Communication method, apparatus and device, and medium and program product

Abstract

The present application belongs to the field of wireless communications. Disclosed are a communication method, apparatus and device, and a medium and a program product. The method is executed by a first wireless device, and comprises: receiving a first signal, a time-domain resource used by the first signal comprising N OFDM symbols, each of the N OFDM symbols being used for transmitting a first portion and a second portion, the first portion comprising M modulation symbols, and the second portion being determined on the basis of the first portion, wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1. The second portion can absorb the transmission delay of the first portion and ensure the orthogonality of subcarriers.

Description

Communication method, device, equipment, medium and program product Technical Field

[0001] The present application relates to the field of wireless communications, and in particular to a communication method, apparatus, device, medium, and program product. Background Art

[0002] During signal transmission, multipath effects can negatively impact signal quality. This can be particularly severe for devices that struggle to use DFT (Discrete Fourier Transform) / IDFT (Inverse Discrete Fourier Transform) processing to transmit and receive signals.

[0003] Summary of the Invention

[0004] This application provides a communication method, apparatus, device, medium, and program product, the technical solution of which at least includes:

[0005] According to one aspect of an embodiment of the present application, a communication method is provided. The method is performed by a first wireless device, and the method includes:

[0006] A first signal is received, where the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0007] According to another aspect of an embodiment of the present application, a communication method is provided. The method is performed by a second wireless device, and the method includes:

[0008] Send a second signal, where the second signal includes the first signal, or the second signal includes a superimposed signal of the first signal and an OFDM signal; wherein the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0009] According to one aspect of an embodiment of the present application, a communication device is provided, the device including:

[0010] A receiving module is used to receive a first signal, where the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0011] According to another aspect of an embodiment of the present application, a communication device is provided, the device including:

[0012] A sending module, used to send a second signal, where the second signal includes the first signal, or the second signal includes a superimposed signal of the first signal and the OFDM signal; wherein the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0013] According to one aspect of an embodiment of the present application, a communication device is provided, comprising: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to load and execute the executable instructions to implement the communication method as described in the above aspects.

[0014] According to another aspect of an embodiment of the present application, a communication device is provided, comprising: a receiver; the communication device is configured to implement the communication method as described in the above aspects.

[0015] According to one aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which at least one program is stored. The at least one program is loaded and executed by a processor to implement the communication method as described in the above aspects.

[0016] According to one aspect of an embodiment of the present application, a computer program product or a computer program is provided, wherein the computer program product or the computer program includes computer instructions, wherein the computer instructions are stored in a computer-readable storage medium, a processor obtains the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to implement the communication method as described in the above aspects.

[0017] According to one aspect of an embodiment of the present application, a chip is provided, which includes a programmable logic circuit and / or at least one program, and the chip is used to implement the communication method described in the above aspects based on the programmable logic circuit and / or the at least one program.

[0018] The technical solutions provided by the embodiments of the present application may have the following beneficial effects:

[0019] The setting of the second part provides a time window for the delayed extension component of the previous OFDM symbol to arrive before the start of the next OFDM symbol, avoiding inter-symbol interference caused by delay extension. In addition, the setting of the second part can ensure that the number of waveform periods included in the delayed copy of the OFDM symbol is an integer in the FFT period, which ensures the orthogonality of the subcarriers. Therefore, the setting of the second part can effectively combat the multipath effect, ensure the transmission quality of the first signal, and improve the communication efficiency within the communication system. In particular, for some devices that find it difficult to use DFT / IDFT processing to transmit and receive signals, the setting of the second part provides these devices with a feasible solution for accurately receiving signals. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0021] FIG1 shows a schematic diagram of a wireless communication system provided by an exemplary embodiment of the present application;

[0022] FIG2 shows a schematic diagram of a communication system provided by an exemplary embodiment of the present application;

[0023] FIG3 shows a schematic diagram of radio frequency energy harvesting provided by an exemplary embodiment of the present application;

[0024] FIG4 is a schematic diagram showing a backscatter communication process provided by an exemplary embodiment of the present application;

[0025] FIG5 shows a schematic diagram of resistive load modulation provided by an exemplary embodiment of the present application;

[0026] FIG6 shows a schematic diagram of a topological structure provided by an exemplary embodiment of the present application;

[0027] FIG7 shows a schematic diagram of a topological structure provided by an exemplary embodiment of the present application;

[0028] FIG8 is a schematic diagram showing the format of a PPDU provided by an exemplary embodiment of the present application;

[0029] FIG9 shows a schematic diagram of generating a WUR-Sync field provided by an exemplary embodiment of the present application;

[0030] FIG10 shows a schematic diagram of generating a WUR-Data field provided by an exemplary embodiment of the present application;

[0031] FIG11 is a schematic diagram showing a waveform generator with different rates provided by an exemplary embodiment of the present application;

[0032] FIG12 is a schematic diagram showing a flow chart of a communication method provided by an exemplary embodiment of the present application;

[0033] FIG13 is a schematic diagram showing a flow chart of a communication method provided by an exemplary embodiment of the present application;

[0034] FIG14 shows a schematic diagram of time domain symbols provided by an exemplary embodiment of the present application;

[0035] FIG15 shows a schematic diagram of time domain symbols provided by an exemplary embodiment of the present application;

[0036] FIG16 shows a schematic diagram of time domain symbols provided by an exemplary embodiment of the present application;

[0037] FIG17 shows a schematic diagram of generating time domain symbols provided by an exemplary embodiment of the present application;

[0038] FIG18 shows a schematic diagram of time domain symbols provided by an exemplary embodiment of the present application;

[0039] FIG19 shows a schematic diagram of generating time domain symbols provided by an exemplary embodiment of the present application;

[0040] FIG20 shows a structural block diagram of a communication device provided by an exemplary embodiment of the present application;

[0041] FIG21 shows a structural block diagram of a communication device provided by an exemplary embodiment of the present application;

[0042] FIG22 shows a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application;

[0043] FIG23 shows a schematic structural diagram of a communication device provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0044] To make the objectives, technical solutions, and advantages of the present application more clear, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings. Exemplary embodiments will be described in detail herein, with examples shown in the accompanying drawings. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0045] The terms used in this application are for the purpose of describing specific embodiments only and are not intended to limit this application. As used in this application and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

[0046] It should be understood that although the terms first, second, third, etc. may be used in this application to describe various information, these information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other. For example, without departing from the scope of this application, the first information may also be referred to as the second information, and similarly, the second information may also be referred to as the first information. Depending on the context, the word "if" as used herein can be interpreted as "at the time of" or "when" or "in response to determination". In this specification, when expressing the meaning expressed by a Boolean Value, it will be expressed as "0" for "first meaning" and "1" for "second meaning". Without loss of generality, those skilled in the art will understand that its representative meaning can be swapped, that is, "1" for "first meaning" and "0" for "second meaning".

[0047] The technical solutions described in some embodiments of the present application can be applied to various communication systems, such as: GSM (Global System of Mobile communication) system, CDMA (Code Division Multiple Access) system, WCDMA (Wideband Code Division Multiple Access) system, GPRS (General Packet Radio Service), LTE (Long Term Evolution) system, LTE-A (Advanced long term evolution) system, NR (New Radio) system, NR system evolution system, LTE-U (LTE-based access to unlicensed spectrum, LTE on unlicensed spectrum) system, NR-U (NR-based access to unlicensed spectrum, NR on unlicensed spectrum) system, TN (Terrestrial Networks, terrestrial communication network) system, NTN (Non-Terrestrial Networks, non-terrestrial communication network) system, UMTS (Universal Mobile Telecommunication System, universal mobile communication system), WiMAX (Worldwide Interoperability for Microwave Global Interconnected Microwave Access) communication system, WLAN (Wireless Local Area Networks), Wi-Fi (Wireless Fidelity), 5G (5th-Generation) system, cellular Internet of Things system, cellular passive Internet of Things system, subsequent evolution system of NR system, B5G (Beyond 5th-Generation, beyond 5G) system, 6G and subsequent evolution systems.

[0048] FIG1 shows a schematic diagram of a wireless communication system 100 according to an exemplary embodiment of the present application, which includes at least a wireless device 120 and a wireless device 140. Optionally, wireless device 120 comprises a network device, and wireless device 140 comprises a terminal device. Optionally, both wireless device 120 and wireless device 140 comprise terminal devices. Optionally, wireless device 120 comprises an access point (AP), and wireless device 140 comprises a station (STA).

[0049] The network device in this application supports providing wireless communication functions, including but not limited to: NB (Node B), eNB (Evolved Node B), gNB (Next Generation Node B), RNC (Radio Network Controller), BS (Base Station), BSC (Base Station Controller), BTS (Base Transceiver Station), HNB (Home Evolved Node B or Home Node B), BBU (Baseband Unit), DU (Distributed Unit), wireless relay node, wireless backhaul node, TP (Transmission Point), TRP (Transmission and Reception Point), one or a group of antenna panels of a base station, etc.

[0050] The terminal device in this application may also be referred to as UE (User Equipment), including but not limited to: mobile phones, tablet computers, e-book readers, laptop computers, desktop computers, televisions, VR (Virtual Reality) devices, AR (Augmented Reality) devices, MR (Mediated Reality) devices, XR (Extended Reality) devices, BR (Baffle Reality) devices, CR (Cinematic Reality) devices, DR (Deceive Reality) devices, remote terminals, wireless devices in Industrial Control, set-top boxes, wireless devices in Self Driving, in-vehicle communication devices, handheld devices, wearable devices, wireless devices in Remote Medical, wireless devices in Smart Grid, wireless devices in Transportation Safety, wireless devices in Smart City, or wireless devices in Smart City. Wireless devices in a smart home (such as smart cameras, smart remote controls, smart water and electricity meters, etc.), wireless communication chips, ASICs (Application Specific Integrated Circuits), SoCs (System on Chips), IoT (Internet of Things) nodes, sensors, wireless devices in the IoV (Internet of Vehicles), etc., can also be computing devices with wireless communication capabilities or other processing devices connected to a wireless modem.

[0051] An AP, as used in this application, is a device deployed in a WLAN / Wi-Fi system that provides wireless communication for STAs. An AP acts as a bridge between wired and wireless networks, connecting wireless network clients and then connecting the wireless network to the Ethernet. An AP includes terminal devices or network devices equipped with a WLAN / Wi-Fi chip. Alternatively, an AP includes terminal devices or network devices that support WLAN / Wi-Fi technology. An AP can also be referred to as an AP STA, meaning that, in a sense, an AP is also a type of STA.

[0052] The STA in this application may include AP STA and / or non-AP STA (non-access point station). Non-AP STA may also include terminal devices or network devices with WLAN / Wi-Fi chips. It can also be understood that non-AP STA includes terminal devices or network devices that support WLAN / Wi-Fi technology.

[0053] It is understandable that the role of STA in wireless communication is not absolute. For example, when mobile phone A is connected to a router, mobile phone A is a non-AP STA, but when mobile phone A acts as a hotspot for mobile phone B, mobile phone A plays the role of AP.

[0054] For example, the communication between wireless device 120 and wireless device 140 can be implemented as communication between an AP and a non-AP STA, as communication between a non-AP STA and a non-AP STA, or as communication between a STA and a peer STA. A peer STA refers to a device that communicates with a peer STA, and the peer STA may be an AP or a non-AP STA.

[0055] In some embodiments, the wireless device 120 and / or the wireless device 140 may be a wireless device that supports 3GPP (3rd Generation Partnership Project) related technical specifications.

[0056] In some embodiments, wireless device 120 and wireless device 140 both support 3GPP protocols, but are not limited to 3GPP protocols.

[0057] In some embodiments, wireless device 120 and wireless device 140 may be wireless devices that support relevant IEEE (Institute of Electrical and Electronics Engineers) technical specifications. For example, wireless device 120 and / or wireless device 140 may be devices that support current and future 802.11 family WLAN standards, such as one or more of the following protocols: 802.11ba, 802.11be, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11a, etc. For example, wireless device 120 and wireless device 140 may be deployed in a next-generation WLAN system / next-generation Wi-Fi communication network environment. The next-generation WLAN system is a WLAN system that evolves from the 802.11ax system and is backward compatible with the 802.11ax system. Next-generation Wi-Fi communication refers to any new generation of Wi-Fi communication after Wi-Fi 7 based on the IEEE 802.11be specification, such as UHR (Ultra High Reliability) communication.

[0058] In some embodiments, wireless device 120 and wireless device 140 both support IEEE 802.11 protocol, but are not limited to IEEE 802.11 protocol.

[0059] In some embodiments, the frequency bands supported by the wireless communication system 100 include, but are not limited to, mmWave bands (e.g., 45 GHz, 60 GHz, etc., which are within the 30-300 GHz range) and low-frequency bands. The low-frequency bands include the Sub-7 GHz band (e.g., 2.4 GHz, 5 GHz, 6 GHz, etc., which are within the 1-7.25 GHz range).

[0060] In some embodiments, one or more links exist between wireless device 120 and wireless device 140 .

[0061] In some embodiments, wireless device 120 and wireless device 140 support multi-band communication. For example, communication can be performed simultaneously in at least one of the 2.4 GHz, 5 GHz, 6 GHz, 45 GHz, and 60 GHz frequency bands. Another example is simultaneous communication on different channels within the same frequency band or on different channels within different frequency bands. Multi-band communication can improve the communication throughput and / or reliability between devices. Devices supporting multi-band communication can be considered to have MLO (Multi-Link Operation) capabilities and are typically referred to as multi-band devices or MLDs (Multi-Link Devices), sometimes also referred to as multi-band entities or multi-link entities. An MLD can be an AP or a non-AP STA. If the MLD is an AP, it contains one or more APs; if the MLD is a non-AP STA, it contains one or more non-AP STAs. Multiple links can be formed between the AP in the AP MLD and the STAs in the STA MLD, and the AP in the AP MLD and the STAs in the STA MLD can communicate via the corresponding links.

[0062] Zero-power devices:

[0063] With the development of communication technology and the expansion of communication needs, the demand for low power consumption in communication equipment is becoming increasingly urgent. To this end, zero-power communication technology has been introduced to reduce power consumption on the UE side. Zero-power communication technology can also be referred to as at least one of the following: ultra-low-power communication technology, low-power communication technology, etc. Communication equipment used to implement zero-power communication technology can be referred to as zero-power devices. Zero-power devices can also be referred to as at least one of the following: ultra-low-power devices, low-power devices, etc.

