[1100100101011001]，[1100100110101001]，[1100101010011001]，[1100101101010001]，[1100110001010110]，[1100110001011010]，[1101000110010101]，[1101000110010110]，[1101000110011010]，[1101000110100110]，[1101001100010101]，[1101001100011010]，[1101001101000110]，[1101010001101001]，[1101010010011001]，[1101010011001001]，[0010101100101110]，[0011010100110110]，[0011011001101010]，[0101001100101110]，[0101100011001011]，[0101101000111001]，[0110010110101100]，[0110011101010010]，[0110101000110011]，[0111010011001010]，[1000101100110101]，[1001010111001100]，[1001100010101101]，[1001101001010011]，[1010010111000110]，[1010011100110100]，[1010110011010001]，[1100100110010101]，[1100101011001001]，[1101010011010001]，[0010110101100110]，[0011001101101010]，[0011101010010110]，[0101001011100110]，[0101100101110010]，[0101101000111010]，[0101110001011010]，[0110001011011010]，[0110001101101010]，[0110010011101010]，[0110010101001110]，[0110011101001010]，[0110100010111001]，[0110100111000101]，[0110100111010001]，[0110101011001100]，[1001010100110011]，[1001011000101110]，[1001011000111010]，[1001011101000110]，[1001100010110101]，[1001101010110001]，[1001101100010101]，[1001110010010101]，[1001110100100101]，[1010001110100101]，[1010010111000101]，[1010011010001101]，[1010110100011001]，[1100010101101001]，[1100110010010101]，[1101001010011001]，[0011001101010110]，[0011010110100110]，[1100101001011001]，[1100110010101001]。，

[0259] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and / or the first sequence or the first sequence comprises 7 or more non-overlapping '01's and / or '10's; and / or the first sequence or the base sequence corresponding to the first sequence comprises 7 or more non-overlapping transitions of '01's and / or '10's, thereby facilitating the use of the transitions in the signal amplitude to identify the sequence. In this case, if the candidate sequences of the synchronization field are computed in the manner of "Example Five" mentioned above, the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after a cyclic shift):

[0260] [0111010001011010]，[1001011010100011]，[0110100111010100]，[0101101000110011]，[1000101110100101]，[1010010101110001]，[0111000101011010]，[0110010110101010]，[0010101110010110]，[1010011010110001]，[0111000110011010]，[1001101001010101]，[0011001110100101]，[1010100110010110]，[0111001010011010]，[1010010111001100]，[0101011001101001]，[1100110001011010]，[1000110101100101]，[1010010111010001]，[0101100101001110]，[1101010001101001]，[1000111001100101]，[1010011001110001]，[0101101010001110]，[0011100110010110]，[1000111010100101]，[1010101001011001]，[0110100101011100]，[0011101010010110]，[1001011000101011]，[1100010101101001]，[0110100110001011]，[0101010110100110]，[1001011001100011]，[1100011001101001]，[0110100110010101]，[0101100110001110]，[1001011001101010]，[0010111001101001]，[0110100110011100]，[0101101000101110]，[1001011001110100]，[1101000110010110]。

[0261] In particular, in some implementations, the first sequence or the base sequence corresponding to the first sequence in the synchronization field has a length of 16, and the first sequence or the first sequence includes 8 '01's and / or '10's that do not overlap with each other; and / or, the first sequence or the base sequence corresponding to the first sequence includes 8 transitions of '01's and / or '10's that do not overlap with each other, so as to facilitate identification of the sequence by using the transitions of the signal amplitude, and the correlation is good and also suitable for correlation detection. In this case, if the candidate sequence of the synchronization field is calculated in the manner of "Example Five" mentioned above, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0262] [0101011001101001], [0101010110100110], [1001011001101010], [1001101001010101], [0110100110010101], [0110010110101010], [1010100110010110], [1010101001011001].

[0263] In some implementations, the first sequence or the base sequence corresponding to the first sequence in the synchronization field has a length of 16, and / or the first sequence or the first sequence includes 7 or more '01's and / or '10's that do not overlap with each other; and / or, the first sequence or the base sequence corresponding to the first sequence includes 7 or more transitions of '01's and / or '10's that do not overlap with each other, so as to facilitate identification of the sequence by using the transitions of the signal amplitude. In this case, if the candidate sequence of the synchronization field is calculated in the manner of "Example Four" mentioned above, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0264] [0111010001011010], [1000110101100101], [1000111001100101], [0101101000101110], [1001011001101010], [1000111010100101], [1001011001100011], [1001101001010101], [0011001110100101], [1001011000101011], [1010010101110001], [1010010111001100], [0101011001101001], [1010101001011001], [1010011010110001], [1100010101101001], [0110100110001011], [1100011001101001], [1101010001101001], [1101000110010110].

[0265] In particular, in some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and the first sequence or the first sequence includes 8 '01' and / or '10' that do not overlap with each other; and / or, the first sequence or the base sequence corresponding to the first sequence includes 8 '01' and / or '10' transitions that do not overlap with each other, so as to facilitate the use of the transition of the signal amplitude to identify the sequence, and the correlation is good, and is also suitable for correlation detection. In this case, if the candidate sequence of the synchronization field is calculated in the manner of "Example Four" mentioned above, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0266] [1001011001101010], [1001101001010101], [1010101001011001], [0101011001101001].

[0267] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and / or the first sequence or the first sequence comprises 7 or more non-overlapping '01's and / or '10's; and / or the first sequence or the base sequence corresponding to the first sequence comprises 7 or more non-overlapping transitions of '01's and / or '10's, thereby facilitating the use of the transitions in the signal amplitude to identify the sequence. In this case, if the candidate sequences of the synchronization field are computed in the manner of "Example Six" mentioned above, the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after a cyclic shift):

[0268] [0110010010101110]，[1001101001110100]，[0101011011001100]，[0101100011001011]，[1001101101010001]，[1001101010010011]，[0101011100100110]，[0101101000111001]，[0100111010011010]，[1001101011010001]，[0101011100110100]，[0110010110101100]，[0101100111010001]，[1001110100010110]，[0101100110001011]，[0110011101010010]，[0101110001101001]，[1001110100110100]，[0101100110100011]，[0110101000110011]，[0101110100110001]，[1001110101001001]，[0101101000110011]，[0111010011001010]，[0110001110100101]，[1010001100101101]，[0101101101000110]，[1000101100110101]，[0110010101100011]，[1010001100110101]，[0101110010110010]，[1001010111001100]，[0111001010110010]，[1010001101001101]，[0101110011001010]，[1001100010101101]，[0111010001101001]，[1010010010111001]，[0101110011010010]，[1001101001010011]，[0111010100101100]，[1010010111001100]，[0110001010110110]，[1010010111000110]，[1000101011010011]，[1010011001011100]，[0110001011001011]，[1010011100110100]，[1000101110010110]，[1010011001110100]，[0110001011101001]，[1010110011010001]，[1000110101001101]，[1010100011001011]，[0110010100101110]，[1100100110010101]，[1001101010011100]，[1010100011011001]，[0110010101101100]，[1100101011001001]，[1001110001011010]，[1010100100110011]，[0110010110001011]，[1101010011010001]，[1010001011001110]，[1010100100111001]，[0110010110100011]，[0010110101100110]，[1010001110010110]，[1010100110001011]，[0110011010101100]，[0011001101101010]，[1010011000101110]，[1010100110001101]，[0110011010110100]，[0011101010010110]，[1011000101100101]，[1010100110010011]，[0110011011010100]，[0101001011100110]，[0010101100110110]，[1010100110100011]，[0110100101011100]，[0101100101110010]，[0010101101100110]，[1010100110110001]，[0110100110001011]，[0101101000111010]，[0010101110010110]，[1010110011000101]，[0110100111010100]，[0101110001011010]，[0010110010111001]，[1011000110010101]，[0110101001101100]，[0110001011011010]，[0010110011100101]，[1011001010110001]，[0110110010101100]，[0110001101101010]，[0010110011101010]，[1011001011000101]，[0110110011010100]，[0110010011101010]，[0010111001011001]，[1011010011000101]，[0110110101000110]，[0110010101001110]，[0010111001100101]，[1011010100011001]，[0111001001101010]，[0110011101001010]，[0010111001101001]，[1100010110010101]，[0111001010100110]，[0110100010111001]，[0010111001101010]，[1100010110011010]，[0111001101000101]，[0110100111000101]，[0011001110100101]，[1100010110100110]，[0111010001100101]，[0110100111010001]，[0011001110101001]，[1100011010100110]，[0111010010100110]，[0110101011001100]，[0011010010101110]，[1100100101011001]，[0111010011010100]，[1001010100110011]，[0011010101100110]，[1100100110101001]，[0111010100100110]，[1001011000101110]，[0011011001010110]，[1100101010011001]，[1000101011011001]，[1001011000111010]，[0011011010100110]，[1100101101010001]，[1000101100101011]，[1001011101000110]，[0011100101011001]，[1100110001010110]，[1000101101011001]，[1001100010110101]，[0011101001011001]，[1100110001011010]，[1000101110011010]，[1001101010110001]，[0011101001100101]，[1101000110010101]，[1000110010111010]，[1001101100010101]，[0011101001101010]，[1101000110010110]，[1000110101011001]，[1001110010010101]，[0100101011100110]，[1101000110011010]，[1000110110010101]，[1001110100100101]，[0100101100111010]，[1101000110100110]，[1001001010111001]，[1010001110100101]，[0100110100111010]，[1101001100010101]，[1001001100101011]，[1010010111000101]，[0100110101001110]，[1101001100011010]，[1001001101010011]，[1010011010001101]，[0100111001101010]，[1101001101000110]，[1001010110010011]，[1010110100011001]，[0101001100111010]，[1101010001101001]，[1001011000101011]，[1100010101101001]，[0101011001001110]，[1101010010011001]，[1001011001110100]，[1100110010010101]，[0101011001011100]，[1101010011001001]，[1001011010100011]，[1101001010011001]，[0101011001101100]，[0010101100101110]，[1001100100101011]，[0011001101010110]，[0101011001110010]，[0011010100110110]，[1001100101001011]，[0011010110100110]，[0101011001110100]，[0011011001101010]，[1001100101010011]，[1100101001011001]，[0101011011000110]，[0101001100101110]，[1001101001011100]，[1100110010101001]。，

[0269] In particular, in some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and the first sequence or the first sequence comprises 8 '01' and / or '10' that do not overlap with each other; and / or, the first sequence or the base sequence corresponding to the first sequence comprises 8 '01' and / or '10' that do not overlap with each other, so as to facilitate the identification of the sequence by using the jump of the signal amplitude, and the correlation is good, and it is also suitable for correlation detection. In this case, if the candidate sequence of the synchronization field is calculated in the manner of "Example Six" mentioned above, the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0270] [0101100110011010],[0110011001010110],[1001100101011001],[1001100101101001],[0101101001100110],[0110011001011010],[1010010110011001],[1001100110100101],[0110011010100110],[0110011010010110],[1010011001100101],[1001100110101001],[0110100110011010],[0110011010011010],[0101100101100110],[1001101001011001],[0110101001100110],[0110100101100110],[0101100110010110],[1001101010011001],[1001010110011001],[1001011010011001],[0110010101100110],[1010011001101001],[1001011001100101],[1001100101100101],[0110010110100110],[1010011010011001]。

[0271] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and / or the first sequence or the first sequence comprises 7 or more non-overlapping '01' and / or '10', and / or the base sequence corresponding to the first sequence comprises 7 or more non-overlapping transitions of '01' and / or '10', so as to facilitate the identification of the sequence by using the transitions of the signal amplitude. In this case, if the candidate sequence of the synchronization field is calculated in the manner of the aforementioned "Example Two", the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences (or the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0272] [1000101110010110]，[1011000101100101]，[0110110101000110]，[0011010101100110]，[1001101101010001]，[1011010100011001]，[0111001101000101]，[0011101001011001]，[0010110101100110]，[1100010110100110]，[0111010001101001]，[0011101010010110]，[0010111001100101]，[1100110001010110]，[0111010010100110]，[0100111010011010]，[0011001101010110]，[1100110001011010]，[0111010100100110]，[0101011100110100]，[0011001110101001]，[1101000110010110]，[0111010100101100]，[0101100101110010]，[0011010010101110]，[1101000110011010]，[1000101011010011]，[0101101000111001]，[0100101011100110]，[1101001100010101]，[1000101011011001]，[0101101101000110]，[0100101100111010]，[1101001101000110]，[1000101101011001]，[0101110011010010]，[0101001011100110]，[1101010010011001]，[1000110101011001]，[0110001010110110]，[0101001100111010]，[0011011001101010]，[1001001010111001]，[0110001011011010]，[0101011011001100]，[0101011001101100]，[1001001100101011]，[0110011010101100]，[0101011100100110]，[0101110001101001]，[1001011000101110]，[0110011010110100]，[0101100110001011]，[0101110100110001]，[1001011101000110]，[0110100111010001]，[0101101000110011]，[0110010011101010]，[1001100100101011]，[0111001010100110]，[0101110011001010]，[0110100111000101]，[1001100101001011]，[1001010100110011]，[0110001011001011]，[1000110010111010]，[1001101001011100]，[1001010111001100]，[0110001011101001]，[1001100101010011]，[1001101011010001]，[1001011000111010]，[0110010010101110]，[1001110001011010]，[1001110100010110]，[1001011001110100]，[0110010100101110]，[1010100100110011]，[1001110101001001]，[1001100010101101]，[0110010101001110]，[1011010011000101]，[1010001100101101]，[1001100010110101]，[0110010110100011]，[1100100110010101]，[1010001100110101]，[1001101010110001]，[0110011011010100]，[1100101010011001]，[1010001110010110]，[1001101100010101]，[0110011101001010]，[1101010011001001]，[1010010010111001]，[1001110100100101]，[0110100101011100]，[0010101101100110]，[1010010111000110]，[1010010111001100]，[0110100110001011]，[0010110011101010]，[1010011001110100]，[1010110100011001]，[0110101000110011], [0010111001101001], [1010100011011001], [1100010101101001], [0110101011001100], [0011001101101010], [1010100110010011], [1100110010010101], [0110110011010100], [0011001110100101], [1010110011000101], [1100110010101001], [1101001010011001].

[0273] In particular, in some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 16, and the first sequence or the first sequence includes 8 '01' and / or '10' that do not overlap with each other; and / or, the first sequence or the base sequence corresponding to the first sequence includes 8 '01' and / or '10' transitions that do not overlap with each other, so as to facilitate the use of the transition of the signal amplitude to identify the sequence, and the correlation is good, and is also suitable for correlation detection. In this case, if the candidate sequence of the synchronization field is calculated in the manner of "Example Two" mentioned above, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0274] [0101100101100110]，[0110101001100110]，[0110011001011010]，[1001100110100101]，[0101100110010110]，[1001010110011001]，[0110011010010110]，[1001101001011001]，[0101100110011010]，[1001011001100101]，[0110011010011010]，[1010010110011001]，[0101101001100110]，[1001011010011001]，[0110011010100110]，[1010011001100101]，[0110010101100110]，[1001100101011001]，[0110100101100110]，[1010011001101001]，[0110010110100110]，[1001100101100101]，[0110100110011010]，[1010011010011001]。

[0275] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 18. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [011001010110111000], [100110101001000111], [111000100101011001], [000111011010100110], [101001011100010011], [000101110110101100], [000110110111010100], [000111001101101010], [000111010110110010], [000111011011001010], [000111011100101100], [001101001110111000], [001101011000101110], [001101011011101000], [001110010010111010], [010010010111001110], [010010011100111010], [010011011100011010], [010100110110111000], [010101101100111000], [010110110001000111], [010110110010001110], [010111010010011100], [011001011010001110], [011001110001011010], [011011000101011100], [011011010001001110], [011100010011011010], [011100010011101001], [011100010101101100], [011100010110100110], [011100011010001011], [011100011100100101], [011100101000101110], [011100111010010010], [011101000110101100], [011101001001011100], [100010111001010011], [100011100100110101], [100100101011100011], [100101110100110001], [100110001110100101], [100110011010001011], [100110101001011100], [100111011010010010], [101001011100010011], [101001101011100011], [101101011100100101], [101101101011100011], [101110011010001011], [101110101001011100], [101111011010010010], [110010011011011010], [110010011101101001], [110010101101101100], [110011010100110110], [110011011010001011], [110011011100100101], [110011101001011100], [110111011010010010], [111001011010001110], [111001110001011010], [111011000101011100], [111011010001001110], [111100010011011010], [111100010011101001], [111100010101101100], [111100010110100110], [111100011010001011], [111100011100100101], [111100101000101110], [111100111010010010], [111101000110101100], [111101001001011100], [111111011010010010], [111111011100100101], [111111101001011100], [111111111011010010], [111111111100100101], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001011], [111111111101001[100111001010001011]，[100111010001001011]，[101000111001100101]，[101001001101110001]，[101001001110100011]，[101001011001000111]，[101001011100011001]，[101001110001001101]，[101010001101100011]，[101010010011100011]，[101100100011100101]，[110001010110100011]，[110001011010100011]，[110001100100101011]，[110001101000101101]，[110001101010010011]，[110001101100010101]，[110001101101000101]，[110001110010010101]，[110010001011010011]，[110010001110100101]，[110010010101110001]，[110010110001000111]，[110100011010010011]，[110100101000100111]，[110101000101100011]，[110101001001100011]，[110101001001110001]，[111000100010110101]，[111000100010110110]，[111000100011011010]，[111000100101001101]，[111000100110100101]，[111000101001001101]，[111000101010010011]，[111000101100101001]，[111000110010010101]，[111001000101001011]，[111010001001010011]，[111010010010001110]，[001101011010001110]，[001101101010001110]，[001110001010110110]，[001110101000110110]，[010001110011011010]，[010100110110001110]，[011000110100101110]，[011000110101110100]，[011001101011100010]，[011010001101110001]，[011011000111001010]，[011011010001000111]，[011011010100011100]，[011100010010010111]，[011100011011000101]，[011100100010110110]，[011101000101001110]，[011101001010001110]，[100010110110001101]，[100011100100101011]，[100011101010010011]，[100011101100010110]，[100011101100100101]，[100100111000110101]，[100100111010100011]，[100101001110001011]，[100111011001010001]，[101000101101100011]，[101000110001101101]，[101001011100110001]，[101011000111001001]，[101011001001000111]，[101101100011000101]，[101101101000110001]，[101110001100100101]，[110001010010110011]，[110001010111001001]，[110001101000101011]，[110001101010001011]，[110001110101001001]，[110010100100010111]，[110010100110001011]，[110011010010100011]，[110100010010100111]，[110100010011100011]，[110100010100111001]，[110100010101100011]，[110100110001000111]，[110101000111001001]，[110110010010100011]，[111000100010101101]，[111000100011010011]，[111000100100110101]，[111000101001011001]，[111000110010001011]，[111001010010001011]，[000110110101110100]，[000110111010110100]，[001010110110011100]，[001010111000110110]，[001010111011011000]，[001011010111011000]，[001011101011000110]，[001011101011011000]，[001110011011010100]，[001110100011010110]，[001110100100101110]，[010001110101100110]，[010011011010111000]，[010100111000110110]，[010110001110110010]，[010110011010001110]，[010110110011100010]，[011000111010001101]，[011001010110001110]，[011001110001010110]，[011010001011001110]，[011010001110001011]，[011010001110110001]，[011010100011100110]，[011010110001011100]，[011010111000100110]，[011011000111010100]，[011011100011000101]，[011100010100101110]，[011100010110101100]，[011100011011001010]，[011100100100101110]，[011101000110001101]，[011101001001001110]，[011101001011000110]，[100010100110111001]，[100010100111011001]，[100011000101101101]，[100011001011101001]，[100011001110100101]，[100011011100010110]，[100011100101001101]，[100011101001100101]，[100100101011000111]，[100100111000101011]，[100101001100010111]，[100101001101000111]，[100101001110100011]，[100101110010001110]，[100110111000101001]，[100110111001010001]，[101000110001110110]，[101000110011100101]，[101000110100100111]，[101000110110001110]，[101001001110001110]，[101001100101110001]，[101001100111000101]，[101001101001000111]，[101001110001100101]，[101001110011000101]，[101010001110010011]，[101010010011000111]，[101011010001000111]，[101100010111000110]，[101100011000101110]，[101100011010001011]，[101100011011010001]，[101100011100010110]，[101100100101000111]，[101100101001000111]，[101100101001110001]，[101101000100011011]，[101101000100011101]，[101101000100111001]，[101101000101100011]，[101101010001000111]，[101110001001001011]，[110001000111010011]，[110001001011001011]，[110001001101001011]，[110001010110001101]，[110001011100100101]，[110001011100101001]，[110001110010001011]，[110010001110001011]，[110010010101100011]，[110010010110001011]，[110010011100010101]，[110010100010111001]，[110010100110100011]，[110010100111010001]，[110010101001000111]，[110010110100010011]，[110100010011000111]，[110100010100100111]，[110100010110001101]，[110100011001010011]，[110100011100010011]，[110100100010111001]，[110100100011100011]，[110100100100011101]，[110100101100100011]，[110100110100100011]，[110101000100100111]，[111000100011001011]，[111000100101010011]，[111000100101100101]，[111001001000101011]，[111001001010001011]，[111001001011000101]，[111010001100101001]，[011100010110011010]，[100111010001010011]，[101001001110001101]，[101001100011100101]，[101011001001110001]，[101100011100100101]，[101110001000101101]，[110001010010011011]，[110001110001001011]，[110010001101001011]，[110010111000100011]，[110100010110001110]，[110100011100010110]，[110100011100101001]，[110100101100010011]，[110110001000101101]，[011100011010100110]，[011100110100010110]，[110001011001010011]。，

[0276] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence pair in the synchronization field is 20. For example, the first sequence or the base sequence corresponding to the first sequence pair includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence pair can form one or more of the following sequences after cyclic shift): [00101101011100010011], [01101011010001000111], [11000111010001001011], [00110111000101001011], [11001000111010110100], [11001011010001000111], [00011011011000101011], [00011101110100101001], [00011101110100101100], [00101011100100100111], [00101101110001011100], [00101101110100011100], [00110100101110111000], [00111010001110110100], [10010100101110111000], [11000101110001001011], [11010010001011100011], [11010010001110100011], [11010010100011101100], [11010100011011011000], [11100010001011010011], [11100010001011010110], [11100100100111010100].

[0277] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 22. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [0011010010101110111000], [0011101101001000101110], [0011101110100011010010], [0100101100010111011100], [0100101110100011001110], [0101001001101110001110], [0101100101110010001110], [0110001001110101110100], [0110100111000100010111], [0110110001110001010110], [0111000100010111001011], [0111000100111010011010], [0111000100111010110100], [0111000101001011101100], [0111000111010001001011], [0111000111011001001010], [0111010001100010110110], [1000110111001010001011], [1000110111001101000101], [1000111010010100011011], [1001010111000100100111], [1001011011000101000111], [1001110001011100100101], [1001110110100010100011], [1010110100010011000111], [1010110110010001110001], [1011000100101011100011], [1011010001100111000101], [1011010011101000100011], [1011010100010011000111], [1011100010010110001011], [1100010001011100101101], [1100011001011010001011], [1100011101010010001101], [1100100101010001110011],[1100101100011010100011]，[1100101101010001000111]，[1100110001011010001011]，[1101001000101011100011]，[1101001000111000101110]，[1101010010010011000111]，[1110001000101011010011]，[1110001010001101101001]，[1110001011000101001101]，[1110001011001010001101]，[1110001101010001001101]，[1110001110010010010101]，[1110010010011000101011]，[1110011000101101000101]，[1110100010001110010110]，[0001011101110010110100]，[0001110111010100101100]，[0010110100111011101000]，[0010110101110010001110]，[0010111001011011100010]，[0010111010110001001110]，[0010111010111001000110]，[0011011100010100101110]，[0011100101101000101110]，[0100011101101001110100]，[0100110100011101110010]，[0100111011100010110010]，[0101110001000110110110]，[0110001010111000110110]，[0110001011100011010110]，[0110010010101110001110]，[0110100100010111011100]，[0110100101110010001110]，[0110101110001000110110]，[0110110001110101000110]，[0110110100011000101110]，[0111000100111010010110]，[0111000101100101001110]，[0111000111010100100110]，[0111001000111000101101]，[0111001100010111010010]，[0111010001001011011100]，[0111010001110001001011]，[0111010010010001101110]，[0111011000100100101110]，[1000101110011101001001]，[1000110011101000101101]，[1000111000100110110101]，[1000111010001001011011]，[1000111010010001101011]，[1000111011101000110100]，[1001001011100111010001]，[1001001110011101000101]，[1001110100100101000111]，[1010001001110011100101]，[1010001010011100100111]，[1010001011010001100111]，[1010001101100111000101]，[1010001101110001100101]，[1010001110010100100111]，[1010001110011000101101]，[1010001110011011000101]，[1010011000111011000101]，[1010100100100111000111]，[1010110001110001001101]，[1010110010001011000111]，[1011000100011101001101]，[1011000111001000101110]，[1011001000101011000111]，[1011001000110101000111]，[1011001000111000110101]，[1011001010001101000111]，[1011001010110001000111]，[1011001110001000101101]，[1011010001011100011001]，[1011010001011100110001]，[1011010011000100010111]，[1011010011100010001011]，[1100010011010110100011]，[1100010011101001001011]，[1100010101100011010011]，[1100010110010100011011]，[1100010110011010100011]，[1100011000101011001011]，[1100011001010110001011]，[1100011010001001011011]，[1100011010100010110011]，[1100011011010010001011]，[1100011100100100101011]，[1100011101000100101101]，[1100011101010001001011]，[1100100100011101010011]，[1100100110100101000111]，[1100101010010011100011]，[1101000101001110010011]，[1101000110100100011101]，[1101000110101001100011]，[1101000111000100100111]，[1101001000100111000111]，[1101001000101110001110]，[1101001010001100100111]，[1101001101010001100011]，[1101001110100010001110]，[1101010001100100100111]，[1101010010010011100011]，[1101100010100101110001]，[1101100010100110100011]，[1101101001000101110001]，[1110001000110101001101]，[1110001001100101001011]，[1110001001101000110101]，[1110001010010010111001]，[1110001010010110010011]，[1110001010110001001101]，[1110001100100100101011]，[1110001110010001001011]，[1110010001011001010011]，[1110010010001110001011]，[1110010010001110101001]，[1110010011000101001011]，[1110010011100101000101]，[1110010100110010001011]，[1110100010001100101101]，[0010110001011101110001]，[0011011101001010001110]，[0011101110100010010110]，[0110001011011010001110]，[0110101000111000110110]，[0110101100011101000110]，[0110110001000111010110]，[0110110001010111000110]，[0110110110001000111010]，[0111000101101101000110]，[0111001000110101110100]，[0111010001001110001101]，[0111010001100101001110]，[0111010010100011101100]，[1000101110011100100101]，[1001001110010100010111]，[1001100011101000101101]，[1010001011001110110001]，[1010001011100111001001]，[1010010011100111010001]，[1010011100111001000101]，[1011001000111000101101]，[1011001011100010001101]，[1011010001000111001101]，[1011010001110001001101]，[1011010001110001001110]，[1011010010001011100011]，[1011100010010001011011]，[1100010100010110111001]，[1100010101100110100011]，[1100010110101100100011]，[1100011100100101010011]，[1100011101010010010011]，[1100100011100101010011]，[1100100100101011000111]，[1100100100101011100011]，[1100100111001010001011]，[1100101001101000100111]，[1100101010011100010011]，[1100101011100010010011]，[1100101100101001000111]，[1100111000101010010011]，[1101000100101101100011]，[1101000100110010100111]，[1101000101001110110001]，[1101000101101000110011]，[1101000101101001100011]，[1101001001011100100011]，[1101001010011001000111]，[1101001011100010001101]，[1101011000100101110001]，[1101101000100100011101]，[1110001001010011010011]，[1110001100100010101101]，[1110001100100010110101]，[1110001101000100110101]，[1110010010100111000101]，[1110100010100111001001]，[1010010011101000111001]，[1011000100011101001011]，[1101101001000101100011]。，

[0278] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 24. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [000110110001011010111010], [000110110011100101101010], [001011011100111010001010], [001101101011010001000111], [001110111001010100110100], [011010100011100010011011], [011100010111001000101101], [100010111010010100111001], [100011000101110110110100], [100011101000110111010010], [100011101100100100101011], [100100101110001100010111], [100101100011011000101011], [100110100110101001000111], [100111001010010111010001], [101001010111000110010011], [101011101001000110110001], [101101001000110001011101], [101101001110010001000111], [110001000110101011001011], [110001010100111010010011], [110001110010001010110110], [110010001011100011010110], [110010010100101110111000], [110100100011011000111010], [110100100100010111001110], [110101000110110001101001], [110101001001001101110001], [110110100100011000101110], [111000101001010011011001], [111001000100011101001011], [111001001110100101000101], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110111010100101100], [000101110[000110011011101010010110]，[000110110011100101010110]，[001001101110001110100101]，[001001110010110001010111]，[001001110111000111010010]，[001100101110101101011000]，[001110001001101101011010]，[001110001001101101101010]，[001110010011101101000101]，[010100101110001110110010]，[010100110001101101110100]，[010100111000101110110010]，[010101101101100100011100]，[010110011100100100010111]，[010110100011100010011011]，[010110100011101000100111]，[010110101001101100111000]，[010110101110001000100111]，[010111000110110001001011]，[010111010010001101100011]，[011000110101101000101110]，[011001100101110101101000]，[011010010101110110011000]，[011010010110001011101100]，[011010011101000100011011]，[011011000110100111010100]，[011011010100010011100011]，[011100111010001001001011]，[100100101110010101000111]，[100100111011010001010011]，[100101001100101110001011]，[100101010001110100100111]，[100101100010111000100111]，[100110010010110101000111]，[101000111001001110110100]，[101001010110010011000111]，[101001011100011101100100]，[101001100011011011101000]，[101010001101001110010011]，[101010010010011011100011]，[101010010110010011000111]，[101011000101100100011101]，[101011010011000100010111]，[101100100010111000110101]，[101100110010100101000111]，[101101000111000100011011]，[101101001000101110110001]，[101101001000111010001101]，[101110001001101000110101]，[101110100011000100101101]，[110001110110010010010101]，[110010101000111010010011]，[110011010001010010100111]，[110100010100101110010011]，[110100011101001100101001]，[110100101011001000111001]，[110100101110001000100111]，[110110001000110100110101]，[110110001000111000101101]，[110110010001110001011010]，[111000101001010011001101]，[111000101011010010011001]，[111000101011010011001001]，[111000110010011010010101]，[111001000111010001101001]，[111001001001100011010101]，[111001001011000101010011]，[111001001011100010101001]，[111001100100010101101001]，[111010001100011101001001]，[111010010100010110011001]，[000101101011101001100110]，[000101110100110011100101]，[000101110101101001100110]，[000101110110110001100101]，[000101110111001101001010]，[000110101101011101001100]，[000110110100011101010110]，[000110110110011100101010]，[000110111000101110010110]，[000110111001010110010110]，[000110111010001110100101]，[000110111010011010100110]，[000110111011100010100101]，[000110111011100010110100]，[000111001101100101011010]，[000111001101100101101010]，[000111010100101100110110]，[000111010100101101100110]，[000111010101100010110110]，[000111010110011010110100]，[000111010110101100100110]，[000111011101001010010011]，[000111011101100011010010]，[000111011101100101001010]，[001001011011100111010001]，[001001101110001110101001]，[001001110111001011001010]，[001001110111010001101001]，[001010111001001110010110]，[001010111011001011000110]，[001011001010100111011100]，[001011010001110111011000]，[001011010100110111000110]，[001011010110011010111000]，[001011011101100011001010]，[001011100010110011010110]，[001011101001010011100110]，[001011101001100111001010]，[001101001010111011101000]，[001101010111000101101100]，[001101010111001011011000]，[001101011101001000110110]，[001101100010110101110100]，[001101100011010011101010]，[001101100111000101011010]，[001101101000110101011100]，[001101101000111010101100]，[001101110011010001011010]，[001101110100011010010110]，[001101110100011100101001]，[001110001101110101001001]，[001110101011000101101100]，[010001011100111011010010]，[010001110110010111001010]，[010010101110001110110010]，[010010110001101110111000]，[010010110111000101110010]，[010010110111001110100010]，[010010110111010001001110]，[010010111000111011100100]，[010011001101011010111000]，[010011011100011101001010]，[010011100111010001011010]，[010011101000111011010010]，[010100010110111001001110]，[010100010111001110110100]，[010100101001101110111000]，[010100101100111011101000]，[010100110001101110110100]，[010100110100111011100100]，[010101001110011011011000]，[010101101001101100111000]，[010110001100110100010111]，[010110010110001000110111]，[010110100010110011101100]，[010110101000111001101100]，[010110101101100100011100]，[010111010110100011011000]，[011000110100110111010100]，[011000111011001010110100]，[011001001101011010111000]，[011001010110010111011000]，[011001011001010110111000]，[011001100101101011101000]，[011001101101001010111000]，[011001110010100101110100]，[011010011010100111011000]，[011010011100100111010100]，[011010101001110011011000]，[011010101110001011011000]，[011010110001110100010011]，[011010110011010001110100]，[011011000100101110101100]，[011011001101001010111000]，[011011010001101010111000]，[011011010001110011101000]，[011100010011011011010100]，[011100100010111011010010]，[011100100111011010001010]，[011101000101101011000110]，[011101000110001001011011]，[100010111001110110100100]，[100011011000100101110101]，[100011011101000100101101]，[100100101011101100011100]，[100100110010110101000111]，[100100111001011000101011]，[100101001110001011101100]，[100101010110001100100111]，[100101011100011101100100]，[100101100010111011100100]，[100101100101011000100111]，[100101101001110100010011]，[100101101010001001100111]，[100110001101011010001011]，[100110011010010100010111]，[100110101001101000100111]，[100110110010100101000111]，[100111000100110101001011]，[100111001001101000101011]，[100111001011001000101011]，[101000101001011100100111]，[101000101101110010011100]，[101001010001110111011000]，[101001010010011011100011]，[101001011100010111011000]，[101001011101000110001101]，[101001011101001100010011]，[101001100011011101101000]，[101001101001110111001000]，[101010110001100100100111]，[101011000110011010001011]，[101011000111010001001101]，[101011001011000100011011]，[101011001110010001001011]，[101011001110010010001011]，[101011010001110001001101]，[101011010110010001000111]，[101011101000110001001011]，[101100010111000100101101]，[101100011000101110100101]，[101100100011100010101101]，[101101000100111010001110]，[101101010001110001001101]，[110001101100010010111010]，[110010001011100101101001]，[110010010111000101010011]，[110010010111001010100011]，[110010011000111010100101]，[110010011100101100010101]，[110010011101001010001011]，[110010100010110111001001]，[110010101000110100100111]，[110010110101000100010111]，[110100010010011100110101]，[110100010110011000110101]，[110100010110101100011001]，[110100100010011100110101]，[110100100011000101110101]，[110100101001100101000111]，[110100110101011000100011]，[110101000100110100111001]，[110101000101100100111001]，[110101000110100111001001]，[110110001000101110010110]，[110110001101001110101000]，[110110010001110001010110]，[111000100010011010110101]，[111000100010011100101101]，[111000100101011001011001]，[111000101001100101001011]，[111001000100011101011010]，[111001000101100101011001]，[111001000101110001011010]，[111001000110101001101001]，[111001001100011010010101]，[111001001100011010101001]，[111001010010100010110011]，[111010001000101011010011]，[111010001000110010110101]，[111010001001001110011010]，[111010001010010110011001]，[111010001011001100011010]，[111010010001001110011010]，[111010100011010011100100]，[111011000100011010011010]，[000101011100101100011011]，[000101101110110001100101]，[000110110100111010101100]，[000111011010100110100110]，[001010110110110010001110]，[001011011011101000110001]，[001011011100100111000101]，[001011101011010001101100]，[010011011101000111001010]，[010101101001110011011000]，[010110100010111001110010]，[011000110110010111010100]，[011010011101000111011000]，[101010010110001100100111]，[110001110110010010100101]，[111000110010011010100101]，[010100111001100101110100]，[100110011010001010010111]，[101001110011001011101000]。，

[0279] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence in the synchronization field is 26. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [01101001000110111010001110], [01110001011101100010010110], [01110001110010001010110110], [01110100011000111011010010], [10001011100111000100101101], [10100101100011101000100111], [10100101110010111000100011], [10110001001011101000111001], [10110001101101000101000111], [10110010001110001110100101], [10111000110001011100100101], [11000100011101001110100101], [11000110011101000101001011], [11000111001010110010001011], [11010010010111010001100011], [11010010100010111001100011], [11011000110110100010100011], [11100010001101010011010011], [11100100010101100011010011], [11100100011011010001010011], [11101000110100011001010011], [01001011011100011000101110], [01100010111011100010110100], [01110001001011011000101110], [01110001011011010001001110], [01110001101101001000101110], [01110010001101011100010110], [10010110100111000100010111], [10011100010111001000101101], [10100011100101101000100111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [10100101101101000101000111], [101001011[10100101110001110110010001]，[10110001100011101000101101]，[10110001110001011100100101]，[10110010100011100010011101]，[10110100011000111010001011]，[11000100111010100110100011]，[11000101110010110010100011]，[11000101110100101000110011]，[11000110110001010001011011]，[11001000101011100011010011]，[11001000111010010110001011]，[11001010010011101001000111]，[11001010100011100100100111]，[11001011000110101000100111]，[11001011001010110001000111]，[11001100010010110100010111]，[11010001001010110011100011]，[11011010001010001101100011]，[11011100010001011000101101]，[11100010001011101001010011]，[11100010100011011010010011]，[11100010100110100100011011]，[11100010110001011001010011]，[11100100100111000101010011]，[11101000101001000110100111]，[11101001000101001110010011]，[00101101000111011101000110]，[01101000111010110001001110]，[01101001011101000110001110]，[01101101010001001110001110]，[01110001100010111010010110]，[01110001101011001000101110]，[01110010001011011010001110]，[01110010001110100100101110]，[01110011000101101000101110]，[01110100010010110110001110]，[01110100010110100011001110]，[01110100011011010010001110]，[01110101001110001001001110]，[10001001101110001110100101]，[10100100101110100011000111]，[10100100111000111010001101]，[10100100111010001100011101]，[10100100111010001110001101]，[10100101110001110001001101]，[10101100100011100010010111]，[10110001100011010001011101]，[10110100010011101000111001]，[10110100010100011101100011]，[10110100010111000110001101]，[10110100100011100111010001]，[10111001000111000101001101]，[10111010001011000110001101]，[11000101000101101100011011]，[11000101001101001110100011]，[11000101100101011100100011]，[11000110001011101001001011]，[11000110111000101000101101]，[11001000111010100011010011]，[11001001011011000101000111]，[11001001110010100010010111]，[11001010001011011000100111]，[11001010010111010001000111]，[11001010011000101100010111]，[11001010011010001101000111]，[11001011000101011100010011]，[11001011000111010100010011]，[11001100010100101110100011]，[11001100011101000101001011], [11010001011010011000100111], [11010001101001011100010011], [11010001110001101010010011], [11010010100010111000110011], [11011000100101100101000111], [11100010100010110110001101], [11100011000101110100100101], [11100100010111000110100101], [11100100011001011010001011], [11100100100110001010100111], [11100101001000110100010111], [11100101010001100100100111], [11101000100011100101101001], [11101000101100010010100111], [11101000101101001000110011], [11101001000111000100110101], [01110100100101110001001110], [10110001011100011100100101], [11001001010110001110001011],.

