Communication method and device

Abstract

A communication method and apparatus that support an IEEE 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 protocol, or an IEEE 802.11 bf / sensing / sensing protocol. The method comprises: generating and sending a PPDU, the PPDU comprising a first field, the first field being used for bearing a part or all of a first sequence, the part or all of the first sequence being used for a receiving end to perform channel estimation, the first sequence comprising a first base sequence and a second base sequence, and the second base sequence and the first base sequence satisfying a relationship of alternate negation and inverse sequence. According to the invention, the first sequence is designed to support signal transmission of multiple spatial streams, so that the accuracy of channel estimation is improved.

Description

Technical Field

[0001] This application relates to the field of communication technologies, and more particularly, to a communication method and apparatus. Background Art

[0002] With the ultra-high growth of wireless traffic, users' demand for the quality of communication services is also getting higher and higher, such as low latency, ultra-reliability, etc. As a key technology for carrying wireless traffic services, the wireless local area network (WLAN) has been continuously developed and evolved to meet the increasingly high requirements for wireless transmission.

[0003] Millimeter Wave (mmWave) has become an important direction for future WLANs 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 signals to achieve high-frequency millimeter wave transmission, and thus has received extensive attention. With the development of multiple input multiple output (MIMO) technology, the WLAN standard supports the simultaneous transmission of multiple spatial streams. However, for IMMW, there is a large correlation between the data transmitted by multiple spatial streams, which may affect the transmission performance. Summary of the Invention

[0004] This application provides a communication method and apparatus, which designs a first sequence to support the transmission of multiple spatial streams and ensure the transmission performance.

[0005] In a first aspect, a communication method is provided. This method can be executed by a sending end, or by a component (such as a chip, circuit, or module, etc.) configured in the sending end. This application does not make any limitations.

[0006] The method includes: generating a physical protocol data unit (PPDU), where the PPDU includes a first field, and the first field is used to carry a part or all of a first sequence. A part or all of the first sequence is used for a receiving end to perform channel estimation. The first sequence includes a first basic sequence and a second basic sequence, and the second basic sequence and the first basic sequence satisfy the relationship of alternating inversion and reverse order; and sending the PPDU.

[0007] Exemplarily, the transmitting end may be an access point (AP), or may also be a non-access point (non-AP) station (STA). The receiving end may be an AP or an STA, and this application does not make any limitation thereto. For example, one communication scenario may be: the transmitting end is an AP and the receiving end is an STA; one communication scenario may be: the transmitting end is an STA and the receiving end is an AP; one communication scenario may be: the transmitting end is an STA and the receiving end is an STA; one communication scenario may be: the transmitting end is an AP and the receiving end is an AP.

[0008] Exemplarily, the first sequence may be an LTF (long training field) sequence. In a high-frequency band, for example, in a millimeter-wave system, the first sequence may also be referred to as a CEF (channel estimation field) sequence, and this application does not make any limitation thereto.

[0009] Exemplarily, the PPDU may be used for high-frequency millimeter-wave communication, or rather, the subcarrier spacing for transmitting the PPDU in this application is greater than or equal to 312.5 KHz.

[0010] According to the above solution, by designing the first sequence to support multi-spatial-stream transmission, the first sequence not only has a low PAPR over the entire bandwidth, but also has a low PAPR in multi-spatial-stream transmission scenarios. The first sequences corresponding to different multi-spatial-stream transmissions are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted in multiple spatial streams, that is, reduce the transmission interference between multiple spatial streams, thereby improving the accuracy of the channel estimation result and ensuring the system transmission performance.

[0011] Combined with the first aspect, in some implementation manners of the first aspect, the first basis sequence is located on the high-frequency side of the center frequency band (or center frequency) of the PPDU bandwidth, and the second basis sequence is located on the low-frequency side of the center frequency band (or center frequency) of the PPDU bandwidth.

[0012] It should be understood that high frequency and low frequency are relative to the center frequency. The high-frequency side refers to the frequency greater than or higher than the center frequency of the PPDU bandwidth, and the low-frequency side refers to the frequency less than or lower than the center frequency of the PPDU bandwidth. For example, assuming that the center frequency of the PPDU bandwidth is 0, high frequency represents a frequency greater than 0, and low frequency represents a frequency less than 0.

[0013] Combined with the first aspect, in some implementation manners of the first aspect, the first basis sequence s(i) and the second basis sequence s A (i) satisfy the relationship of alternating sign inversion and reverse order, including:

[0014] s A s(i) = s(j - i)(-1) j-i , where i = 0, 1, 2, …, j;

[0015] Here, i represents the index of an element in the first base sequence or the second base sequence. The first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

[0016] Combined with the first aspect, in some implementations of the first aspect, the first base sequence s(i) and the second base sequence -s A (i) satisfy the relationship of taking alternating negation and reverse order, including:

[0017] -s A (i) = -s(j - i)(-1) j-i , where i = 0, 1, 2, …, j;

[0018] Here, i represents the index of an element in the first base sequence or the second base sequence. The first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

[0019] In this application, the lengths of the first base sequence and the second base sequence are the same, or in other words, the number of elements included in the first base sequence and the second base sequence is the same.

[0020] In other words, s A (i) is the sequence obtained by reversing the elements at the positions corresponding to the even indices of the sequence s(i) after taking the negation, and reversing the elements at the positions corresponding to the odd indices of s(i); or, -s A (i) is the sequence obtained by reversing the elements at the positions corresponding to the odd indices of the sequence s(i) after taking the negation, and reversing the elements at the positions corresponding to the even indices of s(i); or, s A (i) is the sequence obtained by taking the negation of the elements at the positions corresponding to the even indices after reversing the sequence s(i), and keeping the elements at the positions corresponding to the odd indices of the reversed s(i) unchanged, and -S A (i) is the sequence obtained by taking the negation of the elements at the positions corresponding to the odd indices after reversing the sequence s(i), and keeping the elements at the positions corresponding to the even indices of the reversed s(i) unchanged.

[0021] Based on the above scheme, by designing the first base sequence and performing reverse order and alternating negation (either reverse order first and then alternating negation, or alternating negation first and then reverse order) on the first base sequence, the second base sequence can be obtained, and thus the first sequence can be determined. This first sequence not only has a lower PAPR, but also the first sequences corresponding to multiple spatial streams are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted by multiple spatial streams, reduce the transmission interference between multiple spatial streams, thereby ensuring the system transmission performance and improving the accuracy of the channel estimation result.

[0022] In combination with the first aspect, in certain implementations of the first aspect, the elements of the first base sequence and the second base sequence take values of 1 or -1.

[0023] In combination with the first aspect, in certain implementations of the first aspect, there are an odd number of 0 elements between the first base sequence and the second base sequence. For example, there can be 1 or 3 0 elements between the first base sequence and the second base sequence.

[0024] Based on the above scheme, by designing the elements of the first sequence to take values of 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0025] In the first possible implementation, the PPDU can be transmitted using the first bandwidth, and the first bandwidth can be a bandwidth in the high frequency, that is, the PPDU can be used for high-frequency millimeter-wave communication. For example, the first bandwidth can be a bandwidth obtained by multiplying the 20MHz bandwidth by a frequency multiplier (such as 4 times, or 8 times, or 16 times, etc.), and at this time, the first bandwidth can be 80MHz, or 160MHz, or 320MHz bandwidth, etc.

[0026] In combination with the first aspect, in certain implementations of the first aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-28, -27, …, -1, 0, 1, …, 27, 28}, that is, the length of the first sequence is 57. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {1, …, 27, 28}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-28, -27, …, -1}, that is, the lengths of the first base sequence and the second base sequence are both 28.

[0027] The first base sequence is {1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1}, the second base sequence is {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1}, and the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 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}; or,

[0028] The first base sequence is {1, 1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1}, the second base sequence is {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1}, and the first sequence is: {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 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}; or,

[0029] The first base sequence is: {1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1}, the second base sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1}, and the first sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 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}; or,

[0030] The first base sequence is: {1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1}, the second base sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1}, and the first sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 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}; or,

[0031] The first base sequence is: {1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1}, and the first sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 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}; or,

[0032] The first base sequence is: {1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1}, the second base sequence is: {-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1}, and the first sequence is: {-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 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}; or,

[0033] The first base sequence is: {-1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}, the second base sequence is: {-1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1}, and the first sequence is: {-1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 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}; or,

[0034] The first base sequence is: {-1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1}, the second base sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1}, and the first sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 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}.

[0035] Based on the above scheme, the first sequence provided by this implementation method not only has a low PAPR under the first bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios, so as to improve the accuracy of channel estimation. Among them, any two different first sequences are orthogonal, and can avoid the influence brought by unnecessary beamforming when supporting up to 8 spatial stream transmissions, that is, the signal transmissions between multiple spatial streams do not interfere with each other, so that the system transmission performance can be guaranteed. In addition, since the element values of the first sequence provided above are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0036] In a second possible implementation, the PPDU may be transmitted using a second bandwidth, which may be a bandwidth in the high frequency band, that is, the PPDU may be used for high-frequency millimeter-wave communication. For example, the second bandwidth may be a bandwidth obtained by multiplying a 40 MHz bandwidth by a certain factor (such as 4 times, or 8 times, or 16 times, etc.). In this case, the second bandwidth may be 160 MHz, or 320 MHz, or 640 MHz bandwidth, etc.

[0037] Combined with the first aspect, in some implementations of the first aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, that is, the length of the first sequence is 117. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 57, 58}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-58, -57, …, -2}, that is, the lengths of the first base sequence and the second base sequence are both 57.

[0038] The first base sequence is: {1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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}, and the first sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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, 1, 1, 1, -1}; or,

[0039] The first base sequence is: {1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -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}; or,

[0040] The first base sequence is: {1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -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}; or,

[0041] The first base sequence is: {-1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1}, the first sequence is: {-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 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, -1, 1, -1, 1}; or,

[0042] The first base sequence is: {1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1}, the first sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -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, 1, 1, 1, -1}; or,

[0043] The first base sequence is: {1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -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}; or,

[0044] The first base sequence is: {1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -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}; or,

[0045] The first base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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}, and the first sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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, -1, 1, -1, 1}.

[0046] Based on the above scheme, the first sequence provided by this implementation method not only has a lower PAPR under the second bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios to improve the accuracy of channel estimation. Among them, any two different first sequences are orthogonal, and can avoid the influence brought by unnecessary beamforming when supporting up to 8 spatial stream transmissions. That is to say, the signal transmissions between multiple spatial streams do not interfere with each other, so as to ensure the system transmission performance. In addition, since the element values of the first sequence provided above are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0047] In a third possible implementation, the PPDU can be transmitted using a third bandwidth, which can be a bandwidth in the high frequency range, i.e., the PPDU can be used for high-frequency millimeter-wave communication. For example, the third bandwidth is a bandwidth obtained by multiplying an 80 MHz bandwidth by a frequency multiplication factor (such as 2 times, or 4 times, or 8 times, etc.). In this case, the third bandwidth can be 160 MHz, or 320 MHz, or 640 MHz bandwidth, etc.

[0048] Combined with the first aspect, in some implementations of the first aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-122, -121, …, -1, 0, 1, …, 121, 122}, that is, the length of the first sequence is 245. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 121, 122}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-122, -121, …, -2}, that is, the lengths of the first base sequence and the second base sequence are both 121.

[0049] The first base sequence is: {1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -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, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1}, the second base sequence is: {1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -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, -1, 1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1}, the first sequence is: {1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -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, -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, -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, 1, 1, -1, 1, 1, -1, 1, 1}; or,

[0050] The first base sequence is: {1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 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, -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}; or,

[0051] The first base sequence is: {1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -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, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1}, the second base sequence is: {1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -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, 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,-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,-1,1,-1,-1,1,1,1,-1,-1,-1,1}; or,

[0052] The first base sequence is: {-1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -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, 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}, the second base sequence is: {1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -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, -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, -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, -1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1}; or,

[0053] The first base sequence is: {1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 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, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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}, the first sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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, 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, 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, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}; or,

[0054] The first base sequence is: {1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -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, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -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, -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, -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, 1, -1, -1, -1, 1, -1, -1, -1, -1}; or,

[0055] The first base sequence is: {1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 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, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 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}, the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 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, -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, -1, -1, -1, -1, 1, 1, -1}; or,

[0056] The first base sequence is: {-1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 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, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 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, 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, -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, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1}。,

[0057] Based on the above solution, the first sequence provided by this implementation method not only has a lower PAPR under the third bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios, so as to improve the accuracy of channel estimation. Among them, any two different first sequences are orthogonal to each other, and can avoid the influence brought by unnecessary beamforming when supporting up to 8 spatial stream transmissions. That is to say, the signal transmissions between multiple spatial streams do not interfere with each other, so as to ensure the system transmission performance. In addition, since the element values of the first sequence provided above are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0058] In a second aspect, a communication method is provided. This method can be executed by the receiving end or by components (such as chips, circuits, or modules, etc.) configured in the receiving end. This application does not make any limitations.