[0064] Specifically, from the perspective of energy sources and usage, zero-power devices can be divided into the following three types:

[0065] (1) Passive devices; Passive devices do not require built-in batteries. When a passive device approaches a network device (such as the reader of an RFID (Radio Frequency Identification) system), the passive device is within the near field formed by the radiation of the network device antenna. Therefore, the antenna of the passive device generates an induced current through electromagnetic induction, and the induced current drives the low-power chip circuit of the passive device. This realizes the demodulation of the forward link signal and the modulation of the backward link signal. For the backscatter link, the passive device can use backscatter or extremely low-power active transmission to transmit the signal. Passive devices do not require built-in batteries to drive either the forward link or the reverse link. Therefore, passive devices can be considered as true zero-power devices.

[0066] In addition to not requiring batteries, the RF circuits and baseband circuits of passive devices are also very simple. For example, they do not require devices such as LNA (Low-Noise Amplifier), PA (Power Amplifier), crystal oscillator, ADC (Analog to Digital Converter), etc., which makes passive devices have many advantages such as small size, light weight, very low price, and long service life.

[0067] Passive devices can also support other energy harvesting methods, by harvesting energy from the environment (such as light energy, heat energy, kinetic energy, mechanical energy, etc.) to obtain energy for driving circuits to achieve communication.

[0068] (2) Semi-passive devices: Semi-passive devices do not have conventional batteries installed. Radio wave energy is collected through a radio frequency energy collection module, or energy in the environment (such as light energy, heat energy, kinetic energy, mechanical energy, etc.) is collected using an energy collection module, and the collected energy is stored in an energy storage unit (such as a capacitor). After the energy storage unit obtains energy, it can drive the low-power chip circuit of the semi-passive device. It can realize the demodulation of the forward link signal and the modulation of the backward link signal. For the backscatter link, the semi-passive device can use backscatter or low-power active transmission to transmit the signal.

[0069] Semi-passive devices require no internal batteries for either the forward or reverse link. While they utilize energy stored in capacitors, this energy is derived from RF energy. Therefore, they can be considered truly zero-power devices. They inherit many of the advantages of passive devices, including small size, light weight, very low price, and long service life.

[0070] (3) Active devices; Active devices can have built-in batteries. The battery is used to drive the low-power chip circuit of the active device. It can realize the demodulation of the forward link signal and the modulation of the reverse link signal. The reverse link signal transmission of the active device can be realized by backscattering without consuming the active device's own power. Alternatively, the active device can realize reverse link transmission by low-power active transmission. Although the battery is built in, this type of active device has extremely low power consumption and complexity, so the battery capacity can be set within a smaller range, thereby achieving smaller cost and size. The built-in battery of the active device can also be used as an energy storage unit to store the ambient energy collected by the energy harvesting module, so that the maintenance cycle of the active device is longer or even maintenance-free.

[0071] Active devices use built-in batteries to increase their communication range and improve communication reliability. Therefore, active devices are used in scenarios with relatively high requirements for communication distance and read latency.

[0072] Specifically, from the perspective of transmitter type, zero-power devices can be divided into the following three types:

[0073] (1) Devices equipped with a backscatter module use the backscatter method described above for uplink transmission. This type of device does not have an active transmitter for active transmission, but only a transmitter with a backscatter module. Therefore, when performing uplink transmission, the network device needs to provide a carrier. This type of device performs backscatter based on the carrier to achieve uplink transmission.

[0074] (2) Devices with active transmitters use active transmitters with active transmission capabilities for uplink transmission. Therefore, when performing uplink transmission, such devices can use their own active transmitters to send uplink data without the need for network equipment to provide a carrier. Active transmitters suitable for such devices include, for example, low-power ASK (Amplitude Shift Keying) transmitters and low-power FSK (Frequency Shift Keying) transmitters. Based on current implementations, when such transmitters transmit a 100μW (microwatt) signal, the overall power consumption of the device can be reduced to 400-600μW.

[0075] (3) Devices that have both backscatter modules and active transmitters support both backscatter and active transmission. This type of device can determine whether to use backscatter or active transmission based on different situations (such as different power levels, different available environmental energy levels), or based on the scheduling of network devices.

[0076] Cellular Passive IoT:

[0077] As communications applications expand, the types of connected objects and application scenarios increase, placing higher demands on the price and power consumption of communications equipment. The application of battery-free, low-cost Passive IoT devices has become a key technology for cellular IoT, expanding the types and number of terminals connected to 5G networks and truly realizing the Internet of Everything. Passive IoT devices can be extended based on these zero-power devices to be suitable for cellular IoT.

[0078] In NR and Wi-Fi systems, the advantages of being battery-free and low-cost enable low-cost, large-scale deployment and maintenance-free IoT devices. Research is currently underway on ambient energy-based IoT devices to address energy supply issues. Ambient energy-based IoT devices, such as A-IoT / Ambient IoT / AMP (Ambient Power Enabled IoT) devices, operate using energy harvested from ambient energy sources, such as radio frequency energy, light energy, solar energy, thermal energy, and mechanical energy. Devices that harvest radio frequency energy to power their own operations may require other devices to provide them with radio frequency power signals.

[0079] These A-IoT devices are similar to passive or semi-passive devices in zero-power communications. They harvest ambient energy and store it in an energy storage unit. Once the energy storage unit receives sufficient energy, it drives low-power circuits for forward link signal demodulation and reverse link signal modulation and transmission.

[0080] In some scenarios, A-IoT devices can be divided into the following three types, each with corresponding complexity and communication capabilities: Device A does not have energy storage capabilities and cannot send independent signals, that is, it uses backscattering transmission; Device B has energy storage capabilities, but cannot send independent signals, that is, it uses backscattering transmission and can use the stored energy to amplify the backscattered signal; Device C has energy storage capabilities and can send independent signals, that is, it has active transmission capabilities.

[0081] Device A has the lowest complexity and power consumption, reaching as low as 1μW. However, its communication range is limited, typically only a few meters. Device A requires a network device to provide a carrier signal for backscattering transmission. Device C typically has a large capacitor to store energy from the environment, consumes hundreds of microwatts, and can support active signal transmission, thus providing a longer communication range. Because Device C can perform active transmission, it does not require a network device to provide a carrier signal for Device C. Device B's complexity and power consumption are between those of Device A and Device C.

[0082] In other scenarios, A-IoT devices can be divided into the following two types. The first type of A-IoT device: 0-1μW peak power consumption, this type of A-IoT device has energy storage, an initial sampling frequency offset (Initial Sampling Frequency Offset) of 10X ppm, no uplink or downlink power amplifiers, and sends uplink transmissions by backscattering an external carrier. The second type of A-IoT device: The peak power consumption is less than a few hundred microwatts. This type of A-IoT device has energy storage, an initial sampling frequency offset of 10X ppm, and may be configured with uplink and / or downlink power amplifiers. Uplink transmissions can be generated internally by the A-IoT device, that is, active transmission, or uplink transmissions can be sent by backscattering an external carrier.

[0083] In general, compared with other IoT devices, A-IoT devices have many advantages such as no need for conventional batteries, no maintenance, small size, low complexity and low cost, and long life cycle.

[0084] In this application, A-IoT devices can be considered equivalent to zero-power devices, or A-IoT devices can be considered to belong to zero-power devices. The following text may mix zero-power devices and A-IoT devices, but those skilled in the art will understand their meaning.

[0085] FIG2 shows a communication system 200 provided by an exemplary embodiment of the present application, which includes a network device 210 and an A-IoT device 220. The network device 210 can be a base station, an AP, or a reader / writer, etc. For details, please refer to the relevant content of the embodiment shown in FIG1.

[0086] The A-IoT device 220 includes an energy harvesting module 321. Optionally, in addition to the energy harvesting module 321, the A-IoT device 220 also includes one or more of a backscatter communication module 322, a logic processing module 323, a sensor module 324, and a memory (not shown in the figure). Exemplarily, the logic processing module 323 includes a low-power computing module. It should be understood that the modules included in the A-IoT device 220 shown in Figure 2 are only examples and not limiting.

[0087] Exemplarily, the energy collection module 321 can collect environmental energy, such as radio frequency energy, light energy, kinetic energy, mechanical energy, solar energy, etc., to power the various modules of the A-IoT device 220. After the A-IoT device 220 obtains energy, it can receive signals from the network device 210 through the receiver, or reflect signals to the network device 210 through the backscatter communication module 322, or transmit signals to the network device 210 through the transmitter (not shown in the figure). The data reflected or transmitted by the A-IoT device 220 can be data stored in itself (such as an identity or pre-written information, such as the production date, brand, manufacturer, etc. of the product). The sensor module 324 can include various sensors, and the A-IoT device 220 can report the data collected by various sensors based on a low-power mechanism. The memory is used to store some basic information (such as item identification, etc.) or obtain sensor data such as ambient temperature and ambient humidity.

[0088] The A-IoT device 220 can use the logic processing module 323 to implement simple signal demodulation, decoding or encoding, modulation and other simple computing tasks. The hardware design can be very simple, making the A-IoT device 220 very low in cost and small in size.

[0089] Figure 3 shows a schematic diagram of radio frequency power harvesting (RFP) performed by energy harvesting module 321. RF energy harvesting is based on the principle of electromagnetic induction. Using the RF module RF, connected in parallel with a capacitor C and a load resistor RL, it harvests electromagnetic wave energy from space, generating the energy needed to power A-IoT devices. This energy is used to drive low-power demodulation modules, modulation modules, sensors, and memory access. This enables A-IoT devices to eliminate the need for traditional batteries.

[0090] In backscatter communication, the backscatter signal can be modulated or unmodulated. Figure 4 shows a schematic diagram of modulated backscatter communication. The TX (Transmit) module 111 of network device 210 uses an AMP (Amplifier) ​​112 to transmit a wireless signal carrier 131. The A-IoT device 220 receives and modulates the wireless signal carrier 131, uses a logic processing module 323 to load the information to be transmitted, and uses an energy harvesting module 321 to harvest radio frequency energy. The A-IoT device 220 uses an antenna 316 to radiate the modulated reflected signal 132. This information transmission process is called backscatter communication. The RX (Receive) module 113 of network device 210 uses an LNA (Low Noise Amplifier) ​​114 to receive the modulated reflected signal 132. Backscatter and load modulation are closely related. Load modulation achieves the modulation process by adjusting and controlling the circuit parameters of the oscillator circuit of the A-IoT device 220 according to the data stream rhythm, causing parameters such as the impedance of the A-IoT device 220 to change accordingly.

[0091] Load modulation technology mainly includes resistance load modulation and capacitance load modulation. Figure 5 shows the principle diagram of resistance load modulation. In resistance load modulation, the load resistor R L The third resistor R3 is connected in parallel, and the switch S based on the binary code control is turned on or off. The on and off of the third resistor R3 will cause the voltage on the circuit to change. The load resistor R L The load resistor R L The first inductor L1 is connected in series with the second resistor R2, and the second resistor R2 is connected in series with the first inductor L1. The first inductor L1 is coupled to the second inductor L2, and the second inductor L2 is connected in series with the second capacitor C2. For example, ASK modulation can be achieved, that is, the amplitude of the backscattered signal of the terminal device is adjusted to achieve signal modulation and transmission. Similarly, in capacitive load modulation, the circuit resonant frequency can be changed by turning the capacitor on and off to achieve FSK modulation, that is, the operating frequency of the backscattered signal of the terminal device is adjusted to achieve signal modulation and transmission.

[0092] The A-IoT device 220 can use load modulation to modulate the incoming signal, thereby realizing the backscatter communication process.

[0093] Therefore, A-IoT devices have the following significant advantages: (1) They do not actively transmit signals, so they do not require complex RF links such as PAs and RF filters; (2) They do not need to actively generate high-frequency signals, so they do not need high-frequency crystal oscillators; (3) With the help of backscatter communication, signal transmission does not consume its own energy. In general, compared with other terminal devices, A-IoT devices have many advantages such as no conventional battery, no maintenance, small size, low complexity and low cost, and long life cycle. They can be widely used in various industries, such as logistics for vertical industries, object recognition, smart warehousing, smart agriculture, energy and power, industrial Internet, etc., as well as smart wearables, smart homes, smart control, and environmental monitoring, positioning and other services.

[0094] Encoding method:

[0095] In the wireless communication system 100 shown in FIG1 or the zero-power communication system shown in FIG2 , different codes can be used to represent binary "1" and "0," that is, different pulse signals are used to represent "0" and "1." Commonly, one of the following encoding methods is used: non-return to zero (NRZ) encoding; Manchester encoding; unipolar return to zero (URZ) encoding; differential binary phase (DBP) encoding; Miller encoding; and differential encoding.

[0096] Topology:

[0097] In the communication system 200 shown in FIG2 , the communication between the network device 210 and the A-IoT device 220 can be direct communication or indirect communication.

[0098] For direct communication, see the topology shown in Figure 6. Network device 210 and A-IoT device 220 engage in bidirectional communication. Network device 210 can directly send data and / or signaling to A-IoT device 220, and A-IoT device 220 can also directly send data and / or signaling to network device 210. Furthermore, the network device that sends data and / or signaling to A-IoT device 220 may be different from the network device that receives data and / or signaling from A-IoT device 220.

[0099] For indirect communication, refer to the topology shown in Figure 7. Network device 210 and A-IoT device 220 communicate through intermediate node 230. Intermediate node 230 transmits data and / or signaling between network device 210 and A-IoT device 220. An intermediate node can be, for example, at least one of the following: a relay, an integrated access backhaul (IAB) node, a UE, or a repeater.

[0100] Business characteristics:

[0101] A-IoT devices may participate in the following types of services:

[0102] Device-Originated (DO): For A-IoT devices, DO refers to the signaling / data services sent by the A-IoT device to network devices and / or intermediate nodes. This service can be initiated proactively by the A-IoT device or triggered by the A-IoT device. Examples include A-IoT data reporting, data transmission, and signaling transmission.

[0103] Device-Terminated (DT): For A-IoT devices, this refers to the signaling / data services sent by network devices and / or intermediate nodes to the A-IoT device. For example, a network device sends control signaling to an A-IoT device, and the A-IoT device responds with an action.

[0104] DO-A (Device-Originated Autonomous): For A-IoT devices, this refers to services in which the A-IoT device autonomously sends signaling / data to network devices and / or intermediate nodes. This is a type of DO service. For example, an A-IoT device sends alarm information to network devices and / or intermediate nodes.

[0105] DO-DTT (Device-Terminated Triggered): Services initiated and terminated by A-IoT devices, triggered by network devices and / or intermediate nodes. For example, asset inventory services.