[0280] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence pair in the synchronization field is 28. For example, the first sequence or the base sequence corresponding to the first sequence pair includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence pair can form one or more of the following sequences after cyclic shift):

[0281] [1110001010100111001001001101]，[1110101000100101110010011100]，[0001011101011010110001101100]，[0001011101011100101011011000]，[0001011101101010010011100011]，[0001101100110101101011101000]，[0001101101100011101010110100]，[0001101110001101001101010110]，[0001110101011000110110110010]，[0001110101110010001101101001]，[0001110110101001110010110010]，[0010011011100010101101011100]，[0010110111010010001110100011]，[0010111010001011010011100110]，[0010111011001001010110001110]，[0011001110100010111001011010]，[0011001110100101101000101110]，[0011001110101101001011101000]，[0011010111010110100011011000]，[0011100010110101001101110100]，[0011100011011010100100010111]，[0011100100111010010001010111]，[0011100101011101000100100111]，[0011100101110010010111010100]，[0011101000101110111001010010]，[0011101000110111010110010100]，[0011101011010100011101100100]，[0011101011100100011010010110]，[0100010111011000111001011010]，[0100011010110111010001110100]，[0100101101110100010111001100]，[0101001011101001101110011000]，[0101011000110110110010111000]，[0101011100111001001001110100]，[0101101001110001101110100010]，[0101101110001101000100010111]，[0110100100111011000101000111]，[0110100101100010011101011100]，[0111000101000110111011010010]，[0111000110101001001101110100]，[0111010001001110001101001011]，[1000101110100101101000110011]，[1000101110110001110010110100]，[1000111001010110110010001011]，[1000111001010110110100010011]，[1000111010111001000100101101]，[1001001011100110001010100111]，[1001010100110100111000100111]，[1001011001010100111001000111]，[1001110011010100100100010111]，[1010001110010001101101110100]，[1010001110010110110100010011]，[1010010010111011000101100011]，[1010010110001110010001011101]，[1010100011000110110110001011]，[1010110010110010001100010111]，[1010110100010110010001100111]，[1010110100110001100100010111]，[1011001001001110010101000111]，[1011001011000110101001000111]，[1011010010001011101000110011]，[1011010010011100010100011011]，[1011010010011101100010100011]，[1011010100011100010010011011]，[1011010110001000101110100011]，[1100010100011011100101101001]，[1100010100101011100010011011]，[1100010111001000101001101011]，[1100011010100010111011011000]，[1100011101001010110010001011]，[1100100010110110101001110001]，[1100100011010011101010001011]，[1100110001010010110100010111]，[1100110001011101000110100101]，[1101000100110101001011100011]，[1101000101001101001110110001]，[1101000101011100101100010011]，[1101000101101001010001100111]，[1101000101110100101100011001]，[1101001000101101110001011100]，[1101010010100011100010011011]，[1101011001010001001110100011]，[1101100010100101001101000111]，[1101100100011100010100101011]，[1101100100011101010010100011]，[1101100100100011100010101101]，[1110001001110010101001101001]，[1110001011001001001110010101]，[1110001011001010010100011011]，[1110010001110010110010101001]，[1110010010001011101010011100]，[1110010010011100010101001011]，[1110010011001010010100010111]，[1110010011010001010010100111]，[1110010011100010100010010111]，[1110010011101001010001010011]，[1110010100010100101110010011]，[1110010100101000101100100111]，[1110100010010101101100011100]，[1110100010110100101000110011]，[1110100100010100011100100111]，[0001011100111011001011001010]，[0001011101101101010011000110]，[0001011101110100111000100101]，[0001101010111001100010110110]，[0001101011010111010011011000]，[0001101100011101011101101000]，[0001110101110011001001011010]，[0001110110001101010110010110]，[0010100110101110110001011100]，[0010110101011100011011011000]，[0010111001001001110011101010]，[0011001110100010111011010010]，[0011010011011101010010001110]，[0011011000101101011101011000]，[0011011101001001010110001110]，[0011100011101100100101011010]，[0011100101110010001011011010]，[0011101000111011010001001011]，[0101001011001110011011101000]，[0101001101001101110011101000]，[0101101001001100111010111000]，[0101101001110100010111001100]，[0101101101000100111010011100]，[0101110001101110010010001011]，[0110100011101011000100011011]，[0110101000110111011001011000]，[0111000110101001001011101100]，[0111001000110100110101110100]，[0111010001011010010111001100]，[1001001100101011100010100111]，[1001010111001000100110100111]，[1001100011010010111010001011]，[1010010001110010111011101000]，[1010010110001011101000110011]，[1010010110110011000101000111]，[1100010100011011100100101101]，[1100010111010001000110101101]，[1100011010001101110100100101]，[1100100010110110100111000101]，[1100100111010010100010100111]，[1100101100100010101101110001]，[1100110001011101000100101101]，[1101000100100111011000111010]，[1101000110110110001100010101]，[1101000111010001001010011101]，[1110001001010110001101001101]，[1110010110010001001110101001]，[1110011000101001011010001011]，[1110100010100101001100100111]，[1110100010100101001110010011]，[0001010111011010001101100011]，[0001011011101011100011011000]，[0001011101001011010111001100]，[0001011101100111001101001010]，[0001100111010110100101110100]，[0001101001101110110001010110]，[0001101011100010101100110110]，[0001101100010110101110101100]，[0001101100101110101101011000]，[0001101101010011101011101000]，[0001101101110100010101100011]，[0001110100110101101011100100]，[0001110100110110110001101010]，[0010011011011100011101010010]，[0010011011100011101011010100]，[0010011101011010110010111000]，[0010011101011100011011010010]，[0010011101110010100011101001]，[0010110100111000110111010001]，[0010111010110010110001001110]，[0010111011001010110100011100]，[0011011000110101101011101000]，[0011011100101100010101110100]，[0011101011100100011011010010]，[0100101011100011101101100100]，[0100101101100010011101011100]，[0100101101100011101011100100]，[0100110100111001010110111000]，[0101110001101001001011101100]，[0110101011001011000111011000]，[0110110100011001110101011000]，[1000110111001011001010001011]，[1000111011010100010011010011]，[1001011011000100111010111000]，[1001011100010100111011100100]，[1010100111001001001101000111]，[1011010010001001110101110001]，[1011100101001000101110001011]，[1011101000100111000110100101]，[1100010111000100101110110100]，[1100011100100101011011101000]，[1100100111001010010100010111], [1100101000101001011100100111], [1100110001011010010111010001], [1101000100110110101001110001], [1101001010100011100100100111], [1101001011000111001000101110], [1101100010001101011100010110], [1101100010100011100100101101], [1110010101000110011101001001], [1110100010010010101100111001], [0001101011101011010001101100], [0010101101011100011101100100], [0010111010010110101110011000], [0100101101110110001010001110], [0110001100101011011011101000], [0110100110101011000110111000],.

[0282] In some implementations, the first sequence or the base sequence corresponding to the first sequence has a length of 30. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shifting):

[0283] [110011100010100010011101001011]，[110100010111001001010011100011]，[110100101110001100010001011101]，[110100101110010001010001110011]，[111001000110001011101001001011]，[111001010001101001001100010111]，[011010011101001000111010001110]，[101100010111000100011100101101]，[101101001110001000111010001101]，[110001011001000111011010100011]，[110001110010100100111010001011]，[110010010001110010101110001011]，[110100011101010011100010010011]，[110110001001110001101000101011]，[111010001100100101100010100111]，[011100010111000100101110010110]，[101001001011100011100010011101]，[101110010001110001110100100101]，[110001010110111000100110100011]，[110100100101110100011000100111]，[110101000101100011100100011011]，[101100010111000111000100101101]，[101101001000111000111010001101]，[111010001010011001000110100111]，[101011011010001000100111000111]，[111000111001000100010110110101]，[111001011000100110010100010111]，[101110001001110100010010010111]。

[0284] In some implementations, the length of the first sequence or the base sequence corresponding to the first sequence is 32. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0285] [00011100111010001101110100100101]；[00101110100010110101101110011000]；[00110111010010100100111000111010]；[01000111011011100010110110001010]；[01011011010001001110100011000111]；[01011100011100100101001011101100]；[01100010011101011010011010111000]；[01110001110110010001001010010111]；[00010110101101110110010001110001]；[00011001110110101101000101110100]；[00011011010100111000101110100110]；[00011101011001011010111001000110]；[01010001101101000111011011100010]；[01100101110100011100101011011000]；[11100100101011000111010001011001]；[10001110001001101110110101101000]；[10100011100011011010110100010011]；[10100100101110110001011100111000]；[10111000100100011101001001110101]；[11001000101101011011000111000101]；[11010001011101001010010001100111]；[11100010100110100101000110111001]；[11100011000101110010001011011010]；[11100110001001010010111010001011]；[10011010001011100011010100100111]；[10011101100010100101100101000111]；[10101110010010111000100100011101]；[11101001010010001001101110001110]。

[0286] Optionally, the length of the first sequence or the base sequence corresponding to the first sequence can be an odd number. The design of such sequence is similar to the design of the sequence with even length, which is not described herein.

[0287] Optionally, the first sequence or the base sequence corresponding to the first sequence can be an m-sequence. The length of the m-sequence is, for example, 2 n -1 (n is a positive integer greater than or equal to 1). The m-sequence has good correlation, and some examples of the m-sequence are given below.

[0288] In some implementations, the length of the first sequence or the base sequence (which can be an m-sequence) corresponding to the first sequence in the synchronization field is 7. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [1001011], [1001110].

[0289] In some implementations, the length of the first sequence or the base sequence (which can be an m-sequence) corresponding to the first sequence in the synchronization field is 15. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift): [100010011010111], [100011110101100].

[0290] In some implementations, the length of the first sequence or the base sequence (which can be an m-sequence) corresponding to the first sequence in the synchronization field is 31. For example, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences (or the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0291] [1000010010110011111000110111010]; [1000010101110110001111100110100]; [1000010110101000111011111001001]; [1000011100110111110100010010101]; [1000011010100100010111110110011]; [1000011001001111101110001010110].

[0292] Optionally, the first sequence or the base sequence corresponding to the first sequence is a gold sequence. The gold sequence has good correlation.

[0293] In some implementations, the m-sequence associated with the gold sequence (e.g., the m-sequence used to generate the gold sequence) has a length of 7, 15 or 31. Exemplarily, the m-sequence (or the sequence formed by cyclically shifting the m-sequence) can include one or more of the following sequences:

[0294] [1001011]; [1001110]; [100010011010111]; [100011110101100]; [1000010010110011111000110111010]; [1000010101110110001111100110100]; [1000010110101000111011111001001]; [1000011100110111110100010010101]; [1000011010100100010111110110011]; [1000011001001111101110001010110].

[0295] It is to be noted that the encoding manner of the sequence mentioned in any of the foregoing embodiments is not specifically limited in the embodiments of the present application. For example, the sequence mentioned in each of the foregoing embodiments (e.g., the first sequence or the base sequence corresponding to the first sequence) can be Manchester encoded.

[0296] It is mentioned above that, in some implementations, the first PPDU can include a wideband part (e.g., the first PPDU is a downlink PPDU, and the first PPDU includes a wideband part and a narrowband part). In some implementations, the wideband part can include one or more of the following fields: L-STF, L-LTF, L-SIG, BPSK-Mark (the BPSK-Mark can include BPSK-Mark1 and BPSK-Mark2).

[0297] It is mentioned above that, in some implementations, the first PPDU can include a narrowband part, and the narrowband part includes a synchronization field. In some implementations, in addition to the synchronization field, the first PPDU can further include a SIG field and a data field. Alternatively, the first PPDU can include a data field, but not a SIG field. If the sequence in the synchronization field of the first PPDU corresponds to a certain transmission parameter (i.e., the sequence in the synchronization field implicitly indicates a certain transmission parameter), and the first PPDU includes a SIG field, the SIG field can carry other transmission parameters in addition to the transmission parameter already indicated in the synchronization field. Taking the PPDU received or transmitted by the AMP device as an example, the SIG field can be referred to as an AMP-SIG field. In some implementations, the data field of the first PPDU is Manchester encoded.

[0298] Taking the first PPDU used for the communication of an AMP device (which can be an AMP device communicating based on backscatter communication mode, or an AMP device communicating based on non-backscatter mode (such as active transmission communication mode)) as an example, the first PPDU can adopt a structure as shown in FIG. 9A, for example. As can be seen from FIG. 9A, the structure of the first PPDU is similar to the PPDU structure of 802.11ba. The first PPDU includes a wideband part (the bandwidth of the wideband part can be 20 MHz). The wideband part includes fields such as L-STF, L-LTF, L-SIG, BPSK Mark (including BPSK Mark1 and BPSK Mark2), etc. The wideband part is mainly used for compatibility with other conventional wifi devices. In addition to the wideband part, the first PPDU also includes a narrowband part (the bandwidth of the narrowband part can be 4 MHZ). The narrowband part includes AMP-Sync, AMP-SIG, and a data part. The AMP-Sync can be used for synchronization of the AMP device, the AMP-SIG can carry information of part of the physical layer parameters, and the data part is used for data transmission of the AMP. Of course, the PPDU structure given in FIG. 9A is only an example of the PPDU structure used by the AMP device. The AMP device can also use other PPDU structures, such as a PPDU structure including only a narrowband part. In addition to including the AMP-Sync, the PPDU can also include the AMP-SIG and / or the data part, for example.

[0299] In some implementations of the first sequence, the first sequence can include a first sub-sequence. The first sub-sequence can be used to identify the starting position of the first sequence. The first sub-sequence can be located at the front end of the first sequence, for example. By setting the first sub-sequence in the first sequence, the second device can more accurately identify the time domain position of the first sequence, thereby reducing the false alarm probability generated by correlating the other domains of the first PPDU with the local code. The second device can start the correlation operation after identifying the first sub-sequence. Alternatively, the second device can determine which correlation peak is the correlation peak for synchronization according to the identified first sub-sequence.

[0300] In some implementations of the first sequence, the first sequence can include a first sub-sequence, and the first sub-sequence can include consecutive r zeros or consecutive r ones, where r is a positive integer greater than or equal to 1. For example, r is a positive integer greater than or equal to 2, or r is a positive integer greater than or equal to 3. For example, r can be 2, 3, 4, or other values. For example, if the first sequence is set to '0001110101101100', the second device can know that the first sequence has been detected by identifying the first sub-sequence {000} at the front end of the first sequence. For example, if the first sequence is set to '1110001010010011', the second device can know that the first sequence has been detected by identifying the first sub-sequence {111} at the front end of the first sequence.

[0301] In some implementations of the first sequence, the first sequence can include a first sub-sequence, and the first sub-sequence is an all-zero sequence or an all-one sequence, and the duration of the first sub-sequence is greater than or equal to w microseconds, where w is a positive integer greater than or equal to 1. For example, w is greater than or equal to 6 microseconds, and / or w is less than or equal to 9. The second device can accurately determine the starting position of the first sequence by identifying the all-zero sequence or the all-one sequence with a duration greater than or equal to w microseconds at the front end of the first sequence. By setting the first sub-sequence in the first sequence, the second device can more accurately identify the time domain position of the first sequence, thereby reducing the false alarm probability of correlating other domains of the first PPDU with the local code. The second device can start the correlation operation after identifying the first sub-sequence. Alternatively, the second device can determine which correlation peak is the correlation peak for synchronization according to the identified first sub-sequence.

[0302] For example, the first sub-sequence is consecutive zeros, and the duration of the first sub-sequence is greater than the time length corresponding to 2 chips in the data part (as mentioned above, w is equal to the time length corresponding to 2 chips in the data part), or the duration of the first sub-sequence is greater than or equal to the time length corresponding to 3 chips in the data part (as mentioned above, w is equal to the time length corresponding to 3 chips in the data part). In this way, the first sub-sequence can be well distinguished from the data part, so that the second device will not mistakenly detect the data part as the first sequence.

[0303] The above implementations of the first sub-sequence will be described in more detail below.

[0304] When the second device detects the first PPDU, even if the second device starts to attempt synchronization detection in the middle part of the first PPDU, when the data part of the first PPDU is received, since the data part adopts Manchester coding, it contains at most two consecutive 0s or two consecutive Is, thus as long as the number of consecutive 0s (or consecutive Is) in the first sub-sequence or the duration of the first sub-sequence can be distinguished from the Manchester-coded data of the data part, the data part of the first PPDU can be distinguished from the first sub-sequence, thus the second device will not mistakenly detect the data part as the first sequence.

[0305] In addition, since the data frame of WiFi of the OFDM waveform or the data frame of WiFi of the DSSS waveform will not have a continuous signal interruption, when the first sub-sequence is consecutive r 0s, a signal interruption is formed after the wideband part of the first PPDU (see FIG. 13, it should be understood that FIG. 13 is merely an example, the energy of the wideband part and the narrowband part can be the same or different), thus forming a time-domain signal feature different from the WiFi signal, so the first PPDU can be distinguished from other WiFi frames through the first sub-sequence.

[0306] As a specific example, when the chip width of the Manchester-coded data part is consistent with the chip width of the first sub-sequence, if r is greater than or equal to 3 (i.e., the first sub-sequence contains three consecutive chips with a value of 0), the first sub-sequence can be well distinguished from the data part, thus the second device will not mistakenly detect the data part as the first sequence.

[0307] However, it should be noted that the r value or w value mentioned above should not be too large, otherwise the first PPDU will contain a too long zero-power transmission time, thus causing the channel to be judged as idle by other WiFi devices, and further causing other WiFi devices to preempt the channel.

[0308] Of course, in addition to the all-0 sequence or the all-1 sequence mentioned above, the first sub-sequence can also adopt other forms of predefined sequences, such as a sequence composed of consecutive multiple 01 or 10 groups.

[0309] In some implementations of the first sequence, the first sequence can include a second sub-sequence. The second sub-sequence can be used to identify the end position of the first sequence. The second sub-sequence can be located at the last end of the first sequence, for example. By setting the second sub-sequence in the first sequence, the second device can more accurately identify the correlation peak generated by the first sequence, thus reducing the false alarm probability of other domains of the first PPDU and the local code being correlated. The second device can end the correlation operation after identifying the second sub-sequence. Alternatively, the second device can determine which correlation peak is the correlation peak for synchronization according to the identified second sub-sequence.

[0310] In some implementations of the first sequence, the first sequence can include a second sub-sequence, and the second sub-sequence can include b consecutive 0s or b consecutive Is, b being a positive integer greater than or equal to 1. For example, b can be a positive integer greater than or equal to 2, or b can be a positive integer greater than or equal to 3. For example, b can be 2, 3, 4, or other values. For example, if the first sequence is set to '0011010110111000', the second device can recognize the second sub-sequence {000} at the end of the first sequence to know that the detection of the first sequence has ended. For example, if the first sequence is set to '0011001001010111', the second device can recognize the second sub-sequence {111} at the end of the first sequence to know that the detection of the first sequence has ended. By setting the second sub-sequence in the first sequence, the second device can more accurately identify the correlation peak generated by the first sequence, thereby reducing the false alarm probability generated by correlating other fields of the first PPDU with the local code. The second device can end the correlation operation after recognizing the second sub-sequence. Alternatively, the second device can determine which correlation peak is the correlation peak for synchronization according to the recognized second sub-sequence.

[0311] In some implementations of the first sequence, the first sequence can include a second sub-sequence, and the second sub-sequence can be an all-0 sequence or an all-1 sequence, and the duration of the second sub-sequence can be greater than or equal to q microseconds, q being a positive integer greater than or equal to 1. For example, q can be less than or equal to 9. The second device can accurately determine the end position of the first sequence by recognizing the all-0 sequence or the all-1 sequence with a duration greater than or equal to q microseconds at the end of the first sequence. By setting the second sub-sequence in the first sequence, the second device can more accurately identify the correlation peak generated by the first sequence, thereby reducing the false alarm probability generated by correlating other fields of the first PPDU with the local code. The second device can end the correlation operation after recognizing the second sub-sequence. Alternatively, the second device can determine which correlation peak is the correlation peak for synchronization according to the recognized second sub-sequence.

[0312] As described above, since the data part adopts Manchester coding, it at most contains two consecutive 0s or two consecutive Is, and therefore, as long as the number of bits contained in the second sub-sequence (including consecutive 0s or consecutive Is) or the duration of the second sub-sequence can be distinguished from the Manchester-coded data of the data part, the data part of the first PPDU can be distinguished from the first sequence, so that the second device will not mistakenly detect the data part as the first sequence.

[0313] For example, the second sub-sequence is a sequence of consecutive 0s or a sequence of consecutive Is, and the duration of the second sub-sequence is greater than the time duration corresponding to 2 chips in the data portion (q is equal to the time duration corresponding to 2 chips in the data portion as mentioned above), or the duration of the second sub-sequence is greater than or equal to the time duration corresponding to 3 chips in the data portion (q is equal to the time duration corresponding to 3 chips in the data portion as mentioned above). In this way, the second sub-sequence can be well distinguished from the data portion, so that the second device will not mistakenly detect the data portion as the first sequence.

[0314] As a specific example, when the chip width of the Manchester code of the data portion is consistent with the chip width of the first sub-sequence, if b is greater than or equal to 3 (i.e., the first sub-sequence contains 3 consecutive chips with a value of 0), the second sub-sequence can be well distinguished from the data portion, so that the second device will not mistakenly detect the data portion as the first sequence.

[0315] Of course, in addition to the all-0 sequence or the all-1 sequence mentioned above, the second sub-sequence can also adopt other forms of predefined sequences, such as a sequence composed of a plurality of consecutive 01 or 10 groups.

[0316] The autocorrelation of the first sequence (or the correlation of the first sequence with the local code corresponding to the second sequence mentioned above) is described in detail above in combination with specific examples. In addition to the autocorrelation of the first sequence, in some implementations, in order to improve the sequence performance of the first sequence, the cross-correlation of the first sequence with the data signal (signal in the data field) in the narrowband portion of the first PPDU can also be considered, so as to avoid false alarm (i.e., mistakenly detecting the data signal as the synchronization signal) of the data signal to the first sequence (or the synchronization signal in the synchronization field).

[0317] As mentioned above, in order to detect the first sequence, the correlation of the first sequence and the local code is determined. In order to successfully implement the detection of the first sequence, it is usually required that the correlation parameter value (such as the correlation peak-peak value) of the first sequence and the local code is as large as possible. Similarly, in order to avoid false alarm of the data signal to the first sequence, it is necessary to try to ensure that the cross-correlation parameter value (such as the correlation peak-peak value) of the first sequence (or the local code) and the data signal is as low as possible.

[0318] A bit of the first sequence corresponds to a certain duration. The duration can also be referred to as a chip duration of the first sequence. For ease of description, the duration is referred to as a second duration hereinafter. A data signal in the data field is associated with one or more data symbols. In other words, the data signal generates one or more data symbols after being encoded (the data signal is usually encoded by Manchester encoding). The duration of the data symbol associated with the data signal is related to the transmission rate of the data signal. For example, assuming that the transmission rate of the data signal is 250 kbps, the duration of the data symbol formed after the data signal is Manchester encoded is 2 microseconds. For another example, assuming that the transmission rate of the data signal is 1 Mbps, the duration of the data symbol formed after the data signal is Manchester encoded is 0.5 microseconds. In some embodiments, the second duration can be equal to the duration of the data symbol, thereby simplifying the design complexity of the PPDU.

[0319] Alternatively, in other embodiments, in order to reduce the false alarm of the data signal to the first sequence, the second duration can not be equal to the duration of the data symbol. Moreover, the greater the difference between the second duration and the duration of the data symbol, the smaller the probability of the false alarm of the data signal to the first sequence can be. The reasons behind this phenomenon are explained by way of example as follows.

[0320] For example, when the second duration is greater than the duration of the data symbol and the second duration is 4 times the duration of the data symbol, the second duration corresponds to 4 data symbols. At this time, the following situations can exist: the 4 data symbols contain 1 one and 3 zeros, the 4 data symbols contain 2 ones and 2 zeros, and the 4 data symbols contain 3 ones and 1 zero. A bit of the first sequence corresponding to the 4 data symbols can be 1 or -1. In summary, for a bit of the first sequence, the correlation result (referred to as correlation result 1) of the data symbol and the first sequence (or local code) can be 1, 2, 3, -1, -2, -3, a total of six values. Assuming that the length of the first sequence is 32, the correlation result of the data symbol and the first sequence (or local code) is the sum of 32 correlation results 1, and each of the 32 correlation results 1 can be one of the above 6 values. Since the correlation result of the data symbol and the first sequence has fewer possibilities, in this case, a specific first sequence can be easily found, such that in the above various situations, the correlation result (correlation peak value) of the first sequence (or local code) and the data symbol is relatively low, thereby the false alarm of the data signal to the synchronization signal can be easily avoided.

[0321] For example, when the second time length is less than the duration of the data symbol, and the second time length divided by the duration of the data symbol is 0.25, 4 bits in the first sequence correspond to 1 data symbol. Assuming the length of the first sequence is 32, 32 bits correspond to 8 data symbols. Since the data symbol is generally Manchester coded, the number of types of data signals formed by 8 data symbols is less than 2 8 . Similarly, since the number of types of data symbols is less, in this case, a specific first sequence can be easily found, so that the correlation results (correlation peak values) of the first sequence (or local code) and the data symbols are relatively low, so that false alarms caused by the data signal to the synchronization signal can be easily avoided.

[0322] For example, when the second time length is equal to the duration of the data symbol, the number of types of data symbols is relatively large relative to the first sequence, and it is relatively difficult to find a sequence that can make the correlation results of all data symbols and the first sequence (or local code) relatively low.

[0323] According to the above description, the greater the difference between the second time length and the duration of the data symbol, the easier it is to find a first sequence that has relatively low correlation with various types of data domain signals, thereby reducing the probability of false alarms caused by the data signal to the synchronization signal.

[0324] Therefore, in order to reduce the probability of false alarms caused by the data signal to the first sequence, in some implementations, the second time length and the duration of the data symbol can be set to be unequal. For example, the ratio of the larger value to the smaller value in the second time length and the duration of the data symbol is greater than or equal to 2, such as 2, 4 or 8. Alternatively, the second time length can be other values greater than or equal to 1 / m (m represents the sampling rate).

[0325] The foregoing mentioned that the data signal can have multiple transmission rates, and the durations of the data symbols associated with different transmission rates of the data signal are different. In some embodiments, when the transmission rates of the data signals are different, the second time length corresponding to one bit in the first sequence can remain unchanged. That is, the second time length corresponding to one bit in the first sequence can not change with the change of the transmission rate of the data signal, thereby simplifying the implementation of the PPDU and facilitating the reception of the PPDU. Alternatively, in other embodiments, when the transmission rates of the data signals are different, the second time length corresponding to one bit in the first sequence can be different. That is, the second time length corresponding to one bit in the first sequence can change with the change of the transmission rate of the data signal.

[0326] The following gives several possible implementations.

[0327] Implementation one: different second time lengths correspond to data signals with different transmission rates, and the second time length is equal to the duration of the data symbol

[0328] For example, when the transmission rate of the data signal is 250 kbps, the duration of the data symbol is 2 microseconds, and the second duration is 2 microseconds; and / or, when the transmission rate of the data signal is 1 Mbps, the duration of the data symbol is 0.5 microseconds, and the second duration is 0.5 microseconds.

[0329] The implementation manner one has the advantage that the duration corresponding to one bit in the first sequence and the data symbol in the first PPDU remains equal, which is simple to implement.

[0330] Implementation manner two: the data signals of multiple transmission rates correspond to different second durations, and the second durations are not equal to the duration of the data symbol

[0331] For example, when the transmission rate of the data signal is 250 kbps, the duration of the data symbol is 2 microseconds, and the second duration is a first value; and / or, when the transmission rate of the data signal is 1 Mbps, the duration of the data symbol is 0.5 microseconds, and the second duration is a second value; wherein the first value is not equal to 2 microseconds, the second value is not equal to 0.5 microseconds, and the first value is not equal to the second value.

[0332] Optionally, the first value is 1 microsecond, 0.5 microsecond, 0.25 microsecond or 0.125 microsecond; and / or, the second value is 2 microseconds, 1 microsecond, 0.25 microsecond or 0.125 microsecond (note that in the implementation manner two, although the first value or the second value can be 1 microsecond, 0.25 microsecond or 0.125 microsecond, the second value is not equal to the first value when being 1 microsecond, 0.25 microsecond or 0.125 microsecond).

[0333] As an example, the second duration corresponding to the data signal of 250 kbps is 0.5 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 2 microseconds.

[0334] As another example, the second duration corresponding to the data signal of 250 kbps is 0.25 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 2 microseconds.

[0335] As yet another example, the second duration corresponding to the data signal of 250 kbps is 0.125 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 2 microseconds.

[0336] As yet another example, the second duration corresponding to the data signal of 250 kbps is 0.125 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 0.25 microsecond.

[0337] As yet another example, the second duration corresponding to the data signal of 250 kbps is 0.125 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 1 microsecond.

[0338] The implementation manner two has the advantages that: since the data signals of the multiple transmission rates correspond to different second time lengths, and the second time length and the duration of the data symbol are not equal, the second time length is not constrained by the transmission rate of the data signal, nor by the duration of the data symbol, and the second time length has a relatively large degree of freedom, and it is easier to ensure that the difference between the second time length and the duration of the data symbol is relatively large under different transmission rates.

[0339] The implementation manner three: the data signals of the multiple transmission rates correspond to the same second time length, and the second time length is equal to the duration of the data symbol corresponding to the first transmission rate in the multiple transmission rates

[0340] For example, the first transmission rate is the highest transmission rate in the multiple transmission rates. Illustratively, the data signal includes multiple transmission rates, and the multiple transmission rates include 250 kbps and 1 Mbps, and in this case, the first transmission rate mentioned above can be 1 Mbps. Since the duration of the data symbol corresponding to the transmission rate of 1 Mbps is 0.5 microseconds, the second time length is 0.5 microseconds at this time.

[0341] For another example, the first transmission rate is the lowest transmission rate in the multiple transmission rates. Illustratively, the data signal includes multiple transmission rates, and the multiple transmission rates include 250 kbps and 1 Mbps, and in this case, the first transmission rate mentioned above can be 250 kbps. Since the duration of the data symbol corresponding to the transmission rate of 250 kbps is 2 microseconds, the second time length is 2 microseconds at this time.

[0342] The implementation manner three has the advantages that: since the second time length is always equal to the duration of the data symbol corresponding to a certain transmission rate, it is relatively simple to implement. In addition, although the second time length and the duration of the data symbol are equal when the transmission rate of the data signal is the maximum or minimum transmission rate, at this time, the probability of false alarm of the first sequence caused by the data signal increases, but under other transmission rates, the second time length and the duration of the data symbol are different (even have a large difference), so that the probability of false alarm of the first sequence caused by the data signal can be reduced. In actual use, a suitable transmission rate can be selected to transmit the data signal according to the requirement of the system on the false alarm rate.

[0343] The implementation manner four: the data signals of the multiple transmission rates correspond to the same second time length, and the second time length and the duration of the data symbol are not equal

[0344] When the transmission rate of the data signal is 250 kbps, the duration of the data symbol is 2 microseconds. When the transmission rate of the data signal is 1 Mbps, the duration of the data symbol is 0.5 microseconds. Therefore, in the fourth implementation, the second duration can be fixedly set as any value other than 0.5 microseconds and 2 microseconds, such as 1 microsecond, 0.25 microseconds or 0.125 microseconds.

[0345] For example, the second duration corresponding to the data signal of 250 kbps is 1 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 1 microsecond.

[0346] For example, the second duration corresponding to the data signal of 250 kbps is 0.25 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 0.25 microsecond.

[0347] For example, the second duration corresponding to the data signal of 250 kbps is 0.125 microsecond, and the second duration corresponding to the data signal of 1 Mbps is 0.125 microsecond.

[0348] The fourth implementation has the advantages that the second duration is relatively fixed and does not change with the transmission rate of the data signal, and is relatively simple to implement. In addition, the second duration is not equal to the duration of the data symbol, i.e., the second duration and the duration of the data symbol always have a difference, so that the probability of false alarm of the data signal to the first sequence can be reduced.

[0349] In the following, some possible implementations of the first sequence (or the base sequence corresponding to the first sequence) are given in combination with specific examples.

[0350] In some implementations, the first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences:

[0351] 10000001011011110010101010101101；10101000000011010101101110110101；10101011011110110100000010101001；10110101100000001101011011010101；10110110101101010100000001110101；10111110010100000101010010101101；11010110110000000101101011010101；10010010111111001010000101010101；10100000001011101011011010110101；10111010101100000001101011010101；01010110101010101011000000110111；01111010000110101001010100110101；01000001101011110010101101010101；01000101001011111101001010010101；01010110110110101000000111010101；10010100111110101010000101011010；10101000101111010101000011010110；10101101011010110110100000001101；10110101010101101000000011011101；11011101010110101010100000001011；11110101000000101011011010010101；11110110101011000010101010000101；00000010110110101010110111011010；00001010101101111101001010011010；00001010101111011001001011010101；00001010110101111101001010011010；00001011011111001010010101010110；00001101011001111101010100101010；00001101011111010101010010100110；00010101011110110101100101010100。

[0352] It should be noted that the above sequence is a sequence selected from a plurality of sequences by calculating the autocorrelation (or correlation between the sequence and the local code) of the plurality of sequences and the cross-correlation with the data signal, in the case that the second duration corresponding to the data symbol of 250 kbps is 1 microsecond and the second duration corresponding to the data symbol of 1 Mbps is also 1 microsecond. The autocorrelation of these sequences is high, and the cross-correlation of these sequences with the data signal is low, so as to effectively reduce the probability that the data signal generates false alarm to the sequence in the synchronization domain. That is, in the case that the second duration corresponding to the data symbol of 250 kbps is 1 microsecond and the second duration corresponding to the data symbol of 1 Mbps is also 1 microsecond, the sequence performance of the above sequence is good (the correlation peak of the autocorrelation is high, and the correlation peak of the cross-correlation with the data signal is low), but the above sequence can also be applied to other scenarios with different second duration values.

[0353] Exemplarily, in the case that the second duration corresponding to the data symbol of 250 kbps is 1 microsecond and the second duration corresponding to the data symbol of 1 Mbps is also 1 microsecond, when the transmission rate of the data symbol associated with the data domain of the first PPDU is 250 kbps, the sequence in the synchronization domain uses one of the above sequences [G]; when the transmission rate of the data symbol associated with the data domain of the first PPDU is 1 Mbps, the sequence in the synchronization domain uses the complementary sequence of sequence [G] Or, in the case that the second duration corresponding to the data symbol of 250 kbps is 1 microsecond and the second duration corresponding to the data symbol of 1 Mbps is also 1 microsecond, when the transmission rate of the data symbol associated with the data domain of the first PPDU is 250 kbps, the sequence in the synchronization domain uses the complementary sequence of one of the above sequences [G] When the transmission rate of the data symbol associated with the data domain of the first PPDU is 1 Mbps, the sequence in the synchronization domain uses [G].

[0354] In some embodiments, the first sequence or the base sequence corresponding to the first sequence satisfies one or more of the following:

[0355] The first sequence or the base sequence corresponding to the first sequence is an m-sequence or a gold sequence;

[0356] The length of the first sequence or the base sequence corresponding to the first sequence is 127 or 255.

[0357] For example, the first sequence or the base sequence corresponding to the first sequence is an m-sequence with a length of 127 or a gold sequence generated based on the m-sequence with a length of 127, and the m-sequence can include one or more of the following sequences:

[0358] 1000000100000110000101000111100100010110011101010011111010000111000100100110110101101111011000110100101110111001100101010111111；

[0359] 1000000100010011000101110101101100000110011010100111001111011010000101010111110100101000110111000111111100001110111100101100100；

[0360] 1000000100011111010011010001011110110111011111110000101011000100111100101001001011010101000001100100001110101110011100011011001；

[0361] 1000000100100110100111101110000111111100011101100010100101111101010100001011011110011100101011001100000110110101110100011001000；

[0362] 1000000100111111100010101011110011001010001000110000111101111101011010100110110011101101110100100101100011100100001011100000110；

[0363] 1000000101011011111110011011010101000100100110011110001110111010111101001011001010011100100011000101110000100001101000001111101；

[0364] 1000000101000011011001000001111000101101011000010001001110111101000110011010011000111001010101110101001001011111110011111011011；

[0365] 1000000101100000111010000100111000110100100101110110111001101100101011010111110111100001100010001010011001111010101000111111100；

[0366] 1000000101101100010100000111011010011110000100110111010001000110101100111001100101111010100101010111000111110111111100100100001；

[0367] 1000000111111101010100110011101110100101100011011110110101101100100100011100001011111001010111001101000100111100010100001100000；

[0368] 1000000111101100110001001001110011111001000001000110101010011011010010100001011000011001011111110101101110111100011101000101011；

[0369] 1000000111010100010111000111101110110101111111010011000011010000101001011011001010101100010000010011111001110010010001100110111；

[0370] 1000000111011011111001111111010010010101110101010011100011001011001100010111101110010001000011010110100011110000010011011000010;

[0371] 1000000110111110000010110000100001110100011000100111001010011010010111101011101110001111001100100100010101011011001111111011010;

[0372] 1000000110101110100101010110111001000010001001001111010100000101111001110111111101100101100011001101101000111110000111000101001;

[0373] 1000000110011011000111001110101110000100110000010101011010010010100111100100011010100001111111011101101111010001011001011111000;

[0374] 1000000110010100011100001111100010110110011000110100110111111101110011110100000101011110010010001000010011101101010100101110101;

[0375] 1000000110000100100111111101111100011101010100101011110100110011100110101100010001011101100100001111001011011100000101000110110.