[0059] The method includes: receiving a physical layer protocol data unit PPDU, where the PPDU includes a first field, and the first field carries part or all of the first sequence that has passed through the wireless channel; performing channel estimation according to part or all of the first sequence that has passed through the wireless channel and a preset first sequence. The preset first sequence includes a first base sequence and a second base sequence, and the second base sequence and the first base sequence satisfy the relationship of alternating inversion and reverse order.

[0060] According to the above solution, by designing the first sequence to support multiple spatial stream transmissions, the first sequence not only has a lower PAPR across the entire bandwidth, but also has a lower PAPR in multiple spatial stream transmission scenarios. The first sequences corresponding to multiple spatial stream transmissions are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted in multiple spatial stream transmissions, that is, reduce the transmission interference between multiple spatial streams, thereby improving the accuracy of the channel estimation result and ensuring the system transmission performance.

[0061] In combination with the second aspect, in some implementations of the second aspect, the first base sequence is located on the high-frequency side of the center frequency band of the bandwidth of the PPDU, and the second base sequence is located on the low-frequency side of the center frequency band of the bandwidth of the PPDU.

[0062] In combination with the second aspect, in some implementations of the second aspect, the first base sequence s(i) and the second base sequence s A (i) satisfy the relationship of alternating inversion and reverse order, including:

[0063] s A (i) = s(j - i)(-1) j-i , i = 0, 1, 2,..., j;

[0064] where i represents the index of the element of the first base sequence or the second base sequence, the first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

[0065] In combination with the second aspect, in some implementations of the second aspect, the first base sequence s(i) and the second base sequence -s A (i) satisfy the relationship of alternating inversion and reverse order, including:

[0066] -s A (i) = -s(j - i)(-1) j-i , i = 0, 1, 2,..., j;

[0067] where i represents the index of the element of the first base sequence or the second base sequence, the first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

[0068] In combination with the second aspect, in some implementations of the second aspect, the elements of the first base sequence and the second base sequence take values of 1 or -1.

[0069] In combination with the second aspect, in some implementations of the second aspect, there are an odd number of 0 elements between the first base sequence and the second base sequence.

[0070] In combination with the second aspect, in some implementations of the second aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-28, -27,..., -1, 0, 1,..., 27, 28}, that is, the length of the first sequence is 57. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {1,..., 27, 28}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-28, -27,..., -1}, that is, the lengths of the first base sequence and the second base sequence are both 28.

[0071] The first base sequence is {1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1}, the second base sequence is {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1}, and the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 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}; or,

[0072] The first base sequence is {1, 1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1}, the second base sequence is {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1}, and the first sequence is: {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 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}; or,

[0073] The first base sequence is: {1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1}, the second base sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1}, and the first sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 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}; or,

[0074] The first base sequence is: {1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1}, the second base sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1}, and the first sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 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}; or,

[0075] The first base sequence is: {1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1}, and the first sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 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}; or,

[0076] The first base sequence is: {1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1}, the second base sequence is: {-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1}, and the first sequence is: {-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 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}; or,

[0077] The first base sequence is: {-1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}, the second base sequence is: {-1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1}, and the first sequence is: {-1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 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}; or,

[0078] The first base sequence is: {-1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1}, the second base sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1}, and the first sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 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}.

[0079] Combined with the second aspect, in some implementations of the second aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, that is, the length of the first sequence is 117. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 57, 58}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-58, -57, …, -2}, that is, the lengths of both the first base sequence and the second base sequence are 57.

[0080] The first base sequence is: {1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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}; or,

[0081] The first base sequence is: {1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -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}; or,

[0082] The first base sequence is: {1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -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}; or,

[0083] The first base sequence is: {-1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -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}, and the second base sequence is: {-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 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}; or,

[0084] The first base sequence is: {1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1}, the first sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -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, 1, 1, 1, -1}; or,

[0085] The first base sequence is: {1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -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}; or,

[0086] The first base sequence is: {1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -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}; or,

[0087] The first base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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}, and the first sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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, -1, 1, -1, 1}.

[0088] Combined with the second aspect, in some implementations of the second aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-122, -121, …, -1, 0, -1, …, 121, 122}, that is, the length of the first sequence is 245. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 121, 122}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-122, -121, …, -2}, that is, the lengths of the first base sequence and the second base sequence are both 121.

[0089] The first base sequence is: {1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -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, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1}, the second base sequence is: {1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -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, -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, -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, 1, 1, -1, 1, 1, -1, 1, 1}; or,

[0090] The first base sequence is: {1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 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, -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}; or,

[0091] The first base sequence is: {1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -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, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1}, the second base sequence is: {1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -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, 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,-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,-1,1,-1,-1,1,1,1,-1,-1,-1,1}; or,

[0092] The first base sequence is: {-1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -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, 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}, the second base sequence is: {1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -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, -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, -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, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1}; or,

[0093] The first base sequence is: {1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 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, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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}, the first sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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, 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, 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, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}; or,

[0094] The first base sequence is: {1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -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, -1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -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, -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, -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, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}; or,

[0095] The first base sequence is: {1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 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, -1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1}, the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 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, -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, -1, -1, -1, -1, 1, 1, -1}; or,

[0096] The first base sequence is: {-1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 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, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 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, 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, -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, 1, -1, -1, 1, -1, -1, -1, 1, -1, 1}。,

[0097] The beneficial effects of the above second aspect and certain implementations of the second aspect can be correspondingly referred to the description related to the first aspect, and will not be elaborated here.

[0098] In a third aspect, a communication method is provided. This method can be executed by a sending end or by components (such as chips, circuits, or modules, etc.) configured in the sending end. This application does not make a limitation. For example, the sending end can be an AP or a STA.

[0099] The method includes: generating a physical layer protocol data unit PPDU, where the PPDU includes a first field, and the first field is used to carry a part or all of a first sequence, and a part or all of the first sequence is used for a receiving end to perform channel estimation; sending the PPDU.

[0100] According to the above solution, by designing the first sequence to support multi-spatial stream transmission, the first sequence has a low PAPR across the entire bandwidth, and the first sequences respectively used by multiple spatial streams are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted by multiple spatial streams, that is, reduce the transmission interference between multiple spatial streams, thereby ensuring the system transmission performance and improving the accuracy of the channel estimation result.

[0101] In a first possible implementation manner, the PPDU can be transmitted using a first bandwidth, and the first bandwidth can be a bandwidth located in the high frequency, that is, the PPDU can be used for high-frequency millimeter-wave communication. For example, the first bandwidth can be a bandwidth obtained by multiplying a 20 MHz bandwidth by a certain multiple (such as 4 times, or 8 times, or 16 times, etc.). At this time, the first bandwidth can be 80 MHz, or 160 MHz, or 320 MHz bandwidth, etc.

[0102] In combination with the third aspect, in some implementation manners of the third aspect, the set of position indexes of the subcarriers corresponding to the first sequence is {-28, -27, …, -1, 0, 1, …, 27, 28}, that is, the length of the first sequence is 57, where the first sequence is any one of the following:

[0103] {-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}; or,

[0104] {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}; or,

[0105] {-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}; or,

[0106] {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}; or,

[0107] {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}; or,

[0108] {-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}; or,

[0109] {-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}; or,

[0110] {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}.

[0111] Based on the above scheme, the first sequence provided by this implementation method not only has a lower PAPR at the first bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios, so as to improve the accuracy of channel estimation. Among them, any two different first sequences are orthogonal, and can avoid the influence brought by unnecessary beamforming when supporting up to 8 spatial stream transmissions. That is to say, the signal transmissions between multiple spatial streams do not interfere with each other, so as to ensure the system transmission performance. In addition, since the element values of the first sequence provided above are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0112] In the second possible implementation method, the PPDU can be transmitted using the second bandwidth, and the second bandwidth can be a bandwidth in the high frequency, that is, the PPDU can be used for high-frequency millimeter-wave communication. For example, the second bandwidth can be a bandwidth obtained by multiplying the 40MHz bandwidth by a frequency multiplier (such as 4 times, or 8 times, or 16 times, etc.). At this time, the second bandwidth can be 160MHz, or 320MHz, or 640MHz bandwidth, etc.

[0113] Combined with the third aspect, in some implementation manners of the third aspect, the set of position indexes of the subcarriers corresponding to the first sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, that is, the length of the first sequence is 117. Among them, the first sequence is any one of the following:

[0114] {-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, 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, 1, 1, -1}; or,

[0115] {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, -1, -1}; or,

[0116] {-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, 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, -1, 1, -1, -1}; or,

[0117] {-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, 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, -1, 1, -1, 1}; or,

[0118] {-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, 1, 1, -1}; or,

[0119] {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, 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, -1, -1, -1}; or,

[0120] {-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, 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, 1, -1, -1}; or,

[0121] {-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, -1, 1, -1, 1}.

[0122] Based on the above solution, the first sequence provided by this implementation method not only has a lower PAPR under the second bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios to improve the accuracy of channel estimation. Among them, any two different first sequences are orthogonal, and can avoid the influence brought by unnecessary beamforming when supporting up to 8 spatial stream transmissions, that is, the signal transmissions between multiple spatial streams do not interfere with each other, so that the system transmission performance can be guaranteed. In addition, since the element values of the first sequence provided above are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0123] In the third possible implementation method, the PPDU can be transmitted using the third bandwidth, and the third bandwidth can be a bandwidth in the high frequency, that is, the PPDU can be used for high-frequency millimeter-wave communication. For example, the third bandwidth is the bandwidth obtained by multiplying the 80MHz bandwidth by a frequency multiple (such as 2 times, or 4 times, or 8 times, etc.). At this time, the third bandwidth can be 160MHz, or 320MHz, or 640MHz bandwidth, etc.

[0124] Combined with the third aspect, in some implementation methods of the third aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-122, -121, …, -1, 0, 1, …, 121, 122}, that is, the length of the first sequence is 245. Among them, the first sequence is any one of the following:

[0125] {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, 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, 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, -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};< / or,

[0126] {-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, -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, 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, 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}; or,

[0127] {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, 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, 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, -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}; or,

[0128] {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,-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,-1,1,1,1,1,-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,-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}; or,

[0129] {-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, -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, 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}; or,

[0130] {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, 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, -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, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}; or,

[0131] {-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, -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, 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, -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, -1, -1, -1, -1, 1, 1, -1}; or,

[0132] {-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, -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, -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, 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}.

[0133] Based on the above solution, the first sequence provided by this implementation method not only has a lower PAPR under the third bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios to improve the accuracy of channel estimation. Among them, any two different first sequences are orthogonal, and can avoid the influence of unnecessary beamforming when supporting up to 8 spatial stream transmissions, that is, the signal transmissions between multiple spatial streams do not interfere with each other, so as to ensure the system transmission performance. In addition, since the element values of the first sequence provided above are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0134] In a fourth aspect, a communication method is provided. This method can be executed by the receiving end or by components (such as chips, circuits, or modules, etc.) configured in the receiving end. This application does not make a limitation. For example, the receiving end can be an AP or an STA.

[0135] The method includes: receiving a physical layer protocol data unit (PPDU), where the PPDU includes a first field that carries part or all of a first sequence that has passed through a wireless channel; and performing channel estimation based on part or all of the first sequence that has passed through the wireless channel and a preset first sequence.