[0106] WUR (Wake-up Radio):

[0107] The WUR mechanism is an energy-saving mechanism. Unlike traditional receivers, WUR does not need to be turned on or off to save power. Instead, it can be awakened by a wake-up signal at any time.

[0108] Figure 8 shows a schematic diagram of the format of the PPDU in the WUR mechanism provided by an exemplary embodiment of the present application. The PPDU includes one or more of the following fields: L-STF (Legacy Short Training Frame), L-LTF (Legacy Long Training Frame), L-SIG (Legacy Signal), BPSK-Mark (Binary Phase Shift Keying Mark) 1, BPSK-Mark2, WUR-Sync (Synchronization), and WUR-Data.

[0109] The length of the WUR-Sync field is 64μs or 128μs, which is determined by the data rate of the WUR-Data field.

[0110] The WUR-Sync field and the WUR-Data field use OOK (On-Off Keying) modulation for data transmission. The logic bit "1" is modulated into the 'OOK-On' symbol, and the time domain waveform is represented by 'On-WG (On Waveform Generator)'; the logic bit "0" is modulated into the 'OOK-Off' symbol, and the time domain waveform is represented by 'Off-WG (Off Waveform Generator)'. The WUR signal generator of the WUR-Sync field is shown in Figure 9, and the WUR signal generator of the WUR-Data field is shown in Figure 10. Unlike the WUR-Sync field, the information bits (Information Bits) of the WUR-Data field need to be encoded by the WUR encoder (Encoder) before OOK modulation, that is, before switching between On-WG and Off-WG. After OOK modulation, the coded bits of the WUR-Sync sequence and WUR-Data field need to be windowed, analog and RF processed to obtain the WUR PPDU.

[0111] WUR's PPDU can be used with a 20MHz channel bandwidth, or it can use FDMA (Frequency Division Multiple Access) design to make it suitable for 40MHz and 80MHz channel bandwidths. With a subcarrier spacing of 312.5kHz, there are 64 subcarriers in a 20MHz bandwidth.

[0112] The WUR-Sync and WUR-Data fields support two rates: LDR (Low Data Rate) and HDR (High Data Rate). The waveform generators for different rates are also different, as shown in Figure 11.

[0113] Figure 11 (a) shows the On-WG of the PPDU used by the WUR-Sync field and the WUR-Data field using HDR. For a single 20MHz WUR channel, a 2μs zero-energy waveform is generated by the Off-WG to construct a 2μs MC-OOK Off (Multicarrier OOK Off) symbol. The central 13 subcarriers of the 64-point IDFT (Inverse Discrete Fourier Transform) are used to generate the On-WG waveform, and a 2μs time domain MC-OOK On symbol is constructed. The sampling process of MC-OOK On is as follows:

[0114] The six subcarriers with subcarrier index k = (-6, -4, -2, 2, 4, 6) use non-zero inputs, and the other subcarriers use null inputs.

[0115] The coefficients of the non-zero subcarriers are selected from symbols of any of the following constellations: BPSK, QPSK (Quadrature Phase Shift Keying), 16-QAM (Quadrature Amplitude Modulation), 64-QAM, and 256-QAM.

[0116] Select the first 32 values ​​of the 64-point IDFT output.

[0117] These 32 values ​​are processed by the Symbol Randomizer.

[0118] The last 8 samples of the 32 samples are added before the 32 samples as a GI (Guard Interval), resulting in a total of 40 samples, representing a MC-OOK On symbol with a duration of 2 μs.

[0119] Figure 11(b) shows the On-WG of the PPDU used in the WUR-Data field using LDR. For a single 20MHz WUR channel, a 4μs MC-OOK Off symbol is constructed using a 4μs zero-energy waveform generated by the Off-WG. The On-WG waveform is generated using the central 13 subcarriers of the 64-point IDFT, and a 4μs MC-OOK On symbol is constructed. The sampling process of the MC-OOK On symbol is as follows:

[0120] The 12 subcarriers with subcarrier index k = (-6, -5, -4, -3, -2, -1, 1, 2, 3, 4, 5, 6) use non-zero inputs, and the other subcarriers use null inputs.

[0121] • The coefficients of the non-zero subcarriers are selected from symbols of any of the following constellations: BPSK, QPSK, 16-QAM, 64-QAM, and 256-QAM.

[0122] The 64 values ​​of the 64-point IDFT are processed by the symbol randomizer.

[0123] The last 16 samples of these 64 samples are added before the 64 samples as GI, resulting in a total of 80 samples, representing the MC-OOK On symbol with a duration of 4 μs.

[0124] CP (Cyclic Prefix):

[0125] For any physical channel or signal except PRACH (Physical Random Access Channel), the OFDM symbol in the subframe A time-continuous signal at antenna port p and subcarrier spacing configuration u It is defined as the following formulas (1) to (4).

[0126] Where t=0 is at the beginning of the subframe.

[0127] There are two types of CPs: normal CP (normal cyclic prefix) and extended CP (extended cyclic prefix). Extended CP is generally used only at specific subcarrier spacings (e.g., Δf = 60 kHz). The CP lengths for different subcarrier spacings can be calculated using the following equations (5) and (6).

[0128] As mentioned above, A-IoT devices are relatively simple, and the signals they transmit and receive typically use simple modulation schemes, such as OOK modulation, PSK (Phase Shift Keying), BPSK modulation, or FSK modulation. A-IoT devices can receive data through envelope detection.

[0129] During signal transmission, multipath can cause interference issues such as ISI (Inter-Symbol Interference) and ICI (Inter-Carrier Interference), which can negatively impact signal transmission quality. For low-complexity A-IoT devices, it's difficult to use DFT (Discrete Fourier Transform) / IDFT processing to transmit and receive signals like traditional UEs. The negative impact of multipath can be even more severe, leading to an urgent need to consider how to prevent interference and ensure transmission quality for A-IoT devices.

[0130] FIG12 is a flow chart of a communication method provided by an exemplary embodiment of the present application. The method is performed by a first wireless device and includes at least some of the following steps:

[0131] Step 1220: Receive a first signal, where the time domain resources used by the first signal include N OFDM symbols, each OFDM symbol is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part.

[0132] Wherein, N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0133] In some embodiments, the second part is determined based on the first part, which can be understood as the second part being associated with the first part; it can also be understood as the second part being determined based on a certain segment of the first part; it can also be understood as the second part being the same as a certain part of the first part; it can also be understood as the second part being the same as a certain segment of the first part; it can also be understood as the waveform of the second part being the same as the waveform of a certain part of the first part.

[0134] In some embodiments, the second part includes at least one of the following: CP, GI, GT (Guard Time), and GP (Guard Period).

[0135] In some embodiments, the first portion is used to carry data information and / or control information.

[0136] In some embodiments, the modulation symbol includes at least one of the following symbols: an OOK symbol, a PSK symbol, a BPSK symbol, and an FSK symbol.

[0137] In some embodiments, within each OFDM symbol, the second portion precedes the first portion, or the second portion follows the first portion.

[0138] In some embodiments, the second part can be understood as a signal segment of the first signal, or can be understood as a sub-signal of the first signal.

[0139] In some embodiments, the first wireless device may be a terminal device or a non-AP Station as shown in FIG. 1 , or a network device or an AP as shown in FIG. 1 , or a network device as shown in FIG. 2 .

[0140] In some embodiments, the first wireless device includes at least one of the following: an A-IoT device, an AMP device, a passive IoT device, a zero-power device, a low-power device, an ultra-low-power device, or an LP-WUR (Low Power Wake-up Receiver).

[0141] It can also be understood that the first wireless device supports at least one of the following communication methods: zero-power communication, low-power communication, ultra-low-power communication, communication based on LP-WUS (Low Power Wake-up Signal, low-power wake-up signal), passive Internet of Things communication, AMP communication, WLAN communication, Wi-Fi communication, and 3GPP-specified communication methods (such as 4G, 5G, B5G, 6G and later communication methods).

[0142] In some embodiments, the energy used by the first wireless device for communication comes from ambient energy collected by the first wireless device. The ambient energy includes, for example, at least one of the following: radio frequency energy, light energy, solar energy, thermal energy, mechanical energy, kinetic energy, etc.

[0143] In some embodiments, the collection of wireless RF energy is based on wireless RF signals in the environment, such as RF signals of other communication systems, broadcast telecommunications, etc. In this case, the energy collection method of the first wireless device can be considered passive.

[0144] In some embodiments, the wireless RF energy is collected based on in-band wireless RF signals, such as signals transmitted using time-frequency resources within the communication system, which helps ensure energy collection efficiency and reliability.

[0145] In some embodiments, the first wireless device supports backscatter and / or active transmission communication modes. If the first wireless device adopts the backscatter communication mode, it needs to be provided with a carrier signal from the outside.

[0146] An OFDM symbol can be understood as a time domain unit with a certain time domain length. Optionally, the time domain length of an OFDM symbol is associated with the subcarrier spacing. For example, the larger the subcarrier spacing, the shorter the time domain length of an OFDM symbol. In the present application, the time domain resources used by the first signal are not limited to the OFDM symbol as a time domain unit. Other time domain units are also applicable to the embodiments of the present application. Other time domain units include, for example, at least one of the following: frame, subframe, slot, mini-slot, sub-slot, symbol group, etc.

[0147] From the perspective of frequency bands, the first signal can be sent in a millimeter wave band (such as 45 GHz, 60 GHz, etc., which are in the range of 30 to 300 GHz) or in a non-millimeter wave band. Non-millimeter wave bands include low-frequency bands (such as 2.4 GHz, 5 GHz, 6 GHz, etc., which are in the range of 1 to 7.25 GHz), or new frequency bands that may be planned in the future that are different from millimeter wave bands.

[0148] From the perspective of waveform, the waveform of the first signal can be a sine wave, a square wave, a triangle wave, a pulse, a rectangular wave, etc. The waveform of the first signal can be continuous or discontinuous, that is, the first signal is allowed to be interrupted within a certain time domain range.

[0149] In some embodiments, the number of the first wireless devices is one or more.

[0150] In summary, the method provided in the embodiment of the present application, the setting of the second part, provides a time window for the delay spread component of the previous OFDM symbol to arrive before the start of the next OFDM symbol, thereby avoiding inter-symbol interference caused by delay spread. In addition, the setting of the second part can ensure that the number of waveform periods included in the delayed replica of the OFDM symbol is an integer in the FFT period, which ensures the orthogonality of the subcarriers. Therefore, the setting of the second part can effectively combat the multipath effect, ensure the transmission quality of the first signal, and improve the communication efficiency within the communication system.

[0151] FIG13 is a flow chart of a communication method provided by an exemplary embodiment of the present application. The method is performed by a second wireless device and includes at least some of the following steps:

[0152] Step 1320: Send a second signal, where the second signal includes the first signal, or the second signal includes a superimposed signal of the first signal and the OFDM signal; wherein the time domain resources used by the first signal include N OFDM symbols, each OFDM symbol is used to transmit the first part and the second part, the first part includes M modulation symbols, and the second part is determined based on the first part.

[0153] Wherein, N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0154] In some embodiments, the second signal is the first signal, and the time domain resources used by the first signal are also the time domain resources used by the second signal.

[0155] In some embodiments, the first signal is a signal sent to an A-IoT device or an LP-WUR device, such as a LP-WUS (Low Power Wake-Up Signal), a WUR PPDU, and the like.

[0156] In some embodiments, the first signal is a combination of a signal sent to an A-IoT device or LP-WUR device and a legacy signal, and the second wireless device uniformly sets the second portion of the combined signal. For example, the second wireless device uniformly performs IFFT on both the LP-WUR and legacy NR signals and appends the second portion. For another example, the second wireless device uniformly performs IFFT on both the WUR PPDU and legacy PPDU and appends the second portion.

[0157] In some embodiments, the second signal is a superimposed signal. Furthermore, the first signal is different from the OFDM signal. The difference between the first signal and the OFDM signal is reflected in at least one or more of the following aspects: different information carried, different modulation methods, different coding methods, different waveforms, different receivers, different ways of setting the second part, different time domain resources used, and different frequency domain resources used. The reason for designing such a second signal is that from the perspective of the transmitter, the superimposed signal can improve the utilization rate of transmission resources and improve the communication efficiency within the system, and the superimposed signal may have a better ability to combat multipath effects. It can be understood that whether the second wireless device sends the first signal or the superimposed signal depends on the specific implementation and communication requirements, and the embodiments of the present application do not limit this.

[0158] Exemplarily, the second signal is a superposition of the first signal and an OFDM signal. The time domain resources used by the OFDM signal include Y OFDM symbols, each of which is used to transmit the third part and the fourth part. The third part is determined based on the end of the fourth part, and the fourth part carries data information and / or control information. For example, the Z time domain sampling points at the end of the fourth part are copied to the beginning of the fourth part to form the third part. Where Y is an integer greater than or equal to 1, and Z is an integer greater than or equal to 1.

[0159] In some embodiments, the second part is determined based on the first part, which can be understood as the second part being associated with the first part; it can also be understood as the second part being determined based on a certain segment of the first part; it can also be understood as the second part being the same as a certain part of the first part; it can also be understood as the second part being the same as a certain segment of the first part; it can also be understood as the waveform of the second part being the same as the waveform of a certain part of the first part.

[0160] In some embodiments, the second portion includes at least one of the following: CP, GI, GT, GP.

[0161] In some embodiments, the first portion is used to carry data information and / or control information.

[0162] In some embodiments, the modulation symbol includes at least one of the following symbols: an OOK symbol, a PSK symbol, a BPSK symbol, and an FSK symbol.

[0163] In some embodiments, within each OFDM symbol, the second portion precedes the first portion, or the second portion follows the first portion.

[0164] In some embodiments, the second part can be understood as a signal segment of the first signal, or can be understood as a sub-signal of the first signal.

[0165] In some embodiments, the second wireless device may be a terminal device or a non-AP Station as shown in FIG. 1 , or a network device or an AP as shown in FIG. 1 , or a network device as shown in FIG. 2 .

[0166] In some embodiments, the second wireless device includes at least one of the following: an A-IoT device, an AMP device, a passive IoT device, a zero-power device, a low-power device, an ultra-low-power device, or a LP-WUR device.

[0167] It can also be understood that the second wireless device supports at least one of the following communication methods: zero-power communication, low-power communication, ultra-low-power communication, LP-WUS-based communication, passive Internet of Things communication, AMP communication, WLAN communication, Wi-Fi communication, and 3GPP-specified communication methods (such as 4G, 5G, B5G, 6G and later communication methods).

