PPDU transmission method and device in Wi-Fi system, equipment and medium

Abstract

The invention discloses a PPDU transmission method and device in a Wi-Fi system, equipment and a medium, and relates to the field of communication. The method comprises the following steps: sending a PPDU in a transmission bandwidth, wherein the PPDU comprises a field which is copied and transmitted by taking a first bandwidth as a unit; wherein the field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as an application unit, and the second phase rotation sequence is a phase rotation sequence with the second bandwidth as an application unit. The second phase rotation sequence is a phase rotation sequence taking a second bandwidth as an application unit, the second bandwidth is a power multiple of two of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth. Therefore, the PPDU has better PAPR when being sent in the transmission bandwidth, so that the transmission efficiency and the stability of the Wi-Fi system are improved.

Description

PPDU transmission method, device, equipment and medium in Wi-Fi system Technical Field

[0001] The present application relates to the field of communications, and in particular to a PPDU transmission method, apparatus, device, and medium in a Wi-Fi system. Background Art

[0002] The maximum channel bandwidth specified for Wireless Fidelity (Wi-Fi) networks is 320 MHz. However, there is no definitive solution for wireless transmission in the future with potential next-generation Wi-Fi communication bandwidths, such as 480 MHz and 640 MHz.

[0003] Summary of the Invention

[0004] The present invention provides a method, apparatus, device, and medium for transmitting a physical layer protocol data unit (PPDU) in a Wi-Fi system. The technical solution is as follows:

[0005] According to one aspect of the present application, a PPDU transmission method in a Wi-Fi system is provided, the method comprising:

[0006] Sending a PPDU in a transmission bandwidth, the PPDU including a field that is replicated and transmitted in units of a first bandwidth;

[0007] The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0008] According to one aspect of the present application, a PPDU transmission method in a Wi-Fi system is provided, the method comprising:

[0009] receiving a PPDU in a transmission bandwidth, the PPDU including a field replicated for transmission in units of a first bandwidth;

[0010] The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0011] According to one aspect of the present application, a PPDU transmission device in a Wi-Fi system is provided, the device comprising:

[0012] a sending module, configured to send a PPDU in a transmission bandwidth, wherein the PPDU includes a field that is replicated and transmitted in units of a first bandwidth;

[0013] The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0014] According to one aspect of the present application, a PPDU transmission device in a Wi-Fi system is provided, the device comprising:

[0015] a receiving module configured to receive a PPDU in a transmission bandwidth, wherein the PPDU includes a field that is replicated and transmitted in units of a first bandwidth;

[0016] The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0017] According to one aspect of the present application, a wireless communication device is provided, comprising: a processor; a transceiver connected to the processor; and a memory for storing executable instructions of the processor. The processor is configured to load and execute the executable instructions to implement the PPDU transmission method in a Wi-Fi system as described in the above aspect.

[0018] According to one aspect of the present application, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores executable instructions, and the executable instructions are loaded and executed by a processor to implement the PPDU transmission method in a Wi-Fi system as described in the above aspect.

[0019] According to one aspect of the present application, a computer program product is provided. The computer program product includes computer instructions. The computer instructions are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device implements the PPDU transmission method in a Wi-Fi system as described in the above aspects.

[0020] According to one aspect of the present application, a chip is provided. The chip includes a programmable logic circuit and / or program instructions. When the chip is running, it is used to implement the PPDU transmission method in the Wi-Fi system as described in the above aspect.

[0021] According to one aspect of the present application, a computer program is provided. The computer program includes computer instructions. A processor of a computer device executes the computer instructions, so that the computer device performs the PPDU transmission method in a Wi-Fi system as described in the above aspect.

[0022] The technical solutions provided by the embodiments of the present application include at least the following beneficial effects:

[0023] By obtaining a target phase rotation sequence based on the first phase rotation sequence and the second phase rotation sequence, and generating fields in the PPDU based on the target phase rotation sequence, the PPDU can have a better PAPR when sent within the transmission bandwidth, thereby improving the transmission efficiency and stability of the Wi-Fi system. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] 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.

[0025] FIG1 shows a schematic diagram of a PPDU format in the related art;

[0026] FIG2 shows a schematic diagram of a PPDU format in the related art;

[0027] FIG3 shows a schematic diagram of a PPDU format in the related art;

[0028] FIG4 shows a schematic diagram of a Wi-Fi system provided by some exemplary embodiments of the present application;

[0029] FIG5 is a schematic diagram showing a flow chart of a PPDU transmission method in a Wi-Fi system provided in some exemplary embodiments of the present application;

[0030] FIG6 is a schematic flow chart showing a PPDU transmission method in a Wi-Fi system provided in some exemplary embodiments of the present application;

[0031] FIG7 is a schematic diagram showing a punching method provided by some exemplary embodiments of the present application;

[0032] FIG8 shows a schematic diagram of a phase rotation provided by some exemplary embodiments of the present application;

[0033] FIG9 shows a schematic diagram of a phase rotation provided by some exemplary embodiments of the present application;

[0034] FIG10 is a schematic diagram showing a puncturing method in a 240 MHz bandwidth provided by some exemplary embodiments of the present application;

[0035] FIG11 shows a structural block diagram of a PPDU transmission device in a Wi-Fi system provided in some exemplary embodiments of the present application;

[0036] FIG12 shows a schematic structural diagram of a wireless communication device provided by some exemplary embodiments of the present application. DETAILED DESCRIPTION

[0037] 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.

[0038] The terms used in this disclosure are for the purpose of describing specific embodiments only and are not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," "the," and "the" are intended to include the plural forms as well, 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.

[0039] It should be understood that although the terms first, second, third, etc. may be used in this disclosure to describe various information, such 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 disclosure, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Depending on the context, the word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining."

[0040] First, the relevant technologies involved in the embodiments of this application are introduced:

[0041] (1) Non-High-throughput (non-HT) Duplicate Transmission

[0042] During non-HT duplicate transmission, only the non-HT Short Training Field / Legacy Short Training Field (L-STF), non-HT Long Training Field / Legacy Long Training Field (L-LTF), non-HT Signal Field / Legacy Signal Field (L-SIG), and data fields are transmitted. The format of the non-HT duplicate physical layer protocol data unit (PPDU) is shown in Figure 1. Among them, the PSDU field represents the Physical Service Data Unit (PSDU); the tail bits are Tail Bits, if present (If Present), as shown in Figure 1; the pad bits are Pad Bits; the scrambler initialization is Scrambler Initialization, including fields B0 to B6, all set to 0 during the initialization phase (All set to 0); the reserved service bits are Reserved Service Bits, including fields B7 to B15, all of which are reserved fields.

[0043] Non-HT duplicate transmissions are used to transmit to non-HT stations (STAs), HT STAs, very high throughput (VHT) STAs, high-efficiency (HE) STAs, and extremely high throughput (EHT) STAs that may be present in a portion of a 40 MHz, 80 MHz, 160 MHz, or 320 MHz channel. Some control frames are transmitted as non-HT duplicate transmissions, such as Request-to-Send (RTS), Clear-to-Send (CTS), or Null Data Physical Layer Protocol Data Unit Announcement (NDPA). When performing non-HT duplicate transmission, the L-STF and L-LTF fields are transmitted in the same manner as EHT; the L-SIG field is transmitted in the same manner as EHT, except that: (1) the rate and length fields are different, and (2) the subcarriers indexed at ±27 and ±28 are not modulated (i.e., no energy); the data field is coded and modulated in units of 20 MHz bandwidth and then replicated in units of every 20 MHz across the entire bandwidth. In the case of a non-punctured transmission channel, a corresponding phase rotation is applied to the replicated 20 MHz to reduce the peak-to-average power ratio (PAPR); in the case of a punctured transmission channel, a punctured non-HT duplicate PPDU is transmitted.

[0044] (2)UHR PPDU

[0045] Considering the possible subsequent development of next-generation Wi-Fi communications, the next-generation Wi-Fi communications can be any new-generation Wi-Fi communications after Wi-Fi 7 based on the IEEE 802.11be specification, such as Ultra-High Reliability (UHR). There are two possible UHR PPDU forms: UHR Multi-User (MU) PPDU and UHR Trigger-Based (TB) PPDU.

[0046] 1.UHR MU PPDU

[0047] The format of the UHR MU PPDU is shown in Figure 2 and is used for transmission to one or more users. The L-STF field is primarily used for signal detection, automatic gain control, time synchronization, and coarse frequency offset estimation; the L-LTF field is primarily used for channel estimation and further frequency offset estimation; the L-SIG field is used to convey rate and length information; the Repeated Non-High Throughput Signal Field / Repeated Legacy Signal Field (RL-SIG) is a repetition of the L-SIG; the U-SIG and UHR-SIG fields carry information for decoding the PPDU; the UHR-STF field is used to improve automatic gain control estimation in Multiple-Input Multiple-Output (MIMO) transmission; the UHR-LTF is used for MIMO channel estimation from the constellation mapping output to the receive link; the Data field transmits information; and the PE field is the Packet Extension. In the UHR MU PPDU, the L-STF, L-LTF, L-SIG, RL-SIG, U-SIG, and UHR-SIG are referred to as pre-UHR modulation fields; the UHR-STF, UHR-LTF, Data, and PE are referred to as UHR modulation fields.

[0048] 2.UHR TB PPDU

[0049] Figure 3 shows the format of the UHR TB PPDU, which is used to transmit a response trigger frame from an access point (AP). In a UHR TB PPDU, the L-STF, L-LTF, L-SIG, and U-SIG are called the pre-UHR modulation field; the UHR-STF, UHR-LTF, Data, and PE are called the UHR modulation field. The duration of the UHR-STF field in a UHR TB PPDU is twice that of the UHR-STF field in a UHR MU PPDU.

[0050] (3) Phase Rotation in Related Art

[0051] When the bandwidth of the PPDU is greater than 20MHz, the pre-EHT modulation field (L-STF, L-LTF, L-SIG, U-SIG and UHR-SIG fields) and the non-HT duplicate transmission are replicated in units of 20MHz, which makes the pre-EHT modulation field and the non-HT duplicate transmission have a certain periodicity, which will increase the PAPR of the PPDU, thereby causing nonlinear distortion of the signal, resulting in obvious spectrum spread interference and in-band signal distortion, and seriously degrading the performance of the entire wireless communication system. In the related art, phase rotation is applied to the subcarriers in the pre-EHT modulation field and the non-HT duplicate transmission to reduce the PAPR, that is, the subcarriers in the pre-EHT modulation field and the non-HT duplicate transmission are multiplied by the phase rotation coefficient Y. k,BW , where k represents the subcarrier index, and BW represents the bandwidth (Band Width) corresponding to the phase rotation coefficient γ.

[0052] The phase rotation coefficient, or phase rotation value, represents the phase rotation of the signal and typically takes values ​​of 1, -1, j, or -j. A phase rotation value of 1 indicates a phase rotation of 0 degrees; a phase rotation value of -1 indicates a phase rotation of 180 degrees; a phase rotation value of j indicates a phase rotation of 90 degrees; and a phase rotation value of -j indicates a phase rotation of 270 degrees.

[0053] For example, when transmitting a 20MHz EHT PPDU, the subcarrier index value belongs to the closed interval of -32 to 31, that is, k∈[-32,31]. k,20 =1.