[0136] According to the above solution, by designing the first sequence to support multi-spatial stream transmission, the first sequence has a low peak-to-average power ratio (PAPR) across the entire bandwidth, and the first sequences respectively used by multiple spatial streams are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted by multiple spatial streams, that is, reduce the transmission interference between multiple spatial streams, thereby ensuring the system transmission performance and improving the accuracy of the channel estimation result.

[0137] Combined with the fourth aspect, in some implementation manners of the fourth aspect, the set of position indexes of the subcarriers corresponding to the first sequence is {-28, -27, …, -1, 0, 1, …, 27, 28}, that is, the length of the first sequence is 57. Among them, the first sequence is any one of the following:

[0138] {-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}; or,

[0139] {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}; or,

[0140] {-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}; or,

[0141] {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}; or,

[0142] {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}; or,

[0143] {-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}; or,

[0144] {-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}; or,

[0145] {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}.

[0146] Combined with the fourth aspect, in some implementation manners of the fourth aspect, the set of position indexes of the sub - carriers corresponding to the first sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, that is, the length of the first sequence is 117. Among them, the first sequence is any one of the following:

[0147] {-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, 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, 1, 1, 1, -1}; or,

[0148] {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, -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}; or,

[0149] {-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, 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, 1, -1}; or,

[0150] {-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, 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, -1, 1}; or,

[0151] {-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, 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, 1, 1, 1, -1}; or,

[0152] {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, -1, -1, -1, -1}; or,

[0153] {-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, -1, 1, -1, -1}; or,

[0154] {-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, 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, -1, 1, -1, 1}。

[0155] Combined with the fourth aspect, in some implementations of the fourth aspect, the set of position indices of the subcarriers corresponding to the first sequence is {-122, -121, …, -1, 0, 1, …, 121, 122}, that is, the length of the first sequence is 245. Among them, the first sequence is any one of the following:

[0156] {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, 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, 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, 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} ; or,

[0157] {-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, -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, 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, 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}; or,

[0158] {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, 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, 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, -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}; or,

[0159] {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, -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, 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}; or,

[0160] {-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, -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, 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}; or,

[0161] {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, 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, -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, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}; or,

[0162] {-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,-1,1,1,1,-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,-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,-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,-1,-1,-1,-1,-1,-1,-1,1,1,-1}; or,

[0163] {-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,-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,-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,-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,-1,1,-1,-1,1,-1,-1,-1,1,-1,1}。

[0164] The beneficial effects of the above-mentioned fourth aspect and certain implementations of the fourth aspect can be correspondingly referred to the description related to the third aspect, and will not be elaborated here.

[0165] In a fifth aspect, a communication device is provided. The device can be a sending end or a component (such as a chip, a circuit, or a module, etc.) in the sending end, which is not limited in this application.

[0166] The device includes: a processing unit, configured to generate a PPDU. The PPDU includes a first field, and the first field is used to carry a part or all of a first sequence. The part or all of the first sequence is used for a receiving end to perform channel estimation. The first sequence includes a first base sequence and a second base sequence, and the second base sequence and the first base sequence satisfy the relationship of alternating inversion and reverse order; a transceiver unit, configured to send the PPDU.

[0167] The transceiver unit can perform the receiving and sending processes in the foregoing first aspect, and the processing unit can perform other processes in the foregoing first aspect except for receiving and sending.

[0168] The technical effects of the device shown in the foregoing fifth aspect can be referred to the technical effects in the first aspect and its possible designs.

[0169] In a sixth aspect, a communication device is provided. The device can be a receiving end or a component in the receiving end (such as a chip, a circuit, or a module, etc.), and this application does not make a limitation.

[0170] The device includes: a transceiver unit, configured to receive a PPDU, where the PPDU includes a first field, and the first field carries a part or all of a first sequence that has passed through a wireless channel; a processing unit, configured to perform channel estimation according to a part or all of the first sequence that has passed through the wireless channel and a preset first sequence, where the preset first sequence includes a first base sequence and a second base sequence, and the second base sequence and the first base sequence satisfy a relationship of alternating inversion and reverse order.

[0171] The transceiver unit can perform the receiving and sending processes in the foregoing second aspect, and the processing unit can perform other processes in the foregoing second aspect except for receiving and sending.

[0172] The technical effects of the device shown in the foregoing sixth aspect can be referred to the technical effects in the second aspect and its possible designs.

[0173] In a seventh aspect, a communication device is provided. The device can be a sending end or a component in the sending end (such as a chip, a circuit, or a module, etc.), and this application does not make a limitation.

[0174] The device includes: a processing unit, configured to generate a PPDU, where the PPDU includes a first field, and the first field is used to carry a part or all of a first sequence, and the part or all of the first sequence is used for a receiving end to perform channel estimation; a transceiver unit, configured to send the PPDU.

[0175] The transceiver unit can perform the receiving and sending processes in the foregoing third aspect, and the processing unit can perform other processes in the foregoing third aspect except for receiving and sending.

[0176] The technical effects of the device shown in the foregoing seventh aspect can be referred to the technical effects in the third aspect and its possible designs.

[0177] In an eighth aspect, a communication device is provided. The device can be a receiving end or a component in the receiving end (such as a chip, a circuit, or a module, etc.), and this application does not make a limitation.

[0178] The apparatus includes: a transceiver unit configured to receive a PPDU, where the PPDU includes a first field that carries part or all of a first sequence that has passed through a wireless channel; and a processing unit configured to perform channel estimation based on part or all of the first sequence that has passed through the wireless channel and a preset first sequence.

[0179] The transceiver unit may perform the receiving and transmitting processes in the foregoing fourth aspect, and the processing unit may perform other processes in the foregoing fourth aspect except for receiving and transmitting.

[0180] For the technical effects of the apparatus shown in the foregoing eighth aspect, reference may be made to the technical effects in the eighth aspect and its possible designs.

[0181] In a ninth aspect, there is provided a communication apparatus including a processor configured to call and run a computer program stored in a memory and control a transceiver to transmit and receive signals, so that the communication apparatus performs any one of the first aspect to the fourth aspect, or a method in any possible implementation manner of these aspects. Optionally, the communication apparatus may further include the memory for storing the computer program, and the communication apparatus may further include the transceiver.

[0182] In a tenth aspect, there is provided a communication apparatus including a processor, where the processor is configured to process data and / or information so that any one of the first aspect to the fourth aspect, or a method in any possible implementation manner of these aspects is executed. Optionally, the communication apparatus may further include a communication interface configured to receive data and / or information and transmit the received data and / or information to the processor. Optionally, the communication interface is further configured to output the data and / or information after being processed by the processor.

[0183] In an eleventh aspect, there is provided a chip including a processor, where the processor is configured to run a program or an instruction so that the chip performs any one of the first aspect to the fourth aspect, or a method in any possible implementation manner of these aspects. Optionally, the chip may further include a memory for storing the program or the instruction. Optionally, the chip may further include the transceiver.

[0184] In a twelfth aspect, there is provided a computer-readable storage medium storing computer instructions for implementing any one of the first aspect to the fourth aspect, or a method in any possible implementation manner of these aspects.

[0185] In a thirteenth aspect, a computer program product is provided, the computer program product including computer program code for implementing the method in any one of the first aspect to the fourth aspect, or any possible implementation manner of any one of these aspects.

[0186] In a fourteenth aspect, a communication system is provided, including the communication device in any one of the foregoing fifth aspect to the eighth aspect. Description of the Drawings

[0187] Figure 1 is a schematic diagram of an application scenario applicable to the embodiments of the present application;

[0188] Figure 2 is a schematic structural diagram of a multi-stream LTF sequence provided by the embodiments of the present application;

[0189] Figure 3 is a schematic interaction flow diagram of a communication method provided by the embodiments of the present application;

[0190] Figure 4 is a schematic interaction flow diagram of another communication method provided by the embodiments of the present application;

[0191] Figure 5 is a schematic structural diagram of a communication device provided by the embodiments of the present application;

[0192] Figure 6 is a schematic structural diagram of another communication device provided by the embodiments of the present application. Detailed Embodiments

[0193] Next, the technical solutions in the present application will be described with reference to the drawings.

[0194] The technical solutions provided by the embodiments of the present application can be applied to a wireless local area network (WLAN) scenario. For example, it supports 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, 802.11ad standards, 802.11ay standards, UWB standards of the 802.15 series of standards, and 802.11bf series of standards.

[0195] Although the embodiments of the present application mainly illustrate by taking the deployment of a WLAN network, especially a network applying the IEEE 802.11 system standard as an example, those skilled in the art can easily understand that all aspects involved in the embodiments of the present application can be extended to other networks adopting various standards or protocols. For example, BLUETOOTH networks, high-performance radio local area networks (HIPERLAN), wireless wide area networks (WWAN), wireless personal area networks (WPAN), or other currently known or future-developed networks. Therefore, regardless of the coverage range and wireless access protocol used, all aspects provided by the embodiments of the present application can be applied to any suitable wireless network.

[0196] The technical solutions of the embodiments of the present application can also be applied to various communication systems, such as: WLAN communication systems, wireless fidelity (Wi-Fi) systems, long term evolution (LTE) systems, LTE frequency division duplex (FDD) systems, LTE time division duplex (TDD), universal mobile telecommunication systems (UMTS), worldwide interoperability for microwave access (WiMAX) communication systems, fifth generation (5G) systems or new radio (NR), sixth generation (6G) systems, internet of things (IoT) networks or vehicle to x (V2X), etc.

[0197] The above-mentioned communication systems applicable to the present application are only illustrative examples, and the communication systems applicable to the present application are not limited thereto. This is uniformly explained here and will not be repeated hereinafter.

[0198] Figure 1 is a schematic diagram of the application scenario applicable to the embodiments of the present application. As Figure 1As shown, the communication method provided in this application is applicable to communication between stations (STA), where a station can be an AP-type station or a non-access point station (none access point station, non-AP STA), which are abbreviated as AP and non-AP station respectively. Specifically, the solution of this application is applicable to communication between an AP and one or more non-AP stations (for example, communication between AP1 and non-AP STA1, non-AP STA2), and is also applicable to communication between APs (for example, communication between AP1 and AP2), and communication between non-AP STAs (for example, communication between non-AP STA2 and non-AP STA3).

[0199] Exemplarily, an access point can be a node for a terminal (such as a mobile phone) to access a wired (or wireless) network, mainly deployed indoors in homes, buildings, and campuses, with a typical coverage radius of dozens of meters 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, and its main function is to connect various wireless network clients together and then connect the wireless network to the Ethernet.

[0200] Specifically, an access point can be a terminal with a WiFi chip or a network device, 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, 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 this application. An access point can be a device supporting the Wi-Fi standard. For example, an access point can also support one or more standards of the IEEE 802.11 series such as 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be, 802.11bn / UHR, 802.11ad, 802.11ay.

[0201] The non-AP station can be a wireless communication chip, a wireless sensor, a wireless communication terminal, etc., and can also be referred to as a user, user equipment (UE), access terminal, user unit, user station, mobile station, mobile device, remote station, remote terminal, mobile device, user terminal, terminal, wireless communication device, user agent or user device. The non-AP station can be a cellular phone, cordless phone, session initiation protocol (SIP) phone, wireless local loop (WLL) station, personal digital assistant (PDA), a handheld device with wireless communication function, a computing device or other processing devices connected to a wireless modem, in-vehicle device, Internet of Things device, wearable device, terminal device in a 5G network, terminal device in a 6G network, or terminal device in a PLMN, etc. The embodiments of the present application do not limit this. The non-AP station can be a device supporting the WLAN standard. For example, the non-AP station can support one or more standards of the IEEE 802.11 series such as 802.11a, 802.11b, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be, 802.11bn / UHR, 802.11ad, 802.11ay, etc.

[0202] Exemplarily, the non-AP station can be a mobile phone, tablet computer, set-top box, smart TV, smart wearable device, in-vehicle communication device, computer, Internet of Things (IoT) node, sensor, smart home, such as a smart camera, smart remote control, smart water meter and electricity meter, and sensors in a smart city, etc.

[0203] The above-mentioned AP or non-AP station can include a transmitter, a receiver, a memory, a processor, etc. Among them, the transmitter and the receiver are respectively used for sending and receiving packet structures, the memory is used for storing signaling information and storing preset values agreed in advance, etc., and the processor is used for parsing signaling information, processing relevant data, etc.