[0168] In some embodiments, the energy used by the second wireless device for communication comes from ambient energy collected by the first wireless device. The ambient energy may include at least one of the following: radio frequency energy, light energy, solar energy, thermal energy, mechanical energy, kinetic energy, etc.

[0169] In some embodiments, the collection of wireless RF energy is based on wireless RF signals in the environment, such as RF signals of other communication systems, broadcast telecommunications, etc. In this case, the energy collection method of the second wireless device can be considered passive.

[0170] In some embodiments, the wireless RF energy is collected based on in-band wireless RF signals, such as signals transmitted using time-frequency resources within the communication system, which helps ensure energy collection efficiency and reliability.

[0171] In some embodiments, the second wireless device supports backscatter and / or active transmission communication modes. If the second wireless device adopts the backscatter communication mode, it needs to be provided with a carrier signal from the outside.

[0172] An OFDM symbol can be understood as a time domain unit with a certain time domain length. Optionally, the time domain length of an OFDM symbol is associated with the subcarrier spacing. For example, the larger the subcarrier spacing, the shorter the time domain length of an OFDM symbol. In the present application, the time domain resources used by the first signal are not limited to the OFDM symbol as a time domain unit. Other time domain units are also applicable to the embodiments of the present application. For example, other time domain units include at least one of the following: frame, subframe, time slot, mini time slot, sub-time slot, symbol group, etc.

[0173] From the perspective of frequency bands, the second signal can be sent in millimeter wave bands (such as 45 GHz, 60 GHz, etc., which are in the range of 30 to 300 GHz) or in non-millimeter wave bands. Non-millimeter wave bands include low-frequency bands (such as 2.4 GHz, 5 GHz, 6 GHz, etc., which are in the range of 1 to 7.25 GHz), or new frequency bands that may be planned in the future that are different from millimeter wave bands.

[0174] From the perspective of waveform, the waveform of the second signal can be a sine wave, a square wave, a triangle wave, a pulse, a rectangular wave, etc. The waveform of the second signal can be continuous or discontinuous, that is, the second signal is allowed to be interrupted within a certain time domain range.

[0175] In some embodiments, the number of the second wireless devices is one or more.

[0176] In summary, the method provided in the embodiment of the present application, the setting of the second part, provides a time window for the delay spread component of the previous OFDM symbol to arrive before the start of the next OFDM symbol, thereby avoiding inter-symbol interference caused by delay spread. In addition, the setting of the second part can ensure that the number of waveform periods included in the delayed replica of the OFDM symbol is an integer in the FFT period, which ensures the orthogonality of the subcarriers. Therefore, the setting of the second part can effectively combat the multipath effect, ensure the transmission quality of the first signal, and improve the communication efficiency within the communication system.

[0177] Next, based on the embodiments shown in FIG. 12 and FIG. 13 , how to set the second part within the OFDM symbol is further introduced.

[0178] In some embodiments, the second portion is determined based on at least one of the following: a first modulation symbol, a second modulation symbol, and a third modulation symbol. The first modulation symbol is the first modulation symbol among the M modulation symbols; the second modulation symbol is any modulation symbol among the M modulation symbols except the first modulation symbol; and the third modulation symbol is the last modulation symbol among the M modulation symbols. In practice, the third modulation symbol can be considered a special type of the second modulation symbol.

[0179] In some embodiments, the second part is determined based on the first modulation symbol, which can be understood as at least one of the following situations: the second part is the same as the starting part of the first modulation symbol; the second part is the same as the ending part of the first modulation symbol; the waveform of the second part is the same as the waveform of the starting part of the first modulation symbol; the waveform of the second part is the same as the waveform of the ending part of the first modulation symbol; the sampling points included in the second part are the same as the sampling points of the starting part included in the first modulation symbol; the sampling points included in the second part are the same as the sampling points of the ending part included in the first modulation symbol.

[0180] In some embodiments, the second portion is determined based on X time-domain sampling points starting from the first modulation symbol. For example, the X time-domain sampling points starting from the first modulation symbol are copied to a position before the first modulation symbol (i.e., M modulation symbols before the first modulation symbol) to form the second portion. Where X is an integer greater than or equal to 1.

[0181] In some embodiments, the second portion is determined based on the last X time-domain sampling points within the first modulation symbol. For example, the last X time-domain sampling points within the first modulation symbol are copied to the beginning of the first modulation symbol to form the second portion, where X is an integer greater than or equal to 1.

[0182] In some embodiments, the second part is determined according to the third modulation symbol, which can be understood as at least one of the following situations: the second part is the same as the starting part of the third modulation symbol; the second part is the same as the ending part of the third modulation symbol; the waveform of the second part is the same as the waveform of the starting part of the third modulation symbol; the waveform of the second part is the same as the waveform of the ending part of the third modulation symbol; the sampling points included in the second part are the same as the sampling points included in the starting part of the third modulation symbol; the sampling points included in the second part are the same as the sampling points included in the ending part of the third modulation symbol.

[0183] In some embodiments, the second portion is determined based on X time-domain sampling points starting from the third modulation symbol. For example, the X time-domain sampling points starting from the third modulation symbol are copied to a position before the third modulation symbol to form the second portion, where X is an integer greater than or equal to 1.

[0184] In some embodiments, the second portion is determined based on the last X time-domain sampling points within the third modulation symbol. For example, the last X time-domain sampling points within the third modulation symbol are copied to the beginning of the third modulation symbol to form the second portion, where X is an integer greater than or equal to 1.

[0185] In some embodiments, the case where the second part is determined based on the second modulation symbol is similar to the case where the second part is determined based on the third modulation symbol, and will not be repeated here.

[0186] In some embodiments, the value of X is determined by a communication protocol, configured by the second wireless device, associated with a transmission rate of the first signal, or associated with a subcarrier spacing in a frequency domain resource used by the first signal. For example, the larger the subcarrier spacing in the frequency domain resource used by the first signal, the smaller the value of X and the smaller the length of the second portion.

[0187] In some embodiments, the second part is determined based on the first modulation symbol and / or the second modulation symbol, which can be understood as at least one of the following situations: the time domain length of the second part is associated with the time domain length of the first modulation symbol and the time domain length of the second modulation symbol; the number of time domain sampling points corresponding to the second part is associated with the number of time domain sampling points corresponding to the first modulation symbol and the number of time domain sampling points corresponding to the second modulation symbol; the second part is the same as the starting part of the first modulation symbol; the second part is the same as the ending part of the first modulation symbol; the waveform of the second part is the same as the waveform of the starting part of the first modulation symbol; the waveform of the second part is the same as the ending part of the first modulation symbol The waveform of the second part is the same as that of the starting part of the second modulation symbol; the sampling points included in the second part are the same as the sampling points of the starting part of the first modulation symbol; the sampling points included in the second part are the same as the sampling points of the ending part of the first modulation symbol; the second part is the same as the starting part of the second modulation symbol; the second part is the same as the ending part of the second modulation symbol; the waveform of the second part is the same as the waveform of the starting part of the second modulation symbol; the waveform of the second part is the same as the waveform of the ending part of the second modulation symbol; the sampling points included in the second part are the same as the sampling points of the starting part of the second modulation symbol; the sampling points included in the second part are the same as the sampling points of the ending part of the second modulation symbol.

[0188] The time domain length of the second part is associated with the time domain length of the first modulation symbol and the time domain length of the second modulation symbol. For example, it can be understood that the sum of the time domain length of the second part and the time domain length of the first modulation symbol is equal to the time domain length of the second modulation symbol. For another example, it can be understood that the sum of the time domain length of the second part, the time domain length of the first modulation symbol, and the time domain lengths of M-1 second modulation symbols is equal to the time domain length of one OFDM symbol.

[0189] The number of time-domain sampling points corresponding to the second part is associated with the number of time-domain sampling points corresponding to the first modulation symbol and the number of time-domain sampling points corresponding to the second modulation symbol. For example, it can be understood that the sum of the number of time-domain sampling points corresponding to the second part and the number of time-domain sampling points corresponding to the first modulation symbol is equal to the number of time-domain sampling points corresponding to the second modulation symbol. For another example, it can be understood that the sum of the number of time-domain sampling points corresponding to the second part, the number of time-domain sampling points corresponding to the first modulation symbol, and the number of time-domain sampling points corresponding to M-1 second modulation symbols is equal to the number of time-domain sampling points corresponding to one OFDM symbol.

[0190] Based on the above, this application provides the following five specific solutions for setting the second part within the OFDM symbol. For ease of explanation, the following uses the modulation symbol as an example. The envelope of the OOK-On symbol is displayed as a high level, and the envelope of the OOK-Off symbol is displayed as a low level.

[0191] Solution 1: The second part is set in units of modulation symbols, and the second part is determined according to the end part of the modulation symbol.

[0192] That is, the waveform is generated for each modulation symbol, and the end of each modulation symbol is copied to the beginning of the modulation symbol to form the second part. For example, the last X samples in each OOK symbol are copied to the beginning of the OOK symbol to add the second part. If an OFDM symbol contains M OOK symbols, and M > 1, then there are M second parts in one OFDM symbol.

[0193] In addition, there is a special case where the transmitting device can directly send the modulation symbols without considering the addition of the second part. That is, when sending and receiving signals, the first part is sent directly without considering the setting of the second part.

[0194] Solution 2: The second part is determined based on the last modulation symbol in the OFDM symbol.

[0195] Solution 2 sets the second part per OFDM symbol. The second part is formed by copying the end of each OFDM symbol to the beginning of that OFDM symbol. For example, the end of the last modulation symbol in an OFDM symbol is copied to the beginning of the first modulation symbol in that OFDM symbol.

[0196] An OFDM symbol may include one modulation symbol or multiple modulation symbols.

[0197] If an OFDM symbol includes multiple modulation symbols (i.e., M > 1), the first modulation symbol and the last modulation symbol within an OFDM symbol may be different. Determining the second portion based on the last modulation symbol can result in undesirable high-low level jumps, negatively impacting the signal envelope characteristics and hindering signal reception and detection. For example, taking an OFDM symbol including four OOK symbols as an example, as shown in FIG14 , symbols #0 to #13 represent 14 OFDM symbols. The last X sampling points of the last OOK symbol within each OFDM symbol are copied before the first OOK symbol within that OFDM symbol. The second portion of symbols #6 and #7 has a different level than the first OOK symbol. This means that non-OOK symbols within symbols #6 and #7 experience high-low level jumps, which is detrimental to envelope detection and negatively impacts the reception performance of the first wireless device.

[0198] If an OFDM symbol contains only one modulation symbol (i.e., M = 1), the last X sampling points within the modulation symbol are copied to the beginning of the modulation symbol. This prevents high-low level transitions in non-OOK symbols and has minimal impact on the overall signal waveform. For example, as shown in FIG15 , the last X sampling points within each OFDM symbol are copied to the beginning of the OOK symbol to add a second portion. The waveform of the second portion before the OOK-On symbol is similar to the OOK-On waveform, and the waveform of the second portion before the OOK-Off symbol is similar to the OOK-Off waveform.

[0199] Solution 3: The second part is determined based on the first modulation symbol in the OFDM symbol.

[0200] As can be seen from the introduction to Solution 2, it's actually undesirable for the second part to have a significant level difference between the first and second modulation symbols. In other words, it's desirable for the waveform of the second part to be roughly the same as the first modulation symbol, minimizing its impact on the overall signal waveform. Therefore, it's possible to consider directly copying a portion of the first modulation symbol to the beginning of the first modulation symbol.

[0201] It can be understood that whether the starting part of the first modulation symbol is copied before the first modulation symbol, or the ending part of the first modulation symbol is copied before the first modulation symbol, the same beneficial effect can be achieved, that is, the impact of the second part on the overall waveform of the signal can be reduced, and no high and low level jumps of non-OOK symbols will be generated.

[0202] Taking an OFDM symbol including 4 OOK symbols as an example, that is, when M>1, as shown in Figure 16, the X sampling points at the end of the first OOK symbol in each OFDM symbol are copied to the beginning of the first OOK symbol in the OFDM symbol, or the X sampling points at the beginning of the first OOK symbol in each OFDM symbol are copied to the beginning of the first OOK symbol in each OFDM symbol. This does not cause high or low level jumps of non-OOK symbols, which is beneficial to ensuring the accuracy of envelope detection.

[0203] Solution 4: The second part is determined according to the first modulation symbol in the OFDM symbol, and the M modulation symbols in the OFDM symbol have two time domain lengths.

[0204] Solution 4 is mainly for the case where M>1, that is, solution 4 is more suitable for the case where one OFDM symbol is used to transmit multiple modulation symbols. If an OFDM symbol contains only one modulation symbol, solution 1, solution 2, or solution 3 is used to set the second part.

[0205] Although solution three can effectively avoid the high-low level jumps of non-OOK symbols and has little impact on the overall waveform of the signal, it is obvious that the addition of the second part changes the time domain length of the original high-level waveform and the time domain length of the low-level waveform. Referring to Figure 16, symbol #1 originally contained two OOK-On symbols and two OOK-Off symbols, and the time domain length of the high-level waveform was equal to the time domain length of the low-level waveform. However, after adding the second part before the first OOK-On symbol, the time domain length of the high-level waveform in symbol #1 is significantly longer than the time domain length of the low-level waveform. This is not conducive to the first wireless device's reception and detection of the first signal, nor is it conducive to the first wireless device performing time-frequency synchronization based on the received signal level jumps, such as being detrimental to clock calibration and / or fine-tuning.

[0206] To this end, Scheme 4 further designs the time domain length of the modulation symbol so that the sum of the time domain lengths of the second part and the first modulation symbol is as equal as possible to the time domain length of the second modulation symbol, thereby helping the first wireless device to accurately receive the first signal and facilitate the first wireless device to perform time-frequency synchronization based on the received signal level jump. Such a time domain length design can be expressed by the following equation (7). K0+K1=K2 (7)

[0207] Among them, K0 represents the time domain length of the second part within an OFDM symbol, K1 represents the time domain length of the first modulation symbol within an OFDM symbol (such as the time domain length of the first OOK symbol), and K2 represents the time domain length of the second modulation symbol within an OFDM symbol (such as the time domain length of any OOK symbol other than the first OOK symbol). In this application, the time domain length can be understood as the duration of the signal. Common time domain length units include μs (microseconds), ms (milliseconds), etc.