[0054] For example, when transmitting a 40MHz EHT PPDU, the subcarrier index value belongs to the closed interval of -64 to 63, that is, k∈[-64,63]. Correspondingly,

[0055]

[0056] For example, when transmitting an 80MHz EHT PPDU, the subcarrier index value belongs to the closed interval of -128 to 127, that is, k∈[-128,127]. Correspondingly,

[0057]

[0058] For example, when transmitting a 160MHz EHT PPDU, the subcarrier index value belongs to the closed interval of -256 to 255, that is, k∈[-256,255]. Correspondingly,

[0059]

[0060] For example, when transmitting a 320MHz EHT PPDU, the subcarrier index value belongs to the closed interval of -512 to 511, that is, k∈[-512,511]. Correspondingly,

[0061]

[0062] or,

[0063]

[0064] (4) Preamble puncturing

[0065] Preamble puncturing, also known as preamble breakdown, involves leaving a 20MHz channel empty (or skipped) within the entire bandwidth. This is called a 20MHz hole in the bandwidth. This technology improves transmission efficiency by skipping untransmittable subchannels within the bandwidth and using the remaining channels for transmission.

[0066] For Orthogonal Frequency Division Multiple Access (OFDMA) transmission, since the entire bandwidth is divided into multiple resource units (RUs), that is, the allocation of user band resources is not based on channels, but on RUs. Therefore, the discrete resources created by puncturing can be allocated to different STAs or allocated as a whole to one or a group of STAs. For example, a 20MHz channel can contain multiple RUs in the form of 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, 484-tone RUs, 996-tone RUs, etc., where tone represents the number of subcarriers.

[0067] For non-OFDMA transmissions, such as Orthogonal Frequency Division Multiplexing (OFDM), if preamble puncturing is used, the remaining unpunctured resources also form multiple RUs. However, these RUs can only be combined as a whole and allocated to one or a group of STAs. In other words, the entire transmission bandwidth is used as a whole for single-user (SU) or MU-MIMO transmissions. The multi-RU combination supported by non-OFDMA transmissions is equivalent to the preamble puncturing combination supported by non-OFDMA transmissions.

[0068] Currently, the channel bandwidths specified in Wireless Fidelity (Wi-Fi) technologies are 20 MHz, 40 MHz, 80 MHz, 160 MHz, and 320 MHz. However, there is no definitive solution for phase rotation for potential next-generation Wi-Fi communication bandwidths, such as 240 MHz, 480 MHz, and 640 MHz. In particular, phase rotation schemes for scenarios with and without preamble puncturing require further exploration.

[0069] Therefore, the present application provides a PPDU transmission method in a Wi-Fi system, which generates a duplicate transmission field in the PPDU based on a target phase rotation sequence, so that the PAPR of the signal corresponding to the transmission bandwidth of the PPDU is low, which is conducive to improving the efficiency and reliability of wireless transmission.

[0070] FIG4 is a schematic diagram of a Wi-Fi system provided by an exemplary embodiment of the present application. The Wi-Fi system includes terminal devices and terminal devices, or terminal devices and network devices, or APs and STAs, which are not limited in this application. This application uses the Wi-Fi system including AP 410 and STA 420 as an example for description.

[0071] In some scenarios, an AP can be referred to as an AP STA, meaning that in a sense, an AP is also a type of STA. In some scenarios, a STA can be referred to as a non-AP STA.

[0072] In some embodiments, STAs may include AP STAs and non-AP STAs.

[0073] Communication in a Wi-Fi system can be between an AP and a non-AP STA, between a non-AP STA and a non-AP STA, or between a STA and a peer STA. A peer STA refers to a device that communicates with a STA. For example, a peer STA may be an AP or a non-AP STA.

[0074] An AP acts as a bridge between a wired network and a wireless network. Its primary function is to connect wireless network clients together and then connect the wireless network to the Ethernet. An AP device can be a terminal device or a network device equipped with a Wi-Fi chip.

[0075] It should be understood that the role of STA in the communication system is not absolute. For example, in some scenarios, when a mobile phone is connected to a router, the mobile phone is a non-AP STA. When the mobile phone serves as a hotspot for other mobile phones, the mobile phone plays the role of AP.

[0076] APs and non-AP STAs can be devices used in the Internet of Vehicles, IoT nodes and sensors in the Internet of Things (IoT), smart cameras, smart remote controls, smart water and electricity meters in smart homes, and sensors in smart cities.

[0077] In some embodiments, non-AP STAs can support the 802.11be standard. Non-AP STAs can also support various current and future 802.11 family WLAN standards, including 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. Non-AP STAs can also be used in network environments supporting next-generation Wi-Fi communications, which refers to any new generation of Wi-Fi communications after Wi-Fi 7 based on the IEEE 802.11be specification, such as UHR communications.

[0078] In some embodiments, the AP may be a device supporting the 802.11be standard. The AP may also be a device supporting various current and future 802.11 family WLAN standards, such as 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, and 802.11a. The AP may also be used in a network environment supporting next-generation Wi-Fi communications, which refers to any new generation of Wi-Fi communications after Wi-Fi 7 based on the IEEE 802.11be specification, such as UHR communications.

[0079] In the embodiment of the present application, the STA may be a mobile phone, a tablet computer, an e-book reader, a laptop computer, a desktop computer, a television, a virtual reality (VR) device, an augmented reality (AR) device, a mixed reality (MR) device, an extended reality (XR) device, a baffle reality (BR) device, a cinematic reality (CR) device, a deceived reality (DR) device, a wireless device in industrial control, a set-top box, a wireless device in self-driving, an in-vehicle communication device, a wireless device in remote medical care, a wireless device in smart grid, a wireless device in transportation safety, a wireless device in smart city or a wireless device in smart home, a wireless communication chip, an application specific integrated circuit (ASIC), or a wireless communication chip. Circuit, ASIC), System on Chip (SoC), etc.

[0080] The Wi-Fi system in the embodiment of the present application can support frequency bands including but not limited to: low frequency bands (2.4 GHz, 5 GHz, 6 GHz) and high frequency bands (45 GHz, 60 GHz).

[0081] There are one or more links between the STA and the AP.

[0082] In some embodiments, STAs and APs support multi-band communication, for example, simultaneously communicating on the 2.4 GHz, 5 GHz, 6 GHz, 45 GHz, and 60 GHz frequency bands, or simultaneously communicating on different channels within the same frequency band (or different frequency bands), thereby improving the communication throughput and / or reliability between devices. Such devices are generally referred to as multi-band devices, or multi-link devices (MLDs), and are sometimes also referred to as multi-link entities or multi-band entities. A multi-link device can be either an AP or a STA. If the multi-link device is an AP, it includes one or more APs; if the multi-link device is a STA, it includes one or more non-AP STAs.

[0083] A multi-link device including one or more APs is called an AP, and a multi-link device including one or more non-AP STAs is called a Non-AP. In the embodiment of the application, the Non-AP can be called a STA.

[0084] In some embodiments, STAs exist in the form of one or more Basic Service Sets (BSSs), which are a collection of STAs that can successfully synchronize to communicate with each other. A BSS may or may not include an AP.

[0085] In some embodiments, the AP may include multiple APs, the Non-AP may include multiple STAs, multiple links may be formed between the APs in the AP and the STAs in the Non-AP, and the APs in the AP and the corresponding STAs in the Non-AP may communicate through the corresponding links.

[0086] In some embodiments, an AP is a device deployed in a WLAN / Wi-Fi system to provide wireless communication capabilities for STAs. STAs may be: User Equipment (UE), Access Terminal, Subscriber Unit, Subscriber Station, Mobile Station, Mobile Station, Remote Station, Remote Terminal, Mobile Device, Wireless Communication Device, User Agent, or User Equipment. STAs may also be cellular phones, cordless phones, Session Initiation Protocol (SIP) phones, Wireless Local Loop (WLL) stations, Personal Digital Assistants (PDAs), handheld devices with wireless communication capabilities, computing devices or other processing devices connected to a wireless modem, vehicle-mounted devices, or wearable devices, but the embodiments of the present application are not limited thereto.

[0087] In some embodiments, both the AP and the STA support the IEEE 802.11 standard, but are not limited to the IEEE 802.11 standard.

[0088] FIG5 is a flow chart illustrating a method for transmitting a PPDU in a Wi-Fi system according to some exemplary embodiments of the present application. The method is illustrated by taking the Wi-Fi system shown in FIG4 as an example. The method includes at least some of the following steps:

[0089] Step 510: Send a PPDU in a transmission bandwidth, where the PPDU includes a field that is replicated and transmitted in units of a first bandwidth.

[0090] This field is generated based on the target phase rotation sequence. The target phase rotation sequence is derived based on the first phase rotation sequence and the second phase rotation sequence. The first phase rotation sequence is a phase rotation sequence based on the first bandwidth, the second phase rotation sequence is a phase rotation sequence based on the second bandwidth, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0091] In some embodiments, the field includes at least one of the following:

[0092] The pre-UHR modulation field in the UHR PPDU;

[0093] Non-HT duplicates the fields in the transmit PPDU.

[0094] In some embodiments, the pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field.

[0095] In some embodiments, the fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a Data field.

[0096] In some embodiments, at least one of a data frame, a control frame, and a management frame is transmitted via a non-HT duplicate transmission PPDU.

[0097] In some embodiments, the first bandwidth is a 20 MHz bandwidth.

[0098] In some embodiments, the second bandwidth is a 20 MHz bandwidth or an 80 MHz bandwidth or a 160 MHz bandwidth or a 240 MHz bandwidth.

[0099] In some embodiments, the transmission bandwidth is a punctured bandwidth, meaning that a portion of the subchannels in the transmission bandwidth are punctured. Alternatively, it can be understood that a portion of the subchannels in the transmission bandwidth are left empty. Alternatively, when transmitting the PPDU, a portion of the subchannels in the transmission bandwidth are skipped or not used to transmit the PPDU.

[0100] In some embodiments, the transmission bandwidth is a non-punctured bandwidth, meaning that there are no punctured subchannels in the transmission bandwidth. Alternatively, this can be understood as meaning that there are no empty subchannels in the transmission bandwidth. Alternatively, when transmitting the PPDU, all subchannels in the transmission bandwidth are used to transmit the PPDU.

[0101] In some embodiments, the puncturing granularity of the transmission bandwidth is at least one of the following:

[0102] 20MHz;

[0103] 40MHz;

[0104] 80MHz.

[0105] In some embodiments, the transmission bandwidth is at least one of 80 MHz, 160 MHz, 240 MHz, 480 MHz, and 640 MHz.

[0106] In some embodiments, the transmission bandwidth may be greater than 640 MHz.

[0107] In some embodiments, the transmission bandwidth is obtained by puncturing the third bandwidth, that is, the transmission bandwidth is obtained by puncturing a portion of sub-channels in the third bandwidth.

[0108] In some embodiments, as shown in FIG6 , the transmission bandwidth is obtained by unilaterally punching holes on the third bandwidth, or, as shown in FIG7 , the transmission bandwidth is obtained by symmetrically punching holes on both sides of the center frequency point of the third bandwidth.

[0109] In some embodiments, as shown in FIG8 , the transmission bandwidth is obtained by puncturing any portion of sub-channels in the third bandwidth.

[0110] In summary, the method provided in this embodiment obtains a target phase rotation sequence based on the first phase rotation sequence and the second phase rotation sequence, and generates fields in the PPDU based on the target phase rotation sequence. This is beneficial for achieving a better PAPR when the PPDU is sent within the transmission bandwidth, thereby improving the transmission efficiency and stability of the Wi-Fi system.

