Communication method and device

Abstract

The invention provides a communication method and a communication device, which support an IEEE (Institute of Electrical and Electronic Engineers) Wi-Fi (Wireless Fidelity) protocol, such as an IEEE 802.11 be / Wi-Fi 7 / EHT protocol, an IEEE 802.11 bn / UHR / Wi-Fi 8 protocol, an IEEE 802.15 / UWB (Ultra Wideband) protocol, or an IEEE 802.11 bf / sensing / sensing protocol and the like. The method comprises: generating and sending a PPDU, the PPDU comprising a first field, the first field being used for bearing a first sequence, the first sequence comprising a sequence on a pilot frequency subcarrier, the sequence on the pilot frequency subcarrier being obtained based on a twiddle factor, the value of the twiddle factor being more than one. By designing the twiddle factor and the value of the twiddle factor, the PAPR of the first sequence is reduced, and the accuracy of channel estimation is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and more specifically, to a communication method and device. Background Art

[0002] With the ultra-high-speed growth of wireless traffic, users have higher and higher demands for communication service quality, such as low latency and ultra-reliability. As a key technology for carrying wireless traffic services, wireless local area network (WLAN) continues to develop and evolve to meet people's increasingly high requirements for wireless transmission.

[0003] Since the 802.11a / g standard, WLAN has gone through the standard evolution process of 802.11n standard, 802.11ac standard, 802.11ax standard and 802.11be standard. Millimeter Wave (mmWave) has become an important direction for future WLAN due to its large bandwidth advantage, but its commercial development is limited by its high cost. Integrated millimeter wave (IMMW) can effectively reduce costs by multiplexing low-frequency baseband processing modules to achieve transmission on high-frequency millimeter waves, so it has received widespread attention. However, in IMMW, when the channel estimation sequence used for low frequency is multiplexed to high-frequency millimeter waves, the peak-to-average power ratio (PAPR) may be too high, which cannot meet the high-frequency power amplifier (PA). Summary of the invention

[0004] The present application provides a communication method and device, which reduces the PAPR of a first sequence by designing a rotation factor and a value of the rotation factor, thereby improving the accuracy of channel estimation.

[0005] In a first aspect, a communication method is provided, which may be executed by a transmitting end or by a component (eg, a chip, a circuit, or a module, etc.) configured in the transmitting end, and is not limited in the present application.

[0006] The method includes: generating a physical layer protocol data unit (PPDU), the PPDU includes a first field, the first field is used to carry a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; sending the PPDU.

[0007] Exemplarily, the transmitting end may be an access point (AP) or a non-access point (non-AP) station (STA). The receiving end may be an AP or a STA, which is not limited in this application. For example, a communication scenario may be: the transmitting end is an AP and the receiving end is an STA; a communication scenario may be: the transmitting end is an STA and the receiving end is an AP; a communication scenario may be: the transmitting end is an STA and the receiving end is an STA; a communication scenario may be: the transmitting end is an AP and the receiving end is an AP.

[0008] Exemplarily, the first sequence may be a long training field (LTF) sequence, the first sequence including a sequence on a pilot subcarrier and a sequence on a non-pilot subcarrier, the sequence on the pilot subcarrier is used by the receiving end to perform phase tracking, solve phase noise (PN) and residual carrier frequency offset (CFO) problems, and the sequence on the non-pilot subcarrier is used by the receiving end to perform channel estimation, for example, to estimate multiple channels during multi-spatial stream transmission.

[0009] It should be noted that the sequence on the pilot subcarrier is obtained based on the rotation factor, including:

[0010] b) The sequence on the pilot subcarrier is generated according to the spatial mapping matrix. It is expressed as:

[0011] And the first sequence uses a single-stream pilot;

[0012] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of orthogonal frequency division multiplexing (OFDM) symbols of the first sequence, α k is a real number.

[0013] The sequence on the pilot subcarrier is obtained based on the rotation factor and also includes:

[0014] Before b) above, including:

[0015] a) Sequence generation: Generate the basic frequency domain LTF sequence corresponding to the bandwidth of the PPDU.

[0016] After b) above, including:

[0017] c) CSD: CSD is applied to each space-time stream and frequency segment.

[0018] d) Spatial mapping: Apply Q matrix.

[0019] e) Discrete Fourier transform (inverse discrete Fourier transform, IDFT): Calculate the inverse discrete Fourier transform.

[0020] f) Guard Interval (GI) and windowing: GI is added in front and windowing is applied.

[0021] g) Analog and radio frequency (RF): The resulting complex baseband waveform associated with each transmit chain is up-converted to an RF signal based on the center frequency of the desired channel and then transmitted.

[0022] That is, the sequence on the pilot subcarrier is obtained based on the rotation factor, including but not limited to the following process:

[0023] a) Sequence generation: Generate the basic frequency domain LTF sequence corresponding to the bandwidth of the PPDU.

[0024] b) AHE-LTF matrix mapping: P LTF The matrix is ​​applied to the non-pilot subcarriers of the first sequence and The matrix is ​​applied to the pilot subcarriers of the first sequence. The subsequent implementation methods mainly focus on the processing of the pilot subcarriers in this link.

[0025] c) CSD: CSD is applied to each space-time stream and frequency segment.

[0026] d) Spatial mapping: Apply Q matrix.

[0027] e) IDFT: Calculates the Inverse Discrete Fourier Transform.

[0028] f) GI and windowing: GI is added in front and windowing is applied.

[0029] g) Analog and RF: The resulting complex baseband waveform associated with each transmit chain is up-converted to an RF signal based on the center frequency of the desired channel and then transmitted.

[0030] It should be noted that the rotation factor The value of the rotation factor is greater than or equal to 2, which means that the value of the rotation factor can be multiple, which means that the pilot phase rotation angle θ k There are more than one possible values, or the pilot phase rotation angle θ k The value of is greater than or equal to 2, indicating that the pilot phase rotation angle θ k The value of can be greater than or equal to 2. For example, when the rotation factor In There are two possible values ​​for the pilot phase rotation angle θ k There are two possible values ​​for , for example, k =0, Or θ k =π, For example, when the rotation factor In There are 6 values ​​of, indicating that the pilot phase rotation angle θ k There are 6 possible values ​​of , for example, k =0, Or θ k =π / 3, Or θ k =2π / 3, Or θ k =π, Or θ k =4π / 3, Or θ k =5π / 3, This application is for k , The value of is not limited.

[0031] Optionally, the technical solution of the present application is applicable to communication scenarios in high frequency bands.

[0032] According to the scheme provided in this application, the rotation factor is designed By extending the pilot phase θ k The value of the pilot phase θ k The value of includes not only 0 and π, and correspondingly, the value of the sequence on the pilot subcarrier in the first sequence also includes not only ±1, but can be extended to This implementation method can reduce the PAPR of the first sequence over the entire bandwidth and improve transmission performance, while also not affecting the effect of the phase tracking performed by the receiving end using the sequence on the pilot subcarrier.

[0033] In combination with the first aspect, in some implementations of the first aspect, the sequence on the pilot subcarrier is obtained based on the rotation factor, including: the sequence on the pilot subcarrier is generated according to the spatial mapping matrix, the spatial mapping matrix It is expressed as:

[0034] And the first sequence uses a single-stream pilot;

[0035] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number, such as α k =1.

[0036] In combination with the first aspect, in some implementations of the first aspect, the first sequence is generated according to a spatial mapping matrix, and the spatial mapping matrix It is expressed as:

[0037]

[0038] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number, such as α k =1. LTF The spatial mapping matrix corresponding to the sequence on the non-pilot subcarriers in the first sequence is represented.

[0039] It should be understood that in the WiFi protocol, P is usually used. LTF The elements of the matrix are multiplied by the first sequence to maintain the orthogonal transmission of each spatial stream so that the receiving end can obtain accurate channel estimation results. The columns correspond to multiple OFDM symbols, and the rows correspond to multiple spatial streams. In the WIFI protocol, each OFDM symbol generally contains pilot subcarriers and data subcarriers. The pilot subcarrier is a subcarrier with a preset sequence in an OFDM symbol, and the data subcarrier is a subcarrier for transmitting data. In the communication system, the pilot subcarrier is generally used to help detect and correct the subcarrier phase offset, thereby improving the accuracy of data subcarrier resolution.

[0040] Based on the above scheme, by mapping the matrix in space Added rotation factors And the value of the rotation factor is expanded so that the pilot phase includes not only 0 and π, and the sequence on the pilot subcarrier includes not only ±1, which can improve the PAPR performance of the first sequence, thereby allowing the transmitted signal to have higher power when passing through the PA, thereby improving the accuracy of channel estimation.

[0041] In conjunction with the first aspect, in some implementations of the first aspect, θ k The value of is any of the following: {0,3}×π / 3; or, θ k The value of is any of the following: {0,1,2,3,4,5}×π / 3; or, θ k The value of is any of the following: {0,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5}×π / 3.

[0042] It should be understood that the present application uses the pilot phase rotation angle θ k Based on the above scheme, by designing multiple pilot phases θ k In other words, by designing the values ​​of multiple rotation factors, the corresponding values ​​of the sequences on the multiple pilot subcarriers are obtained to reduce the PAPR of the first sequence over the entire bandwidth, improve the problem of excessive PAPR when the low-frequency first sequence is multiplexed to the high-frequency millimeter wave, and ensure the system transmission performance.

[0043] It should be understood that the LTF sequence can be divided into 1x sequence, 2x sequence and 4x sequence according to the number of zero elements between two non-zero elements. Among them, there are 3 zero elements between two non-zero elements of the 1x LTF sequence, 1 zero element between two non-zero elements of the 2x LTF sequence, and the 4x LTF sequence is a continuous non-zero element. Among them, because the non-zero elements in the 4x LTF sequence are the most dense, the channel estimation result obtained by using the 4x LTF sequence for channel estimation is more accurate, and the relevant parts will not be repeated below.

[0044] Exemplarily, the PPDU may be transmitted using a first bandwidth, which is a bandwidth at a high frequency. For example, the first bandwidth may be a bandwidth of 20 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0045] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-28, -27, …, 0, …, 27, 28}, and the position index set of the pilot subcarrier is {-21, -7, 7, 21}, with a total of 4 pilot positions.

[0046] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or {0,0,0,3}×π / 3, or {3,3,3,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3, or {3,3,3,0}×π / 3, and the corresponding PAPR is 5.3426dB.

[0047] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, {0,0,0,3}×π / 3, {3,3,3,0}×π / 3, {1,1,1,4}×π / 3, {4,4,4,1}×π / 3, {5,5,5,2}×π / 3, or {2,2,2,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3, and the corresponding PAPRs are all 5.3426dB.

[0048] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, {0,0,0,3}×π / 3, {3,3,3,0}×π / 3, {1,1,1,4}×π / 3, {4,4,4,1}×π / 3, {5,5,5,2}×π / 3, or {2,2,2,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3, and the corresponding PAPRs are all 5.3426dB.

[0049] It should be noted that for the LTF sequence of the existing 802.11ac 20MHz PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.1904dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.6075dB. In the above three examples, when LTF is transmitted using a single-stream pilot, the pilot phase provided by the present application will not cause an increase in PAPR; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase provided by the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, and ensure low PAPR performance during multi-spatial stream transmission.

[0050] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0051] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, with a total of 8 pilot positions.

[0052] Optionally, the first bandwidth is a bandwidth of 20 MHz after clocking in, and the implementation method is performed for transmission of a 2xLTF sequence of a PPDU.

[0053] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,0,0,0}×π / 3, {0,0,0,0,3,3,0,0}×π / 3, {0,0,0,0,0,0,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0,3,0,0,0}×π / 3, and the corresponding PAPR is 4.3610dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,3,0,0}×π / 3, or, {0,0,0,0,0,0,3,3}×π / 3, and the corresponding PAPR is 5.1933dB.

[0054] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,0,0,0}×π / 3, {3,3,4,4,1,1,3,3}×π / 3, {4,4,5,5,2,2,4,4}×π / 3, {0,0,1,1,4,4,0,0}×π / 3, {2,2,3,3,0,0,2,2}×π / 3, {5,5,0,0,3,3,5,5}×π / 3, {1,1,2,2,5,5,1,1}×π / 3, {4,4,3,3,0,0,4,4}×π / 3, {0,0,5,5,2,2,0,0}×π / 3, {1,1,0,0,3,3,1,1}×π / 3, {2,2,1,1,4,4,2,2}×π / 3, {3,3,2,2,5,5,3,3}×π / 3, or {5,5,4,4,1,1,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0,3,0,0,0}×π / 3, and the corresponding PAPR is 4.3610dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,4,4,1,1,3,3}×π / 3, {4,4,5,5,2,2,4,4}×π / 3, {0,0,1,1,4,4,0,0}×π / 3 , {2,2,3,3,0,0,2,2}×π / 3, {5,5,0,0,3,3,5,5}×π / 3, {1,1,2,2,5,5,1,1}×π / 3, {4,4,3,3,0,0,4,4}×π / 3, {0,0,5,5,2,2,0,0}×π / 3, {1,1,0,0,3,3,1,1}×π / 3, {2,2,1,1,4,4,2,2}×π / 3, {3,3,2,2,5,5,3,3}×π / 3, or {5,5,4,4,1,1,5,5}×π / 3, the corresponding PAPR is 4.9648dB.

[0055] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4.5, 3, 5, 5.5, 0.5, 5.5, 0, 0} × π / 3; or, {1.5, 3, 1, 0.5, 5.5, 0.5, 0, 0} × π / 3, or, {5.5, 0, 0.5, 0.5, 3.5, 3.5, 5.5, 5.5} × π / 3; { 2.5,3,3.5,3.5,0.5,0.5,2.5,2.5}×π / 3; {3.5,4,4.5,4.5,1.5,1.5,3.5,3.5}×π / 3; {4.5,5,5.5,5.5,2.5,2.5,4.5,4.5}×π / 3; {0.5,0,5.5,5.5,2.5,2.5,0.5 ,0.5}×π / 3; {0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3; {1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3; {1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3; {4.5,4,3.5,3.5 ,0.5,0.5,4.5,4.5}×π / 3; {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3; {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3; or, {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4.5, 3, 5, 5.5, 0.5, 5.5, 0, 0} × π / 3; or, {1.5, 3, 1, 0.5, 5.5, 0.5, 0, 0} × π / 3, and the corresponding PAPR is 4.2260 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7, or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {5.5, 0, 0.5, 0.5, 3.5, 3.5, 5.5, 5.5} × π / 3; {2.5, 3, 3.5, 3.5, 0.5, 0.5, 2.5, 2.5} × π / 3; {3.5, 4, 4.5, 4.5, 1.5, 1.5, 3.5, 3.5} × π / 3; {4.5, 5, 5.5, 5.5, 2.5 ,2.5,4.5,4.5}×π / 3;{0.5,0,5.5,5.5,2.5,2.5,0.5,0.5}×π / 3;{0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3;{1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3;{1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3;{ 4.5,4,3.5,3.5,0.5,0.5,4.5,4.5}×π / 3; {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3; {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3; or, {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3, and the corresponding PAPR is 4.9595dB.

[0056] It should be noted that for the 2xLTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.8678dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.2395dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0057] Based on the above scheme, by designing different pilot phase rotation angles θ k, so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0058] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, with a total of 8 pilot positions.

[0059] Optionally, the first bandwidth is the bandwidth of 20 MHz after clocking in, and the implementation method is performed for the transmission of a 4xLTF sequence of the PPDU.

[0060] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,0,0,3,0,0}×π / 3, or {0,3,3,3,3,3,0,0}×π / 3; or {3,0,0,0,0,0,0,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,3,3,0,0,3,0,0}×π / 3, and the corresponding PAPR is 4.5930dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,3,3,3,0,0}×π / 3; or, {3,0,0,0,0,0,3,3}×π / 3, and the corresponding PAPR is 5.3274dB.

[0061] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,2,3,0,0,3,0,0}×π / 3, or, {5,0,1,1,1,1,3,2}×π / 3; {0,1,2,2,2,2,4,3}×π / 3; {2,3,4,4,4,4,0,5}×π / 3; {1,2,3,3,3,3,5,4}×π / 3; {3,4,5,5,5,5,1,0}× π / 3; {4,5,0,0,0,0,2,1}×π / 3; {0,5,4,4,4,4,2,3}×π / 3; {1,0,5,5,5,5,3,4}×π / 3; {3,2,1,1,1,1,5,0}×π / 3; {4,3,2,2,2,2,0,1}×π / 3; {2,1,0,0,0,0,4,5}×π / 3; or, {5,4,3,3,3,0,1,2}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,2,3,0,0,3,0,0}×π / 3, and the corresponding PAPR is 4.5375dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5,0,1,1,1,1,3,2}×π / 3; {0,1,2,2,2,2,4,3}×π / 3; {2,3,4,4,4,4,0,5}×π / 3; {1,2,3,3,3,3,5,4}×π / 3; {3,4,5,5,5,5,1,0}×π / 3; {4,5,0,0,0,0,2,1}×π / 3; {0,5,4,4,4,4,2,3}×π / 3; {1,0,5,5,5,5,3,4}×π / 3; {3,2,1,1,1,1,5,0}×π / 3; {4,3,2,2,2,2,0,1}×π / 3; {2,1,0,0,0,0,4,5}×π / 3; or, {5,4,3,3,3,0,1,2}×π / 3, the corresponding PAPR is 5.2348dB.

[0062] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, or, {1, 0.5, 1, 0.5, 0, 1.5, 3.5, 0} × π / 3; {2, 1.5, 2, 1.5, 1, 2.5, 4.5, 1} × π / 3; {0, 5.5, 0, 5.5, 5, 0.5, 2.5, 5} × π / 3; {3, 2.5, 3, 2.5, 2, 3.5, 3.5, 2} × π / 3; {4, 3.5, 4, 3.5, 5} × π / 3. =5,6,8,11,6,12,7,9,13}×π / 3; {5,4.5,5,5,5,0,4.5,2.5,0}×π / 3; {0,0.5,0,0.5,1,5.5,3.5,1}×π / 3; {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3; {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3; {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3; or, {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, and the corresponding PAPR is 4.4794 dB; Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, and the corresponding PAPR is 4.4794 dB. The number of spatial streams of the sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, then the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1, 0.5, 1, 0.5, 0, 1.5, 3.5, 0} × π / 3; {2, 1.5, 2, 1.5, 1, 2.5, 4.5, 1} × π / 3; {0, 5.5, 0, 5.5, 5, 0.5, 2.5, 5} × π / 3; {3,2.5,3,2.5,2,3.5,3.5,2}×π / 3; {4,3.5,4,3.5,3,4.5,0.5,3}×π / 3{5,4.5,5,4.5,4,5.5,1.5,4}×π / 3; {5,5.5,5,5.5,0,4.5,2.5,0}×π / 3; {0,0.5,0,0.5,1,5.5,3.5,1} ×π / 3; {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3; {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3; {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3; or, {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3, and the corresponding PAPR is 5.1680dB.

[0063] It should be noted that for the 4xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.8262dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.3647dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0064] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0065] Exemplarily, the PPDU may be transmitted using a second bandwidth, which is a bandwidth at a high frequency. For example, the second bandwidth may be a bandwidth of 40 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0066] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-58, -57, …, 0, …, 57, 58}, and the position index set of the pilot subcarrier is {-35, -25, -11, 11, 25, 35}, with a total of 6 pilot positions.

[0067] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,3,3,0}×π / 3, or {0,3,0,3,0,3}×π / 3; or {3,0,3,0,3,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,3,0,3,3,0}×π / 3, and the corresponding PAPR is 5.8211dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,0,3,0,3}×π / 3; or {3,0,3,0,3,0}×π / 3, and the corresponding PAPR is 6.6342dB.