[0208] That is, the high-level duration corresponding to each OOK-On symbol (if the second part is attached before the OOK-On symbol, it means the sum of the second part and the high-level duration corresponding to the OOK-On symbol) is approximately equal to the low-level duration corresponding to each OOK-Off symbol (if the second part is attached before the OOK-Off symbol, it means the sum of the second part and the low-level duration corresponding to the OOK-Off symbol).

[0209] It should be noted that in Solution 4, the second part can be considered as a part independent of the M modulation symbols, or it can be considered as an additional part of the first modulation symbol, that is, the second part and the first modulation symbol are considered as a whole. If one OFDM symbol corresponds to 4 chips (code chips), it can be considered that the time domain length of the first chip is the sum of the time domain lengths of the second part and the first OOK symbol, and the remaining three chips correspond to the second OOK symbol to the fourth OOK symbol respectively. If the second part and the first modulation symbol are considered as a whole, the first wireless device does not need to distinguish between the second part and the first modulation symbol when receiving signals, detecting signals, and performing time-frequency synchronization. This can improve the simplicity and efficiency of reception, detection, synchronization, and other tasks.

[0210] It can be understood that the sum of the second part and the time domain length of M modulation symbols is the time domain length of one OFDM symbol. Therefore, the time domain length relationship of the modulation symbol can also be expressed by the following formula (8): K0+K1+K2*(M-1)=K (8)

[0211] Here, K represents the time domain length of an OFDM symbol, and this OFDM symbol includes the second part, the first modulation symbol, and M-1 second modulation symbols.

[0212] Therefore, it can be considered that the time domain length of the second part is related to at least one of the following: the time domain length of the first modulation symbol, the time domain length of the second modulation symbol, and the time domain length of one OFDM symbol.

[0213] As previously mentioned, setting the second portion based on the beginning or end of the first modulation symbol can be achieved by copying several time-domain sampling points at the beginning or end of the first modulation symbol to the beginning of the first modulation symbol. Therefore, the relationship between the second portion and the modulation symbol in the time domain can also be represented by time-domain sampling points.

[0214] It can be understood that the number of time domain sampling points is proportional to the time domain length. Assuming that the number of time domain sampling points corresponding to the first modulation symbol is S1 and the number of time domain sampling points corresponding to the second modulation symbol is S2, the following equations (9) and (10) can be obtained. K1 / K2=S1 / S2 (9) S1 / K1=S2 / K2 (10)

[0215] Assuming that the number of time domain sampling points corresponding to the second part is S0, referring to equations (7) to (8), we can further obtain the following equations (11) to (12): S0+S1=S2 (11) S0+S1+S2*(M-1)=S (12)

[0216] Here, S represents the number of time domain sampling points corresponding to an OFDM symbol, and this OFDM symbol includes the second part, the first modulation symbol, and M-1 second modulation symbols.

[0217] Therefore, it can be considered that the number of time domain sampling points corresponding to the second part is related to at least one of the following: the number of time domain sampling points corresponding to the first modulation symbol, the number of time domain sampling points corresponding to the second modulation symbol, and the number of time domain sampling points corresponding to an OFDM symbol.

[0218] The M modulation symbols are obtained by modulating M bits. During the signal generation and modulation stage, the M bits will be expanded into a sequence with a sequence length of N. For the sake of convenience, this sequence with a sequence length of N is called the first sequence. The first sequence includes M subsequences, and the M subsequences correspond one-to-one to the M bits, and the M subsequences also correspond one-to-one to the M modulation symbols. Since the time domain length and the number of time domain sampling points of the M modulation symbols are different, the time domain length of the M subsequences should also be different. The sequence length of the first subsequence and / or the sequence length of the second subsequence meet at least one of the following:

[0219] The sequence length of the first subsequence is less than the sequence length of the second subsequence;

[0220] The length of the first subsequence plus the lengths of the M-1 second subsequences equals the length of the first sequence.

[0221] The ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the number of time-domain sampling points corresponding to the first modulation symbol to the number of time-domain sampling points corresponding to the second modulation symbol;

[0222] The ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the second modulation symbol;

[0223] The ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the number of time-domain sampling points corresponding to the first modulation symbol to the number of time-domain sampling points corresponding to one OFDM symbol;

[0224] The ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of one OFDM symbol;

[0225] The ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the number of time-domain sampling points corresponding to the second modulation symbol to the number of time-domain sampling points corresponding to one OFDM symbol;

[0226] The ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the second modulation symbol to the time domain length of one OFDM symbol.

[0227] Specifically, the first subsequence can be obtained by extending the third sequence, and the length of the first subsequence is greater than or equal to the length of the third sequence; the second subsequence can be obtained by extending the fourth sequence, and the length of the second subsequence is greater than or equal to the length of the fourth sequence; and the length of the third sequence is equal to the length of the fourth sequence. In other words, the third and fourth sequences of the same length can be extended to obtain first and second subsequences of different lengths. Optionally, the sequence elements of the third sequence may be the same as or different from the sequence elements of the fourth sequence.

[0228] Exemplarily, the third sequence and the fourth sequence have the same sequence length, both 256. The third sequence is extended to a sequence with a sequence length of 404, and this sequence with a sequence length of 404 is the first subsequence. The fourth sequence is extended to a sequence with a sequence length of 548, and this sequence with a sequence length of 548 is the second subsequence. Optionally, the sequence elements of the third sequence and the fourth sequence are the same or different.

[0229] Assuming that the subsequence length corresponding to the first modulation symbol is N1, the subsequence length corresponding to the second modulation symbol is N2, the sequence length of the first sequence is N, and the subsequence length corresponding to the second sequence is N0, the following equations (13) to (21) can be obtained, where the values ​​of each parameter are all greater than 0. N1<K2 (13) N1+N2*(M-1)=N (14) N1 / N2=S1 / S2 (15) N1 / N2=K1 / K2 (16) N1 / N=K1 / K (17) N2 / N=K2 / K (18) N1 / N=S1 / S (19) N2 / N=S2 / S (20) N0+N1=N2 (21)

[0230] Each formula provided in this application can be transformed according to mathematical operation rules, and the resulting formula still falls within the scope of protection of this application. For example, formula (14) can be transformed into N1=N-N2*(M-1), or it can be transformed into N2=(N-N1) / (M-1).

[0231] In addition, the following possibilities may also exist: or or in, Indicates rounding up. Indicates rounding down.

[0232] The subsequence corresponding to the modulation symbol may be an all-ones sequence, an all-zeros sequence, or the dot product of an all-ones sequence or an all-zeros sequence with the OFDM sequence. Optionally, the dot product sequences corresponding to different subsequences may be the same or different. The OFDM sequence is used for at least one of the following: spectrum shaping, carrying data information, or carrying control information.

[0233] An OFDM symbol consists of four OOK symbols modulated by the bits "1001." The first bit "1" in "1001" is mapped into a subsequence A1 of length N1. Subsequence A1 can consist entirely of "1s" (i.e., an all-1 sequence), or it can consist entirely of "0s" (i.e., an all-0 sequence). Subsequence A1 can also be the dot product of an all-1 sequence and OFDM sequence B1, or the dot product of an all-0 sequence and OFDM sequence B1. The second bit "0" in "1001" is mapped into a subsequence A2 of length N2. Subsequence A2 can be an all-1 sequence or an all-0 sequence, or it can be the dot product of an all-1 sequence or an all-0 sequence and OFDM sequence B2. OFDM sequence B1 and OFDM sequence B2 may be identical or different. The differences may be reflected in at least one of the following aspects: different sequence lengths, different sequence elements (i.e., different values), and different information carried. The third and fourth bits in "1001" refer to the second bit and are not further described.

[0234] In some embodiments, the sequence length of the first subsequence is associated with the product of the sequence length of the first sequence and the first numerical value. The first numerical value is the quotient of the second numerical value and the number of time domain sampling points corresponding to M modulation symbols, the second numerical value is the difference between the third numerical value and the number of time domain sampling points corresponding to the second part, and the third numerical value is the difference between the number of time domain sampling points corresponding to one OFDM symbol and M. Optionally, the sequence length of the first subsequence is equal to the product of the sequence length of the first sequence and the first numerical value. Optionally, the sequence length of the first subsequence is equal to the product of the sequence length of the first sequence and the first numerical value, rounded up. Optionally, the sequence length of the first subsequence is equal to the product of the sequence length of the first sequence and the first numerical value, rounded down.

[0235] In some embodiments, the sequence length of the second subsequence is associated with the product of the sequence length of the first sequence and a fourth value. The fourth value is the quotient of the number of time domain sampling points corresponding to one OFDM symbol and the fifth value, and the fifth value is the product of the number of time domain sampling points corresponding to M modulation symbols and M. Optionally, the sequence length of the second subsequence is equal to the product of the sequence length of the first sequence and the fourth value. Optionally, the sequence length of the second subsequence is equal to the product of the sequence length of the first sequence and the fourth value, rounded up. Optionally, the sequence length of the second subsequence is equal to the product of the sequence length of the first sequence and the fourth value, rounded down.

[0236] Next, we will explain the association relationship mentioned in the previous two paragraphs from a mathematical perspective:

[0237] It can be understood that the proportion of the subsequence length corresponding to the second modulation symbol in the sequence length of the first sequence is equal to or approximately equal to the proportion of the number of time-domain sampling points corresponding to the second modulation symbol in the number of time-domain sampling points corresponding to the M modulation symbols. The case where the two are equal is shown in Equation (22).

[0238] Combining equations (11) to (12), we can obtain S2*M=S0+S1+S2*(M-1)=S. Equation (22) can also be transformed into equation (23).

[0239] Among them, the fourth value is or The fifth value is M*(S-S0) or M*[S1+S2(M-1)].

[0240] As mentioned above, and They do not have to be completely equal, but can be approximately equal, that is, approximately equal. Therefore, N2 can be The result of rounding up or down, or The result of rounding up or down.

[0241] Combining formula (23) with N1=N-N2*(M-1), we can also obtain formula (24).

[0242] Similarly, N1 can be The result of rounding up or down, or The result of rounding up or down.

[0243] It should be noted that the implementation of Scheme 4 does not require that N1 and N2 satisfy all of Equations (7) to (23). Instead, it supports the use of one or more of Equations (7) to (24) to design the time domain length / number of time domain sampling points / sequence length of the modulation symbol. Through this time domain length relationship, the sum of the time domain lengths of the first modulation symbol with the second part attached can be ensured to have no significant difference from the time domain length of the second modulation symbol, which facilitates signal reception by the first wireless device.

[0244] Figure 17 shows a schematic diagram of a communication method provided by an exemplary embodiment of the present application. Assume that the bits transmitted in an OFDM symbol are "1001", the bit "1" is expanded into a sequence of all "1", the bit "0" is expanded into a sequence of all "0", and the first bit "1" is mapped into a subsequence with a sequence length of N1, and the other three bits are mapped into subsequences with a sequence length of N2. After signal generation and modification, DFT / least square method, truncation of the sequence length of the first sequence from N to N' and modification, LP-WUS and legacy NR signal can be obtained. The SC in the figure represents subcarrier. After a unified IFFT and adding the second part, the first signal can be obtained. Each OFDM symbol used by the first signal satisfies one or more formulas in equations (7) to (24). For example, S0+S1=S2, K0+K1=K2, N0+N1=N2, and so on. Each second part is determined based on the first OOK symbol (i.e., OOK symbol 1) in the OFDM symbol to which it belongs, and can be the starting S0 time domain sampling points of the first OOK symbol or the last S0 time domain sampling points of the first OOK symbol. Optionally, referring to formula (6), the time domain length of the second part in symbol #0 and symbol #7 is slightly longer than the time domain length of the second part in other symbols. Specifically, taking an OFDM symbol time domain sampling point containing 144 CP points and 2048 data points (S0=144, S=2192), M=4, N=2048, N'=8*12=96 (8 PRBs are allocated for LP-WUS signals) as an example, according to Can be calculated but That is, "1001" is mapped into four subsequences of length 404, 548, 548, and 548, with a total length of 2048. After DFT transformation, frequency domain data of length N = 2048 is obtained. This is then truncated into a frequency domain sequence of length N' = 96, and subcarrier frequency domain coefficients are mapped. After IFFT, the first part of the time domain signal (with 2048 sampling points) can be obtained. According to scheme 4, the second part is determined to have a sampling point number of X = 144. In other implementations, N can also be equal to N'.

[0245] The second part of Scheme 4 is determined based on the first modulation symbol, which may be different from the technical specifications supported by existing wireless devices, and requires an equipment upgrade (software and / or hardware upgrade) for existing wireless devices. There are two implementation methods when sending the first signal and other NR / WIFI signals at the same time. Method 1: Perform frequency domain SC mapping on the signal of the entire BWP / bandwidth, and after IFFT, use Scheme 4 to generate the second part of the signal. Method 2: Generate the first signal and other NR / WIFI signals separately. When generating the first signal, use Scheme 4 to generate the second part corresponding to the first signal. When generating other signals, use the legacy method to generate the corresponding fourth part. Then, superimpose the first signal and other signals for transmission.

[0246] Solution 5: The second part is determined according to the last modulation symbol in the OFDM symbol, and the M modulation symbols in the OFDM symbol have two time domain lengths.

[0247] While both Schemes 3 and 4 guarantee envelope detection accuracy and minimally impact the signal waveform, and Scheme 4 further enhances the signal reception performance of the first wireless device, because the second portion is determined based on the first modulation symbol, it may differ from the technical specifications supported by existing wireless devices. This requires upgrading existing wireless devices (software and / or hardware). Therefore, Schemes 3 and 4 are not conducive to maximizing the reuse of existing devices. Therefore, Scheme 5, which offers greater forward compatibility, was designed.

[0248] In practice, as long as the sum of the time domain lengths of the second part and the first modulation symbol is substantially equal to the time domain length of the second modulation symbol, the first wireless device can perform decoding based on the energy difference within the lengths of two consecutive modulation symbols. For example, referring to FIG18 , using Manchester encoding as an example, each information bit is encoded into two bits, corresponding to an OKK-On waveform and an OKK-Off waveform. Based on the last OOK symbol in an OFDM symbol, after the second part is appended before the first OOK symbol, the second part and the first OOK symbol can be considered as a whole, considered a single chip. Each subsequent OOK symbol is considered a separate chip. Therefore, within symbol #0, the first chip includes the second part and the OOK-Off symbol, and the second chip includes the OKK-On symbol. Even though the addition of the second part results in an undesirable high-level waveform, the cumulative energy within the first chip is still less than the cumulative energy within the second chip, and the average energy within the first chip is also less than the average energy within the second chip. In other words, the energy 1 generated by the second part and the first OOK-Off waveform is less than the energy 2 generated by the OKK-On waveform. The first chip in symbol #1 includes the second part and the OKK-On symbol, while the second chip includes the OOK-Off symbol. Even though the addition of the second part results in an undesirable low-level waveform, the cumulative energy in the first chip is still greater than the cumulative energy in the second chip. The average energy in the first chip is also greater than the average energy in the second chip. In other words, the energy 3 generated by the second part and the first OKK-On waveform is greater than the energy 4 generated by the OOK-Off waveform. Therefore, the first wireless device can accurately distinguish the chips based on the energy difference, thereby correctly decoding and receiving the signal.