[0111] FIG6 is a flow chart illustrating a method for transmitting a PPDU in a Wi-Fi system provided by some exemplary embodiments of the present application. The method is illustrated by taking the method performed by a first wireless device and a second wireless device as an example. The method includes at least some of the following steps:

[0112] Step 610: The first wireless device sends a PPDU in a transmission bandwidth, where the PPDU includes a field that is replicated and transmitted in units of a first bandwidth.

[0113] The first wireless device 601 may be the AP 410 in the Wi-Fi system shown in FIG. 4 , or may be the STA 420 in the Wi-Fi system shown in FIG. 4 .

[0114] In some embodiments, the first wireless device 601 sends a PPDU to the second wireless device 602 in a transmission bandwidth, the PPDU including a field that is replicated in units of the first bandwidth.

[0115] The second wireless device 602 may be the AP 410 in the Wi-Fi system shown in FIG. 4 , or may be the STA 420 in the Wi-Fi system shown in FIG. 4 .

[0116] This field is generated based on the target phase rotation sequence. The target phase rotation sequence is derived based on the first phase rotation sequence and the second phase rotation sequence. The first phase rotation sequence is a phase rotation sequence based on the first bandwidth, the second phase rotation sequence is a phase rotation sequence based on the second bandwidth, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0117] In some embodiments, the field includes at least one of the following:

[0118] The pre-UHR modulation field in the UHR PPDU;

[0119] Non-HT duplicates the fields in the transmit PPDU.

[0120] In some embodiments, the pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field.

[0121] In some embodiments, the fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a Data field.

[0122] In some embodiments, the first bandwidth is a 20 MHz bandwidth.

[0123] In some embodiments, the second bandwidth is a 20 MHz bandwidth or an 80 MHz bandwidth or a 160 MHz bandwidth or a 240 MHz bandwidth.

[0124] In some embodiments, the transmission bandwidth is a punctured bandwidth, meaning that a portion of the subchannels in the transmission bandwidth are punctured. Alternatively, it can be understood that a portion of the subchannels in the transmission bandwidth are left empty. Alternatively, when transmitting the PPDU, a portion of the subchannels in the transmission bandwidth are skipped or not used to transmit the PPDU.

[0125] In some embodiments, the transmission bandwidth is a non-punctured bandwidth, meaning that there are no punctured subchannels in the transmission bandwidth. Alternatively, this can be understood as meaning that there are no empty subchannels in the transmission bandwidth. Alternatively, when transmitting the PPDU, all subchannels in the transmission bandwidth are used to transmit the PPDU.

[0126] In some embodiments, the puncturing granularity of the transmission bandwidth is at least one of the following:

[0127] 20MHz;

[0128] 40MHz;

[0129] 80MHz.

[0130] In some embodiments, the transmission bandwidth is at least one of 80 MHz, 160 MHz, 240 MHz, 480 MHz, and 640 MHz.

[0131] In some embodiments, the transmission bandwidth may be larger than 640 MHz, such as 720 MHz, 800 MHz, and so on.

[0132] In some embodiments, the transmission bandwidth is obtained by puncturing the third bandwidth, that is, the transmission bandwidth is obtained by puncturing a portion of sub-channels in the third bandwidth.

[0133] In some embodiments, the transmission bandwidth is obtained by unilaterally punching holes on the third bandwidth, as shown in FIG7 ; or, the transmission bandwidth is obtained by symmetrically punching holes on both sides of the center frequency point of the third bandwidth.

[0134] In some embodiments, the transmission bandwidth is obtained by puncturing an arbitrary portion of sub-channels in the third bandwidth.

[0135] Step 630: The second wireless device receives a PPDU including a field transmitted in duplicate in units of the first bandwidth.

[0136] In some embodiments, the second wireless device 602 receives a PPDU transmitted by the first wireless device 601 in the transmission bandwidth, where the PPDU includes a field that is replicated and transmitted in units of the first bandwidth.

[0137] In summary, the method provided in this embodiment obtains a target phase rotation sequence based on the first phase rotation sequence and the second phase rotation sequence, and generates fields in the PPDU based on the target phase rotation sequence. This is beneficial for achieving a better PAPR when the PPDU is sent within the transmission bandwidth, thereby improving the transmission efficiency and stability of the Wi-Fi system.

[0138] The following mainly introduces the phase rotation scheme and effect when the transmission bandwidth is 240 MHz, 480 MHz, or 640 MHz.

[0139] It should be understood that the application of the phase rotation scheme proposed in this application is not limited to transmission bandwidths of 240 MHz, 480 MHz, or 640 MHz. Phase rotation conditions for other bandwidths can be adaptively adjusted based on the phase rotation scheme proposed in this application. For example, an 80 MHz transmission bandwidth can be considered as 1 / 3 of a 240 MHz transmission bandwidth. When applying phase rotation to the 80 MHz transmission bandwidth, adjustments can be made based on the phase rotation scheme for the 240 MHz transmission bandwidth. For another example, a 320 MHz transmission bandwidth can be considered as a combination of a 240 MHz and an 80 MHz transmission bandwidth. When applying phase rotation to the 320 MHz transmission bandwidth, a combination of the phase rotation schemes for the 240 MHz and 80 MHz transmission bandwidths can be made.

[0140] It should be understood that the effects of the phase rotation scheme proposed in this application, such as the PAPR-related situation, are considered with the transmission bandwidth as a whole. For example, when the transmission bandwidth is 240 MHz, regardless of whether the preamble is punctured or not, the 240 MHz transmission bandwidth is considered as a whole for the purpose of considering one PAPR; when the transmission bandwidth is 480 MHz, regardless of whether the preamble is punctured or not, the 480 MHz transmission bandwidth is considered as a whole for the purpose of considering one PAPR; when the transmission bandwidth is 640 MHz, regardless of whether the preamble is punctured or not, the 640 MHz transmission bandwidth is considered as a whole for the purpose of considering one PAPR. However, this does not mean that the effects of the phase rotation scheme proposed in this application, such as the PAPR-related situation, are not applicable when only the PAPR corresponding to a portion of the subchannels in the transmission bandwidth is considered.

[0141] When the transmission bandwidth is 240MHz:

[0142] Taking a 20 MHz first bandwidth and an 80 MHz second bandwidth as an example, the fields in the PPDU that are replicated and transmitted in 20 MHz units are generated based on a target phase rotation sequence, which is derived based on a first phase rotation sequence and a second phase rotation sequence. The first phase rotation sequence is a phase rotation sequence applied in 20 MHz units, and the second phase rotation sequence is a phase rotation sequence applied in 80 MHz units. The second bandwidth is 22 times, or four times, the first bandwidth, and the transmission bandwidth is three times the second bandwidth.

[0143] The field in the PPDU that is replicated and transmitted in units of 20 MHz may be a pre-UHR modulation field in the UHR PPDU, or may be understood as a subfield or partial field in the UHR PPDU. The pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field.

[0144] The fields in the PPDU that are duplicated and transmitted every 20 MHz may also be fields in the non-HT duplicate transmission PPDU. The fields in the non-HT duplicate transmission PPDU include at least one of the L-STF field, the L-LTF field, the L-SIG field, and the data field, for example, all fields in the non-HT duplicate transmission PPDU.

[0145] The phase rotation values ​​in the first phase rotation sequence can be any value among 1, -1, j, and -j. For example, the first phase rotation sequence is determined based on the phase rotation values ​​defined for the 80 MHz band in the 802.11ax system and is [1 -1 -1 -1], where "1" is applied to the first 20 MHz subchannel, and the three "-1"s are applied to the second, third, and fourth 20 MHz subchannels, respectively.

[0146] For example, all fields in the non-HT duplicate transmission PPDU are duplicated and transmitted in units of 20 MHz on an 80 MHz frequency band, and a schematic diagram of applying the first phase rotation sequence can be referred to in FIG8 .

[0147] The phase rotation value in the second phase rotation sequence can be any value among 1, -1, j, and -j.

[0148] The phase rotation value in the target phase rotation sequence can be any value among 1, -1, j, and -j.

[0149] This application is schematically illustrated by taking the example that the phase rotation values ​​in the first phase rotation sequence include 1 or -1, the phase rotation values ​​in the second phase rotation sequence include 1 or -1, and the phase rotation values ​​in the target phase rotation sequence include 1 or -1.

[0150] When the transmission bandwidth is 240 MHz, the subcarrier index k in the transmission bandwidth belongs to a closed interval between -384 and 383, that is, k∈[-384,383]. The target phase rotation sequence is related to the phase rotation value corresponding to each 80 MHz frequency subblock. The phase rotation value in the target phase rotation sequence includes at least one of the following:

[0151] When k is less than -320, the phase rotation value is

[0152] When k is greater than or equal to -320 and k is less than -128, the phase rotation value is

[0153] When k is greater than or equal to -128 and k is less than -64, the phase rotation value is

[0154] When k is greater than or equal to -64 and k is less than 128, the phase rotation value is

[0155] When k is greater than or equal to 128 and k is less than 192, the phase rotation value is

[0156] When k is greater than or equal to 192, the phase rotation value is

[0157] in, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, and -j. and For example, a schematic diagram of applying such a target phase rotation sequence to all fields in a non-HT duplicate transmission PPDU for non-HT duplicate transmission can be referred to FIG9 .

[0158] That is to say,

[0159]

[0160] Transmission bandwidth has the following two forms:

[0161] 1. Transmission bandwidth is non-punctured bandwidth

[0162] In other words, there are no punctured subchannels in the transmission bandwidth. Alternatively, there are no empty channels in the transmission bandwidth. Alternatively, when transmitting a PPDU, all subchannels in the transmission bandwidth are used to transmit the PPDU.

[0163] 2. Transmission bandwidth is the perforation bandwidth

[0164] In other words, some subchannels in the transmission bandwidth are punctured. Alternatively, some subchannels in the transmission bandwidth are left empty. Alternatively, when transmitting a PPDU, some subchannels in the transmission bandwidth are skipped or not used to transmit the PPDU.

[0165] Taking the 20MHz puncturing granularity for a 240MHz transmission bandwidth as an example, there are two puncturing methods:

[0166] Method 1): Puncturing a 20 MHz subchannel in the 240 MHz transmission bandwidth creates a 2×996+484+242-tone MRU. This method has 12 puncturing patterns, and 2×996+484+242-tone MRU 1 to 12 represent the bandwidths obtained under these 12 puncturing patterns, as shown in Figure 10.

[0167] Method 2): Puncturing a 40 MHz subchannel in the 240 MHz transmission bandwidth creates a 2×996+484-tone MRU. This method has six puncturing patterns, and 2×996+484-tone MRU 1 to 6 represent the bandwidths obtained under the six puncturing patterns, respectively.

[0168] Therefore, there are 18 puncturing patterns in the 240 MHz transmission bandwidth.

[0169] To understand the bandwidth formed after punching, you can refer to Table 1 below.

[0170] Table 1: Bandwidth and RU Correspondence

[0171] Bandwidth RU size 20 MHz 242-tone 40 MHz 484-tone 80 MHz 996-tone 160 MHz 2 × 996-tone 240 MHz 3 × 996-tone 320 MHz 4 × 996-tone 480 MHz 6 × 996-tone 640 MHz 8 × 996-tone

[0172] Therefore, the 2×996+484+242-tone MRU can be understood as a combination of 160 MHz bandwidth, 40 MHz bandwidth, and 20 MHz bandwidth. That is, the bandwidth is formed by puncturing a 20 MHz subchannel in the 240 MHz transmission bandwidth. The MRU is formed by combining the 2×996-tone corresponding to the 160 MHz bandwidth, the 484-tone corresponding to the 40 MHz bandwidth, and the 242-tone corresponding to the 20 MHz bandwidth.