[0204] 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 briefly described first.

[0205] (1) Peak-to-Average Power Ratio / PAPR:

[0206] From the time domain perspective, the amplitude of a wireless signal is constantly changing, so the transmission power of a wireless signal is not constant. PAPR refers to the ratio of the peak power of a signal within a certain period of time to the average power of the signal. Since an OFDM symbol is composed of the superposition of multiple independently modulated subcarrier signals, when the phases of each subcarrier are the same or similar, the superimposed signal will be modulated by signals with the same initial phase, resulting in a large instantaneous power peak and further bringing a high PAPR. Since the dynamic range of a general power amplifier is limited, MIMO-OFDM signals with a large PAPR are very likely to enter the non-linear region of the power amplifier, leading to non-linear distortion of the signal, causing obvious spectral spreading interference and in-band signal distortion, and resulting in a serious decline in the performance of the entire system.

[0207] For example, the calculation formula of PAPR is:

[0208]

[0209] Among them, LTF represents the complete LTF sequence, including single-stream pilots and non-pilots of multiple spatial streams. The single-stream pilot is used for the receiving end to perform phase tracking when receiving signals, to solve the problems of phase noise and residual carrier frequency offset. The non-pilots of multiple spatial streams are used for channel estimation in multi-stream transmission. IFFT(*) represents the inverse Fourier transform operation. Upsampling can be performed during the inverse Fourier transform, such as quadruple upsampling. The upsampling methods include nearest neighbor interpolation, bilinear interpolation, bicubic interpolation, or deconvolution, etc.; |*| represents the absolute value calculation; represents the average operation; max(*) represents the maximum element of the sequence.

[0210] Currently, there are three types of subcarriers, namely: data subcarriers, pilot subcarriers, and unused subcarriers. Among them, the pilot subcarrier is the subcarrier corresponding to the preset sequence placed in an OFDM symbol, and the data subcarrier is the subcarrier for placing the transmitted data. In a communication system, the data subcarrier is used for the transmission of actual data, and the pilot subcarrier is used to provide phase information and parameter tracking to help detect and correct the phase offset of the subcarrier, thereby improving the accuracy of data subcarrier parsing; the unused subcarrier neither belongs to the data subcarrier nor the pilot subcarrier, and it includes the central direct current (DC) subcarrier, guard band, and empty subcarrier.

[0211] (2)LTF (long training field) sequence:

[0212] The LTF sequence can be used for channel estimation at the receiving end. Different bandwidths correspond to their respective LTF sequences. To accurately estimate the spatial stream channel, the WIFI standard proposes to multiply the LTF sequence on the data subcarriers by the P matrix to maintain the orthogonality of the LTF sequences on each spatial stream.

[0213] 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 multiple OFDM symbols, and the rows correspond to multiple spatial streams. The spatial mapping matrix can be expressed as:

[0214]

[0215] where K Pilot represents the index set of pilot subcarriers, R LTF is an N LTF ×N LTF matrix, N LTF represents the number of OFDM symbols of the LTF sequence, and each row of R LTF is equal to the first row of P LTF , that is:

[0216]

[0217]

[0218] Taking the number of OFDM symbols of the LTF sequence as 4 as an example, the corresponding P LTF matrix is:

[0219]

[0220] Taking the number of OFDM symbols of the LTF sequence as 6 as an example, the corresponding P LTF matrix is:

[0221]

[0222] Taking the number of OFDM symbols of the LTF sequence as 8 as an example, the corresponding P LTF matrix is:

[0223]

[0224] Figure 2 is a schematic diagram of the construction of the multi-stream LTF sequence. As Figure 2 shown, 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 referred to Figure 3The dashed box shown. The k-th element LTF in the LTF sequence is carried on the k-th subcarrier k , and the LTF of the n-th OFDM symbol corresponding to the m-th spatial stream is multiplied by the element in the m-th row and n-th column of the P LTF matrix. Therefore, for the frequency-domain signal Y k received by the non-AP STA after experiencing the channel H k , it can be expressed as: Y k = H k P 4*4 LTF k . Since the P LTF matrix is an orthogonal matrix (for example, I is the identity matrix, and * is the conjugate transpose of the matrix), the channel on the k-th subcarrier is like this. In this way, the multiple-input multiple-output (MIMO) channel corresponding to the k-th subcarrier can be estimated.

[0225] 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 that of data subcarriers, but the difference between the two is that the LTF construction method of pilot subcarriers uses the R LTF matrix instead of the P LTF matrix, and each row of the R LTF matrix is equal to the first row of the P LTF matrix. Therefore, the elements of the LTF sequence on data subcarriers and the elements of the LTF sequence on pilot subcarriers may be multiplied by different values, resulting in a change in the PAPR value of the designed LTF sequence. For the specific content of the P LTF matrix and the R LTF matrix, please refer to the 802.11ac standard and will not be elaborated here.

[0226] At present, millimeter waves have become an important direction for future local area networks due to their large bandwidth advantage. However, their high cost limits their commercial development. Integrated millimeter wave technology multiplies the low-frequency baseband signal and transmits it in the millimeter wave band to obtain a higher transmission rate, that is, by multiplexing the low-frequency baseband signal to achieve transmission in the high-frequency millimeter wave band, which can effectively reduce costs and thus has received extensive attention. With the development of MIMO technology, the WLAN standard supports the simultaneous transmission of multiple spatial streams. By adding cyclic shift diversity (CSD) to the spatial streams, the correlation between different spatial streams can be reduced. However, for integrated millimeter waves, when the number of spatial streams is large, the corresponding CSD value added to the spatial streams is large, and the Orthogonal Frequency Division Multiplexing (OFDM) symbols after frequency multiplication are short, and it may not be possible to reduce the correlation between different spatial streams by adding a large CSD value, thus affecting the transmission performance.

[0227] Based on this, the present application provides a communication method and apparatus. By designing a first sequence (such as the LTF sequence) to support the transmission of multiple spatial streams, this first sequence not only has a low PAPR over the entire bandwidth, but also has a low PAPR in multiple spatial stream transmission scenarios. The first sequences corresponding to the multiple spatial stream transmissions are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted by the multiple spatial streams, that is, reduce the transmission interference between the multiple spatial streams, thereby improving the accuracy of the channel estimation result. In addition, the elements of the above-provided LTF sequence take values of 1 or -1, which can simplify the complexity of channel estimation at the receiving end.

[0228] To facilitate the understanding of the embodiments of the present application, the following points are first explained.

[0229] 1) In the present application, if there is no special explanation and logical conflict, the terms and / or descriptions between different embodiments are consistent and can be referenced to each other. The technical features in different embodiments can be combined to form new embodiments according to their internal logical relationships.

[0230] 2) In this application, "at least one" means one or more, and "a plurality" means two or more. "And / or" describes the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone, where A and B can be singular or plural. In the written description of this application, the character " / " generally represents an "or" relationship between the associated objects before and after. "At least one (item)" or its similar expression refers to any combination of these items, including any combination of single item(s) or plural item(s). For example, at least one (item) of a, b, and c can represent: 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.

[0231] 3) In this application, "first", "second", and various numerical designations are for the convenience of description and do not limit the scope of the embodiments of this application. For example, to distinguish different messages, etc., rather than for describing a specific order or sequence. It should be understood that the objects described in this way can be interchanged under appropriate circumstances so as to be able to describe the solutions other than the embodiments of this application.

[0232] 4) In this application, the terms "comprise" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products, or devices.

[0233] 5) In this application, "for indicating" can include for direct indication and for indirect indication. When describing that a certain indication information is for indicating A, it can include that the indication information directly indicates A or indirectly indicates A, and does not mean that A must be carried in the indication information.

[0234] 6) In this application, "communication" can also be described as "data transmission", "information transmission", "data processing", etc. "Transmission" includes "sending" and "receiving".

[0235] The technical solutions provided by this application will be described in detail below with reference to the accompanying drawings. The embodiments of this application can be applied to multiple different scenarios, including Figure 1 the scenario shown, but not limited to this scenario.

[0236] It should be understood that the specific structure of the execution entity of the method provided in the embodiments of the present application is not particularly limited by the embodiments shown below. As long as a program recording the code of the method provided in the embodiments of the present application can be run to communicate according to the method provided in the embodiments of the present application. For example, the execution entity of the method provided in the embodiments of the present application can be a receiving-end device or a sending-end device, or a functional module in the receiving-end device or the sending-end device that can call and execute the program.

[0237] Without loss of generality, the communication method provided in the embodiments of the present application will be described in detail below by taking the interaction between the sending end and the receiving end as an example. The sending end involved in the embodiments of the present application can be an access point (AP) or a non-access point (non-AP) station (STA); the receiving end can be an AP or an STA, and the present application does not make any limitations in this regard. For example, one communication scenario can be that the sending end is an AP and the receiving end is an STA; one communication scenario can be that the sending end is an STA and the receiving end is an AP; one communication scenario can be that the sending end is an STA and the receiving end is an STA; one communication scenario can be that the sending end is an AP and the receiving end is an AP. For the convenience of understanding and description, the following embodiments will be described by taking the sending end as an AP and the receiving end as an STA as an example.

[0238] Figure 3 It is a schematic flowchart of a communication method 300 provided in the embodiments of the present application. As Figure 3 shown, it includes the following multiple steps.

[0239] S310, the sending end generates a PPDU.

[0240] Wherein, the PPDU includes a first field, and the first field is used to carry a part or all of a first sequence, and a part or all of the first sequence is used for the receiving end to perform channel estimation.

[0241] For example, when the PPDU is a non-OFDMA PPDU (e.g., a single user (SU) PPDU or a full-bandwidth multi-user (MU) MIMO PPDU), the first field of the non-OFDMA PPDU carries all of a first sequence, and all of the first sequence is used for a receiving end to estimate channel over the full bandwidth. For example, when the PPDU is an orthogonal frequency division multiple access (OFDMA) PPDU (e.g., an MU PPDU or a TB PPDU), the first field of the OFDMA PPDU carries all or part of the first sequence; for example, if a certain resource unit (RU) for OFDMA is not allocated to a user, the corresponding part of the first sequence corresponding to this RU is set to 0. In other words, at this time, the first field of the OFDMA PPDU carries part of the first sequence because the corresponding part of the first sequence corresponding to this RU is set to 0.

[0242] Exemplarily, the first sequence may be an LTF sequence. In a high-frequency band, such as in a millimeter-wave system, the first sequence may also be referred to as a CEF sequence. For ease of description, embodiments of the present application are described by taking the LTF sequence as an example.

[0243] Optionally, the PPDU may be used for high-frequency millimeter-wave communication, or in other words, the subcarrier spacing for transmitting the PPDU in embodiments of the present application is greater than or equal to 312.5 KHz.

[0244] In one implementation, the first sequence may include a first base sequence and a second base sequence, and the second base sequence and the first base sequence satisfy a relationship of alternating inversion and reverse order.

[0245] Exemplarily, the first base sequence is located on the high-frequency side of the center frequency band of the PPDU bandwidth, and the second base sequence is located on the low-frequency side of the center frequency band of the PPDU bandwidth.

[0246] It should be understood that high frequency and low frequency are relative to the center frequency. The high-frequency side means greater than or higher than the center frequency of the PPDU bandwidth in terms of frequency, and the low-frequency side means less than or lower than the center frequency of the PPDU bandwidth in terms of frequency. For example, assuming the center frequency of the PPDU bandwidth is 0, high frequency represents a frequency greater than 0, and low frequency represents a frequency less than 0.

[0247] In the present application, the first base sequence and the second base sequence have the same length; or in other words, the first base sequence and the second base sequence contain the same number of elements.

[0248] Next, an example is given to illustrate the relationship that the second base sequence and the first base sequence satisfy alternate inversion and reverse order.