[0249] Similar to Scheme 4, Scheme 5 should also make the sum of the second part and the time domain length of the first modulation symbol as equal as possible to the time domain length of the second modulation symbol. Scheme 5 also supports the use of one or more formulas in Equations (7) to (24) to design the time domain length / number of time domain sampling points / sequence length of the modulation symbol. The main difference between Scheme 5 and Scheme 4 is that the second part in Scheme 5 is determined based on the last modulation symbol, which has better compatibility with existing wireless equipment, does not require large-scale equipment upgrades, and helps reduce communication costs.

[0250] Figure 19 shows a schematic diagram of a communication method provided by an exemplary embodiment of the present application. Assume that the bits transmitted in an OFDM symbol are "1001", the bit "1" is expanded into a sequence of all "1", the bit "0" is expanded into a sequence of all "0", and the first bit "1" is mapped into a subsequence with a sequence length of N1, and the other three bits are mapped into subsequences with a sequence length of N2. After signal generation and modification, DFT / least squares method, truncating the sequence length of the first sequence from N to N' and modifying it, LP-WUS and traditional NR signals can be obtained. The SC in the figure represents the subcarrier. After a unified IFFT and adding the second part, the first signal can be obtained. Each OFDM symbol used by the first signal satisfies one or more formulas in equations (7) to (24). For example, S0+S1=S2, K0+K1=K2, N0+N1=N2, and so on. Each second part is determined based on the last OOK symbol (i.e., OOK symbol 4) within the OFDM symbol to which it belongs, and can be a copy of the last S0 time domain sampling points of the last OOK symbol. When receiving the first signal, the first wireless device can make a decision based on the cumulative energy or average energy within two consecutive OOK symbols based on the time domain length of each symbol period = 2 OOK symbols. The design of scheme five can greatly reduce the impact of the second part on the waveform and reception performance. Even if the first wireless device has low complexity and does not have the ability to process the second part, it can still correctly receive the first signal. Optionally, referring to formula (6), the time domain length of the second part in symbol #0 and symbol #7 is slightly longer than the time domain length of the second part in other symbols.

[0251] The cumulative energy in Solution 5 can refer to the total energy accumulated by the signal over a period of time or within a frequency domain. The average energy can be determined by dividing the cumulative energy by the time domain length or the frequency domain bandwidth. In other words, the average energy represents the average energy of the signal over a period of time or within a frequency domain. For energy calculation methods, please refer to the relevant literature.

[0252] In summary, the signal received by the first wireless device may be appended with the second part using any one of the five solutions above. The signal sent by the second wireless device may also be appended with the second part using any one of the five solutions above.

[0253] In addition, consider a special case: when the A-IoT device / LP-WUR device acts as the receiver of the first signal, the setting of the second part helps the A-IoT device / LP-WUR device to accurately receive the first signal and improve the signal reception quality. However, when the A-IoT device / LP-WUR device transmits a signal, due to the low complexity of the A-IoT device / LP-WUR device, it is very likely that the addition of the second part is not supported. In other words, it cannot be ruled out that the A-IoT device / LP-WUR device does not have the ability or does not support the use of the above five solutions to add the second part. Then, when sending a signal, the A-IoT device / LP-WUR device can not add the second part. For example, the A-IoT device / LP-WUR device directly sends a signal with an OOK waveform that does not include the second part.

[0254] FIG20 shows a block diagram of a communication device according to an exemplary embodiment of the present application. The device may be implemented as the first wireless device described above, or may be implemented as a portion of the first wireless device described above. Optionally, the device may be a wireless communication device or wireless device that supports WLAN / Wi-Fi protocols (e.g., 802.11 protocols). Optionally, the device may be a wireless communication device or wireless device that supports 3GPP protocols. The device includes a receiving module 2010. Optionally, the device also includes a processing module 2030 and / or a sending module 2050.

[0255] Receiving module 2010 is used to receive a first signal, where the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0256] In some embodiments, the apparatus comprises a processing module 2030 for determining the first portion and the second portion.

[0257] In some embodiments, the processing module 2030 is configured to determine the energy of the first portion and the energy of the second portion.

[0258] In some embodiments, the processing module 2030 is used to detect the first signal and / or for energy harvesting.

[0259] In some embodiments, the apparatus includes a sending module 2050 for sending signals / data to another device (such as a second wireless device), such as sending at least one of the following: a data frame, a control frame, and a management frame.

[0260] In some embodiments, the energy used by the sending module 2050 is the energy collected by the processing module 2030 .

[0261] In some embodiments, the receiving module 2010 is used to perform step 1220.

[0262] The aforementioned content regarding "arranging the second part within the OFDM symbol" is also applicable to the communication device shown in Figure 20. In other words, the signal received by the communication device shown in Figure 20 can be added with the second part using any of the five schemes described above, which will not be repeated here.

[0263] In some embodiments, the apparatus includes at least one of the following: an A-IoT device, an AMP device, a passive IoT device, a zero-power device, a low-power device, an ultra-low-power device, and an LP-WUR device.

[0264] In summary, in the apparatus provided in the embodiments of the present application, the second portion can mitigate the transmission delay of the first portion, thereby preventing ISI. The second portion also helps ensure subcarrier orthogonality, thereby preventing ICI. Therefore, the configuration of the second portion can effectively combat multipath effects, ensure the transmission quality of the first signal, and improve communication efficiency within the communication system.

[0265] FIG21 shows a block diagram of a communication device according to an exemplary embodiment of the present application. The device may be implemented as the second wireless device described above, or may be implemented as a portion of the second wireless device described above. Optionally, the device may be a wireless communication device or wireless device that supports WLAN / Wi-Fi protocols (e.g., 802.11 protocols). Optionally, the device may be a wireless communication device or wireless device that supports 3GPP protocols. The device includes a transmitting module 2110. Optionally, the device also includes a processing module 2130 and / or a receiving module 2150.

[0266] The sending module 2110 is used to send a second signal, where the second signal includes the first signal, or the second signal includes a superimposed signal of the first signal and the OFDM signal; wherein the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit the first part and the second part, the first part includes M modulation symbols, and the second part is determined based on the first part; N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

[0267] In some embodiments, the apparatus comprises a processing module 2130 configured to generate at least one of the following signals: the first signal, the OFDM signal, and the second signal.

[0268] In some embodiments, the processing module 2130 is configured to generate the first portion and / or the second portion.

[0269] In some embodiments, the apparatus includes a receiving module 2150 configured to receive signals / data sent by another device (such as the first wireless device), such as receiving at least one of the following: a data frame, a control frame, and a management frame.

[0270] In some embodiments, the receiving module 2150 is configured to receive a backscattered signal from a first wireless device.

[0271] In some embodiments, the sending module 2110 is used to perform step 1320.

[0272] The aforementioned content regarding "arranging the second part within the OFDM symbol" is also applicable to the communication device shown in Figure 21. In other words, the signal transmitted by the communication device shown in Figure 21 can adopt any of the above five schemes to add the second part, which will not be repeated here.

[0273] In summary, in the apparatus provided in the embodiments of the present application, the second portion can mitigate the transmission delay of the first portion, thereby preventing ISI. The second portion also helps ensure subcarrier orthogonality, thereby preventing ICI. Therefore, the configuration of the second portion can effectively combat multipath effects, ensure the transmission quality of the first signal, and improve communication efficiency within the communication system.

[0274] It should be noted that the apparatus provided in the above embodiments is merely illustrated by the division of the above functional modules when implementing its functions. In actual applications, the above functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the communication device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments are based on the same concept.

[0275] Figure 22 shows a schematic diagram of the structure of a communication device 2200 provided by an exemplary embodiment of the present application, which includes at least one of the following: a receiver 2201, a transmitter 2202, a processor 2203, a memory 2204, and a bus (not shown). The communication device 2200 is configured to execute some or all of the steps performed by the first wireless device and / or the second wireless device described above. The receiver 2201 is configured to implement a receiving function, and the transmitter 2202 is configured to implement a transmitting function.

[0276] In some embodiments, the receiver 2201 may be used to implement the functions and steps of the above-mentioned receiving module 2010 and / or receiving module 2150 , and the transmitter 2202 may be used to implement the functions and steps of the above-mentioned sending module 2050 and / or sending module 2110 .

[0277] Optionally, receiver 2201 and transmitter 2202 can be implemented as a communication component, which can be a communication chip and can be referred to as a transceiver. Optionally, receiver 2201 and transmitter 2202 can be implemented as wireless communication components and / or wired communication components. Optionally, the wireless communication component includes a wireless communication chip and / or a radio frequency antenna. Optionally, the wired communication component includes a wired communication chip and / or a wired interface.

[0278] Processor 2203 includes one or more processing cores. Processor 2203 executes various functional applications and information processing by running software programs and modules. In some embodiments, processor 2203 can be used to implement the functions and steps of processing module 2030 and / or processing module 2130 described above. Memory 2204 can be used to store computer programs executed by processor 2203. Processor 2203 is used to execute the computer programs to implement the various steps in the above-described method embodiments.

[0279] In some embodiments, the memory 2204 may be connected to the processor 2203 as well as the receiver 2201 and the transmitter 2202 .

[0280] In addition, the memory 2204 can be implemented by any type of volatile or non-volatile storage device or a combination thereof. Volatile or non-volatile storage devices include but are not limited to: magnetic disks or optical disks, EEPROM (Electrically-Erasable Programmable Read Only Memory), EPROM (Erasable Programmable Read Only Memory), SRAM (Static Random Access Memory), ROM (Read-Only Memory), magnetic memory, flash memory, PROM (Programmable Read-Only Memory).

[0281] In some embodiments, the receiver 2201 receives signals / data independently, or the processor 2203 controls the receiver 2201 to receive signals / data, or the processor 2203 requests the receiver 2201 to receive signals / data, or the processor 2203 cooperates with the receiver 2201 to receive signals / data.

[0282] In some embodiments, the transmitter 2202 independently sends signals / data, or the processor 2203 controls the transmitter 2202 to send signals / data, or the processor 2203 requests the transmitter 2202 to send signals / data, or the processor 2203 cooperates with the transmitter 2202 to send signals / data.

[0283] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0284] Figure 23 shows a schematic diagram of the structure of a communication device 2300 provided by an exemplary embodiment of the present application, which includes at least one of the following: a receiver 2310, a transmitter 2320, a processor 2330, a memory 2340, and a bus (not shown). The communication device 2300 can be used to perform some or all of the steps performed by the first wireless device and / or the second wireless device described above. The receiver 2310 is used to implement a receiving function, and the transmitter 2320 is used to implement a transmitting function.

[0285] In some embodiments, receiver 2310 and transmitter 2320 may be implemented as a communication component, which may be a communication chip and may be referred to as a transceiver. For example, receiver 2310 and transmitter 2320 may be implemented as a wireless communication component. Optionally, the wireless communication component may include a wireless communication chip and / or a radio frequency antenna (not shown).

[0286] In some embodiments, receiver 2310 can be used to implement the functions and steps of the aforementioned receiving module 2010 and / or receiving module 2150. Optionally, receiver 2310 can be implemented as a first receiver 2313 and a second receiver 2315. Optionally, first receiver 2313 and second receiver 2315 are two independently operating receivers, that is, receiver 2310 includes two mutually independent first receivers 2313 and second receivers 2315. Optionally, receiver 2310 can be implemented as a combined receiver of first receiver 2313 and second receiver 2315.

[0287] In some embodiments, the first receiver 2313 is implemented as a WUR (Wake-up Receiver), which can also be called LP-WUR (Low Power WUR), ULP-WUR (Ultra Low Power WUR), low power receiver, ultra low power receiver, zero power receiver, auxiliary receiver, etc.

[0288] In some embodiments, the second receiver 2315 is implemented as a main receiver or a legacy receiver.

[0289] In some embodiments, transmitter 2320 can be used to implement the functions and steps of the aforementioned transmitting module 2050 and / or transmitting module 2110. Optionally, transmitter 2320 can be implemented as a first transmitter 2323 and / or a second transmitter 2325. Optionally, first transmitter 2323 and second transmitter 2325 are two independently operating transmitters, that is, transmitter 2320 includes two mutually independent first transmitters 2323 and second transmitters 2325. Optionally, transmitter 2320 is implemented as a combination of first transmitter 2323 and second transmitter 2325.

[0290] In some embodiments, the first transmitter 2323 is implemented as a backscatter transmitter and the second transmitter 2325 is implemented as a main transmitter.

[0291] In some embodiments, the processor 2330 and the receiver 2310 may be implemented as one module, or the processor 2330 may be implemented as a part of the receiver 2310 .

[0292] The processor 2330 includes one or more processing cores, and the processor 2330 executes various functional applications and information processing by running software programs and modules. In some embodiments, the processor 2330 can be used to implement the functions and steps of the processing module 2030 and / or the processing module 2130 described above.

[0293] The memory 2340 may be used to store a computer program executed by the processor 2330 , and the processor 2330 is used to execute the computer program to implement each step in the above method embodiment.

[0294] In some embodiments, the memory 2340 may be connected to the processor 2330, the receiver 2310, and the transmitter 2320. In addition, the memory 2340 may be implemented by any type of volatile or non-volatile storage device or a combination thereof, including but not limited to: magnetic or optical disks, EEPROM, EPROM, SRAM, ROM, magnetic memory, flash memory, and PROM.

[0295] In some embodiments, the receiver 2310 receives signals / data independently, or the processor 2330 controls the receiver 2310 to receive signals / data, or the processor 2330 requests the receiver 2310 to receive signals / data, or the processor 2330 cooperates with the receiver 2310 to receive signals / data.

[0296] In some embodiments, the transmitter 2320 independently sends signals / data, or the processor 2330 controls the transmitter 2320 to send signals / data, or the processor 2330 requests the transmitter 2320 to send signals / data, or the processor 2330 cooperates with the transmitter 2320 to send signals / data.