[0376] For example, the base sequence corresponding to the first sequence or the first pair of sequences is a length-255 m-sequence or a gold sequence generated based on a length-255 m-sequence, which can include one or more of the following sequences:

[0377] 100000001000111000100101110000001100100100110111001000001010110110101100101100001111101101111010111010001000011011000111100111001100010110100100010100101010011101110110011110111111010011001101010001100000111010101011111001010000100111111110000101111000110；

[0378] 100000001001011111111000110101010111101100110010100100010001100011110000100001010000011111001111110101000101010011000011001110111110111010010101101001110011011000101110110111100101101101011100100100110100011100010011110100001110101100000101100100000011011；

[0379] 100000001001010011111111000110001010101000010000110011000001111101110111111010100101101010110011100100110010001011100010001111001011110000101000110101111100111101100101011101011011100110100110110100010011101101100001110100100100000101100011100000011011110；

[0380] 100000001010110001100111000000111110100101010010000010000111011111101100001100010011000001101000101001101010000101110011110101111100011100101000111100001001001011110010001000110110111000101100110010110110010011101010101110110101101001111111100110111101110；

[0381] 100000001010010101010001011101110101110010011101100001011000111111011010110011011011100001110001101010011111000100001100101000000111101111111100111001100111100101101001101000111010010000011011110101011011001000100100101111101000010011000101011110000010001；

[0382] 100000001011100011101111000101100110110000111100111000010101111111100101111010010100001101110110111110101110100000110010101010001101011000110000010010110110101001101001111110111001100111101100100001000000111001001001100010011101010110100010001010010001111；

[0383] 100000001011101111011001111111100101101011011101010101110010011011010011001101000111011011000100010011110100100100001111000101001110001111101011110011101000010101100101000101100000110010001100001101111110111000010000010010101001011111000000111001100011010；

[0384] 100000001011110110000001110001101000001001001011100001101101110010001011011001011001110110101110101001101111001111101011000101000011110100111100010001110100010011001001110011010101101001010111111011101111100000110011000010000101010100011000111111110010100；

[0385] 100000001011000111101000011111111001000010100111110101010111000001100010101100110010111111011110011011101110010101001010001001011010001100111001111000110110000100010111010111101101111100001101001101011011010100000100111011001001001100000011101001000111000；

[0386] 100000001111110010100101101011111000101100100001010001001001010101001100101110100011101100111110110100000010000010111101110111100001001110101100011110011011011111111010101110011100100110101000011011100000110000111000110011000100011010011110100100010101101；

[0387] 100000001111100010010100010001011010101110010001100100100111000000100001001101111001100111011111100101100101011011010010000011000110101100010101010011000001011101011111011011101100001010010111101001111111101010000111001111000011011001101000111101110001110；

[0388] 100000001110110000001001101000001101011100001011110010001110001011001001001110101101101001111011011101000110110011100101101010010111011111011100110000110010101000101011111100111110000010100001000011110001100010001001010011001101111010101011000111111110100；

[0389] 100000001101101010001001011110010110001000110011000111000011000001110110000101011001001110011101010111111110110110011110001101011100100001111011101111010000010000001011011111001101110001011101001100101010100100100010100001001101000111110101101001010011111；

[0390] 100000001101110100100011111100000111010100110101100001100011010000111100011100111101110010011001101101111001010111011111111011010011100001010100000010110011101100100000100001001111101011110100010100101110001000100100101000110010110101010110110001011111001；

[0391] 100000001100111110100011011010101011010011000101001001000100011101001010001011110101111100100001000001001101110011010000001010100001110010110111111110111010100111101101100110010011101111001110001111000010110001100001101011001010111000001111110001001011101；

[0392] 100000001100010000011110101000110010000101111101001001000100110110101011110110000010010111000101100101101001111001100111001111111101111000000101001100001000111110010101100011100001110110110011010110111111000110100001101110010011101011101110100010101010010.

[0393] It should be noted that the m sequence mentioned above with a length of 127 or 255 is a sequence selected from a plurality of sequences by calculating the autocorrelation of the plurality of sequences (or the correlation of the sequence and the local code) and the cross-correlation of the sequence and the data signal, in the case that the second duration corresponding to the data symbol is 0.25 microseconds or 0.125 microseconds at 250 kbps, and the second duration corresponding to the data symbol is also 0.25 microseconds or 0.125 microseconds at 1 Mbps. The cross-correlation of the sequence and the data signal is low, which can effectively reduce the probability of false alarm of the data signal to the sequence in the synchronization domain. That is, in the case that the second duration corresponding to the data symbol is 0.25 microseconds or 0.125 microseconds at 250 kbps, and the second duration corresponding to the data symbol is also 0.25 microseconds or 0.125 microseconds at 1 Mbps, the sequence performance of the above sequence is good (the correlation peak of the autocorrelation is high, and the correlation peak of the cross-correlation with the data signal is low), but the above sequence can also be applied to other scenarios with different second duration values.

[0394] Exemplarily, in the case that the second duration corresponding to the data symbol is 0.25 microseconds or 0.125 microseconds at 250 kbps, and the second duration corresponding to the data symbol is also 0.25 microseconds or 0.125 microseconds at 1 Mbps, when the transmission rate of the data symbol associated with the data domain of the first PPDU is 250 kbps, the sequence in the synchronization domain uses one of the above sequences [G]; when the transmission rate of the data symbol associated with the data domain of the first PPDU is 1 Mbps, the sequence in the synchronization domain uses the complementary sequence of sequence [G] Or, in the case that the second duration corresponding to the data symbol of 250kbps is 0.25 microseconds or 0.125 microseconds, and the second duration corresponding to the data symbol of 1Mbps is also 0.25 microseconds or 0.125 microseconds, when the transmission rate of the data symbol associated with the data field of the first PPDU is 250kbps, the sequence in the synchronization field uses the complementary sequence of one of the sequences [G] described above When the transmission rate of the data symbol associated with the data field of the first PPDU is 1Mbps, the sequence in the synchronization field uses [G].

[0395] The cost of the second device (such as an AMP STA) is different, and the type of receiver used by the second device may be different. The functions and / or receiving capabilities of different types of receivers may differ. Therefore, for the synchronization field of the first PPDU, a sequence can be designed that can be applied to multiple types of receivers at the same time, so that when multiple types of receivers use the sequence for synchronization, they all have good synchronization performance.

[0396] For example, the receiver used by the second device (such as an AMP STA) can be one of a first type of receiver and a second type of receiver. The first type of receiver can be a receiver that meets one or more of the following conditions: the first type of receiver has automatic gain control (AGC) and / or analog-to-digital conversion (ADC) functions, and the first type of receiver does not detect the sequence in the synchronization field based on the decoding result of the sequence in the synchronization field. For example, the first type of receiver can be a powerful receiver (or an AMP STA), so the first type of receiver can quantize the sequence in the synchronization field, and then can directly perform correlation operations based on the quantization structure.

[0397] The second type of receiver (a possible structure of the second type of receiver is shown in FIG. 15) can be a receiver that meets one or more of the following conditions: the second type of receiver does not have ACG and / or ADC functions, and the second type of receiver detects the sequence in the synchronization field based on the decoding result of the sequence in the synchronization field. For example, compared to the first type of receiver, the second type of receiver is less powerful and needs to first decode the sequence in the synchronization field and then perform correlation operations on the decoding result.

[0398] The decoding manner of the second type of receiver can include Manchester decoding, for example. That is, the second type of receiver can decode '10' of the first sequence as 0 and '01' as 1. Alternatively, the second type of receiver can decode '01' of the sequence in the synchronization field as 0 and '10' as 1. In addition, if the sequence in the synchronization field includes '00' or '11', the second type of receiver can decode it as x (representing unknown). Taking the first sequence as '1010000101' as an example, the decoded result is '00x11' or '11x00'.

[0399] Alternatively, the decoding manner of the second type of receiver can be based on level transition of the sequence in the synchronization field. For example, 1 in the first sequence represents high level and 0 represents low level, if the high level jumps to the low level, the jump is decoded as 1, if the low level jumps to the high level, the jump is decoded as 0, and if the high level jumps to the high level or the low level jumps to the low level, the two jumps can be decoded as x. Alternatively, if the high level jumps to the low level, the jump is decoded as 0, if the low level jumps to the high level, the jump is decoded as 1, and if the high level jumps to the high level or the low level jumps to the low level, the two jumps can be decoded as x (representing unknown). Taking the first sequence as '1010000101' as an example, the decoded result is '010xxx101' or '101xxx010'.

[0400] In some embodiments, the first sequence or the base sequence corresponding to the first sequence can include a sequence suitable for both the first type of receiver and the second type of receiver. That is, the receiver in the second device, whether it is the first type of receiver or the second type of receiver, can achieve good synchronization performance based on the sequence. In order to enable the sequence to provide good synchronization performance under both types of receiver architectures, the sequence can meet the correlation requirements mentioned in one or more of the foregoing examples one to six on the one hand, thereby meeting the synchronization requirements of the first type of receiver, and on the other hand, the sequence can still meet good correlation after being decoded by the second type of receiver, thereby meeting the synchronization requirements of the second type of receiver.

[0401] For example, the length of the first sequence or the base sequence corresponding to the first sequence is 24; and / or, the first sequence or the base sequence corresponding to the first sequence comprises 12 '01' and / or '10' that are not overlapped; and / or, the first sequence or the base sequence corresponding to the first sequence comprises 12 '01' and / or '10' that are not overlapped and are in transition. The first sequence or the first sequence contains more '01' and / or '10' transitions, so as to facilitate the identification of the sequence by using the transition of the signal amplitude. In addition, the first sequence can be: the sequence with good correlation characteristics is selected according to the correlation characteristics of the first sequence itself in at least one of the aforementioned examples 1 to 6, so as to well meet the synchronization requirements of the first type of receiver. Further, the first sequence also satisfies: if the correlation characteristics of the decoded sequence of the first sequence are measured according to at least one of the aforementioned examples 1 to 6, the decoded sequence also has good correlation characteristics. Based on the above considerations, the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0402] [011001011001010101101010]，[100110011001011010010101]，[100110100110101010010101]，[100110011010010110010101]，[010101010110100101100110]，[100110011010010110101010]，[010101011001100110100101]，[100110011010011010010101]，[010101011001101001011010]，[100110011010100101011001]，[010101011010010110100110]，[100110100110011001010110]，[010101100101011001101001]，[100110101001010110011001]，[010101100110011010011010]，[100110101001101010100101]，[010101101010011010011001]，[100110101010100101011001]，[010101101010100110100110]，[100110101010100101101001]，[010110010110010101101010]，[101001010101011001100101]，[010110010110011001101010]，[101001010110010110011010]，[010110011010101001011010]，[101001010110011001100101]，[010110100101010101100110]，[101001010110011010011010]，[010110100101010110011010]，[101001011001100101010101]，[010110100101100110101010]，[101001011001100110010101]，[010110100110011001100101]，[101001011001100110101010]，[011001010110101010100110]，[101001100110010110101010]，[011001011001010110101001]，[101001100110101010100101]，[011001011010010110101010]，[101001101001010110011001]，[011001100101011010011010]，[101001101010010101100110]，[011001100101101010101001]，[101010100101101001100110]，[011001100110101010010110]，[101010100110011010010110]，[011001101001011010101010]，[101010101001011001100101]，[011001101010100101101001]，[010101010110011001011010]，[011001101010101001011010]，[010101011001010110011010]，[011010010101010101100110]，[010101011010011001100101]，[011010010101010110011001]，[010101011010100110100110]，[011010010110011010101001]，[010101100110010110100101]，[011010011001010110010101]，[010101100110011001011010]，[100101100110101001101010]，[010101100110011010010110]，[100101101001100101010110]，[010101101001011001100110]，[100101101010101001100110]，[010101101001101001100110]，[100101101010101010011001]，[010101101010011010011010]，[100110010101010110100101]，[010110010110011010100101]，[100110010101011010010110]，[010110011001011010101010]，[100110010110100101010101]，[010110011001100101011010]，[100110011001010101101001]，[010110011001100110100101]，[100110011010010101010110]，[010110011010100110101010]，[100110011010100101100101]，[010110101010011010100110]，[100110100101101001010101]，[011001010110011001101001]，[100110100110101001010110]，[011001011001010110101010]，[100110101001010101011001]，[011001011010101001100110]，[101001011001100110011010]，[011001100101010101101001]，[101001011010011001010101]，[011001100101010110100110]，[101001011010101001100101]，[011001101001010101010110]，[101001011010101010011001]，[011001101010011010101001]，[101001100101010110100101]，[011001101010101010010110]，[101001101001100110010101]，[011010010101011001100110]，[101001101001101010010101]，[011010010110101010011001]，[101010010101011001011001]，[011010011001101010101001]，[101010010101100101100110]，[011010011010101001010110]，[101010011001100101100101]，[011010100101010110010110]，[101010011010100110010110]，[011010100110011001011001]，[101010100101101001011001]，[011010101001010110010110]，[101010100110010110100101]，[011010101001101010011001]，[101010100110011001011010]，[011010101010010110011001]，[101010101001011010011001]，[011010101010011001101001]，[010101010110100110011010]，[011010101010100101100110]，[010101011001100101101001]，[100101010101011010011001]，[010101011010010110011001]，[100101010101100110010110]，[010110010101101010011001]，[100101010101101001100110]，[010110010110101001100110]，[100101010110010101100110]，[010110011001010101011010]，[100101010110101001101001]，[010110011001101001010101]，[100101011001100110100110]，[010110100110011001010101]，[100101011010101001101001]，[010110100110011001101010]，[100101100101010110101001]，[010110100110011010101010]，[100101100110010101010110]，[010110101001100101100101]，[100101101001010101100110]，[010110101001100110011010]，[100101101010100110011001]，[010110101001101001100101]，[100110010101010101101001]，[010110101010100110011010]，[100110010101100101010110]，[011001010101011010010110]，[100110010110101010101001]，[011001010101011010100110]，[100110011010101001011001]，[011001010110010101011010]，[100110011010101010010110]，[011001010110101001100110]，[100110100101010110011001]，[011001011001100110101001]，[100110100110101001010101]，[011001100101011010100110]，[100110101001100110010110]，[011001100101100101101010]，[101001010101100101011001]，[011001100101101001010101]，[101001100101011001010101]，[011001100101101001101010]，[101001100110011001011010]，[011001100110100101101010]，[101001100110011010100101]，[011001101001101010010101]，[101001100110100101010101]，[011001101010010101100101]，[101001101001100101011010]，[011010010110011001010101]，[101010010101100101100101]，[011010010110011001101010]，[101010010110010110011001]，[011010010110101010100110]，[101010010110100110011001]，[011010011001100101011001]，[101010011001100101101001]，[011010011001100110101001]，[101010011001100110100101]，[011010011010100101010110]，[101010011001101001011010]，[011010100101011001011001]，[101010100101011001011001]，[011010100110011001101001]，[101010100101100110011010]，[011010101001100101101001]，[101010100110101001100101]，[100101010110011010010110]，[101010101001100110100101]，[100101011001100110010110]，[010110100101100110010101]，[100101011010100110100110]，[101001011010011001101010]，[100101100101011010101001]，[010101100101101001100110]，[100101100110011001010110]，[010110011010011010100101]，[100101100110011010100110]，[101001100101100101011010]，[100101101001010101011001]，[101010011010010110011001]，[100101101001100110010101]，[010101100101101010011001]，[100101101001100110101010]，[010101101001011001101010]，[100110010101101010011010]，[010101101001101010011001]，[100110010110010101101010]，[010101101010011001101001]。，

[0403] For example, the length of the first sequence or the base sequence corresponding to the first sequence is 32; and / or, the first sequence or the base sequence corresponding to the first sequence comprises 16 '01' and / or '10' that are not overlapped; and / or, the first sequence or the base sequence corresponding to the first sequence comprises 16 or more '01' and / or '10' that are not overlapped. The first sequence or the first sequence comprises more '01' and / or '10' transitions, so that the sequence can be easily identified by the transition of the signal amplitude. In addition, the first sequence can be: the sequence with good correlation characteristics is selected according to the correlation characteristics of the first sequence itself in at least one of the above-mentioned examples 1 to 6, so that the synchronization requirement of the first type receiver can be well met. Further, the first sequence also satisfies: if the correlation characteristics of the decoded sequence of the first sequence are measured according to at least one of the above-mentioned examples 1 to 6, the decoded sequence also has good correlation characteristics. Based on the above considerations, the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences (or, the first sequence or the base sequence corresponding to the first sequence can form one or more of the following sequences after cyclic shift):

[0404] [01010101101001101001100110011010]，[01101010010101010101100101100110]，[01101001100101010110101001101010]，[01101010100101011001010110010110]，[10010110011010101001010110010101]，[01101010100110011001101001011001]，[10101010010110010110011001100101]，[01101010101001011010010110011001]，[01010110101001101001101001100110]，[10010101010110100101101001100110]，[01100101011001011001101010100101]，[10010101011001100110010110100110]，[01100101100101101001010110101010]，[10010101011010100110101001101001]，[01100110101010100110010110100101]，[10010101101010101010011010011001]，[10011001010101011001101001011010]，[10010110010101100101011010101001]，[10011010011010010110101001010101]，[10010110010110101010011001100110]，[10011010100110100110010101011010]，[10011001011001010101010110101001]，[10101001010110010110010110011001]，[10011001011010010101100110101010]，[01010101011010010110100110011010]，[10011001100101101001010101011001]，[01010101100110101001011010011001]，[10011001100101101001101010101001]，[01010101101001011010011001100101]，[10011001100110100110100101010110]，[01010101101010010110100110100110]，[10011001101001101001101010010101]，[01010110101001100110010110010110]，[10011001101010011010011010010101]，[01010110101001101010011010011001]，[10011010010110011001100101010110]，[01011001100101010101101001011010]，[10011010100101010101100110010110]，[01011001100101010110100110101001]，[10100101010101100101100110011010]，[01011001100110100110101010100101]，[10100101010101101001011001100101]，[01011010010101010101100110011010]，[10100101011001010110010110011010]，[01100101100101011001010110101010]，[10100101011001100110011010011010]，[01100101101010100110011001101001]，[10100101101001100101010101100110]，[01100110100110101001101010010101]，[10100110011001011010010101010110]，[01101001011001100110011010101001]，[10100110011010010110101010100101]，[01101001100110100101101010101001]，[10100110100110011001010110101010]，[01101001100110101001010101010110]，[10101001010110011001100101100101]，[01101001101010100101100110011001]，[10101001011001011001100110011010]，[01101010100110011001100101101001]，[10101001101001010101011001100101]，[01101010101001011010011001100101]，[10101010011001100101101001100101]，[01101010101010010101100110010110]，[01010101011010100101101001100110]，[10010101010101101010011001101001]，[01010101101001011001100110011010]，[10010101010110100101100110011010]，[01010110011001100110100110100101]，[10010101011001100110011010010110]，[01011001011001100110010101101010]，[10010110010101011010011001100110]，[01011001100101010101101001101010]，[10010110011001010110101010101001]，[01011001100101101001011010101010]，[10010110011001011010010101010110]，[01011001100110010101011010011010]，[10010110100110011001100101010110]，[01011001100110010110010110101010]，[10011001011001010110010101101010]，[01011001100110011010101001011010]，[10011010010101011001100110010110]，[01011001100110100101101001010101]，[10011010011010100110101001010101]，[01011010011010100101100110010101]，[10100101101010101010011001100101]，[01100110011001010101101001101001]，[10100110011001011001010101011010]，[01100110011010101010010110100110]，[10100110011010101001011001010110]，[01101001011001100110101010101001]，[10100110011010101010010110100101]，[01101001101001100110010101101010]，[10101001010110010101100101100110]，[01101010011010010101011001100101]，[10101001010110011001101001101001]，[01101010100110100101100110011001]，[10101010010101101001011001011001]，[01101010101010011001100101101001]，[10101010010110100101100110011010]，[10010101010101100110011010010110]，[10101010011001010110100101100110]，[10010101011001011010011001100110]，[10101010100101101001011001100101]，[10010101100101101010100110011010]，[01010101101010011001100101100101]，[10010110010110011001101010010101]，[01010101101010011010100110100110]，[10010110100110011001010101010110]，[01010110010101101010100110010110]，[10011001100101010101101001011001]，[01010110100110100110101001100110]，[10011001100110101010010110010110]，[01011001011001100110011010100101]，[10100101100101011010011001101010]，[01011001100110101010101001011010]，[10100110011001011010010110101010]，[01011001101001101010011010100101]，[10100110011001100101010110100101]，[01011010010110101010100110011010]，[10100110011001101001101001010101]，[01011010101001100101100101011001]，[10100110011001101010100101100101]，[01100101010101101001011001100110]，[10100110011010010110100101010101]，[01100101011001011010101001100110]，[10100110011010101010010110010101]，[01100101100101010110101001100110]，[10100110100110011001101010010101]，[01100101101001010101011001100110]，[10101001100110011001011001011010]，[01100110010101101010100110100110]，[10101010010110100110011001100101]，[01100110010110100101011010101010]，[10101010100101011010010110011001]，[01100110010110100101101010101001]，[01010101100101101001100110011010]，[01101001011010011001101010101001]，[01010101100110011001011010011010]，[01101010100101100101100110011001]，[01010110011001011010100110100101]，[01101010101001011010011001101001]，[01011001010110101010100110011010]，[01101010101001100110100101101001]，[01011001100101010101101010011010]，[01101010101010010110100101100110]，[01011001100110010110100110101010]，[10010101010101101001011010011001]，[01011001101001011001100110101010]，[10010101010110011001011010010110]，[01011010011010011001100110010101]，[10010101010110100101100110010110]，[01100101100110010101100110101001]，[10010101011010011010011001100110]，[01100110010101011010011010100110]，[10010110100101100110010101010110]，[01100110011001011010101001101001]，[10011001101001011010010101010110]，[01100110100101101001010101010110]，[10011001101001011010100101010101]，[01101001100110101010100101011001]，[10011001101010010101011001011001]，[01101010011001010110011001011001]，[10011010010110101010100110011001]，[10010101100110101001100110100110]，[10011010011010101001010110011001]，[10010110011001010101011010100110]，[10011010100110100101010110011001]，[10011001011010010110101010101001]，[10011010101010010110100110011001]，[10011001100110100101010110010110]，[10100101010110011010011010100110]，[10011001101010100101100101011001]，[10100101101001010101011001100101]，[10011010011001101010011001010110]，[10100110010110010101100101011010]，[10100101100101100110011001101010]，[10100110011001010101010110100101]，[10100110010110100110011001010101]，[10100110100110011001100101011010]，[10100110011001101001011001010101]，[10101001011001011001010110011001]，[10100110011010101010010101100101]，[10101001101010010101011001101001]，[10100110101001010101011001100101]，[10101010010101100101011001011001]，[10101001100110100101011001011010]，[10101010010101100110011010011010]，[10101010011001100110100101100101]，[01010101100110011010010110011010]，[10101010011010010110011001100101]，[01010110010110101010100110011010]，[01011001011010011001100110101010]，[01010110100110100110011001100101]，[01011001011010101001100110011010]，[01010110101001100110011010011010]，[01011001100110011010011010010101]，[01011001011001100110101001010101]，[01100110011001011010011010101001]，[01011001100101101001010101011010]，[01101001100110011010101001011001]，[01011001100110100101101010101001]，[01101010101001101001011001100110]，[01011010010110011010101010011001]，[10010101010110010110100110011001]，[01011010100110011001100101100101]，[10010110011001100101010110100110]，[01011010100110101001101001100101]，[10011001100110100101100101010110]，[01011010101010010110100110011010]，[10100110011001100101100101101010]，[01011010101010011010011001100101]，[10100110100101010110011001100101]，[01100101011010101010011001101001]，[10100110100101100110011001010101]，[01100101101001100110011010101001]，[01011001100110011010010110101010]，[01100110010101100101100101101010]，[01011010010101011001100110011010]，[01100110010110010110010101101010]，[10100101101010100110011001100101]，[01100110011001011001011010101001]，[10100110011001100101101001010101]，[01100110011010010110010101010110]，[01011010100110011001011001011001]，[01100110011010010110101010100110], [10100101011001100110100110100110], [01100110100101101010011001010101], [01011010101010011001100101100101], [01100110100110101010101001010110], [01100110010110010101101010101001], [01101001101001010101100110011001], [10011001101001101010010101010110], [01101001101010011010100101010110], [10100101010101100110011010011010].,

[0405] fourth sequence

[0406] In addition to the first sequence mentioned above, in some embodiments, the first PPDU can further include a fourth sequence. The fourth sequence can be used for clock calibration by the second device.

[0407] The fourth sequence can include a plurality of bits for clock calibration. For example, the fourth sequence includes n repetitions of "01" or "10". After recognizing the fourth sequence, the second device can perform clock calibration based on the fourth sequence.

[0408] Embodiments of the present application do not specifically limit the bearing position of the fourth sequence in the first PPDU.

[0409] In some embodiments, the fourth sequence is located in the synchronization field of the first PPDU. That is, the synchronization field can include the fourth sequence in addition to the first sequence mentioned above. In the synchronization field, as shown in FIG. 9B, the fourth sequence can be located before the first sequence in the time domain, or the fourth sequence can be located after the first sequence in the time domain. The fourth sequence and the first sequence can jointly constitute a synchronization sequence in the synchronization field.

[0410] In other embodiments, the fourth sequence can be located in other information fields of the first PPDU other than the synchronization field. For example, the fourth sequence can be located before the first sequence in the time domain (as shown in FIG. 9C), or the fourth sequence can be located after the first sequence. In other words, the information field where the fourth sequence is located is located before the synchronization field, or is located after the synchronization field.

[0411] In some implementations, the aforementioned synchronization field is the first information field of the first PPDU in time domain. Or, the synchronization field is located at the most front end of the first PPDU. For example, the first PPDU (or the narrowband part of the first PPDU) sequentially includes, in time domain order: a fourth sequence, a first sequence, other bit fields.

[0412] a fifth sequence

[0413] The synchronization based on the first sequence is achieved by generating a correlation peak by correlating with the local code, but other fields in the PPDU can also be correlated with the local code to generate a correlation peak under low signal-to-noise ratio, and multiple correlation peaks can affect the correct synchronization of the receiving end and the sending end, thereby generating a false alarm. Therefore, in some implementations, the aforementioned fifth sequence can be introduced in the first PPDU to reduce the probability of false alarm.

[0414] In some implementations, the fifth sequence is used to identify the starting position of the first sequence. The time position of the first sequence is determined based on the fifth sequence. Alternatively, if the second device obtains multiple correlation peaks by correlation, the second device can determine the first correlation peak after the starting position of the first sequence as the correlation peak for synchronization. Alternatively, the second device can first determine the correlation peak after the starting position and determine it as the correlation peak for synchronization, and then the second device can no longer perform subsequent sliding correlation operations. Alternatively, the second device can start to perform the sliding correlation operation after detecting the fifth sequence.

[0415] In some implementations, the fifth sequence can include n consecutive 0s or n consecutive 1s, where n is a positive integer greater than or equal to 1. Or, the fifth sequence can include n repeated 0s or n repeated 1s. Alternatively, the fifth sequence is an all-0 sequence or an all-1 sequence, and the duration of the fifth sequence is greater than or equal to m microseconds, where m is a positive integer greater than or equal to 1. The data field of the first PPDU can use Manchester coding, and after Manchester coding, the data field will not have consecutive 0s or consecutive 1s, so that the fifth sequence can be well distinguished from the information in the data field, thereby playing a role in identifying the starting position of the first sequence. The value of n is a positive integer, for example, it can be a positive integer greater than or equal to 3, such as 3, 4, 5, or 6. Of course, n can also be other values such as 1, 2, 7, 8, 9, or 10. Exemplarily, when n is 3, the fifth sequence can be 000 or 111. The present application does not elaborate on the fifth sequence when n takes other values. The value of m is a positive number, which can be greater than or equal to 6 microseconds, and / or the value of m is less than or equal to 9, so that the transmission duration of the first sub-sequence does not exceed 9us. Of course, m can also be equal to 5, 6, 7, 8, or 10, etc.

[0416] For example, the fifth sequence is continuous 0, and the duration of the fifth sequence is greater than the time length corresponding to 2 chips in the data portion (as mentioned above, m is equal to the time length corresponding to 2 chips in the data portion), or the duration of the fifth sequence is greater than or equal to the time length corresponding to 3 chips in the data portion (as mentioned above, m is equal to the time length corresponding to 3 chips in the data portion). In this way, the fifth sequence can be well distinguished from the data portion, so that the second device will not detect the data portion as the first sequence.

[0417] The above implementation of the fifth sequence will be described in more detail below.

[0418] When the second device detects the first PPDU, even if the second device starts to attempt synchronization detection in the middle part of the first PPDU, when the data portion of the first PPDU is received, since the data portion adopts Manchester coding, it at most contains two consecutive 0s or two consecutive 1s, therefore, as long as the number of consecutive 0s (or consecutive 1s) in the fifth sequence or the duration of the fifth sequence can be distinguished from the Manchester coded data of the data portion, the data portion of the first PPDU can be distinguished from the fifth sequence, so that the second device will not detect the data portion as the first sequence.

[0419] In addition, since the data frame of WiFi of the OFDM waveform or the data frame of WiFi of the DSSS waveform will not appear continuous signal interruption, when the fifth sequence is continuous n 0s, a signal interruption is formed after the wideband portion of the first PPDU (see FIG. 14, it should be understood that FIG. 14 is only an example, the energy of the wideband portion and the narrowband portion can be the same or different), thereby forming a time domain signal feature different from the WiFi signal, so that the first PPDU can be distinguished from other WiFi frames through the fifth sequence.

[0420] As a specific example, when the chip width of the Manchester coded data portion is consistent with the chip width of the fifth sequence, if n is greater than or equal to 3 (i.e., the fifth sequence contains 3 consecutive chips with a value of 0), the fifth sequence can be well distinguished from the data portion, so that the second device will not detect the data portion as the first sequence.

[0421] However, it should be noted that the above-mentioned n value or m value should not be too large, otherwise it will cause the first PPDU to contain a too long zero-power transmission time, thereby causing the channel to be judged as idle by other WiFi devices, and further causing other WiFi devices to preempt the channel.

[0422] Alternatively, in some implementations, in order to enable the second device to correctly identify the fifth sequence, the fifth sequence can also be a predefined sequence (or a preset specific sequence). For example, the fifth sequence can be a plurality of 01 or 10 in succession. Alternatively, the fifth sequence can include n 1s plus v 0s, or the fifth sequence can include n 0s plus v 1s, and the value of v can be less than n, such as 1. Due to the clock error between the second device and the first device, there is a certain error between the width of the signal received by the second device and the expected signal width. Therefore, there can be a transition of 1 '10' or '01' at the end of the fifth sequence, which is used to indicate the true width of the subsequent signal. Exemplarily, the fifth sequence can be 1110, 0001, 11101 or 00010.

[0423] The fifth sequence can be located before the first sequence. Therefore, after the second device identifies the fifth sequence, the second device can start to perform correlation operation, so as to avoid using the data field and the local code to perform correlation operation, or even if the data field and the local code are used to perform correlation operation, the second device can accurately identify which correlation peak is the correlation peak for synchronization.

[0424] The embodiment of the present application does not specifically limit the bearing position of the fifth sequence in the first PPDU.

[0425] In some implementations, the fifth sequence is located in the synchronization field of the first PPDU. That is, the synchronization field can include the fifth sequence in addition to the first sequence mentioned above. In the synchronization field, as shown in FIG. 9D, the fifth sequence can be located before the first sequence in the time domain. The fifth sequence and the first sequence can jointly constitute the synchronization sequence in the synchronization field.

[0426] In other implementations, the fifth sequence can be located in the information field of the first PPDU other than the synchronization field. For example, the information field where the fifth sequence is located is located before the synchronization field, as shown in FIG. 9E.

[0427] In some implementations, the synchronization field mentioned above is the first information field of the first PPDU in the time domain. Alternatively, the synchronization field is located at the front end of the first PPDU. For example, the first PPDU (or the narrowband part of the first PPDU) includes, in the time domain in the order of sequence, the fifth sequence, the first sequence, and other bit fields.

[0428] In some embodiments, the fifth sequence is used to indicate one or more transmission parameters associated with the first PPDU (e.g., one or more transmission parameters of the data field). For example, the fifth sequence can include a plurality of candidate sequences, each of which corresponds to one or more transmission parameters associated with the first PPDU, wherein different candidate sequences correspond to different transmission parameters. The transmission parameters mentioned above can include one or more of the following: data rate, symbol length, transmission mode, waveform, coding mode.

[0429] For example, the fifth sequence can include candidate sequence 1 and candidate sequence 2, candidate sequence 1 is 000, and candidate sequence 2 is 111, wherein the data rate indicated by candidate sequence 1 is 250kbps, and the data rate indicated by candidate sequence 2 is 1Mbps.

[0430] In some embodiments, the chip duration of the fifth sequence is related to the chip duration of the data field of the first PPDU. Alternatively, the chip duration of the fifth sequence can be determined based on the chip duration of the data field of the first PPDU. Alternatively, the chip duration of the fifth sequence changes with the change of the chip duration of the data field of the first PPDU. The data field is generally Manchester coded, so the chip duration of the data field can refer to the chip duration corresponding to the Manchester coded data field.

[0431] The application does not specifically limit the association manner between the chip duration of the fifth sequence and the chip duration of the data field of the first PPDU.

[0432] For example, the chip duration of the fifth sequence is equal to the chip duration of the data field. Since the data field is Manchester coded, it cannot have three or more consecutive 0s or three or more consecutive 1s. Therefore, the fifth sequence can include three or more consecutive 0s or three or more consecutive 1s, so as to be distinguished from the data field, so that the receiver can exclude the correlation peak caused by the data field based on the fifth sequence, thereby reducing false alarm.

[0433] For another example, the chip duration of the fifth sequence is not equal to the chip duration of the data field, but there is a mapping relationship between them. The mapping relationship between them can be a proportional relationship, a multiple relationship or other function mapping relationship. For example, the chip duration of the fifth sequence can be half of the chip duration of the data field. For example, when the data rate of the data field is 250kbps, the chip duration can be 2 microseconds. In this case, the chip duration of the fifth sequence can be 1 microsecond. For example, when the data rate of the data field is 1Mbps, the chip duration can be 0.5 microseconds. In this case, the chip duration of the fifth sequence can be 0.25 microseconds.

[0434] The fifth sequence can or can not be encoded. Exemplarily, the fifth sequence can be Manchester encoded. If the fifth sequence needs to be encoded (e.g., Manchester encoded), the aforementioned chip duration of the fifth sequence can refer to the chip duration corresponding to the fifth sequence after encoding. For example, the chip duration corresponding to the fifth sequence after Manchester encoding is related to the chip duration corresponding to the data field after Manchester encoding, e.g., the former is half or 2 times of the latter.

[0435] Exemplarily, the data rate of the data field is 250 kbps, and the chip duration corresponding to the data field after Manchester encoding is 2 microseconds. At this time, if the chip duration corresponding to the fifth sequence after Manchester encoding is half of the chip duration corresponding to the data field after Manchester encoding, it can be determined that the chip duration corresponding to the fifth sequence after Manchester encoding is 1 microsecond.

[0436] The fifth sequence is Manchester encoded, and the chip duration of the fifth sequence after Manchester encoding is set to be different from the chip duration of the data field after Manchester encoding, which can improve the decoding performance of the fifth sequence, and also helps the receiver to exclude the correlation peak caused by the data field based on the fifth sequence, thereby reducing false alarm. The following takes an example of the chip duration of the fifth sequence after Manchester encoding being half of the chip duration of the data field after Manchester encoding to illustrate this.

[0437] After Manchester encoding, the fifth sequence presents a combination of '10' and / or '01'. If the chip duration of the fifth sequence after Manchester encoding is considered, and the chip duration of the data field is twice the chip duration of the fifth sequence after Manchester encoding, the data field presents a combination of '00' and / or '11'. Based on this, the receiver can clearly distinguish the fifth sequence and the data field, and the longer the length of the fifth sequence before encoding is, the lower the possibility of decoding the signal of the data field into the fifth sequence. As can be seen, Manchester encoding of the fifth sequence helps to improve the decoding performance of the fifth sequence, and also helps the receiver to exclude the correlation peak caused by the data field based on the fifth sequence, thereby reducing false alarm.

[0438] In some implementations, the fifth sequence (which can be located before the first sequence and continuous with the first sequence in the first PPDU) includes consecutive n 0s or consecutive n 1s, and the value of n is related to the value of the first bit of the first sequence. For example, if the fifth sequence is consecutive n 0s and the first bit of the first sequence is 0, the value of n is a; if the fifth sequence is consecutive n 0s and the first bit of the first sequence is 1, the value of n is a+1. For another example, if the fifth sequence is consecutive n 1s and the first bit of the first sequence is 1, the value of n is a; if the fifth sequence is consecutive n 1s and the first bit of the first sequence is 0, the value of n is a+1.

[0439] Sixth sequence

[0440] In addition to the fifth sequence, in order to reduce the false alarm probability, in some implementations, a sixth sequence mentioned below can also be introduced in the first PPDU to reduce the false alarm probability.

[0441] In some implementations, the sixth sequence is used to identify the ending position of the first sequence. Based on the sixth sequence, the last correlation peak before the ending position of the first sequence can be determined as the correlation peak used for synchronization. Alternatively, if the second device obtains multiple correlation peaks through correlation, the second device can determine the last correlation peak before the ending position of the first sequence as the correlation peak used for synchronization. Alternatively, the second device can first determine the last correlation peak before the ending position and determine it as the correlation peak used for synchronization, and then the second device can no longer perform subsequent sliding correlation operations.

[0442] In some implementations, the sixth sequence can include t consecutive 0s or t consecutive 1s, t being a positive integer greater than or equal to 1. Alternatively, the sixth sequence can include t repeated 0s or t repeated 1s. Alternatively, the sixth sequence is an all-0 sequence or an all-1 sequence, and the duration of the sixth sequence is greater than or equal to p microseconds, p being a positive integer greater than or equal to 1. The data field of the first PPDU can be Manchester encoded, and after Manchester encoding, the data field will not have consecutive 0s or consecutive 1s, so that the sixth sequence can be well distinguished from the information in the data field, thereby playing a role in identifying the ending position of the first sequence. The value of t is a positive integer, for example, it can be a positive integer greater than or equal to 3, such as 3, 4, 5, or 6. Of course, t can also be other values such as 1, 2, 7, 8, 9, or 10. Exemplarily, when t is 3, the sixth sequence can be 000 or 111. The present application does not repeat the sixth sequence when t takes other values. The value of p is a positive number, and optionally, the value of p is less than or equal to 9, so that the transmission duration of the first sub-sequence does not exceed 9us. Of course, p can also be equal to 5, 6, 7, 8, or 10, etc.

[0443] As described above, since the data part is Manchester encoded, it contains at most two consecutive 0s or two consecutive 1s, so as long as the number of bits contained in the sixth sequence (including consecutive 0s or consecutive 1s) or the duration of the sixth sequence can be distinguished from the Manchester encoded data of the data part, the data part of the first PPDU can be distinguished from the first sequence, so that the second device will not mistakenly detect the data part as the first sequence.