[0249] In the first example, the first base sequence s(i) and the second base sequence s A (i) satisfy the relationship of alternate inversion and reverse order, including:

[0250] s A (i) = s(j - i)(-1) j-i , i = 0, 1, 2, …, j;

[0251] where i represents the index of an element of the first base sequence or the second base sequence. The first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

[0252] In the second example, the first base sequence s(i) and the second base sequence -s A (i) satisfy the relationship of alternate inversion and reverse order, including:

[0253] -s A (i) = -s(j - i)(-1) j-i , i = 0, 1, 2, …, j;

[0254] where i represents the index of an element of the first base sequence or the second base sequence. The first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

[0255] In other words, s A (i) is the sequence obtained by inverting the elements at the positions corresponding to the even indices of the sequence s(i) and then reversing the order, and reversing the elements at the positions corresponding to the odd indices of s(i); or, -s A (i) is the sequence obtained by inverting the elements at the positions corresponding to the odd indices of the sequence s(i) and then reversing the order, and reversing the elements at the positions corresponding to the even indices of s(i); or, s A (i) is the sequence obtained by inverting the elements at the positions corresponding to the even indices after reversing the sequence s(i), and keeping the elements at the positions corresponding to the odd indices of s(i) unchanged. -s A (i) is the sequence obtained by inverting the elements at the positions corresponding to the odd indices after reversing the sequence s(i), and keeping the elements at the positions corresponding to the even indices of s(i) unchanged.

[0256] Optionally, the elements of the first base sequence and the second base sequence take values of 1 or -1, and this implementation method can simplify the complexity of channel estimation at the receiving end.

[0257] Optionally, there are an odd number of 0 elements between the first base sequence and the second base sequence. For example, there may be 1 or 3 0 elements between the first base sequence and the second base sequence, and the present application does not limit this.

[0258] It should be understood that for a sequence of length K its aperiodic autocorrelation function satisfies: If the sequence and have element values of 1 or -1, and its aperiodic autocorrelation function satisfies: then the sequences and constitute a pair of Gray complementary pair sequences, which can also be referred to as Gray sequence pairs, or Gray complementary sequences, or Gray complementary sequence pairs, etc.

[0259] Optionally, the first base sequence can be determined according to the Gray sequence pair, the first short sequence, and the second short sequence, where the Gray sequence pair satisfies: and The first base sequence is any one of the following:

[0260] Or,

[0261]

[0262] where, is the first short sequence, is the second short sequence, K is an integer greater than or equal to 1, a0, a1,..., a K-1 , b0, b1,..., b K-1 are all integers greater than 0. Assuming the length of the first base sequence is j + 1, or rather the first base sequence includes j + 1 elements, then the length of the first short sequence and the second short sequence is j / 2K. For example, and Or,

[0263] In the embodiments of the present application, the first sequence is designed to support multiple spatial stream transmissions. It should be understood that this first sequence not only has a low PAPR over the entire bandwidth, but also can still ensure low PAPR performance in multiple spatial stream transmission scenarios to improve the accuracy of channel estimation. This first sequence can avoid the influence of unnecessary beamforming when supporting up to 8 or fewer spatial stream transmissions, that is, the signal transmissions between multiple spatial streams do not interfere with each other, thereby ensuring the system transmission performance. In addition, when the element values of the first sequence are 1 or -1, it can simplify the complexity of channel estimation at the receiving end.

[0264] Hereinafter, taking the first bandwidth, the second bandwidth, and the third bandwidth as the bandwidths of the PPDU respectively, the first sequence (such as the LTF sequence) of the PPDU will be specifically described.

[0265] (1) The LTF sequence of the PPDU with the first bandwidth.

[0266] In a possible implementation, the PPDU can be transmitted using the first bandwidth, and the first bandwidth can be a bandwidth in the high frequency range, that is, the PPDU can be used for high-frequency millimeter-wave communication. For example, the first bandwidth can be a bandwidth obtained by multiplying the 20 MHz bandwidth by a frequency multiplication factor (such as 4 times, or 8 times, or 16 times, etc.). At this time, the first bandwidth can be 80 MHz, or 160 MHz, or 320 MHz bandwidth, etc.

[0267] Exemplarily, the set of position indices of the subcarriers corresponding to the LTF sequence is {-28, -27, …, -1, 0, 1, …, 27, 28}, that is, the length of the LTF sequence is 57. At this time, the LTF sequence can be expressed as:

[0268]

[0269] Or,

[0270]

[0271] Wherein, represents the first base sequence, and the set of position indices of the subcarriers corresponding to the first base sequence is {1, …, 27, 28}, is a sequence with a length of 28, or rather, contains 28 elements. represents the second base sequence, and the set of position indices of the subcarriers corresponding to the second base sequence is {-28, -27, …, -1}, is a sequence with a length of 28, or rather, contains 28 elements.

[0272] Exemplarily, the elements of the sequences and take values of 1 or -1.

[0273] It should be understood that and satisfy the relationship of alternating sign change and reverse order, that is, s A (i) = s(27 - i)(-1) 27-i , where s(i) represents the first base sequence the i-th element in, where i = 0, 1, 2, …, 27. Additionally, the 0 element in the LTF sequence of the above formula (1) or (2) can correspond to the DC subcarrier (indicating that the position index of the subcarrier is 0) or the adjacent subcarriers.

[0274] In the first example, for the above formula (1), since is a sequence of length 28 and the element values are 1 or -1, the first base sequence can have 2 28 cases, corresponding to 2 28 LTF sequences. By traversing all possible LTF sequences, two mutually orthogonal LTF sequences can be determined therefrom, i.e., see the following formulas (3)-(4).

[0275] LTF -28,28 = {-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}; (3)

[0276] LTF -28,28 = {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}; (4)

[0277] In the second example, for the above formula (2), since is a sequence of length 28 and the element values are 1 or -1, the first base sequence can have 2 28 cases, corresponding to 2 28 LTF sequences. By traversing all possible LTF sequences, two mutually orthogonal LTF sequences can be determined therefrom, i.e., see the following formulas (5)-(6).

[0278] LTF -28,28= {-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}; (5)

[0279] LTF -28,28 = {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}; (6)

[0280] It should be understood that since the LTF sequences of the above formulas (1) and (2) are orthogonal to each other, it indicates that the LTF sequences of the above formulas (3)-(6) are orthogonal to each other. In addition, since the LTF sequence of formula (1) and its reverse sequence are orthogonal to each other, and the LTF sequence of formula (2) and its reverse sequence are orthogonal to each other, the reverse sequences of the LTF sequences of the above formulas (3)-(6) are also orthogonal to each other, that is, please refer to the following formulas (7)-(10) respectively.

[0281] LTF -28,28 = {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}; (7)

[0282] LTF -28,28 = {-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}; (8)

[0283] LTF -28,28= {-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}; (9)

[0284] LTF -28,28 = {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}; (10)

[0285] Based on the LTF sequences of the above formulas (3)-(10), Table 1 and Table 2 respectively show the cross-correlation values between the eight LTF sequences and the PAPR values of the eight LTF sequences. For ease of description, the LTF sequences of the above formulas (3)-(10) are represented by LTF1, LTF2, LTF3, LTF4, LTF5, LTF6, LTF7, and LTF8 respectively.

[0286] Table 1

[0287] <![CDATA[LTF1]]> <![CDATA[LTF2]]> <![CDATA[LTF3]]> <![CDATA[LTF4]]> <![CDATA[LTF5]]> <![CDATA[LTF6]]> <![CDATA[LTF7]]> <![CDATA[LTF8]]> <![CDATA[LTF1]]> 56 0 0 0 0 0 0 0 <![CDATA[LTF2]]> 0 56 0 0 0 0 0 0 <![CDATA[LTF3]]> 0 0 56 0 0 0 0 0 <![CDATA[LTF4]]> 0 0 0 56 0 0 0 0 <![CDATA[LTF5]]> 0 0 0 0 56 0 0 0 <![CDATA[LTF6]]> 0 0 0 0 0 56 0 0 <![CDATA[LTF7]]> 0 0 0 0 0 0 56 0 <![CDATA[LTF8]]> 0 0 0 0 0 0 0 56

[0288] It can be seen from Table 1 that the cross-correlation value between any two different LTF sequences among the eight LTF sequences above is 0, which means that any two different LTF sequences are orthogonal to each other. In the case of supporting up to eight spatial stream transmissions, the influence brought by unnecessary beamforming can be avoided, that is, the signal transmissions between different spatial streams do not interfere with each other, so that the system transmission performance can be guaranteed. In addition, since the element values of the LTF sequences provided by the above formulas (3)-(10) are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0289] Table 2

[0290] PAPR (dB) <![CDATA[LTF1]]> 2.13 <![CDATA[LTF2]]> 2.31 <![CDATA[LTF3]]> 1.8 <![CDATA[LTF4]]> 2.26 <![CDATA[LTF5]]> 2.13 <![CDATA[LTF6]]> 2.31 <![CDATA[LTF7]]> 1.8 <![CDATA[LTF8]]> 2.26

[0291] It can be seen from Table 2 that compared with the LTF of the existing PPDU -28,28The PAPR value of the sequence (such as 3.72 dB), and the PAPR value of any one of the above 8 LTF sequences is less than 3.72 dB. Among them, the PAPR values of LTF3 and LTF7 are the lowest. The above 8 LTF sequences all have a low PAPR under the first bandwidth, and can still ensure low PAPR performance in multiple spatial stream transmission scenarios, which can reduce the impact of nonlinear distortion on the channel estimation result in a high-frequency band (such as millimeter wave) system, thereby improving the accuracy of channel estimation.

[0292] (2) LTF sequences of the PPDU with the second bandwidth.

[0293] In a possible implementation, the PPDU can be transmitted using the second bandwidth, and the second bandwidth can be a bandwidth in the high frequency, that is, the PPDU can be used for high-frequency millimeter wave communication. For example, the second bandwidth can be a bandwidth obtained by multiplying the 40 MHz bandwidth by a frequency multiplier (such as 4 times, or 8 times, or 16 times, etc.). At this time, the second bandwidth can be 160 MHz, or 320 MHz, or 640 MHz bandwidth, etc.

[0294] Exemplarily, the set of position indices of the subcarriers corresponding to the LTF sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, that is, the length of the LTF sequence is 117. At this time, the LTF sequence can be expressed as:

[0295]

[0296] Or,

[0297]

[0298] Wherein, represents the first base sequence, and the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 57, 58}, is a sequence with a length of 57, or rather, contains 57 elements. represents the second base sequence, and the set of position indices of the subcarriers corresponding to the second base sequence is {-58, -57, …, -2}, is a sequence with a length of 57, or rather, contains 57 elements.

[0299] Exemplarily, the first base sequence can be expressed as: Wherein, the sequence and the sequence represent a Gray sequence pair, represents the first short sequence, Represents the second shortest sequence, due to the first base sequence having a length of 57, then and both have a length of 14.

[0300] Exemplarily, for sequences and , the element values are 1 or -1, and for sequences and , the element values are 1 or -1.

[0301] It should be understood that and satisfy the relationship of alternating sign change and reverse order, i.e., s A (i) = s(56 - i)(-1) 56-i , where s(i) represents the i-th element in the first base sequence , and i = 0, 1, 2, …, 56. Additionally, the 0 element in the LTF sequence of the above formula (11) or (12) corresponds to the DC subcarrier (indicating that the position index of the subcarrier is 0) or adjacent subcarriers.

[0302] In the first example, when the Gray sequence pair and is considered, since and are both sequences of length 14 and the element values are 1 or -1, then the first shortest sequence can have 2 14 cases, and the second shortest sequence can have 2 14 cases. By traversing, it can be determined that when and , the corresponding two LTF sequences with the minimum PAPR can be obtained, i.e., see the following formulas (13) - (14).

[0303] 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, 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, -1}; (13)

[0304] 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, 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, -1, -1, -1, -1}; (14)

[0305] In the second example, when the Gray sequence pair and Since and are both sequences of length 14, and the element values are 1 or -1, the first shortest sequence can have 2 14 cases, and the second shortest sequence can have 2 14 cases. By traversing, it can be determined that when and correspondingly, two LTF sequences with the minimum PAPR can be obtained, that is, see the following formulas (15)-(16).