[0068] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4, 2, 0, 3, 2, 0} × π / 3, or, {1, 4, 1, 4, 0, 3} × π / 3; {2, 5, 2, 5, 1, 4} × π / 3; {3, 0, 3, 0, 2, 5} × π / 3; {5, 2, 5, 2, 4, 1} × π / 3; {0, 3, 0, 3, 5, 2}×π / 3; {4,1,4,1,3,0}×π / 3; {1,4,1,4,2,5}×π / 3; {0,3,0,3,1,4}×π / 3; {5,2,5,2,0,3}×π / 3; {2,5,2,5,3,0}×π / 3; {4,1,4,1,5,2}×π / 3; or, {3,0,3,0,4,1}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4, 2, 0, 3, 2, 0} × π / 3; or, {2, 4, 0, 3, 4, 3} × π / 3, and the corresponding PAPR is 5.8001dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1, 4, 1, 4, 0, 3} × π / 3; {2, 5, 2, 5, 1, 4}×π / 3; {3,0,3,0,2,5}×π / 3; {5,2,5,2,4,1}×π / 3; {0,3,0,3,5,2}×π / 3; {4,1,4,1,3,0}×π / 3; {1,4,1,4,2,5}×π / 3; {0,3,0,3,1,4}×π / 3; {5,2,5,2,0,3}×π / 3; {2,5,2,5,3,0}×π / 3; {4,1,4,1,5,2}×π / 3; or, {3,0,3,0,4,1}×π / 3, the corresponding PAPR is 6.6342dB.

[0069] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {2.5, 4.5, 0.5, 3, 4, 0} × π / 3; or, {3.5, 1.5, 5.5, 3, 2, 0} × π / 3, or, {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; or, {4.5, 1.5, 3, 0, 5.5, 3} × π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {2.5, 4.5, 0.5, 3, 4, 0} × π / 3; or, {3.5, 1.5, 5.5, 3, 2, 0} × π / 3, and the corresponding PAPR is 5.6738 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, then The pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; or, {4.5, 1.5, 3, 0, 5.5, 3} × π / 3, and the corresponding PAPR is 6.4748 dB.

[0070] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 7.0352dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 7.0352dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided by the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy.

[0071] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0072] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the pilot position index set corresponding to the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, with a total of 16 pilot positions.

[0073] Optionally, the second bandwidth is the bandwidth of the 40 MHz bandwidth after clocking in, and this implementation is performed for the transmission of a 2xLTF sequence of the PPDU.

[0074] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, or, {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3; or, {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, and the corresponding PAPR is 4.9279dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3; or, {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3, and the corresponding PAPRs are 5.7861dB.

[0075] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, or, {3,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3; {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3; {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3; or, {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, and the corresponding PAPR is 4.9279dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3 ,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3; {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3; {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3; or, {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3, the corresponding PAPR is 5.7302 dB.

[0076] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 5.5, 5.5, 0, 2.5, 3.5, 3.5, 5.5, 0, 2.5, 3, 0, 3, 5.5, 2.5, 3.5} × π / 3; or, {3, 0.5, 0.5, 0, 3.5, 2.5, 2.5, 0.5, 0, 3.5, 3, 0, 3, 0.5, 3.5, 2.5} × π / 3, or, {2.5, 4, 4, 4.5, 1.5, 2, 0, 0.5, 3.5, 4, 1.5 ,0.5,0.5,0,2,2}×π / 3; {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3; {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3; or, {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 5.5, 5.5, 0, 2.5, 3.5, 3.5, 5.5, 0, 2.5, 3, 0, 3, 5.5, 2.5, 3.5} × π / 3; or, {3, 0.5, 0.5, 0, 3.5, 2.5, 2.5, 0.5, 0, 3.5, 3, 0, 3, 0.5, 3.5, 2.5} × π / 3, and the corresponding PAPR is 4.8778 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {2.5,4,4,4.5,1.5,2,0,0.5,3.5,4,1.5,0.5,0.5,0,2,2}×π / 3; {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3; {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3; or {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3, and the corresponding PAPR is 5.6206 dB.

[0077] It should be noted that for the 2xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 5.8114dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.8377dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0078] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0079] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, …, 0, …, 243, 244}, and the position index set of the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, with a total of 16 pilot positions.

[0080] Optionally, the second bandwidth is the bandwidth of 40 MHz after clocking in, and this implementation is performed for the transmission of a 4xLTF sequence of the PPDU.

[0081] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3, or, {3,3,0,0,3,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3, and the corresponding PAPR is 4.8160dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,3,3,3,0,0,0,0,0,3,3}×π / 3; or, {3,3,3,3,0,0,0,0,3,3,3,3,3,3,0,0}×π / 3, and the corresponding PAPR is 5.3146dB.

[0082] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3; or, {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3, {5,0,0,1,3,3,4,3,0,1,5, or, {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3; or, {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3, and the corresponding PAPR is 4.7941dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {5,0,0,1,3,3,4,3,0,1,5,5,5,5,3,3}×π / 3; {1,0,0,5,3,3,2,3,0,5,1,1,1,1,3,3}×π / 3; {2,3,3,4,0,0,1,0,3,4,2,2,2,2,0,0}×π / 3; or, {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3, and the corresponding PAPR is 5.2597 dB.

[0083] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3.5, 3, 1.5, 1.5, 3.5, 5, 2.5, 0.5, 0, 1, 5.5, 3, 3.5, 5.5, 5.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5, 3, 2.5, 0.5, 0.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5, 3, 2.5, 0.5, 0.5, 0} × π / 3, {3.5, 3.5, 2.5, 1.5, 0.5, =5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3; {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3; {0.5,0.5,5.5,4.5,3.5,2.5,1.5,2.5,5.5,5,0.5,0.5,1.5,1,3,3}×π / 3; or, {2.5,2.5,3.5,4.5,5.5,0.5,1.5,0.5,3.5,4,2.5,2.5,1.5,2,0,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3.5, 3, 1.5, 1.5, 3.5, 5, 2.5, 0.5, 0, 1, 5.5, 3, 3.5, 5.5, 5.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5} × π / 3; ,3,2.5,0.5,0.5,0}×π / 3; or, {2.5,3,4.5,4.5,2.5,1,3.5,5.5,0,5,0.5,3,2.5,0.5,0.5,0}×π / 3, the corresponding PAPR is 4.7217dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, then The pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3.5,3.5,2.5,1.5,0.5,5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3; {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3; {0.5, 0.5, 5.5, 4.5, 3.5, 2.5, 1.5, 2.5, 5.5, 5, 0.5, 0.5, 1.5, 1, 3, 3} × π / 3; or, {2.5, 2.5, 3.5, 4.5, 5.5, 0.5, 1.5, 0.5, 3.5, 4, 2.5, 2.5, 1.5, 2, 0, 0} × π / 3, and the corresponding PAPR is 5.1970 dB.

[0084] It should be noted that for the 4xLTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 5.2466dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.4693dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0085] Based on the above scheme, by designing different pilot phase rotation angles θ k, so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0086] Exemplarily, the PPDU may be transmitted using a third bandwidth, which is a bandwidth at a high frequency. For example, the third bandwidth may be a bandwidth of 80 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0087] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is a third bandwidth of 80 MHz, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-103, -75, -39, -11, 11, 39, 75, 103}, with a total of 8 pilot positions.

[0088] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,3,3,3}×π / 3, or, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,3,0}×π / 3; {3,0,0,3,0,3,3,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}× π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,3,3,3,3,3}×π / 3, and the corresponding PAPR is 8.5338dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0 ,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPRs are all 9.4170dB.

[0089] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,2,3,4}×π / 3; or, {0,1,0,4,3,4,3,2}×π / 3, or, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,3,0}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3, 3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / .Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,2,3,4}×π / 3; or, {0,1,0,4,3,4,3,2}×π / 3, and the corresponding PAPR is 8.4175dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4 , 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0 ,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3 ,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPR are all 9.4170dB.

[0090] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,4.5,0,0.5,3,3,3,3}×π / 3; or, {0,1.5,0,3,3,3,3,3}×π / 3, or, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0, 3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0, 4.5, 0, 0.5, 3, 3, 3, 3} × π / 3; or, {0, 1.5, 0, 3, 3, 3, 3, 3} × π / 3, and the corresponding PAPR is 8.4035 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7, or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3, 0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; { 3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPRs are all 9.4170dB.

[0091] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 10.1412dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 10.1412dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0092] Based on the above scheme, by designing different pilot phase rotation angles θ k, so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0093] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, …, 0, …, 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, with a total of 16 pilot positions.

[0094] Optionally, the third bandwidth is the bandwidth of 80 MHz after clocking in, and this implementation is performed for the transmission of a 2xLTF sequence of an 80 MHz PPDU.

[0095] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3, or, {3,0,3,0,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3; or, {0,3,0,3,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3, and the corresponding PAPR is 5.3096dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3; or, {0,3,0,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3, and the corresponding PAPR is 5.8976dB.

[0096] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3; or, {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3, or, {2,1,3,1,1,1,0,1,1,1,1 ,0,3,3,2,0}×π / 3; {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3; {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3; or, {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3; or, {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3, and the corresponding PAPR is 5.2543dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {2,1,3,1,1,1,0,1,1,1,1,0,3,3,2,0}×π / 3; {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3; {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3; or, {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3, and the corresponding PAPR is 5.8324dB.

[0097] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0.5, 0.5, 2, 0.5, 2.5, 0.5, 3, 2.5, 1.5, 0.5, 0, 3, 3.5, 0.5, 3, 0} × π / 3; or, {5.5, 5.5, 4, 5.5, 3.5, 5.5, 3, 3.5, 4.5, 5.5, 0, 3, 2.5, 5.5, 3, 0} × π / 3, or, optionally, {2, 1, 2.5, 0.5, 1.5, 1.5, 0, 0.5, 0.5, 1 ,1,0,3,2.5,0.5,0}×π / 3;{4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3;{5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3;or,{1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0.5, 0.5, 2, 0.5, 2.5, 0.5, 3, 2.5, 1.5, 0.5, 0, 3, 3.5, 0.5, 3, 0} × π / 3; or, {5.5, 5.5, 4, 5.5, 3.5, 5.5, 3, 3.5, 4.5, 5.5, 0, 3, 2.5, 5.5, 3, 0} × π / 3, and the corresponding PAPR is 5.2159 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {2,1,2.5,0.5,1.5,1.5,0,0.5,0.5,1,1,0,3,2.5,0.5,0}×π / 3; {4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3; {5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3; or {1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3, and the corresponding PAPR is 5.7885 dB.

[0098] It should be noted that for the 2xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 6.0060dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 6.0766dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0099] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0100] In combination with the first aspect, in certain implementations of the first aspect, when the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, …, 0, …, 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, with a total of 16 pilot positions.

[0101] Optionally, the third bandwidth is the bandwidth of 80 MHz after clocking in, and this implementation is performed for the transmission of a 4xLTF sequence of PPDU.

[0102] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3, or, {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3; or, {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3, and the corresponding PAPR is 5.8772dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3; or, {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3, and the corresponding PAPRs are all 6.2356dB.

[0103] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3; optionally, {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3, {3,5,0,4,3,5,0,0,3,5,0, {4,3,5,0,0}×π / 3; {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3; {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3; or, {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3; or, {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3, and the corresponding PAPR is 5.8735dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {3,5,0,4,3,5,0,0,3,5,0,4,3,5,0,0}×π / 3; {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3; {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3; or, {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3, and the corresponding PAPR is 6.2232dB.

[0104] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 0, 3.5, 5.5, 0.5, 0.5, 2.5, 3, 0, 0, 3.5, 3.5, 0.5, 0.5, 2.5, 3} × π / 3; or, {3, 0, 2.5, 0.5, 5.5, 5.5, 3.5, 3, 0, 0, 2.5, 2.5, 5.5, 5.5, 3.5, 3} × π / 3, or, {3,4.5,5.5,4,2.5,4.5,0,0,3,4.5,0,4,3,4.5,5.5,0}×π / 3; {3.5,5.5,5.5,4.5,3,5,0,0,3.5,5.5,0,4.5,3.5,5,5.5,0}×π / 3; {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2 ,3,1.5,0.5,0}×π / 3;{2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3;{0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3;{0.5,2.5,2.5,1.5,0,2 ,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3; {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3; or, {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3, 0, 3.5, 5.5, 0.5, 0.5, 2.5, 3, 0, 0, 3.5, 3.5, 0.5, 0.5, 2.5, 3} × π / 3; or, {3, 0, 2.5, 0.5, 5.5, 5.5, 3.5, 3, 0, 0, 2.5, 2.5, 5.5, 5.5, 3.5, 3} × π / 3, and the corresponding PAPRs are 5.8562dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 4.5, 5.5, 4, 2.5, 4.5, 0, 0, 3, 4.5, 0, 4, 3, 4.5, 5.5, 0} × π / 3; {3.5, 5.5, 5.5, 4.5, 3, 5, 0, 0, 3.5, 5.5, 0, 4.5, 3.5, 5, 5 .5,0}×π / 3; {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2,3,1.5,0.5,0}×π / 3; {2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3; {0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3; {0.5,2. The PAPR of the network is 6.2037dB for the following examples: 5,2.5,1.5,0,2,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3; {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3; or {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3, and the corresponding PAPR is 6.2037dB for the following examples:

[0105] It should be noted that for the 4xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 6.1788dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 6.2851dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0106] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0107] In a second aspect, a communication method is provided. The method may be executed by a receiving end or by a component (eg, a chip, a circuit, or a module, etc.) configured in the receiving end, and the present application does not limit the method.

[0108] The method includes: receiving a physical layer protocol data unit PPDU, the PPDU includes a first field, the first field carries a first sequence passing through a wireless channel, the first sequence passing through the wireless channel includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; and performing phase tracking according to the sequence on the pilot subcarrier.

[0109] According to the solution provided by this application, by designing the rotation factor As well as the value of the rotation factor, the value of the pilot phase rotation angle (also referred to as the pilot phase) does not only include 0 and π, but can be extended to more pilot phases θ k Correspondingly, the values ​​of the sequence on the pilot subcarrier in the first sequence include not only ±1, but can be extended to This implementation is suitable for multiplexing the low-frequency first sequence into the low-complexity high-frequency millimeter wave communication scenario, which can reduce the PAPR of the first sequence over the entire bandwidth and improve the transmission performance. At the same time, this implementation changes the pilot phase rotation angle corresponding to the sequence on the pilot subcarrier, and does not affect the effect of the receiving end using the sequence on the pilot subcarrier for phase tracking.

[0110] In conjunction with the second aspect, in some implementations of the second aspect, the sequence on the pilot subcarrier is obtained based on the rotation factor, including: the sequence on the pilot subcarrier is generated according to the spatial mapping matrix, the spatial mapping matrix It is expressed as:

[0111] And the first sequence uses a single-stream pilot;

[0112] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×NLTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number, such as α k =1.

[0113] In conjunction with the second aspect, in some implementations of the second aspect, the first sequence is generated according to a spatial mapping matrix, and the spatial mapping matrix It is expressed as:

[0114]

[0115] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number, such as α k =1. LTF The spatial mapping matrix corresponding to the sequence on the non-pilot subcarriers in the first sequence is represented.

[0116] In conjunction with the second aspect, in some implementations of the second aspect, θ k The value of is any of the following: {0,3}×π / 3; or, θ k The value of is any of the following: {0,1,2,3,4,5}×π / 3; or, θ k The value of is any of the following: {0,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5}×π / 3.

[0117] Exemplarily, the PPDU may be transmitted using a first bandwidth, which is a bandwidth at a high frequency. For example, the first bandwidth may be a bandwidth of 20 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0118] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-28, -27, ..., 0, ..., 27, 28}, and the position index set of the pilot subcarrier is {-21, -7, 7, 21}, with a total of 4 pilot positions.

[0119] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or {0,0,0,3}×π / 3, or {3,3,3,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3, or {3,3,3,0}×π / 3, and the corresponding PAPR is 5.3426dB.

[0120] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or, {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3, and the corresponding PAPRs are all 5.3426dB.

[0121] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or, {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3, and the corresponding PAPRs are all 5.3426dB.

[0122] It should be noted that for the LTF sequence of the existing 802.11ac 20MHz PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.1904dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.6075dB. In the above three examples, when LTF is transmitted using a single-stream pilot, the pilot phase provided by the present application will not cause an increase in PAPR; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase provided by the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, and ensure low PAPR performance during multi-spatial stream transmission.

[0123] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, with a total of 8 pilot positions.

[0124] Optionally, the first bandwidth is a bandwidth of 20 MHz after clocking in, and the implementation method is performed for transmission of a 2xLTF sequence of a PPDU.

[0125] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,0,0,0}×π / 3, or, {0,0,0,0,3,3,0,0}×π / 3; or, {0,0,0,0,0,0,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0,3,0,0,0}×π / 3, and the corresponding PAPR is 4.3610dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,3,0,0}×π / 3; or, {0,0,0,0,0,0,3,3}×π / 3, and the corresponding PAPR is 5.1933dB.

[0126] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,0,0,0}×π / 3, or, {3,3,4,4,1,1,3,3}×π / 3; {4,4,5,5,2,2,4,4}×π / 3; {0,0,1,1,4,4,0,0}×π / 3; {2,2,3,3,0,0,2,2}×π / 3; {5,5,0,0,3,3,5,5}× π / 3{1,1,2,2,5,5,1,1}×π / 3;{4,4,3,3,0,0,4,4}×π / 3;{0,0,5,5,2,2,0,0}×π / 3;{1,1,0,0,3,3,1,1}×π / 3;{2,2,1,1,4,4,2,2}×π / 3;{3,3,2,2,5,5,3,3}×π / 3;or, {5,5,4,4,1,1,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0,3,0,0,0}×π / 3, and the corresponding PAPR is 4.3610dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,4,4,1,1,3,3}×π / 3; {4,4,5,5,2,2,4,4}×π / 3; {0,0,1,1,4,4,0,0}×π / 3 ; {2,2,3,3,0,0,2,2}×π / 3; {5,5,0,0,3,3,5,5}×π / 3{1,1,2,2,5,5,1,1}×π / 3; {4,4,3,3,0,0,4,4}×π / 3; {0,0,5,5,2,2,0,0}×π / 3; {1,1,0,0,3,3,1,1}×π / 3; {2,2,1,1,4,4,2,2}×π / 3; {3,3,2,2,5,5,3,3}×π / 3; or, {5,5,4,4,1,1,5,5}×π / 3, the corresponding PAPR is 4.9648dB.

[0127] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4.5, 3, 5, 5.5, 0.5, 5.5, 0, 0} × π / 3; or, {1.5, 3, 1, 0.5, 5.5, 0.5, 0, 0} × π / 3, or, {5.5, 0, 0.5, 0.5, 3.5, 3.5, 5.5, 5.5} × π / 3; { 2.5,3,3.5,3.5,0.5,0.5,2.5,2.5}×π / 3; {3.5,4,4.5,4.5,1.5,1.5,3.5,3.5}×π / 3; {4.5,5,5.5,5.5,2.5,2.5,4.5,4.5}×π / 3; {0.5,0,5.5,5.5,2.5,2.5,0.5 ,0.5}×π / 3; {0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3; {1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3; {1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3; {4.5,4,3.5,3.5 ,0.5,0.5,4.5,4.5}×π / 3; {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3; {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3; or, {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4.5, 3, 5, 5.5, 0.5, 5.5, 0, 0} × π / 3; or, {1.5, 3, 1, 0.5, 5.5, 0.5, 0, 0} × π / 3, and the corresponding PAPR is 4.2260 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7, or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {5.5, 0, 0.5, 0.5, 3.5, 3.5, 5.5, 5.5} × π / 3; {2.5, 3, 3.5, 3.5, 0.5, 0.5, 2.5, 2.5} × π / 3; {3.5, 4, 4.5, 4.5, 1.5, 1.5, 3.5, 3.5} × π / 3; {4.5, 5, 5.5, 5.5, 2.5 ,2.5,4.5,4.5}×π / 3;{0.5,0,5.5,5.5,2.5,2.5,0.5,0.5}×π / 3;{0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3;{1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3;{1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3;{ 4.5,4,3.5,3.5,0.5,0.5,4.5,4.5}×π / 3; {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3; {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3; or, {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3, and the corresponding PAPR is 4.9595dB.