[0444] For example, the sixth sequence is a sequence of consecutive 0s or consecutive Is, and the duration of the sixth sequence is greater than the time duration corresponding to 2 chips in the data portion (as mentioned above, p is equal to the time duration corresponding to 2 chips in the data portion), or the duration of the sixth sequence is greater than or equal to the time duration corresponding to 3 chips in the data portion (as mentioned above, p is equal to the time duration corresponding to 3 chips in the data portion). In this way, the sixth sequence can be well distinguished from the data portion, so that the second device will not detect the data portion as the first sequence.

[0445] As a specific example, when the data portion has a Manchester-coded chip width consistent with the chip width of the first sub-sequence, if t is greater than or equal to 3 (i.e., the first sub-sequence contains consecutive 3 chips with a value of 0), the sixth sequence can be well distinguished from the data portion, so that the second device will not detect the data portion as the first sequence.

[0446] Alternatively, in some implementations, in order to enable the second device to correctly identify the sixth sequence, the sixth sequence can also be a predefined sequence (or a preset specific sequence). For example, the sixth sequence is a sequence of consecutive 01s or 10s. Alternatively, the sixth sequence can include t Is and w 0s, or the sixth sequence can include t 0s and w Is, and w can be less than n, such as w can be 1. Because of the clock error between the second device and the first device, there is a certain error between the width of the signal received by the second device and the expected signal width. Therefore, there can be a transition of 1 '10' or '01' at the end of the sixth sequence, indicating the true width of the subsequent signal. For example, the sixth sequence can be 1110, 0001, 11101 or 00010.

[0447] The sixth sequence can be located after the first sequence. Therefore, after identifying the sixth sequence, the second device can end the correlation operation, so as to avoid using the data field and the local code for the correlation operation, or even if the data field and the local code are used for the correlation operation, the second device can accurately identify which correlation peak is the correlation peak for synchronization.

[0448] The embodiments of the present application do not specifically limit the bearing position of the sixth sequence in the first PPDU.

[0449] In some implementations, the sixth sequence is located in the synchronization field of the first PPDU. That is, the synchronization field can include the sixth sequence in addition to the first sequence mentioned above. In the synchronization field, as shown in FIG. 9F, the sixth sequence can be located after the first sequence in the time domain. The sixth sequence and the first sequence can jointly constitute the synchronization sequence in the synchronization field.

[0450] In some implementations, the sixth sequence can be located in a field of the first PPDU other than the synchronization field. For example, the field in which the sixth sequence is located is located after the synchronization field, as shown in FIG. 9G.

[0451] In some implementations, the aforementioned synchronization field is the first field of the first PPDU in the time domain. Alternatively, the synchronization field is located at the front end of the first PPDU. For example, the first PPDU (or the narrowband portion of the first PPDU) includes, in time domain order, the first sequence, the sixth sequence, and other bit fields.

[0452] Alternatively, the first PPDU (or the narrowband portion of the first PPDU) can include only one of the fifth sequence or the sixth sequence, so that the false alarm probability can be reduced by fewer newly added sequences. Alternatively, the first PPDU (or the narrowband portion of the first PPDU) can include both the fifth sequence and the sixth sequence, so that the correlation peak for synchronization can be more accurately determined by two sequences than by one sequence. In this way, the first PPDU can be distinguished from other WiFi frames, and the data portion can be prevented from being misdetected as the first sequence by the second device. For the functions of the fifth sequence and the sixth sequence, refer to the foregoing description, which will not be repeated here.

[0453] Alternatively, the first PPDU (or the narrowband portion of the first PPDU) can include both the first sequence and the fourth sequence. In addition, the first PPDU (or the narrowband portion of the first PPDU) can include the fifth and / or sixth sequence. The first, fourth, fifth, and sixth sequences are described above and will not be repeated here.

[0454] For example, the first, fourth, fifth, and sixth sequences can be arranged in the first PPDU (or the narrowband portion of the first PPDU) in the order of the fourth sequence, the fifth sequence, the first sequence, and the sixth sequence. In this case, only the first sequence can be located in the synchronization field as a synchronization sequence, the fourth and fifth sequences can be located before the synchronization field, and the sixth sequence can be located after the synchronization field. Alternatively, the fifth and first sequences can be located in the synchronization field as synchronization sequences, the fourth sequence can be located before the synchronization field, and the sixth sequence can be located after the synchronization field. Alternatively, the first and sixth sequences can be located in the synchronization field as synchronization sequences, the fourth and fifth sequences can be located before the synchronization field. Alternatively, the fifth, first, and sixth sequences can be located in the synchronization field as synchronization sequences, and the fourth sequence can be located before the synchronization field. Alternatively, the fourth, fifth, first, and sixth sequences can be located in the synchronization field as synchronization sequences.

[0455] For example, the first PPDU (or the narrowband portion of the first PPDU) includes the first, fourth, and fifth sequences, which can be ordered in the first PPDU in the order of the fourth sequence, the fifth sequence, and the first sequence. In this scenario, only the first sequence can be located in the synchronization domain as the synchronization sequence, with the fourth and fifth sequences located before the synchronization domain; or only the fifth and first sequences can be located in the synchronization domain as the synchronization sequence, with the fourth sequence located before the synchronization domain; or the fourth, fifth, and first sequences can all be located in the synchronization domain as the synchronization sequence.

[0456] For example, the first PPDU (or the narrowband portion of the first PPDU) includes the first, fourth, and sixth sequences, which can be ordered in the first PPDU in the order of the fourth sequence, the first sequence, and the sixth sequence. In this scenario, only the first sequence can be located in the synchronization domain as the synchronization sequence, with the fourth sequence located before the synchronization domain and the sixth sequence located after the synchronization domain; or only the first and sixth sequences can be located in the synchronization domain as the synchronization sequence, with the fourth sequence located before the synchronization domain; or only the fourth and first sequences can be located in the synchronization domain as the synchronization sequence, with the sixth sequence located after the synchronization domain; or the fourth, first, and sixth sequences can all be located in the synchronization domain as the synchronization sequence.

[0457] In some implementations, the first sequence can be used to indicate the chip duration of the sixth sequence. For example, the first sequence includes a plurality of candidate sequences, each of which can correspond to a chip duration.

[0458] In some implementations, the sixth sequence is used to indicate one or more transmission parameters associated with the first PPDU (such as one or more transmission parameters of the data field). For example, the sixth sequence can include a plurality of candidate sequences, each of which corresponds to one or more transmission parameters associated with the first PPDU, wherein different candidate sequences correspond to different transmission parameters. The transmission parameters mentioned above can include one or more of the following: data rate, symbol length, transmission mode, waveform, coding mode.

[0459] For example, the sixth sequence can include candidate sequence 1 and candidate sequence 2, candidate sequence 1 being 000 and candidate sequence 2 being 111, wherein candidate sequence 1 indicates a data rate of 250 kbps and candidate sequence 2 indicates a data rate of 1 Mbps.

[0460] In some implementations, the chip duration of the sixth sequence is related to the chip duration of the data field of the first PPDU. Alternatively, the chip duration of the sixth sequence can be determined based on the chip duration of the data field of the first PPDU. Alternatively, the chip duration of the sixth sequence varies with the chip duration of the data field of the first PPDU. The data field is generally Manchester coded, and thus the chip duration of the data field can refer to the chip duration corresponding to the Manchester coded data field.

[0461] The application does not limit the manner in which the chip duration of the sixth sequence is related to the chip duration of the data field of the first PPDU.

[0462] For example, the chip duration of the sixth sequence is equal to the chip duration of the data field. Since the data field is Manchester coded, it cannot have three or more consecutive 0s or three or more consecutive 1s. Therefore, the sixth sequence can include three or more consecutive 0s or three or more consecutive 1s, thereby distinguishing from the data field, facilitating the receiver to exclude the correlation peak caused by the data field based on the sixth sequence, thereby reducing false alarms.

[0463] For another example, the chip duration of the sixth sequence is not equal to the chip duration of the data field, but there is a mapping relationship between the two. The mapping relationship between the two may, for example, be a proportional relationship, a multiple relationship, or other functional mapping relationship. For example, the chip duration of the sixth sequence can be half of the chip duration of the data field. For example, if the data rate of the data field is 250kbps, the chip duration of the data field can be 2 microseconds. In this case, the chip duration of the sixth sequence can be 1 microsecond. For example, if the data rate of the data field is 1Mbps, the chip duration of the data field can be 0.5 microseconds. In this case, the chip duration of the sixth sequence can be 0.25 microseconds.

[0464] The sixth sequence can be encoded or not. For example, the sixth sequence can be Manchester coded. If the sixth sequence needs to be encoded (such as Manchester coding), the chip duration of the sixth sequence mentioned above can refer to the chip duration corresponding to the encoded sixth sequence. For example, the chip duration corresponding to the Manchester coded sixth sequence is related to the chip duration corresponding to the Manchester coded data field, such as the former being half or twice the latter.

[0465] For example, the data rate of the data field is 250kbps, and the chip duration corresponding to the Manchester coded data field is 2 microseconds. At this time, if the chip duration corresponding to the Manchester coded sixth sequence is half of the chip duration corresponding to the Manchester coded data field, it can be determined that the chip duration corresponding to the Manchester coded sixth sequence is 1 microsecond.

[0466] The sixth sequence is Manchester coded, and the Manchester coded chip duration of the sixth sequence and the Manchester coded chip duration of the data field are set to be different, which can improve the decoding performance of the sixth sequence, and also helps the receiver to exclude the correlation peak caused by the data field based on the sixth sequence, thereby reducing false alarm. The following takes the Manchester coded chip duration of the sixth sequence as half of the Manchester coded chip duration of the data field as an example to illustrate this.

[0467] After Manchester coding, the sixth sequence presents a combination of '10' and / or '01'. If the Manchester coded chip duration of the sixth sequence is considered, the chip duration of the data field is twice the Manchester coded chip duration of the sixth sequence, and the data field presents a combination of "00" and / or "11". Based on this, the receiver can clearly distinguish the sixth sequence and the data field, and the longer the length of the sixth sequence before coding, the lower the possibility of decoding the signal of the data field into the sixth sequence. As can be seen, Manchester coding of the sixth sequence helps to improve the decoding performance of the sixth sequence, and also helps the receiver to exclude the correlation peak caused by the data field based on the sixth sequence, thereby reducing false alarm.

[0468] In some implementations, the sixth sequence (which can be located after the first sequence, and the first sequence and the sixth sequence are continuous in the first PPDU) includes continuous t 0s or continuous t 1s, and the value of t is related to the value of the last 1 bit of the first sequence. For example, if the sixth sequence is continuous t 0s, and the last 1 bit of the first sequence is 0, then the value of t is a; if the sixth sequence is continuous t 0s, and the last 1 bit of the first sequence is 1, then the value of t is a+1. For another example, if the sixth sequence is continuous t 1s, and the last 1 bit of the first sequence is 1, then the value of t is a; if the sixth sequence is continuous t 1s, and the last 1 bit of the first sequence is 0, then the value of t is a+1.

[0469] The method embodiments of the present application are described in detail above in combination with FIGS. 1-9C, and the device embodiments of the present application are described in detail below in combination with FIGS. 10-12. It should be understood that the description of the method embodiments and the description of the device embodiments correspond to each other, and therefore, the parts not described in detail can be referred to the previous method embodiments. For example, the first sequence mentioned in the device embodiments can use the first sequence mentioned in any of the method embodiments.

[0470] FIG. 10 is a schematic diagram of a structure of a communication device according to an embodiment of the present application. The communication device 1000 shown in FIG. 10 can be the first device mentioned in the foregoing embodiments. The communication device 1000 can include a communication module 1010. The communication module 1010 is configured to send a first PPDU to a second device. The first PPDU includes a synchronization field, and a sequence in the synchronization field includes a first sequence. The implementation of the functions of the communication module 1010 can refer to the method embodiments shown in FIGS. 1-9C, and details are not described herein. The first PPDU sent by the communication device 1000 can refer to the description of the first PPDU in the method embodiments shown in FIGS. 1-9C, and details are not described herein.

[0471] FIG. 11 is a schematic diagram of a structure of a communication device according to another embodiment of the present application. The communication device 1100 shown in FIG. 11 can be the second device mentioned in the foregoing embodiments. The communication device 1100 can include a communication module 1110. The communication module 1110 is configured to receive a first PPDU sent by a first device. The first PPDU includes a synchronization field, and a sequence in the synchronization field includes a first sequence. The implementation of the functions of the communication module 1110 can refer to the method embodiments shown in FIGS. 1-9C, and details are not described herein. The first PPDU received by the communication device 1100 can refer to the description of the first PPDU in the method embodiments shown in FIGS. 1-9C, and details are not described herein.

[0472] FIG. 12 is a schematic structural diagram of a communication apparatus to which embodiments of the present application can be applied. The dashed line in FIG. 12 indicates that the unit or module is optional. The apparatus 1200 can be used to implement the method described in the foregoing method embodiments. The apparatus 1200 can be a chip, a terminal device, or a network device.

[0473] The apparatus 1200 can include one or more processors 1210. The processor 1210 can support the apparatus 1200 to implement the method described in the foregoing method embodiments. The processor 1210 can be a general purpose processor or a dedicated processor. For example, the processor can be a central processing unit (CPU). Alternatively, the processor can also be other general purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic, discrete hardware components, etc. The general purpose processor can be a microprocessor or the processor can also be any conventional processor.

[0474] The apparatus 1200 can further include one or more memories 1220. The memories 1220 store a program that can be executed by the processor 1210, so that the processor 1210 performs the methods described in the foregoing method embodiments. The memories 1220 can be independent of the processor 1210 or integrated in the processor 1210.

[0475] The apparatus 1200 can further include a transceiver 1230. The processor 1210 can communicate with other devices or chips through the transceiver 1230. For example, the processor 1210 can perform data transceiving with other devices or chips through the transceiver 1230.

[0476] The embodiments of the present application also provide a computer readable storage medium for storing a program. The computer readable storage medium can be applied to the terminal device or the network device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the communication device in the various embodiments of the present application.

[0477] The embodiments of the present application also provide a computer program product. The computer program product includes a program. The computer program product can be applied to the terminal device or the network device provided by the embodiments of the present application, and the program causes the computer to execute the method performed by the communication device in the various embodiments of the present application.

[0478] The embodiments of the present application also provide a computer program. The computer program can be applied to the terminal device or the network device provided by the embodiments of the present application, and the computer program causes the computer to execute the method performed by the communication device in the various embodiments of the present application.

[0479] It should be understood that the terms "system" and "network" can be used interchangeably in the present application. In addition, the terms used in the present application are only used to explain the specific embodiments of the present application, and are not intended to limit the present application. The terms "first", "second", "third", and "fourth" and the like in the specification and claims of the present application and the drawings are used to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0480] In the embodiments of the present application, the "indication" mentioned can be direct indication, or indirect indication, or can be an indication with an associated relationship. For example, A indicates B, which can mean that B can be obtained by A directly; or A indirectly indicates B, for example, A indicates C, and B can be obtained by C; or A and B have an associated relationship.

[0481] In embodiments of the present application, "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that the determination of B according to A does not mean that B is determined only according to A, but B can also be determined according to A and / or other information.

[0482] In embodiments of the present application, the term "corresponding" can represent a direct or indirect corresponding relationship between the two, can also represent an associated relationship between the two, or can indicate a relationship with the indicated, configured, and the like.

[0483] In embodiments of the present application, "predefined" or "preconfigured" can be implemented by pre-saving corresponding codes, tables or other ways that can be used to indicate related information in devices (for example, including terminal devices and network devices), and the specific implementation manner is not limited in the present application. For example, predefinition can refer to definition in a protocol.

[0484] In embodiments of the present application, the "protocol" can refer to a standard protocol in the communication field, which can include, for example, an LTE protocol, an NR protocol, and a related protocol applied to a future communication system, and the present application is not limited thereto.

[0485] In embodiments of the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent the following three cases: A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this paper generally represents an "or" relationship between the associated objects before and after it.

[0486] In various embodiments of the present application, the size of the serial number of the above processes does not mean the order of execution, and the execution order of the processes should be determined according to its function and inherent logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0487] In several embodiments provided by the present application, it should be understood that the disclosed system, device and method can be implemented by other ways. For example, the device embodiments described above are only schematic, and the division of the units is only a logical function division, and there can be another division way in actual implementation, for example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, devices or units, and can be electrical, mechanical or other forms.

[0488] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e., may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected to achieve the purpose of the embodiment of the present application according to actual needs.

[0489] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can be physically present alone, or two or more units can be integrated in one unit.

[0490] In the above embodiments, all or part can be realized by software, hardware, firmware or any combination thereof. When realized by software, all or part can be realized in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed by a computer, the computer instructions produce the processes or functions described in the embodiments of the present application. The computer can be a general-purpose computer, a special-purpose computer, a computer network or other programmable device. The computer instructions can be stored in a computer readable storage medium or transferred from one computer readable storage medium to another, for example, the computer instructions can be transferred from one website, computer, server or data center to another website, computer, server or data center through wired (such as coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (such as infrared, wireless, microwave, etc.) mode. The computer readable storage medium can be any available medium readable by a computer or a data storage device such as a server, data center, etc. integrated with one or more available media. The available media can be magnetic media (such as floppy disk, hard disk, magnetic tape), optical media (such as digital video disc (DVD)) or semiconductor media (such as solid state disk (SSD)) and the like.