[0173] The 2×996+484-tone MRU can be understood as a combination of 160 MHz bandwidth and 40 MHz bandwidth. That is, the bandwidth is formed by puncturing a 40 MHz subchannel in the 240 MHz transmission bandwidth. The MRU is formed by combining the 2×996-tone corresponding to the 160 MHz bandwidth and the 484-tone corresponding to the 40 MHz bandwidth.

[0174] Based on the various 240 MHz transmission bandwidths described above, the following phase rotation schemes are proposed to achieve optimal PAPR. These schemes are based on a comparison of the PAPRs obtained by applying each target rotation sequence to the various 240 MHz transmission bandwidths described above (including non-punctured bandwidths and punctured bandwidths using the 18 puncturing modes). The optimal phase rotation schemes are selected based on a comparison of the PAPRs obtained by applying each target rotation sequence to the various 240 MHz transmission bandwidths described above.

[0175] Option 1A: That is,

[0176]

[0177] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0178] The second phase rotation sequence is [-1 1 1], wherein the first value "-1" is applied to the first 80 MHz sub-channel, the second value "1" is applied to the second 80 MHz sub-channel, and the third value "1" is applied to the third 80 MHz sub-channel.

[0179] Based on the first phase rotation sequence and the second phase rotation sequence, the target phase rotation sequence is [-1 1 1 1 1 -1 -1 -1 -1 -1]. The first value "-1" is applied to the first 20 MHz subchannel in the first 80 MHz subchannel, that is, to the subcarrier k∈[-384,-320); the second value "1" is applied to the second 20 MHz subchannel in the first 80 MHz subchannel, that is, to the subcarrier k∈[-320,-256); the third value "1" is applied to the third 20 MHz subchannel in the first 80 MHz subchannel, that is, to the subcarrier k∈[-256,-192); the fourth value "1" is applied to the fourth 20 MHz subchannel in the first 80 MHz subchannel, that is, to the subcarrier k∈[-192,-128); and the fifth value "1" is applied to the first 20 MHz subchannel in the second 80 MHz subchannel, that is, to the subcarrier k∈[-192,-128]. The sixth value “-1” is applied to the second 20 MHz subchannel in the second 80 MHz subchannel, that is, to the subcarriers with k∈? (-64, -0); the seventh value “-1” is applied to the third 20 MHz subchannel in the second 80 MHz subchannel, that is, to the subcarriers with k∈? (0, 64); the eighth value “-1” is applied to the fourth 20 MHz subchannel in the second 80 MHz subchannel, that is, to the subcarriers with k∈? (64, 128); the ninth value “1” is applied to the first 20 MHz subchannel in the third 80 MHz subchannel, that is, to the subcarriers with k∈? (128, 192); the tenth value “-1” is applied to the second 20 MHz subchannel in the third 80 MHz subchannel, that is, to the subcarriers with k∈? (192, 256); and the eleventh value “-1” is applied to the third 20 MHz subchannel in the third 80 MHz subchannel, that is, to the subcarriers with k∈? the twelfth value "-1" is applied to the fourth 20MHz subchannel in the third 80MHz subchannel, that is, applied to the subcarrier k∈? 320,383].

[0180] Option 1B: That is,

[0181]

[0182] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0183] The second phase rotation sequence is [1 1 -1], where the first value "1" is applied to the first 80 MHz sub-channel, the second value "1" is applied to the second 80 MHz sub-channel, and the third value "-1" is applied to the third 80 MHz sub-channel.

[0184] Based on the first phase rotation sequence and the second phase rotation sequence, the target phase rotation sequence is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0185] Option 1C: That is,

[0186]

[0187] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0188] The second phase rotation sequence is [-1 -1 1], wherein the first value "-1" is applied to the first 80 MHz sub-channel, the second value "-1" is applied to the second 80 MHz sub-channel, and the third value "1" is applied to the third 80 MHz sub-channel.

[0189] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 -1 1 1 1 1 -1 -1 -1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0190] Option 1D: That is,

[0191]

[0192] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0193] The second phase rotation sequence is [1 -1 -1], where the first value "1" is applied to the first 80 MHz sub-channel, the second value "-1" is applied to the second 80 MHz sub-channel, and the third value "-1" is applied to the third 80 MHz sub-channel.

[0194] Based on the first phase rotation sequence and the second phase rotation sequence, the target phase rotation sequence is [1 -1 -1 -1 -1 1 1 1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0195] The PAPRs corresponding to schemes 1A to 1D are shown in Table 2 below.

[0196] Table 2: PAPR of different phase rotation schemes under 240MHz transmission bandwidth

[0197]

[0198] Among them, the control group 1 applied The control group scheme 1 is a target rotation sequence randomly selected from all target rotation sequences corresponding to the transmission bandwidth of 240 MHz.

[0199] As shown in Table 2, when the 240 MHz transmission bandwidth is non-punctured, Schemes 1A to 1D have the same PAPR, and all achieve a relatively good PAPR. This is because, compared to the target phase rotation sequence used in Scheme 1 in the control group, the target phase rotation sequences used in Schemes 1A to 1D result in different phase rotation values ​​(i.e., a 180° phase rotation difference) for the two 80 MHz frequency domain sub-blocks (i.e., 80 MHz sub-channels) at the edges of the transmission bandwidth. This results in a lower PAPR and better transmission efficiency and stability for the Wi-Fi system.

[0200] When the 240MHz transmission bandwidth is the punctured bandwidth and the first target subchannel is punctured within the transmission bandwidth, Schemes 1A and 1D can reduce the worst-case PAPR. This is because the phase rotation value of the 80MHz frequency domain sub-block where the punctured subchannel is located is different from the phase rotation value of the adjacent 80MHz frequency domain sub-block where the punctured subchannel is located (i.e., the phase rotation differs by 180°). In other words, when the target phase rotation sequence in Scheme 1A or 1D is applied, the maximum PAPR during PPDU transmission remains low, resulting in better transmission efficiency and stability for the Wi-Fi system. However, Schemes 1B and 1C result in higher worst-case PAPR, which is detrimental to the transmission efficiency and stability of the Wi-Fi system.

[0201] In some embodiments, the first target subchannel is the eighth 20 MHz subchannel in the 240 MHz transmission bandwidth, arranged from low to high in the frequency domain. That is, when the eighth 20 MHz subchannel in the 240 MHz transmission bandwidth is arranged from low to high in the frequency domain, Scheme 1A and Scheme 1D are the PAPR-optimal schemes among Schemes 1A-1D.

[0202] In some embodiments, the transmission bandwidth is obtained by puncturing the third bandwidth. For example, a 240 MHz transmission bandwidth is formed by puncturing an 80 MHz sub-channel from a 320 MHz bandwidth.

[0203] In some embodiments, the transmission bandwidth is obtained by unilaterally puncturing the third bandwidth, for example, puncturing the 80 MHz sub-channel with the lowest frequency domain on the 320 MHz bandwidth, or puncturing the 80 MHz sub-channel with the highest frequency domain on the 320 MHz bandwidth, to form a transmission bandwidth of 240 MHz.

[0204] In some embodiments, the transmission bandwidth is obtained by symmetrically punching holes on both sides of the center frequency point of the third bandwidth.

[0205] When the transmission bandwidth is 480MHz:

[0206] Taking a first bandwidth of 20 MHz and a second bandwidth of 80 MHz as an example, the fields in the PPDU that are replicated and transmitted in 20 MHz units are generated based on a target phase rotation sequence, which is derived based on a first phase rotation sequence and a second phase rotation sequence. The first phase rotation sequence is a phase rotation sequence applied in 20 MHz units, and the second phase rotation sequence is a phase rotation sequence applied in 80 MHz units. The second bandwidth is 22 times, or 4 times, the first bandwidth, and the transmission bandwidth is 6 times the second bandwidth.

[0207] The field in the PPDU that is duplicated and transmitted every 20 MHz may be a pre-UHR modulation field in a UHR PPDU or a field in a non-HT duplicate transmission PPDU. The pre-UHR modulation field includes at least one of the L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, the U-SIG field, and the UHR-SIG field. The field in the non-HT duplicate transmission PPDU includes at least one of the L-STF field, the L-LTF field, the L-SIG field, and the data field.

[0208] The phase rotation values ​​in the first phase rotation sequence can be any value among 1, -1, j, and -j. For example, the first phase rotation sequence is determined based on the phase rotation values ​​defined for the 80 MHz band in the 802.11ax system and is [1 -1 -1 -1], where "1" is applied to the first 20 MHz subchannel, and the three "-1"s are applied to the second, third, and fourth 20 MHz subchannels, respectively.

[0209] The phase rotation value in the second phase rotation sequence can be any value among 1, -1, j, and -j.

[0210] The phase rotation value in the target phase rotation sequence can be any value among 1, -1, j, and -j.

[0211] This application is schematically illustrated by taking as an example that the phase rotation value in the first phase rotation sequence is 1 or -1, the phase rotation value in the second phase rotation sequence is 1 or -1, and the phase rotation value in the target phase rotation sequence is 1 or -1.

[0212] When the transmission bandwidth is 480 MHz, the subcarrier index k in the transmission bandwidth belongs to a closed interval between -768 and 767, that is, k∈[-768,767], the target phase rotation sequence is related to the phase rotation value corresponding to each 80 MHz frequency domain subblock, and the phase rotation value in the target phase rotation sequence includes at least one of the following:

[0213] When k is less than -704, the phase rotation value is

[0214] When k is greater than or equal to -704 and k is less than -512, the phase rotation value is

[0215] When k is greater than or equal to -512 and k is less than -448, the phase rotation value is

[0216] When k is greater than or equal to -448 and k is less than -256, the phase rotation value is

[0217] When k is greater than or equal to -256 and k is less than -192, the phase rotation value is

[0218] When k is greater than or equal to -192 and k is less than 0, the phase rotation value is

[0219] When k is greater than or equal to 0 and k is less than 64, the phase rotation value is

[0220] When k is greater than or equal to 64 and k is less than 256, the phase rotation value is

[0221] When k is greater than or equal to 256 and k is less than 320, the phase rotation value is

[0222] When k is greater than or equal to 320 and k is less than 512, the phase rotation value is

[0223] When k is greater than or equal to 512 and k is less than 576, the phase rotation value is

[0224] When k is greater than or equal to 576, the phase rotation value is

[0225] in, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, and -j. and The values ​​can be the same or different.

[0226] That is to say,

[0227]

[0228] In some embodiments, The value of is non-periodic.

[0229] Transmission bandwidth has the following two forms:

[0230] 1. Transmission bandwidth is non-punctured bandwidth

[0231] In other words, there are no punctured subchannels in the transmission bandwidth. Alternatively, there are no empty channels in the transmission bandwidth. Alternatively, when transmitting a PPDU, all subchannels in the transmission bandwidth are used to transmit the PPDU.

[0232] Based on the 480MHz transmission bandwidth being non-punctured, the following proposes several phase rotation schemes that achieve optimal PAPR. These schemes are based on comparing the PAPR obtained by applying each target rotation sequence to the 480MHz transmission bandwidth in a non-punctured manner.

[0233] Option 2A: That is,

[0234]

[0235] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0236] The second phase rotation sequence is [1 -1 1 1 1 1], where the first value "1" is applied to the first 80 MHz subchannel, the second value "-1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, and the sixth value "1" is applied to the sixth 80 MHz subchannel.