[0128] It should be noted that for the 2xLTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.8678dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.2395dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0129] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, with a total of 8 pilot positions.

[0130] Optionally, the first bandwidth is the bandwidth of 20 MHz after clocking in, and the implementation method is performed for the transmission of a 4xLTF sequence of the PPDU.

[0131] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0, 3, 3, 0, 0, 3, 0, 0} × π / 3, or,

[0132] {0,3,3,3,3,3,0,0}×π / 3; or, {3,0,0,0,0,0,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,3,3,0,0,3,0,0}×π / 3, and the corresponding PAPR is 4.5930dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,3,3,3,0,0}×π / 3; or, {3,0,0,0,0,0,3,3}×π / 3, and the corresponding PAPR is 5.3274dB.

[0133] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0, 2, 3, 0, 0, 3, 0, 0} × π / 3, or,

[0134] {5,0,1,1,1,1,3,2}×π / 3; {0,1,2,2,2,2,4,3}×π / 3; {2,3,4,4,4,4,0,5}×π / 3; {1,2,3,3,3,3,5,4}×π / 3; {3,4,5,5,5,5,1,0}×π / 3; {4,5,0,0,0,0,2,1}×π / 3; { {0,5,4,4,4,4,2,3}×π / 3; {1,0,5,5,5,5,3,4}×π / 3; {3,2,1,1,1,1,5,0}×π / 3; {4,3,2,2,2,2,0,1}×π / 3; {2,1,0,0,0,0,4,5}×π / 3; or, {5,4,3,3,3,0,1,2}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,2,3,0,0,3,0,0}×π / 3, and the corresponding PAPR is 4.5375dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5,0,1,1,1,1,3,2}×π / 3; {0,1,2,2,2,2,4,3}×π / 3; {2,3,4,4,4,4,0,5}×π / 3; {1,2,3,3,3,3,5,4}×π / 3; {3,4,5,5,5,5,1,0}×π / 3; {4,5,0,0,0,0,2,1}×π / 3; {0,5,4,4,4,4,2,3}×π / 3; {1,0,5,5,5,5,3,4}×π / 3; {3,2,1,1,1,1,5,0}×π / 3; {4,3,2,2,2,2,0,1}×π / 3; {2,1,0,0,0,0,4,5}×π / 3; or, {5,4,3,3,3,0,1,2}×π / 3, the corresponding PAPR is 5.2348dB.

[0135] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, or, {1, 0.5, 1, 0.5, 0, 1.5, 3.5, 0} × π / 3; {2, 1.5, 2, 1.5, 1, 2.5, 4.5, 1} × π / 3; {0, 5.5, 0, 5.5, 5, 0.5, 2.5, 5} × π / 3; {3, 2.5, 3, 2.5, 2, 3.5, 3.5, 2} × π / 3; {4, 3.5, 4, 3.5, 5} × π / 3. =5,6,8,11,6,12,7,9,13}×π / 3; {5,4.5,5,5,5,0,4.5,2.5,0}×π / 3; {0,0.5,0,0.5,1,5.5,3.5,1}×π / 3; {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3; {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3; {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3; or, {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, and the corresponding PAPR is 4.4794 dB; Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, and the corresponding PAPR is 4.4794 dB. The number of spatial streams of the sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, then the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1, 0.5, 1, 0.5, 0, 1.5, 3.5, 0} × π / 3; {2, 1.5, 2, 1.5, 1, 2.5, 4.5, 1} × π / 3; {0, 5.5, 0, 5.5, 5, 0.5, 2.5, 5} × π / 3; {3,2.5,3,2.5,2,3.5,3.5,2}×π / 3; {4,3.5,4,3.5,3,4.5,0.5,3}×π / 3{5,4.5,5,4.5,4,5.5,1.5,4}×π / 3; {5,5.5,5,5.5,0,4.5,2.5,0}×π / 3; {0,0.5,0,0.5,1,5.5,3.5,1} ×π / 3; {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3; {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3; {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3; or, {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3, and the corresponding PAPR is 5.1680dB.

[0136] It should be noted that for the 4xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.8262dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.3647dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0137] Exemplarily, the PPDU may be transmitted using a second bandwidth, which is a bandwidth in a high frequency. For example, the second bandwidth may be a bandwidth of 40 MHz bandwidth after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0138] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-58, -57, ..., 0, ..., 57, 58}, and the position index set of the pilot subcarrier is {-35, -25, -11, 11, 25, 35}, with a total of 6 pilot positions.

[0139] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,3,3,0}×π / 3, or {0,3,0,3,0,3}×π / 3; or {3,0,3,0,3,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,3,0,3,3,0}×π / 3, and the corresponding PAPR is 5.8211dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,0,3,0,3}×π / 3; or {3,0,3,0,3,0}×π / 3, and the corresponding PAPR is 6.6342dB.

[0140] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4, 2, 0, 3, 2, 0} × π / 3, or, {1, 4, 1, 4, 0, 3} × π / 3; {2, 5, 2, 5, 1, 4} × π / 3; {3, 0, 3, 0, 2, 5} × π / 3; {5, 2, 5, 2, 4, 1} × π / 3; {0, 3, 0, 3, 5, 2}×π / 3; {4,1,4,1,3,0}×π / 3; {1,4,1,4,2,5}×π / 3; {0,3,0,3,1,4}×π / 3; {5,2,5,2,0,3}×π / 3; {2,5,2,5,3,0}×π / 3; {4,1,4,1,5,2}×π / 3; or, {3,0,3,0,4,1}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4, 2, 0, 3, 2, 0} × π / 3; or, {2, 4, 0, 3, 4, 3} × π / 3, and the corresponding PAPR is 5.8001dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1, 4, 1, 4, 0, 3} × π / 3; {2, 5, 2, 5, 1, 4}×π / 3; {3,0,3,0,2,5}×π / 3; {5,2,5,2,4,1}×π / 3; {0,3,0,3,5,2}×π / 3; {4,1,4,1,3,0}×π / 3; {1,4,1,4,2,5}×π / 3; {0,3,0,3,1,4}×π / 3; {5,2,5,2,0,3}×π / 3; {2,5,2,5,3,0}×π / 3; {4,1,4,1,5,2}×π / 3; or, {3,0,3,0,4,1}×π / 3, the corresponding PAPR is 6.6342dB.

[0141] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {2.5, 4.5, 0.5, 3, 4, 0} × π / 3; or, {3.5, 1.5, 5.5, 3, 2, 0} × π / 3, or, {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; or, {4.5, 1.5, 3, 0, 5.5, 3} × π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {2.5, 4.5, 0.5, 3, 4, 0} × π / 3; or, {3.5, 1.5, 5.5, 3, 2, 0} × π / 3, and the corresponding PAPR is 5.6738 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, then The pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; or, {4.5, 1.5, 3, 0, 5.5, 3} × π / 3, and the corresponding PAPR is 6.4748 dB.

[0142] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 7.0352dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 7.0352dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided by the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy.

[0143] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the pilot position index set corresponding to the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, with a total of 16 pilot positions.

[0144] Optionally, the second bandwidth is the bandwidth of the 40 MHz bandwidth after clocking in, and this implementation is performed for the transmission of a 2xLTF sequence of the PPDU.

[0145] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, or, {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3; or, {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, and the corresponding PAPR is 4.9279dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3; or, {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3, and the corresponding PAPRs are 5.7861dB.

[0146] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, or, {3,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3; {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3; {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3; or, {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, and the corresponding PAPR is 4.9279dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3 ,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3; {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3; {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3; or, {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3, the corresponding PAPR is 5.7302 dB.

[0147] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 5.5, 5.5, 0, 2.5, 3.5, 3.5, 5.5, 0, 2.5, 3, 0, 3, 5.5, 2.5, 3.5} × π / 3; or, {3, 0.5, 0.5, 0, 3.5, 2.5, 2.5, 0.5, 0, 3.5, 3, 0, 3, 0.5, 3.5, 2.5} × π / 3, or, {2.5, 4, 4, 4.5, 1.5, 2, 0, 0.5, 3.5, 4, 1.5 ,0.5,0.5,0,2,2}×π / 3; {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3; {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3; or, {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 5.5, 5.5, 0, 2.5, 3.5, 3.5, 5.5, 0, 2.5, 3, 0, 3, 5.5, 2.5, 3.5} × π / 3; or, {3, 0.5, 0.5, 0, 3.5, 2.5, 2.5, 0.5, 0, 3.5, 3, 0, 3, 0.5, 3.5, 2.5} × π / 3, and the corresponding PAPR is 4.8778 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {2.5,4,4,4.5,1.5,2,0,0.5,3.5,4,1.5,0.5,0.5,0,2,2}×π / 3; {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3; {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3; or {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3, and the corresponding PAPR is 5.6206 dB.

[0148] It should be noted that for the 2xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 5.8114dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.8377dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0149] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the position index set of the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, with a total of 16 pilot positions.

[0150] Optionally, the second bandwidth is the bandwidth of 40 MHz after clocking in, and this implementation is performed for the transmission of a 4xLTF sequence of the PPDU.

[0151] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3, or, {3,3,0,0,3,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3, and the corresponding PAPR is 4.8160dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,3,3,3,0,0,0,0,0,3,3}×π / 3; or, {3,3,3,3,0,0,0,0,3,3,3,3,3,3,0,0}×π / 3, and the corresponding PAPR is 5.3146dB.

[0152] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3; or, {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3, {5,0,0,1,3,3,4,3,0,1,5, or, {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3; or, {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3, and the corresponding PAPR is 4.7941dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {5,0,0,1,3,3,4,3,0,1,5,5,5,5,3,3}×π / 3; {1,0,0,5,3,3,2,3,0,5,1,1,1,1,3,3}×π / 3; {2,3,3,4,0,0,1,0,3,4,2,2,2,2,0,0}×π / 3; or, {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3, and the corresponding PAPR is 5.2597 dB.

[0153] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3.5, 3, 1.5, 1.5, 3.5, 5, 2.5, 0.5, 0, 1, 5.5, 3, 3.5, 5.5, 5.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5, 3, 2.5, 0.5, 0.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5, 3, 2.5, 0.5, 0.5, 0} × π / 3, {3.5, 3.5, 2.5, 1.5, 0.5, =5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3; {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3; {0.5,0.5,5.5,4.5,3.5,2.5,1.5,2.5,5.5,5,0.5,0.5,1.5,1,3,3}×π / 3; or, {2.5,2.5,3.5,4.5,5.5,0.5,1.5,0.5,3.5,4,2.5,2.5,1.5,2,0,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3.5, 3, 1.5, 1.5, 3.5, 5, 2.5, 0.5, 0, 1, 5.5, 3, 3.5, 5.5, 5.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5} × π / 3; ,3,2.5,0.5,0.5,0}×π / 3; or, {2.5,3,4.5,4.5,2.5,1,3.5,5.5,0,5,0.5,3,2.5,0.5,0.5,0}×π / 3, the corresponding PAPR is 4.7217dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, then The pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3.5,3.5,2.5,1.5,0.5,5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3; {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3; {0.5, 0.5, 5.5, 4.5, 3.5, 2.5, 1.5, 2.5, 5.5, 5, 0.5, 0.5, 1.5, 1, 3, 3} × π / 3; or, {2.5, 2.5, 3.5, 4.5, 5.5, 0.5, 1.5, 0.5, 3.5, 4, 2.5, 2.5, 1.5, 2, 0, 0} × π / 3, and the corresponding PAPR is 5.1970 dB.

[0154] It should be noted that for the 4xLTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 5.2466dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.4693dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0155] Exemplarily, the PPDU may be transmitted using a third bandwidth, which is a bandwidth at a high frequency. For example, the third bandwidth may be a bandwidth of 80 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0156] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-122, -121, …, 0, …, 121, 122}, and the position index set of the pilot subcarrier is {-103, -75, -39, -11, 11, 39, 75, 103}, with a total of 8 pilot positions.

[0157] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,3,3,3}×π / 3, or, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,3,0}×π / 3; {3,0,0,3,0,3,3,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}× π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,3,3,3,3,3}×π / 3, and the corresponding PAPR is 8.5338dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0 ,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPRs are all 9.4170dB.

[0158] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,2,3,4}×π / 3; or, {0,1,0,4,3,4,3,2}×π / 3, or, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,3,0}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3, 3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / .Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,2,3,4}×π / 3; or, {0,1,0,4,3,4,3,2}×π / 3, and the corresponding PAPR is 8.4175dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4 , 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0 ,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3 ,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPR are all 9.4170dB.

[0159] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,4.5,0,0.5,3,3,3,3}×π / 3; or, {0,1.5,0,3,3,3,3,3}×π / 3, or, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0, 3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0, 4.5, 0, 0.5, 3, 3, 3, 3} × π / 3; or, {0, 1.5, 0, 3, 3, 3, 3, 3} × π / 3, and the corresponding PAPR is 8.4035 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7, or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3, 0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; { 3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPRs are all 9.4170dB.

[0160] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 10.1412dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 10.1412dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0161] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, …, 0, …, 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, with a total of 16 pilot positions.

[0162] Optionally, the third bandwidth is the bandwidth of 80 MHz after clocking in, and this implementation is performed for the transmission of a 2xLTF sequence of an 80 MHz PPDU.

[0163] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3, or, {3,0,3,0,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3; or, {0,3,0,3,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3, and the corresponding PAPR is 5.3096dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3; or, {0,3,0,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3, and the corresponding PAPR is 5.8976dB.

[0164] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3; or, {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3, or, {2,1,3,1,1,1,0,1,1,1,1 ,0,3,3,2,0}×π / 3; {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3; {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3; or, {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3; or, {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3, and the corresponding PAPR is 5.2543dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {2,1,3,1,1,1,0,1,1,1,1,0,3,3,2,0}×π / 3; {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3; {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3; or, {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3, and the corresponding PAPR is 5.8324dB.

[0165] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0.5, 0.5, 2, 0.5, 2.5, 0.5, 3, 2.5, 1.5, 0.5, 0, 3, 3.5, 0.5, 3, 0} × π / 3; or, {5.5, 5.5, 4, 5.5, 3.5, 5.5, 3, 3.5, 4.5, 5.5, 0, 3, 2.5, 5.5, 3, 0} × π / 3, or, optionally, {2, 1, 2.5, 0.5, 1.5, 1.5, 0, 0.5, 0.5, 1 ,1,0,3,2.5,0.5,0}×π / 3;{4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3;{5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3;or,{1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0.5, 0.5, 2, 0.5, 2.5, 0.5, 3, 2.5, 1.5, 0.5, 0, 3, 3.5, 0.5, 3, 0} × π / 3; or, {5.5, 5.5, 4, 5.5, 3.5, 5.5, 3, 3.5, 4.5, 5.5, 0, 3, 2.5, 5.5, 3, 0} × π / 3, and the corresponding PAPR is 5.2159 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {2,1,2.5,0.5,1.5,1.5,0,0.5,0.5,1,1,0,3,2.5,0.5,0}×π / 3; {4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3; {5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3; or {1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3, and the corresponding PAPR is 5.7885 dB.

[0166] It should be noted that for the 2xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 6.0060dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 6.0766dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0167] In combination with the second aspect, in certain implementations of the second aspect, when the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, ..., 0, ..., 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, with a total of 16 pilot positions.

[0168] Optionally, the third bandwidth is the bandwidth of 80 MHz after clocking in, and this implementation is performed for the transmission of a 4xLTF sequence of PPDU.

[0169] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3, or, {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3; or, {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3, and the corresponding PAPR is 5.8772dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3; or, {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3, and the corresponding PAPRs are all 6.2356dB.

[0170] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3; optionally, {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3, {3,5,0,4,3,5,0,0,3,5,0, {4,3,5,0,0}×π / 3; {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3; {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3; or, {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3; or, {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3, and the corresponding PAPR is 5.8735dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {3,5,0,4,3,5,0,0,3,5,0,4,3,5,0,0}×π / 3; {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3; {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3; or, {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3, and the corresponding PAPR is 6.2232dB.

[0171] Exemplarily, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 0, 3.5, 5.5, 0.5, 0.5, 2.5, 3, 0, 0, 3.5, 3.5, 0.5, 0.5, 2.5, 3} × π / 3; or, {3, 0, 2.5, 0.5, 5.5, 5.5, 3.5, 3, 0, 0, 2.5, 2.5, 5.5, 5.5, 3.5, 3} × π / 3, or, {3,4.5,5.5,4,2.5,4.5,0,0,3,4.5,0,4,3,4.5,5.5,0}×π / 3; {3.5,5.5,5.5,4.5,3,5,0,0,3.5,5.5,0,4.5,3.5,5,5.5,0}×π / 3; {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2 ,3,1.5,0.5,0}×π / 3;{2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3;{0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3;{0.5,2.5,2.5,1.5,0,2 ,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3; {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3; or, {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3, 0, 3.5, 5.5, 0.5, 0.5, 2.5, 3, 0, 0, 3.5, 3.5, 0.5, 0.5, 2.5, 3} × π / 3; or, {3, 0, 2.5, 0.5, 5.5, 5.5, 3.5, 3, 0, 0, 2.5, 2.5, 5.5, 5.5, 3.5, 3} × π / 3, and the corresponding PAPRs are 5.8562dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 4.5, 5.5, 4, 2.5, 4.5, 0, 0, 3, 4.5, 0, 4, 3, 4.5, 5.5, 0} × π / 3; {3.5, 5.5, 5.5, 4.5, 3, 5, 0, 0, 3.5, 5.5, 0, 4.5, 3.5, 5, 5 .5,0}×π / 3; {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2,3,1.5,0.5,0}×π / 3; {2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3; {0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3; {0.5,2. The PAPR of the network is 6.2037dB for the following examples: 5,2.5,1.5,0,2,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3; {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3; or {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3, and the corresponding PAPR is 6.2037dB for the following examples:

[0172] It should be noted that for the 4xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 6.1788dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 6.2851dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0173] The beneficial effects of the above-mentioned second aspect and some implementation methods of the second aspect can be referred to the relevant description of the first aspect, which will not be repeated here.

[0174] In a third aspect, a communication device is provided. The device may be a transmitting end or a component in the transmitting end (eg, a chip, a circuit or a module, etc.), which is not limited in the present application.

[0175] The device includes: a processing unit, used for generating a physical layer protocol data unit PPDU, the PPDU includes a first field, the first field is used to carry a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; a transceiver unit, used for sending the PPDU.

[0176] The transceiver unit can perform the reception and transmission processing in the aforementioned first aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned first aspect.

[0177] The technical effects of the device shown in the third aspect above can refer to the technical effects in the first aspect and its possible designs.

[0178] In a fourth aspect, a communication device is provided. The device may be a receiving end or a component in the receiving end (eg, a chip, a circuit or a module, etc.), which is not limited in the present application.

[0179] The device includes: a transceiver unit, which is used to receive a physical layer protocol data unit PPDU, the PPDU includes a first field, the first field carries a first sequence passing through a wireless channel, the first sequence passing through the wireless channel includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; phase tracking is performed according to the sequence on the pilot subcarrier.