[0491] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

A communication method characterized by comprising: Comprising: a first device sending a first physical layer protocol data unit (PPDU) to a second device; wherein the first PPDU comprises a synchronization field, and a sequence in the synchronization field comprises a first sequence. The method of claim 1, wherein The first sequence comprises a first number of 0s and a second number of 1s, and the first number and the second number are equal. The method according to claim 1 or 2, characterized in that Consecutive 0s or consecutive 1s in the first sequence correspond to modulation symbols occupying a time duration less than or equal to a first time duration. The method according to claim 3, characterized in that The first time duration is less than or equal to 9 microseconds. The method according to claim 4, characterized in that The first time duration is 8 microseconds. The method according to any one of claims 1 to 5, characterized in that A first bit of the first sequence is 1. The method according to any one of claims 1 to 6, characterized in that The first sequence is one of a plurality of candidate sequences of the synchronization field, each candidate sequence of the plurality of candidate sequences corresponding to one or more transmission parameters, wherein different candidate sequences correspond to different transmission parameters. The method of claim 7, wherein The transmission parameters comprise one or more of: a data rate, a symbol length, a transmission mode, a waveform, a coding mode. The method according to any one of claims 1 to 8, characterized in that The first sequence is one of one or more candidate sequences of the synchronization field, the one or more candidate sequences being associated with a base sequence set, the base sequence set comprising M base sequences, M being an integer greater than or equal to 1. The method of claim 9, wherein The one or more candidate sequences being associated with the base sequence set comprises: The one or more candidate sequences are candidate sequences corresponding to the M base sequences, wherein each base sequence corresponds to N candidate sequences, N being an integer greater than or equal to 1. The method of claim 10, wherein Each base sequence corresponding to N candidate sequences comprises: Each base sequence corresponds to N candidate sequences in N ways, respectively. The method of claim 11, wherein The N ways comprise one or more of: A candidate sequence is the corresponding base sequence; A candidate sequence is a complement sequence of the corresponding base sequence; A candidate sequence is a sequence formed by repeating connection of the corresponding base sequence; A candidate sequence is a sequence formed by repeating connection of a complement sequence of the corresponding base sequence; A candidate sequence is a sequence formed by connection of the corresponding base sequence and a complement sequence of the corresponding base sequence. The method according to any one of claims 10 to 12, characterized in that The one or more candidate sequences include one or more of the following: wherein [G] represents the set of said base sequences, A complement sequence set of the base sequence set is represented. The method according to any one of claims 10 to 13, characterized in that A sum of values of related parameters of the N candidate sequences corresponding to each base sequence is greater than or equal to a first value. The method of claim 14, wherein A value of a related parameter of each candidate sequence is associated with a sliding correlation result of the candidate sequence and a second sequence corresponding to the candidate sequence, wherein the second sequence corresponding to the candidate sequence is associated with a base sequence corresponding to the candidate sequence. The method of claim 15, wherein: The value of the related parameter of each candidate sequence comprises: a ratio of a maximum value and a second maximum value in absolute values of the sliding correlation result of each candidate sequence and a second sequence corresponding to the candidate sequence; or The value of the related parameter of each candidate sequence comprises: a ratio of an absolute value of a maximum value and a second maximum value in the sliding correlation result of each candidate sequence and a second sequence corresponding to the candidate sequence; or The value of the related parameter of each candidate sequence comprises: a ratio of a minimum value and a second minimum value in the sliding correlation result of each candidate sequence and a second sequence corresponding to the candidate sequence; or The value of the related parameter of each candidate sequence comprises: a ratio of a maximum value and a second maximum value in the sliding correlation result of each candidate sequence and a second sequence corresponding to the candidate sequence. The method according to claim 15 or 16, characterized in that The second sequence corresponding to the candidate sequence being associated with the base sequence corresponding to the candidate sequence comprises: Ref = 2 x G m -1, wherein Ref denotes the second sequence corresponding to the candidate sequence, G m denotes the mth sequence in the base sequence set [G], 1≤m≤M, and G m is the base sequence corresponding to the candidate sequence. The method according to any one of claims 1 to 17, characterized in that The first sequence has a cross-correlation with a third sequence less than or equal to a second value, the third sequence being carried in a synchronization field of a narrow band part of a second PPDU, wherein the first PPDU is used for an access point (AP) to communicate with a first type of device, and the second PPDU is used for the AP to communicate with a second type of device. The method of claim 18, wherein The first type of device is an ambient energy (AMP) device, and the second type of device is a wake-up radio (WUR) based device. The method according to any one of claims 1 to 19, characterized in that The first sequence or a base sequence corresponding to the first sequence has a length of even number. The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 8. The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence includes a plurality of '01' and / or '10'; or, the first sequence or the base sequence corresponding to the first sequence includes a plurality of transitions of '01' and / or '10'. The method of claim 22, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [01001110]； [10110001]； [11000101]； [10001101]； [01110010]； [10100011]。 The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 10. The method of claim 25, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0110111000], [0111001001], [1000101101], [1000110110], [1001000111], [1010010011], [1011000101], [1011010001], [1100100101], [1101000110], [1110001001]. The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 12. The method of claim 27, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [011100010110], [011010001110]. The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 14. The method of claim 29, wherein [00011011101001], [00011101100101], [00101011100110], [00111010100110], [01000111001101], [01001011001110], [01001101011100], [01001101110010], [01010011100110], [01011001000111], [01011001001110], [01011001110010], [01011100010110], [01100011101001], [01101001000111], [01110001001011], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [11010001000111], [11010001010011], [11010010001110], [11010010100011], [11010100110001], [11100010011010], [11100010100101], [00101110110001], [01001011101100], [01001110011010], [01011011100010], [01100101001110], [01100111001010], [01100111010010], [01100111010100], [01101001100101], [01101001110001], [01101100100101], [01101100110010], [01101101100100], [01110001001010], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [11010001000111], [11010001010011], [11010010001110], [11010010100011], [11010100110001], [11100010011010], [11100010100101], [00101110110001], [01001011101100], [01001110011010], [01011011100010], [01100101001110], [01100111001010], [01100111010010], [01100111010100], [01101001100101], [01101001110001], [01101100100101], [01101100110010], [01101101100100], [01110001001010], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [110[01110001001110]，[01110001011001]，[01110001011010]，[10010101100011]，[10011100100101]，[10100011100110]，[10100110001110]，[10100110100011]，[10101001100011]，[11000101100101]，[11000110101001]，[11100010100110]，[00100111010110]，[00101101110001]，[00101110101100]，[00110100101110]，[00110101110100]，[00110111010010]，[00110111010100]，[00111000101101]，[00111010011010]，[01000111010110]，[01000111011010]，[01001100011101]，[01001101001110]，[01011000110110]，[01011001011100]，[01011100010011]，[01011100110010]，[01100011100101]，[01100101011100]，[01100101110001]，[01100111010100]，[01101000111010]，[01101001001110]，[01101010001110]，[01101011100010]，[01101011100100]，[01101100011010]，[01101101000110]，[01110001010011]，[01110001010110]，[01110001100101]，[01110001101001]，[01110010001110]，[01110010010110]，[01110010011010]，[01110010101100]，[01110010110010]，[01110100101100]，[10001100101011]，[10001100101101]，[10001100110101]，[10001101001101]，[10001101010011]，[10001101110100]，[10001110100110]，[10001110110010]，[10010100010111]，[10010111000110]，[10011000101101]，[10011010001110]，[10100011100101]，[10100100111001]，[10100110001101]，[10101001000111]，[10101100110001]，[10110001000111]，[10110001001101]，[10110001110010]，[10110100011100]，[10110100110001]，[11000100101101]，[11000110001011]，[11001001010011]，[11001010110001]，[11010001001110]，[11010001100011]，[11010010001101]，[11100010001011]，[11100010001101]，[11100010010011]，[11100010010101]，[11101000101001]，[01001100111010]，[01001110110010]，[01001011100110]。， The method according to any one of claims 1 to 20, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 16. The method of claim 31, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [1100011010001011]；[1100100101011100]；[1110001001010011]；[0011010110111000]； [0001110101101100]；[0001110110101100]；[0010111010011100]；[0011001001010111]； [0011010110100011]；[0011011010111000]；[0011101001010011]；[0011101010010011]； [1100010101101100]；[1100010110101100]；[1100100101000111]；[1100101001000111]； [1100110110101000]；[0001010110110011]；[1110001010010011]；[0011100101110100]； [1101000101100011]；[0011011010100011]。 The method of claim 31, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001001101010011]，[1001010001110110]，[1001010110010011]，[1001011001000111]，[1001100010010111]，[1001100101001011]，[1001101001000111]，[1001101010010011]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101010010011]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110]，[1101010001101001]，[1101010010011001]，[1101010011011000]，[1101100011010001]，[1101100100011010]，[1110001000110110]，[1110001001010011]，[1110001001101001]，[1110001001101010]，[1110001010001101]，[1110001010011001]，[1110001011000110]，[1110001100100101]，[1110010001010011]，[1110010001100101]，[1110010001101001]，[1110010001110100]，[1110010010101100]，[1110100100011001]。 The method of claim 33, wherein The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. The method of claim 34, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001010001110110]，[1001011001000111]，[1001100010010111]，[1001101001000111]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110]，[1101010001101001]，[1101010011011000]，[1101100011010001]，[1101100100011010]，[1110001000110110]，[1110001001010011]，[1110001001101001]，[1110001001101010]，[1110001010001101]，[1110001010011001]，[1110001011000110]，[1110001100100101]，[1110010001010011]，[1110010001100101]，[1110010001101001]，[1110010001110100]，[1110010010101100]，[1110100100011001]。 The method according to claim 32 or 33, characterized in that The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [1101000101100011]，[1100100101011100]，[1100011010001011]，[1100010110101100]，[1100010101101100]，[0011101010010011]，[0011101001010011]，[0011100101110100]，[0011011010100011]，[0011010110100011]，[0010111010011100]。 The method of claim 31, wherein The first sequence or the base sequence corresponding to the first sequence includes 7 or more '01' and / or '10' that are not overlapped with each other; or, the first sequence or the base sequence corresponding to the first sequence includes 7 or more transitions of '01' and / or '10' that are not overlapped with each other. The method according to claim 31 or 37, characterized in that The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0110010010101110]，[1001101101010001]，[0100111010011010]，[0101100111010001]，[0101110001101001]，[0101110100110001]，[0110001110100101]，[0110010101100011]，[0111001010110010]，[0111010001101001]，[0111010100101100]，[1000101011010011]，[1000101110010110]，[1000110101001101]，[1001101010011100]，[1001110001011010]，[1010001011001110]，[1010001110010110]，[1010011000101110]，[1011000101100101]，[0010101100110110]，[0010101101100110]，[0010101110010110]，[0010110010111001]，[0010110011100101]，[0010110011101010]，[0010111001011001]，[0010111001100101]，[0010111001101001]，[0010111001101010]，[0011001110100101]，[0011001110101001]，[0011010010101110]，[0011010101100110]，[0011011001010110]，[0011011010100110]，[0011100101011001]，[0011101001011001]，[0011101001100101]，[0011101001101010]，[0100101011100110]，[0100101100111010]，[0100110100111010]，[0100110101001110]，[0100111001101010]，[0101001100111010]，[0101011001001110]，[0101011001011100]，[0101011001101100]，[0101011001110010]，[0101011001110100]，[0101011011000110]，[0101011011001100]，[0101011100100110]，[0101011100110100]，[0101100110001011]，[0101100110100011]，[0101101000110011]，[0101101101000110]，[0101110010110010]，[0101110011001010]，[0101110011010010]，[0110001010110110]，[0110001011001011]，[0110001011101001]，[0110010100101110]，[0110010101101100]，[0110010110001011]，[0110010110100011]，[0110011010101100]，[0110011010110100]，[0110011011010100]，[0110100101011100]，[0110100110001011]，[0110100111010100]，[0110101001101100]，[0110110010101100]，[0110110011010100]，[0110110101000110]，[0111001001101010]，[0111001010100110]，[0111001101000101]，[0111010001100101]，[0111010010100110]，[0111010011010100]，[0111010100100110]，[1000101011011001]，[1000101100101011]，[1000101101011001]，[1000101110011010]，[1000110010111010]，[1000110101011001]，[1000110110010101]，[1001001010111001]，[1001001100101011]，[1001001101010011]，[1001010110010011]，[1001011000101011]，[1001011001110100]，[1001011010100011]，[1001100100101011]，[1001100101001011]，[1001100101010011]，[1001101001011100]，[1001101001110100]，[1001101010010011]，[1001101011010001]，[1001110100010110]，[1001110100110100]，[1001110101001001]，[1010001100101101]，[1010001100110101]，[1010001101001101]，[1010010010111001]，[1010010111001100]，[1010011001011100]，[1010011001110100]，[1010100011001011]，[1010100011011001]，[1010100100110011]，[1010100100111001]，[1010100110001011]，[1010100110001101]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110011000101]，[1011000110010101]，[1011001010110001]，[1011001011000101]，[1011010011000101]，[1011010100011001]，[1100010110010101]，[1100010110011010]，[1100010110100110]，[1100011010100110]，[1100100101011001]，[1100100110101001]，[1100101010011001]，[1100101101010001]，[1100110001010110]，[1100110001011010]，[1101000110010101]，[1101000110010110]，[1101000110011010]，[1101000110100110]，[1101001100010101]，[1101001100011010]，[1101001101000110]，[1101010001101001]，[1101010010011001]，[1101010011001001]，[0010101100101110]，[0011010100110110]，[0011011001101010]，[0101001100101110]，[0101100011001011]，[0101101000111001]，[0110010110101100]，[0110011101010010]，[0110101000110011]，[0111010011001010]，[1000101100110101]，[1001010111001100]，[1001100010101101]，[1001101001010011]，[1010010111000110]，[1010011100110100]，[1010110011010001]，[1100100110010101]，[1100101011001001]，[1101010011010001]，[0010110101100110]，[0011001101101010]，[0011101010010110]，[0101001011100110]，[0101100101110010]，[0101101000111010]，[0101110001011010]，[0110001011011010]，[0110001101101010]，[0110010011101010]，[0110010101001110]，[0110011101001010]，[0110100010111001]，[0110100111000101]，[0110100111010001]，[0110101011001100]，[1001010100110011]，[1001011000101110]，[1001011000111010]，[1001011101000110]，[1001100010110101]，[1001101010110001]，[1001101100010101]，[1001110010010101]，[1001110100100101]，[1010001110100101]，[1010010111000101]，[1010011010001101]，[1010110100011001]，[1100010101101001]，[1100110010010101]，[1101001010011001]，[0011001101010110]，[0011010110100110]，[1100101001011001]，[1100110010101001]。 The method of claim 36, wherein In the first PPDU, signals before the first sequence are all 1 corresponding signals. The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 18. The method of claim 40, wherein The first sequence or the first sequence corresponding to the base sequence includes one or more of the following sequences: [011001010110111000], [100110101001000111], [111000100101011001], [000111011010100110], [101001011100010011], [000101110110101100], [000110110111010100], [000111001101101010], [000111010110110010], [000111011011001010], [000111011100101100], [001101001110111000], [001101011000101110], [001101011011101000], [001110010010111010], [010010010111001110], [010010011100111010], [010011011100011010], [010100110110111000], [010101101100111000], [010110110001000111], [010110110010001110], [010111010010011100], [011001011010001110], [011001110001011010], [011011000101011100], [011011010001001110], [011100010011011010], [011100010011101001], [011100010101101100], [011100010110100110], [011100011010001011], [011100011100100101], [011100101000101110], [011100111010010010], [011101000110101100], [011101001001011100], [100010111001010011], [100011100100110101], [100100101011100011], [100101110100110001], [100110001110100101], [100111001010001011], [100111010001001011], [101000111001100101], [101001001101110001], [101001011011100011], [101001100101011100], [101001110010011100], [101001110100101011], [101001110110010011], [101001110110101100], [101001110111010100], [101001110111011010], [101001110111100101], [101001110111101100], [101001110111110011], [101001110111110100], [101001110111111001], [101001110111111010], [101001110111111011], [101001110111111100], [101001110111111101], [101001110111111110], [101001110111111111], [101001110111111112], [101001110111111113], [101001110111111114], [101001110111111115], [101001110111111116], [101001110111111117], [101001110111111118], [101001110111111119], [101001110111111120], [101001110111111121], [101001110111111122], [101001110111111123], [101001110111111124], [101001110111111125], [101001110111111126], [101001110111111127], [101001110111111128], [101001110111111129], [101001110111111130], [101001110111111131], [101001110111111132], [101001110111111133], [101001110111111134], [101001110111111135], [101001110111111136], [101001110111111137], [101001110111111138], [101001110111111139], [101001110111111140], [101001110111111141], [101001110111111142], [101001110111111143], [101001110111111144], [101001110111111145], [101001110111111146], [101001110111111147], [101001110111111148], [101001110111111149], [101001110111111150], [101001110111111151], [101001110111111152], [101001110111111153], [101001110111111154], [[101001001110100011]，[101001011001000111]，[101001011100011001]，[101001110001001101]，[101010001101100011]，[101010010011100011]，[101100100011100101]，[110001010110100011]，[110001011010100011]，[110001100100101011]，[110001101000101101]，[110001101010010011]，[110001101100010101]，[110001101101000101]，[110001110010010101]，[110010001011010011]，[110010001110100101]，[110010010101110001]，[110010110001000111]，[110100011010010011]，[110100101000100111]，[110101000101100011]，[110101001001100011]，[110101001001110001]，[111000100010110101]，[111000100010110110]，[111000100011011010]，[111000100101001101]，[111000100110100101]，[111000101001001101]，[111000101010010011]，[111000101100101001]，[111000110010010101]，[111001000101001011]，[111010001001010011]，[111010010010001110]，[001101011010001110]，[001101101010001110]，[001110001010110110]，[001110101000110110]，[010001110011011010]，[010100110110001110]，[011000110100101110]，[011000110101110100]，[011001101011100010]，[011010001101110001]，[011011000111001010]，[011011010001000111]，[011011010100011100]，[011100010010010111]，[011100011011000101]，[011100100010110110]，[011101000101001110]，[011101001010001110]，[100010110110001101]，[100011100100101011]，[100011101010010011]，[100011101100010110]，[100011101100100101]，[100100111000110101]，[100100111010100011]，[100101001110001011]，[100111011001010001]，[101000101101100011]，[101000110001101101]，[101001011100110001]，[101011000111001001]，[101011001001000111]，[101101100011000101]，[101101101000110001]，[101110001100100101]，[110001010010110011]，[110001010111001001]，[110001101000101011]，[110001101010001011]，[110001110101001001]，[110010100100010111]，[110010100110001011]，[110011010010100011]，[110100010010100111]，[110100010011100011]，[110100010100111001]，[110100010101100011]，[110100110001000111]，[110101000111001001]，[110110010010100011]，[111000100010101101]，[111000100011010011]，[111000100100110101]，[111000101001011001]，[111000110010001011]，[111001010010001011]，[000110110101110100]，[000110111010110100]，[001010110110011100]，[001010111000110110]，[001010111011011000]，[001011010111011000]，[001011101011000110]，[001011101011011000]，[001110011011010100]，[001110100011010110]，[001110100100101110]，[010001110101100110]，[010011011010111000]，[010100111000110110]，[010110001110110010]，[010110011010001110]，[010110110011100010]，[011000111010001101]，[011001010110001110]，[011001110001010110]，[011010001011001110]，[011010001110001011]，[011010001110110001]，[011010100011100110]，[011010110001011100]，[011010111000100110]，[011011000111010100]，[011011100011000101]，[011100010100101110]，[011100010110101100]，[011100011011001010]，[011100100100101110]，[011101000110001101]，[011101001001001110]，[011101001011000110]，[100010100110111001]，[100010100111011001]，[100011000101101101]，[100011001011101001]，[100011001110100101]，[100011011100010110]，[100011100101001101]，[100011101001100101]，[100100101011000111]，[100100111000101011]，[100101001100010111]，[100101001101000111]，[100101001110100011]，[100101110010001110]，[100110111000101001]，[100110111001010001]，[101000110001110110]，[101000110011100101]，[101000110100100111]，[101000110110001110]，[101001001110001110]，[101001100101110001]，[101001100111000101]，[101001101001000111]，[101001110001100101]，[101001110011000101]，[101010001110010011]，[101010010011000111]，[101011010001000111]，[101100010111000110]，[101100011000101110]，[101100011010001011]，[101100011011010001]，[101100011100010110]，[101100100101000111]，[101100101001000111]，[101100101001110001]，[101101000100011011]，[101101000100011101]，[101101000100111001]，[101101000101100011]，[101101010001000111]，[101110001001001011]，[110001000111010011]，[110001001011001011]，[110001001101001011]，[110001010110001101]，[110001011100100101]，[110001011100101001]，[110001110010001011]，[110010001110001011]，[110010010101100011]，[110010010110001011]，[110010011100010101]，[110010100010111001]，[110010100110100011]，[110010100111010001]，[110010101001000111]，[110010110100010011]，[110100010011000111]，[110100010100100111]，[110100010110001101]，[110100011001010011]，[110100011100010011]，[110100100010111001]，[110100100011100011]，[110100100100011101]，[110100101100100011]，[110100110100100011]，[110101000100100111]，[111000100011001011]，[111000100101010011]，[111000100101100101]，[111001001000101011]，[111001001010001011]，[111001001011000101]，[111010001100101001]，[011100010110011010]，[100111010001010011]，[101001001110001101]，[101001100011100101]，[101011001001110001]，[101100011100100101]，[101110001000101101]，[110001010010011011]，[110001110001001011]，[110010001101001011]，[110010111000100011]，[110100010110001110]，[110100011100010110]，[110100011100101001]，[110100101100010011]，[110110001000101101]，[011100011010100110]，[011100110100010110]，[110001011001010011]。， The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 20. The method of claim 42, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [00101101011100010011], [01101011010001000111], [11000111010001001011], [00110111000101001011], [11001000111010110100], [11001011010001000111], [00011011011000101011], [00011101110100101001], [00011101110100101100], [00101011100100100111], [00101101110001011100], [00101101110100011100], [00110100101110111000], [00111010001110110100], [10010100101110111000], [11000101110001001011], [11010010001011100011], [11010010001110100011], [11010010100011101100], [11010100011011011000], [11100010001011010011], [11100010001011010110], [11100100100111010100]. The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 22. The method of claim 44, wherein The first sequence or the first sequence corresponding to the base sequence includes one or more of the following sequences: [0011010010101110111000], [0011101101001000101110], [0011101110100011010010], [0100101100010111011100], [0100101110100011001110], [0101001001101110001110], [0101100101110010001110], [0110001001110101110100], [0110100111000100010111], [0110110001110001010110], [0111000100010111001011], [0111000100111010011010], [0111000100111010110100], [0111000101001011101100], [0111000111010001001011], [0111000111011001001010], [0111010001100010110110], [1000110111001010001011], [1000110111001101000101], [1000111010010100011011], [1001010111000100100111], [1001011011000101000111], [1001110001011100100101], [1001110110100010100011], [1010110100010011000111], [1010110110010001110001], [1011000100101011100011], [1011010001100111000101], [1011010011101000100011], [1011010100010011000111], [1011100010010110001011], [1100010001011100101101], [1100011001011010001011], [1100011101010010001101], [1100100101010001110011], [1100101100011010100011], [1100101101010001000111], [1100110001011010001011], [1100110011010001010110], [1100110100010111000111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [110011[1101001000101011100011]，[1101001000111000101110]，[1101010010010011000111]，[1110001000101011010011]，[1110001010001101101001]，[1110001011000101001101]，[1110001011001010001101]，[1110001101010001001101]，[1110001110010010010101]，[1110010010011000101011]，[1110011000101101000101]，[1110100010001110010110]，[0001011101110010110100]，[0001110111010100101100]，[0010110100111011101000]，[0010110101110010001110]，[0010111001011011100010]，[0010111010110001001110]，[0010111010111001000110]，[0011011100010100101110]，[0011100101101000101110]，[0100011101101001110100]，[0100110100011101110010]，[0100111011100010110010]，[0101110001000110110110]，[0110001010111000110110]，[0110001011100011010110]，[0110010010101110001110]，[0110100100010111011100]，[0110100101110010001110]，[0110101110001000110110]，[0110110001110101000110]，[0110110100011000101110]，[0111000100111010010110]，[0111000101100101001110]，[0111000111010100100110]，[0111001000111000101101]，[0111001100010111010010]，[0111010001001011011100]，[0111010001110001001011]，[0111010010010001101110]，[0111011000100100101110]，[1000101110011101001001]，[1000110011101000101101]，[1000111000100110110101]，[1000111010001001011011]，[1000111010010001101011]，[1000111011101000110100]，[1001001011100111010001]，[1001001110011101000101]，[1001110100100101000111]，[1010001001110011100101]，[1010001010011100100111]，[1010001011010001100111]，[1010001101100111000101]，[1010001101110001100101]，[1010001110010100100111]，[1010001110011000101101]，[1010001110011011000101]，[1010011000111011000101]，[1010100100100111000111]，[1010110001110001001101]，[1010110010001011000111]，[1011000100011101001101]，[1011000111001000101110]，[1011001000101011000111]，[1011001000110101000111]，[1011001000111000110101]，[1011001010001101000111]，[1011001010110001000111]，[1011001110001000101101]，[1011010001011100011001]，[1011010001011100110001]，[1011010011000100010111]，[1011010011100010001011]，[1100010011010110100011]，[1100010011101001001011]，[1100010101100011010011]，[1100010110010100011011]，[1100010110011010100011]，[1100011000101011001011]，[1100011001010110001011]，[1100011010001001011011]，[1100011010100010110011]，[1100011011010010001011]，[1100011100100100101011]，[1100011101000100101101]，[1100011101010001001011]，[1100100100011101010011]，[1100100110100101000111]，[1100101010010011100011]，[1101000101001110010011]，[1101000110100100011101]，[1101000110101001100011]，[1101000111000100100111]，[1101001000100111000111]，[1101001000101110001110]，[1101001010001100100111]，[1101001101010001100011]，[1101001110100010001110]，[1101010001100100100111]，[1101010010010011100011]，[1101100010100101110001]，[1101100010100110100011]，[1101101001000101110001]，[1110001000110101001101]，[1110001001100101001011]，[1110001001101000110101]，[1110001010010010111001]，[1110001010010110010011]，[1110001010110001001101]，[1110001100100100101011]，[1110001110010001001011]，[1110010001011001010011]，[1110010010001110001011]，[1110010010001110101001]，[1110010011000101001011]，[1110010011100101000101]，[1110010100110010001011]，[1110100010001100101101]，[0010110001011101110001]，[0011011101001010001110]，[0011101110100010010110]，[0110001011011010001110]，[0110101000111000110110]，[0110101100011101000110]，[0110110001000111010110]，[0110110001010111000110]，[0110110110001000111010]，[0111000101101101000110]，[0111001000110101110100]，[0111010001001110001101]，[0111010001100101001110]，[0111010010100011101100]，[1000101110011100100101]，[1001001110010100010111]，[1001100011101000101101]，[1010001011001110110001]，[1010001011100111001001]，[1010010011100111010001]，[1010011100111001000101]，[1011001000111000101101]，[1011001011100010001101]，[1011010001000111001101]，[1011010001110001001101]，[1011010001110001001110]，[1011010010001011100011]，[1011100010010001011011]，[1100010100010110111001]，[1100010101100110100011]，[1100010110101100100011]，[1100011100100101010011]，[1100011101010010010011]，[1100100011100101010011]，[1100100100101011000111]，[1100100100101011100011]，[1100100111001010001011]，[1100101001101000100111]，[1100101010011100010011]，[1100101011100010010011]，[1100101100101001000111]，[1100111000101010010011]，[1101000100101101100011]，[1101000100110010100111]，[1101000101001110110001]，[1101000101101000110011]，[1101000101101001100011]，[1101001001011100100011]，[1101001010011001000111]，[1101001011100010001101]，[1101011000100101110001]，[1101101000100100011101]，[1110001001010011010011]，[1110001100100010101101]，[1110001100100010110101]，[1110001101000100110101]，[1110010010100111000101]，[1110100010100111001001]，[1010010011101000111001]，[1011000100011101001011]，[1101101001000101100011]。， The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 24. The method of claim 46, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [000110110001011010111010], [000110110011100101101010], [001011011100111010001010], [001101101011010001000111], [001110111001010100110100], [011010100011100010011011], [011100010111001000101101], [100010111010010100111001], [100011000101110110110100], [100011101000110111010010], [100011101100100100101011], [100100101110001100010111], [100101100011011000101011], [100110100110101001000111], [100111001010010111010001], [101001010111000110010011], [101011101001000110110001], [101101001000110001011101], [101101001110010001000111], [110001000110101011001011], [110001010100111010010011], [110001110010001010110110], [110010001011100011010110], [110010010100101110111000], [110100100011011000111010], [110100100100010111001110], [110101000110110001101001], [110101001001001101110001], [110110100100011000101110], [111000101001010011011001], [111001000100011101001011], [111001001110100101000101], [000101110111010100101100], [000110011011101010010110], [000110110011100101010110], [000110110011100101101010], [000110110011100101101101], [000110110011100101110001], [000110110011100101110011], [000110110011100101110100], [000110110011100101110101], [000110110011100101110110], [000110110011100101111001], [000110110011100101111010], [000110110011100101111011], [000110110011100101111100], [000110110011100101111101], [000110110011100101111110], [000110110011100101111111], [000110110011100110001011], [000110110011100110001100], [000110110011100110001101], [000110110011100110001110], [000110110011100110010011], [000110110011100110010100], [000110110011100110010101], [000110110011100110010110], [000110110011100110011011], [000110110011100110011100], [000110110011100110011101], [000110110011100110011110], [000110110011100110100011], [000110110011100110100101], [000110110011100110100110], [000110110011100110100111], [000110110011100110101011], [000110110011100110101100], [000110110011100110101101], [000110110011100110101110], [000110110011100110101111], [000110110011100110110001], [000110110011100110110011], [000110110011100110110100], [000110110011100110110101], [000110110011100110110110], [000110110011100110110111], [000110110011100111001011], [000110110011100111001100], [000110110011100111001101], [000110110011100111001110], [000110110011100111[001001101110001110100101]，[001001110010110001010111]，[001001110111000111010010]，[001100101110101101011000]，[001110001001101101011010]，[001110001001101101101010]，[001110010011101101000101]，[010100101110001110110010]，[010100110001101101110100]，[010100111000101110110010]，[010101101101100100011100]，[010110011100100100010111]，[010110100011100010011011]，[010110100011101000100111]，[010110101001101100111000]，[010110101110001000100111]，[010111000110110001001011]，[010111010010001101100011]，[011000110101101000101110]，[011001100101110101101000]，[011010010101110110011000]，[011010010110001011101100]，[011010011101000100011011]，[011011000110100111010100]，[011011010100010011100011]，[011100111010001001001011]，[100100101110010101000111]，[100100111011010001010011]，[100101001100101110001011]，[100101010001110100100111]，[100101100010111000100111]，[100110010010110101000111]，[101000111001001110110100]，[101001010110010011000111]，[101001011100011101100100]，[101001100011011011101000]，[101010001101001110010011]，[101010010010011011100011]，[101010010110010011000111]，[101011000101100100011101]，[101011010011000100010111]，[101100100010111000110101]，[101100110010100101000111]，[101101000111000100011011]，[101101001000101110110001]，[101101001000111010001101]，[101110001001101000110101]，[101110100011000100101101]，[110001110110010010010101]，[110010101000111010010011]，[110011010001010010100111]，[110100010100101110010011]，[110100011101001100101001]，[110100101011001000111001]，[110100101110001000100111]，[110110001000110100110101]，[110110001000111000101101]，[110110010001110001011010]，[111000101001010011001101]，[111000101011010010011001]，[111000101011010011001001]，[111000110010011010010101]，[111001000111010001101001]，[111001001001100011010101]，[111001001011000101010011]，[111001001011100010101001]，[111001100100010101101001]，[111010001100011101001001]，[111010010100010110011001]，[000101101011101001100110]，[000101110100110011100101]，[000101110101101001100110]，[000101110110110001100101]，[000101110111001101001010]，[000110101101011101001100]，[000110110100011101010110]，[000110110110011100101010]，[000110111000101110010110]，[000110111001010110010110]，[000110111010001110100101]，[000110111010011010100110]，[000110111011100010100101]，[000110111011100010110100]，[000111001101100101011010]，[000111001101100101101010]，[000111010100101100110110]，[000111010100101101100110]，[000111010101100010110110]，[000111010110011010110100]，[000111010110101100100110]，[000111011101001010010011]，[000111011101100011010010]，[000111011101100101001010]，[001001011011100111010001]，[001001101110001110101001]，[001001110111001011001010]，[001001110111010001101001]，[001010111001001110010110]，[001010111011001011000110]，[001011001010100111011100]，[001011010001110111011000]，[001011010100110111000110]，[001011010110011010111000]，[001011011101100011001010]，[001011100010110011010110]，[001011101001010011100110]，[001011101001100111001010]，[001101001010111011101000]，[001101010111000101101100]，[001101010111001011011000]，[001101011101001000110110]，[001101100010110101110100]，[001101100011010011101010]，[001101100111000101011010]，[001101101000110101011100]，[001101101000111010101100]，[001101110011010001011010]，[001101110100011010010110]，[001101110100011100101001]，[001110001101110101001001]，[001110101011000101101100]，[010001011100111011010010]，[010001110110010111001010]，[010010101110001110110010]，[010010110001101110111000]，[010010110111000101110010]，[010010110111001110100010]，[010010110111010001001110]，[010010111000111011100100]，[010011001101011010111000]，[010011011100011101001010]，[010011100111010001011010]，[010011101000111011010010]，[010100010110111001001110]，[010100010111001110110100]，[010100101001101110111000]，[010100101100111011101000]，[010100110001101110110100]，[010100110100111011100100]，[010101001110011011011000]，[010101101001101100111000]，[010110001100110100010111]，[010110010110001000110111]，[010110100010110011101100]，[010110101000111001101100]，[010110101101100100011100]，[010111010110100011011000]，[011000110100110111010100]，[011000111011001010110100]，[011001001101011010111000]，[011001010110010111011000]，[011001011001010110111000]，[011001100101101011101000]，[011001101101001010111000]，[011001110010100101110100]，[011010011010100111011000]，[011010011100100111010100]，[011010101001110011011000]，[011010101110001011011000]，[011010110001110100010011]，[011010110011010001110100]，[011011000100101110101100]，[011011001101001010111000]，[011011010001101010111000]，[011011010001110011101000]，[011100010011011011010100]，[011100100010111011010010]，[011100100111011010001010]，[011101000101101011000110]，[011101000110001001011011]，[100010111001110110100100]，[100011011000100101110101]，[100011011101000100101101]，[100100101011101100011100]，[100100110010110101000111]，[100100111001011000101011]，[100101001110001011101100]，[100101010110001100100111]，[100101011100011101100100]，[100101100010111011100100]，[100101100101011000100111]，[100101101001110100010011]，[100101101010001001100111]，[100110001101011010001011]，[100110011010010100010111]，[100110101001101000100111]，[100110110010100101000111]，[100111000100110101001011]，[100111001001101000101011]，[100111001011001000101011]，[101000101001011100100111]，[101000101101110010011100]，[101001010001110111011000]，[101001010010011011100011]，[101001011100010111011000]，[101001011101000110001101]，[101001011101001100010011]，[101001100011011101101000]，[101001101001110111001000]，[101010110001100100100111]，[101011000110011010001011]，[101011000111010001001101]，[101011001011000100011011]，[101011001110010001001011]，[101011001110010010001011]，[101011010001110001001101]，[101011010110010001000111]，[101011101000110001001011]，[101100010111000100101101]，[101100011000101110100101]，[101100100011100010101101]，[101101000100111010001110]，[101101010001110001001101]，[110001101100010010111010]，[110010001011100101101001]，[110010010111000101010011]，[110010010111001010100011]，[110010011000111010100101]，[110010011100101100010101]，[110010011101001010001011]，[110010100010110111001001]，[110010101000110100100111]，[110010110101000100010111]，[110100010010011100110101]，[110100010110011000110101]，[110100010110101100011001]，[110100100010011100110101]，[110100100011000101110101]，[110100101001100101000111]，[110100110101011000100011]，[110101000100110100111001]，[110101000101100100111001]，[110101000110100111001001]，[110110001000101110010110]，[110110001101001110101000]，[110110010001110001010110]，[111000100010011010110101]，[111000100010011100101101]，[111000100101011001011001]，[111000101001100101001011]，[111001000100011101011010]，[111001000101100101011001]，[111001000101110001011010]，[111001000110101001101001]，[111001001100011010010101]，[111001001100011010101001]，[111001010010100010110011]，[111010001000101011010011]，[111010001000110010110101]，[111010001001001110011010]，[111010001010010110011001]，[111010001011001100011010]，[111010010001001110011010]，[111010100011010011100100]，[111011000100011010011010]，[000101011100101100011011]，[000101101110110001100101]，[000110110100111010101100]，[000111011010100110100110]，[001010110110110010001110]，[001011011011101000110001]，[001011011100100111000101]，[001011101011010001101100]，[010011011101000111001010]，[010101101001110011011000]，[010110100010111001110010]，[011000110110010111010100]，[011010011101000111011000]，[101010010110001100100111]，[110001110110010010100101]，[111000110010011010100101]，[010100111001100101110100]，[100110011010001010010111]，[101001110011001011101000]。， The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 26. The method of claim 48, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [01101001000110111010001110], [01110001011101100010010110], [01110001110010001010110110], [01110100011000111011010010], [10001011100111000100101101], [10100101100011101000100111], [10100101110010111000100011], [10110001001011101000111001], [10110001101101000101000111], [10110010001110001110100101], [10111000110001011100100101], [11000100011101001110100101], [11000110011101000101001011], [11000111001010110010001011], [11010010010111010001100011], [11010010100010111001100011], [11011000110110100010100011], [11100010001101010011010011], [11100100010101100011010011], [11100100011011010001010011], [11101000110100011001010011], [01001011011100011000101110], [01100010111011100010110100], [01110001001011011000101110], [01110001011011010001001110], [01110001101101001000101110], [01110010001101011100010110], [10010110100111000100010111], [10011100010111001000101101], [10100011100101101000100111], [10100101110001110110010001], [10110001100011101000101101], [10110001110001011100100101], [10111001101101000101000111], [11000101101101000101000111], [11000110001101001110100101], [11000111001101000101000111], [11010001101101000101000111], [11010010001101001110100101], [11010010100010111001100101], [11011000110110100010100101], [11100010001101001110100101], [11100100010101100011000101], [11100100011011010001000101], [11101000110100011001000101], [01001011011100011000101101], [01100010111011100010110101], [01110001001011011000101101], [01110001011011010001001101], [01110001101101001000101101], [01110010001101011100010101], [10010110100111000100010101], [10011100010111001000101101], [10100011100101101000100101], [10100101110001110110010001], [10110001100011101000101101], [10110001110001011100100101], [10111001101101000101000111], [11000101101101000101000111], [11000110001101001110100101], [11000111001101000101000111], [11010001101101000101000111], [11010010001101001110100101], [11010010100010111001100101], [11011000110110100010100101], [11100010001101001110100101], [11100100010101100011000101], [11100100011011010001000101], [11101000110100011001000101], [01001011011100011000101101], [01100010111011100010110101], [01110001001011011000101101], [01110001011011010001001101], [01110001101101001000101101], [01110010001101011100010101], [100101101[10110010100011100010011101]，[10110100011000111010001011]，[11000100111010100110100011]，[11000101110010110010100011]，[11000101110100101000110011]，[11000110110001010001011011]，[11001000101011100011010011]，[11001000111010010110001011]，[11001010010011101001000111]，[11001010100011100100100111]，[11001011000110101000100111]，[11001011001010110001000111]，[11001100010010110100010111]，[11010001001010110011100011]，[11011010001010001101100011]，[11011100010001011000101101]，[11100010001011101001010011]，[11100010100011011010010011]，[11100010100110100100011011]，[11100010110001011001010011]，[11100100100111000101010011]，[11101000101001000110100111]，[11101001000101001110010011]，[00101101000111011101000110]，[01101000111010110001001110]，[01101001011101000110001110]，[01101101010001001110001110]，[01110001100010111010010110]，[01110001101011001000101110]，[01110010001011011010001110]，[01110010001110100100101110]，[01110011000101101000101110]，[01110100010010110110001110]，[01110100010110100011001110]，[01110100011011010010001110]，[01110101001110001001001110]，[10001001101110001110100101]，[10100100101110100011000111]，[10100100111000111010001101]，[10100100111010001100011101]，[10100100111010001110001101]，[10100101110001110001001101]，[10101100100011100010010111]，[10110001100011010001011101]，[10110100010011101000111001]，[10110100010100011101100011]，[10110100010111000110001101]，[10110100100011100111010001]，[10111001000111000101001101]，[10111010001011000110001101]，[11000101000101101100011011]，[11000101001101001110100011]，[11000101100101011100100011]，[11000110001011101001001011]，[11000110111000101000101101]，[11001000111010100011010011]，[11001001011011000101000111]，[11001001110010100010010111]，[11001010001011011000100111]，[11001010010111010001000111]，[11001010011000101100010111]，[11001010011010001101000111]，[11001011000101011100010011]，[11001011000111010100010011]，[11001100010100101110100011]，[11001100011101000101001011]，[11010001011010011000100111]，[11010001101001011100010011]，[11010001110001101010010011]，[11010010100010111000110011]，[11011000100101100101000111]，[11100010100010110110001101]，[11100011000101110100100101]，[11100100010111000110100101]，[11100100011001011010001011]，[11100100100110001010100111]，[11100101001000110100010111]，[11100101010001100100100111]，[11101000100011100101101001]，[11101000101100010010100111]，[11101000101101001000110011]，[11101001000111000100110101]，[01110100100101110001001110]，[10110001011100011100100101]，[11001001010110001110001011]。