[0297] For details not described in detail in this embodiment, please refer to the above embodiments and will not be described in detail here.

[0298] In an exemplary embodiment of the present application, a chip is further provided, which includes a programmable logic circuit and / or program instructions. When the chip runs on a communication device, it is used to implement the communication methods provided by the above-mentioned various method embodiments.

[0299] In some embodiments, the chip includes a receiving module 2010. Optionally, the chip further includes a processing module 2030 and / or a sending module 2050. For related content, please refer to the above description and will not be repeated here.

[0300] In some embodiments, the chip includes a sending module 2110. Optionally, the chip further includes a processing module 2130 and / or a receiving module 2150. For related content, please refer to the above description and will not be repeated here.

[0301] In an exemplary embodiment of the present application, a computer-readable storage medium is further provided, in which at least one program is stored. The at least one program is loaded and executed by a processor to implement the communication methods provided by the above-mentioned various method embodiments.

[0302] In an exemplary embodiment of the present application, a computer program product is also provided. The computer program product includes computer instructions, the computer instructions are stored in a computer-readable storage medium, a processor obtains the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to implement the communication methods provided by the above-mentioned various method embodiments.

[0303] In an exemplary embodiment of the present application, a computer program is also provided. The computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. A processor obtains the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to implement the communication methods provided by the above-mentioned various method embodiments.

[0304] Those skilled in the art will understand that all or part of the steps to implement the above embodiments may be accomplished by hardware, or may be accomplished by a program instructing the relevant hardware, and the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a disk, or an optical disk, etc.

[0305] The above are only optional embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. A communication method, characterized in that: The method is performed by a first wireless device, and includes: A first signal is received, where the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

2. The method according to claim 1, characterized in that The second part is determined according to at least one of the following: a first modulation symbol, the first modulation symbol being a first modulation symbol of the M modulation symbols; a second modulation symbol, where the second modulation symbol is any modulation symbol among the M modulation symbols except the first modulation symbol; A third modulation symbol, where the third modulation symbol is the last modulation symbol among the M modulation symbols.

3. The method according to claim 2, characterized in that The second part is determined based on the starting X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the third modulation symbol; where X is an integer greater than or equal to 1.

4. The method according to claim 3, characterized in that The value of X is agreed upon by the communication protocol; or configured by the second wireless device; or associated with the transmission rate of the first signal; or associated with the subcarrier spacing in the frequency domain resources used by the first signal.

5. The method according to any one of claims 2 to 4, characterized in that: The time domain length of the second part is related to at least one of the following: the time domain length of the first modulation symbol, the time domain length of the second modulation symbol, and the time domain length of one OFDM symbol.

6. The method according to claim 5, characterized in that The time domain length of the second part satisfies at least one of the following: the sum of the time domain length of the second part and the time domain length of the first modulation symbol is equal to the time domain length of the second modulation symbol; the sum of the time domain length of the second part, the time domain length of the first modulation symbol and the time domain lengths of M-1 second modulation symbols is equal to the time domain length of the one OFDM symbol.

7. The method according to claim 5 or 6, characterized in that The time domain length of the second part satisfies at least one of the following formulas: K0+K1=K2; K0+K1+K2*(M-1)=K; Among them, K0 represents the time domain length of the second part, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, and K represents the time domain length of the one OFDM symbol.

8. The method according to any one of claims 2 to 7, characterized in that: The number of time domain sampling points corresponding to the second part is related to at least one of the following: the number of time domain sampling points corresponding to the first modulation symbol, the number of time domain sampling points corresponding to the second modulation symbol, and the number of time domain sampling points corresponding to an OFDM symbol.

9. The method according to claim 8, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following: The sum of the number of time domain sampling points corresponding to the second part and the number of time domain sampling points corresponding to the first modulation symbol is equal to the number of time domain sampling points corresponding to the second modulation symbol; The sum of the number of time domain sampling points corresponding to the second part, the number of time domain sampling points corresponding to the first modulation symbol, and the number of time domain sampling points corresponding to M-1 second modulation symbols is equal to the number of time domain sampling points corresponding to one OFDM symbol.

10. The method according to claim 8 or 9, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following formulas: S0+S1=S2; S0+S1+S2*(M-1)=S; Among them, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, and S represents the number of time domain sampling points corresponding to the one OFDM symbol.

11. The method according to any one of claims 5 to 10, characterized in that: The M modulation symbols are obtained by modulating M bits, and the first sequence corresponding to the M bits includes 1 first subsequence and M-1 second subsequences; wherein the first subsequence is a subsequence corresponding to the first bit, and the first bit is the first bit of the M bits; the second subsequence is a subsequence corresponding to the second bit, and the second bit is any bit of the M bits except the first bit.

12. The method according to claim 11, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following: the sequence length of the first subsequence is less than the sequence length of the second subsequence; the sum of the sequence length of the first subsequence and the sequence lengths of the M-1 second subsequences is equal to the sequence length of the first sequence; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the second modulation symbol; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the second modulation symbol; the sequence length of the first subsequence The ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the second modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the second modulation symbol to the time domain length of the one OFDM symbol.

13. The method according to claim 11 or 12, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following formulas: N1<K2; N1+N2*(M-1)=N; N1 / N2=S1 / S2; N1 / N2=K1 / K2; N1 / N=S1 / S; N1 / N=K1 / K; N2 / N=S2 / S; N2 / N=K2 / K; N2=(N-N1) / (M-1); Among them, N1 represents the sequence length of the first subsequence, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, S represents the number of time domain sampling points corresponding to the one OFDM symbol, and K represents the time domain length of the one OFDM symbol.

14. The method according to any one of claims 11 to 13, characterized in that: The sequence length of the first subsequence is associated with the product of the sequence length of the first sequence and a first value; wherein the first value is the quotient of the second value and the number of time domain sampling points corresponding to the M modulation symbols, the second value is the difference between the third value and the number of time domain sampling points corresponding to the second part, and the third value is the difference between the number of time domain sampling points corresponding to the one OFDM symbol and M.

15. The method according to any one of claims 11 to 14, characterized in that: The sequence length of the first subsequence satisfies at least one of the following formulas: Among them, N1 represents the sequence length of the first subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

16. The method according to any one of claims 11 to 15, characterized in that: The sequence length of the second subsequence is associated with the product of the sequence length of the first sequence and a fourth value; wherein the fourth value is the quotient of the number of time domain sampling points corresponding to the one OFDM symbol and a fifth value, and the fifth value is the product of the number of time domain sampling points corresponding to the M modulation symbols and M.

17. The method according to any one of claims 11 to 16, characterized in that: The sequence length of the second subsequence satisfies at least one of the following formulas: N2=N*S / [M*(S-S0)]; N2=N*S / [M*(S1+S2(M-1))]; Among them, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

18. The method according to any one of claims 11 to 17, characterized in that: Any subsequence included in the first sequence is a second sequence, or is a point product sequence of the second sequence and an OFDM sequence; wherein the bit values ​​of the second sequence are all equal.

19. The method according to claim 18, characterized in that The OFDM sequences corresponding to different subsequences included in the first sequence are the same or different.

20. The method according to claim 18 or 19, characterized in that The OFDM sequence is used for at least one of the following: spectrum shaping, carrying data information, and carrying control information.

21. The method according to any one of claims 1 to 20, characterized in that The second part includes a cyclic prefix CP, a guard interval GI, a guard period GP, or a guard time GT.

22. The method according to any one of claims 1 to 21, characterized in that In each OFDM symbol, the second part is located before the M modulation symbols.

23. The method according to any one of claims 1 to 22, characterized in that The first wireless device includes at least one of the following devices: a zero-power device, an ultra-low-power device, a low-power device, a passive Internet of Things device, an ambient energy Internet of Things A-IoT device, and a low-power wake-up receiver LP-WUR device.

24. A communication method, characterized in that: The method is performed by a second wireless device, and the method includes: Send a second signal, where the second signal includes the first signal, or the second signal includes a superimposed signal of the first signal and an OFDM signal; wherein the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

25. The method according to claim 24, characterized in that The second part is determined according to at least one of the following: a first modulation symbol, the first modulation symbol being a first modulation symbol of the M modulation symbols; a second modulation symbol, where the second modulation symbol is any modulation symbol among the M modulation symbols except the first modulation symbol; A third modulation symbol, where the third modulation symbol is the last modulation symbol among the M modulation symbols.

26. The method according to claim 25, characterized in that The second part is determined based on the starting X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the third modulation symbol; where X is an integer greater than or equal to 1.

27. The method according to claim 26, characterized in that The value of X is agreed upon by the communication protocol; or configured by the second wireless device; or associated with the transmission rate of the first signal; or associated with the subcarrier spacing in the frequency domain resources used by the first signal.

28. The method according to any one of claims 25 to 27, characterized in that The time domain length of the second part is related to at least one of the following: the time domain length of the first modulation symbol, the time domain length of the second modulation symbol, and the time domain length of one OFDM symbol.

29. The method according to claim 28, characterized in that The time domain length of the second part satisfies at least one of the following: the sum of the time domain length of the second part and the time domain length of the first modulation symbol is equal to the time domain length of the second modulation symbol; the sum of the time domain length of the second part, the time domain length of the first modulation symbol and the time domain lengths of M-1 second modulation symbols is equal to the time domain length of the one OFDM symbol.

30. The method according to claim 28 or 29, characterized in that The time domain length of the second part satisfies at least one of the following formulas: K0+K1=K2; K0+K1+K2*(M-1)=K; Among them, K0 represents the time domain length of the second part, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, and K represents the time domain length of the one OFDM symbol.

31. The method according to any one of claims 25 to 30, characterized in that The number of time domain sampling points corresponding to the second part is related to at least one of the following: the number of time domain sampling points corresponding to the first modulation symbol, the number of time domain sampling points corresponding to the second modulation symbol, and the number of time domain sampling points corresponding to an OFDM symbol.

32. The method according to claim 31, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following: The sum of the number of time domain sampling points corresponding to the second part and the number of time domain sampling points corresponding to the first modulation symbol is equal to the number of time domain sampling points corresponding to the second modulation symbol; The sum of the number of time domain sampling points corresponding to the second part, the number of time domain sampling points corresponding to the first modulation symbol, and the number of time domain sampling points corresponding to M-1 second modulation symbols is equal to the number of time domain sampling points corresponding to one OFDM symbol.

33. The method according to claim 31 or 32, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following formulas: S0+S1=S2; S0+S1+S2*(M-1)=S; Among them, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, and S represents the number of time domain sampling points corresponding to the one OFDM symbol.

34. The method according to any one of claims 28 to 33, characterized in that The M modulation symbols are obtained by modulating M bits, and the first sequence corresponding to the M bits includes 1 first subsequence and M-1 second subsequences; wherein the first subsequence is a subsequence corresponding to the first bit, and the first bit is the first bit of the M bits; the second subsequence is a subsequence corresponding to the second bit, and the second bit is any bit of the M bits except the first bit.

35. The method according to claim 34, wherein The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following: the sequence length of the first subsequence is less than the sequence length of the second subsequence; the sum of the sequence length of the first subsequence and the sequence lengths of the M-1 second subsequences is equal to the sequence length of the first sequence; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the second modulation symbol; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the second modulation symbol; the sequence length of the first subsequence The ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the second modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the second modulation symbol to the time domain length of the one OFDM symbol.

36. The method according to claim 34 or 35, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following formulas: N1<K2; N1+N2*(M-1)=N; N1 / N2=S1 / S2; N1 / N2=K1 / K2; N1 / N=S1 / S; N1 / N=K1 / K; N2 / N=S2 / S; N2 / N=K2 / K; N2=(N-N1) / (M-1); Among them, N1 represents the sequence length of the first subsequence, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, S represents the number of time domain sampling points corresponding to the one OFDM symbol, and K represents the time domain length of the one OFDM symbol.

37. The method according to any one of claims 34 to 36, characterized in that The sequence length of the first subsequence is associated with the product of the sequence length of the first sequence and a first value; wherein the first value is the quotient of the second value and the number of time domain sampling points corresponding to the M modulation symbols, the second value is the difference between the third value and the number of time domain sampling points corresponding to the second part, and the third value is the difference between the number of time domain sampling points corresponding to the one OFDM symbol and M.

38. The method according to any one of claims 34 to 37, characterized in that The sequence length of the first subsequence satisfies at least one of the following formulas: Among them, N1 represents the sequence length of the first subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

39. The method according to any one of claims 34 to 38, characterized in that The sequence length of the second subsequence is associated with the product of the sequence length of the first sequence and a fourth value; wherein the fourth value is the quotient of the number of time domain sampling points corresponding to the one OFDM symbol and a fifth value, and the fifth value is the product of the number of time domain sampling points corresponding to the M modulation symbols and M.

40. The method according to any one of claims 34 to 39, characterized in that The sequence length of the second subsequence satisfies at least one of the following formulas: N2=N*S / [M*(S-S0)]; N2=N*S / [M*(S1+S2(M-1))]; Among them, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

41. The method according to any one of claims 34 to 40, characterized in that Any subsequence included in the first sequence is a second sequence, or is a point product sequence of the second sequence and an OFDM sequence; wherein the bit values ​​of the second sequence are all equal.

42. The method according to claim 41, wherein The OFDM sequences corresponding to different subsequences included in the first sequence are the same or different.

43. The method according to claim 41 or 42, characterized in that The OFDM sequence is used for at least one of the following: spectrum shaping, carrying data information, and carrying control information.

44. The method according to any one of claims 24 to 43, characterized in that The second part includes a cyclic prefix CP, a guard interval GI, a guard period GP, or a guard time GT.

45. The method according to any one of claims 24 to 44, characterized in that In each OFDM symbol, the second part is located before the M modulation symbols.

46. ​​The method according to any one of claims 24 to 45, characterized in that The time domain resources used by the OFDM signal include Y OFDM symbols, each of the Y OFDM symbols is used to transmit the third part and the fourth part, and the third part is determined according to the end part of the fourth part; wherein Y is an integer greater than or equal to 1.

47. A communication device, characterized in that The device comprises: A receiving module is used to receive a first signal, where the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; wherein N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

48. The device according to claim 47, characterized in that The second part is determined according to at least one of the following: a first modulation symbol, the first modulation symbol being a first modulation symbol of the M modulation symbols; a second modulation symbol, where the second modulation symbol is any modulation symbol among the M modulation symbols except the first modulation symbol; A third modulation symbol, where the third modulation symbol is the last modulation symbol among the M modulation symbols.