[0180] The transceiver unit can perform the reception and transmission processing in the aforementioned second aspect, and the processing unit can perform other processing except reception and transmission in the aforementioned second aspect.

[0181] The technical effects of the device shown in the fourth aspect above can refer to the technical effects in the second aspect and its possible designs.

[0182] In a fifth aspect, a communication device is provided, comprising a processor, configured to call and run a computer program stored in a memory, and control a transceiver to send and receive signals, so that the communication device performs a method as in any aspect of the first aspect or the second aspect, or any possible implementation of these aspects. Optionally, the communication device may further include the memory, configured to store the computer program, and the communication device may further include the transceiver.

[0183] In a sixth aspect, a communication device is provided, comprising a processor, the processor being used to process data and / or information so that the method in any aspect of the first aspect or the second aspect, or any possible implementation of these aspects, is executed. Optionally, the communication device may also include a communication interface, the communication interface being used to receive data and / or information, and transmit the received data and / or information to the processor. Optionally, the communication interface is also used to output the data and / or information processed by the processor.

[0184] In a seventh aspect, a chip is provided, comprising a processor, the processor being used to run a program or an instruction, so that the chip executes the method in any aspect of the first aspect or the second aspect, or any possible implementation of these aspects. Optionally, the chip may also include a memory, the memory being used to store the program or the instruction. Optionally, the chip may also include the transceiver.

[0185] In an eighth aspect, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to implement a method as in any aspect of the first aspect or the second aspect, or any possible implementation of these aspects.

[0186] In a ninth aspect, a computer program product is provided, the computer program product comprising a computer program code, the computer program code being used to implement a method as in any aspect of the first aspect or the second aspect, or any possible implementation of any aspect of these aspects.

[0187] In a tenth aspect, a communication system is provided, comprising the communication device in the third and fourth aspects mentioned above. BRIEF DESCRIPTION OF THE DRAWINGS

[0188] Figure 1 It is a schematic diagram of an application scenario applicable to the embodiment of the present application;

[0189] Figure 2 It is a structural diagram of a multi-stream LTF sequence provided in an embodiment of the present application;

[0190] Figure 3 is a flow chart of a communication method 300 provided in an embodiment of the present application;

[0191] Figure 4 A schematic structural diagram of a communication device 1000 provided in an embodiment of the present application;

[0192] Figure 5 A schematic structural diagram of a communication device 2000 provided in an embodiment of the present application;

[0193] Figure 6 A schematic structural diagram of a chip system 3000 provided in an embodiment of the present application. DETAILED DESCRIPTION

[0194] The technical solution in this application will be described below in conjunction with the accompanying drawings.

[0195] The technical solution provided in the embodiments of the present application can be applicable to wireless local area network (WLAN) scenarios, for example, supporting the Institute of Electrical and Electronics Engineers (IEEE) 802.11 related standards, such as 802.11a / b / g standards, 802.11n standards, 802.11ac standards, 802.11ax standards, 802.11be standards, 802.11bn standards / UHR standards / WiFi8 standards, 802.11ad standards, 802.11ay standards, 802.11bf standards / sensing standards, UWB standards / 802.15 standards.

[0196] Although the embodiments of the present application are mainly described by deploying a WLAN network, especially a network using the IEEE 802.11 system standard, it is easy for those skilled in the art to understand that the various aspects involved in the embodiments of the present application can be extended to other networks using various standards or protocols, such as BLUETOOTH networks, high-performance wireless local area networks (HIPERLAN), wireless wide area networks (WWAN), wireless personal area networks (WPAN) or other networks known now or developed later. Therefore, regardless of the coverage range and wireless access protocol used, the various aspects provided in the embodiments of the present application can be applied to any suitable wireless network.

[0197] The technical solutions of the embodiments of the present application can also be applied to various communication systems, such as: WLAN communication system, wireless fidelity (Wi-Fi) system, long term evolution (LTE) system, LTE frequency division duplex (FDD) system, LTE time division duplex (TDD), universal mobile telecommunication system (UMTS), worldwide interoperability for microwave access (WiMAX) communication system, fifth generation (5G) system or new radio (NR), sixth generation (6G) system, Internet of Things (IoT) network or vehicle to x (V2X), etc.

[0198] The above-mentioned communication system applicable to the present application is only an example for illustration, and the communication system applicable to the present application is not limited to this. A unified description is given here and no further elaboration is given below.

[0199] Figure 1 Schematic diagram of application scenarios applicable to the embodiments of the present application. Figure 1 As shown, the communication method provided by the present application is applicable to communication between stations (STA), wherein the station can be an AP-type station or a non-access point-type station (none access point station, non-AP STA), referred to as AP and non-AP stations, respectively. Specifically, the scheme of the present application is applicable to communication between an AP and one or more non-AP stations (for example, communication between AP1 and non-APSTA1, non-AP STA2), and is also applicable to communication between APs (for example, communication between AP1 and AP2), and communication between non-AP STAs and non-AP STAs (for example, communication between non-AP STA2 and non-AP STA3).

[0200] For example, an access point can be a node for a terminal (e.g., a mobile phone) to enter a wired (or wireless) network. It is mainly deployed in homes, buildings, and parks, with a typical coverage radius of tens to hundreds of meters. Of course, it can also be deployed outdoors. An access point is equivalent to a bridge connecting a wired network and a wireless network. Its main function is to connect various wireless network clients together and then connect the wireless network to Ethernet.

[0201] Specifically, the access point can be a terminal or network device with a WiFi chip, and the network device can be a server, a router, a switch, a bridge, a computer, a mobile phone, a relay station, a vehicle-mounted device, a wearable device, a network device in a 5G network, and a network device in a 6G network or a network device in a public land mobile network (PLMN), etc., which is not limited in the embodiments of the present application. The access point can be a device that supports the Wi-Fi standard. For example, the access point can also support 802.11a / b / g standards, 802.11n standards, 802.11ac standards, 802.11ax standards, 802.11be standards, 802.11bn standards / UHR standards / WiFi8 standards, 802.11ad standards, 802.11ay standards, 802.11bf standards / sensing standards, UWB standards / 802.15 standards.

[0202] A non-AP site may be a wireless communication chip, a wireless sensor or a wireless communication terminal, etc., and may also be referred to as a user, user equipment (UE), an access terminal, a user unit, a user station, a mobile station, a mobile station, a remote station, a remote terminal, a mobile device, a user terminal, a terminal, a wireless communication device, a user agent or a user device. A non-AP site may be a cellular phone, a cordless phone, a session initiation protocol (SIP) phone, a wireless local loop (WLL) station, a personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing device connected to a wireless modem, a vehicle-mounted device, an Internet of Things device, a wearable device, a terminal device in a 5G network, a terminal device in a 6G network or a terminal device in a PLMN, etc., and the embodiments of the present application are not limited to this. A non-AP site may be a device that supports the WLAN format. For example, a non-AP station may support 802.11a / b / g standards, 802.11n standards, 802.11ac standards, 802.11ax standards, 802.11be standards, 802.11bn standards / UHR standards / WiFi8 standards, 802.11ad standards, 802.11ay standards, 802.11bf standards / sensing standards, UWB standards / 802.15 standards.

[0203] Exemplarily, non-AP sites can be mobile phones, tablet computers, set-top boxes, smart TVs, smart wearable devices, vehicle-mounted communication devices, computers, Internet of Things (IoT) nodes, sensors, smart homes such as smart cameras, smart remote controls, smart water and electricity meters, and sensors in smart cities.

[0204] The above-mentioned AP or non-AP site may include a transmitter, a receiver, a memory, a processor, etc., wherein the transmitter and the receiver are respectively used for sending and receiving packet structures, the memory is used to store signaling information and store preset values ​​agreed in advance, etc., and the processor is used to parse signaling information, process related data, etc.

[0205] In order to facilitate understanding of the technical solutions of the embodiments of the present application, some terms or concepts that may be involved in the embodiments of the present application are first briefly described.

[0206] (1) Peak-to-average power ratio / PAPR:

[0207] The amplitude of wireless signals is constantly changing in the time domain, so the transmission power of wireless signals is not constant. PAPR refers to the ratio of the peak power of a signal to the average power of the signal over a period of time. Since OFDM symbols are composed of multiple independently modulated subcarrier signals, when the phases of each subcarrier are the same or similar, the superimposed signal will be modulated by the same initial phase signal, thereby generating a larger instantaneous power peak, which further leads to a higher PAPR. Since the dynamic range of general power amplifiers is limited, MIMO-OFDM signals with large PAPR can easily enter the nonlinear region of the power amplifier, resulting in nonlinear distortion of the signal, causing obvious spectrum spread interference and in-band signal distortion, resulting in a serious degradation of the performance of the entire system.

[0208] For example, the PAPR is calculated as:

[0209]

[0210] Among them, LTF represents a complete LTF sequence, including a single-stream pilot and a multi-space-stream non-pilot. The single-stream pilot is used by the receiving end to perform phase tracking when receiving the signal to solve the phase noise and residual carrier frequency offset problems. The multi-space-stream non-pilot is used for channel estimation during multi-stream transmission. IFFT (*) represents the inverse Fourier transform operation. When performing the inverse Fourier transform, upsampling can be performed, such as four times upsampling. The upsampling methods include nearest neighbor interpolation, bilinear interpolation, bicubic interpolation, or deconvolution. |*| represents absolute value calculation; represents the average operation; max(*) represents the maximum element of the sequence.

[0211] There are currently three types of subcarriers: data subcarriers, pilot subcarriers, and unused subcarriers. Among them, a pilot subcarrier is a subcarrier in which a preset sequence is placed in an OFDM symbol, and a data subcarrier is a subcarrier in which transmission data is placed. In a communication system, data subcarriers are used for the transmission of actual data, and pilot subcarriers are used to provide phase information and parameter tracking to help detect and correct subcarrier phase offsets, thereby improving the accuracy of data subcarrier resolution; unused subcarriers are neither data subcarriers nor pilot subcarriers, and include central direct current (DC) subcarriers, guard bands, and empty subcarriers.

[0212] (2) Long training field (LTF) sequence:

[0213] The LTF sequence can be used for channel estimation at the receiving end. Different bandwidths correspond to different LTF sequences. In order to accurately estimate the spatial stream channel, the WiFi standard proposes to keep the LTF sequences on each spatial stream orthogonal by multiplying the LTF sequence on the data subcarrier (i.e., non-pilot subcarrier) by the P matrix.

[0214] In the transmission scenario of multiple spatial streams, the single-stream pilot and the non-pilot of multiple spatial streams are generated at the transmitting end through the spatial mapping matrix. The columns of the spatial mapping matrix correspond to OFDM symbols and the rows correspond to spatial streams. It can be expressed as:

[0215]

[0216] Among them, K Pilot Represents the index set of pilot subcarriers, R LTF YesN LTF ×N LTF The matrix, N LTF Indicates the number of OFDM symbols in the LTF sequence, R LTF Each row of is equal to P LTF The first line, that is:

[0217] [R LTF ] n,n =[P LTF ] 1,n ,

[0218]

[0219] Taking the number of OFDM symbols in the LTF sequence as 4 as an example, the corresponding P LTF The matrix is:

[0220]

[0221] Taking the number of OFDM symbols in the LTF sequence as 6 as an example, the corresponding P LTF The matrix is:

[0222] w = exp(-j2π / 6);

[0223] Taking the number of OFDM symbols in the LTF sequence as 8 as an example, the corresponding P LTF The matrix is:

[0224]

[0225] Figure 2 This is a schematic diagram of the construction of a multi-stream LTF sequence. Figure 2As shown in the figure, the marked time is the cyclic shift delay (CSD) corresponding to each spatial stream. For the case where the number of spatial streams is less than 4, the corresponding LTF sequence can be found in Figure 2 The kth subcarrier carries the kth element LTF in the LTF sequence. k , and the LTF of the nth OFDM symbol corresponding to the mth spatial stream is consistent with P LTF The elements of the mth row and nth column in the matrix are multiplied, so for the channel H k After that, the frequency domain signal Y received by the non-AP STA k It can be expressed as: k =H k P 4*4 LTF k . Due to P LTF The matrix is ​​an orthogonal matrix (for example, I is the identity matrix, * is the conjugate transpose of the matrix), so the channel on the kth subcarrier is In this way, the corresponding multiple input multiple output (MIMO) channel on the k-th subcarrier can be estimated.

[0226] It should be understood that the above LTF construction method is only for data subcarriers. For pilot subcarriers, the corresponding LTF construction method is similar to the LTF construction method of data subcarriers, but the difference between the two is that the LTF construction method of pilot subcarriers uses R LTF Matrix, not P LTF Matrix, R LTF Each row of the matrix is ​​equal to P LTF Therefore, the elements of the LTF sequence on the data subcarrier and the elements of the LTF sequence on the pilot subcarrier may be multiplied by different values, resulting in a change in the PAPR value of the designed LTF sequence.

[0227] Currently, millimeter wave has become an important direction for future local area networks due to its large bandwidth advantage, but its high cost has limited its commercial development. Integrated millimeter wave can effectively reduce costs by multiplexing low-frequency baseband processing modules to achieve transmission on high-frequency millimeter waves, so it has attracted widespread attention. In integrated millimeter waves, since the PA linear region is smaller at high frequencies than at low frequencies, high-frequency PAs require lower PAPRs to ensure normal transmission. When the low-frequency LTF sequence is multiplexed to the high-frequency millimeter wave, the PAPR may be too high to meet the high-frequency PA.

[0228] Considering that when the receiving end uses a single-stream pilot for phase tracking, it can calculate based on the phase change degree of the pilot signal at the same position at different times, for example, it can be calculated based on the phase difference of the same pilot subcarrier corresponding to two adjacent OFDM symbols divided by time, without knowing the specific phase value information of the subcarrier. In other words, in 1x LTF, 2x LTF and 4x LTF, when the phase of a single-stream pilot changes, the receiving end can still use the pilot for phase tracking normally.

[0229] Based on this, in order to solve the problem of too high PAPR, this application designs a rotation factor By extending the pilot phase θ k The value of the pilot phase θ k The value of does not only include 0 and π. Correspondingly, the value of the sequence on the pilot subcarrier in the first sequence does not only include ±1, but can be extended to This implementation method can reduce the PAPR of the first sequence over the entire bandwidth and improve transmission performance, while also not affecting the effect of the phase tracking performed by the receiving end using the sequence on the pilot subcarrier.

[0230] In order to facilitate understanding of the embodiments of the present application, the following points are first explained.

[0231] 1) In this application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0232] 2) In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone, where A and B can be singular or plural. In the text description of this application, the character " / " generally indicates that the associated objects before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b and c can mean: a, or b, or c, or a and b, or a and c, or b and c, or a, b and c. Where a, b and c can be single or multiple, respectively.

[0233] 3) In the present application, "first", "second" and various numerical references are used to distinguish for the convenience of description and are not used to limit the scope of the embodiments of the present application. For example, they are used to distinguish different messages, etc., rather than to describe a specific order or sequence. It should be understood that the objects described in this way can be interchanged where appropriate so as to be able to describe solutions other than the embodiments of the present application.

[0234] 4) In this application, the terms "comprises" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or apparatus comprising a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to these processes, methods, products or apparatuses.

[0235] 5) In this application, "used for indication" may include being used for direct indication and being used for indirect indication. When describing that a certain indication information is used for indicating A, it may include that the indication information directly indicates A or indirectly indicates A, but it does not mean that the indication information must carry A.

[0236] 6) In this application, "communication" may also be described as "data transmission", "information transmission", "data processing", etc. "Transmission" includes "sending" and "receiving".

[0237] The technical solution provided by the present application will be described in detail below with reference to the accompanying drawings. The embodiments of the present application can be applied to a variety of different scenarios, including Figure 1 The scenario shown is, but not limited to, that scenario.

[0238] It should be understood that the embodiments shown below do not particularly limit the specific structure of the execution subject of the method provided by the embodiments of the present application. As long as it is possible to communicate according to the method provided by the embodiments of the present application by running a program that records the code of the method provided by the embodiments of the present application, for example, the execution subject of the method provided by the embodiments of the present application may be a receiving device or a sending device, or a functional module in the receiving device or the sending device that can call and execute the program.

[0239] Without loss of generality, the following describes in detail the communication method provided in the embodiment of the present application by taking the interaction between the transmitter and the receiver as an example. The transmitter involved in the embodiment of the present application may be an access point (AP) or a non-access point (non-AP) station (STA); the receiver may be an AP or a STA, and the present application does not limit this. For example, a communication scenario may be: the transmitter is an AP and the receiver is an STA; a communication scenario may be: the transmitter is an STA and the receiver is an AP; a communication scenario may be: the transmitter is an STA and the receiver is an STA; a communication scenario may be: the transmitter is an AP and the receiver is an AP. Transmitter Receiver Transmitter Receiver For ease of understanding and description, the following embodiments are described by taking the example that the transmitter may be an AP and the receiver may be a STA.

[0240] Figure 3 is a flow chart of a communication method 300 provided in an embodiment of the present application, such as Figure 3 As shown, the following steps are included.

[0241] S310, the transmitting end generates a PPDU.

[0242] The PPDU includes a first field, the first field is used to carry a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value.

[0243] Exemplarily, the first sequence may be an LTF sequence, which is used for channel estimation at the receiving end. It should be understood that the first sequence includes a sequence on a pilot subcarrier and a sequence on a non-pilot subcarrier, the sequence on the pilot subcarrier is used for phase tracking and solving phase noise and residual carrier frequency offset problems at the receiving end, and the sequence on the non-pilot subcarrier is used for channel estimation at the receiving end, for example, estimating multiple channels during multi-spatial stream transmission.

[0244] It should be noted that the sequence on the pilot subcarrier is obtained based on the rotation factor, including:

[0245] b) The sequence on the pilot subcarrier is generated according to the spatial mapping matrix. It is expressed as:

[0246] And the first sequence uses a single-stream pilot;

[0247] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ kThe value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number.

[0248] The sequence on the pilot subcarrier is obtained based on the rotation factor and also includes:

[0249] Before b) above, including:

[0250] a) Sequence generation: Generate the basic frequency domain LTF sequence corresponding to the bandwidth of the PPDU.

[0251] After b) above, including:

[0252] c) CSD: CSD is applied to each space-time stream and frequency segment.

[0253] d) Spatial mapping: Apply Q matrix.

[0254] e) IDFT: Calculates the Inverse Discrete Fourier Transform.

[0255] f) GI and windowing: GI is added in front and windowing is applied.

[0256] g) Analog and RF: The resulting complex baseband waveform associated with each transmit chain is up-converted to an RF signal based on the center frequency of the desired channel and then transmitted.

[0257] That is, the sequence on the pilot subcarrier is obtained based on the rotation factor, including but not limited to the following process:

[0258] a) Sequence generation: Generate the basic frequency domain LTF sequence corresponding to the bandwidth of the PPDU.

[0259] b) AHE-LTF matrix mapping: P LTF The matrix is ​​applied to the non-pilot subcarriers of the first sequence and The matrix is ​​applied to the pilot subcarriers of the first sequence. The subsequent implementation methods mainly focus on the processing of the pilot subcarriers in this link.

[0260] c) CSD: CSD is applied to each space-time stream and frequency segment.

[0261] d) Spatial mapping: Apply Q matrix.

[0262] e) IDFT: Calculates the Inverse Discrete Fourier Transform.

[0263] f) GI and windowing: GI is added in front and windowing is applied.

[0264] g) Analog and RF: The resulting complex baseband waveform associated with each transmit chain is up-converted to an RF signal based on the center frequency of the desired channel and then transmitted.