[0237] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 -1 -1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0238] Option 2B: That is,

[0239]

[0240] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0241] The second phase rotation sequence is [1 1 1 -1 1 1], where the first value "1" is applied to the first 80 MHz subchannel, the second value "1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "-1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, and the sixth value "1" is applied to the sixth 80 MHz subchannel.

[0242] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [1 -1 -1 -1 1 -1 -1 -1 -1 -1 -1 -1 1 1 1 -1 -1 -1 -1 -1 1 -1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0243] Option 2C: That is,

[0244]

[0245] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0246] The second phase rotation sequence is [-1 -1 -1 1 -1 -1], where the first value "-1" is applied to the first 80 MHz subchannel, the second value "-1" is applied to the second 80 MHz subchannel, the third value "-1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "-1" is applied to the fifth 80 MHz subchannel, and the sixth value "-1" is applied to the sixth 80 MHz subchannel.

[0247] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 -1 1 1 1 1 -1 -1 -1 -1 1 1 1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0248] Option 2D: That is,

[0249]

[0250] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0251] The second phase rotation sequence is [1 1 -1 1 1 1], where the first value "1" is applied to the first 80 MHz subchannel, the second value "1" is applied to the second 80 MHz subchannel, the third value "-1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, and the sixth value "1" is applied to the sixth 80 MHz subchannel.

[0252] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [1 -1 -1 -1 1 -1 -1 -1 -1 1 1 1 -1 -1 -1 -1 -1 -1 -1 1 -1 -1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0253] 2. Transmission bandwidth is the perforation bandwidth

[0254] In other words, some subchannels in the transmission bandwidth are punctured. Alternatively, some subchannels in the transmission bandwidth are left empty. Alternatively, when transmitting a PPDU, some subchannels in the transmission bandwidth are skipped or not used to transmit the PPDU.

[0255] Taking the 480 MHz transmission bandwidth with a 40 MHz puncturing granularity as an example, there are three puncturing methods:

[0256] Method 1): Puncturing a 40 MHz subchannel in the 480 MHz transmission bandwidth creates a 5×996+484-tone MRU. This method has 12 puncturing patterns, and 5×996+484-tone MRU 1 to 12 represent the bandwidths obtained under each of the 12 puncturing patterns.

[0257] Method 2): Puncturing an 80 MHz subchannel within the 480 MHz transmission bandwidth creates a 5×996-tone MRU. This method has six puncturing patterns, with 5×996-tone MRU 1 to 6 representing the bandwidths obtained under each of the six puncturing patterns.

[0258] Method 3): Puncture one 80 MHz subchannel and one 40 MHz subchannel in the 480 MHz transmission bandwidth to form a 4×996+484-tone MRU. This method has 20 puncturing patterns, and 4×996+484-tone MRU 1 to 20 can be used to represent the bandwidth obtained under the 20 puncturing patterns.

[0259] Therefore, there are 38 puncturing patterns in the 480 MHz transmission bandwidth.

[0260] Based on the 480 MHz transmission bandwidth being a punctured bandwidth, the following phase rotation schemes are proposed to achieve optimal PAPR. These schemes are based on comparing the PAPR obtained by applying each target rotation sequence to the 480 MHz transmission bandwidth under the aforementioned 38 puncturing patterns.

[0261] Option 2E: That is,

[0262]

[0263] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0264] The second phase rotation sequence is [1 -1 -1 -1 -1 1], where the first value "1" is applied to the first 80 MHz subchannel, the second value "-1" is applied to the second 80 MHz subchannel, the third value "-1" is applied to the third 80 MHz subchannel, the fourth value "-1" is applied to the fourth 80 MHz subchannel, the fifth value "-1" is applied to the fifth 80 MHz subchannel, and the sixth value "1" is applied to the sixth 80 MHz subchannel.

[0265] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [1 -1 -1 -1 -1 1 1 1 -1 1 1 1 -1 1 1 1 -1 -1 1 1 1 -1 -1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0266] Option 2F: That is,

[0267]

[0268] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0269] The second phase rotation sequence is [-1 1 1 1 1 -1], where the first value "-1" is applied to the first 80 MHz subchannel, the second value "1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, and the sixth value "-1" is applied to the sixth 80 MHz subchannel.

[0270] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0271] The PAPRs corresponding to schemes 2A to 2F are shown in Table 3 below.

[0272] Table 3: PAPR of different phase rotation schemes under 480MHz transmission bandwidth

[0273]

[0274] Among them, the control group 2 used The control group scheme 2 is a target rotation sequence randomly selected from all target rotation sequences corresponding to the transmission bandwidth of 480 MHz.

[0275] When the 480 MHz transmission bandwidth is a non-punctured bandwidth, the PAPR conditions corresponding to schemes 2A to 2D make the PAPR better. This is because the target phase rotation sequence applied in scheme 2 has periodic phase rotation values ​​( The target phase rotation sequence used in Schemes 2A to 2D ensures that the phase rotation value of each 80 MHz frequency domain sub-block in the transmission bandwidth appears non-periodically. Moreover, among all 80 MHz frequency domain sub-blocks in the transmission bandwidth, if the phase rotation value of one 80 MHz frequency domain sub-block differs from the phase rotation values ​​of other 80 MHz frequency domain sub-blocks by -1 (i.e., the phase rotation differs by 180°), the PAPR of the PPDU will be lower, thereby improving the transmission efficiency and stability of the Wi-Fi system.

[0276] When the 480 MHz transmission bandwidth is the puncturing bandwidth and the second target subchannel is punctured in the transmission bandwidth, Schemes 2E and 2F can reduce the worst PAPR. This is because the target phase rotation sequence used in Scheme 2 has periodic phase rotation values ​​( The target phase rotation sequence used in Schemes 2A to 2D ensures that the phase rotation value of each 80 MHz frequency domain sub-block in the transmission bandwidth is non-periodic. Furthermore, among all 80 MHz frequency domain sub-blocks in the transmission bandwidth, when the phase rotation values ​​of the two 80 MHz frequency domain sub-blocks at the edges of the transmission bandwidth differ by -1 from the phase rotation values ​​of the other 80 MHz frequency domain sub-blocks (i.e., a phase rotation difference of 180°), the PAPR of the PPDU is lower, resulting in better transmission efficiency and stability of the Wi-Fi system.

[0277] In some embodiments, the second target subchannel is the third 80 MHz subchannel in the 480 MHz transmission bandwidth, arranged from low to high in the frequency domain. That is, when the third 80 MHz subchannel in the 480 MHz transmission bandwidth is arranged from low to high in the frequency domain, Schemes 2E and 2F are the PAPR-optimal schemes.

[0278] In some embodiments, the transmission bandwidth is obtained by puncturing a third bandwidth, for example, a 640MHz bandwidth is punctured into a 160MHz subchannel to form a 480MHz transmission bandwidth, or a 640MHz bandwidth is punctured into two 80MHz subchannels to form a 480MHz transmission bandwidth.

[0279] In some embodiments, the transmission bandwidth is obtained by unilaterally punching on the third bandwidth, for example, punching the 160MHz sub-channel with the lowest frequency domain on the 640MHz bandwidth, or punching the 160MHz sub-channel with the highest frequency domain on the 640MHz bandwidth, to form a transmission bandwidth of 480MHz.

[0280] In some embodiments, the transmission bandwidth is obtained by symmetrically punching holes on both sides of the center frequency point of the third bandwidth.

[0281] Based on the fact that the 640 MHz transmission bandwidth is obtained by puncturing the third bandwidth, a phase rotation scheme that optimizes the PAPR is proposed below.

[0282] Option 2G:

[0283]

[0284] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0285] The second phase rotation sequence is [1 1 1 1 -1 -1], where the first value "1" is applied to the first 80 MHz subchannel, the second value "1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "-1" is applied to the fifth 80 MHz subchannel, and the sixth value "-1" is applied to the sixth 80 MHz subchannel.

[0286] Based on the first phase rotation sequence and the second phase rotation sequence, the target phase rotation sequence is [1 -1 -1 -1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0287] When the 480 MHz transmission bandwidth is obtained by puncturing the third bandwidth, Solution 2G can achieve a better PAPR. That is, when the target phase rotation sequence in Solution 2G is applied, the PAPR during PPDU transmission is low, resulting in better transmission efficiency and stability of the Wi-Fi system.

[0288] When the transmission bandwidth is 640MHz:

[0289] Taking a first bandwidth of 20 MHz and a second bandwidth of 80 MHz as an example, the fields in the PPDU that are replicated and transmitted in 20 MHz units are generated based on a target phase rotation sequence, which is derived based on a first phase rotation sequence and a second phase rotation sequence. The first phase rotation sequence is a phase rotation sequence applied in 20 MHz units, and the second phase rotation sequence is a phase rotation sequence applied in 80 MHz units. The second bandwidth is 22 times, or 4 times, the first bandwidth, and the transmission bandwidth is 8 times the second bandwidth.

[0290] The field in the PPDU that is duplicated and transmitted every 20 MHz may be a pre-UHR modulation field in a UHR PPDU or a field in a non-HT duplicate transmission PPDU. The pre-UHR modulation field includes at least one of the L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, the U-SIG field, and the UHR-SIG field. The field in the non-HT duplicate transmission PPDU includes at least one of the L-STF field, the L-LTF field, the L-SIG field, and the data field.

[0291] The phase rotation values ​​in the first phase rotation sequence can be any value among 1, -1, j, and -j. For example, the first phase rotation sequence is determined based on the phase rotation values ​​defined for the 80 MHz band in the 802.11ax system and is [1 -1 -1 -1], where "1" is applied to the first 20 MHz subchannel, and the three "-1"s are applied to the second, third, and fourth 20 MHz subchannels, respectively.

[0292] The phase rotation value in the second phase rotation sequence can be any value among 1, -1, j, and -j.

[0293] The phase rotation value in the target phase rotation sequence can be any value among 1, -1, j, and -j.

[0294] This application is schematically illustrated by taking as an example that the phase rotation value in the first phase rotation sequence is 1 or -1, the phase rotation value in the second phase rotation sequence is 1 or -1, and the phase rotation value in the target phase rotation sequence is 1 or -1.

[0295] When the transmission bandwidth is 640 MHz, the subcarrier index k in the transmission bandwidth belongs to a closed interval between -1024 and 1023, that is, k∈[-1024,1023]. The target phase rotation sequence is related to the phase rotation value corresponding to each 80 MHz frequency domain subblock. The phase rotation value in the target phase rotation sequence includes at least one of the following:

[0296] When k is less than -960, the phase rotation value is

[0297] When k is greater than or equal to -960 and k is less than -768, the phase rotation value is

[0298] When k is greater than or equal to -768 and k is less than -704, the phase rotation value is

[0299] When k is greater than or equal to -704 and k is less than -512, the phase rotation value is

[0300] When k is greater than or equal to -512 and k is less than -448, the phase rotation value is

[0301] When k is greater than or equal to -448 and k is less than -256, the phase rotation value is

[0302] When k is greater than or equal to -256 and k is less than -192, the phase rotation value is

[0303] When k is greater than or equal to -192 and k is less than 0, the phase rotation value is

[0304] When k is greater than or equal to 0 and k is less than 64, the phase rotation value is

[0305] When k is greater than or equal to 64 and k is less than 256, the phase rotation value is

[0306] When k is greater than or equal to 256 and k is less than 320, the phase rotation value is

[0307] When k is greater than or equal to 320 and k is less than 512, the phase rotation value is

[0308] When k is greater than or equal to 512 and k is less than 576, the phase rotation value is

[0309] When k is greater than or equal to 576 and k is less than 768, the phase rotation value is

[0310] When k is greater than or equal to 768 and k is less than 832, the phase rotation value is

[0311] When k is greater than or equal to 832, the phase rotation value is

[0312] in, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, and -j. and The values ​​can be the same or different.