[0306] 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, 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, 1, 1, 1, -1}; (15)

[0307] 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, 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, -1, -1, -1, -1}; (16)

[0308] It should be understood that since the LTF sequences of the above formulas (11) and (12) are orthogonal to each other, it indicates that the LTF sequences of the above formulas (13)-(16) are orthogonal to each other. Additionally, since the Gray sequences used above and are orthogonal to each other, the LTF sequence of formula (11) and its reverse sequence are orthogonal to each other, and the LTF sequence of formula (12) and its reverse sequence are orthogonal to each other, then the reverse sequences of the LTF sequences of the above formulas (13)-(16) are also orthogonal to each other, that is, refer to the following formulas (17)-(20) respectively.

[0309] 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, 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, 1, -1, -1}; (17)

[0310] 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, 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, -1, 1, -1, 1}; (18)

[0311] 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, 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, -1, 1, -1, -1}; (19)

[0312] 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, 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, -1, 1, -1, 1}。 (20)

[0313] Based on the LTF sequences of the above formulas (13)-(20), Table 3 and Table 4 respectively show the cross-correlation values between these 8 LTF sequences, and the PAPR values of these 8 LTF sequences. For ease of description, the LTF sequences of the above formulas (13)-(20) are represented by LTF1, LTF2, LTF3, LTF4, LTF5, LTF6, LTF7, and LTF8 respectively.

[0314] Table 3

[0315] <![CDATA[LTF1]]> <![CDATA[LTF2]]> <![CDATA[LTF3]]> <![CDATA[LTF4]]> <![CDATA[LTF5]]> <![CDATA[LTF6]]> <![CDATA[LTF7]]> <![CDATA[LTF8]]> <![CDATA[LTF1]]> 114 0 2 0 2 0 2 0 <![CDATA[LTF2]]> 0 114 0 2 0 -2 0 -2 <![CDATA[LTF3]]> 2 0 114 0 2 0 2 0 <![CDATA[LTF4]]> 0 2 0 114 0 -2 0 -2 <![CDATA[LTF5]]> 2 0 2 0 114 0 2 0 <![CDATA[LTF6]]> 0 -2 0 -2 0 114 0 2 <![CDATA[LTF7]]> 2 0 2 0 2 0 114 0 <![CDATA[LTF8]]> 0 -2 0 -2 0 2 0 114

[0316] As can be seen from Table 3, the cross-correlation value between any two different LTF sequences among the above 8 LTF sequences is equal to 0 or close to 0, which means that any two different LTF sequences are orthogonal or approximately orthogonal to each other. In the case of supporting up to 8 spatial stream transmissions, it is possible to reduce the impact of unnecessary beamforming, that is, the signal transmissions between different spatial streams do not interfere with each other or have little interference, thus ensuring the system transmission performance. In addition, since the element values of the LTF sequences provided by the above formulas (13)-(20) are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0317] Table 4

[0318] PAPR (dB) <![CDATA[LTF1]]> 2.97 <![CDATA[LTF2]]> 2.97 <![CDATA[LTF3]]> 2.86 <![CDATA[LTF4]]> 2.97 <![CDATA[LTF5]]> 2.97 <![CDATA[LTF6]]> 2.97 <![CDATA[LTF7]]> 2.86 <![CDATA[LTF8]]> 2.97

[0319] As can be seen from Table 4, compared with the LTF of the existing PPDU -58,58The PAPR value of the sequence (such as 5.77 dB), and the PAPR value of any one of the above 8 LTF sequences is less than 5.77 dB. Among them, the PAPR values of LTF3 and LTF7 are the lowest. The above 8 LTF sequences all have a low PAPR under the second bandwidth, and can still ensure low PAPR performance in multiple spatial stream transmission scenarios, which can reduce the influence of nonlinear distortion on the channel estimation result in a high-frequency band (such as millimeter wave) system, thereby improving the accuracy of channel estimation.

[0320] (3) LTF sequences of the PPDU in the third bandwidth.

[0321] In a possible implementation, the PPDU can be transmitted using the third bandwidth, and the third bandwidth can be a bandwidth in the high frequency, that is, the PPDU can be used for high-frequency millimeter wave communication. For example, the third bandwidth is a bandwidth obtained by multiplying the 80 MHz bandwidth by a frequency multiple (such as 2 times, or 4 times, or 8 times, etc.). At this time, the third bandwidth can be 160 MHz, or 320 MHz, or 640 MHz bandwidth, etc.

[0322] Exemplarily, the set of position indices of the subcarriers corresponding to the LTF sequence is {-122, -121, …, -1, 0, 1, …, 121, 122}, that is, the length of the LTF sequence is 245. At this time, the LTF sequence can be expressed as:

[0323]

[0324] Or,

[0325]

[0326] Where, represents the first base sequence, and the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 121, 122}, is a sequence with a length of 121, or rather, contains 121 elements. represents the second base sequence, and the set of position indices of the subcarriers corresponding to the second base sequence is {-122, -121, …, -2}, is a sequence with a length of 121, or rather, contains 121 elements.

[0327] Exemplarily, the first base sequence can be expressed as: Where, the sequence and the sequence represent a Gray sequence pair, represents the first short sequence, represents the second shortest sequence. Due to the first base sequence having a length of 121, the sequences and both have a length of 15.

[0328] Exemplarily, the elements of the sequences and take values of 1 or -1, and the elements of the sequences and take values of 1 or -1.

[0329] It should be understood that and satisfy the relationship of alternating sign inversion and alternating sign inversion, that is, s A (i) = s(120 - i)(-1) 120-i , where s(i) represents the i-th element in , i = 0, 1, 2,..., 120. Additionally, the 0 element in the LTF sequence of the above formula (21) or (22) corresponds to the DC subcarrier (indicating that the position index of the subcarrier is 0) or adjacent subcarriers.

[0330] In the first example, when the Gray sequence pair and is considered, since and are both sequences of length 15 and the elements take values of 1 or -1, the first shortest sequence can have 2 15 cases, and the second shortest sequence can have 2 15 cases. By traversing, it can be determined that when and , the corresponding two LTF sequences with the minimum PAPR can be obtained, that is, see the following formulas (23)-(24).

[0331] LTF -122,122= {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, 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, -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}; (23)

[0332] LTF -122,122= {-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, -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, 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}. (24)

[0333] In the second example, when the Gray sequence pair and Since and are both sequences of length 15 and the elements take values of 1 or -1, the first shortest sequence can have 2 15 cases, and the second shortest sequence can have 2 15 cases. By traversing, it can be determined that when and two LTF sequences with the minimum PAPR can be obtained, that is, see the following formulas (25)-(26).

[0334] LTF -122,122={-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, -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, -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}; (25)

[0335] LTF -122,122= {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, 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, -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, -1, -1, 1, -1, -1, -1, -1}; (26)

[0336] It should be understood that since the LTF sequences of the above formulas (21) and (22) are orthogonal to each other, it indicates that the LTF sequences of the above formulas (23)-(26) are orthogonal to each other. Additionally, since the Gray sequences used above and are orthogonal to each other, the LTF sequence of formula (21) and its reverse sequence are orthogonal to each other, and the LTF sequence of formula (22) and its reverse sequence are orthogonal to each other, then the reverse sequences of the LTF sequences of the above formulas (23)-(26) are also orthogonal to each other, that is, refer to the following formulas (27)-(30) respectively.

[0337] LTF -122,122= {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, 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, 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, -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}; (27)

[0338] LTF -122,122={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, -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, -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, -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}; (28)

[0339] LTF -122,122={-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, -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, -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, -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, -1, -1, -1, -1, -1, -1, 1, 1, -1}; (29)

[0340] LTF -122,122= {-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, -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, -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, 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}. (30)

[0341] Based on the LTF sequences of the above formulas (23)-(30), Table 5 and Table 6 respectively show the cross-correlation values between the 8 LTF sequences and the PAPR values of the 8 LTF sequences. For ease of description, the LTF sequences of the above formulas (23)-(30) are respectively represented by LTF1, LTF2, LTF3, LTF4, LTF5, LTF6, LTF7, and LTF8.

[0342] Table 5

[0343] <![CDATA[LTF1]]> <![CDATA[LTF2]]> <![CDATA[LTF3]]> <![CDATA[LTF4]]> <![CDATA[LTF5]]> <![CDATA[LTF6]]> <![CDATA[LTF7]]> <![CDATA[LTF8]]> <![CDATA[LTF1]]> 242 0 -2 0 2 0 -2 0 <![CDATA[LTF2]]> 0 242 0 -2 0 -2 0 2 <![CDATA[LTF3]]> -2 0 242 0 -2 0 2 0 <![CDATA[LTF4]]> 0 -2 0 242 0 2 0 -2 <![CDATA[LTF5]]> 2 0 -2 0 242 0 -2 0 <![CDATA[LTF6]]> 0 -2 0 2 0 242 0 -2 <![CDATA[LTF7]]> -2 0 2 0 -2 0 242 0 <![CDATA[LTF8]]> 0 2 0 -2 0 -2 0 242

[0344] As can be seen from Table 5, the cross-correlation values between any two different LTF sequences among the above 8 LTF sequences are equal to 0 or close to 0, which means that any two different LTF sequences are orthogonal or approximately orthogonal to each other. In the case of supporting up to 8 spatial stream transmissions, it is possible to reduce the impact of unnecessary beamforming, that is, the signal transmissions between different spatial streams do not interfere with each other or have little interference, thus ensuring the transmission performance. In addition, since the element values of the LTF sequences provided by the above formulas (23)-(30) are 1 or -1, the complexity of channel estimation at the receiving end can be simplified.

[0345] Table 6

[0346] PAPR (dB) <![CDATA[LTF1]]> 3.28 <![CDATA[LTF2]]> 3.33 <![CDATA[LTF3]]> 3.23 <![CDATA[LTF4]]> 3.31 <![CDATA[LTF5]]> 3.28 <![CDATA[LTF6]]> 3.33 <![CDATA[LTF7]]> 3.23 <![CDATA[LTF8]]> 3.31

[0347] As can be seen from Table 6, compared with the PAPR value (such as 8.63 dB) of the LTF -122,122 sequence of the existing PPDU, the PAPR value of any one of the above 8 LTF sequences is less than 8.63 dB. Among them, the PAPR values of LTF3 and LTF7 are the lowest. The above 8 LTF sequences all have a low PAPR under the third bandwidth, and can still ensure low PAPR performance in multiple spatial stream transmission scenarios, which can reduce the impact of nonlinear distortion on the channel estimation result in high-frequency bands (such as millimeter waves) systems, thereby improving the accuracy of channel estimation.

[0348] The above takes the first bandwidth, or the second bandwidth, or the third bandwidth as the bandwidth of the PPDU, that is, taking the bandwidth before frequency doubling as 20 MHz, or 40 MHz, or 80 MHz as an example to illustrate the design of the LTF sequence of the PPDU. It is only an example given for easy understanding. The present application does not limit the specific size of the bandwidth before frequency doubling. For example, it can also be 60 MHz. At this time, the bandwidth obtained after frequency doubling (such as 3 times, or 4 times, or 6 times, etc.) of the 60 MHz bandwidth (such as 180 MHz, or 240 MHz, or 360 MHz, etc.) is the transmission bandwidth of the PPDU, and the design of the corresponding LTF sequence can refer to the above implementation method, which will not be specifically described here.

[0349] S320, the sending end sends the PPDU to the receiving end. Correspondingly, the receiving end receives the PPDU from the sending end.

[0350] Exemplarily, taking the sending end as an AP and the receiving end as an STA as an example, the STA can be any one of one or more STAs. In this embodiment, there is no limitation on the transmission method of the PPDU, and the description of the PPDU transmission method between the AP and the STA specified in the existing protocol or future protocol can be referred to, which will not be elaborated here.

[0351] In one example, if the transmitting end is an AP and the receiving end is a STA, the AP can send downlink information (such as downlink data) to the STA based on the frequency resource.

[0352] In another example, if the transmitting end is a STA and the receiving end is an AP, the STA can send uplink information (such as uplink data) to the AP based on the frequency resource.

[0353] Optionally, the transmitting end is an AP and the receiving end is an AP; or, the transmitting end is a STA and the receiving end is a STA. This application does not make any limitations in this regard.