[0265] It should be noted that the rotation factor The value of the rotation factor is greater than or equal to 2, which means that the value of the rotation factor can be multiple, which means that the pilot phase rotation angle θ k There are more than one possible values, or the pilot phase rotation angle θ k The value of is greater than or equal to 2, indicating that the pilot phase rotation angle θ k The value of can be greater than or equal to 2. For example, when the rotation factor In There are two possible values, indicating the pilot phase rotation angle θ k There are two possible values ​​for , for example, k =0, Or θ k =π, For example, when the rotation factor In There are 6 values ​​of, indicating that the pilot phase rotation angle θ k There are 6 possible values ​​of , for example, k =0, Or θ k =π / 3, Or θ k =2π / 3, Or θ k =π, Or θ k =4π / 3, Or θ k =5π / 3, This application is for k , The value of is not limited.

[0266] In one implementation, the sequence on the pilot subcarrier is obtained based on the rotation factor, including: the sequence on the pilot subcarrier is generated according to the spatial mapping matrix, the spatial mapping matrix It is expressed as:

[0267] And the first sequence uses a single-stream pilot;

[0268] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θk The value of is a discrete value or a continuous value between 0 and 2π, KPilot represents the position index set of the pilot subcarrier, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number, such as α k =1.

[0269] In another implementation, the first sequence is generated according to a spatial mapping matrix. It is expressed as:

[0270]

[0271] in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols in the first sequence, α k is a real number, such as α k =1,P LTF The spatial mapping matrix corresponding to the sequence on the non-pilot subcarriers in the first sequence is represented.

[0272] For example, θ k The value of is any of the following: {0,3}×π / 3; or, θ k The value of is any of the following: {0,1,2,3,4,5}×π / 3; or, θ k The value of is any of the following: {0,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5}×π / 3.

[0273] It should be understood that the present application uses the pilot phase rotation angle θ k The value of is not limited. Based on the above scheme, by designing multiple pilot phases θ k In other words, by designing the values ​​of multiple rotation factors, the corresponding values ​​of the sequences on the multiple pilot subcarriers are obtained to reduce the PAPR of the first sequence over the entire bandwidth, improve the problem of excessive PAPR when the low-frequency first sequence is multiplexed to the high-frequency millimeter wave, and ensure the system transmission performance.

[0274] It should be understood that the LTF sequence can be divided into 1x sequence, 2x sequence and 4x sequence according to the number of zero elements between two non-zero elements. Among them, there are 3 zero elements between two non-zero elements of the 1x LTF sequence, 1 zero element between two non-zero elements of the 2x LTF sequence, and 4x LTF sequence is continuous non-zero elements. Among them, because the non-zero elements in the 4x LTF sequence are the most dense, the channel estimation result obtained by using the 4x LTF sequence for channel estimation is more accurate.

[0275] In the following, the first bandwidth, the second bandwidth, and the third bandwidth are taken as the bandwidth of the PPDU as examples to specifically describe the design method of the pilot phase rotation angle (or pilot phase) corresponding to the pilot part in the LTF sequence of the PPDU.

[0276] Exemplarily, the PPDU may be transmitted using a first bandwidth, which is a bandwidth at a high frequency. For example, the first bandwidth may be a bandwidth of 20 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0277] (i) LTF sequence of the PPDU of the first bandwidth.

[0278] In the first implementation, when the bandwidth of the PPDU is the first bandwidth, the position index set of the LTF sequence is {-28, -27, ..., 0, ..., 27, 28}, and the position index set of the pilot subcarrier is {-21, -7, 7, 21}, indicating that there are 4 pilot positions in total.

[0279] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 4 In this case, the pilot phase rotation angle with a lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or {0,0,0,3}×π / 3, or {3,3,3,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3, or {3,3,3,0}×π / 3, and the corresponding PAPR is 5.3426dB.

[0280] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 4 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or {2,2,2,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3, and the corresponding PAPRs are all 5.3426dB.

[0281] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 4In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3, or {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or {2,2,2,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0}×π / 3, and the corresponding PAPR is 4.1904dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3}×π / 3; {3,3,3,0}×π / 3; {1,1,1,4}×π / 3; {4,4,4,1}×π / 3; {5,5,5,2}×π / 3; or, {2,2,2,5}×π / 3, and the corresponding PAPRs are all 5.3426dB.

[0282] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.1904dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.6075dB. In the above three examples, when the LTF is transmitted using a single-stream pilot, the pilot phase provided by the present application will not cause an increase in the PAPR; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase provided by the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, and ensure low PAPR performance during multi-spatial stream transmission.

[0283] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0284] (ii) 2xLTF sequence of the PPDU of the first bandwidth.

[0285] In the second implementation, when the bandwidth of the PPDU is the first bandwidth, the position index set of the 2xLTF sequence of the PPDU is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, indicating that there are 8 pilot positions in total.

[0286] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 8 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,0,0,0}×π / 3, or {0,0,0,0,3,3,0,0}×π / 3; or {0,0,0,0,0,0,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0,3,0,0,0}×π / 3, and the corresponding PAPR is 4.3610dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,3,0,0}×π / 3; or, {0,0,0,0,0,0,3,3}×π / 3, and the corresponding PAPR is 5.1933dB.

[0287] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 8In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {0,0,0,0,3,0,0,0}×π / 3, or {3,3,4,4,1,1,3,3}×π / 3; {4,4,5,5,2,2,4,4}×π / 3; {0,0,1,1,4,4,0,0}×π / 3; {2,2,3,3,0,0,2,2}×π / 3; {5,5,0,0,3,3,5,5}×π / 3{1,1,2,2,5,5,1,1}×π / 3;{4,4,3,3,0,0,4,4}×π / 3;{0,0,5,5,2,2,0,0}×π / 3;{1,1,0,0,3,3,1,1}×π / 3;{2,2,1,1,4,4,2,2}×π / 3;{3,3,2,2,5,5,3,3}×π / 3;or, {5,5,4,4,1,1,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,0,3,0,0,0}×π / 3, and the corresponding PAPR is 4.3610dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,4,4,1,1,3,3}×π / 3; {4,4,5,5,2,2,4,4}×π / 3; {0,0,1,1,4,4,0,0}×π / 3; {2,2,3,3,0,0,2,2}×π / 3; {5,5,0,0,3,3,5,5}×π / 3{1,1,2,2,5,5,1,1}×π / 3; {4,4,3,3,0,0,4,4}×π / 3; {0,0,5,5,2,2,0,0}×π / 3; {1,1,0,0,3,3,1,1}×π / 3; {2,2,1,1,4,4,2,2}×π / 3; {3,3,2,2,5,5,3,3}×π / 3; or, {5,5,4,4,1,1,5,5}×π / 3, the corresponding PAPR is 4.9648dB.

[0288] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 8In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {4.5, 3, 5, 5.5, 0.5, 5.5, 0, 0} × π / 3; or, {1.5, 3, 1, 0.5, 5.5, 0.5, 0, 0} × π / 3, or, {5.5, 0, 0.5, 0.5, 3.5, 3.5, 5.5, 5.5} × π / 3; {2. 5,3,3.5,3.5,0.5,0.5,2.5,2.5}×π / 3; {3.5,4,4.5,4.5,1.5,1.5,3.5,3.5}×π / 3; {4.5,5,5.5,5.5,2.5,2.5,4.5,4.5}×π / 3; {0.5,0,5.5,5.5,2.5,2.5,0.5, 0.5}×π / 3; {0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3; {1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3; {1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3; {4.5,4,3.5,3.5, {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3; {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3; or, {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4.5, 3, 5, 5.5, 0.5, 5.5, 0, 0} × π / 3; or, {1.5, 3, 1, 0.5, 5.5, 0.5, 0, 0} × π / 3, and the corresponding PAPR is 4.2260 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7, or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {5.5, 0, 0.5, 0.5, 3.5, 3.5, 5.5, 5.5} × π / 3; {2.5, 3, 3.5, 3.5, 0.5, 0.5, 2.5, 2.5} × π / 3; {3.5, 4, 4.5, 4.5, 1.5, 1.5, 3.5, 3.5} × π / 3; {4.5, 5, 5.5, 5.5, 2.5 ,2.5,4.5,4.5}×π / 3;{0.5,0,5.5,5.5,2.5,2.5,0.5,0.5}×π / 3;{0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3;{1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3;{1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3;{ 4.5,4,3.5,3.5,0.5,0.5,4.5,4.5}×π / 3; {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3; {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3; or, {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3, and the corresponding PAPR is 4.9595dB.

[0289] It should be noted that for the 2xLTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.8678dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.2395dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0290] Based on the above scheme, by designing different pilot phase rotation angles θ k, so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0291] (iii) 4xLTF sequence of PPDU of the first bandwidth.

[0292] In a third implementation, when the bandwidth of the PPDU is the first bandwidth, the position index set of the 4xLTF sequence of the PPDU is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, indicating that there are 8 pilot positions in total.

[0293] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 8 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,0,0,3,0,0}×π / 3, or {0,3,3,3,3,3,0,0}×π / 3; or {3,0,0,0,0,0,0,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,3,3,0,0,3,0,0}×π / 3, and the corresponding PAPR is 4.5930dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,3,3,3,0,0}×π / 3; or, {3,0,0,0,0,0,3,3}×π / 3, and the corresponding PAPR is 5.3274dB.

[0294] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 8In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {0,2,3,0,0,3,0,0}×π / 3, or {5,0,1,1,1,1,3,2}×π / 3; {0,1,2,2,2,2,4,3}×π / 3; {2,3,4,4,4,4,0,5}×π / 3; {1,2,3,3,3,3,5,4}×π / 3; {3,4,5,5,5,5,1,0}×π / 3; {4,5,0,0,0,0,2,1}×π / 3; {0,5,4,4,4,4,2,3}×π / 3; {1,0,5,5,5,5,3,4}×π / 3; {3,2,1,1,1,1,5,0}×π / 3; {4,3,2,2,2,2,0,1}×π / 3; {2,1,0,0,0,0,4,5}×π / 3; or, {5,4,3,3,3,0,1,2}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,2,3,0,0,3,0,0}×π / 3, and the corresponding PAPR is 4.5375dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {5,0,1,1,1,1,3,2}×π / 3; {0,1,2,2,2,2,4,3}×π / 3; {2,3,4,4,4,4,0,5}×π / 3; {1,2,3,3,3,3,5,4}×π / 3; {3,4,5,5,5,5,1,0}×π / 3; {4,5,0,0,0,0,2,1}×π / 3; {0,5,4,4,4,4,2,3}×π / 3; {1,0,5,5,5,5,3,4}×π / 3; {3,2,1,1,1,1,5,0}×π / 3; {4,3,2,2,2,2,0,1}×π / 3; {2,1,0,0,0,0,4,5}×π / 3; or, {5,4,3,3,3,0,1,2}×π / 3, the corresponding PAPR is 5.2348dB.

[0295] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 8In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, or, {1, 0.5, 1, 0.5, 0, 1.5, 3.5, 0} × π / 3; {2, 1.5, 2, 1.5, 1, 2.5, 4.5, 1} × π / 3; {0, 5.5, 0, 5.5, 5, 0.5, 2.5, 5} × π / 3; {3, 2.5, 3, 2.5, 2, 3.5, 3.5, 2} × π / 3; {4, 3.5, 4, 3.5 ,3,4.5,0.5,3}×π / 3{5,4.5,5,4.5,4,5.5,1.5,4}×π / 3;{5,5.5,5,5.5,0,4.5,2.5,0}×π / 3;{0,0.5,0,0.5,1,5.5,3.5,1}×π / 3;{1,1.5,1,1.5,2,0.5,4.5,2}×π / 3;{2,2.5,2,2.5,3,1.5,5.5,3}×π / 3;{3,3.5,3,3.5,4,2.5,0.5,4}×π / 3;or, {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, and the corresponding PAPR is 4.4794 dB; Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {5.5, 1.5, 1, 3, 0.5, 1.5, 3.5, 3} × π / 3; or, {0.5, 4.5, 5, 3, 5.5, 4.5, 2.5, 3} × π / 3, and the corresponding PAPR is 4.4794 dB. The number of intermediate streams can be multiple, such as 1, 2, 3, 4, 5, 6, 7 or 8, then the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1, 0.5, 1, 0.5, 0, 1.5, 3.5, 0} × π / 3; {2, 1.5, 2, 1.5, 1, 2.5, 4.5, 1} × π / 3; {0, 5.5, 0, 5.5, 5, 0.5, 2.5, 5} × π / 3; { 3,2.5,3,2.5,2,3.5,3.5,2}×π / 3; {4,3.5,4,3.5,3,4.5,0.5,3}×π / 3{5,4.5,5,4.5,4,5.5,1.5,4}×π / 3; {5,5.5,5,5.5,0,4.5,2.5,0}×π / 3; {0,0.5,0,0.5,1,5.5,3.5,1}× π / 3; {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3; {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3; {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3; or, {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3, and the corresponding PAPR is 5.1680dB.

[0296] It should be noted that for the 4xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 4.8262dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.3647dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the first bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0297] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0298] Exemplarily, the PPDU may be transmitted using a second bandwidth, which is a bandwidth at a high frequency. For example, the second bandwidth may be a bandwidth of 40 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0299] (iv) LTF sequence of the PPDU of the second bandwidth.

[0300] In a fourth implementation, when the bandwidth of the PPDU is the second bandwidth, the position index set of the LTF sequence of the PPDU is {-58, -57, ..., 0, ..., 57, 58}, and the position index set of the pilot subcarrier is {-35, -25, -11, 11, 25, 35}, indicating that there are 6 pilot positions in total.

[0301] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 6 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,3,3,0}×π / 3, or {0,3,0,3,0,3}×π / 3; or {3,0,3,0,3,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,3,0,3,3,0}×π / 3, and the corresponding PAPR is 5.8211dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,0,3,0,3}×π / 3; or, {3,0,3,0,3,0}×π / 3, and the corresponding PAPR is 6.6342dB.

[0302] Below, taking the first sequence in the first example using a single-stream pilot transmission scenario as an example, the specific implementation method for determining the pilot phase rotation angle corresponding to the pilot subcarrier is introduced. The bandwidth of other different low-frequency bandwidths after the clock is used as the bandwidth of the PPDU, and the design of the corresponding LTF sequence pilot phase rotation angle of the PPDU is similar. For the sake of brevity, it will not be described in detail.

[0303] The existing LTF sequence of 802.11ac 40MHz PPDU is:

[0304] VHT-LTF -58,58={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,-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,-1,0, ,-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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1,1}.

[0305] Since the position index set of the pilot subcarrier of the LTF sequence is {-35, -25, -11, 11, 25, 35}, after performing a phase rotation of {0, 3} × π / 3 (i.e., the pilot phase rotation angle can be 0 or π) on the sequence on the pilot subcarrier, the LTF sequence PAPR results in 64 cases as shown in Table 1 below can be obtained.

[0306] Table 1

[0307]

[0308]

[0309]

[0310] It should be understood that the sequence on the pilot subcarrier of the LTF sequence of the 40MHz PPDU is {0,3}×π / 3 (ie, the pilot phase rotation angle θ k Before the phase rotation of 0 or π), the PAPR value is 7.0352dB. As can be seen from Table 1, after the existing LTF sequence undergoes the above pilot phase rotation, the PAPR value corresponding to the LTF sequence in 52 cases is less than 7.0352dB, and the PAPR performance is significantly improved, which can effectively ensure the accuracy of the channel estimation at the receiving end.

[0311] Among them, in the 55th case, the pilot phase rotation angle corresponding to the pilot subcarrier is {3,3,0,3,3,0}×π / 3, which means that the pilot phase rotation angles of the six sequence values ​​on the pilot subcarrier in the LTF sequence during spatial mapping are π,π,0,π,π,0 respectively. At this time, the LTF sequence after phase rotation is:

[0312] VHT-LFT -58,58={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,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1,-1,-1,-1,1,1,-1,-1,-1,0 ,0,0,-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,-1,-1,1,1,1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,1,-1,1,1,1}.

[0313] Obviously, in the above Table 1, the PAPR value of the LTF sequence after phase rotation in the 55th case is the smallest, which is 5.8211298dB. Compared with the PAPR value of the LTF sequence before phase rotation, it is reduced by 1.2141dB, that is, the PAPR value is reduced by 17.26%, achieving a high performance improvement. This makes the receiving end most effective when performing phase tracking according to the sequence on the pilot subcarrier, and thus the channel estimation result is more accurate.

[0314] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 6In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {4,2,0,3,2,0}×π / 3, or {1,4,1,4,0,3}×π / 3; {2,5,2,5,1,4}×π / 3; {3,0,3,0,2,5}×π / 3; {5,2,5,2,4,1}×π / 3; {0,3,0,3,5,2} ×π / 3; {4,1,4,1,3,0}×π / 3; {1,4,1,4,2,5}×π / 3; {0,3,0,3,1,4}×π / 3; {5,2,5,2,0,3}×π / 3; {2,5,2,5,3,0}×π / 3; {4,1,4,1,5,2}×π / 3; or, {3,0,3,0,4,1}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {4, 2, 0, 3, 2, 0} × π / 3; or, {2, 4, 0, 3, 4, 3} × π / 3, and the corresponding PAPR is 5.8001dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1, 4, 1, 4, 0, 3} × π / 3; {2, 5, 2, 5, 1, 4}×π / 3; {3,0,3,0,2,5}×π / 3; {5,2,5,2,4,1}×π / 3; {0,3,0,3,5,2}×π / 3; {4,1,4,1,3,0}×π / 3; {1,4,1,4,2,5}×π / 3; {0,3,0,3,1,4}×π / 3; {5,2,5,2,0,3}×π / 3; {2,5,2,5,3,0}×π / 3; {4,1,4,1,5,2}×π / 3; or, {3,0,3,0,4,1}×π / 3, the corresponding PAPR is 6.6342dB.

[0315] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 6In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {2.5, 4.5, 0.5, 3, 4, 0} × π / 3; or, {3.5, 1.5, 5.5, 3, 2, 0} × π / 3, or, {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; or, {4.5, 1.5, 3, 0, 5.5, 3} × π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {2.5, 4.5, 0.5, 3, 4, 0} × π / 3; or, {3.5, 1.5, 5.5, 3, 2, 0} × π / 3, and the corresponding PAPR is 5.6738 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, then The pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; {1.5, 4.5, 3, 0, 0.5, 3} × π / 3; {4.5, 1.5, 0, 3, 3.5, 0} × π / 3; or, {4.5, 1.5, 3, 0, 5.5, 3} × π / 3, and the corresponding PAPR is 6.4748 dB.

[0316] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 7.0352dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 7.0352dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided by the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy.

[0317] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0318] (V) 2xLTF sequence of the PPDU of the second bandwidth.

[0319] In the fifth implementation, when the bandwidth of the PPDU is the second bandwidth, the position index set of the 2xLTF sequence of the PPDU is {-244, -243, …, 0, …, 243, 244}, and the pilot position index set corresponding to the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, indicating that there are 16 pilot positions in total.

[0320] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 16 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, or {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3; or {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, and the corresponding PAPR is 4.9279dB; optionally, if the number of spatial streams of the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3; or, {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3, and the corresponding PAPR is 5.7861dB.

[0321] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 16In these cases, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, or {3,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3; {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3; {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3; or {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3, and the corresponding PAPR is 4.9279dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3 ,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3; {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3; {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3; or, {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3, the corresponding PAPR is 5.7302 dB.