[0313] That is to say,

[0314]

[0315] In some embodiments, The value of is non-periodic.

[0316] Transmission bandwidth has the following two forms:

[0317] 1. Transmission bandwidth is non-punctured bandwidth

[0318] In other words, there are no punctured subchannels in the transmission bandwidth. Alternatively, there are no empty channels in the transmission bandwidth. Alternatively, when transmitting a PPDU, all subchannels in the transmission bandwidth are used to transmit the PPDU.

[0319] Based on the 640MHz transmission bandwidth being non-punctured, the following proposes several phase rotation schemes that achieve optimal PAPR. These schemes are based on comparing the PAPR obtained by applying each target rotation sequence to the 640MHz transmission bandwidth in a non-punctured form.

[0320] Option 3A: That is,

[0321]

[0322] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0323] The second phase rotation sequence is [1 -1 1 1 1 1 -1 -1]. The first value "1" is applied to the first 80 MHz subchannel, the second value "-1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, the sixth value "1" is applied to the sixth 80 MHz subchannel, the seventh value "-1" is applied to the seventh 80 MHz subchannel, and the eighth value "-1" is applied to the eighth 80 MHz subchannel.

[0324] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [1 -1 -1 -1 -1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0325] Option 3B: That is,

[0326]

[0327] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0328] The second phase rotation sequence is [-1 -1 1 1 1 1 -1 1]. The first value "-1" is applied to the first 80 MHz subchannel, the second value "-1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, the sixth value "1" is applied to the sixth 80 MHz subchannel, the seventh value "-1" is applied to the seventh 80 MHz subchannel, and the eighth value "1" is applied to the eighth 80 MHz subchannel.

[0329] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1 -1 -1 -1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0330] 2. Transmission bandwidth is the perforation bandwidth

[0331] In other words, some subchannels in the transmission bandwidth are punctured. Alternatively, some subchannels in the transmission bandwidth are left empty. Alternatively, when transmitting a PPDU, some subchannels in the transmission bandwidth are skipped or not used to transmit the PPDU.

[0332] Taking the 640 MHz transmission bandwidth with a puncture granularity of 80 MHz as an example, there are three puncturing methods:

[0333] Method 1): Puncturing an 80 MHz subchannel within the 640 MHz transmission bandwidth creates a 7×996-tone MRU. This method has eight puncturing patterns, and 7×996-tone MRU 1 to 8 represent the bandwidths obtained under each of the eight puncturing patterns.

[0334] Method 2): Puncturing two 80 MHz subchannels within the 640 MHz transmission bandwidth creates a 6×996-tone MRU. This method has four puncturing patterns, and 4×996-tone MRU 1 to 4 represent the bandwidths obtained under each of these puncturing patterns.

[0335] Method 3): Three 80 MHz sub-channels are punctured in the 640 MHz transmission bandwidth to form a 5×996-tone MRU. This method has 12 puncturing patterns, and 5×996-tone MRU 1 to 12 can be used to represent the bandwidth obtained under the 12 puncturing patterns.

[0336] Therefore, there are 24 puncturing patterns in the 640 MHz transmission bandwidth.

[0337] Given that the 640 MHz transmission bandwidth is a punctured bandwidth, the following phase rotation schemes are proposed to achieve optimal PAPR. These schemes are based on comparing the PAPR obtained by applying each target rotation sequence to the 640 MHz transmission bandwidth under the 24 puncturing patterns described above.

[0338] Option 3C: That is,

[0339]

[0340] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0341] The second phase rotation sequence is [-1 1 1 1 1 1 1 -1]. The first value "-1" is applied to the first 80 MHz subchannel, the second value "1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, the sixth value "1" is applied to the sixth 80 MHz subchannel, the seventh value "1" is applied to the seventh 80 MHz subchannel, and the eighth value "-1" is applied to the eighth 80 MHz subchannel.

[0342] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0343] In some embodiments, the third target subchannel is composed of the first 160 MHz subchannel in the 640 MHz transmission bandwidth, which is arranged in ascending order in the frequency domain, and the sixth 80 MHz subchannel in the transmission bandwidth, which is arranged in ascending order in the frequency domain excluding the first 160 MHz subchannel. That is, when the first 160 MHz subchannel in the 640 MHz transmission bandwidth, which is arranged in ascending order in the frequency domain through puncturing, and the sixth 80 MHz subchannel in the transmission bandwidth, which is arranged in ascending order in the frequency domain excluding the first 160 MHz subchannel, are punctured, solution 3C is a solution with a better PAPR.

[0344] Plan 3D: That is,

[0345]

[0346] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0347] The second phase rotation sequence is [-1 1 1 1 1 1 -1 -1]. The first value "-1" is applied to the first 80 MHz subchannel, the second value "1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, the sixth value "1" is applied to the sixth 80 MHz subchannel, the seventh value "-1" is applied to the seventh 80 MHz subchannel, and the eighth value "-1" is applied to the eighth 80 MHz subchannel.

[0348] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0349] In some embodiments, the fourth target subchannel is composed of the fourth 160 MHz subchannel in the 640 MHz transmission bandwidth, which is arranged in ascending order in the frequency domain, and the first 80 MHz subchannel in the transmission bandwidth, which is arranged in ascending order in the frequency domain, excluding the fourth 160 MHz subchannel. That is, when the fourth 160 MHz subchannel in the 640 MHz transmission bandwidth, which is arranged in ascending order in the frequency domain, and the first 80 MHz subchannel in the transmission bandwidth, which is arranged in ascending order in the frequency domain, excluding the fourth 160 MHz subchannel, are punctured, solution 3D is a solution with a relatively high PAPR.

[0350] Option 3E: That is,

[0351]

[0352] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0353] The second phase rotation sequence is [-1 -1 1 1 1 1 1 -1]. The first value "-1" is applied to the first 80 MHz subchannel, the second value "-1" is applied to the second 80 MHz subchannel, the third value "1" is applied to the third 80 MHz subchannel, the fourth value "1" is applied to the fourth 80 MHz subchannel, the fifth value "1" is applied to the fifth 80 MHz subchannel, the sixth value "1" is applied to the sixth 80 MHz subchannel, the seventh value "1" is applied to the seventh 80 MHz subchannel, and the eighth value "-1" is applied to the eighth 80 MHz subchannel.

[0354] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [-1 1 1 1 1 1 1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0355] The PAPRs corresponding to schemes 3A to 3E are shown in Table 4 below.

[0356] Table 4: PAPR of different phase rotation schemes under 640MHz transmission bandwidth

[0357]

[0358] Among them, the control group scheme 3 used The control group scheme 3 is a target rotation sequence randomly selected from all target rotation sequences corresponding to the transmission bandwidth of 640 MHz.

[0359] When the 640 MHz transmission bandwidth is a non-punctured bandwidth or a punctured bandwidth, the PAPR corresponding to Scheme 3A or Scheme 3B makes the PAPR better. This is because, compared with the control group, the target phase rotation sequence applied in Scheme 3 has periodic phase rotation values ​​( The target phase rotation sequence applied in Scheme 3A or Scheme 3B makes the phase rotation value of each 80 MHz frequency domain sub-block in the transmission bandwidth appear non-periodically, resulting in a lower PAPR and better transmission efficiency and stability of the Wi-Fi system.

[0360] In addition, when the 640 MHz transmission bandwidth is the puncturing bandwidth, the PAPR corresponding to schemes 3C to 3E also makes the PAPR better, but compared with schemes 3A or 3B, the PAPR increases by approximately 0.27 dB. Table 4 only lists the PAPR corresponding to the L-STF field and the L-LTF field. If all fields in the PPDU that are replicated and transmitted in units of the first bandwidth are comprehensively considered (such as all pre-UHR modulation fields and all fields in the non-HT replicated transmission PPDU), schemes 3C to 3E are also better PAPR phase rotation sequences.

[0361] In some embodiments, when the 640 MHz transmission bandwidth is a punctured bandwidth and a seventh target subchannel is punctured within the transmission bandwidth, Scheme 3E can achieve a lower worst-case PAPR. The seventh target subchannel is composed of the first 160 MHz subchannel in the 640 MHz transmission bandwidth, arranged in ascending order in frequency domain, and the sixth 80 MHz subchannel in the transmission bandwidth, arranged in ascending order in frequency domain, excluding the first 160 MHz subchannel. That is, when the first 160 MHz subchannel in the 640 MHz transmission bandwidth, arranged in ascending order in frequency domain, and the sixth 80 MHz subchannel in the transmission bandwidth, arranged in ascending order in frequency domain, excluding the first 160 MHz subchannel, are punctured in ascending order in frequency domain, then Scheme 3E is a better PAPR scheme.

[0362] Taking a first bandwidth of 20 MHz and a second bandwidth of 160 MHz as an example, the fields in the PPDU that are replicated and transmitted in 20 MHz units are generated based on a target phase rotation sequence, which is derived based on a first phase rotation sequence and a second phase rotation sequence. The first phase rotation sequence is a phase rotation sequence applied in 20 MHz units, and the second phase rotation sequence is a phase rotation sequence applied in 160 MHz units. The second bandwidth is 23 times, or 8 times, the first bandwidth, and the transmission bandwidth is 4 times the second bandwidth.

[0363] The field in the PPDU that is duplicated and transmitted every 20 MHz may be a pre-UHR modulation field in a UHR PPDU or a field in a non-HT duplicate transmission PPDU. The pre-UHR modulation field includes at least one of the L-STF field, the L-LTF field, the L-SIG field, the RL-SIG field, the U-SIG field, and the UHR-SIG field. The field in the non-HT duplicate transmission PPDU includes at least one of the L-STF field, the L-LTF field, the L-SIG field, and the data field.

[0364] The phase rotation values ​​in the first phase rotation sequence can be any value among 1, -1, j, and -j. For example, the first phase rotation sequence is determined based on the phase rotation values ​​defined for the 80 MHz band in the 802.11ax system and is [1 -1 -1 -1], where "1" is applied to the first 20 MHz subchannel, and the three "-1"s are applied to the second, third, and fourth 20 MHz subchannels, respectively.

[0365] The phase rotation value in the second phase rotation sequence can be any value among 1, -1, j, and -j.

[0366] The phase rotation value in the target phase rotation sequence can be any value among 1, -1, j, and -j.

[0367] This application is schematically illustrated by taking as an example that the phase rotation value in the first phase rotation sequence is 1 or -1, the phase rotation value in the second phase rotation sequence is 1 or -1, and the phase rotation value in the target phase rotation sequence is 1 or -1.

[0368] When the transmission bandwidth is 640 MHz, the subcarrier index k in the transmission bandwidth belongs to a closed interval between -1024 and 1023, that is, k∈[-1024,1023]. The target phase rotation sequence is related to the phase rotation value corresponding to each 160 MHz frequency domain subblock. The phase rotation value in the target phase rotation sequence includes at least one of the following:

[0369] When k is less than -896, the phase rotation value is

[0370] When k is greater than or equal to -896 and k is less than -512, the phase rotation value is

[0371] When k is greater than or equal to -512 and k is less than -384, the phase rotation value is

[0372] When k is greater than or equal to -384 and k is less than 0, the phase rotation value is

[0373] When k is greater than or equal to 0 and k is less than 128, the phase rotation value is

[0374] When k is greater than or equal to 128 and k is less than 512, the phase rotation value is

[0375] When k is greater than or equal to 512 and k is less than 640, the phase rotation value is

[0376] When k is greater than or equal to 640, the phase rotation value is

[0377] in, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, -j, The value of is at least one of 1, -1, j, and -j.