[0354] It should be noted that, in this embodiment, for the sake of convenience in description, the two parties of communication are referred to as an AP and a STA. However, it should be understood that the names of the communication devices in this embodiment are not limited, as long as they can implement the corresponding functions. For example, the AP can be replaced by an access point, a base station, or a terminal device, etc., and the STA can be replaced by a non-AP station, a non-AP STA, a user, a terminal device, etc. Examples are not given one by one here.

[0355] S330. The receiving end performs channel estimation according to part or all of the first sequence that has passed through the wireless channel and a preset first sequence.

[0356] It should be understood that the preset first sequence is the first sequence in step S310, that is, the preset first sequence includes a first base sequence and a second base sequence, and the second base sequence and the first base sequence satisfy the relationship of alternating inversion and reverse order. The preset first sequence will not be elaborated here, and the entire description of the first sequence in the above step S310 can be cited.

[0357] The receiving end receives the PPDU, parses the PPDU to obtain part or all of the first sequence that has passed through the wireless channel, and compares it with the preset first sequence to complete channel estimation. Among them, the specific implementation method of channel estimation can refer to the existing solutions and will not be described here.

[0358] Based on the above technical solution, an LTF sequence with a lower PAPR is designed. This LTF sequence not only has a lower PAPR over the entire bandwidth, but also has a lower PAPR in multiple spatial stream transmission scenarios. The first sequences corresponding to multiple spatial stream transmissions are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted in multiple spatial streams, that is, reduce the transmission interference between multiple spatial streams, improve the accuracy of the channel estimation result, and ensure the system transmission performance. In addition, the elements of the LTF sequence provided above take values of 1 or -1, which can simplify the complexity of channel estimation at the receiving end.

[0359] Figure 4 It is a schematic flowchart of another communication method 400 provided by the embodiment of the present application, asFigure 4 As shown, it includes the following multiple steps.

[0360] S410, the sending end generates a PPDU.

[0361] Among them, the PPDU includes a first field, and the first field is used to carry part or all of a first sequence. Part or all of the first sequence is used by the receiving end for channel estimation. For the specific interpretation of part or all of the first sequence, reference can be made to the relevant description in step S310 of the above method 300.

[0362] Exemplarily, the first sequence can be an LTF sequence. In a high-frequency band, such as a millimeter-wave system, the first sequence can also be referred to as a CEF sequence. For ease of description, the embodiments of the present application take the LTF sequence as an example for illustration. Optionally, the PPDU can be used for high-frequency millimeter-wave communication, or in other words, the subcarrier spacing for transmitting the PPDU in the embodiments of the present application is greater than or equal to 312.5 KHz.

[0363] Exemplarily, taking the first bandwidth, the second bandwidth, and the third bandwidth as the bandwidth of the PPDU respectively, the first sequence can refer to any one of formulas (3)-(10) in the above method 300, or any one of formulas (13)-(20), or any one of formulas (23)-(30), which will not be elaborated here. For the relevant descriptions of the first bandwidth, the second bandwidth, and the third bandwidth, reference can be made to the above description.

[0364] Optionally, the present application does not limit the specific size of the bandwidth before frequency multiplication. For example, it can also be 60 MHz. At this time, the bandwidth obtained after frequency multiplication (such as 3 times, or 4 times, or 6 times, etc.) of the 60 MHz bandwidth (such as 180 MHz, or 240 MHz, or 360 MHz, etc.) is the transmission bandwidth of the PPDU, and the design of the corresponding LTF sequence can refer to the above implementation method, which will not be specifically described here.

[0365] S420, the sending end sends the PPDU to the receiving end. Correspondingly, the receiving end receives the PPDU from the sending end.

[0366] The specific implementation method can refer to the relevant description in step S320 of the above method 300.

[0367] S430, the receiving end performs channel estimation according to part or all of the first sequence that has passed through the wireless channel and a preset first sequence.

[0368] It should be understood that the preset first sequence is the first sequence in step S410. The preset first sequence will not be elaborated here and the entire description of the first sequence in the above step S410 can be cited. Exemplarily, the receiving end receives a PPDU, parses the PPDU to obtain part or all of the first sequence passing through the wireless channel, and compares it with the preset first sequence to complete channel estimation. The specific implementation manner of channel estimation can refer to existing solutions and will not be described here.

[0369] Based on the above technical solution, an LTF sequence with a lower PAPR is designed. This LTF sequence not only has a lower PAPR across the entire bandwidth, but also has a lower PAPR in multiple spatial stream transmission scenarios. The first sequences corresponding to multiple spatial stream transmissions are orthogonal or approximately orthogonal to each other, which can reduce the correlation between the data transmitted in multiple spatial streams, that is, reduce the transmission interference between multiple spatial streams, improve the accuracy of the channel estimation result, and ensure the system transmission performance. In addition, the elements of the above-provided LTF sequence take values of 1 or -1, which can simplify the complexity of channel estimation at the receiving end.

[0370] The method embodiments of the present application have been described above. Next, the corresponding apparatus embodiments will be briefly introduced. It should be understood that the description of the apparatus embodiments corresponds to the description of the method embodiments. Therefore, the parts not described in detail can be referred to the previous method embodiments.

[0371] Figure 5 is a schematic diagram of a communication device 1000 provided by an embodiment of the present application. As Figure 5 shown, the communication device 1000 includes a processing module 1001 and a communication module 1002. The communication device 1000 can be a sending end, or a communication device applied to the sending end, or used in matching with the sending end and capable of implementing the method executed by the sending end, such as a chip, a chip system or a circuit. Or, the communication device 1000 can be a receiving end, or a communication device applied to the receiving end, or used in matching with the receiving end and capable of implementing the method executed by the receiving end, such as a chip, a chip system or a circuit.

[0372] Among them, the communication module can also be referred to as a transceiver module, a transceiver, a transceiver, or a transceiver device, etc. The processing module can also be referred to as a processor, a processing board, a processing unit, or a processing device, etc. Optionally, the communication module is used to execute the sending operation and the receiving operation of the sending end or the receiving end in the above method. The device in the communication module for implementing the receiving function can be regarded as a receiving unit, and the device in the communication module for implementing the sending function can be regarded as a sending unit, that is, the communication module includes a receiving unit and a sending unit.

[0373] When the communication device 1000 is applied to the sending end, the processing module 1001 can be used to implement the processing functions of the sending end in the above embodiments, and the communication module 1002 can be used to implement the sending and receiving functions of the sending end in the above embodiments.

[0374] When the communication device 1000 is applied to the receiving end, the processing module 1001 can be used to implement the processing functions of the receiving end in the above embodiments, and the communication module 1002 can be used to implement the sending and receiving functions of the sending end in the above embodiments.

[0375] In addition, it should be noted that the foregoing communication module and / or processing module can be implemented by a virtual module. For example, the processing module can be implemented by a software functional unit or a virtual device, and the communication module can be implemented by a software function or a virtual device. Alternatively, the processing module or the communication module can also be implemented by a physical device. For example, if the device is implemented by a chip / circuit (such as an integrated circuit or a logic circuit, etc.). The communication module can be an input / output circuit and / or a communication interface, performing input operations (corresponding to the foregoing receiving operations) and output operations (corresponding to the foregoing sending operations); the processing module is an integrated processor or a microprocessor or a circuit (such as an integrated circuit or a logic circuit, etc.).

[0376] The division of modules in this application is illustrative, merely a logical function division. In actual implementation, there may be other division methods. In addition, in each example of this application, each functional module can be integrated in a processor, or can exist independently physically, or two or more modules can be integrated in one module. The above integrated modules can be implemented in the form of hardware or in the form of software functional modules.

[0377] Figure 6 It is a schematic diagram of another communication device 2000 provided by an embodiment of the present application. As Figure 6 shown, optionally, the communication device 2000 can be a chip or a chip system. Optionally, in the present application, the chip system can be composed of chips, or can include chips and other discrete devices.

[0378] The communication device 2000 can be used to implement the functions of any network element (such as a receiving end or a transmitting end, optionally, the receiving end is a location management function network element, and the transmitting end is an access network device or a terminal device) in the communication system described in the foregoing examples. The communication device 2000 may include at least one processor 2010. Optionally, the processor 2010 is coupled to a memory, which may be located inside the device, or the memory may be integrated with the processor, or the memory may also be located outside the device. For example, the communication device 2000 may further include at least one memory 2020. The memory 2020 stores the necessary computer programs, computer programs or instructions and / or data in any of the above examples; the processor 2010 may execute the computer programs stored in the memory 2020 to complete the methods in any of the above examples.

[0379] The communication device 2000 may further include a communication interface 2030, and the communication device 2000 can interact with other devices through the communication interface 2030. Exemplarily, the communication interface 2030 may be a transceiver, a circuit, a bus, a module, a pin or other types of communication interfaces. When the communication device 2000 is a chip-like device or a circuit, the communication interface 2030 in the device 2000 may also be an input / output circuit, which can input information (or, receive information) and output information (or, transmit information), and the processor 2010 is an integrated processor, a microprocessor, an integrated circuit or a logic circuit, etc., and the processor can determine the output information according to the input information.

[0380] The coupling in this application is an indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 2010 may cooperate with the memory 2020 and the communication interface 2030. In this application, the specific connection medium between the above-mentioned processor 2010, memory 2020 and communication interface 2030 is not limited.

[0381] Optionally, as Figure 6 shown, the processor 2010, the memory 2020 and the communication interface 2030 are interconnected through a bus 2040. Optionally, the bus may include types of buses such as an address bus, a data bus, and a control bus. In addition, for the sake of representation, Figure 6 only one bus 2040 is shown, but it does not mean that there is only one bus or one type of bus.

[0382] It should be understood that the processor mentioned in the embodiments of the present application may be the following devices or a part of the circuit for processing functions in the following devices: a central processing unit (CPU), and may also be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0383] It should also be understood that the memory mentioned in the embodiments of the present application may be volatile memory and / or non-volatile memory. Among them, the non-volatile memory may be a read-only memory (ROM), a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), or a flash memory. The volatile memory may be a random access memory (RAM). For example, the RAM may be used as an external cache. By way of example and not limitation, the RAM includes the following various forms: static random access memory (SRAM), dynamic random access memory (DRAM), synchronous dynamic random access memory (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchlink DRAM (SLDRAM), and direct rambus RAM (DR RAM).

[0384] 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) may be integrated in the processor.

[0385] It should also be noted that the memories described herein are intended to include, but are not limited to, these and any other suitable types of memories.

[0386] In the embodiments of the present application, the method described in the above embodiments may be executed by the sending end and the receiving end, or may be executed by the chips, chip systems or circuits of the sending end and the receiving end. The chips, chip systems or circuits may be installed in the sending end and the receiving end.

[0387] According to the method provided by the embodiments of the present application, the present application also provides a computer program product, which includes: computer program code. When the computer program code runs on a computer, the computer is caused to execute the method in the above method embodiments.

[0388] According to the method provided by the embodiments of the present application, the present application also provides a computer-readable medium, which stores program code. When the program code runs on a computer, the computer is caused to execute the method in the above method embodiments.

[0389] According to the method provided by the embodiments of the present application, the present application also provides a system, which includes the aforementioned sending end and / or receiving end, that is, an AP and / or an STA.

[0390] Those of ordinary skill in the art can realize that the units and algorithm steps of the examples described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or by a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods to implement the described functions for each specific application, but such implementation should not be considered to exceed the scope of the present application.

[0391] Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the foregoing method embodiments, and will not be elaborated herein.

[0392] In several embodiments provided by 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 merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point, the displayed or discussed couplings or direct couplings or communication connections to each other may be through some interfaces. The indirect couplings or communication connections of the devices or units may be in an electrical, mechanical or other form.

[0393] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or may be distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0394] In addition, each functional unit in various embodiments of the present application can be integrated in a processing unit, can also exist physically separately for each unit, or two or more units can be integrated in one unit.

[0395] If the described function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical discs that can store program codes.

[0396] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of changes or substitutions, which should all be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claimed rights.

Claims

1. A communication method, characterized in that, Applied to the transmitter side, the method includes: Generating a Physical Layer Protocol Data Unit (PPDU), where the PPDU includes a first field for carrying part or all of a first sequence, and part or all of the first sequence is used by the receiver for channel estimation. The first sequence includes a first base sequence and a second base sequence, and the first base sequence and the second base sequence satisfy the relationship of alternating sign change and reverse order; Transmitting the PPDU.