[0322] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,5.5,5.5,0,2.5,3.5,3.5,5.5,0,2.5,3,0,3,5.5,2.5,3.5}×π / 3; or, {3,0.5,0.5,0,3.5,2.5,2.5,0.5,0,3.5,3,0,3,0.5,3.5,2.5}×π / 3, or, {2.5,4,4,4.5,1.5,2,0,0.5,3.5,4,1.5, =0.5,0.5,0,2,2}×π / 3; {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3; {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3; or, {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 5.5, 5.5, 0, 2.5, 3.5, 3.5, 5.5, 0, 2.5, 3, 0, 3, 5.5, 2.5, 3.5} × π / 3; or, {3, 0.5, 0.5, 0, 3.5, 2.5, 2.5, 0.5, 0, 3.5, 3, 0, 3, 0.5, 3.5, 2.5} × π / 3, and the corresponding PAPR is 4.8778 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {2.5,4,4,4.5,1.5,2,0,0.5,3.5,4,1.5,0.5,0.5,0,2,2}×π / 3; {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3; {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3; or {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3, and the corresponding PAPR is 5.6206 dB.

[0323] It should be noted that for the 2xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 5.8114dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.8377dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0324] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0325] (vi) 4xLTF sequence of the PPDU of the second bandwidth.

[0326] In a sixth implementation, when the bandwidth of the PPDU is the second bandwidth, the position index set of the 4xLTF sequence of the 40MHz PPDU is {-244, -243, …, 0, …, 243, 244}, and the position index set of the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, indicating that there are 16 pilot positions in total.

[0327] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 16In these cases, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3, {0,0,0,0,3,3,3,3,0,0,0,0,0,0,3,3}×π / 3, or {3,3,3,3,0,0,0,0,3,3,3,3,3,3,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3, and the corresponding PAPR is 4.8160dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,3,3,3,0,0,0,0,0,3,3}×π / 3; or, {3,3,3,3,0,0,0,0,3,3,3,3,3,3,0,0}×π / 3, and the corresponding PAPR is 5.3146dB.

[0328] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3; or, {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3, {5,0,0,1,3,3,4,3,0,1,5,5 ,5,5,3,3}×π / 3; {1,0,0,5,3,3,2,3,0,5,1,1,1,1,3,3}×π / 3; {2,3,3,4,0,0,1,0,3,4,2,2,2,2,0,0}×π / 3; or, {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3; or, {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3, and the corresponding PAPR is 4.7941dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {5,0,0,1,3,3,4,3,0,1,5,5,5,5,3,3}×π / 3; {1,0,0,5,3,3,2,3,0,5,1,1,1,1,3,3}×π / 3; {2,3,3,4,0,0,1,0,3,4,2,2,2,2,0,0}×π / 3; or, {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3, and the corresponding PAPR is 5.2597 dB.

[0329] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3.5, 3, 1.5, 1.5, 3.5, 5, 2.5, 0.5, 0, 1, 5.5, 3, 3.5, 5.5, 5.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5, 3, 2.5, 0.5, 0.5, 0} × π / 3; or, {3.5, 3.5, 2.5, 1.5, 0.5, 5.5, 4.5, 5.5, 2.5, 2, 3.5, 3.5, 4.5, ={0.5,0.5,5.5,4.5,3.5,2.5,1.5,2.5,5.5,5,0.5,0.5,1.5,1,3,3}×π / 3; or, {2.5,2.5,3.5,4.5,5.5,0.5,1.5,0.5,3.5,4,2.5,2.5,1.5,2,0,0}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3.5, 3, 1.5, 1.5, 3.5, 5, 2.5, 0.5, 0, 1, 5.5, 3, 3.5, 5.5, 5.5, 0} × π / 3; or, {2.5, 3, 4.5, 4.5, 2.5, 1, 3.5, 5.5, 0, 5, 0.5, 3, 2.5, 0.5, 0.5, 0} × π / 3, and the corresponding PAPR is 4.7217 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3.5, 3 .5,2.5,1.5,0.5,5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3; {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3; {0.5,0.5,5.5, The PAPR of the networks is 4.5,3.5,2.5,1.5,2.5,5.5,5,0.5,0.5,1.5,1,3,3}×π / 3; or, {2.5,2.5,3.5,4.5,5.5,0.5,1.5,0.5,3.5,4,2.5,2.5,1.5,2,0,0}×π / 3, and the corresponding PAPR is 5.1970dB.

[0330] It should be noted that for the 4xLTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 5.2466dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 5.4693dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the second bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0331] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0332] Exemplarily, the PPDU may be transmitted using a third bandwidth, which is a bandwidth at a high frequency. For example, the third bandwidth may be a bandwidth of 80 MHz after being clocked 4 times, 8 times, or 16 times, which may be used for low-complexity high-frequency millimeter wave communications, and this application does not limit this.

[0333] (VII) LTF sequence of the PPDU of the third bandwidth.

[0334] In the seventh implementation, when the bandwidth of the PPDU is the third bandwidth, the position index set of the LTF sequence of the PPDU is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-103, -75, -39, -11, 11, 39, 75, 103}, indicating that there are 8 pilot positions in total.

[0335] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 8In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {0,0,0,3,3,3,3,3}×π / 3, or {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,3,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,0,3,3,3,3,3}×π / 3, and the corresponding PAPR is 8.5338dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0 ,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPRs are all 9.4170dB.

[0336] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 8In these cases, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {0,0,0,3,3,2,3,4}×π / 3; or, {0,1,0,4,3,4,3,2}×π / 3, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0,3,0,3,3,0}×π / 3; {3,0,0,3,0,3,3,0,0}×π / 3; {3,0,0,3,0,3,3,0,0}×π / 3; {0,3,3,0 ={3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,0}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.

[0337] Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,2,3,4}×π / 3; or, {0,1,0,4,3,4,3,2}×π / 3, and the corresponding PAPR is 8.4175dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4 , 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3,0,0 ,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3 ,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPR are all 9.4170dB.

[0338] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 8 In this case, the pilot phase rotation angle with a lower PAPR can be obtained by traversing. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following:

[0339] {0,4.5,0,0.5,3,3,3,3}×π / 3, {0,1.5,0,3,3,3,3,3}×π / 3, {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,3,0}×π / 3; {3,0,0,3,0,3,3,0,3}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; {3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3.

[0340] Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0, 4.5, 0, 0.5, 3, 3, 3, 3} × π / 3; or, {0, 1.5, 0, 3, 3, 3, 3, 3} × π / 3, and the corresponding PAPR is 8.4035 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7, or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,3,0,0,3,0,0,3}×π / 3; {0,0,3,3,0,3,3,0}×π / 3; {3,3,0,3,0,0,3,0}×π / 3; {3,0,3,0,3,3,0,3}×π / 3; {0,3,3,0,3,0,0,3}×π / 3; {3, 0,0,3,0,3,3,0}×π / 3; {3,0,0,3,3,3,0,0}×π / 3; {0,3,3,0,0,0,3,3}×π / 3; {3,3,0,0,0,3,3,0}×π / 3; {3,3,0,0,3,3,0,0}×π / 3; {0,0,3,3,0,0,3,3}×π / 3; {0,0,3,3,3,0,0,3}×π / 3; { 3,3,3,0,0,0,3,3}×π / 3; {3,0,0,3,3,0,0,3}×π / 3; {3,3,3,0,3,3,3,0}×π / 3; {0,0,3,3,3,3,0,0}×π / 3; {0,0,3,0,0,0,3}×π / 3; or, {0,3,3,0,0,3,3,0}×π / 3, the corresponding PAPRs are all 9.4170dB.

[0341] It should be noted that for the LTF sequence of the existing PPDU, when the LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 10.1412dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 10.1412dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0342] Based on the above scheme, by designing different pilot phase rotation angles θ k, so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0343] (VIII) 2xLTF sequence of the PPDU of the third bandwidth.

[0344] In an eighth implementation, when the bandwidth of the PPDU is the third bandwidth, the position index set of the 2xLTF sequence of the PPDU is {-500, -499, …, 0, …, 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, indicating that there are 16 pilot positions in total.

[0345] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 16 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3, or {3,0,3,0,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3; or {0,3,0,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3, and the corresponding PAPR is 5.3096dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3; or, {0,3,0,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3, and the corresponding PAPR is 5.8976dB.

[0346] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3; or, {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3; or, {2,1,3,1,1,1,0,1,1,1,1, or, {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3; or, {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3, and the corresponding PAPR is 5.2543dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {2,1,3,1,1,1,0,1,1,1,1,0,3,3,2,0}×π / 3; {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3; {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3; or, {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3, and the corresponding PAPR is 5.8324dB.

[0347] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {0.5, 0.5, 2, 0.5, 2.5, 0.5, 3, 2.5, 1.5, 0.5, 0, 3, 3.5, 0.5, 3, 0} × π / 3; or, {5.5, 5.5, 4, 5.5, 3.5, 5.5, 3, 3.5, 4.5, 5.5, 0, 3, 2.5, 5.5, 3, 0} × π / 3, {2, 1, 2.5, 0.5, 1.5, 1.5, 0, 0.5, 0.5, 1, 1, 0 ,3,2.5,0.5,0}×π / 3; {4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3; {5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3, or, {1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0.5, 0.5, 2, 0.5, 2.5, 0.5, 3, 2.5, 1.5, 0.5, 0, 3, 3.5, 0.5, 3, 0} × π / 3; or, {5.5, 5.5, 4, 5.5, 3.5, 5.5, 3, 3.5, 4.5, 5.5, 0, 3, 2.5, 5.5, 3, 0} × π / 3, and the corresponding PAPR is 5.2159 dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is The angle is any of the following: {2,1,2.5,0.5,1.5,1.5,0,0.5,0.5,1,1,0,3,2.5,0.5,0}×π / 3; {4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3; {5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3; or {1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3, and the corresponding PAPR is 5.7885 dB.

[0348] It should be noted that for the 2xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 6.0060dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 6.0766dB. In the above three examples, regardless of the number of spatial streams of the LTF sequence, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve channel estimation accuracy. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0349] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0350] (ix) 4xLTF sequence of PPDU of the third bandwidth.

[0351] In the ninth implementation, when the bandwidth of the PPDU is the third bandwidth, the position index set of the 4xLTF sequence of the PPDU is {-500, -499, …, 0, …, 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, indicating that there are 16 pilot positions in total.

[0352] In the first example, when the pilot phase rotation angle at each pilot position is any of the following: {0,3}×π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 2 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3, or {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3; or {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3. Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3, and the corresponding PAPR is 5.8772dB; optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3; or, {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3, and the corresponding PAPRs are all 6.2356dB.

[0353] In the second example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 1, 2, 3, 4, 5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 6 16 In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3; or, {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3, {3,5,0,4,3,5,0,0,3,5,0,4 ,3,5,0,0}×π / 3; {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3; {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3; or, {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3.

[0354] Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3; or, {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3, and the corresponding PAPR is 5.8735dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot subcarrier The pilot phase rotation angle corresponding to the subcarrier is any of the following: {3,5,0,4,3,5,0,0,3,5,0,4,3,5,0,0}×π / 3; {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3; {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3; or, {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3, and the corresponding PAPR is 6.2232dB.

[0355] In the third example, when the pilot phase rotation angle at each pilot position is any of the following: {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5} × π / 3, the pilot phase rotation angle corresponding to the pilot subcarrier is 12 16In this case, the pilot phase rotation angle with lower PAPR can be obtained by traversal. For example, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3, 0, 3.5, 5.5, 0.5, 0.5, 2.5, 3, 0, 0, 3.5, 3.5, 0.5, 0.5, 2.5, 3} × π / 3; or, {3, 0, 2.5, 0.5, 5.5, 5.5, 3.5, 3, 0, 0, 2.5, 2.5, 5.5, 5.5, 3.5, 3} × π / 3, Or, {3,4.5,5.5,4,2.5,4.5,0,0,3,4.5,0,4,3,4.5,5.5,0}×π / 3; {3.5,5.5,5.5,4.5,3,5,0,0,3.5,5.5,0,4.5,3.5,5,5.5,0}×π / 3; {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2, 3,1.5,0.5,0}×π / 3; {2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3; {0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3; {0.5,2.5,2.5,1.5,0,2, 3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3; {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3; or, {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3.Optionally, if the number of spatial streams used to transmit the first sequence is 1, the pilot phase rotation angle corresponding to the pilot subcarrier is any of the following: {3, 0, 3.5, 5.5, 0.5, 0.5, 2.5, 3, 0, 0, 3.5, 3.5, 0.5, 0.5, 2.5, 3} × π / 3; or, {3, 0, 2.5, 0.5, 5.5, 5.5, 3.5, 3, 0, 0, 2.5, 2.5, 5.5, 5.5, 3.5, 3} × π / 3, and the corresponding PAPRs are 5.8562dB; Optionally, if the number of spatial streams used to transmit the first sequence can be multiple, for example, 1, 2, 3, 4, 5, 6, 7 or 8, the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3, 4.5, 5.5, 4, 2.5, 4.5, 0, 0, 3, 4.5, 0, 4, 3, 4.5, 5.5, 0} × π / 3; {3.5, 5.5, 5.5, 4.5, 3, 5, 0, 0, 3.5, 5.5, 0, 4.5, 3.5, 5, 5 .5,0}×π / 3; {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2,3,1.5,0.5,0}×π / 3; {2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3; {0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3; {0.5,2. The PAPR of the network is 6.2037dB for the following examples: 5,2.5,1.5,0,2,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3; {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3; or {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3, and the corresponding PAPR is 6.2037dB for the following examples:

[0356] It should be noted that for the 4xLTF sequence of the existing PPDU, when LTF is transmitted using a single-stream pilot, the corresponding PAPR value is 6.1788dB; when the number of spatial streams of the LTF sequence is 1, 2, 3, 4, 5, 6, 7 or 8, the corresponding PAPR value is 6.2851dB. It can be seen that in the above three examples, no matter how many spatial streams the LTF sequence has, the pilot phase provided in the present application can reduce the PAPR of the LTF sequence under the third bandwidth resource, as well as ensure low PAPR performance during single-stream transmission and multi-spatial stream transmission, and improve the accuracy of channel estimation. In addition, as the value of the pilot phase rotation angle increases, the smaller the corresponding PAPR value, the higher the gain, and the more accurate the channel estimation result.

[0357] Based on the above scheme, by designing different pilot phase rotation angles θ k , so that the first sequence has a lower PAPR over the entire bandwidth. In addition, for the scenario of single-stream transmission or multi-spatial-stream transmission, the first sequence also has a lower PAPR, which can ensure the transmission performance of the entire system.

[0358] In the above, the design of the pilot phase rotation angle (or pilot phase) corresponding to the pilot part in the LTF sequence of the PPDU is described by taking the first bandwidth, or the second bandwidth, or the third bandwidth as the bandwidth of the PPDU as an example. This is only an example given for easy understanding. In this embodiment, the specific size of the bandwidth before the clock is not limited. For example, it can be 60 MHz. At this time, the design method of the pilot phase corresponding to the pilot part in the LTF sequence of the PPDU with a bandwidth of 60 MHz after the clock (for example, the fourth bandwidth) can refer to the above implementation method, and examples will not be given one by one here.

[0359] S320, the transmitting end sends the PPDU to the receiving end, and correspondingly, the receiving end receives the PPDU from the transmitting end.

[0360] For example, taking the case where the transmitting end may be an AP and the receiving end may be an STA, the STA may be any one of one or more STAs. In this embodiment, no limitation is imposed on the transmission mode of the PPDU, and the description of the PPDU transmission mode between the AP and the STA specified in the existing protocol or future protocol may be referred to, which will not be described in detail here.

[0361] In an example, the transmitting end is an AP and the receiving end is an STA, and the AP can send downlink information (such as downlink data) to the STA based on the frequency resources.

[0362] In another example, the transmitting end is a STA and the receiving end is an AP, and the STA can send uplink information (such as uplink data) to the AP based on the frequency resource.

[0363] Optionally, the transmitting end is an AP and the receiving end is an AP; or, the transmitting end is an STA and the receiving end is an STA, which is not limited in this application.

[0364] It should be noted that, in this embodiment, for the sake of convenience of description, the two parties in communication are referred to as AP and STA, but it should be understood that the names of the communication devices in this embodiment are not limited, as long as they can achieve the corresponding functions. For example, AP can be replaced by access point, base station or terminal device, etc., and STA can be replaced by non-AP site, non-AP STA, user, terminal device, etc., and examples are not given one by one here.

[0365] S330: The receiving end performs phase tracking according to the sequence on the pilot subcarrier.

[0366] It should be understood that the receiving end obtains the first sequence after receiving the PPDU parsing, and uses the sequence on the pilot subcarrier in the first sequence for phase tracking, for example, using the pilot phase corresponding to the same pilot subcarrier in two adjacent OFDM symbols divided by time. The specific implementation of phase tracking and channel estimation can refer to the existing solution and will not be described in detail here.

[0367] Based on the above technical solution, by designing the rotation factor And the value of the extended conversion factor is such that the value of the pilot phase rotation angle includes not only 0 and π, but can be extended to more pilot phases. Correspondingly, the value of the sequence on the pilot subcarrier in the first sequence includes not only ±1, but can be extended to This implementation is suitable for multiplexing the channel estimation sequence used for low frequency into the high frequency millimeter wave scenario, which can reduce the PAPR of the first sequence over the entire bandwidth and improve the transmission performance. At the same time, this implementation changes the pilot phase rotation angle corresponding to the sequence on the pilot subcarrier, and does not affect the effect of the phase tracking by the receiving end using the sequence on the pilot subcarrier to meet the lower PAPR required by the high frequency PA.

[0368] It should be understood that the sequence numbers of the above processes do not mean the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present application.

[0369] It should also be understood that in the various embodiments of the present application, unless otherwise specified or there is a logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other, and the technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0370] It should also be understood that in some of the above embodiments, the devices in the existing network architecture are mainly used as examples for exemplary description, and it should be understood that the embodiments of the present application do not limit the specific form of the devices. For example, devices that can achieve the same function in the future are applicable to the embodiments of the present application.

[0371] It can be understood that in the above-mentioned various method embodiments, the methods and operations implemented by devices (such as AP and STA) can also be implemented by components (such as chips or circuits) that can be used in devices.

[0372] It can also be understood that in each embodiment of the present application, the interaction between AP and STA is mainly used as an example for illustrative description, and the present application is not limited to this. AP can be replaced by a sending device, and the sending device can be a network device or a terminal device; STA can be replaced by a receiving device, and the receiving device can be a network device or a terminal device.

[0373] It can also be understood that some optional features in the embodiments of the present application may not depend on other features in some scenarios, or may be combined with other features in some scenarios, without limitation.

[0374] The method embodiment of the present application is described above, and the corresponding device embodiment is briefly introduced below. It should be understood that the description of the device embodiment corresponds to the description of the method embodiment, so the part not described in detail can refer to the previous method embodiment.

[0375] Figure 4 Schematic diagram of a communication device provided in an embodiment of the present application. Figure 4 As shown, the communication device 1000 may include a transceiver unit 1010 and / or a processing unit 1020. The transceiver unit 1010 may communicate with the outside, and the processing unit 1020 is used to process data / information. The transceiver unit 1010 may also be called a communication interface or a communication unit.

[0376] In a possible implementation, the communication device 1000 may be the transmitting end in the above method 300, or may be a component (e.g., a chip, a chip system, a circuit or a module, etc.) in the transmitting end in the above method 300. The communication device 1000 may implement the process executed by the transmitting end in the above method 300, wherein the processing unit 1020 is used to execute the processing-related operations of the transmitting end in the above method 300, and the transceiver unit 1010 is used to execute the transceiver-related operations of the transmitting end in the above method 300.

[0377] Exemplarily, the processing unit 1020 is used to generate a PPDU, the PPDU includes a first field, the first field is used to carry a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; the transceiver unit 1010 is used to send the PPDU.