[0378] That is to say,

[0379]

[0380] Based on a 640MHz transmission bandwidth and the correlation between the target phase rotation sequence and the phase rotation value corresponding to each 160MHz frequency sub-block, a phase rotation scheme with optimal PAPR is proposed below. This scheme compares the PAPRs obtained when each target rotation sequence is applied to a 640MHz transmission bandwidth and the target phase rotation sequence is correlated with the phase rotation value corresponding to each 160MHz frequency sub-block, and the optimal phase rotation scheme is selected.

[0381] Plan 3H: That is,

[0382]

[0383] In this scheme, the first phase rotation sequence is [1 -1 -1 -1].

[0384] The second phase rotation sequence is [1 1 1 -1], where the first value "1" is applied to the first 160 MHz subchannel, the second value "1" is applied to the second 160 MHz subchannel, the third value "1" is applied to the third 160 MHz subchannel, and the fourth value "-1" is applied to the fourth 160 MHz subchannel.

[0385] Based on the first phase rotation sequence and the second phase rotation sequence, it can be obtained that the target phase rotation sequence is [1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1-1 1-1 1 1-1 1 1]. The correspondence between the phase rotation values ​​in the target phase rotation sequence and the subchannels and subcarriers is similar to that in solution 1A and is not repeated here.

[0386] When the transmission bandwidth is 640 MHz and the target phase rotation sequence is related to the phase rotation value corresponding to each 160 MHz frequency domain sub-block, the PAPR corresponding to Scheme 3H results in a better PAPR, that is, a lower PAPR, which improves the transmission efficiency and stability of the Wi-Fi system.

[0387] The phase rotation values ​​in the first phase rotation sequence, the second phase rotation sequence, and the target phase rotation sequence proposed above can be multiplied by the same value and used (for example, multiplied by 1, -1, j, or -j and used). Alternatively, the order of the phase rotation values ​​can be changed and used (for example, [1 -1 -1 -1 -1 -1 -1] is changed from low frequency to high frequency to [-1 -1 -1 -1 -1 -1 -1]). Alternatively, the order of the phase rotation values ​​can be changed and the phase rotation values ​​can be multiplied by the same value (for example, [1 -1 -1 -1 -1 -1 -1] is changed from low frequency to high frequency, multiplied by -1, and used as [1 1 1 -1 1 1 -1]). In this case, the PAPR corresponding to these phase rotation values ​​is the same.

[0388] FIG11 shows a block diagram of a PPDU transmission device in a Wi-Fi system according to some exemplary embodiments of the present application. The device includes at least some of the following modules: a sending module 1320, a processing module 1340, a puncturing module 1360, and a receiving module 1380.

[0389] The sending module 1320 is configured to send a PPDU in a transmission bandwidth, wherein the PPDU includes a field that is replicated and transmitted in units of a first bandwidth;

[0390] The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0391] In some embodiments, the apparatus includes a processing module 1340 configured to generate the field based on a target phase rotation sequence and / or obtain the target phase rotation sequence based on a first phase rotation sequence and a second phase rotation sequence, wherein the first phase rotation sequence is a phase rotation sequence with the first bandwidth as an application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as an application unit, the second bandwidth is a power of 2 multiple of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0392] In some embodiments, the field includes at least one of the following:

[0393] The pre-UHR modulation field in the UHR PPDU;

[0394] The non-HT duplicates the fields in the transmit PPDU.

[0395] In some embodiments, the pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field;

[0396] The fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a data field.

[0397] In some embodiments, the first bandwidth is a 20 MHz bandwidth.

[0398] In some embodiments, the second bandwidth is an 80 MHz bandwidth or a 160 MHz bandwidth.

[0399] In some embodiments, the transmission bandwidth is a punctured bandwidth or a non-punctured bandwidth.

[0400] In some embodiments, the transmission bandwidth is a punctured bandwidth, and the puncturing granularity of the transmission bandwidth is at least one of the following:

[0401] 20MHz;

[0402] 40MHz;

[0403] 80MHz.

[0404] In some embodiments, the transmission bandwidth is at least one of 240 MHz, 480 MHz, and 640 MHz.

[0405] In some embodiments, the apparatus includes a puncturing module 1360 for puncturing the transmission bandwidth, or for puncturing the transmission bandwidth.

[0406] In some embodiments, the apparatus includes a receiving module 1360 for receiving a PPDU in a transmission bandwidth, the PPDU including a field replicated for transmission in units of a first bandwidth;

[0407] The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

[0408] In summary, the apparatus provided in this embodiment obtains a target phase rotation sequence based on the first phase rotation sequence and the second phase rotation sequence, and generates fields in the PPDU based on the target phase rotation sequence. This facilitates a better PAPR when the PPDU is transmitted within the transmission bandwidth, thereby improving the transmission efficiency and stability of the Wi-Fi system.

[0409] It should be noted that the device provided in the above embodiment is only illustrated by the division of the above functional modules. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0410] Regarding the device in this embodiment, the specific manner in which each module performs operations has been described in detail in the embodiment of the method and will not be elaborated here.

[0411] FIG12 shows a schematic structural diagram of a wireless communication device (AP or STA) provided in some exemplary embodiments of the present application. The wireless communication device 1400 includes: a processor 1401 , a receiver 1402 , a transmitter 1403 , a memory 1404 and a bus 1405 .

[0412] The processor 1401 includes one or more processing cores, and the processor 1401 executes various functional applications and information processing by running software programs and modules. In some embodiments, the processor 1401 can be used to implement the functions and steps of the processing module 1340 and / or the punching module 1360 described above.

[0413] Receiver 1402 and transmitter 1403 can be implemented as a communication component, which can be a communication chip. In some embodiments, receiver 1402 can be used to implement the functions and steps of receiving module 1380 described above. In some embodiments, transmitter 1403 can be used to implement the functions and steps of sending module 1320 described above.

[0414] The memory 1404 is connected to the processor 1401 via a bus 1405. The memory 1404 may be used to store at least one instruction, and the processor 1401 may be used to execute the at least one instruction to implement each step in the above method embodiment.

[0415] In addition, the memory 1404 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, electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), static random-access memory (SRAM), read-only memory (ROM), magnetic memory, flash memory, and programmable read-only memory (PROM).

[0416] In some embodiments, the receiver 1402 receives signals / data independently, or the processor 1401 controls the receiver 1402 to receive signals / data, or the processor 1401 requests the receiver 1402 to receive signals / data, or the processor 1401 cooperates with the receiver 1402 to receive signals / data.

[0417] In some embodiments, the transmitter 1403 independently sends signals / data, or the processor 1401 controls the transmitter 1403 to send signals / data, or the processor 1401 requests the transmitter 1403 to send signals / data, or the processor 1401 cooperates with the transmitter 1403 to send signals / data.

[0418] In an exemplary embodiment of the present application, a computer-readable storage medium is further provided. The computer-readable storage medium stores at least one program, which is loaded and executed by a processor to implement the PPDU transmission method in a Wi-Fi system provided by each of the above method embodiments.

[0419] In an exemplary embodiment of the present application, a chip is further provided. The chip includes a programmable logic circuit and / or program instructions. When the chip is executed on a communication device, it is used to implement the PPDU transmission method in a Wi-Fi system provided by each of the above method embodiments.

[0420] In an exemplary embodiment of the present application, a computer program product is further provided. When the computer program product is executed on a processor of a computer device, the computer device executes the above-mentioned PPDU transmission method in a Wi-Fi system.

[0421] In an exemplary embodiment of the present application, a computer program is further provided. The computer program includes computer instructions. A processor of a computer device executes the computer instructions, so that the computer device executes the above-mentioned PPDU transmission method in a Wi-Fi system.

[0422] Those skilled in the art will appreciate that in one or more of the above examples, the functions described in the embodiments of the present application can be implemented using hardware, software, firmware, or any combination thereof. When implemented using software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or codes on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any media that facilitates the transmission of computer programs from one place to another. The storage medium can be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0423] The above description is merely an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application shall be included in the scope of protection of the present application.

Claims

1. A PPDU transmission method in a Wi-Fi system, characterized in that: The method comprises: Sending a physical layer protocol data unit (PPDU) in a transmission bandwidth, wherein the PPDU includes a field that is replicated and transmitted in units of a first bandwidth; The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

2. The method according to claim 1, characterized in that The fields include at least one of the following: The pre-UHR modulation field in the ultra-high reliability UHR PPDU; Non-HT duplicates the fields in the transmitted PPDU.

3. The method according to claim 2, characterized in that The pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field; The fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a data field.

4. The method according to any one of claims 1 to 3, characterized in that: The first bandwidth is 20 MHz.

5. The method according to any one of claims 1 to 4, characterized in that: The second bandwidth is 80 MHz bandwidth or 160 MHz bandwidth.

6. The method according to any one of claims 1 to 5, characterized in that: The transmission bandwidth is a punctured bandwidth or a non-punctured bandwidth.

7. The method according to claim 6, characterized in that The transmission bandwidth is a punctured bandwidth, and the puncturing granularity of the transmission bandwidth is at least one of the following: 20MHz; 40MHz; 80MHz.

8. The method according to claim 6 or 7, characterized in that The transmission bandwidth is at least one of 240 MHz, 480 MHz, and 640 MHz.

9. The method according to claim 8, characterized in that When the transmission bandwidth is 240 MHz, the index k of the subcarrier in the transmission bandwidth belongs to a closed interval of -384 to 383; The phase rotation value in the target phase rotation sequence includes at least one of the following: When k is less than -320, the phase rotation value is When k is greater than or equal to -320 and k is less than -128, the phase rotation value is When k is greater than or equal to -128 and k is less than -64, the phase rotation value is When k is greater than or equal to -64 and k is less than 128, the phase rotation value is When k is greater than or equal to 128 and k is less than 192, the phase rotation value is When k is greater than or equal to 192, the phase rotation value is in, The value of is at least one of 1, -1, j, and -j.

10. The method according to claim 9, characterized in that or, or, or, 11. The method according to claim 9 or 10, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: A 20 MHz sub-channel is punctured in the transmission bandwidth, or a 40 MHz sub-channel is punctured in the transmission bandwidth.

12. The method according to any one of claims 9 to 11, characterized in that: The transmission bandwidth is a puncturing bandwidth, and the method further includes: A first target subchannel is punctured in the transmission bandwidth, where the first target subchannel is the eighth 20 MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth.

13. The method according to claim 8, characterized in that When the transmission bandwidth is 480 MHz, the index k of the subcarrier in the transmission bandwidth belongs to a closed interval of -768 to 767; The phase rotation value in the target phase rotation sequence includes at least one of the following: When k is less than -704, the phase rotation value is 1; When k is greater than or equal to -704 and k is less than -512, the phase rotation value is -1; When k is greater than or equal to -512 and k is less than -448, the phase rotation value is 1; When k is greater than or equal to -448 and k is less than -256, the phase rotation value is -1; When k is greater than or equal to -256 and k is less than -192, the phase rotation value is 1; When k is greater than or equal to -192 and k is less than 0, the phase rotation value is -1; When k is greater than or equal to 0 and k is less than 64, the phase rotation value is 1; When k is greater than or equal to 64 and k is less than 256, the phase rotation value is -1; When k is greater than or equal to 256 and k is less than 320, the phase rotation value is -1; When k is greater than or equal to 320 and k is less than 512, the phase rotation value is 1; When k is greater than or equal to 512 and k is less than 576, the phase rotation value is -1; When k is greater than or equal to 576, the phase rotation value is 1.