， The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 28. The method of claim 50, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [1110001010100111001001001101]，[1110101000100101110010011100]， [0001011101011010110001101100]，[0001011101011100101011011000]， [0001011101101010010011100011]，[0001101100110101101011101000]， [0001101101100011101010110100]，[0001101110001101001101010110]， [0001110101011000110110110010]，[0001110101110010001101101001]， [0001110110101001110010110010]，[0010011011100010101101011100]， [0010110111010010001110100011]，[0010111010001011010011100110]， [0010111011001001010110001110]，[0011001110100010111001011010]， [0011001110100101101000101110]，[0011001110101101001011101000]， [0011010111010110100011011000]，[0011100010110101001101110100]， [0011100011011010100100010111]，[0011100100111010010001010111]， [0011100101011101000100100111]，[0011100101110010010111010100]， [0011101000101110111001010010]，[0011101000110111010110010100]， [0011101011010100011101100100]，[0011101011100100011010010110]， [0100010111011000111001011010]，[0100011010110111010001110100]， [0100101101110100010111001100]，[0101001011101001101110011000]， [0101011000110110110010111000]，[0101011100111001001001110100]， [0101101001110001101110100010]，[0101101110001101000100010111]， [0110100100111011000101000111]，[0110100101100010011101011100]， [0111000101000110111011010010]，[0111000110101001001101110100]， [0111010001001110001101001011]，[1000101110100101101000110011]， [1000101110110001110010110100]，[1000111001010110110010001011]， [1000111001010110110100010011]，[1000111010111001000100101101]， [1001001011100110001010100111]，[1001010100110100111000100111]， [1001011001010100111001000111]，[1001110011010100100100010111]， [1010001110010001101101110100]，[1010001110010110110100010011]， [1010010010111011000101100011]，[1010010110001110010001011101]， [1010100011000110110110001011]，[1010110010110010001100010111]， [1010110100010110010001100111]，[1010110100110001100100010111]， [1011001001001110010101000111]，[1011001011000110101001000111]， [1011010010001011101000110011]，[1011010010011100010100011011]， [1011010010011101100010100011]，[1011010100011100010010011011]， [1011010110001000101110100011]，[1100010100011011100101101001]， [1100010100101011100010011011]，[1100010111001000101001101011]， [1100011010100010111011011000]，[1100011101001010110010001011]， [1100100010110110101001110001]，[1100100011010011101010001011]， [1100110001010010110100010111]，[1100110001011101000110100101]， [1101000100110101001011100011]，[1101000101001101001110110001]， [1101000101011100101100010011]，[1101000101101001010001100111]， [1101000101110100101100011001]，[1101001000101101110001011100]， [1101010010100011100010011011]，[1101011001010001001110100011]， [1101100010100101001101000111]，[1101100100011100010100101011]， [1101100100011101010010100011]，[1101100100100011100010101101]， [1110001001110010101001101001]，[1110001011001001001110010101]， [1110001011001010010100011011]，[1110010001110010110010101001]， [1110010010001011101010011100]，[1110010010011100010101001011]， [1110010011001010010100010111]，[1110010011010001010010100111]， [1110010011100010100010010111]，[1110010011101001010001010011]， [1110010100010100101110010011]，[1110010100101000101100100111]， [1110100010010101101100011100]，[1110100010110100101000110011]， [1110100100010100011100100111]，[0001011100111011001011001010]， [0001011101101101010011000110]，[0001011101110100111000100101]， [0001101010111001100010110110]，[0001101011010111010011011000]， [0001101100011101011101101000]，[0001110101110011001001011010]， [0001110110001101010110010110]，[0010100110101110110001011100]， [0010110101011100011011011000]，[0010111001001001110011101010]， [0011001110100010111011010010]，[0011010011011101010010001110]， [0011011000101101011101011000]，[0011011101001001010110001110]， [0011100011101100100101011010]，[0011100101110010001011011010]， [0011101000111011010001001011]，[0101001011001110011011101000]， [0101001101001101110011101000]，[0101101001001100111010111000]， [0101101001110100010111001100]，[0101101101000100111010011100]， [0101110001101110010010001011]，[0110100011101011000100011011]， [0110101000110111011001011000]，[0111000110101001001011101100]， [0111001000110100110101110100]，[0111010001011010010111001100]， [1001001100101011100010100111]，[1001010111001000100110100111]， [1001100011010010111010001011]，[1010010001110010111011101000]， [1010010110001011101000110011]，[1010010110110011000101000111]， [1100010100011011100100101101]，[1100010111010001000110101101]， [1100011010001101110100100101]，[1100100010110110100111000101]， [1100100111010010100010100111]，[1100101100100010101101110001]， [1100110001011101000100101101]，[1101000100100111011000111010]， [1101000110110110001100010101]，[1101000111010001001010011101]， [1110001001010110001101001101]，[1110010110010001001110101001]， [1110011000101001011010001011]，[1110100010100101001100100111]， [1110100010100101001110010011]，[0001010111011010001101100011]， [0001011011101011100011011000]，[0001011101001011010111001100]， [0001011101100111001101001010]，[0001100111010110100101110100]， [0001101001101110110001010110]，[0001101011100010101100110110]， [0001101100010110101110101100]，[0001101100101110101101011000]， [0001101101010011101011101000]，[0001101101110100010101100011]， [0001110100110101101011100100]，[0001110100110110110001101010]， [0010011011011100011101010010]，[0010011011100011101011010100]， [0010011101011010110010111000]，[0010011101011100011011010010]， [0010011101110010100011101001]，[0010110100111000110111010001]， [0010111010110010110001001110]，[0010111011001010110100011100]， [0011011000110101101011101000]，[0011011100101100010101110100]， [0011101011100100011011010010]，[0100101011100011101101100100]， [0100101101100010011101011100]，[0100101101100011101011100100]， [0100110100111001010110111000]，[0101110001101001001011101100]， [0110101011001011000111011000]，[0110110100011001110101011000]， [1000110111001011001010001011]，[1000111011010100010011010011]， [1001011011000100111010111000]，[1001011100010100111011100100]， [1010100111001001001101000111]，[1011010010001001110101110001]， [1011100101001000101110001011]，[1011101000100111000110100101]， [1100010111000100101110110100]，[1100011100100101011011101000]， [1100100111001010010100010111]，[1100101000101001011100100111]， [1100110001011010010111010001]，[1101000100110110101001110001]， [1101001010100011100100100111]，[1101001011000111001000101110]， [1101100010001101011100010110]，[1101100010100011100100101101]， [1110010101000110011101001001]，[1110100010010010101100111001]， [0001101011101011010001101100]，[0010101101011100011101100100]， [0010111010010110101110011000]，[0100101101110110001010001110]， [0110001100101011011011101000]，[0110100110101011000110111000]。 The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 30. The method of claim 52, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [110011100010100010011101001011]，[110100010111001001010011100011]， [110100101110001100010001011101]，[110100101110010001010001110011]， [111001000110001011101001001011]，[111001010001101001001100010111]， [011010011101001000111010001110]，[101100010111000100011100101101]， [101101001110001000111010001101]，[110001011001000111011010100011]， [110001110010100100111010001011]，[110010010001110010101110001011]， [110100011101010011100010010011]，[110110001001110001101000101011]， [111010001100100101100010100111]，[011100010111000100101110010110]， [101001001011100011100010011101]，[101110010001110001110100100101]， [110001010110111000100110100011]，[110100100101110100011000100111]， [110101000101100011100100011011]，[101100010111000111000100101101]， [101101001000111000111010001101]，[111010001010011001000110100111]， [101011011010001000100111000111]，[111000111001000100010110110101]， [111001011000100110010100010111]，[101110001001110100010010010111]。 The method according to any one of claims 1 to 20, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 32. The method of claim 54, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [00011100111010001101110100100101]；[00101110100010110101101110011000]； [00110111010010100100111000111010]；[01000111011011100010110110001010]； [01011011010001001110100011000111]；[01011100011100100101001011101100]； [01100010011101011010011010111000]；[01110001110110010001001010010111]； [00010110101101110110010001110001]；[00011001110110101101000101110100]； [00011011010100111000101110100110]；[00011101011001011010111001000110]； [01010001101101000111011011100010]；[01100101110100011100101011011000]； [11100100101011000111010001011001]；[10001110001001101110110101101000]； [10100011100011011010110100010011]；[10100100101110110001011100111000]； [10111000100100011101001001110101]；[11001000101101011011000111000101]； [11010001011101001010010001100111]；[11100010100110100101000110111001]； [11100011000101110010001011011010]；[11100110001001010010111010001011]； [10011010001011100011010100100111]；[10011101100010100101100101000111]； [10101110010010111000100100011101]；[11101001010010001001101110001110]。 The method according to any one of claims 1 and 3 to 19, characterized in that, The length of the first sequence or a base sequence corresponding to the first sequence is an odd number. The method of any one of claims 1 to 56, characterized in that The first sequence or the base sequence corresponding to the first sequence is an m sequence. The method according to any one of claims 1, 3 to 19 and 56 to 57, characterized in that The length of the first sequence or a base sequence corresponding to the first sequence is 7. The method of claim 58, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1001011], [1001110]. The method according to any one of claims 1, 3 to 19 and 56 to 57, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 15. The method of claim 60, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [100010011010111], [100011110101100]. The method according to any one of claims 1, 3 to 19 and 56 to 57, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 31. The method of claim 62, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1000010010110011111000110111010]；[1000010101110110001111100110100]； [1000010110101000111011111001001]；[1000011100110111110100010010101]； [1000011010100100010111110110011]；[1000011001001111101110001010110]。 The method of any one of claims 1 to 56, characterized in that The first sequence or the base sequence corresponding to the first sequence is a gold sequence. The method of claim 64, wherein The gold sequence is associated with an m-sequence having a length of 7, 15 or 31. The method of claim 65, wherein The m-sequence comprises one or more of the following sequences: [1001011]；[1001110]；[100010011010111]；[100011110101100]； [1000010010110011111000110111010]；[1000010101110110001111100110100]； [1000010110101000111011111001001]；[1000011100110111110100010010101]； [1000011010100100010111110110011]；[1000011001001111101110001010110]。 The method according to any one of claims 1 to 66, wherein: The synchronization field is an AMP synchronization field; or The first device is an AP, and the second device is an AMP device; or The first device is an AMP device, and the second device is an AP. The method according to any one of claims 1 to 67, wherein: The first PPDU comprises a wideband part and / or a narrowband part, and the synchronization field is located in the narrowband part; or Each part in the time domain of the first PPDU occupies the same bandwidth; or The first PPDU does not contain a legacy preamble part; or The first PPDU only contains a narrowband part and does not contain a wideband part. The method according to claim 68, wherein: The first PPDU is a downlink PPDU, the first PPDU comprises a wideband part and / or a narrowband part, and the synchronization field is located in the narrowband part; or The first PPDU is a downlink PPDU, each part in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not contain a legacy preamble part, or the first PPDU only contains a narrowband part and does not contain a wideband part; or The first PPDU is an uplink PPDU, the first PPDU comprises a wideband part and / or a narrowband part, and the synchronization field is located in the narrowband part; The first PPDU is an uplink PPDU, each part in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not contain a legacy preamble part, or the first PPDU only contains a narrowband part and does not contain a wideband part. The method according to any one of claims 1 to 69, wherein: The first PPDU is a downlink PPDU, and the second device is an AMP device that communicates based on a backscattering communication mode or an active emission communication mode; or The first PPDU is an uplink PPDU, and the first device is an AMP device that communicates based on a backscattering communication mode or an active emission communication mode. The method of any one of claims 1 to 70, characterized in that The first PPDU comprises a fourth sequence, and the fourth sequence satisfies one or more of the following conditions: The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1001011], [1001110]. The first sequence or the base sequence corresponding to the first sequence has a length of 15. The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [100010011010111], [100011110101100]. The first sequence or the base sequence corresponding to the first sequence has a length of 31. The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The first sequence or the base sequence corresponding to the first sequence is a gold sequence. The gold sequence is associated with an m-sequence having a length of 7, 15 or 31. The m-sequence comprises one or more of the following sequences: The method according to any one of claims 1 to 66, wherein: The synchronization field is an AMP synchronization field; or The first device is an AP, and the second device is an AMP device; or The first device is an AMP device, and the second device is an AP. The method according to any one of claims 1 to 67, wherein: The first PPDU comprises a wideband part and / or a narrowband part, and the synchronization field is located in the narrowband part; or Each part in the time domain of the first PPDU occupies the same bandwidth; or The first PPDU does not contain a legacy preamble part; or The first PPDU only contains a narrowband part and does not contain a wideband part. The method according to claim 68, wherein: The first PPDU is a downlink PPDU, the first PPDU comprises a wideband part and / or a narrowband part, and the synchronization field is located in the narrowband part; or The first PPDU is a downlink PPDU, each part in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not contain a legacy preamble part, or the first PPDU only contains a narrowband part and does not contain a wideband part; or The first PPDU is an uplink PPDU, the first PPDU comprises a wideband part and / or a narrowband part, and the synchronization field is located in the narrowband part; The first PPDU is an uplink PPDU, each part in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not contain a legacy preamble part, or the first PPDU only contains a narrowband part and does not contain a wideband part. The method according to any one of claims 1 to 69, wherein: The first PPDU is a downlink PPDU, and the second device is an AMP device that communicates based on a backscattering communication mode or an active emission communication mode; or The first PPDU is an uplink PPDU, and the first device is an AMP device that communicates based on a backscattering communication mode or an active emission communication mode. The first PPDU comprises a fourth sequence, and the fourth sequence satisfies one or more of the following conditions: The fourth sequence comprises one or more continuous 01 or 10 sequences; The fourth sequence is used for clock calibration of the second device. The method of claim 71, wherein The fourth sequence is located in the synchronization field. The method of claim 71 or 72, wherein The fourth sequence is located before the first sequence in the time domain, or the fourth sequence is located after the first sequence in the time domain. The method of claim 71, wherein The fourth sequence is located in an information field of the first PPDU other than the synchronization field. The method of claim 74, wherein The information field where the fourth sequence is located is located before the synchronization field. The method of any one of claims 1 to 74, characterized in that, The synchronization field is the first information field of the first PPDU in the time domain. The method of any one of claims 1 to 76, characterized in that The first PPDU comprises a fifth sequence, and the fifth sequence satisfies one or more of the following: The fifth sequence is used to identify the starting position of the first sequence; The fifth sequence comprises continuous n 0s or continuous n 1s, n being a positive integer greater than or equal to 1; The fifth sequence is a sequence of all 0s or a sequence of all 1s, and the duration of the fifth sequence is greater than or equal to m microseconds, m being a positive integer greater than or equal to 1; The fifth sequence is a predefined sequence; The fifth sequence is located before the first sequence. The method of claim 77, wherein: n is greater than or equal to 3; or m is greater than or equal to 6 microseconds; or m is greater than the time length corresponding to 2 chips in a data field of the first PPDU; m is greater than or equal to the time length corresponding to 3 chips in a data field of the first PPDU; m is less than or equal to 9. The method of claim 77 or 78, wherein The fifth sequence is located in the synchronization field, or the fifth sequence is located in an information field of the first PPDU other than the synchronization field. The method of any one of claims 77 to 79, wherein: The fifth sequence is used to indicate one or more transmission parameters associated with the first PPDU; and / or The fifth sequence comprises a plurality of candidate sequences, each candidate sequence of the plurality of candidate sequences corresponding to one or more transmission parameters associated with the first PPDU, wherein different candidate sequences correspond to different transmission parameters. The method of claim 80, wherein The transmission parameters comprise one or more of the following: data rate, symbol length, transmission mode, waveform, and coding mode. The method of any one of claims 77 to 81, wherein The chip duration of the fifth sequence is related to the chip duration of a data field of the first PPDU. The method of claim 82, wherein The chip duration of the fifth sequence is equal to or not equal to the chip duration of the data field. The method according to claim 82 or 83, characterized in that The chip duration of the fifth sequence is the chip duration corresponding to the fifth sequence after coding. The method of any one of claims 77 to 84, wherein The coding mode of the fifth sequence is Manchester coding. The method of any one of claims 77 to 85, wherein The fifth sequence comprises continuous n 0s or continuous n 1s, and the value of n is related to the value of the first bit of the first sequence. The method of any one of claims 1 to 86, characterized in that The first PPDU comprises a sixth sequence, and the sixth sequence satisfies one or more of the following: The sixth sequence is used to identify the ending position of the first sequence; The sixth sequence comprises continuous t 0s or continuous t 1s, t being a positive integer greater than or equal to 1; The sixth sequence is a sequence of all 0s or a sequence of all 1s, and the duration of the sixth sequence is greater than or equal to p microseconds, p being a positive integer greater than or equal to 1; The sixth sequence is a predefined sequence; The sixth sequence is located after the first sequence. The method of claim 87, wherein: t is greater than or equal to 3; or, p is greater than a time length corresponding to 2 chips in a data field of the first PPDU; or, p is greater than or equal to a time length corresponding to 3 chips in the data field of the first PPDU; or, p is less than or equal to 9. The sixth sequence is located in the synchronization field, or the sixth sequence is located in an information field other than the synchronization field of the first PPDU. The method of claim 87 or 88, wherein The first sequence is used to indicate a chip duration of the sixth sequence. The method of any one of claims 87 to 89, wherein The method of any of claims 87-90, wherein: The sixth sequence is used to indicate one or more transmission parameters associated with the first PPDU; and / or, The sixth sequence comprises a plurality of candidate sequences, each of the plurality of candidate sequences corresponding to one or more transmission parameters associated with the first PPDU, wherein different candidate sequences correspond to different transmission parameters. The transmission parameters comprise one or more of: a data rate, a symbol length, a transmission mode, a waveform, a coding mode. The method of claim 91, wherein A chip duration of the sixth sequence is related to a chip duration of a data field of the first PPDU. The method of any one of claims 87 to 92, wherein The chip duration of the sixth sequence is equal to or not equal to the chip duration of the data field. The method of claim 93, wherein The chip duration of the sixth sequence is a chip duration corresponding to an encoding of the sixth sequence. The method according to claim 93 or 94, characterized in that The coding mode of the sixth sequence is Manchester coding. The method of any one of claims 87 to 95, wherein The sixth sequence comprises t consecutive 0s or t consecutive Is, and a value of t is related to a value of a last bit of the first sequence. The method of any one of claims 87 to 96, wherein The first sequence comprises a first sub-sequence, the first sub-sequence satisfying one or more of: The method of any one of claims 1 to 97, characterized in that The first sub-sequence is used to identify a starting position of the first sequence; The first sub-sequence comprises r consecutive 0s or r consecutive Is, r being a positive integer greater than or equal to 1; The first sub-sequence is an all-0 sequence or an all-1 sequence, and a duration of the first sub-sequence is greater than or equal to w microseconds, w being a positive integer greater than or equal to 1; The first sub-sequence is a predefined sequence; The first sub-sequence is located at a most front end of the first sequence. The method of claim 98, wherein: r is greater than or equal to 3; or, w is greater than or equal to 6 microseconds; or, w is greater than a time length corresponding to 2 chips in a data field of the first PPDU; or, w is greater than or equal to a time length corresponding to 3 chips in the data field of the first PPDU; or, w is less than or equal to 9. The first PPDU comprises a second sub-sequence, the second sub-sequence satisfying one or more of: The second sub-sequence is used to identify an ending position of the first sequence; The second sub-sequence comprises b consecutive 0s or b consecutive Is, b being a positive integer greater than or equal to 1; The second sub-sequence is an all-0 sequence or an all-1 sequence, and a duration of the second sub-sequence is greater than or equal to q microseconds, q being a positive integer greater than or equal to 1; The method of any one of claims 1 to 99, characterized in that, The second sub-sequence is a predefined sequence; The second sub-sequence is located at a last end of the first sequence. ​ ​ ​ ​ The method of claim 100, wherein: b is greater than or equal to 2 or 3; or, q is greater than a time length corresponding to 2 chips in a data field of the first PPDU; or, q is greater than or equal to a time length corresponding to 3 chips in a data field of the first PPDU; or, q is less than or equal to 9. The method of any of claims 1-19, wherein: the first sequence or a base sequence corresponding to the first sequence has a length of 16; and / or, the first sequence or the first sequence comprises 7 or more non-overlapping ‘01’ and / or ‘10’; and / or, the first sequence or the first sequence comprises 7 or more non-overlapping transitions of ‘01’ and / or ‘10’. the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: The method of claim 102, wherein the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: [0111010001011010]，[1001011010100011]，[0110100111010100]，[0101101000110011]， [1000101110100101]，[1010010101110001]，[0111000101011010]，[0110010110101010]， [0010101110010110]，[1010011010110001]，[0111000110011010]，[1001101001010101]， [0011001110100101]，[1010100110010110]，[0111001010011010]，[1010010111001100]， [0101011001101001]，[1100110001011010]，[1000110101100101]，[1010010111010001]， [0101100101001110]，[1101010001101001]，[1000111001100101]，[1010011001110001]， [0101101010001110]，[0011100110010110]，[1000111010100101]，[1010101001011001]， [0110100101011100]，[0011101010010110]，[1001011000101011]，[1100010101101001]， [0110100110001011]，[0101010110100110]，[1001011001100011]，[1100011001101001]， [0110100110010101]，[0101100110001110]，[1001011001101010]，[0010111001101001]， [0110100110011100]，[0101101000101110]，[1001011001110100]，[1101000110010110]。 The method of claim 102, wherein the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: [0111010001011010]，[1000110101100101]，[1000111001100101]，[0101101000101110]， [1001011001101010]，[1000111010100101]，[1001011001100011]，[1001101001010101]， [0011001110100101]，[1001011000101011]，[1010010101110001]，[1010010111001100]， [0101011001101001]，[1010101001011001]，[1010011010110001]，[1100010101101001]， [0110100110001011]，[1100011001101001]，[1101010001101001]，[1101000110010110]。 The method of claim 102, wherein the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: [0110010010101110]，[1001101001110100]，[0101011011001100]，[0101100011001011]， [1001101101010001]，[1001101010010011]，[0101011100100110]，[0101101000111001]， [0100111010011010]，[1001101011010001]，[0101011100110100]，[0110010110101100]， [0101100111010001]，[1001110100010110]，[0101100110001011]，[0110011101010010]， [0101110001101001]，[1001110100110100]，[0101100110100011]，[0110101000110011]， [0101110100110001]，[1001110101001001]，[0101101000110011]，[0111010011001010]， [0110001110100101]，[1010001100101101]，[0101101101000110]，[1000101100110101]， [0110010101100011]，[1010001100110101]，[0101110010110010]，[1001010111001100]， [0111001010110010]，[1010001101001101]，[0101110011001010]，[1001100010101101]， [0111010001101001]，[1010010010111001]，[0101110011010010]，[1001101001010011]， [0111010100101100]，[1010010111001100]，[0110001010110110]，[1010010111000110]， [1000101011010011]，[1010011001011100]，[0110001011001011]，[1010011100110100]， [1000101110010110]，[1010011001110100]，[0110001011101001]，[1010110011010001]， [1000110101001101]，[1010100011001011]，[0110010100101110]，[1100100110010101]， [1001101010011100]，[1010100011011001]，[0110010101101100]，[1100101011001001]， [1001110001011010]，[1010100100110011]，[0110010110001011]，[1101010011010001]， [1010001011001110]，[1010100100111001]，[0110010110100011]，[0010110101100110]， [1010001110010110]，[1010100110001011]，[0110011010101100]，[0011001101101010]， [1010011000101110]，[1010100110001101]，[0110011010110100]，[0011101010010110]， [1011000101100101]，[1010100110010011]，[0110011011010100]，[0101001011100110]， [0010101100110110]，[1010100110100011]，[0110100101011100]，[0101100101110010]， [0010101101100110]，[1010100110110001]，[0110100110001011]，[0101101000111010]， [0010101110010110]，[1010110011000101]，[0110100111010100]，[0101110001011010]， [0010110010111001]，[1011000110010101]，[0110101001101100]，[0110001011011010]， [0010110011100101]，[1011001010110001]，[0110110010101100]，[0110001101101010]， [0010110011101010]，[1011001011000101]，[0110110011010100]，[0110010011101010]， [0010111001011001]，[1011010011000101]，[0110110101000110]，[0110010101001110]， [0010111001100101]，[1011010100011001]，[0111001001101010]，[0110011101001010]， [0010111001101001]，[1100010110010101]，[0111001010100110]，[0110100010111001]， [0010111001101010]，[1100010110011010]，[0111001101000101]，[0110100111000101]， [0011001110100101]，[1100010110100110]，[0111010001100101]，[0110100111010001]， [0011001110101001]，[1100011010100110]，[0111010010100110]，[0110101011001100]， [0011010010101110]，[1100100101011001]，[0111010011010100]，[1001010100110011]， [0011010101100110]，[1100100110101001]，[0111010100100110]，[1001011000101110]， [0011011001010110]，[1100101010011001]，[1000101011011001]，[1001011000111010]， [0011011010100110]，[1100101101010001]，[1000101100101011]，[1001011101000110]， [0011100101011001]，[1100110001010110]，[1000101101011001]，[1001100010110101]， [0011101001011001]，[1100110001011010]，[1000101110011010]，[1001101010110001]， [0011101001100101]，[1101000110010101]，[1000110010111010]，[1001101100010101]， [0011101001101010]，[1101000110010110]，[1000110101011001]，[1001110010010101]， [0100101011100110]，[1101000110011010]，[1000110110010101]，[1001110100100101]， [0100101100111010]，[1101000110100110]，[1001001010111001]，[1010001110100101]， [0100110100111010]，[1101001100010101]，[1001001100101011]，[1010010111000101]， [0100110101001110]，[1101001100011010]，[1001001101010011]，[1010011010001101]， [0100111001101010]，[1101001101000110]，[1001010110010011]，[1010110100011001]， [0101001100111010]，[1101010001101001]，[1001011000101011]，[1100010101101001]， [0101011001001110]，[1101010010011001]，[1001011001110100]，[1100110010010101]， [0101011001011100]，[1101010011001001]，[1001011010100011]，[1101001010011001]， [0101011001101100]，[0010101100101110]，[1001100100101011]，[0011001101010110]， [0101011001110010]，[0011010100110110]，[1001100101001011]，[0011010110100110]， [0101011001110100]，[0011011001101010]，[1001100101010011]，[1100101001011001]， [0101011011000110]，[0101001100101110]，[1001101001011100]，[1100110010101001]。 The method of claim 102, wherein The method of any of claims 1-19, wherein: [1000101110010110]，[1011000101100101]，[0110110101000110]，[0011010101100110]， [1001101101010001]，[1011010100011001]，[0111001101000101]，[0011101001011001]， [0010110101100110]，[1100010110100110]，[0111010001101001]，[0011101010010110]， [0010111001100101]，[1100110001010110]，[0111010010100110]，[0100111010011010]， [0011001101010110]，[1100110001011010]，[0111010100100110]，[0101011100110100]， [0011001110101001]，[1101000110010110]，[0111010100101100]，[0101100101110010]， [0011010010101110]，[1101000110011010]，[1000101011010011]，[0101101000111001]， [0100101011100110]，[1101001100010101]，[1000101011011001]，[0101101101000110]， [0100101100111010]，[1101001101000110]，[1000101101011001]，[0101110011010010]， [0101001011100110]，[1101010010011001]，[1000110101011001]，[0110001010110110]， [0101001100111010]，[0011011001101010]，[1001001010111001]，[0110001011011010]， [0101011011001100]，[0101011001101100]，[1001001100101011]，[0110011010101100]， [0101011100100110]，[0101110001101001]，[1001011000101110]，[0110011010110100]， [0101100110001011]，[0101110100110001]，[1001011101000110]，[0110100111010001]， [0101101000110011]，[0110010011101010]，[1001100100101011]，[0111001010100110]， [0101110011001010]，[0110100111000101]，[1001100101001011]，[1001010100110011]， [0110001011001011]，[1000110010111010]，[1001101001011100]，[1001010111001100]， [0110001011101001]，[1001100101010011]，[1001101011010001]，[1001011000111010]， [0110010010101110]，[1001110001011010]，[1001110100010110]，[1001011001110100]， [0110010100101110]，[1010100100110011]，[1001110101001001]，[1001100010101101]， [0110010101001110]，[1011010011000101]，[1010001100101101]，[1001100010110101]， [0110010110100011]，[1100100110010101]，[1010001100110101]，[1001101010110001]， [0110011011010100]，[1100101010011001]，[1010001110010110]，[1001101100010101]， [0110011101001010]，[1101010011001001]，[1010010010111001]，[1001110100100101]， [0110100101011100]，[0010101101100110]，[1010010111000110]，[1010010111001100]， [0110100110001011]，[0010110011101010]，[1010011001110100]，[1010110100011001]， [0110101000110011]，[0010111001101001]，[1010100011011001]，[1100010101101001]， [0110101011001100]，[0011001101101010]，[1010100110010011]，[1100110010010101]， [0110110011010100]，[0011001110100101]，[1010110011000101]，[1100110010101001]， [1101001010011001]。 the first sequence or a base sequence corresponding to the first sequence has a length of 16; and / or, the first sequence or the first sequence comprises 8 non-overlapping ‘01’ and / or ‘10’; and / or, the first sequence or the first sequence comprises 8 non-overlapping transitions of ‘01’ and / or ‘10’. the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: The method of claim 107, wherein the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: [0101011001101001]，[0101010110100110]，[1001011001101010]，[1001101001010101]， [0110100110010101]，[0110010110101010]，[1010100110010110]，[1010101001011001]。 The method of claim 107, wherein the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: [1001011001101010]，[1001101001010101]，[1010101001011001]，[0101011001101001]。 The method of claim 107, wherein the first sequence or a base sequence corresponding to the first sequence comprises one or more of the following sequences: [0101100110011010]，[0110011001010110]，[1001100101011001]，[1001100101101001]， [0101101001100110]，[0110011001011010]，[1010010110011001]，[1001100110100101]， [0110011010100110]，[0110011010010110]，[1010011001100101]，[1001100110101001]， [0110100110011010]，[0110011010011010]，[0101100101100110]，[1001101001011001]， [0110101001100110]，[0110100101100110]，[0101100110010110]，[1001101010011001]， [1001010110011001]，[1001011010011001]，[0110010101100110]，[1010011001101001]， [1001011001100101]，[1001100101100101]，[0110010110100110]，[1010011010011001]。 The method of claim 107, wherein the first sequence or a base sequence corresponding to the first sequence comprises a sequence suitable for a first type of receiver and a second type of receiver, wherein the first type of receiver and the second type of receiver satisfy one or more of the following: [0101100101100110]，[0110101001100110]，[0110011001011010]，[1001100110100101]， [0101100110010110]，[1001010110011001]，[0110011010010110]，[1001101001011001]， [0101100110011010]，[1001011001100101]，[0110011010011010]，[1010010110011001]， [0101101001100110]，[1001011010011001]，[0110011010100110]，[1010011001100101]， [0110010101100110]，[1001100101011001]，[0110100101100110]，[1010011001101001]， [0110010110100110]，[1001100101100101]，[0110100110011010]，[1010011010011001]。 The method according to any one of claims 1 to 19, characterized in that the first type of receiver has AGC and / or ADC functions; the first type of receiver does not detect the sequence in the synchronization field based on a decoding result of the sequence in the synchronization field; the second type of receiver does not have ACG and / or ADC functions; the second type of receiver detects the sequence in the synchronization field based on a decoding result of the sequence in the synchronization field. the decoding manner of the second type of receiver to the sequence in the synchronization field comprises one of the following: Manchester decoding, decoding based on level transitions of the sequence in the synchronization field. The method of claim 113, wherein The method of any of claims 1-19 and 112-113, wherein: the first sequence or a base sequence corresponding to the first sequence has a length of 24; and / or, ​ The first sequence or the base sequence corresponding to the first sequence comprises 12 non-overlapping '01' and / or '10'; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 12 non-overlapping transitions of '01' and / or '10'. The method of claim 114, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [011001011001010101101010]，[100110011001011010010101]， [100110100110101010010101]，[100110011010010110010101]， [010101010110100101100110]，[100110011010010110101010]， [010101011001100110100101]，[100110011010011010010101]， [010101011001101001011010]，[100110011010100101011001]， [010101011010010110100110]，[100110100110011001010110]， [010101100101011001101001]，[100110101001010110011001]， [010101100110011010011010]，[100110101001101010100101]， [010101101010011010011001]，[100110101010100101011001]， [010101101010100110100110]，[100110101010100101101001]， [010110010110010101101010]，[101001010101011001100101]， [010110010110011001101010]，[101001010110010110011010]， [010110011010101001011010]，[101001010110011001100101]， [010110100101010101100110]，[101001010110011010011010]， [010110100101010110011010]，[101001011001100101010101]， [010110100101100110101010]，[101001011001100110010101]， [010110100110011001100101]，[101001011001100110101010]， [011001010110101010100110]，[101001100110010110101010]， [011001011001010110101001]，[101001100110101010100101]， [011001011010010110101010]，[101001101001010110011001]， [011001100101011010011010]，[101001101010010101100110]， [011001100101101010101001]，[101010100101101001100110]， [011001100110101010010110]，[101010100110011010010110]， [011001101001011010101010]，[101010101001011001100101]， [011001101010100101101001]，[010101010110011001011010]， [011001101010101001011010]，[010101011001010110011010]， [011010010101010101100110]，[010101011010011001100101]， [011010010101010110011001]，[010101011010100110100110]， [011010010110011010101001]，[010101100110010110100101]， [011010011001010110010101]，[010101100110011001011010]， [100101100110101001101010]，[010101100110011010010110]， [100101101001100101010110]，[010101101001011001100110]， [100101101010101001100110]，[010101101001101001100110]， [100101101010101010011001]，[010101101010011010011010]， [100110010101010110100101]，[010110010110011010100101]， [100110010101011010010110]，[010110011001011010101010]， [100110010110100101010101]，[010110011001100101011010]， [100110011001010101101001]，[010110011001100110100101]， [100110011010010101010110]，[010110011010100110101010]， [100110011010100101100101]，[010110101010011010100110]， [100110100101101001010101]，[011001010110011001101001]， [100110100110101001010110]，[011001011001010110101010]， [100110101001010101011001]，[011001011010101001100110]， [101001011001100110011010]，[011001100101010101101001]， [101001011010011001010101]，[011001100101010110100110]， [101001011010101001100101]，[011001101001010101010110]， [101001011010101010011001]，[011001101010011010101001]， [101001100101010110100101]，[011001101010101010010110]， [101001101001100110010101]，[011010010101011001100110]， [101001101001101010010101]，[011010010110101010011001]， [101010010101011001011001]，[011010011001101010101001]， [101010010101100101100110]，[011010011010101001010110]， [101010011001100101100101]，[011010100101010110010110]， [101010011010100110010110]，[011010100110011001011001]， [101010100101101001011001]，[011010101001010110010110]， [101010100110010110100101]，[011010101001101010011001]， [101010100110011001011010]，[011010101010010110011001]， [101010101001011010011001]，[011010101010011001101001]， [010101010110100110011010]，[011010101010100101100110]， [010101011001100101101001]，[100101010101011010011001]， [010101011010010110011001]，[100101010101100110010110]， [010110010101101010011001]，[100101010101101001100110]， [010110010110101001100110]，[100101010110010101100110]， [010110011001010101011010]，[100101010110101001101001]， [010110011001101001010101]，[100101011001100110100110]， [010110100110011001010101]，[100101011010101001101001]， [010110100110011001101010]，[100101100101010110101001]， [010110100110011010101010]，[100101100110010101010110]， [010110101001100101100101]，[100101101001010101100110]， [010110101001100110011010]，[100101101010100110011001]， [010110101001101001100101]，[100110010101010101101001]， [010110101010100110011010]，[100110010101100101010110]， [011001010101011010010110]，[100110010110101010101001]， [011001010101011010100110]，[100110011010101001011001]， [011001010110010101011010]，[100110011010101010010110]， [011001010110101001100110]，[100110100101010110011001]， [011001011001100110101001]，[100110100110101001010101]， [011001100101011010100110]，[100110101001100110010110]， [011001100101100101101010]，[101001010101100101011001]， [011001100101101001010101]，[101001100101011001010101]， [011001100101101001101010]，[101001100110011001011010]， [011001100110100101101010]，[101001100110011010100101]， [011001101001101010010101]，[101001100110100101010101]， [011001101010010101100101]，[101001101001100101011010]， [011010010110011001010101]，[101010010101100101100101]， [011010010110011001101010]，[101010010110010110011001]， [011010010110101010100110]，[101010010110100110011001]， [011010011001100101011001]，[101010011001100101101001]， [011010011001100110101001]，[101010011001100110100101]， [011010011010100101010110]，[101010011001101001011010]， [011010100101011001011001]，[101010100101011001011001]， [011010100110011001101001]，[101010100101100110011010]， [011010101001100101101001]，[101010100110101001100101]， [100101010110011010010110]，[101010101001100110100101]， [100101011001100110010110]，[010110100101100110010101]， [100101011010100110100110]，[101001011010011001101010]， [100101100101011010101001]，[010101100101101001100110]， [100101100110011001010110]，[010110011010011010100101]， [100101100110011010100110]，[101001100101100101011010]， [100101101001010101011001]，[101010011010010110011001]， [100101101001100110010101]，[010101100101101010011001]， [100101101001100110101010]，[010101101001011001101010]， [100110010101101010011010]，[010101101001101010011001]， [100110010110010101101010]，[010101101010011001101001]。 The method of any of claims 1-19 and 112-113, wherein: The first sequence or the base sequence corresponding to the first sequence has a length of 32; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 16 non-overlapping '01' and / or '10'; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 16 non-overlapping transitions of '01' and / or '10'. The method of claim 116, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [01010101101001101001100110011010]，[01101010010101010101100101100110]， [01101001100101010110101001101010]，[01101010100101011001010110010110]， [10010110011010101001010110010101]，[01101010100110011001101001011001]， [10101010010110010110011001100101]，[01101010101001011010010110011001]， [01010110101001101001101001100110]，[10010101010110100101101001100110]， [01100101011001011001101010100101]，[10010101011001100110010110100110]， [01100101100101101001010110101010]，[10010101011010100110101001101001]， [01100110101010100110010110100101]，[10010101101010101010011010011001]， [10011001010101011001101001011010]，[10010110010101100101011010101001]， [10011010011010010110101001010101]，[10010110010110101010011001100110]， [10011010100110100110010101011010]，[10011001011001010101010110101001]， [10101001010110010110010110011001]，[10011001011010010101100110101010]， [01010101011010010110100110011010]，[10011001100101101001010101011001]， [01010101100110101001011010011001]，[10011001100101101001101010101001]， [01010101101001011010011001100101]，[10011001100110100110100101010110]， [01010101101010010110100110100110]，[10011001101001101001101010010101]， [01010110101001100110010110010110]，[10011001101010011010011010010101]， [01010110101001101010011010011001]，[10011010010110011001100101010110]， [01011001100101010101101001011010]，[10011010100101010101100110010110]， [01011001100101010110100110101001]，[10100101010101100101100110011010]， [01011001100110100110101010100101]，[10100101010101101001011001100101]， [01011010010101010101100110011010]，[10100101011001010110010110011010]， [01100101100101011001010110101010]，[10100101011001100110011010011010]， [01100101101010100110011001101001]，[10100101101001100101010101100110]， [01100110100110101001101010010101]，[10100110011001011010010101010110]， [01101001011001100110011010101001]，[10100110011010010110101010100101]， [01101001100110100101101010101001]，[10100110100110011001010110101010]， [01101001100110101001010101010110]，[10101001010110011001100101100101]， [01101001101010100101100110011001]，[10101001011001011001100110011010]， [01101010100110011001100101101001]，[10101001101001010101011001100101]， [01101010101001011010011001100101]，[10101010011001100101101001100101]， [01101010101010010101100110010110]，[01010101011010100101101001100110]， [10010101010101101010011001101001]，[01010101101001011001100110011010]， [10010101010110100101100110011010]，[01010110011001100110100110100101]， [10010101011001100110011010010110]，[01011001011001100110010101101010]， [10010110010101011010011001100110]，[01011001100101010101101001101010]， [10010110011001010110101010101001]，[01011001100101101001011010101010]， [10010110011001011010010101010110]，[01011001100110010101011010011010]， [10010110100110011001100101010110]，[01011001100110010110010110101010]， [10011001011001010110010101101010]，[01011001100110011010101001011010]， [10011010010101011001100110010110]，[01011001100110100101101001010101]， [10011010011010100110101001010101]，[01011010011010100101100110010101]， [10100101101010101010011001100101]，[01100110011001010101101001101001]， [10100110011001011001010101011010]，[01100110011010101010010110100110]， [10100110011010101001011001010110]，[01101001011001100110101010101001]， [10100110011010101010010110100101]，[01101001101001100110010101101010]， [10101001010110010101100101100110]，[01101010011010010101011001100101]， [10101001010110011001101001101001]，[01101010100110100101100110011001]， [10101010010101101001011001011001]，[01101010101010011001100101101001]， [10101010010110100101100110011010]，[10010101010101100110011010010110]， [10101010011001010110100101100110]，[10010101011001011010011001100110]， [10101010100101101001011001100101]，[10010101100101101010100110011010]， [01010101101010011001100101100101]，[10010110010110011001101010010101]， [01010101101010011010100110100110]，[10010110100110011001010101010110]， [01010110010101101010100110010110]，[10011001100101010101101001011001]， [01010110100110100110101001100110]，[10011001100110101010010110010110]， [01011001011001100110011010100101]，[10100101100101011010011001101010]， [01011001100110101010101001011010]，[10100110011001011010010110101010]， [01011001101001101010011010100101]，[10100110011001100101010110100101]， [01011010010110101010100110011010]，[10100110011001101001101001010101]， [01011010101001100101100101011001]，[10100110011001101010100101100101]， [01100101010101101001011001100110]，[10100110011010010110100101010101]， [01100101011001011010101001100110]，[10100110011010101010010110010101]， [01100101100101010110101001100110]，[10100110100110011001101010010101]， [01100101101001010101011001100110]，[10101001100110011001011001011010]， [01100110010101101010100110100110]，[10101010010110100110011001100101]， [01100110010110100101011010101010]，[10101010100101011010010110011001]， [01100110010110100101101010101001]，[01010101100101101001100110011010]， [01101001011010011001101010101001]，[01010101100110011001011010011010]， [01101010100101100101100110011001]，[01010110011001011010100110100101]， [01101010101001011010011001101001]，[01011001010110101010100110011010]， [01101010101001100110100101101001]，[01011001100101010101101010011010]， [01101010101010010110100101100110]，[01011001100110010110100110101010]， [10010101010101101001011010011001]，[01011001101001011001100110101010]， [10010101010110011001011010010110]，[01011010011010011001100110010101]， [10010101010110100101100110010110]，[01100101100110010101100110101001]， [10010101011010011010011001100110]，[01100110010101011010011010100110]， [10010110100101100110010101010110]，[01100110011001011010101001101001]， [10011001101001011010010101010110]，[01100110100101101001010101010110]， [10011001101001011010100101010101]，[01101001100110101010100101011001]， [10011001101010010101011001011001]，[01101010011001010110011001011001]， [10011010010110101010100110011001]，[10010101100110101001100110100110]， [10011010011010101001010110011001]，[10010110011001010101011010100110]， [10011010100110100101010110011001]，[10011001011010010110101010101001]， [10011010101010010110100110011001]，[10011001100110100101010110010110]， [10100101010110011010011010100110]，[10011001101010100101100101011001]， [10100101101001010101011001100101]，[10011010011001101010011001010110]， [10100110010110010101100101011010]，[10100101100101100110011001101010]， [10100110011001010101010110100101]，[10100110010110100110011001010101]， [10100110100110011001100101011010]，[10100110011001101001011001010101]， [10101001011001011001010110011001]，[10100110011010101010010101100101]， [10101001101010010101011001101001]，[10100110101001010101011001100101]， [10101010010101100101011001011001]，[10101001100110100101011001011010]， [10101010010101100110011010011010]，[10101010011001100110100101100101]， [01010101100110011010010110011010]，[10101010011010010110011001100101]， [01010110010110101010100110011010]，[01011001011010011001100110101010]， [01010110100110100110011001100101]，[01011001011010101001100110011010]， [01010110101001100110011010011010]，[01011001100110011010011010010101]， [01011001011001100110101001010101]，[01100110011001011010011010101001]， [01011001100101101001010101011010]，[01101001100110011010101001011001]， [01011001100110100101101010101001]，[01101010101001101001011001100110]， [01011010010110011010101010011001]，[10010101010110010110100110011001]， [01011010100110011001100101100101]，[10010110011001100101010110100110]， [01011010100110101001101001100101]，[10011001100110100101100101010110]， [01011010101010010110100110011010]，[10100110011001100101100101101010]， [01011010101010011010011001100101]，[10100110100101010110011001100101]， [01100101011010101010011001101001]，[10100110100101100110011001010101]， [01100101101001100110011010101001]，[01011001100110011010010110101010]， [01100110010101100101100101101010]，[01011010010101011001100110011010]， [01100110010110010110010101101010]，[10100101101010100110011001100101]， [01100110011001011001011010101001]，[10100110011001100101101001010101]， [01100110011010010110010101010110]，[01011010100110011001011001011001]， [01100110011010010110101010100110]，[10100101011001100110100110100110]， [01100110100101101010011001010101]，[01011010101010011001100101100101]， [01100110100110101010101001010110]，[01100110010110010101101010101001]， [01101001101001010101100110011001]，[10011001101001101010010101010110]， [01101001101010011010100101010110]，[10100101010101100110011010011010]。 