[0378] It should be understood that the above content is only for illustrative purposes, and the communication device 1000 can also implement other steps, actions or methods related to the sending end in the above method 300, which will not be repeated here.

[0379] In another possible implementation, the communication device 1000 may be the receiving end in the above method 300, or may be a component (e.g., a chip, a chip system, a circuit or a module, etc.) in the receiving end in the above method 300. The communication device 1000 may implement the process executed by the receiving end in the above method 300, wherein the transceiver unit 1010 is used to perform the transceiver-related operations of the receiving end in the above method 300, and the processing unit 1020 is used to perform the processing-related operations of the receiving end in the above method 300.

[0380] Exemplarily, the transceiver unit 1010 is used to receive a PPDU, the PPDU includes a first field, the first field carries a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; the processing unit 1020 is used to perform phase tracking according to the sequence on the pilot subcarrier.

[0381] It should be understood that the above content is only understood as an example, and the communication device 1000 can also implement other steps, actions or methods related to the receiving end in the above method 300, which will not be repeated here.

[0382] It should be understood that the communication device 1000 herein is embodied in the form of a functional unit. The term "unit" herein may refer to an application specific integrated circuit (ASIC), an electronic circuit, a program product, a processor for executing the program product (e.g., a shared processor, a dedicated processor, or a group processor, etc.), a combined logic circuit, and / or other suitable components that support the described functions.

[0383] The communication device 1000 has the function of implementing the corresponding steps performed by the transmitting end in the method, or the communication device 1000 has the function of implementing the corresponding steps performed by the receiving end in the method. The functions can be implemented by hardware, software, or a combination of hardware and software.

[0384] Figure 5 is another schematic structural diagram of a communication device provided in an embodiment of the present application. Figure 5 As shown, the communication device 2000 includes: at least one processor 2010 and at least one transceiver 2020. Optionally, the communication device 2000 also includes a memory 2030 for storing instructions. The processor 2010 can be coupled with the memory 2030 to execute the instructions stored in the memory 2030 to control the transceiver 2020 to send and / or receive signals.

[0385] In a possible implementation, the communication device 2000 may be the transmitting end in the above method 300, or may be a component (eg, a chip, a chip system, a circuit or a module, etc.) in the transmitting end in the above method 300.

[0386] In one example, the processor 2010 is used to generate a PPDU, the PPDU includes a first field, the first field is used to carry a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; the transceiver 2020 is used to send the PPDU.

[0387] In another possible implementation, the communication device 2000 may be the receiving end in the above method 300, or may be a component (eg, a chip, a chip system, a circuit or a module, etc.) in the receiving end in the above method 300.

[0388] In another example, the transceiver 2020 is used to receive a PPDU, the PPDU includes a first field, the first field carries a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; the processor 2010 is used to perform phase tracking according to the sequence on the pilot subcarrier.

[0389] It should be understood that the above content is only for illustrative purposes. The communication device 2000 can also implement the transmitter, receiver, or other steps, actions or methods related to the transmitter and receiver in the above method 300. For the sake of brevity, they will not be repeated here.

[0390] It should be understood that in the communication device 2000 or the communication device 2200, the processor and the memory can be combined into a processing device, and the processor is used to execute the program code stored in the memory to implement the above functions. In specific implementation, the memory can also be integrated into the processor or independent of the processor.

[0391] It should also be understood that the transceiver 2020 or transceiver 2020 may include a receiver (or receiver) and a transmitter (or transmitter). The transceiver 2020 or transceiver 2020 may further include an antenna, and the number of antennas may be one or more. The transceiver 2020 or transceiver 2020 may be a communication interface or interface circuit.

[0392] The processor mentioned in the embodiments of the present application may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application specific integrated circuits (ASIC), field programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0393] It should also be understood that the memory mentioned in the embodiments of the present application may be a volatile memory and / or a non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, RAM can be used as an external cache. By way of example and not limitation, RAM includes the following forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate synchronous dynamic random access memory (DDR SDRAM), enhanced synchronous dynamic random access memory (ESDRAM), synchronous link dynamic random access memory (SLDRAM), and direct rambus RAM (DR RAM).

[0394] It should be noted that when the processor is a general-purpose processor, DSP, ASIC, FPGA or other programmable logic device, discrete gate or transistor logic device, discrete hardware component, the memory (storage module) can be integrated into the processor.

[0395] It should also be noted that the memory described herein is intended to include, but is not limited to, these and any other suitable types of memory.

[0396] Figure 6 FIG. 3 is a schematic diagram of a chip system 3000 provided in an embodiment of the present application. Figure 6 As shown, the chip system 3000 (or also referred to as a processing system) includes a logic circuit 3010 and an input / output interface (input / output interface) 3020. For example, the chip system 3000 may be a system on chip (SoC). Figure 4 The communication device 1000 may also be Figure 5 The communication device 2000 is shown.

[0397] Among them, the logic circuit 3010 can be a processing circuit in the chip system 3000. The logic circuit 3010 calls the instructions in the storage unit so that the chip system 3000 can implement the methods and functions of each embodiment of the present application. The input / output interface 3020 can be an input / output circuit in the chip system 3000, outputting information processed by the logic circuit 3010, or inputting data or signaling information to be processed into the logic circuit 3010 for processing.

[0398] For example, the logic circuit 3010 is used to generate a PPDU, the PPDU includes a first field, the first field is used to carry a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; the input / output interface 3020 is used to send the PPDU.

[0399] For example, the input / output interface 3020 is used to receive a PPDU, the PPDU includes a first field, the first field carries a first sequence, the first sequence includes a sequence on a pilot subcarrier, the sequence on the pilot subcarrier is obtained based on a rotation factor, and the rotation factor has more than one value; the logic circuit 3010 is used to perform phase tracking according to the sequence on the pilot subcarrier.

[0400] It should be understood that the details of the input / output interface 3020 and the logic circuit 3010 executing the above method have been described in detail in the above method embodiment, and for the sake of brevity, they will not be repeated here.

[0401] According to the method provided in the embodiment of the present application, the present application also provides a computer program product, which includes: computer program code, when the computer program code is run on a computer, the computer executes the method in the above method embodiment.

[0402] According to the method provided in the embodiment of the present application, the present application also provides a computer-readable medium, which stores a program code. When the program code runs on a computer, the computer executes the method in the above method embodiment.

[0403] According to the method provided in the embodiment of the present application, the present application also provides a system, which includes the aforementioned transmitting end and / or receiving end, namely AP and / or STA.

[0404] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0405] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0406] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0407] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0408] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0409] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application can be essentially or partly embodied in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0410] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A communication method, characterized in that: Applied to the sending end, the method includes: Generate a physical layer protocol data unit PPDU, where the PPDU includes a first field, where the first field is used to carry a first sequence, where the first sequence includes a sequence on a pilot subcarrier, where the sequence on the pilot subcarrier is obtained based on a rotation factor, and where the rotation factor has more than one value; The PPDU is sent.

2. The method according to claim 1, characterized in that The sequence on the pilot subcarrier is obtained based on the rotation factor, including: the sequence on the pilot subcarrier is generated according to the spatial mapping matrix, the spatial mapping matrix It is expressed as: And the first sequence uses a single-stream pilot; in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols of the first sequence, α k is a real number.

3. The method according to claim 1, characterized in that The first sequence is generated according to a spatial mapping matrix, and the spatial mapping matrix is ​​expressed as It is expressed as: in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols of the first sequence, α k is a real number, P LTF Represents a spatial mapping matrix corresponding to a sequence on a non-pilot subcarrier in the first sequence.

4. The method according to claim 2 or 3, characterized in that: θ k The value of is any of the following: {0,3}×π / 3; or, θ k The value of is any of the following: {0,1,2,3,4,5}×π / 3; or, θ k The value of is any of the following: {0,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5}×π / 3.

5. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-28, -27, ..., 0, ..., 27, 28}, and the position index set of the pilot subcarrier is {-21, -7, 7, 21}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3； {0,0,0,3}×π / 3； {3,3,3,0}×π / 3； {0,0,0,0}×π / 3； {0,0,0,3}×π / 3； {3,3,3,0}×π / 3； {1,1,1,4}×π / 3； {4,4,4,1}×π / 3； {5,5,5,2}×π / 3； {2,2,2,5}×π / 3； {0,0,0,0}×π / 3； {0,0,0,3}×π / 3； {3,3,3,0}×π / 3； {1,1,1,4}×π / 3； {4,4,4,1}×π / 3； {5,5,5,2}×π / 3； {2,2,2,5}×π / 3。 6. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0,3,0,0,0}×π / 3； {0,0,0,0,3,3,0,0}×π / 3； {0,0,0,0,0,0,3,3}×π / 3； {0,0,0,0,3,0,0,0}×π / 3； {3,3,4,4,1,1,3,3}×π / 3； {4,4,5,5,2,2,4,4}×π / 3； {0,0,1,1,4,4,0,0}×π / 3； {2,2,3,3,0,0,2,2}×π / 3； {5,5,0,0,3,3,5,5}×π / 3； {1,1,2,2,5,5,1,1}×π / 3； {4,4,3,3,0,0,4,4}×π / 3； {0,0,5,5,2,2,0,0}×π / 3； {1,1,0,0,3,3,1,1}×π / 3； {2,2,1,1,4,4,2,2}×π / 3； {3,3,2,2,5,5,3,3}×π / 3； {5,5,4,4,1,1,5,5}×π / 3； {4.5,3,5,5.5,0.5,5.5,0,0}×π / 3； {1.5,3,1,0.5,5.5,0.5,0,0}×π / 3； {5.5,0,0.5,0.5,3.5,3.5,5.5,5.5}×π / 3； {2.5,3,3.5,3.5,0.5,0.5,2.5,2.5}×π / 3； {3.5,4,4.5,4.5,1.5,1.5,3.5,3.5}×π / 3； {4.5,5,5.5,5.5,2.5,2.5,4.5,4.5}×π / 3； {0.5,0,5.5,5.5,2.5,2.5,0.5,0.5}×π / 3； {0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3； {1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3； {1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3； {4.5,4,3.5,3.5,0.5,0.5,4.5,4.5}×π / 3； {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3； {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3； {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3。 7. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,0,0,3,0,0}×π / 3； {0,3,3,3,3,3,0,0}×π / 3； {3,0,0,0,0,0,3,3}×π / 3； {0,2,3,0,0,3,0,0}×π / 3； {5,0,1,1,1,1,3,2}×π / 3； {0,1,2,2,2,2,4,3}×π / 3； {2,3,4,4,4,4,0,5}×π / 3； {1,2,3,3,3,3,5,4}×π / 3； {3,4,5,5,5,5,1,0}×π / 3； {4,5,0,0,0,0,2,1}×π / 3； {0,5,4,4,4,4,2,3}×π / 3； {1,0,5,5,5,5,3,4}×π / 3； {3,2,1,1,1,1,5,0}×π / 3； {4,3,2,2,2,2,0,1}×π / 3； {2,1,0,0,0,0,4,5}×π / 3； {5,4,3,3,3,0,1,2}×π / 3； {5.5,1.5,1,3,0.5,1.5,3.5,3}×π / 3； {0.5,4.5,5,3,5.5,4.5,2.5,3}×π / 3； {1,0.5,1,0.5,0,1.5,3.5,0}×π / 3； {2,1.5,2,1.5,1,2.5,4.5,1}×π / 3； {0,5.5,0,5.5,5,0.5,2.5,5}×π / 3； {3,2.5,3,2.5,2,3.5,3.5,2}×π / 3； {4,3.5,4,3.5,3,4.5,0.5,3}×π / 3； {5,4.5,5,4.5,4,5.5,1.5,4}×π / 3； {5,5.5,5,5.5,0,4.5,2.5,0}×π / 3； {0,0.5,0,0.5,1,5.5,3.5,1}×π / 3； {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3； {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3； {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3； {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3。 8. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-58, -57, ..., 0, ..., 57, 58}, and the position index set of the pilot subcarrier is {-35, -25, -11, 11, 25, 35}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,3,3,0}×π / 3； {0,3,0,3,0,3}×π / 3； {3,0,3,0,3,0}×π / 3； {4,2,0,3,2,0}×π / 3； {2,4,0,3,4,3}×π / 3； {1,4,1,4,0,3}×π / 3； {2,5,2,5,1,4}×π / 3； {3,0,3,0,2,5}×π / 3； {5,2,5,2,4,1}×π / 3； {0,3,0,3,5,2}×π / 3； {4,1,4,1,3,0}×π / 3； {1,4,1,4,2,5}×π / 3； {0,3,0,3,1,4}×π / 3； {5,2,5,2,0,3}×π / 3； {2,5,2,5,3,0}×π / 3； {4,1,4,1,5,2}×π / 3； {3,0,3,0,4,1}×π / 3； {2.5,4.5,0.5,3,4,0}×π / 3； {3.5,1.5,5.5,3,2,0}×π / 3； {1.5,4.5,3,0,0.5,3}×π / 3； {4.5,1.5,0,3,3.5,0}×π / 3； {1.5,4.5,3,0,0.5,3}×π / 3； {4.5,1.5,0,3,3.5,0}×π / 3； {4.5,1.5,3,0,5.5,3}×π / 3。 9. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the pilot position index set corresponding to the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3； {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3； {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3； {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3； {3,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3； {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3； {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3； {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3； {3,5.5,5.5,0,2.5,3.5,3.5,5.5,0,2.5,3,0,3,5.5,2.5,3.5}×π / 3； {3,0.5,0.5,0,3.5,2.5,2.5,0.5,0,3.5,3,0,3,0.5,3.5,2.5}×π / 3； {2.5,4,4,4.5,1.5,2,0,0.5,3.5,4,1.5,0.5,0.5,0,2,2}×π / 3； {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3； {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3； {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3。 10. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the position index set of the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3； {0,0,0,0,3,3,3,3,0,0,0,0,0,0,3,3}×π / 3； {3,3,3,3,0,0,0,0,3,3,3,3,3,3,0,0}×π / 3； {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3； {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3； {5,0,0,1,3,3,4,3,0,1,5,5,5,5,3,3}×π / 3； {1,0,0,5,3,3,2,3,0,5,1,1,1,1,3,3}×π / 3； {2,3,3,4,0,0,1,0,3,4,2,2,2,2,0,0}×π / 3； {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3； {3.5,3,1.5,1.5,3.5,5,2.5,0.5,0,1,5.5,3,3.5,5.5,5.5,0}×π / 3； {2.5,3,4.5,4.5,2.5,1,3.5,5.5,0,5,0.5,3,2.5,0.5,0.5,0}×π / 3； {3.5,3.5,2.5,1.5,0.5,5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3； {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3； {0.5,0.5,5.5,4.5,3.5,2.5,1.5,2.5,5.5,5,0.5,0.5,1.5,1,3,3}×π / 3； {2.5,2.5,3.5,4.5,5.5,0.5,1.5,0.5,3.5,4,2.5,2.5,1.5,2,0,0}×π / 3。 11. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-103, -75, -39, -11, 11, 39, 75, 103}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,3,3,3}×π / 3； {3,3,0,0,3,0,0,3}×π / 3； {0,0,3,3,0,3,3,0}×π / 3； {3,3,0,3,0,0,3,0}×π / 3； {3,0,3,0,3,3,0,3}×π / 3； {0,3,3,0,3,0,0,3}×π / 3； {3,0,0,3,0,3,3,0}×π / 3； {3,0,0,3,3,3,0,0}×π / 3； {0,3,3,0,0,0,3,3}×π / 3； {3,3,0,0,0,3,3,0}×π / 3； {3,3,0,0,3,3,0,0}×π / 3； {0,0,3,3,0,0,3,3}×π / 3； {0,0,3,3,3,0,0,3}×π / 3； {3,3,3,0,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,3}×π / 3； {3,3,3,0,3,3,3,0}×π / 3； {0,0,3,3,3,3,0,0}×π / 3； {0,0,0,3,0,0,0,3}×π / 3； {0,3,3,0,0,3,3,0}×π / 3； {0,0,0,3,3,2,3,4}×π / 3； {0,1,0,4,3,4,3,2}×π / 3； {3,3,0,0,3,0,0,3}×π / 3； {0,0,3,3,0,3,3,0}×π / 3； {3,3,0,3,0,0,3,0}×π / 3； {3,0,3,0,3,3,0,3}×π / 3； {0,3,3,0,3,0,0,3}×π / 3； {3,0,0,3,0,3,3,0}×π / 3； {3,0,0,3,3,3,0,0}×π / 3； {0,3,3,0,0,0,3,3}×π / 3； {3,3,0,0,0,3,3,0}×π / 3； {3,3,0,0,3,3,0,0}×π / 3； {0,0,3,3,0,0,3,3}×π / 3； {0,0,3,3,3,0,0,3}×π / 3； {3,3,3,0,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,3}×π / 3； {3,3,3,0,3,3,3,0}×π / 3； {0,0,3,3,3,3,0,0}×π / 3； {0,0,0,3,0,0,0,3}×π / 3； {0,3,3,0,0,3,3,0}×π / 3； {0,4.5,0,0.5,3,3,3,3}×π / 3； {0,1.5,0,3,3,3,3,3}×π / 3； {3,3,0,0,3,0,0,3}×π / 3； {0,0,3,3,0,3,3,0}×π / 3； {3,3,0,3,0,0,3,0}×π / 3； {3,0,3,0,3,3,0,3}×π / 3； {0,3,3,0,3,0,0,3}×π / 3； {3,0,0,3,0,3,3,0}×π / 3； {3,0,0,3,3,3,0,0}×π / 3； {0,3,3,0,0,0,3,3}×π / 3； {3,3,0,0,0,3,3,0}×π / 3； {3,3,0,0,3,3,0,0}×π / 3； {0,0,3,3,0,0,3,3}×π / 3； {0,0,3,3,3,0,0,3}×π / 3； {3,3,3,0,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,3}×π / 3； {3,3,3,0,3,3,3,0}×π / 3； {0,0,3,3,3,3,0,0}×π / 3； {0,0,0,3,0,0,0,3}×π / 3； {0,3,3,0,0,3,3,0}×π / 3。 12. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, ..., 0, ..., 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3； {3,0,3,0,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3； {0,3,0,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3； {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3； {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3； {2,1,3,1,1,1,0,1,1,1,1,0,3,3,2,0}×π / 3； {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3； {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3； {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3； {0.5,0.5,2,0.5,2.5,0.5,3,2.5,1.5,0.5,0,3,3.5,0.5,3,0}×π / 3； {5.5,5.5,4,5.5,3.5,5.5,3,3.5,4.5,5.5,0,3,2.5,5.5,3,0}×π / 3； {2,1,2.5,0.5,1.5,1.5,0,0.5,0.5,1,1,0,3,2.5,0.5,0}×π / 3； {4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3； {5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3； {1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3。 13. The method according to any one of claims 2 to 4, characterized in that When the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, ..., 0, ..., 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3； {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3； {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3； {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3； {3,5,0,4,3,5,0,0,3,5,0,4,3,5,0,0}×π / 3； {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3； {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3； {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3； {3,0,3.5,5.5,0.5,0.5,2.5,3,0,0,3.5,3.5,0.5,0.5,2.5,3}×π / 3； {3,0,2.5,0.5,5.5,5.5,3.5,3,0,0,2.5,2.5,5.5,5.5,3.5,3}×π / 3； {3,4.5,5.5,4,2.5,4.5,0,0,3,4.5,0,4,3,4.5,5.5,0}×π / 3； {3.5,5.5,5.5,4.5,3,5,0,0,3.5,5.5,0,4.5,3.5,5,5.5,0}×π / 3； {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2,3,1.5,0.5,0}×π / 3； {2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3； {0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3； {0.5,2.5,2.5,1.5,0,2,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3； {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3； {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3。 14. A communication method, characterized in that: Applied to the receiving end, including: Receive a physical layer protocol data unit PPDU, where the PPDU includes a first field, where the first field carries a first sequence, where the first sequence includes a sequence on a pilot subcarrier, where the sequence on the pilot subcarrier is obtained based on a rotation factor, and where the rotation factor has more than one value; Phase tracking is performed according to the sequence on the pilot subcarrier.