2. The method according to claim 1, characterized in that, The first base sequence is located on the high-frequency side of the center frequency band of the bandwidth of the PPDU, and the second base sequence is located on the low-frequency side of the center frequency band of the bandwidth of the PPDU.

3. The method according to claim 1 or 2, characterized in that, The first base sequence s(i) and the second base sequence s A (i) satisfy the relationship of alternating negation and reverse order, including: s A s(i) = s(j - i)(-1) j-i , where i = 0, 1, 2, …, j; Where i represents the index of an element of the first base sequence or the second base sequence, and the first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

4. The method according to claim 1 or 2, characterized in that, The first base sequence s(i) and the second base sequence -s A (i) satisfy the relationship of alternating negation and reverse order, including: -s A (i) = -s(j - i)(-1) j-i , i = 0, 1, 2, …, j; Where i represents the index of an element of the first base sequence or the second base sequence, and the first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

5. The method according to any one of claims 1 to 4, characterized in that, The set of position indices of the subcarriers corresponding to the first sequence is {-28, -27, …, -1, 0, 1, …, 27, 28}, where the set of position indices of the subcarriers corresponding to the first base sequence is {1, …, 27, 28}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-28, -27, …, -1}; The first base sequence is {1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1}, the second base sequence is {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1}, and the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 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}; or, The first base sequence is {1, 1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1}, the second base sequence is {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1}, and the first sequence is: {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 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}; or, The first base sequence is: {1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1}, the second base sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1}, and the first sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 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}; or, The first base sequence is: {1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1}, the second base sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1}, and the first sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 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}; or, The first base sequence is: {1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1}, and the first sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 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}; or, The first base sequence is: {1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1}, the second base sequence is: {-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1}, and the first sequence is: {-1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, 1, 1, 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}; or, The first base sequence is: {-1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}, the second base sequence is: {-1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1}, and the first sequence is: {-1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 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}; or, The first base sequence is: {-1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1}, the second base sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1}, and the first sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 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}.

6. The method according to any one of claims 1 to 4, characterized in that, The set of position indices of the subcarriers corresponding to the first sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, where the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 57, 58}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-58, -57, …, -2}; The first base sequence is: {1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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}, and the first sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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, 1, 1, 1, -1}; or, The first base sequence is: {1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -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}; or, The first base sequence is: {1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -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}; or, The first base sequence is: {-1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 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}; or, The first base sequence is: {1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -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}, and the first sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -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, 1, 1, 1, -1}; or, The first base sequence is: {1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -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}; or, The first base sequence is: {1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -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}; or, The first base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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}, and the first sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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, -1, 1, -1, 1}.

7. The method according to any one of claims 1 to 4, characterized in that, The set of position indices of the subcarriers corresponding to the first sequence is {-122, -121, …, -1, 0, 1, …, 121, 122}, where the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 121, 122}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-122, -121, …, -2}; The first base sequence is: {1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -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, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1}, the second base sequence is: {1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -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, -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, -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, 1, 1, -1, 1, 1, -1, 1, 1}; or, The first base sequence is: {1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 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, 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, -1, -1, 1, -1, 1, -1, -1, 1, 1}; or, The first base sequence is: {1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -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, 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, -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, 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, 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, -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, -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, -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, -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, 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, 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, -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, 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, -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, 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, 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, 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, -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, 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, 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, -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, -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, -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, -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, -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}; or, The first base sequence is: {-1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -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, 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}, the second base sequence is: {1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 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, 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,-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,-1,1,1,-1,-1,-1,-1,-1,1,1,-1}; or, The first base sequence is: {1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 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, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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}, and the first sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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, 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, 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, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}; or, The first base sequence is: {1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -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, -1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -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, -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, -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, 1, -1, -1, -1, 1, -1, -1, -1, -1}; or, The first base sequence is: {1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 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, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 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}, and the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 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,-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,-1,-1,-1,-1,-1,-1,-1,1,1,-1}; or, The first base sequence is: {-1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 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, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 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, 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,-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,-1,1,-1,-1,1,-1,-1,-1,1,-1,1}。, 8. The method according to any one of claims 1 to 7, characterized in that, The interval of the subcarriers transmitting the PPDU is greater than or equal to 312.5 KHz.

9. A communication method, characterized in that, Applied to the receiving end, it includes: Receiving a physical layer protocol data unit PPDU, the PPDU includes a first field, and the first field carries part or all of the first sequence that has passed through the wireless channel; Performing channel estimation according to part or all of the first sequence that has passed through the wireless channel and a preset first sequence, the preset first sequence includes a first base sequence and a second base sequence, and the first base sequence and the second base sequence satisfy the relationship of alternating inversion and reverse order.

10. The method according to claim 9, characterized in that, The first base sequence is located on the high-frequency side of the center frequency band of the bandwidth of the PPDU, and the second base sequence is located on the low-frequency side of the center frequency band of the bandwidth of the PPDU.

11. The method according to claim 9 or 10, wherein the first base sequence s(i) and the second base sequence s A (i) satisfy the relationship of alternately taking the inverse and reversing the order, including: s A (i) = s(j - i)(-1) j-i , i = 0, 1, 2, …, j; Among them, i represents the index of an element of the first base sequence or the second base sequence. The first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

12. The method according to claim 9 or 10, characterized in that, The first base sequence s(i) and the second base sequence -s A (i) satisfy the relationship of alternating inversion and reverse order, including: -s A (i) = -s(j - i)(-1) j-i , i = 0, 1, 2, …, j; Among them, i represents the index of an element of the first base sequence or the second base sequence. The first base sequence or the second base sequence includes j + 1 elements, and i and j are integers greater than or equal to 0.

13. The method according to any one of claims 9 to 12, characterized in that, The set of position indices of the subcarriers corresponding to the first sequence is {-28, -27, …, -1, 0, 1, …, 27, 28}. Among them, the set of position indices of the subcarriers corresponding to the first base sequence is {1, …, 27, 28}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-28, -27, …, -1}; The first base sequence is {1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1}, the second base sequence is {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1}, and the first sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 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}; or, The first base sequence is {1, 1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1}, the second base sequence is {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1}, and the first sequence is: {1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, -1, -1, 1, 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}; or, The first base sequence is: {1, -1, 1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1}, the second base sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1}, and the first sequence is: {-1, -1, -1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, 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}; or, The first base sequence is: {1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1}, the second base sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1}, and the first sequence is: {1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, 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}; or, The first base sequence is: {1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1}, and the first sequence is: {1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 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}; or, The first base sequence is: {1, -1, -1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1}; or, The first base sequence is: {-1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1}; or, The first base sequence is: {-1, 1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1}; and the second base sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1}; and the first sequence is: {1, -1, -1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, 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}.

14. The method according to any one of claims 9 to 12, characterized in that, The set of position indices of the subcarriers corresponding to the first sequence is {-58, -57, …, -1, 0, 1, …, 57, 58}, where the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 57, 58}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-58, -57, …, -2}; The first base sequence is: {1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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}, and the first sequence is: {-1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -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, 1, 1, 1, -1}; or, The first base sequence is: {1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 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}; or, The first base sequence is: {1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1}; the second base sequence is: {-1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1}; the first sequence is: {-1, 1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -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, 1, -1, -1}; or, The first base sequence is: {-1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 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}; or, The first base sequence is: {1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1, 1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -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}, and the first sequence is: {-1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -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, 1, 1, 1, -1}; or, The first base sequence is: {1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, 1, -1, -1, -1, 1, -1, 1, -1, -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}; or, The first base sequence is: {1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, 1, 1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, 1, 1, 1, -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}; or, The first base sequence is: {-1, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1}; the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1}; the first sequence is: {-1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, -1, -1, 1, -1, -1, -1, -1, -1, 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, -1, 1, -1, 1}.

15. The method according to any one of claims 9 to 12, characterized in that, The set of position indices of the subcarriers corresponding to the first sequence is {-122, -121, …, -1, 0, 1, …, 121, 122}, where the set of position indices of the subcarriers corresponding to the first base sequence is {2, …, 121, 122}, and the set of position indices of the subcarriers corresponding to the second base sequence is {-122, -121, …, -2}; The first base sequence is: {1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -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, 1, -1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, -1, 1, 1}, the second base sequence is: {1, -1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -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, -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, -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, 1, 1, -1, 1, 1, -1, 1, 1}; or, The first base sequence is: {1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, -1, 1, 1, -1, -1, 1, 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, 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, -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, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1}; or, The first base sequence is: {1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -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, 1, 1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1}, the second base sequence is: {1, 1, -1, 1, 1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, 1, 1, 1, 1, -1, 1, 1, -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, -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, -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, 1, -1, -1, 1, 1, 1, -1, -1, -1, 1}; or, The first base sequence is: {-1, -1, 1, 1, -1, 1, -1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, 1, 1, 1, -1, -1, 1, 1, -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, 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}, the second base sequence is: {1, 1, -1, -1, 1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 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, 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,-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,-1,1,1,-1,-1,-1,-1,-1,1,1,-1}; or, The first base sequence is: {1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, 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, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -1, 1, 1, 1, 1, -1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}, the second base sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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}, the first sequence is: {-1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1, -1, 1, -1, 1, 1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -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, 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, 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, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1}; or, The first base sequence is: {1, 1, -1, -1, -1, 1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -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, -1, -1, 1, 1, 1, -1, 1, 1, 1, 1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, 1, 1, -1, -1, -1, 1, -1, -1, -1, -1}, the second base sequence is: {1, -1, 1, -1, -1, -1, 1, -1, -1, 1, -1, -1, 1, -1, 1, 1, 1, -1, -1, 1, -1, 1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 1, -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, -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, -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, 1, -1, -1, -1, 1, -1, -1, -1, -1}; or, The first base sequence is: {1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, 1, -1, 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, 1, -1, -1, 1, -1, 1, 1, -1, 1, 1, 1, 1, -1, 1, -1, -1, 1, 1, -1, -1, -1, -1, -1, -1, -1, -1, 1, 1, -1}, the second base sequence is: {-1, -1, 1, 1, -1, 1, -1, 1, -1, 1, -1, 1, 1, -1, -1, 1, 1, 1, 1, -1, 1, -1, -1, -1, 1, 1, 1, 1, -1, -1, -1, 1, -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, 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,-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,-1,-1,-1,-1,-1,-1,-1,1,1,-1}; or, The first base sequence is: {-1, 1, 1, -1, 1, 1, 1, -1, 1, -1, 1, -1, 1, 1, -1, 1, 1, -1, 1, -1, -1, 1, -1, -1, 1, -1, -1, -1, 1, -1, -1, 1, 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, -1, -1, 1, -1, 1}, the second base sequence is: {-1, -1, -1, -1, 1, -1, -1, -1, 1, 1, 1, -1, -1, -1, -1, 1, -1, -1, 1, 1, 1, 1, 1, 1, 1, -1, 1, 1, 1, -1, -1, 1, 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, 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,-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,-1,1,-1,-1,1,-1,-1,-1,1,-1,1}。, 16. The method according to any one of claims 9 to 15, characterized in that, The interval between the subcarriers transmitting the PPDU is greater than or equal to 312.5 KHz.

17. A communication device, characterized in that, It includes units or modules for performing the method according to any one of claims 1 to 8.

18. A communication device, characterized in that, It includes units or modules for performing the method according to any one of claims 9 to 16.

19. A communication device, characterized in that, It includes a processor, and the processor is configured to execute the computer program or instructions stored in the memory, so that the communication device performs the method according to any one of claims 1 to 8.

20. A communication device, characterized in that, It includes a processor, and the processor is configured to execute the computer program or instructions stored in the memory, so that the communication device performs the method according to any one of claims 9 to 16.

21. A computer-readable storage medium, characterized in that, A computer program or instructions are stored on the computer-readable storage medium. When the computer program or instructions run on the communication device, the communication device is caused to execute the method according to any one of claims 1 to 8, or execute the method according to any one of claims 9 to 16.

22. A computer program product, characterized in that, The computer program product includes a computer program or instructions for executing the method according to any one of claims 1 to 8, or includes a computer program or instructions for executing the method according to any one of claims 9 to 16.

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