14. The method according to claim 8, characterized in that When the transmission bandwidth is 480 MHz, the index k of the subcarrier in the transmission bandwidth belongs to a closed interval of -768 to 767; The phase rotation value in the target phase rotation sequence includes at least one of the following: When k is less than -704, the phase rotation value is When k is greater than or equal to -704 and k is less than -512, the phase rotation value is When k is greater than or equal to -512 and k is less than -448, the phase rotation value is When k is greater than or equal to -448 and k is less than -256, the phase rotation value is When k is greater than or equal to -256 and k is less than -192, the phase rotation value is When k is greater than or equal to -192 and k is less than 0, the phase rotation value is When k is greater than or equal to 0 and k is less than 64, the phase rotation value is When k is greater than or equal to 64 and k is less than 256, the phase rotation value is When k is greater than or equal to 256 and k is less than 320, the phase rotation value is When k is greater than or equal to 320 and k is less than 512, the phase rotation value is When k is greater than or equal to 512 and k is less than 576, the phase rotation value is When k is greater than or equal to 576, the phase rotation value is in, The value of is at least one of 1, -1, j, and -j.

15. The method according to claim 14, characterized in that described The value of is non-periodic.

16. The method according to claim 14 or 15, characterized in that or, or, or, 17. The method according to claim 14 or 15, characterized in that or, 18. The method according to claim 17, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: A 40 MHz sub-channel is punctured in the transmission bandwidth, or an 80 MHz sub-channel is punctured in the transmission bandwidth, or an 80 MHz sub-channel and a 40 MHz sub-channel are punctured in the transmission bandwidth.

19. The method according to claim 17 or 18, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: A second target sub-channel is punctured in the transmission bandwidth, where the second target sub-channel is the third 80 MHz sub-channel arranged from low to high in the frequency domain in the transmission bandwidth.

20. The method according to claim 8, characterized in that When the transmission bandwidth is 640 MHz, the index k of the subcarrier in the transmission bandwidth belongs to a closed interval of -1024 to 1023; The phase rotation value in the target phase rotation sequence includes at least one of the following: When k is less than -960, the phase rotation value is When k is greater than or equal to -960 and k is less than -768, the phase rotation value is When k is greater than or equal to -768 and k is less than -704, the phase rotation value is When k is greater than or equal to -704 and k is less than -512, the phase rotation value is When k is greater than or equal to -512 and k is less than -448, the phase rotation value is When k is greater than or equal to -448 and k is less than -256, the phase rotation value is When k is greater than or equal to -256 and k is less than -192, the phase rotation value is When k is greater than or equal to -192 and k is less than 0, the phase rotation value is When k is greater than or equal to 0 and k is less than 64, the phase rotation value is When k is greater than or equal to 64 and k is less than 256, the phase rotation value is When k is greater than or equal to 256 and k is less than 320, the phase rotation value is When k is greater than or equal to 320 and k is less than 512, the phase rotation value is When k is greater than or equal to 512 and k is less than 576, the phase rotation value is When k is greater than or equal to 576 and k is less than 768, the phase rotation value is When k is greater than or equal to 768 and k is less than 832, the phase rotation value is When k is greater than or equal to 832, the phase rotation value is in, The value of is at least one of 1, -1, j, and -j.

21. The method according to claim 20, characterized in that described The value of is non-periodic.

22. The method according to claim 20 or 21, characterized in that or, 23. The method according to claim 20 or 21, characterized in that 24. The method according to claim 20 or 21, characterized in that 25. The method according to claim 20 or 21, characterized in that 26. The method according to any one of claims 23 to 25, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: One 80 MHz sub-channel is punctured in the transmission bandwidth, or two 80 MHz sub-channels are punctured in the transmission bandwidth, or three 80 MHz sub-channels are punctured in the transmission bandwidth.

27. The method according to claim 23 or 26, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: A third target subchannel is punched in the transmission bandwidth, wherein the third target subchannel is composed of the first 160MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth, and the sixth 80MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth except the first 160MHz subchannel.

28. The method according to claim 24 or 26, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: A fourth target subchannel is punched in the transmission bandwidth, wherein the fourth target subchannel is composed of the fourth 160MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth, and the first 80MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth except the fourth 160MHz subchannel.

29. The method according to claim 25 or 26, characterized in that The transmission bandwidth is a puncturing bandwidth, and the method further includes: A seventh target subchannel is punched in the transmission bandwidth, wherein the seventh target subchannel is composed of the first 160MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth, and the sixth 80MHz subchannel arranged from low to high in the frequency domain in the transmission bandwidth except the first 160MHz subchannel.

30. The method according to claim 8, wherein When the transmission bandwidth is 640 MHz, the index k of the subcarrier in the transmission bandwidth belongs to a closed interval of -1024 to 1023; The phase rotation value in the target phase rotation sequence includes at least one of the following: When k is less than -896, the phase rotation value is When k is greater than or equal to -896 and k is less than -512, the phase rotation value is When k is greater than or equal to -512 and k is less than -384, the phase rotation value is When k is greater than or equal to -384 and k is less than 0, the phase rotation value is When k is greater than or equal to 0 and k is less than 128, the phase rotation value is When k is greater than or equal to 128 and k is less than 512, the phase rotation value is When k is greater than or equal to 512 and k is less than 640, the phase rotation value is When k is greater than or equal to 640, the phase rotation value is in, The value of is at least one of 1, -1, j, and -j.

31. The method according to claim 30, characterized in that 32. The method according to any one of claims 1 to 31, characterized in that The transmission bandwidth is obtained by puncturing the third bandwidth.

33. The method according to claim 32, characterized in that The transmission bandwidth is obtained by unilaterally punching holes in the third bandwidth; Alternatively, the transmission bandwidth is obtained by symmetrically punching holes on both sides of the center frequency point of the third bandwidth.

34. A PPDU transmission method in a Wi-Fi system, characterized in that: The method comprises: receiving a physical layer protocol data unit (PPDU) in a transmission bandwidth, the PPDU including a field replicated and transmitted in units of a first bandwidth; The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

35. The method according to claim 34, wherein The fields include at least one of the following: The pre-UHR modulation field in the ultra-high reliability UHR PPDU; Non-HT duplicates the fields in the transmitted PPDU.

36. The method according to claim 35, characterized in that The pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field; The fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a data field.

37. The method according to any one of claims 34 to 36, characterized in that The first bandwidth is 20 MHz.

38. The method according to any one of claims 34 to 37, characterized in that The second bandwidth is 80 MHz bandwidth or 160 MHz bandwidth.

39. The method according to any one of claims 34 to 38, characterized in that The transmission bandwidth is a punctured bandwidth or a non-punctured bandwidth.

40. The method according to claim 39, wherein The transmission bandwidth is a punctured bandwidth, and the puncturing granularity of the transmission bandwidth is at least one of the following: 20MHz; 40MHz; 80MHz.

41. The method according to claim 39 or 40, characterized in that The transmission bandwidth is at least one of 240 MHz, 480 MHz, and 640 MHz.

42. A PPDU transmission device in a Wi-Fi system, characterized in that: The device comprises: a sending module, configured to send a physical layer protocol data unit (PPDU) in a transmission bandwidth, wherein the PPDU includes a field that is replicated and transmitted in units of a first bandwidth; The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

43. The device according to claim 42, characterized in that The fields include at least one of the following: The pre-UHR modulation field in the ultra-high reliability UHR PPDU; Non-HT duplicates the fields in the transmitted PPDU.

44. The device according to claim 43, characterized in that The pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field; The fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a data field.

45. The device according to any one of claims 42 to 44, characterized in that The first bandwidth is 20 MHz.

46. ​​The device according to any one of claims 42 to 45, characterized in that The second bandwidth is 80 MHz bandwidth or 160 MHz bandwidth.

47. The device according to any one of claims 42 to 46, characterized in that The transmission bandwidth is a punctured bandwidth or a non-punctured bandwidth.

48. The device according to claim 47, characterized in that The transmission bandwidth is a punctured bandwidth, and the puncturing granularity of the transmission bandwidth is at least one of the following: 20MHz; 40MHz; 80MHz.

49. The device according to claim 47 or 48, characterized in that The transmission bandwidth is at least one of 240 MHz, 480 MHz, and 640 MHz.

50. A PPDU transmission device in a Wi-Fi system, characterized in that: The device comprises: a receiving module, configured to receive a physical layer protocol data unit (PPDU) in a transmission bandwidth, wherein the PPDU includes a field that is replicated and transmitted in units of a first bandwidth; The field is generated based on a target phase rotation sequence, the target phase rotation sequence is obtained based on a first phase rotation sequence and a second phase rotation sequence, the first phase rotation sequence is a phase rotation sequence with the first bandwidth as the application unit, the second phase rotation sequence is a phase rotation sequence with the second bandwidth as the application unit, the second bandwidth is a power of 2 of the first bandwidth, and the transmission bandwidth is a positive integer multiple of the second bandwidth.

51. The device according to claim 50, characterized in that The fields include at least one of the following: The pre-UHR modulation field in the ultra-high reliability UHR PPDU; Non-HT duplicates the fields in the transmitted PPDU.

52. The device according to claim 51, characterized in that The pre-UHR modulation field includes at least one of an L-STF field, an L-LTF field, an L-SIG field, an RL-SIG field, a U-SIG field, and a UHR-SIG field; The fields in the non-HT duplicate transmission PPDU include at least one of an L-STF field, an L-LTF field, an L-SIG field, and a data field.

53. The device according to any one of claims 50 to 52, characterized in that The first bandwidth is 20 MHz.

54. The device according to any one of claims 50 to 53, characterized in that The second bandwidth is 80 MHz bandwidth or 160 MHz bandwidth.

55. The device according to any one of claims 50 to 54, characterized in that The transmission bandwidth is a punctured bandwidth or a non-punctured bandwidth.

56. The device according to claim 55, characterized in that The transmission bandwidth is a punctured bandwidth, and the puncturing granularity of the transmission bandwidth is at least one of the following: 20MHz; 40MHz; 80MHz.

57. The device according to claim 55 or 56, characterized in that The transmission bandwidth is at least one of 240 MHz, 480 MHz, and 640 MHz.

58. A wireless communication device, characterized in that The wireless communication device comprises: processor; a transceiver connected to the processor; a memory for storing executable instructions for the processor; The processor is configured to load and execute the executable instructions to implement the PPDU transmission method in a Wi-Fi system according to any one of claims 1 to 33 or claims 34 to 41.

59. A computer-readable storage medium, characterized in that The readable storage medium stores executable instructions, and the executable instructions are loaded and executed by the processor to implement the PPDU transmission method in the Wi-Fi system according to any one of claims 1 to 33 or claims 34 to 41.

60. A chip, characterized in that: The chip includes a programmable logic circuit or a program, and the chip is used to implement the PPDU transmission method in the Wi-Fi system according to any one of claims 1 to 33 or claims 34 to 41.

61. A computer program product, characterized in that The computer program product includes computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the PPDU transmission method in a Wi-Fi system according to any one of claims 1 to 33 or claims 34 to 41.

62. A computer program, characterized in that The computer program includes computer instructions, and a processor of a computer device executes the computer instructions, so that the computer device performs the PPDU transmission method in a Wi-Fi system according to any one of claims 1 to 33 or claims 34 to 41.

Images