15. The method according to claim 14, characterized in that The sequence on the pilot subcarrier is obtained based on the rotation factor, including: the sequence on the pilot subcarrier is generated according to the spatial mapping matrix, the spatial mapping matrix It is expressed as: And the first sequence uses a single-stream pilot; in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTF N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols of the first sequence, α k is a real number.

16. The method according to claim 14, characterized in that The first sequence is generated according to a spatial mapping matrix, wherein the spatial mapping matrix It is expressed as: in, represents the rotation factor, θ k represents the pilot phase rotation angle corresponding to pilot subcarrier k, θ k The value of K is a discrete value or a continuous value between 0 and 2π. Pilot represents the position index set of the pilot subcarriers, R LTE N LTF ×N LTF The complex matrix, N LTF represents the number of OFDM symbols of the first sequence, α k is a real number, P LTF Represents a spatial mapping matrix corresponding to a sequence on a non-pilot subcarrier in the first sequence.

17. The method according to claim 15 or 16, characterized in that θ k The value of is any of the following: {0,3}×π / 3; or, θ k The value of is any of the following: {0,1,2,3,4,5}×π / 3; or, θ k The value of is any of the following: {0,0.5,1,1.5,2,2.5,3,3.5,4,4.5,5,5.5}×π / 3.

18. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-28, -27, ..., 0, ..., 27, 28}, and the position index set of the pilot subcarrier is {-21, -7, 7, 21}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,0}×π / 3； {0,0,0,3}×π / 3； {3,3,3,0}×π / 3； {0,0,0,0}×π / 3； {0,0,0,3}×π / 3； {3,3,3,0}×π / 3； {1,1,1,4}×π / 3； {4,4,4,1}×π / 3； {5,5,5,2}×π / 3； {2,2,2,5}×π / 3； {0,0,0,0}×π / 3； {0,0,0,3}×π / 3； {3,3,3,0}×π / 3； {1,1,1,4}×π / 3； {4,4,4,1}×π / 3； {5,5,5,2}×π / 3； {2,2,2,5}×π / 3。 19. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following {0,0,0,0,3,0,0,0}×π / 3； {0,0,0,0,3,3,0,0}×π / 3； {0,0,0,0,0,0,3,3}×π / 3； {0,0,0,0,3,0,0,0}×π / 3； {3,3,4,4,1,1,3,3}×π / 3； {4,4,5,5,2,2,4,4}×π / 3； {0,0,1,1,4,4,0,0}×π / 3； {2,2,3,3,0,0,2,2}×π / 3； {5,5,0,0,3,3,5,5}×π / 3； {1,1,2,2,5,5,1,1}×π / 3； {4,4,3,3,0,0,4,4}×π / 3； {0,0,5,5,2,2,0,0}×π / 3； {1,1,0,0,3,3,1,1}×π / 3； {2,2,1,1,4,4,2,2}×π / 3； {3,3,2,2,5,5,3,3}×π / 3； {5,5,4,4,1,1,5,5}×π / 3； {4.5,3,5,5.5,0.5,5.5,0,0}×π / 3； {1.5,3,1,0.5,5.5,0.5,0,0}×π / 3； {5.5,0,0.5,0.5,3.5,3.5,5.5,5.5}×π / 3； {2.5,3,3.5,3.5,0.5,0.5,2.5,2.5}×π / 3； {3.5,4,4.5,4.5,1.5,1.5,3.5,3.5}×π / 3； {4.5,5,5.5,5.5,2.5,2.5,4.5,4.5}×π / 3； {0.5,0,5.5,5.5,2.5,2.5,0.5,0.5}×π / 3； {0.5,1,1.5,1.5,4.5,4.5,0.5,0.5}×π / 3； {1.5,1,0.5,0.5,3.5,3.5,1.5,1.5}×π / 3； {1.5,2,2.5,2.5,5.5,5.5,1.5,1.5}×π / 3； {4.5,4,3.5,3.5,0.5,0.5,4.5,4.5}×π / 3； {5.5,5,4.5,4.5,1.5,1.5,1.5,1.5}×π / 3； {3.5,3,2.5,2.5,5.5,5.5,3.5,3.5}×π / 3； {2.5,2,1.5,1.5,4.5,4.5,2.5,2.5}×π / 3。 20. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the first bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-116, -90, -48, -22, 22, 48, 90, 116}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,3,3,0,0,3,0,0}×π / 3； {0,3,3,3,3,3,0,0}×π / 3； {3,0,0,0,0,0,3,3}×π / 3； {0,2,3,0,0,3,0,0}×π / 3； {5,0,1,1,1,1,3,2}×π / 3； {0,1,2,2,2,2,4,3}×π / 3； {2,3,4,4,4,4,0,5}×π / 3； {1,2,3,3,3,3,5,4}×π / 3； {3,4,5,5,5,5,1,0}×π / 3； {4,5,0,0,0,0,2,1}×π / 3； {0,5,4,4,4,4,2,3}×π / 3； {1,0,5,5,5,5,3,4}×π / 3； {3,2,1,1,1,1,5,0}×π / 3； {4,3,2,2,2,2,0,1}×π / 3； {2,1,0,0,0,0,4,5}×π / 3； {5,4,3,3,3,0,1,2}×π / 3； {5.5,1.5,1,3,0.5,1.5,3.5,3}×π / 3； {0.5,4.5,5,3,5.5,4.5,2.5,3}×π / 3； {1,0.5,1,0.5,0,1.5,3.5,0}×π / 3； {2,1.5,2,1.5,1,2.5,4.5,1}×π / 3； {0,5.5,0,5.5,5,0.5,2.5,5}×π / 3； {3,2.5,3,2.5,2,3.5,3.5,2}×π / 3； {4,3.5,4,3.5,3,4.5,0.5,3}×π / 3； {5,4.5,5,4.5,4,5.5,1.5,4}×π / 3； {5,5.5,5,5.5,0,4.5,2.5,0}×π / 3； {0,0.5,0,0.5,1,5.5,3.5,1}×π / 3； {1,1.5,1,1.5,2,0.5,4.5,2}×π / 3； {2,2.5,2,2.5,3,1.5,5.5,3}×π / 3； {3,3.5,3,3.5,4,2.5,0.5,4}×π / 3； {4,4.5,4,4.5,5,3.5,1.5,5}×π / 3。 21. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-58, -57, ..., 0, ..., 57, 58}, and the position index set of the pilot subcarrier is {-35, -25, -11, 11, 25, 35}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,3,3,0}×π / 3； {0,3,0,3,0,3}×π / 3； {3,0,3,0,3,0}×π / 3； {4,2,0,3,2,0}×π / 3； {2,4,0,3,4,3}×π / 3； {1,4,1,4,0,3}×π / 3； {2,5,2,5,1,4}×π / 3； {3,0,3,0,2,5}×π / 3； {5,2,5,2,4,1}×π / 3； {0,3,0,3,5,2}×π / 3； {4,1,4,1,3,0}×π / 3； {1,4,1,4,2,5}×π / 3； {0,3,0,3,1,4}×π / 3； {5,2,5,2,0,3}×π / 3； {2,5,2,5,3,0}×π / 3； {4,1,4,1,5,2}×π / 3； {3,0,3,0,4,1}×π / 3； {2.5,4.5,0.5,3,4,0}×π / 3； {3.5,1.5,5.5,3,2,0}×π / 3； {1.5,4.5,3,0,0.5,3}×π / 3； {4.5,1.5,0,3,3.5,0}×π / 3； {1.5,4.5,3,0,0.5,3}×π / 3； {4.5,1.5,0,3,3.5,0}×π / 3； {4.5,1.5,3,0,5.5,3}×π / 3。 22. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the pilot position index set corresponding to the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3； {3,3,3,0,3,3,0,0,3,3,3,0,3,3,3,3}×π / 3； {0,0,0,3,0,0,3,3,0,0,0,3,3,3,0,0}×π / 3； {3,0,0,0,3,3,3,0,0,3,3,0,3,0,3,3}×π / 3； {3,4,4,5,2,2,0,1,3,4,2,1,0,0,2,2}×π / 3； {3,2,2,1,4,4,0,5,3,2,4,5,0,0,4,4}×π / 3； {0,5,5,4,1,1,3,2,0,5,1,2,3,3,1,1}×π / 3； {0,1,1,2,5,5,3,4,0,1,5,4,3,3,5,5}×π / 3； {3,5.5,5.5,0,2.5,3.5,3.5,5.5,0,2.5,3,0,3,5.5,2.5,3.5}×π / 3； {3,0.5,0.5,0,3.5,2.5,2.5,0.5,0,3.5,3,0,3,0.5,3.5,2.5}×π / 3； {2.5,4,4,4.5,1.5,2,0,0.5,3.5,4,1.5,0.5,0.5,0,2,2}×π / 3； {3.5,2,2,1.5,4.5,4,0,5.5,2.5,2,4.5,5.5,5.5,0,4,4}×π / 3； {0.5,5,5,4.5,1.5,1,3,2.5,5.5,5,1.5,2.5,2.5,3,1,1}×π / 3； {5.5,1,1,1.5,4.5,5,3,3.5,0.5,1,4.5,3.5,3.5,3,5,5}×π / 3。 23. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the second bandwidth, the position index set of the first sequence is {-244, -243, ..., 0, ..., 243, 244}, and the position index set of the pilot subcarrier is {-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,3,0,0,3,0,3,0,0,0,0,3,3,0,0,0}×π / 3； {0,0,0,0,3,3,3,3,0,0,0,0,0,0,3,3}×π / 3； {3,3,3,3,0,0,0,0,3,3,3,3,3,3,0,0}×π / 3； {3,3,5,5,3,1,3,0,0,5,0,3,3,0,0,0}×π / 3； {3,3,1,1,3,5,3,0,0,1,0,3,3,0,0,0}×π / 3； {5,0,0,1,3,3,4,3,0,1,5,5,5,5,3,3}×π / 3； {1,0,0,5,3,3,2,3,0,5,1,1,1,1,3,3}×π / 3； {2,3,3,4,0,0,1,0,3,4,2,2,2,2,0,0}×π / 3； {4,3,3,2,0,0,5,0,3,2,4,4,4,4,0,0}×π / 3； {3.5,3,1.5,1.5,3.5,5,2.5,0.5,0,1,5.5,3,3.5,5.5,5.5,0}×π / 3； {2.5,3,4.5,4.5,2.5,1,3.5,5.5,0,5,0.5,3,2.5,0.5,0.5,0}×π / 3； {3.5,3.5,2.5,1.5,0.5,5.5,4.5,5.5,2.5,2,3.5,3.5,4.5,4,0,0}×π / 3； {5.5,5.5,0.5,1.5,2.5,3.5,4.5,3.5,0.5,1,5.5,5.5,4.5,5,3,3}×π / 3； {0.5,0.5,5.5,4.5,3.5,2.5,1.5,2.5,5.5,5,0.5,0.5,1.5,1,3,3}×π / 3； {2.5,2.5,3.5,4.5,5.5,0.5,1.5,0.5,3.5,4,2.5,2.5,1.5,2,0,0}×π / 3。 24. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-122, -121, ..., 0, ..., 121, 122}, and the position index set of the pilot subcarrier is {-103, -75, -39, -11, 11, 39, 75, 103}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,0,3,3,3,3,3}×π / 3； {3,3,0,0,3,0,0,3}×π / 3； {0,0,3,3,0,3,3,0}×π / 3； {3,3,0,3,0,0,3,0}×π / 3； {3,0,3,0,3,3,0,3}×π / 3； {0,3,3,0,3,0,0,3}×π / 3； {3,0,0,3,0,3,3,0}×π / 3； {3,0,0,3,3,3,0,0}×π / 3； {0,3,3,0,0,0,3,3}×π / 3； {3,3,0,0,0,3,3,0}×π / 3； {3,3,0,0,3,3,0,0}×π / 3； {0,0,3,3,0,0,3,3}×π / 3； {0,0,3,3,3,0,0,3}×π / 3； {3,3,3,0,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,3}×π / 3； {3,3,3,0,3,3,3,0}×π / 3； {0,0,3,3,3,3,0,0}×π / 3； {0,0,0,3,0,0,0,3}×π / 3； {0,3,3,0,0,3,3,0}×π / 3； {0,0,0,3,3,2,3,4}×π / 3； {0,1,0,4,3,4,3,2}×π / 3； {3,3,0,0,3,0,0,3}×π / 3； {0,0,3,3,0,3,3,0}×π / 3； {3,3,0,3,0,0,3,0}×π / 3； {3,0,3,0,3,3,0,3}×π / 3； {0,3,3,0,3,0,0,3}×π / 3； {3,0,0,3,0,3,3,0}×π / 3； {3,0,0,3,3,3,0,0}×π / 3； {0,3,3,0,0,0,3,3}×π / 3； {3,3,0,0,0,3,3,0}×π / 3； {3,3,0,0,3,3,0,0}×π / 3； {0,0,3,3,0,0,3,3}×π / 3； {0,0,3,3,3,0,0,3}×π / 3； {3,3,3,0,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,3}×π / 3； {3,3,3,0,3,3,3,0}×π / 3； {0,0,3,3,3,3,0,0}×π / 3； {0,0,0,3,0,0,0,3}×π / 3； {0,3,3,0,0,3,3,0}×π / 3； {0,4.5,0,0.5,3,3,3,3}×π / 3； {0,1.5,0,3,3,3,3,3}×π / 3； {3,3,0,0,3,0,0,3}×π / 3； {0,0,3,3,0,3,3,0}×π / 3； {3,3,0,3,0,0,3,0}×π / 3； {3,0,3,0,3,3,0,3}×π / 3； {0,3,3,0,3,0,0,3}×π / 3； {3,0,0,3,0,3,3,0}×π / 3； {3,0,0,3,3,3,0,0}×π / 3； {0,3,3,0,0,0,3,3}×π / 3； {3,3,0,0,0,3,3,0}×π / 3； {3,3,0,0,3,3,0,0}×π / 3； {0,0,3,3,0,0,3,3}×π / 3； {0,0,3,3,3,0,0,3}×π / 3； {3,3,3,0,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,3}×π / 3； {3,3,3,0,3,3,3,0}×π / 3； {0,0,3,3,3,3,0,0}×π / 3； {0,0,0,3,0,0,0,3}×π / 3； {0,3,3,0,0,3,3,0}×π / 3。 25. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, ..., 0, ..., 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {0,0,3,0,3,0,3,3,3,0,0,3,3,0,3,0}×π / 3； {3,0,3,0,0,0,0,0,0,0,0,0,3,3,3,0}×π / 3； {0,3,0,3,3,3,3,3,3,3,3,3,0,0,0,3}×π / 3； {1,1,2,1,2,1,3,3,2,0,0,3,4,0,3,0}×π / 3； {5,5,4,5,4,5,3,3,4,0,0,3,2,0,3,0}×π / 3； {2,1,3,1,1,1,0,1,1,1,1,0,3,3,2,0}×π / 3； {4,5,3,5,5,5,0,5,5,5,5,0,3,3,4,0}×π / 3； {5,4,0,4,4,4,3,4,4,4,4,3,0,0,5,3}×π / 3； {1,2,0,2,2,2,3,2,2,2,2,3,0,0,1,3}×π / 3； {0.5,0.5,2,0.5,2.5,0.5,3,2.5,1.5,0.5,0,3,3.5,0.5,3,0}×π / 3； {5.5,5.5,4,5.5,3.5,5.5,3,3.5,4.5,5.5,0,3,2.5,5.5,3,0}×π / 3； {2,1,2.5,0.5,1.5,1.5,0,0.5,0.5,1,1,0,3,2.5,0.5,0}×π / 3； {4,5,3.5,5.5,4.5,4.5,0,5.5,5.5,5,5,0,3,3.5,5.5,0}×π / 3； {5,4,5.5,3.5,4.5,4.5,3,3.5,3.5,4,4,3,0,5.5,3.5,3}×π / 3； {1,2,0.5,2.5,1.5,1.5,3,5.5,2.5,2,2,3,0,0.5,0.5,3}×π / 3。 26. The method according to any one of claims 15 to 17, characterized in that When the bandwidth of the PPDU is the third bandwidth, the position index set of the first sequence is {-500, -499, ..., 0, ..., 499, 500}, and the position index set of the pilot subcarrier is {-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468}, wherein the pilot phase rotation angle corresponding to the pilot subcarrier is any one of the following: {3,0,3,0,0,0,3,3,0,0,3,3,0,0,3,3}×π / 3； {3,0,0,3,3,0,0,0,3,0,0,3,3,0,0,0}×π / 3； {0,3,3,0,0,3,3,3,0,3,3,0,0,3,3,3}×π / 3； {3,0,3,0,0,1,3,3,0,0,3,3,0,1,3,3}×π / 3； {3,0,3,0,0,5,3,3,0,0,3,3,0,5,3,3}×π / 3； {3,5,0,4,3,5,0,0,3,5,0,4,3,5,0,0}×π / 3； {3,1,0,2,3,1,0,0,3,1,0,2,3,1,0,0}×π / 3； {0,2,3,1,0,2,3,3,0,2,3,1,0,2,3,3}×π / 3； {0,4,3,5,0,4,3,3,0,4,3,5,0,4,3,3}×π / 3； {3,0,3.5,5.5,0.5,0.5,2.5,3,0,0,3.5,3.5,0.5,0.5,2.5,3}×π / 3； {3,0,2.5,0.5,5.5,5.5,3.5,3,0,0,2.5,2.5,5.5,5.5,3.5,3}×π / 3； {3,4.5,5.5,4,2.5,4.5,0,0,3,4.5,0,4,3,4.5,5.5,0}×π / 3； {3.5,5.5,5.5,4.5,3,5,0,0,3.5,5.5,0,4.5,3.5,5,5.5,0}×π / 3； {3,1.5,0.5,2,3.5,1.5,0,0,3,1.5,0,2,3,1.5,0.5,0}×π / 3； {2.5,0.5,0.5,1.5,3,1,0,0,2.5,0.5,0,1.5,2.5,1,0.5,0}×π / 3； {0,1.5,2.5,1,5.5,1.5,3,3,0,1.5,3,1,0,1.5,2.5,3}×π / 3； {0.5,2.5,2.5,1.5,0,2,3,3,0.5,2.5,3,1.5,0.5,2,2.5,3}×π / 3； {0,4.5,3.5,5,0.5,4.5,3,3,0,4.5,3,5,0,4.5,3.5,3}×π / 3； {5.5,3.5,3.5,4.5,0,4,3,3,5.5,3.5,3,4.5,5.5,4,3.5,3}×π / 3。 27. A communication device, characterized in that: The method comprises units or modules for executing the method as claimed in any one of claims 1 to 13.

28. A communication device, characterized in that: The method comprises means or modules for performing the method as claimed in any one of claims 14 to 26.

29. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or instruction. When the computer program or instruction is executed on a communication device, the communication device is caused to execute the method according to any one of claims 1 to 13.

30. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program or instruction, and when the computer program or instruction is executed on the communication device, the communication device is caused to perform the method according to any one of claims 14 to 26.

31. A computer program product, characterized in that The computer program product comprises a computer program or instructions for performing the method according to any one of claims 1 to 13.

32. A computer program product, characterized in that The computer program product comprises a computer program or instructions for performing the method of any one of claims 14 to 26.

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