49. The device according to claim 48, characterized in that The second part is determined based on the starting X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the third modulation symbol; where X is an integer greater than or equal to 1.

50. The device according to claim 49, characterized in that The value of X is agreed upon by the communication protocol; or configured by the second wireless device; or associated with the transmission rate of the first signal; or associated with the subcarrier spacing in the frequency domain resources used by the first signal.

51. The device according to any one of claims 48 to 50, characterized in that The time domain length of the second part is related to at least one of the following: the time domain length of the first modulation symbol, the time domain length of the second modulation symbol, and the time domain length of one OFDM symbol.

52. The device according to claim 51, characterized in that The time domain length of the second part satisfies at least one of the following: The sum of the time domain length of the second part and the time domain length of the first modulation symbol is equal to the time domain length of the second modulation symbol; The sum of the time domain length of the second part, the time domain length of the first modulation symbol and the time domain lengths of M-1 second modulation symbols is equal to the time domain length of the one OFDM symbol.

53. The device according to claim 51 or 52, characterized in that The time domain length of the second part satisfies at least one of the following formulas: K0+K1=K2; K0+K1+K2*(M-1)=K; Among them, K0 represents the time domain length of the second part, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, and K represents the time domain length of the one OFDM symbol.

54. The device according to any one of claims 48 to 53, characterized in that The number of time domain sampling points corresponding to the second part is related to at least one of the following: the number of time domain sampling points corresponding to the first modulation symbol, the number of time domain sampling points corresponding to the second modulation symbol, and the number of time domain sampling points corresponding to an OFDM symbol.

55. The device according to claim 54, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following: The sum of the number of time domain sampling points corresponding to the second part and the number of time domain sampling points corresponding to the first modulation symbol is equal to the number of time domain sampling points corresponding to the second modulation symbol; The sum of the number of time domain sampling points corresponding to the second part, the number of time domain sampling points corresponding to the first modulation symbol, and the number of time domain sampling points corresponding to M-1 second modulation symbols is equal to the number of time domain sampling points corresponding to one OFDM symbol.

56. The device according to claim 54 or 55, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following formulas: S0+S1=S2; S0+S1+S2*(M-1)=S; Among them, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, and S represents the number of time domain sampling points corresponding to the one OFDM symbol.

57. The device according to any one of claims 51 to 56, characterized in that The M modulation symbols are obtained by modulating M bits, and the first sequence corresponding to the M bits includes 1 first subsequence and M-1 second subsequences; wherein the first subsequence is a subsequence corresponding to the first bit, and the first bit is the first bit of the M bits; the second subsequence is a subsequence corresponding to the second bit, and the second bit is any bit of the M bits except the first bit.

58. The device according to claim 57, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following: the sequence length of the first subsequence is less than the sequence length of the second subsequence; the sum of the sequence length of the first subsequence and the sequence lengths of the M-1 second subsequences is equal to the sequence length of the first sequence; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the second modulation symbol; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the second modulation symbol; the sequence length of the first subsequence The ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the second modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the second modulation symbol to the time domain length of the one OFDM symbol.

59. The device according to claim 57 or 58, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following formulas: N1<K2; N1+N2*(M-1)=N; N1 / N2=S1 / S2; N1 / N2=K1 / K2; N1 / N=S1 / S; N1 / N=K1 / K; N2 / N=S2 / S; N2 / N=K2 / K; N2=(N-N1) / (M-1); Among them, N1 represents the sequence length of the first subsequence, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, S represents the number of time domain sampling points corresponding to the one OFDM symbol, and K represents the time domain length of the one OFDM symbol.

60. The device according to any one of claims 57 to 59, characterized in that The sequence length of the first subsequence is associated with the product of the sequence length of the first sequence and a first value; wherein the first value is the quotient of the second value and the number of time domain sampling points corresponding to the M modulation symbols, the second value is the difference between the third value and the number of time domain sampling points corresponding to the second part, and the third value is the difference between the number of time domain sampling points corresponding to the one OFDM symbol and M.

61. The device according to any one of claims 57 to 60, characterized in that The sequence length of the first subsequence satisfies at least one of the following formulas: Among them, N1 represents the sequence length of the first subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

62. The device according to any one of claims 57 to 61, characterized in that The sequence length of the second subsequence is associated with the product of the sequence length of the first sequence and a fourth value; wherein the fourth value is the quotient of the number of time domain sampling points corresponding to the one OFDM symbol and a fifth value, and the fifth value is the product of the number of time domain sampling points corresponding to the M modulation symbols and M.

63. The device according to any one of claims 57 to 62, characterized in that The sequence length of the second subsequence satisfies at least one of the following formulas: N2=N*S / [M*(S-S0)]; N2=N*S / [M*(S1+S2(M-1))]; Among them, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

64. The device according to any one of claims 57 to 63, characterized in that Any subsequence included in the first sequence is a second sequence, or is a point product sequence of the second sequence and an OFDM sequence; wherein the bit values ​​of the second sequence are all equal.

65. The device according to claim 64, characterized in that The OFDM sequences corresponding to different subsequences included in the first sequence are the same or different.

66. The device according to claim 64 or 65, characterized in that The OFDM sequence is used for at least one of the following: spectrum shaping, carrying data information, and carrying control information.

67. The device according to any one of claims 47 to 66, characterized in that The second part includes a cyclic prefix CP, a guard interval GI, a guard period GP, or a guard time GT.

68. The device according to any one of claims 47 to 67, characterized in that In each OFDM symbol, the second part is located before the M modulation symbols.

69. The device according to any one of claims 47 to 68, characterized in that The device includes at least one of the following devices: zero-power consumption device, ultra-low-power consumption device, low-power consumption device, passive Internet of Things device, ambient energy Internet of Things A-IoT device, and low-power wake-up receiver LP-WUR device.

70. A communication device, characterized in that The device comprises: A sending module, used to send a second signal, where the second signal includes the first signal, or the second signal includes a superimposed signal of the first signal and the OFDM signal; wherein the time domain resources used by the first signal include N OFDM symbols, each of the N OFDM symbols is used to transmit a first part and a second part, the first part includes M modulation symbols, and the second part is determined based on the first part; N is an integer greater than or equal to 1, and M is an integer greater than or equal to 1.

71. The device according to claim 70, characterized in that The second part is determined according to at least one of the following: a first modulation symbol, the first modulation symbol being a first modulation symbol of the M modulation symbols; a second modulation symbol, where the second modulation symbol is any modulation symbol among the M modulation symbols except the first modulation symbol; A third modulation symbol, where the third modulation symbol is the last modulation symbol among the M modulation symbols.

72. The device according to claim 71, characterized in that The second part is determined based on the starting X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the first modulation symbol; or, the second part is determined based on the last X time domain sampling points in the third modulation symbol; where X is an integer greater than or equal to 1.

73. The device according to claim 72, characterized in that The value of X is agreed upon by the communication protocol; or configured by the second wireless device; or associated with the transmission rate of the first signal; or associated with the subcarrier spacing in the frequency domain resources used by the first signal.

74. The device according to any one of claims 71 to 73, characterized in that The time domain length of the second part is related to at least one of the following: the time domain length of the first modulation symbol, the time domain length of the second modulation symbol, and the time domain length of one OFDM symbol.

75. The device according to claim 74, characterized in that The time domain length of the second part satisfies at least one of the following: The sum of the time domain length of the second part and the time domain length of the first modulation symbol is equal to the time domain length of the second modulation symbol; The sum of the time domain length of the second part, the time domain length of the first modulation symbol and the time domain lengths of M-1 second modulation symbols is equal to the time domain length of the one OFDM symbol.

76. The device according to claim 74 or 75, characterized in that The time domain length of the second part satisfies at least one of the following formulas: K0+K1=K2; K0+K1+K2*(M-1)=K; Among them, K0 represents the time domain length of the second part, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, and K represents the time domain length of the one OFDM symbol.

77. The device according to any one of claims 71 to 76, characterized in that The number of time domain sampling points corresponding to the second part is related to at least one of the following: the number of time domain sampling points corresponding to the first modulation symbol, the number of time domain sampling points corresponding to the second modulation symbol, and the number of time domain sampling points corresponding to an OFDM symbol.

78. The device according to claim 77, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following: The sum of the number of time domain sampling points corresponding to the second part and the number of time domain sampling points corresponding to the first modulation symbol is equal to the number of time domain sampling points corresponding to the second modulation symbol; The sum of the number of time domain sampling points corresponding to the second part, the number of time domain sampling points corresponding to the first modulation symbol, and the number of time domain sampling points corresponding to M-1 second modulation symbols is equal to the number of time domain sampling points corresponding to one OFDM symbol.

79. The device according to claim 77 or 78, characterized in that The number of time domain sampling points corresponding to the second part satisfies at least one of the following formulas: S0+S1=S2; S0+S1+S2*(M-1)=S; Among them, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, and S represents the number of time domain sampling points corresponding to the one OFDM symbol.

80. The device according to any one of claims 74 to 79, characterized in that The M modulation symbols are obtained by modulating M bits, and the first sequence corresponding to the M bits includes 1 first subsequence and M-1 second subsequences; wherein the first subsequence is a subsequence corresponding to the first bit, and the first bit is the first bit of the M bits; the second subsequence is a subsequence corresponding to the second bit, and the second bit is any bit of the M bits except the first bit.

81. The device according to claim 80, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following: the sequence length of the first subsequence is less than the sequence length of the second subsequence; the sum of the sequence length of the first subsequence and the sequence lengths of the M-1 second subsequences is equal to the sequence length of the first sequence; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the second modulation symbol; the ratio of the sequence length of the first subsequence to the sequence length of the second subsequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the second modulation symbol; the sequence length of the first subsequence The ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the first modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the first subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the first modulation symbol to the time domain length of the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the number of time domain sampling points corresponding to the second modulation symbol to the number of time domain sampling points corresponding to the one OFDM symbol; the ratio of the sequence length of the second subsequence to the sequence length of the first sequence is equal to the ratio of the time domain length of the second modulation symbol to the time domain length of the one OFDM symbol.

82. The device according to claim 80 or 81, characterized in that The sequence length of the first subsequence and / or the sequence length of the second subsequence satisfies at least one of the following formulas: N1<K2; N1+N2*(M-1)=N; N1 / N2=S1 / S2; N1 / N2=K1 / K2; N1 / N=S1 / S; N1 / N=K1 / K; N2 / N=S2 / S; N2 / N=K2 / K; N2=(N-N1) / (M-1); Among them, N1 represents the sequence length of the first subsequence, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, S2 represents the number of time domain sampling points corresponding to the second modulation symbol, K1 represents the time domain length of the first modulation symbol, K2 represents the time domain length of the second modulation symbol, S represents the number of time domain sampling points corresponding to the one OFDM symbol, and K represents the time domain length of the one OFDM symbol.

83. The device according to any one of claims 80 to 82, characterized in that The sequence length of the first subsequence is associated with the product of the sequence length of the first sequence and a first value; wherein the first value is the quotient of the second value and the number of time domain sampling points corresponding to the M modulation symbols, the second value is the difference between the third value and the number of time domain sampling points corresponding to the second part, and the third value is the difference between the number of time domain sampling points corresponding to the one OFDM symbol and M.

84. The device according to any one of claims 80 to 83, characterized in that The sequence length of the first subsequence satisfies at least one of the following formulas: Among them, N1 represents the sequence length of the first subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

85. The device according to any one of claims 80 to 84, characterized in that The sequence length of the second subsequence is associated with the product of the sequence length of the first sequence and a fourth value; wherein the fourth value is the quotient of the number of time domain sampling points corresponding to the one OFDM symbol and a fifth value, and the fifth value is the product of the number of time domain sampling points corresponding to the M modulation symbols and M.

86. The device according to any one of claims 80 to 85, characterized in that The sequence length of the second subsequence satisfies at least one of the following formulas: N2=N*S / [M*(S-S0)]; N2=N*S / [M*(S1+S2(M-1))]; Among them, N2 represents the sequence length of the second subsequence, N represents the sequence length of the first sequence, S represents the number of time domain sampling points corresponding to the one OFDM symbol, S0 represents the number of time domain sampling points corresponding to the second part, S1 represents the number of time domain sampling points corresponding to the first modulation symbol, and S2 represents the number of time domain sampling points corresponding to the second modulation symbol.

87. The device according to any one of claims 80 to 86, characterized in that Any subsequence included in the first sequence is a second sequence, or is a point product sequence of the second sequence and an OFDM sequence; wherein the bit values ​​of the second sequence are all equal.

88. The device according to claim 87, characterized in that The OFDM sequences corresponding to different subsequences included in the first sequence are the same or different.

89. The device according to claim 87 or 88, characterized in that The OFDM sequence is used for at least one of the following: spectrum shaping, carrying data information, and carrying control information.

90. The device according to any one of claims 70 to 89, characterized in that The second part includes a cyclic prefix CP, a guard interval GI, a guard period GP, or a guard time GT.

91. The device according to any one of claims 70 to 90, characterized in that In each OFDM symbol, the second part is located before the M modulation symbols.

92. The device according to any one of claims 70 to 91, characterized in that The time domain resources used by the OFDM signal include Y OFDM symbols, each of the Y OFDM symbols is used to transmit the third part and the fourth part, and the third part is determined according to the end part of the fourth part; wherein Y is an integer greater than or equal to 1.

93. A communication device, characterized in that The communication device includes: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to load and execute the executable instructions to implement the communication method according to any one of claims 1 to 23, or the communication method according to any one of claims 24 to 46.

94. A communication device, characterized in that The communication device includes: a receiver; the communication device is configured to execute the communication method according to any one of claims 1 to 23, or the communication method according to any one of claims 24 to 46.

95. A computer-readable storage medium, characterized in that The computer-readable storage medium stores at least one program, and the at least one program is loaded and executed by the processor to implement the communication method according to any one of claims 1 to 23, or the communication method according to any one of claims 24 to 46.

96. A computer program product or a computer program, characterized in that The computer program product or the computer program includes computer instructions, which are stored in a computer-readable storage medium. The processor obtains the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions to implement the communication method according to any one of claims 1 to 23, or the communication method according to any one of claims 24 to 46.

97. A chip, characterized in that The chip includes a programmable logic circuit and / or at least one program, and the chip is used to implement the communication method as described in any one of claims 1 to 23, or the communication method as described in any one of claims 24 to 46 based on the programmable logic circuit and / or the at least one program.

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