A communication method characterized by comprising: The method comprises: The second device receives a first physical layer protocol data unit (PPDU) transmitted by the first device. The first PPDU comprises a synchronization field, and a sequence in the synchronization field comprises a first sequence. The method of claim 118, wherein The first sequence comprises a first number of 0s and a second number of 1s, and the first number and the second number are equal. The method of claim 118 or 119, wherein A duration occupied by a modulation symbol corresponding to a continuous 0 or a continuous 1 in the first sequence is less than or equal to a first duration. The method of claim 120, wherein The first duration is less than or equal to 9 microseconds. The method of claim 121, wherein The first duration is 8 microseconds. The method of any one of claims 118 to 122, wherein A first bit of the first sequence is 1. The method of any one of claims 118 to 123, wherein The first sequence is one of a plurality of candidate sequences of the synchronization field, each candidate sequence of the plurality of candidate sequences corresponds to one or more transmission parameters, wherein different candidate sequences correspond to different transmission parameters. The method of claim 124, wherein The transmission parameters comprise one or more of the following: a data rate, a symbol length, a transmission mode, a waveform, a coding mode. The method of any one of claims 118 to 125, wherein The first sequence is one of one or more candidate sequences of the synchronization field, the one or more candidate sequences are associated with a base sequence set, the base sequence set comprises M base sequences, M is an integer greater than or equal to 1. The method of claim 126, wherein The one or more candidate sequences being associated with the base sequence set comprises: The one or more candidate sequences are candidate sequences corresponding to the M base sequences, wherein each base sequence corresponds to N candidate sequences, N is an integer greater than or equal to 1. The method of claim 127, wherein Each base sequence corresponding to N candidate sequences comprises: Each base sequence corresponds to N candidate sequences in N ways, respectively. The method of claim 128, wherein The N ways comprise one or more of the following: A candidate sequence is a corresponding base sequence; A candidate sequence is a complement sequence of a corresponding base sequence; A candidate sequence is a sequence formed by repeating connection of a corresponding base sequence; A candidate sequence is a sequence formed by repeating connection of a complement sequence of a corresponding base sequence; A candidate sequence is a sequence formed by connection of a corresponding base sequence and a complement sequence of the corresponding base sequence. The method of any one of claims 127 to 129, wherein The one or more candidate sequences include one or more of the following: wherein [G] represents the set of said base sequences, A complement sequence set of the base sequence set is represented. The method of any one of claims 127 to 130, wherein A sum of related parameter values of the N candidate sequences corresponding to each base sequence is greater than or equal to a first value. The method of claim 131, wherein The correlation parameter value of each candidate sequence is associated with a sliding correlation result of the candidate sequence and a second sequence corresponding to the candidate sequence, wherein the second sequence corresponding to the candidate sequence is associated with a base sequence corresponding to the candidate sequence. The method of claim 132, wherein The correlation parameter value of each candidate sequence includes a ratio of a maximum value and a second maximum value in absolute values of the sliding correlation result of the candidate sequence and the second sequence corresponding to the candidate sequence. The method of claim 132 or 133, wherein The second sequence corresponding to the candidate sequence is associated with the base sequence corresponding to the candidate sequence, including: Ref = 2 x G m -1, wherein Ref denotes the second sequence corresponding to the candidate sequence, G m denotes the mth sequence in the base sequence set [G], 1≤m≤M, and G m is the base sequence corresponding to the candidate sequence. The method of any one of claims 118 to 134, wherein The cross-correlation between the first sequence and a third sequence is less than or equal to a second value, and the third sequence is carried in a synchronization field of a narrow band part of a second PPDU, wherein the first PPDU is used for an access point (AP) to communicate with a first type of device, and the second PPDU is used for the AP to communicate with a second type of device. The method of claim 135, wherein The first type of device is an ambient energy (AMP) device, and the second type of device is a wake-up radio (WUR) based device. The method of any one of claims 118 to 136, wherein The length of the first sequence or the base sequence corresponding to the first sequence is even. The method of any one of claims 118 to 137, wherein The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. The method of any one of claims 118 to 137, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 8. The method of any one of claims 118 to 137, wherein The first sequence or the base sequence corresponding to the first sequence includes multiple '01's and / or '10's; or, the first sequence or the base sequence corresponding to the first sequence includes multiple transitions of '01's and / or '10's. The method of claim 139, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [01001110]； [10110001]； [11000101]； [10001101]； [01110010]； [10100011]。 The method of any one of claims 118 to 137, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 10. The method of claim 142, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0110111000], [0111001001], [1000101101], [1000110110], [1001000111], [1010010011], [1011000101], [1011010001], [1100100101], [1101000110], [1110001001]. The method of any one of claims 118 to 137, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 12. The method of claim 144, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [011100010110], [011010001110]. The method of any one of claims 118 to 137, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 14. The method of claim 146, wherein [00011011101001], [00011101100101], [00101011100110], [00111010100110], [01000111001101], [01001011001110], [01001101011100], [01001101110010], [01010011100110], [01011001000111], [01011001001110], [01011001110010], [01011100010110], [01100011101001], [01101001000111], [01110001001011], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [11010001000111], [11010001010011], [11010010001110], [11010010100011], [11010100110001], [11100010011010], [11100010100101], [00101110110001], [01001011101100], [01001110011010], [01011011100010], [01100101001110], [01100111001010], [01100111010010], [01100111010100], [01101001100101], [01101001110001], [01101100110010], [01101100110100], [01110001001010], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [11010001000111], [11010001010011], [11010010001110], [11010010100011], [11010100110001], [11100010011010], [11100010100101], [00101110110001], [01001011101100], [01001110011010], [01011011100010], [01100101001110], [01100111001010], [01100111010010], [01100111010100], [01101001100101], [01101001110001], [01101100110010], [01101100110100], [01110001001010], [01110001001101], [01110010001011], [10001010110011], [10001011011100], [10001101100101], [10001110110100], [10010010111001], [10010111011000], [10011010100011], [10011010110001], [10100100011101], [10100110110001], [10110001001011], [10110010001110], [10110010100011], [10110100100011], [10111000100101], [11000100110101], [11000101010011], [11000101011001], [11000110010101], [11001001000111], [11001010001011], [11001010001110], [11001010100011], [11001101010001], [11010001000111], [11010001010011], [110[01110001001110]，[01110001011001]，[01110001011010]，[10010101100011]，[10011100100101]，[10100011100110]，[10100110001110]，[10100110100011]，[10101001100011]，[11000101100101]，[11000110101001]，[11100010100110]，[00100111010110]，[00101101110001]，[00101110101100]，[00110100101110]，[00110101110100]，[00110111010010]，[00110111010100]，[00111000101101]，[00111010011010]，[01000111010110]，[01000111011010]，[01001100011101]，[01001101001110]，[01011000110110]，[01011001011100]，[01011100010011]，[01011100110010]，[01100011100101]，[01100101011100]，[01100101110001]，[01100111010100]，[01101000111010]，[01101001001110]，[01101010001110]，[01101011100010]，[01101011100100]，[01101100011010]，[01101101000110]，[01110001010011]，[01110001010110]，[01110001100101]，[01110001101001]，[01110010001110]，[01110010010110]，[01110010011010]，[01110010101100]，[01110010110010]，[01110100101100]，[10001100101011]，[10001100101101]，[10001100110101]，[10001101001101]，[10001101010011]，[10001101110100]，[10001110100110]，[10001110110010]，[10010100010111]，[10010111000110]，[10011000101101]，[10011010001110]，[10100011100101]，[10100100111001]，[10100110001101]，[10101001000111]，[10101100110001]，[10110001000111]，[10110001001101]，[10110001110010]，[10110100011100]，[10110100110001]，[11000100101101]，[11000110001011]，[11001001010011]，[11001010110001]，[11010001001110]，[11010001100011]，[11010010001101]，[11100010001011]，[11100010001101]，[11100010010011]，[11100010010101]，[11101000101001]，[01001100111010]，[01001110110010]，[01001011100110]。， The method of any one of claims 118 to 137, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 16. The method of claim 148, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [1100011010001011]；[1100100101011100]；[1110001001010011]；[0011010110111000]；[0001110101101100]；[0001110110101100]；[0010111010011100]；[0011001001010111]；[0011010110100011]；[0011011010111000]；[0011101001010011]；[0011101010010011]；[1100010101101100]；[1100010110101100]；[1100100101000111]；[1100101001000111]；[1100110110101000]；[0001010110110011]；[1110001010010011]；[0011100101110100]；[1101000101100011]；[0011011010100011]。 The method of claim 148, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001001101010011]，[1001010001110110]，[1001010110010011]，[1001011001000111]，[1001100010010111]，[1001100101001011]，[1001101001000111]，[1001101010010011]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101010010011]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110]，[1101010001101001]，[1101010010011001]，[1101010011011000]，[1101100011010001]，[1101100100011010]，[1110001000110110]，[1110001001010011]，[1110001001101001]，[1110001001101010]，[1110001010001101]，[1110001010011001]，[1110001011000110]，[1110001100100101]，[1110010001010011]，[1110010001100101]，[1110010001101001]，[1110010001110100]，[1110010010101100]，[1110100100011001]。 The method of claim 150, wherein The first sequence or the base sequence corresponding to the first sequence includes P consecutive 0s or P consecutive 1s, P being a positive integer greater than or equal to 3. The method of claim 151, wherein The first sequence or the base sequence corresponding to the first sequence includes one or more of the following sequences: [0001101100101011]，[0001101110101100]，[0001110111010010]，[0010011101011100]，[0010101100100111]，[0010111010011100]，[0011010110111000]，[0011100100101011]，[0011101000101101]，[0011101001000111]，[0011101010010011]，[0100101110111000]，[0101001001100111]，[0101001101100011]，[0101011001000111]，[0101100110001011]，[0101100111010001]，[0101101000100111]，[0101101000110011]，[0101101100100011]，[0101110001001101]，[0110001110100101]，[0110010001101011]，[0110010101100011]，[0110010110001011]，[0110100110001011]，[0110110001010011]，[0110111000101001]，[0111000100101110]，[0111001000101101]，[0111001010010011]，[0111010010001101]，[0111010010001110]，[1000101011010011]，[1000101011011001]，[1000101100011011]，[1000101101011001]，[1000101110010110]，[1000110101001101]，[1000110101011001]，[1000110101110100]，[1000111010010011]，[1001001010100111]，[1001010001110110]，[1001011001000111]，[1001100010010111]，[1001101001000111]，[1001101011010001]，[1001101101010001]，[1001110001001011]，[1001110010001011]，[1001110101001001]，[1010001001110011]，[1010001011000111]，[1010001011001110]，[1010001110010011]，[1010001110010110]，[1010010011000111]，[1010011001000111]，[1010100011001011]，[1010100110001011]，[1010100110100011]，[1010100110110001]，[1010110001001101]，[1011000101100101]，[1011000110001011]，[1011001000111010]，[1011001010001101]，[1011001010110001]，[1011001011000101]，[1011010001000111]，[1011010001001110]，[1011010001011100]，[1100010011010011]，[1100010011011010]，[1100010101001101]，[1100010101101100]，[1100010110001101]，[1100010110010101]，[1100011001001011]，[1100011010010011]，[1100011010100110]，[1100100011010011]，[1100100100111010]，[1100100101011100]，[1100101001000111]，[1100101001001110]，[1100101001011100]，[1100101100010011]，[1100110001001011]，[1100110001011010]，[1101000110010110]，[1101000110011010]，[1101000110101100]，[1101001000111001]，[1101001001100011]，[1101001010100011]，[1101001100010101]，[1101001101000110]，[1101010001101001]，[1101010011011000]，[1101100011010001]，[1101100100011010]，[1110001000110110]，[1110001001010011]，[1110001001101001]，[1110001001101010]，[1110001010001101]，[1110001010011001]，[1110001011000110]，[1110001100100101]，[1110010001010011]，[1110010001100101]，[1110010001101001]，[1110010001110100]，[1110010010101100]，[1110100100011001]。 The method of claim 148 or 149, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1101000101100011]，[1100100101011100]，[1100011010001011]，[1100010110101100]，[1100010101101100]，[0011101010010011]，[0011101001010011]，[0011100101110100]，[0011011010100011]，[0011010110100011]，[0010111010011100]。 The method of claim 148, wherein The first sequence or the base sequence corresponding to the first sequence comprises 7 or more '01' and / or '10' that are not overlapped; or, the first sequence or the base sequence corresponding to the first sequence comprises a jump of 7 or more '01' and / or '10' that are not overlapped. The method of claim 148 or 154, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [0110010010101110]，[1001101101010001]，[0100111010011010]，[0101100111010001]，[0101110001101001]，[0101110100110001]，[0110001110100101]，[0110010101100011]，[0111001010110010]，[0111010001101001]，[0111010100101100]，[1000101011010011]，[1000101110010110]，[1000110101001101]，[1001101010011100]，[1001110001011010]，[1010001011001110]，[1010001110010110]，[1010011000101110]，[1011000101100101]，[0010101100110110]，[0010101101100110]，[0010101110010110]，[0010110010111001]，[0010110011100101]，[0010110011101010]，[0010111001011001]，[0010111001100101]，[0010111001101001]，[0010111001101010]，[0011001110100101]，[0011001110101001]，[0011010010101110]，[0011010101100110]，[0011011001010110]，[0011011010100110]，[0011100101011001]，[0011101001011001]，[0011101001100101]，[0011101001101010]，[0100101011100110]，[0100101100111010]，[0100110100111010]，[0100110101001110]，[0100111001101010]，[0101001100111010]，[0101011001001110]，[0101011001011100]，[0101011001101100]，[0101011001110010]，[0101011001110100]，[0101011011000110]，[0101011011001100]，[0101011100100110]，[0101011100110100]，[0101100110001011]，[0101100110100011]，[0101101000110011]，[0101101101000110]，[0101110010110010]，[0101110011001010]，[0101110011010010]，[0110001010110110]，[0110001011001011]，[0110001011101001]，[0110010100101110]，[0110010101101100]，[0110010110001011]，[0110010110100011]，[0110011010101100]，[0110011010110100]，[0110011011010100]，[0110100101011100]，[0110100110001011]，[0110100111010100]，[0110101001101100]，[0110110010101100]，[0110110011010100]，[0110110101000110]，[0111001001101010]，[0111001010100110]，[0111001101000101]，[0111010001100101]，[0111010010100110]，[0111010011010100]，[0111010100100110]，[1000101011011001]，[1000101100101011]，[1000101101011001]，[1000101110011010]，[1000110010111010]，[1000110101011001]，[1000110110010101]，[1001001010111001]，[1001001100101011]，[1001001101010011]，[1001010110010011]，[1001011000101011]，[1001011001110100]，[1001011010100011]，[1001100100101011]，[1001100101001011]，[1001100101010011]，[1001101001011100]，[1001101001110100]，[1001101010010011]，[1001101011010001]，[1001110100010110]，[1001110100110100]，[1001110101001001]，[1010001100101101]，[1010001100110101]，[1010001101001101]，[1010010010111001]，[1010010111001100]，[1010011001011100]，[1010011001110100]，[1010100011001011]，[1010100011011001]，[1010100100110011]，[1010100100111001]，[1010100110001011]，[1010100110001101]，[1010100110010011]，[1010100110100011]，[1010100110110001]，[1010110011000101]，[1011000110010101]，[1011001010110001]，[1011001011000101]，[1011010011000101]，[1011010100011001]，[1100010110010101]，[1100010110011010]，[1100010110100110]，[1100011010100110]，[1100100101011001]，[1100100110101001]，[1100101010011001]，[1100101101010001]，[1100110001010110]，[1100110001011010]，[1101000110010101]，[1101000110010110]，[1101000110011010]，[1101000110100110]，[1101001100010101]，[1101001100011010]，[1101001101000110]，[1101010001101001]，[1101010010011001]，[1101010011001001]，[0010101100101110]，[0011010100110110]，[0011011001101010]，[0101001100101110]，[0101100011001011]，[0101101000111001]，[0110010110101100]，[0110011101010010]，[0110101000110011]，[0111010011001010]，[1000101100110101]，[1001010111001100]，[1001100010101101]，[1001101001010011]，[1010010111000110]，[1010011100110100]，[1010110011010001]，[1100100110010101]，[1100101011001001]，[1101010011010001]，[0010110101100110]，[0011001101101010]，[0011101010010110]，[0101001011100110]，[0101100101110010]，[0101101000111010]，[0101110001011010]，[0110001011011010]，[0110001101101010]，[0110010011101010]，[0110010101001110]，[0110011101001010]，[0110100010111001]，[0110100111000101]，[0110100111010001]，[0110101011001100]，[1001010100110011]，[1001011000101110]，[1001011000111010]，[1001011101000110]，[1001100010110101]，[1001101010110001]，[1001101100010101]，[1001110010010101]，[1001110100100101]，[1010001110100101]，[1010010111000101]，[1010011010001101]，[1010110100011001]，[1100010101101001]，[1100110010010101]，[1101001010011001]，[0011001101010110]，[0011010110100110]，[1100101001011001]，[1100110010101001]。 The method of claim 155, wherein In the first PPDU, a signal corresponding to a signal of 1 before the first sequence. The method of any one of claims 118 to 141, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 18. The method of claim 157, wherein The first sequence or the first sequence corresponding to the base sequence includes one or more of the following sequences: [011001010110111000], [100110101001000111], [111000100101011001], [000111011010100110], [101001011100010011], [000101110110101100], [000110110111010100], [000111001101101010], [000111010110110010], [000111011011001010], [000111011100101100], [001101001110111000], [001101011000101110], [001101011011101000], [001110010010111010], [010010010111001110], [010010011100111010], [010011011100011010], [010100110110111000], [010101101100111000], [010110110001000111], [010110110010001110], [010111010010011100], [011001011010001110], [011001110001011010], [011011000101011100], [011011010001001110], [011100010011011010], [011100010011101001], [011100010101101100], [011100010110100110], [011100011010001011], [011100011100100101], [011100101000101110], [011100111010010010], [011101000110101100], [011101001001011100], [100010111001010011], [100011100100110101], [100100101011100011], [100101110100110001], [100110001110100101], [100111001010001011], [100111010001001011], [101000111001100101], [101001001101110001], [101001011011100011], [101001100101011100], [101001110010011100], [101001110100101011], [101001110110010011], [101001110110101100], [101001110111010100], [101001110111011010], [101001110111100101], [101001110111101100], [101001110111110011], [101001110111110100], [101001110111111001], [101001110111111010], [101001110111111011], [101001110111111100], [101001110111111101], [101001110111111110], [101001110111111111], [101001110111111112], [101001110111111113], [101001110111111114], [101001110111111115], [101001110111111116], [101001110111111117], [101001110111111118], [101001110111111119], [101001110111111120], [101001110111111121], [101001110111111122], [101001110111111123], [101001110111111124], [101001110111111125], [101001110111111126], [101001110111111127], [101001110111111128], [101001110111111129], [101001110111111130], [101001110111111131], [101001110111111132], [101001110111111133], [101001110111111134], [101001110111111135], [101001110111111136], [101001110111111137], [101001110111111138], [101001110111111139], [101001110111111140], [101001110111111141], [101001110111111142], [101001110111111143], [101001110111111144], [101001110111111145], [101001110111111146], [101001110111111147], [101001110111111148], [101001110111111149], [101001110111111150], [101001110111111151], [101001110111111152], [101001110111111153], [101001110111111154], [[101001001110100011]，[101001011001000111]，[101001011100011001]，[101001110001001101]，[101010001101100011]，[101010010011100011]，[101100100011100101]，[110001010110100011]，[110001011010100011]，[110001100100101011]，[110001101000101101]，[110001101010010011]，[110001101100010101]，[110001101101000101]，[110001110010010101]，[110010001011010011]，[110010001110100101]，[110010010101110001]，[110010110001000111]，[110100011010010011]，[110100101000100111]，[110101000101100011]，[110101001001100011]，[110101001001110001]，[111000100010110101]，[111000100010110110]，[111000100011011010]，[111000100101001101]，[111000100110100101]，[111000101001001101]，[111000101010010011]，[111000101100101001]，[111000110010010101]，[111001000101001011]，[111010001001010011]，[111010010010001110]，[001101011010001110]，[001101101010001110]，[001110001010110110]，[001110101000110110]，[010001110011011010]，[010100110110001110]，[011000110100101110]，[011000110101110100]，[011001101011100010]，[011010001101110001]，[011011000111001010]，[011011010001000111]，[011011010100011100]，[011100010010010111]，[011100011011000101]，[011100100010110110]，[011101000101001110]，[011101001010001110]，[100010110110001101]，[100011100100101011]，[100011101010010011]，[100011101100010110]，[100011101100100101]，[100100111000110101]，[100100111010100011]，[100101001110001011]，[100111011001010001]，[101000101101100011]，[101000110001101101]，[101001011100110001]，[101011000111001001]，[101011001001000111]，[101101100011000101]，[101101101000110001]，[101110001100100101]，[110001010010110011]，[110001010111001001]，[110001101000101011]，[110001101010001011]，[110001110101001001]，[110010100100010111]，[110010100110001011]，[110011010010100011]，[110100010010100111]，[110100010011100011]，[110100010100111001]，[110100010101100011]，[110100110001000111]，[110101000111001001]，[110110010010100011]，[111000100010101101]，[111000100011010011]，[111000100100110101]，[111000101001011001]，[111000110010001011]，[111001010010001011]，[000110110101110100]，[000110111010110100]，[001010110110011100]，[001010111000110110]，[001010111011011000]，[001011010111011000]，[001011101011000110]，[001011101011011000]，[001110011011010100]，[001110100011010110]，[001110100100101110]，[010001110101100110]，[010011011010111000]，[010100111000110110]，[010110001110110010]，[010110011010001110]，[010110110011100010]，[011000111010001101]，[011001010110001110]，[011001110001010110]，[011010001011001110]，[011010001110001011]，[011010001110110001]，[011010100011100110]，[011010110001011100]，[011010111000100110]，[011011000111010100]，[011011100011000101]，[011100010100101110]，[011100010110101100]，[011100011011001010]，[011100100100101110]，[011101000110001101]，[011101001001001110]，[011101001011000110]，[100010100110111001]，[100010100111011001]，[100011000101101101]，[100011001011101001]，[100011001110100101]，[100011011100010110]，[100011100101001101]，[100011101001100101]，[100100101011000111]，[100100111000101011]，[100101001100010111]，[100101001101000111]，[100101001110100011]，[100101110010001110]，[100110111000101001]，[100110111001010001]，[101000110001110110]，[101000110011100101]，[101000110100100111]，[101000110110001110]，[101001001110001110]，[101001100101110001]，[101001100111000101]，[101001101001000111]，[101001110001100101]，[101001110011000101]，[101010001110010011]，[101010010011000111]，[101011010001000111]，[101100010111000110]，[101100011000101110]，[101100011010001011]，[101100011011010001]，[101100011100010110]，[101100100101000111]，[101100101001000111]，[101100101001110001]，[101101000100011011]，[101101000100011101]，[101101000100111001]，[101101000101100011]，[101101010001000111]，[101110001001001011]，[110001000111010011]，[110001001011001011]，[110001001101001011]，[110001010110001101]，[110001011100100101]，[110001011100101001]，[110001110010001011]，[110010001110001011]，[110010010101100011]，[110010010110001011]，[110010011100010101]，[110010100010111001]，[110010100110100011]，[110010100111010001]，[110010101001000111]，[110010110100010011]，[110100010011000111]，[110100010100100111]，[110100010110001101]，[110100011001010011]，[110100011100010011]，[110100100010111001]，[110100100011100011]，[110100100100011101]，[110100101100100011]，[110100110100100011]，[110101000100100111]，[111000100011001011]，[111000100101010011]，[111000100101100101]，[111001001000101011]，[111001001010001011]，[111001001011000101]，[111010001100101001]，[011100010110011010]，[100111010001010011]，[101001001110001101]，[101001100011100101]，[101011001001110001]，[101100011100100101]，[101110001000101101]，[110001010010011011]，[110001110001001011]，[110010001101001011]，[110010111000100011]，[110100010110001110]，[110100011100010110]，[110100011100101001]，[110100101100010011]，[110110001000101101]，[011100011010100110]，[011100110100010110]，[110001011001010011]。， The method of any one of claims 118-140, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 20. The method of claim 159, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [00101101011100010011], [01101011010001000111], [11000111010001001011], [00110111000101001011], [11001000111010110100], [11001011010001000111], [00011011011000101011], [00011101110100101001], [00011101110100101100], [00101011100100100111], [00101101110001011100], [00101101110100011100], [00110100101110111000], [00111010001110110100], [10010100101110111000], [11000101110001001011], [11010010001011100011], [11010010001110100011], [11010010100011101100], [11010100011011011000], [11100010001011010011], [11100010001011010110], [11100100100111010100]. The method of any one of claims 118-140, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 22. The method of claim 161, wherein The first sequence or the first sequence corresponding to the base sequence includes one or more of the following sequences: [0011010010101110111000], [0011101101001000101110], [0011101110100011010010], [0100101100010111011100], [0100101110100011001110], [0101001001101110001110], [0101100101110010001110], [0110001001110101110100], [0110100111000100010111], [0110110001110001010110], [0111000100010111001011], [0111000100111010011010], [0111000100111010110100], [0111000101001011101100], [0111000111010001001011], [0111000111011001001010], [0111010001100010110110], [1000110111001010001011], [1000110111001101000101], [1000111010010100011011], [1001010111000100100111], [1001011011000101000111], [1001110001011100100101], [1001110110100010100011], [1010110100010011000111], [1010110110010001110001], [1011000100101011100011], [1011010001100111000101], [1011010011101000100011], [1011010100010011000111], [1011100010010110001011], [1100010001011100101101], [1100011001011010001011], [1100011101010010001101], [1100100101010001110011], [1100101100011010100011], [1100101101010001000111], [1100110001011010001011], [1100110011010001010110], [1100110100010111000111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [1100110110010001010111], [110011[1101001000101011100011]，[1101001000111000101110]，[1101010010010011000111]，[1110001000101011010011]，[1110001010001101101001]，[1110001011000101001101]，[1110001011001010001101]，[1110001101010001001101]，[1110001110010010010101]，[1110010010011000101011]，[1110011000101101000101]，[1110100010001110010110]，[0001011101110010110100]，[0001110111010100101100]，[0010110100111011101000]，[0010110101110010001110]，[0010111001011011100010]，[0010111010110001001110]，[0010111010111001000110]，[0011011100010100101110]，[0011100101101000101110]，[0100011101101001110100]，[0100110100011101110010]，[0100111011100010110010]，[0101110001000110110110]，[0110001010111000110110]，[0110001011100011010110]，[0110010010101110001110]，[0110100100010111011100]，[0110100101110010001110]，[0110101110001000110110]，[0110110001110101000110]，[0110110100011000101110]，[0111000100111010010110]，[0111000101100101001110]，[0111000111010100100110]，[0111001000111000101101]，[0111001100010111010010]，[0111010001001011011100]，[0111010001110001001011]，[0111010010010001101110]，[0111011000100100101110]，[1000101110011101001001]，[1000110011101000101101]，[1000111000100110110101]，[1000111010001001011011]，[1000111010010001101011]，[1000111011101000110100]，[1001001011100111010001]，[1001001110011101000101]，[1001110100100101000111]，[1010001001110011100101]，[1010001010011100100111]，[1010001011010001100111]，[1010001101100111000101]，[1010001101110001100101]，[1010001110010100100111]，[1010001110011000101101]，[1010001110011011000101]，[1010011000111011000101]，[1010100100100111000111]，[1010110001110001001101]，[1010110010001011000111]，[1011000100011101001101]，[1011000111001000101110]，[1011001000101011000111]，[1011001000110101000111]，[1011001000111000110101]，[1011001010001101000111]，[1011001010110001000111]，[1011001110001000101101]，[1011010001011100011001]，[1011010001011100110001]，[1011010011000100010111]，[1011010011100010001011]，[1100010011010110100011]，[1100010011101001001011]，[1100010101100011010011]，[1100010110010100011011]，[1100010110011010100011]，[1100011000101011001011]，[1100011001010110001011]，[1100011010001001011011]，[1100011010100010110011]，[1100011011010010001011]，[1100011100100100101011]，[1100011101000100101101]，[1100011101010001001011]，[1100100100011101010011]，[1100100110100101000111]，[1100101010010011100011]，[1101000101001110010011]，[1101000110100100011101]，[1101000110101001100011]，[1101000111000100100111]，[1101001000100111000111]，[1101001000101110001110]，[1101001010001100100111]，[1101001101010001100011]，[1101001110100010001110]，[1101010001100100100111]，[1101010010010011100011]，[1101100010100101110001]，[1101100010100110100011]，[1101101001000101110001]，[1110001000110101001101]，[1110001001100101001011]，[1110001001101000110101]，[1110001010010010111001]，[1110001010010110010011]，[1110001010110001001101]，[1110001100100100101011]，[1110001110010001001011]，[1110010001011001010011]，[1110010010001110001011]，[1110010010001110101001]，[1110010011000101001011]，[1110010011100101000101]，[1110010100110010001011]，[1110100010001100101101]，[0010110001011101110001]，[0011011101001010001110]，[0011101110100010010110]，[0110001011011010001110]，[0110101000111000110110]，[0110101100011101000110]，[0110110001000111010110]，[0110110001010111000110]，[0110110110001000111010]，[0111000101101101000110]，[0111001000110101110100]，[0111010001001110001101]，[0111010001100101001110]，[0111010010100011101100]，[1000101110011100100101]，[1001001110010100010111]，[1001100011101000101101]，[1010001011001110110001]，[1010001011100111001001]，[1010010011100111010001]，[1010011100111001000101]，[1011001000111000101101]，[1011001011100010001101]，[1011010001000111001101]，[1011010001110001001101]，[1011010001110001001110]，[1011010010001011100011]，[1011100010010001011011]，[1100010100010110111001]，[1100010101100110100011]，[1100010110101100100011]，[1100011100100101010011]，[1100011101010010010011]，[1100100011100101010011]，[1100100100101011000111]，[1100100100101011100011]，[1100100111001010001011]，[1100101001101000100111]，[1100101010011100010011]，[1100101011100010010011]，[1100101100101001000111]，[1100111000101010010011]，[1101000100101101100011]，[1101000100110010100111]，[1101000101001110110001]，[1101000101101000110011]，[1101000101101001100011]，[1101001001011100100011]，[1101001010011001000111]，[1101001011100010001101]，[1101011000100101110001]，[1101101000100100011101]，[1110001001010011010011]，[1110001100100010101101]，[1110001100100010110101]，[1110001101000100110101]，[1110010010100111000101]，[1110100010100111001001]，[1010010011101000111001]，[1011000100011101001011]，[1101101001000101100011]。， The method of any one of claims 118-140, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 24. The method of claim 163, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [000110110001011010111010], [000110110011100101101010], [001011011100111010001010], [001101101011010001000111], [001110111001010100110100], [011010100011100010011011], [011100010111001000101101], [100010111010010100111001], [100011000101110110110100], [100011101000110111010010], [100011101100100100101011], [100100101110001100010111], [100101100011011000101011], [100110100110101001000111], [100111001010010111010001], [101001010111000110010011], [101011101001000110110001], [101101001000110001011101], [101101001110010001000111], [110001000110101011001011], [110001010100111010010011], [110001110010001010110110], [110010001011100011010110], [110010010100101110111000], [110100100011011000111010], [110100100100010111001110], [110101000110110001101001], [110101001001001101110001], [110110100100011000101110], [111000101001010011011001], [111001000100011101001011], [111001001110100101000101], [000101110111010100101100], [000110011011101010010110], [000110110011100101010110], [000110110011100101101010], [000110110011100101101101], [000110110011100101110001], [000110110011100101110011], [000110110011100101110100], [000110110011100101110101], [000110110011100101110110], [000110110011100101111001], [000110110011100101111010], [000110110011100101111011], [000110110011100101111100], [000110110011100101111101], [000110110011100101111110], [000110110011100101111111], [000110110011100110001011], [000110110011100110001100], [000110110011100110001101], [000110110011100110001110], [000110110011100110010011], [000110110011100110010100], [000110110011100110010101], [000110110011100110010110], [000110110011100110011011], [000110110011100110011100], [000110110011100110011101], [000110110011100110011110], [000110110011100110100011], [000110110011100110100101], [000110110011100110100110], [000110110011100110100111], [000110110011100110101011], [000110110011100110101100], [000110110011100110101101], [000110110011100110101110], [000110110011100110101111], [000110110011100110110001], [000110110011100110110011], [000110110011100110110100], [000110110011100110110101], [000110110011100110110110], [000110110011100110110111], [000110110011100111001011], [000110110011100111001100], [000110110011100111001101], [000110110011100111001110], [000110110011100111[001001101110001110100101]，[001001110010110001010111]，[001001110111000111010010]，[001100101110101101011000]，[001110001001101101011010]，[001110001001101101101010]，[001110010011101101000101]，[010100101110001110110010]，[010100110001101101110100]，[010100111000101110110010]，[010101101101100100011100]，[010110011100100100010111]，[010110100011100010011011]，[010110100011101000100111]，[010110101001101100111000]，[010110101110001000100111]，[010111000110110001001011]，[010111010010001101100011]，[011000110101101000101110]，[011001100101110101101000]，[011010010101110110011000]，[011010010110001011101100]，[011010011101000100011011]，[011011000110100111010100]，[011011010100010011100011]，[011100111010001001001011]，[100100101110010101000111]，[100100111011010001010011]，[100101001100101110001011]，[100101010001110100100111]，[100101100010111000100111]，[100110010010110101000111]，[101000111001001110110100]，[101001010110010011000111]，[101001011100011101100100]，[101001100011011011101000]，[101010001101001110010011]，[101010010010011011100011]，[101010010110010011000111]，[101011000101100100011101]，[101011010011000100010111]，[101100100010111000110101]，[101100110010100101000111]，[101101000111000100011011]，[101101001000101110110001]，[101101001000111010001101]，[101110001001101000110101]，[101110100011000100101101]，[110001110110010010010101]，[110010101000111010010011]，[110011010001010010100111]，[110100010100101110010011]，[110100011101001100101001]，[110100101011001000111001]，[110100101110001000100111]，[110110001000110100110101]，[110110001000111000101101]，[110110010001110001011010]，[111000101001010011001101]，[111000101011010010011001]，[111000101011010011001001]，[111000110010011010010101]，[111001000111010001101001]，[111001001001100011010101]，[111001001011000101010011]，[111001001011100010101001]，[111001100100010101101001]，[111010001100011101001001]，[111010010100010110011001]，[000101101011101001100110]，[000101110100110011100101]，[000101110101101001100110]，[000101110110110001100101]，[000101110111001101001010]，[000110101101011101001100]，[000110110100011101010110]，[000110110110011100101010]，[000110111000101110010110]，[000110111001010110010110]，[000110111010001110100101]，[000110111010011010100110]，[000110111011100010100101]，[000110111011100010110100]，[000111001101100101011010]，[000111001101100101101010]，[000111010100101100110110]，[000111010100101101100110]，[000111010101100010110110]，[000111010110011010110100]，[000111010110101100100110]，[000111011101001010010011]，[000111011101100011010010]，[000111011101100101001010]，[001001011011100111010001]，[001001101110001110101001]，[001001110111001011001010]，[001001110111010001101001]，[001010111001001110010110]，[001010111011001011000110]，[001011001010100111011100]，[001011010001110111011000]，[001011010100110111000110]，[001011010110011010111000]，[001011011101100011001010]，[001011100010110011010110]，[001011101001010011100110]，[001011101001100111001010]，[001101001010111011101000]，[001101010111000101101100]，[001101010111001011011000]，[001101011101001000110110]，[001101100010110101110100]，[001101100011010011101010]，[001101100111000101011010]，[001101101000110101011100]，[001101101000111010101100]，[001101110011010001011010]，[001101110100011010010110]，[001101110100011100101001]，[001110001101110101001001]，[001110101011000101101100]，[010001011100111011010010]，[010001110110010111001010]，[010010101110001110110010]，[010010110001101110111000]，[010010110111000101110010]，[010010110111001110100010]，[010010110111010001001110]，[010010111000111011100100]，[010011001101011010111000]，[010011011100011101001010]，[010011100111010001011010]，[010011101000111011010010]，[010100010110111001001110]，[010100010111001110110100]，[010100101001101110111000]，[010100101100111011101000]，[010100110001101110110100]，[010100110100111011100100]，[010101001110011011011000]，[010101101001101100111000]，[010110001100110100010111]，[010110010110001000110111]，[010110100010110011101100]，[010110101000111001101100]，[010110101101100100011100]，[010111010110100011011000]，[011000110100110111010100]，[011000111011001010110100]，[011001001101011010111000]，[011001010110010111011000]，[011001011001010110111000]，[011001100101101011101000]，[011001101101001010111000]，[011001110010100101110100]，[011010011010100111011000]，[011010011100100111010100]，[011010101001110011011000]，[011010101110001011011000]，[011010110001110100010011]，[011010110011010001110100]，[011011000100101110101100]，[011011001101001010111000]，[011011010001101010111000]，[011011010001110011101000]，[011100010011011011010100]，[011100100010111011010010]，[011100100111011010001010]，[011101000101101011000110]，[011101000110001001011011]，[100010111001110110100100]，[100011011000100101110101]，[100011011101000100101101]，[100100101011101100011100]，[100100110010110101000111]，[100100111001011000101011]，[100101001110001011101100]，[100101010110001100100111]，[100101011100011101100100]，[100101100010111011100100]，[100101100101011000100111]，[100101101001110100010011]，[100101101010001001100111]，[100110001101011010001011]，[100110011010010100010111]，[100110101001101000100111]，[100110110010100101000111]，[100111000100110101001011]，[100111001001101000101011]，[100111001011001000101011]，[101000101001011100100111]，[101000101101110010011100]，[101001010001110111011000]，[101001010010011011100011]，[101001011100010111011000]，[101001011101000110001101]，[101001011101001100010011]，[101001100011011101101000]，[101001101001110111001000]，[101010110001100100100111]，[101011000110011010001011]，[101011000111010001001101]，[101011001011000100011011]，[101011001110010001001011]，[101011001110010010001011]，[101011010001110001001101]，[101011010110010001000111]，[101011101000110001001011]，[101100010111000100101101]，[101100011000101110100101]，[101100100011100010101101]，[101101000100111010001110]，[101101010001110001001101]，[110001101100010010111010]，[110010001011100101101001]，[110010010111000101010011]，[110010010111001010100011]，[110010011000111010100101]，[110010011100101100010101]，[110010011101001010001011]，[110010100010110111001001]，[110010101000110100100111]，[110010110101000100010111]，[110100010010011100110101]，[110100010110011000110101]，[110100010110101100011001]，[110100100010011100110101]，[110100100011000101110101]，[110100101001100101000111]，[110100110101011000100011]，[110101000100110100111001]，[110101000101100100111001]，[110101000110100111001001]，[110110001000101110010110]，[110110001101001110101000]，[110110010001110001010110]，[111000100010011010110101]，[111000100010011100101101]，[111000100101011001011001]，[111000101001100101001011]，[111001000100011101011010]，[111001000101100101011001]，[111001000101110001011010]，[111001000110101001101001]，[111001001100011010010101]，[111001001100011010101001]，[111001010010100010110011]，[111010001000101011010011]，[111010001000110010110101]，[111010001001001110011010]，[111010001010010110011001]，[111010001011001100011010]，[111010010001001110011010]，[111010100011010011100100]，[111011000100011010011010]，[000101011100101100011011]，[000101101110110001100101]，[000110110100111010101100]，[000111011010100110100110]，[001010110110110010001110]，[001011011011101000110001]，[001011011100100111000101]，[001011101011010001101100]，[010011011101000111001010]，[010101101001110011011000]，[010110100010111001110010]，[011000110110010111010100]，[011010011101000111011000]，[101010010110001100100111]，[110001110110010010100101]，[111000110010011010100101]，[010100111001100101110100]，[100110011010001010010111]，[101001110011001011101000]。， The method of any one of claims 118 to 140, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 26. The method of claim 165, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [01101001000110111010001110], [01110001011101100010010110], [01110001110010001010110110], [01110100011000111011010010], [10001011100111000100101101], [10100101100011101000100111], [10100101110010111000100011], [10110001001011101000111001], [10110001101101000101000111], [10110010001110001110100101], [10111000110001011100100101], [11000100011101001110100101], [11000110011101000101001011], [11000111001010110010001011], [11010010010111010001100011], [11010010100010111001100011], [11011000110110100010100011], [11100010001101010011010011], [11100100010101100011010011], [11100100011011010001010011], [11101000110100011001010011], [01001011011100011000101110], [01100010111011100010110100], [01110001001011011000101110], [01110001011011010001001110], [01110001101101001000101110], [01110010001101011100010110], [10010110100111000100010111], [10011100010111001000101101], [10100011100101101000100111], [10100101110001110110010001], [10110001100011101000101101], [10110001110001011100100101], [10111001101101000101000111], [11000101101101000101000111], [11000110001101001110100101], [11000111001101000101000111], [11010001101101000101000111], [11010010001101001110100101], [11010010100010111001100101], [11011000110110100010100101], [11100010001101001110100101], [11100100010101100011000101], [11100100011011010001000101], [11101000110100011001000101], [01001011011100011000101101], [01100010111011100010110101], [01110001001011011000101101], [01110001011011010001001101], [01110001101101001000101101], [01110010001101011100010101], [10010110100111000100010101], [10011100010111001000101101], [10100011100101101000100101], [10100101110001110110010001], [10110001100011101000101101], [10110001110001011100100101], [10111001101101000101000111], [11000101101101000101000111], [11000110001101001110100101], [11000111001101000101000111], [11010001101101000101000111], [11010010001101001110100101], [11010010100010111001100101], [11011000110110100010100101], [11100010001101001110100101], [11100100010101100011000101], [11100100011011010001000101], [11101000110100011001000101], [01001011011100011000101101], [01100010111011100010110101], [01110001001011011000101101], [01110001011011010001001101], [01110001101101001000101101], [01110010001101011100010101], [100101101[10110010100011100010011101]，[10110100011000111010001011]，[11000100111010100110100011]，[11000101110010110010100011]，[11000101110100101000110011]，[11000110110001010001011011]，[11001000101011100011010011]，[11001000111010010110001011]，[11001010010011101001000111]，[11001010100011100100100111]，[11001011000110101000100111]，[11001011001010110001000111]，[11001100010010110100010111]，[11010001001010110011100011]，[11011010001010001101100011]，[11011100010001011000101101]，[11100010001011101001010011]，[11100010100011011010010011]，[11100010100110100100011011]，[11100010110001011001010011]，[11100100100111000101010011]，[11101000101001000110100111]，[11101001000101001110010011]，[00101101000111011101000110]，[01101000111010110001001110]，[01101001011101000110001110]，[01101101010001001110001110]，[01110001100010111010010110]，[01110001101011001000101110]，[01110010001011011010001110]，[01110010001110100100101110]，[01110011000101101000101110]，[01110100010010110110001110]，[01110100010110100011001110]，[01110100011011010010001110]，[01110101001110001001001110]，[10001001101110001110100101]，[10100100101110100011000111]，[10100100111000111010001101]，[10100100111010001100011101]，[10100100111010001110001101]，[10100101110001110001001101]，[10101100100011100010010111]，[10110001100011010001011101]，[10110100010011101000111001]，[10110100010100011101100011]，[10110100010111000110001101]，[10110100100011100111010001]，[10111001000111000101001101]，[10111010001011000110001101]，[11000101000101101100011011]，[11000101001101001110100011]，[11000101100101011100100011]，[11000110001011101001001011]，[11000110111000101000101101]，[11001000111010100011010011]，[11001001011011000101000111]，[11001001110010100010010111]，[11001010001011011000100111]，[11001010010111010001000111]，[11001010011000101100010111]，[11001010011010001101000111]，[11001011000101011100010011]，[11001011000111010100010011]，[11001100010100101110100011]，[11001100011101000101001011]，[11010001011010011000100111]，[11010001101001011100010011]，[11010001110001101010010011]，[11010010100010111000110011]，[11011000100101100101000111]，[11100010100010110110001101]，[11100011000101110100100101]，[11100100010111000110100101]，[11100100011001011010001011]，[11100100100110001010100111]，[11100101001000110100010111]，[11100101010001100100100111]，[11101000100011100101101001]，[11101000101100010010100111]，[11101000101101001000110011]，[11101001000111000100110101]，[01110100100101110001001110]，[10110001011100011100100101]，[11001001010110001110001011]。， The method of any one of claims 118-140, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 28. The method of claim 167, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1110001010100111001001001101]，[1110101000100101110010011100]， [0001011101011010110001101100]，[0001011101011100101011011000]， [0001011101101010010011100011]，[0001101100110101101011101000]， [0001101101100011101010110100]，[0001101110001101001101010110]， [0001110101011000110110110010]，[0001110101110010001101101001]， [0001110110101001110010110010]，[0010011011100010101101011100]， [0010110111010010001110100011]，[0010111010001011010011100110]， [0010111011001001010110001110]，[0011001110100010111001011010]， [0011001110100101101000101110]，[0011001110101101001011101000]， [0011010111010110100011011000]，[0011100010110101001101110100]， [0011100011011010100100010111]，[0011100100111010010001010111]， [0011100101011101000100100111]，[0011100101110010010111010100]， [0011101000101110111001010010]，[0011101000110111010110010100]， [0011101011010100011101100100]，[0011101011100100011010010110]， [0100010111011000111001011010]，[0100011010110111010001110100]， [0100101101110100010111001100]，[0101001011101001101110011000]， [0101011000110110110010111000]，[0101011100111001001001110100]， [0101101001110001101110100010]，[0101101110001101000100010111]， [0110100100111011000101000111]，[0110100101100010011101011100]， [0111000101000110111011010010]，[0111000110101001001101110100]， [0111010001001110001101001011]，[1000101110100101101000110011]， [1000101110110001110010110100]，[1000111001010110110010001011]， [1000111001010110110100010011]，[1000111010111001000100101101]， [1001001011100110001010100111]，[1001010100110100111000100111]， [1001011001010100111001000111]，[1001110011010100100100010111]， [1010001110010001101101110100]，[1010001110010110110100010011]， [1010010010111011000101100011]，[1010010110001110010001011101]， [1010100011000110110110001011]，[1010110010110010001100010111]， [1010110100010110010001100111]，[1010110100110001100100010111]， [1011001001001110010101000111]，[1011001011000110101001000111]， [1011010010001011101000110011]，[1011010010011100010100011011]， [1011010010011101100010100011]，[1011010100011100010010011011]， [1011010110001000101110100011]，[1100010100011011100101101001]， [1100010100101011100010011011]，[1100010111001000101001101011]， [1100011010100010111011011000]，[1100011101001010110010001011]， [1100100010110110101001110001]，[1100100011010011101010001011]， [1100110001010010110100010111]，[1100110001011101000110100101]， [1101000100110101001011100011]，[1101000101001101001110110001]， [1101000101011100101100010011]，[1101000101101001010001100111]， [1101000101110100101100011001]，[1101001000101101110001011100]， [1101010010100011100010011011]，[1101011001010001001110100011]， [1101100010100101001101000111]，[1101100100011100010100101011]， [1101100100011101010010100011]，[1101100100100011100010101101]， [1110001001110010101001101001]，[1110001011001001001110010101]， [1110001011001010010100011011]，[1110010001110010110010101001]， [1110010010001011101010011100]，[1110010010011100010101001011]， [1110010011001010010100010111]，[1110010011010001010010100111]， [1110010011100010100010010111]，[1110010011101001010001010011]， [1110010100010100101110010011]，[1110010100101000101100100111]， [1110100010010101101100011100]，[1110100010110100101000110011]， [1110100100010100011100100111]，[0001011100111011001011001010]， [0001011101101101010011000110]，[0001011101110100111000100101]， [0001101010111001100010110110]，[0001101011010111010011011000]， [0001101100011101011101101000]，[0001110101110011001001011010]， [0001110110001101010110010110]，[0010100110101110110001011100]， [0010110101011100011011011000]，[0010111001001001110011101010]， [0011001110100010111011010010]，[0011010011011101010010001110]， [0011011000101101011101011000]，[0011011101001001010110001110]， [0011100011101100100101011010]，[0011100101110010001011011010]， [0011101000111011010001001011]，[0101001011001110011011101000]， [0101001101001101110011101000]，[0101101001001100111010111000]， [0101101001110100010111001100]，[0101101101000100111010011100]， [0101110001101110010010001011]，[0110100011101011000100011011]， [0110101000110111011001011000]，[0111000110101001001011101100]， [0111001000110100110101110100]，[0111010001011010010111001100]， [1001001100101011100010100111]，[1001010111001000100110100111]， [1001100011010010111010001011]，[1010010001110010111011101000]， [1010010110001011101000110011]，[1010010110110011000101000111]， [1100010100011011100100101101]，[1100010111010001000110101101]， [1100011010001101110100100101]，[1100100010110110100111000101]， [1100100111010010100010100111]，[1100101100100010101101110001]， [1100110001011101000100101101]，[1101000100100111011000111010]， [1101000110110110001100010101]，[1101000111010001001010011101]， [1110001001010110001101001101]，[1110010110010001001110101001]， [1110011000101001011010001011]，[1110100010100101001100100111]， [1110100010100101001110010011]，[0001010111011010001101100011]， [0001011011101011100011011000]，[0001011101001011010111001100]， [0001011101100111001101001010]，[0001100111010110100101110100]， [0001101001101110110001010110]，[0001101011100010101100110110]， [0001101100010110101110101100]，[0001101100101110101101011000]， [0001101101010011101011101000]，[0001101101110100010101100011]， [0001110100110101101011100100]，[0001110100110110110001101010]， [0010011011011100011101010010]，[0010011011100011101011010100]， [0010011101011010110010111000]，[0010011101011100011011010010]， [0010011101110010100011101001]，[0010110100111000110111010001]， [0010111010110010110001001110]，[0010111011001010110100011100]， [0011011000110101101011101000]，[0011011100101100010101110100]， [0011101011100100011011010010]，[0100101011100011101101100100]， [0100101101100010011101011100]，[0100101101100011101011100100]， [0100110100111001010110111000]，[0101110001101001001011101100]， [0110101011001011000111011000]，[0110110100011001110101011000]， [1000110111001011001010001011]，[1000111011010100010011010011]， [1001011011000100111010111000]，[1001011100010100111011100100]， [1010100111001001001101000111]，[1011010010001001110101110001]， [1011100101001000101110001011]，[1011101000100111000110100101]， [1100010111000100101110110100]，[1100011100100101011011101000]， [1100100111001010010100010111]，[1100101000101001011100100111]， [1100110001011010010111010001]，[1101000100110110101001110001]， [1101001010100011100100100111]，[1101001011000111001000101110]， [1101100010001101011100010110]，[1101100010100011100100101101]， [1110010101000110011101001001]，[1110100010010010101100111001]， [0001101011101011010001101100]，[0010101101011100011101100100]， [0010111010010110101110011000]，[0100101101110110001010001110]， [0110001100101011011011101000]，[0110100110101011000110111000]。 The method of any one of claims 118-140, wherein The length of the first sequence or the base sequence corresponding to the first sequence is 30. The method of claim 169, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [110011100010100010011101001011]，[110100010111001001010011100011]， [110100101110001100010001011101]，[110100101110010001010001110011]， [111001000110001011101001001011]，[111001010001101001001100010111]， [011010011101001000111010001110]，[101100010111000100011100101101]， [101101001110001000111010001101]，[110001011001000111011010100011]， [110001110010100100111010001011]，[110010010001110010101110001011]， [110100011101010011100010010011]，[110110001001110001101000101011]， [111010001100100101100010100111]，[011100010111000100101110010110]， [101001001011100011100010011101]，[101110010001110001110100100101]， [110001010110111000100110100011]，[110100100101110100011000100111]， [110101000101100011100100011011]，[101100010111000111000100101101]， [101101001000111000111010001101]，[111010001010011001000110100111]， [101011011010001000100111000111]，[111000111001000100010110110101]， [111001011000100110010100010111]，[101110001001110100010010010111]。 The method of any one of claims 118-140, wherein The first sequence or the base sequence corresponding to the first sequence has a length of 32. The method of claim 171, wherein the first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [00011100111010001101110100100101]；[00101110100010110101101110011000]； [00110111010010100100111000111010]；[01000111011011100010110110001010]； [01011011010001001110100011000111]；[01011100011100100101001011101100]； [01100010011101011010011010111000]；[01110001110110010001001010010111]； [00010110101101110110010001110001]；[00011001110110101101000101110100]； [00011011010100111000101110100110]；[00011101011001011010111001000110]； [01010001101101000111011011100010]；[01100101110100011100101011011000]； [11100100101011000111010001011001]；[10001110001001101110110101101000]； [10100011100011011010110100010011]；[10100100101110110001011100111000]； [10111000100100011101001001110101]；[11001000101101011011000111000101]； [11010001011101001010010001100111]；[11100010100110100101000110111001]； [11100011000101110010001011011010]；[11100110001001010010111010001011]； [10011010001011100011010100100111]；[10011101100010100101100101000111]； [10101110010010111000100100011101]；[11101001010010001001101110001110]。 The method of any one of claims 118 and 121-140, wherein The first sequence or the base sequence corresponding to the first sequence has an odd length. The method of any one of claims 118 to 173, wherein The first sequence or the base sequence corresponding to the first sequence is an m-sequence. The method according to any one of claims 118, 120 to 140 and 173 to 174, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 7. The method of claim 175, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1001011], [1001110]. The method according to any one of claims 118, 120 to 140 and 173 to 174, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 15. The method of claim 177, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [100010011010111], [100011110101100]. The method according to any one of claims 118, 120 to 140 and 173 to 174, characterized in that The first sequence or the base sequence corresponding to the first sequence has a length of 31. The method of claim 179, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [1000010010110011111000110111010]；[1000010101110110001111100110100]； [1000010110101000111011111001001]；[1000011100110111110100010010101]； [1000011010100100010111110110011]；[1000011001001111101110001010110]。 The method of any one of claims 118 to 173, wherein The first sequence or the base sequence corresponding to the first sequence is a gold sequence. The method of claim 181, wherein The m-sequence associated with the gold sequence has a length of 7, 15 or 31. The method of claim 182, wherein The m-sequence comprises one or more of the following sequences: [1001011]；[1001110]；[100010011010111]；[100011110101100]； [1000010010110011111000110111010]；[1000010101110110001111100110100]； [1000010110101000111011111001001]；[1000011100110111110100010010101]； [1000011010100100010111110110011]；[1000011001001111101110001010110]。 The method of any of claims 118-183, wherein: The synchronization field is an AMP synchronization field; or The first device is an AP and the second device is an AMP device; or The first device is an AMP device and the second device is an AP. The method of any of claims 118-184, wherein: The first PPDU comprises a wideband portion and / or a narrowband portion, and the synchronization field is located in the narrowband portion; or Each portion in the time domain of the first PPDU occupies the same bandwidth; or The first PPDU does not comprise a legacy preamble portion; or The first PPDU only comprises a narrowband portion and does not comprise a wideband portion. The method of claim 185, wherein: The first PPDU is a downlink PPDU, the first PPDU comprises a wideband portion and / or a narrowband portion, and the synchronization field is located in the narrowband portion; or The first PPDU is a downlink PPDU, each portion in the time domain of the first PPDU occupies the same bandwidth, or the first PPDU does not comprise a legacy preamble portion, or the first PPDU only comprises a narrowband portion and does not comprise a wideband portion; or The first PPDU is an uplink PPDU, the first PPDU comprises a wideband portion and / or a narrowband portion, and the synchronization field is located in the narrowband portion. The first PPDU is an uplink PPDU, each part of the first PPDU in time domain occupies the same bandwidth, or the first PPDU does not contain a legacy preamble part, or the first PPDU only contains a narrowband part and does not contain a wideband part. The method of any one of claims 118-186, wherein: The first PPDU is a downlink PPDU, and the second device is an active transmitter or a backscatter communication device; or The first PPDU is an uplink PPDU, and the first device is an active transmitter or a backscatter communication device. The method of any one of claims 118 to 187, wherein The first PPDU includes a fourth sequence, and the fourth sequence satisfies one or more of the following: The fourth sequence includes one or more continuous 01 or 10 sequences. The fourth sequence is used for clock calibration of the second device. The method of claim 188, wherein The fourth sequence is located in the synchronization domain. The method of claim 188 or 189, wherein The fourth sequence is located before or after the first sequence in time domain. The method of claim 188, wherein The fourth sequence is located in an information domain of the first PPDU other than the synchronization domain. The method of claim 191, wherein The information domain in which the fourth sequence is located is before the synchronization domain. The method of any one of claims 118-191, wherein The synchronization domain is the first information domain of the first PPDU in time domain. The method of any one of claims 118-193, wherein The first PPDU includes a fifth sequence, and the fifth sequence satisfies one or more of the following: The fifth sequence is used to identify a starting position of the first sequence. The fifth sequence includes n continuous 0s or n continuous 1s, where n is a positive integer greater than or equal to 1. The fifth sequence is an all-0 sequence or an all-1 sequence, and a duration of the fifth sequence is greater than or equal to m microseconds, where m is a positive integer greater than or equal to 1. The fifth sequence is a predefined sequence. The fifth sequence is located before the first sequence. The method of claim 194, wherein: n is greater than or equal to 3; or m is greater than or equal to 6 microseconds; or m is greater than a time length corresponding to 2 chips in a data domain of the first PPDU. m is greater than or equal to a time length corresponding to 3 chips in the data domain of the first PPDU. m is less than or equal to 9. The method of claim 194 or 195, wherein The fifth sequence is located in the synchronization domain, or the fifth sequence is located in an information domain of the first PPDU other than the synchronization domain. The method of any one of claims 194-196, wherein: The fifth sequence is used to indicate one or more transmission parameters associated with the first PPDU; and / or The fifth sequence includes a plurality of candidate sequences, each candidate sequence of the plurality of candidate sequences corresponds to one or more transmission parameters associated with the first PPDU, and different candidate sequences correspond to different transmission parameters. The method of claim 197, wherein The transmission parameters include one or more of the following: data rate, symbol length, transmission mode, waveform, and coding mode. The method of any one of claims 194-198, wherein A chip duration of the fifth sequence is related to a chip duration of a data domain of the first PPDU. The method of claim 199, wherein The chip duration of the fifth sequence is equal to or different from the chip duration of the data field. The method of claim 199 or 200, wherein The chip duration of the fifth sequence is the corresponding chip duration after the fifth sequence is encoded. The method of any one of claims 194-201, wherein The encoding manner of the fifth sequence is Manchester encoding. The method of any one of claims 194-202, wherein The fifth sequence comprises continuous n 0s or continuous n 1s, and the value of n is related to the value of the first bit of the first sequence. The method of any one of claims 118-203, wherein The first PPDU comprises a sixth sequence, and the sixth sequence satisfies one or more of the following conditions: The sixth sequence is used to identify the ending position of the first sequence. The sixth sequence comprises continuous t 0s or continuous t 1s, and t is a positive integer greater than or equal to 1. The sixth sequence is a full 0 sequence or a full 1 sequence, and the duration of the sixth sequence is greater than or equal to p microseconds, and p is a positive integer greater than or equal to 1. The sixth sequence is a predefined sequence. The sixth sequence is located after the first sequence. The method of claim 204, wherein: t is greater than or equal to 3; or p is greater than the time length corresponding to 2 chips in the data field of the first PPDU; or p is greater than or equal to the time length corresponding to 3 chips in the data field of the first PPDU; or p is less than or equal to 9. The sixth sequence is located in the synchronization field, or the sixth sequence is located in other information field of the first PPDU except the synchronization field. The method of claim 204 or 205, wherein The first sequence is used to indicate the chip duration of the sixth sequence. The method of any one of claims 204-206, wherein The method of any one of claims 204 to 207, wherein: The sixth sequence is used to indicate one or more transmission parameters associated with the first PPDU; and / or The sixth sequence comprises a plurality of candidate sequences, each candidate sequence of the plurality of candidate sequences corresponds to one or more transmission parameters associated with the first PPDU, wherein different candidate sequences correspond to different transmission parameters. The transmission parameters comprise one or more of the following: data rate, symbol length, transmission manner, waveform, and encoding manner. The method of claim 208, wherein The chip duration of the sixth sequence is related to the chip duration of the data field of the first PPDU. The method of any one of claims 204 to 209, wherein The chip duration of the sixth sequence is equal to or different from the chip duration of the data field. The method of claim 210, wherein The chip duration of the sixth sequence is the corresponding chip duration after the sixth sequence is encoded. The method of claim 210 or 211, wherein The encoding manner of the sixth sequence is Manchester encoding. The method of any one of claims 204-212, wherein The sixth sequence comprises continuous t 0s or continuous t 1s, and the value of t is related to the value of the last bit of the first sequence. The method of any one of claims 204-213, wherein The first sequence comprises a first sub-sequence, and the first sub-sequence satisfies one or more of the following conditions: The method of any one of claims 118 to 214, wherein The first sub-sequence is used to identify the starting position of the first sequence. The first sub-sequence comprises continuous r 0s or continuous r 1s, and r is a positive integer greater than or equal to 1. The first sub-sequence is a full 0 sequence or a full 1 sequence, and the duration of the first sub-sequence is greater than or equal to w microseconds, and w is a positive integer greater than or equal to 1. The first sub-sequence is a predefined sequence. The first sub-sequence is located at the front end of the first sequence. The method of claim 215, wherein: ​ r is greater than or equal to 3; or w is greater than or equal to 6 microseconds; or w is greater than a time length corresponding to 2 chips in a data field of the first PPDU; or w is greater than or equal to a time length corresponding to 3 chips in a data field of the first PPDU; or w is less than or equal to 9. The first PPDU comprises a second sub-sequence, the second sub-sequence satisfying one or more of the following: The second sub-sequence is used to identify an ending position of the first sequence; The method of any one of claims 118-216, wherein The second sub-sequence comprises consecutive b 0s or consecutive b 1s, b being a positive integer greater than or equal to 1; The second sub-sequence is an all-0 sequence or an all-1 sequence, and a duration of the second sub-sequence is greater than or equal to q microseconds, q being a positive integer greater than or equal to 1; The second sub-sequence is a predefined sequence; The second sub-sequence is located at a last end of the first sequence. The method of claim 217, wherein: b is greater than or equal to 2 or 3; or q is greater than a time length corresponding to 2 chips in a data field of the first PPDU; or q is greater than or equal to a time length corresponding to 3 chips in a data field of the first PPDU; or q is less than or equal to 9. The method of any of claims 118-136, wherein: a length of the first sequence or a base sequence corresponding to the first sequence is 16; and / or the first sequence or the first sequence comprises 7 or more non-overlapping ‘01’s and / or ‘10’s; and / or the first sequence or the base sequence corresponding to the first sequence comprises 7 or more non-overlapping transitions of ‘01’s and / or ‘10’s. The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The method of claim 219, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [0111010001011010]，[1001011010100011]，[0110100111010100]，[0101101000110011]， [1000101110100101]，[1010010101110001]，[0111000101011010]，[0110010110101010]， [0010101110010110]，[1010011010110001]，[0111000110011010]，[1001101001010101]， [0011001110100101]，[1010100110010110]，[0111001010011010]，[1010010111001100]， [0101011001101001]，[1100110001011010]，[1000110101100101]，[1010010111010001]， [0101100101001110]，[1101010001101001]，[1000111001100101]，[1010011001110001]， [0101101010001110]，[0011100110010110]，[1000111010100101]，[1010101001011001]， [0110100101011100]，[0011101010010110]，[1001011000101011]，[1100010101101001]， [0110100110001011]，[0101010110100110]，[1001011001100011]，[1100011001101001]， [0110100110010101]，[0101100110001110]，[1001011001101010]，[0010111001101001]， [0110100110011100]，[0101101000101110]，[1001011001110100]，[1101000110010110]。 The method of claim 219, wherein The method of any of claims 118-136, wherein: [0111010001011010]，[1000110101100101]，[1000111001100101]，[0101101000101110]， [1001011001101010]，[1000111010100101]，[1001011001100011]，[1001101001010101]， [0011001110100101]，[1001011000101011]，[1010010101110001]，[1010010111001100]， [0101011001101001]，[1010101001011001]，[1010011010110001]，[1100010101101001]， [0110100110001011]，[1100011001101001]，[1101010001101001]，[1101000110010110]。 The method of claim 219, wherein a length of the first sequence or a base sequence corresponding to the first sequence is 16; and / or [0110010010101110]，[1001101001110100]，[0101011011001100]，[0101100011001011]， [1001101101010001]，[1001101010010011]，[0101011100100110]，[0101101000111001]， [0100111010011010]，[1001101011010001]，[0101011100110100]，[0110010110101100]， [0101100111010001]，[1001110100010110]，[0101100110001011]，[0110011101010010]， [0101110001101001]，[1001110100110100]，[0101100110100011]，[0110101000110011]， [0101110100110001]，[1001110101001001]，[0101101000110011]，[0111010011001010]， [0110001110100101]，[1010001100101101]，[0101101101000110]，[1000101100110101]， [0110010101100011]，[1010001100110101]，[0101110010110010]，[1001010111001100]， [0111001010110010]，[1010001101001101]，[0101110011001010]，[1001100010101101]， [0111010001101001]，[1010010010111001]，[0101110011010010]，[1001101001010011]， [0111010100101100]，[1010010111001100]，[0110001010110110]，[1010010111000110]， [1000101011010011]，[1010011001011100]，[0110001011001011]，[1010011100110100]， [1000101110010110]，[1010011001110100]，[0110001011101001]，[1010110011010001]， [1000110101001101]，[1010100011001011]，[0110010100101110]，[1100100110010101]， [1001101010011100]，[1010100011011001]，[0110010101101100]，[1100101011001001]， [1001110001011010]，[1010100100110011]，[0110010110001011]，[1101010011010001]， [1010001011001110]，[1010100100111001]，[0110010110100011]，[0010110101100110]， [1010001110010110]，[1010100110001011]，[0110011010101100]，[0011001101101010]， [1010011000101110]，[1010100110001101]，[0110011010110100]，[0011101010010110]， [1011000101100101]，[1010100110010011]，[0110011011010100]，[0101001011100110]， [0010101100110110]，[1010100110100011]，[0110100101011100]，[0101100101110010]， [0010101101100110]，[1010100110110001]，[0110100110001011]，[0101101000111010]， [0010101110010110]，[1010110011000101]，[0110100111010100]，[0101110001011010]， [0010110010111001]，[1011000110010101]，[0110101001101100]，[0110001011011010]， [0010110011100101]，[1011001010110001]，[0110110010101100]，[0110001101101010]， [0010110011101010]，[1011001011000101]，[0110110011010100]，[0110010011101010]， [0010111001011001]，[1011010011000101]，[0110110101000110]，[0110010101001110]， [0010111001100101]，[1011010100011001]，[0111001001101010]，[0110011101001010]， [0010111001101001]，[1100010110010101]，[0111001010100110]，[0110100010111001]， [0010111001101010]，[1100010110011010]，[0111001101000101]，[0110100111000101]， [0011001110100101]，[1100010110100110]，[0111010001100101]，[0110100111010001]， [0011001110101001]，[1100011010100110]，[0111010010100110]，[0110101011001100]， [0011010010101110]，[1100100101011001]，[0111010011010100]，[1001010100110011]， [0011010101100110]，[1100100110101001]，[0111010100100110]，[1001011000101110]， [0011011001010110]，[1100101010011001]，[1000101011011001]，[1001011000111010]， [0011011010100110]，[1100101101010001]，[1000101100101011]，[1001011101000110]， [0011100101011001]，[1100110001010110]，[1000101101011001]，[1001100010110101]， [0011101001011001]，[1100110001011010]，[1000101110011010]，[1001101010110001]， [0011101001100101]，[1101000110010101]，[1000110010111010]，[1001101100010101]， [0011101001101010]，[1101000110010110]，[1000110101011001]，[1001110010010101]， [0100101011100110]，[1101000110011010]，[1000110110010101]，[1001110100100101]， [0100101100111010]，[1101000110100110]，[1001001010111001]，[1010001110100101]， [0100110100111010]，[1101001100010101]，[1001001100101011]，[1010010111000101]， [0100110101001110]，[1101001100011010]，[1001001101010011]，[1010011010001101]， [0100111001101010]，[1101001101000110]，[1001010110010011]，[1010110100011001]， [0101001100111010]，[1101010001101001]，[1001011000101011]，[1100010101101001]， [0101011001001110]，[1101010010011001]，[1001011001110100]，[1100110010010101]， [0101011001011100]，[1101010011001001]，[1001011010100011]，[1101001010011001]， [0101011001101100]，[0010101100101110]，[1001100100101011]，[0011001101010110]， [0101011001110010]，[0011010100110110]，[1001100101001011]，[0011010110100110]， [0101011001110100]，[0011011001101010]，[1001100101010011]，[1100101001011001]， [0101011011000110]，[0101001100101110]，[1001101001011100]，[1100110010101001]。 The method of claim 219, wherein the first sequence or the first sequence comprises 8 non-overlapping ‘01’s and / or ‘10’s; and / or [1000101110010110]，[1011000101100101]，[0110110101000110]，[0011010101100110]， [1001101101010001]，[1011010100011001]，[0111001101000101]，[0011101001011001]， [0010110101100110]，[1100010110100110]，[0111010001101001]，[0011101010010110]， [0010111001100101]，[1100110001010110]，[0111010010100110]，[0100111010011010]， [0011001101010110]，[1100110001011010]，[0111010100100110]，[0101011100110100]， [0011001110101001]，[1101000110010110]，[0111010100101100]，[0101100101110010]， [0011010010101110]，[1101000110011010]，[1000101011010011]，[0101101000111001]， [0100101011100110]，[1101001100010101]，[1000101011011001]，[0101101101000110]， [0100101100111010]，[1101001101000110]，[1000101101011001]，[0101110011010010]， [0101001011100110]，[1101010010011001]，[1000110101011001]，[0110001010110110]， [0101001100111010]，[0011011001101010]，[1001001010111001]，[0110001011011010]， [0101011011001100]，[0101011001101100]，[1001001100101011]，[0110011010101100]， [0101011100100110]，[0101110001101001]，[1001011000101110]，[0110011010110100]， [0101100110001011]，[0101110100110001]，[1001011101000110]，[0110100111010001]， [0101101000110011]，[0110010011101010]，[1001100100101011]，[0111001010100110]， [0101110011001010]，[0110100111000101]，[1001100101001011]，[1001010100110011]， [0110001011001011]，[1000110010111010]，[1001101001011100]，[1001010111001100]， [0110001011101001]，[1001100101010011]，[1001101011010001]，[1001011000111010]， [0110010010101110]，[1001110001011010]，[1001110100010110]，[1001011001110100]， [0110010100101110]，[1010100100110011]，[1001110101001001]，[1001100010101101]， [0110010101001110]，[1011010011000101]，[1010001100101101]，[1001100010110101]， [0110010110100011]，[1100100110010101]，[1010001100110101]，[1001101010110001]， [0110011011010100]，[1100101010011001]，[1010001110010110]，[1001101100010101]， [0110011101001010]，[1101010011001001]，[1010010010111001]，[1001110100100101]， [0110100101011100]，[0010101101100110]，[1010010111000110]，[1010010111001100]， [0110100110001011]，[0010110011101010]，[1010011001110100]，[1010110100011001]， [0110101000110011]，[0010111001101001]，[1010100011011001]，[1100010101101001]， [0110101011001100]，[0011001101101010]，[1010100110010011]，[1100110010010101]， [0110110011010100]，[0011001110100101]，[1010110011000101]，[1100110010101001]， [1101001010011001]。 the first sequence or the base sequence corresponding to the first sequence comprises 8 non-overlapping transitions of ‘01’s and / or ‘10’s. The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: The method of claim 224, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [0101011001101001]，[0101010110100110]，[1001011001101010]，[1001101001010101]， [0110100110010101]，[0110010110101010]，[1010100110010110]，[1010101001011001]。 The method of claim 224, wherein ​ [1001011001101010]，[1001101001010101]，[1010101001011001]，[0101011001101001]。 The method of claim 224, wherein ​ [0101100110011010]，[0110011001010110]，[1001100101011001]，[1001100101101001]， [0101101001100110]，[0110011001011010]，[1010010110011001]，[1001100110100101]， [0110011010100110]，[0110011010010110]，[1010011001100101]，[1001100110101001]， [0110100110011010]，[0110011010011010]，[0101100101100110]，[1001101001011001]， [0110101001100110]，[0110100101100110]，[0101100110010110]，[1001101010011001]， [1001010110011001]，[1001011010011001]，[0110010101100110]，[1010011001101001]， [1001011001100101]，[1001100101100101]，[0110010110100110]，[1010011010011001]。 The method of claim 224, wherein ​ [0101100101100110]，[0110101001100110]，[0110011001011010]，[1001100110100101]， [0101100110010110]，[1001010110011001]，[0110011010010110]，[1001101001011001]， [0101100110011010]，[1001011001100101]，[0110011010011010]，[1010010110011001]， [0101101001100110]，[1001011010011001]，[0110011010100110]，[1010011001100101]， [0110010101100110]，[1001100101011001]，[0110100101100110]，[1010011001101001]， [0110010110100110]，[1001100101100101]，[0110100110011010]，[1010011010011001]。 The method of any one of claims 118 to 136, wherein The first sequence or the base sequence corresponding to the first sequence comprises a sequence suitable for being received by a first type of receiver and a second type of receiver, wherein the first type of receiver and the second type of receiver satisfy one or more of the following conditions: The first type of receiver has AGC and / or ADC functions; The first type of receiver does not detect the sequence in the synchronization field based on a decoding result of the sequence in the synchronization field; The second type of receiver does not have ACG and / or ADC functions; The second type of receiver detects the sequence in the synchronization field based on a decoding result of the sequence in the synchronization field. The method of claim 229, wherein The decoding manner of the second type of receiver to the sequence in the synchronization field comprises one of the following: Manchester decoding, decoding based on level jump of the sequence in the synchronization field. The method according to any one of claims 118-136 and 229-230, characterized in that: The length of the first sequence or the base sequence corresponding to the first sequence is 24; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 12 non-overlapping '01' and / or '10'; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 12 non-overlapping '01' and / or '10' jumps. The method of claim 231, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [011001011001010101101010]，[100110011001011010010101]， [100110100110101010010101]，[100110011010010110010101]， [010101010110100101100110]，[100110011010010110101010]， [010101011001100110100101]，[100110011010011010010101]， [010101011001101001011010]，[100110011010100101011001]， [010101011010010110100110]，[100110100110011001010110]， [010101100101011001101001]，[100110101001010110011001]， [010101100110011010011010]，[100110101001101010100101]， [010101101010011010011001]，[100110101010100101011001]， [010101101010100110100110]，[100110101010100101101001]， [010110010110010101101010]，[101001010101011001100101]， [010110010110011001101010]，[101001010110010110011010]， [010110011010101001011010]，[101001010110011001100101]， [010110100101010101100110]，[101001010110011010011010]， [010110100101010110011010]，[101001011001100101010101]， [010110100101100110101010]，[101001011001100110010101]， [010110100110011001100101]，[101001011001100110101010]， [011001010110101010100110]，[101001100110010110101010]， [011001011001010110101001]，[101001100110101010100101]， [011001011010010110101010]，[101001101001010110011001]， [011001100101011010011010]，[101001101010010101100110]， [011001100101101010101001]，[101010100101101001100110]， [011001100110101010010110]，[101010100110011010010110]， [011001101001011010101010]，[101010101001011001100101]， [011001101010100101101001]，[010101010110011001011010]， [011001101010101001011010]，[010101011001010110011010]， [011010010101010101100110]，[010101011010011001100101]， [011010010101010110011001]，[010101011010100110100110]， [011010010110011010101001]，[010101100110010110100101]， [011010011001010110010101]，[010101100110011001011010]， [100101100110101001101010]，[010101100110011010010110]， [100101101001100101010110]，[010101101001011001100110]， [100101101010101001100110]，[010101101001101001100110]， [100101101010101010011001]，[010101101010011010011010]， [100110010101010110100101]，[010110010110011010100101]， [100110010101011010010110]，[010110011001011010101010]， [100110010110100101010101]，[010110011001100101011010]， [100110011001010101101001]，[010110011001100110100101]， [100110011010010101010110]，[010110011010100110101010]， [100110011010100101100101]，[010110101010011010100110]， [100110100101101001010101]，[011001010110011001101001]， [100110100110101001010110]，[011001011001010110101010]， [100110101001010101011001]，[011001011010101001100110]， [101001011001100110011010]，[011001100101010101101001]， [101001011010011001010101]，[011001100101010110100110]， [101001011010101001100101]，[011001101001010101010110]， [101001011010101010011001]，[011001101010011010101001]， [101001100101010110100101]，[011001101010101010010110]， [101001101001100110010101]，[011010010101011001100110]， [101001101001101010010101]，[011010010110101010011001]， [101010010101011001011001]，[011010011001101010101001]， [101010010101100101100110]，[011010011010101001010110]， [101010011001100101100101]，[011010100101010110010110]， [101010011010100110010110]，[011010100110011001011001]， [101010100101101001011001]，[011010101001010110010110]， [101010100110010110100101]，[011010101001101010011001]， [101010100110011001011010]，[011010101010010110011001]， [101010101001011010011001]，[011010101010011001101001]， [010101010110100110011010]，[011010101010100101100110]， [010101011001100101101001]，[100101010101011010011001]， [010101011010010110011001]，[100101010101100110010110]， [010110010101101010011001]，[100101010101101001100110]， [010110010110101001100110]，[100101010110010101100110]， [010110011001010101011010]，[100101010110101001101001]， [010110011001101001010101]，[100101011001100110100110]， [010110100110011001010101]，[100101011010101001101001]， [010110100110011001101010]，[100101100101010110101001]， [010110100110011010101010]，[100101100110010101010110]， [010110101001100101100101]，[100101101001010101100110]， [010110101001100110011010]，[100101101010100110011001]， [010110101001101001100101]，[100110010101010101101001]， [010110101010100110011010]，[100110010101100101010110]， [011001010101011010010110]，[100110010110101010101001]， [011001010101011010100110]，[100110011010101001011001]， [011001010110010101011010]，[100110011010101010010110]， [011001010110101001100110]，[100110100101010110011001]， [011001011001100110101001]，[100110100110101001010101]， [011001100101011010100110]，[100110101001100110010110]， [011001100101100101101010]，[101001010101100101011001]， [011001100101101001010101]，[101001100101011001010101]， [011001100101101001101010]，[101001100110011001011010]， [011001100110100101101010]，[101001100110011010100101]， [011001101001101010010101]，[101001100110100101010101]， [011001101010010101100101]，[101001101001100101011010]， [011010010110011001010101]，[101010010101100101100101]， [011010010110011001101010]，[101010010110010110011001]， [011010010110101010100110]，[101010010110100110011001]， [011010011001100101011001]，[101010011001100101101001]， [011010011001100110101001]，[101010011001100110100101]， [011010011010100101010110]，[101010011001101001011010]， [011010100101011001011001]，[101010100101011001011001]， [011010100110011001101001]，[101010100101100110011010]， [011010101001100101101001]，[101010100110101001100101]， [100101010110011010010110]，[101010101001100110100101]， [100101011001100110010110]，[010110100101100110010101]， [100101011010100110100110]，[101001011010011001101010]， [100101100101011010101001]，[010101100101101001100110]， [100101100110011001010110]，[010110011010011010100101]， [100101100110011010100110]，[101001100101100101011010]， [100101101001010101011001]，[101010011010010110011001]， [100101101001100110010101]，[010101100101101010011001]， [100101101001100110101010]，[010101101001011001101010]， [100110010101101010011010]，[010101101001101010011001]， [100110010110010101101010]，[010101101010011001101001]。 The method according to any one of claims 118-136 and 229-230, characterized in that: The length of the first sequence or the base sequence corresponding to the first sequence is 32; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 16 non-overlapping '01' and / or '10'; and / or, The first sequence or the base sequence corresponding to the first sequence comprises 16 non-overlapping '01' and / or '10' jumps. The method of claim 233, wherein The first sequence or the base sequence corresponding to the first sequence comprises one or more of the following sequences: [01010101101001101001100110011010]，[01101010010101010101100101100110]， [01101001100101010110101001101010]，[01101010100101011001010110010110]， [10010110011010101001010110010101]，[01101010100110011001101001011001]， [10101010010110010110011001100101]，[01101010101001011010010110011001]， [01010110101001101001101001100110]，[10010101010110100101101001100110]， [01100101011001011001101010100101]，[10010101011001100110010110100110]， [01100101100101101001010110101010]，[10010101011010100110101001101001]， [01100110101010100110010110100101]，[10010101101010101010011010011001]， [10011001010101011001101001011010]，[10010110010101100101011010101001]， [10011010011010010110101001010101]，[10010110010110101010011001100110]， [10011010100110100110010101011010]，[10011001011001010101010110101001]， [10101001010110010110010110011001]，[10011001011010010101100110101010]， [01010101011010010110100110011010]，[10011001100101101001010101011001]， [01010101100110101001011010011001]，[10011001100101101001101010101001]， [01010101101001011010011001100101]，[10011001100110100110100101010110]， [01010101101010010110100110100110]，[10011001101001101001101010010101]， [01010110101001100110010110010110]，[10011001101010011010011010010101]， [01010110101001101010011010011001]，[10011010010110011001100101010110]， [01011001100101010101101001011010]，[10011010100101010101100110010110]， [01011001100101010110100110101001]，[10100101010101100101100110011010]， [01011001100110100110101010100101]，[10100101010101101001011001100101]， [01011010010101010101100110011010]，[10100101011001010110010110011010]， [01100101100101011001010110101010]，[10100101011001100110011010011010]， [01100101101010100110011001101001]，[10100101101001100101010101100110]， [01100110100110101001101010010101]，[10100110011001011010010101010110]， [01101001011001100110011010101001]，[10100110011010010110101010100101]， [01101001100110100101101010101001]，[10100110100110011001010110101010]， [01101001100110101001010101010110]，[10101001010110011001100101100101]， [01101001101010100101100110011001]，[10101001011001011001100110011010]， [01101010100110011001100101101001]，[10101001101001010101011001100101]， [01101010101001011010011001100101]，[10101010011001100101101001100101]， [01101010101010010101100110010110]，[01010101011010100101101001100110]， [10010101010101101010011001101001]，[01010101101001011001100110011010]， [10010101010110100101100110011010]，[01010110011001100110100110100101]， [10010101011001100110011010010110]，[01011001011001100110010101101010]， [10010110010101011010011001100110]，[01011001100101010101101001101010]， [10010110011001010110101010101001]，[01011001100101101001011010101010]， [10010110011001011010010101010110]，[01011001100110010101011010011010]， [10010110100110011001100101010110]，[01011001100110010110010110101010]， [10011001011001010110010101101010]，[01011001100110011010101001011010]， [10011010010101011001100110010110]，[01011001100110100101101001010101]， [10011010011010100110101001010101]，[01011010011010100101100110010101]， [10100101101010101010011001100101]，[01100110011001010101101001101001]， [10100110011001011001010101011010]，[01100110011010101010010110100110]， [10100110011010101001011001010110]，[01101001011001100110101010101001]， [10100110011010101010010110100101]，[01101001101001100110010101101010]， [10101001010110010101100101100110]，[01101010011010010101011001100101]， [10101001010110011001101001101001]，[01101010100110100101100110011001]， [10101010010101101001011001011001]，[01101010101010011001100101101001]， [10101010010110100101100110011010]，[10010101010101100110011010010110]， [10101010011001010110100101100110]，[10010101011001011010011001100110]， [10101010100101101001011001100101]，[10010101100101101010100110011010]， [01010101101010011001100101100101]，[10010110010110011001101010010101]， [01010101101010011010100110100110]，[10010110100110011001010101010110]， [01010110010101101010100110010110]，[10011001100101010101101001011001]， [01010110100110100110101001100110]，[10011001100110101010010110010110]， [01011001011001100110011010100101]，[10100101100101011010011001101010]， [01011001100110101010101001011010]，[10100110011001011010010110101010]， [01011001101001101010011010100101]，[10100110011001100101010110100101]， [01011010010110101010100110011010]，[10100110011001101001101001010101]， [01011010101001100101100101011001]，[10100110011001101010100101100101]， [01100101010101101001011001100110]，[10100110011010010110100101010101]， [01100101011001011010101001100110]，[10100110011010101010010110010101]， [01100101100101010110101001100110]，[10100110100110011001101010010101]， [01100101101001010101011001100110]，[10101001100110011001011001011010]， [01100110010101101010100110100110]，[10101010010110100110011001100101]， [01100110010110100101011010101010]，[10101010100101011010010110011001]， [01100110010110100101101010101001]，[01010101100101101001100110011010]， [01101001011010011001101010101001]，[01010101100110011001011010011010]， [01101010100101100101100110011001]，[01010110011001011010100110100101]， [01101010101001011010011001101001]，[01011001010110101010100110011010]， [01101010101001100110100101101001]，[01011001100101010101101010011010]， [01101010101010010110100101100110]，[01011001100110010110100110101010]， [10010101010101101001011010011001]，[01011001101001011001100110101010]， [10010101010110011001011010010110]，[01011010011010011001100110010101]， [10010101010110100101100110010110]，[01100101100110010101100110101001]， [10010101011010011010011001100110]，[01100110010101011010011010100110]， [10010110100101100110010101010110]，[01100110011001011010101001101001]， [10011001101001011010010101010110]，[01100110100101101001010101010110]， [10011001101001011010100101010101]，[01101001100110101010100101011001]， [10011001101010010101011001011001]，[01101010011001010110011001011001]， [10011010010110101010100110011001]，[10010101100110101001100110100110]， [10011010011010101001010110011001]，[10010110011001010101011010100110]， [10011010100110100101010110011001]，[10011001011010010110101010101001]， [10011010101010010110100110011001]，[10011001100110100101010110010110]， [10100101010110011010011010100110]，[10011001101010100101100101011001]， [10100101101001010101011001100101]，[10011010011001101010011001010110]， [10100110010110010101100101011010]，[10100101100101100110011001101010]， [10100110011001010101010110100101]，[10100110010110100110011001010101]， [10100110100110011001100101011010]，[10100110011001101001011001010101]， [10101001011001011001010110011001]，[10100110011010101010010101100101]， [10101001101010010101011001101001]，[10100110101001010101011001100101]， [10101010010101100101011001011001]，[10101001100110100101011001011010]， [10101010010101100110011010011010]，[10101010011001100110100101100101]， [01010101100110011010010110011010]，[10101010011010010110011001100101]， [01010110010110101010100110011010]，[01011001011010011001100110101010]， [01010110100110100110011001100101]，[01011001011010101001100110011010]， [01010110101001100110011010011010]，[01011001100110011010011010010101]， [01011001011001100110101001010101]，[01100110011001011010011010101001]， [01011001100101101001010101011010]，[01101001100110011010101001011001]， [01011001100110100101101010101001]，[01101010101001101001011001100110]， [01011010010110011010101010011001]，[10010101010110010110100110011001]， [01011010100110011001100101100101]，[10010110011001100101010110100110]， [01011010100110101001101001100101]，[10011001100110100101100101010110]， [01011010101010010110100110011010]，[10100110011001100101100101101010]， [01011010101010011010011001100101]，[10100110100101010110011001100101]， [01100101011010101010011001101001]，[10100110100101100110011001010101]， [01100101101001100110011010101001]，[01011001100110011010010110101010]， [01100110010101100101100101101010]，[01011010010101011001100110011010]， [01100110010110010110010101101010]，[10100101101010100110011001100101]， [01100110011001011001011010101001]，[10100110011001100101101001010101]， [01100110011010010110010101010110]，[01011010100110011001011001011001]， [01100110011010010110101010100110]，[10100101011001100110100110100110]， [01100110100101101010011001010101]，[01011010101010011001100101100101]， [01100110100110101010101001010110]，[01100110010110010101101010101001]， [01101001101001010101100110011001]，[10011001101001101010010101010110]， [01101001101010011010100101010110]，[10100101010101100110011010011010]。 A communication device characterized by comprising: The communication device is a first device, and the communication device comprises: A communication module, configured to send a first physical layer protocol data unit (PPDU) to a second device; The first PPDU comprises a synchronization field, and the sequence in the synchronization field comprises a first sequence. A communication device characterized by comprising: The communication device is a second device, and the communication device comprises: A communication module, configured to receive a first physical layer protocol data unit (PPDU) sent by a first device; The first PPDU comprises a synchronization field, and the sequence in the synchronization field comprises a first sequence. A communication device characterized by comprising: A communication device comprising a transceiver, a memory and a processor, wherein the memory is configured to store a program, the processor is configured to invoke the program in the memory and control the transceiver to receive or send a signal, so that the communication device performs the method according to any one of claims 1-117 or 118-234. An apparatus, characterized in that A device comprising a processor configured to invoke a program from a memory, so that the device performs the method according to any one of claims 1-117 or 118-234. A chip characterized by including a processor to call a program from a memory to cause a device in which the chip is installed to perform the method of any of claims 1-117 or 118-234. A computer-readable storage medium, characterized by, having a program stored thereon, the program causing a computer to perform the method of any of claims 1-117 or 118-234. A computer program product, characterized by including a program that causes a computer to perform the method of any of claims 1-117 or 118-234. A computer program, characterized in that The computer program causes a computer to perform the method of any of claims 1-117 or 118-234.

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