Communication method and apparatus based on a physical layer protocol data unit

Abstract

A communication method and apparatus based on a PPDU are disclosed, which are used in a wireless local area network system supporting 802.11 series protocols such as the next-generation Wi-Fi protocol of IEEE 802.11ax, for example, 802.11be, Wi-Fi 7, or EHT, and the next-generation protocol of 802.11be, for example, Wi-Fi 8. The transmitting end generates a PPDU and transmits the PPDU on a first high-frequency channel. Correspondingly, the receiving end receives the PPDU on the first high-frequency channel and processes the PPDU. The first high-frequency channel may include a first pilot subcarrier and a first data subcarrier, the number of the first pilot subcarriers is more than the number of the second pilot subcarriers, and the number of the first data subcarriers is equal to the number of the second data subcarriers. This can effectively improve the accuracy of demodulation at the receiving end.

Description

Technical Field

[0001] This application claims priority to Chinese Patent Application No. 202210545847.2, filed with the China National Intellectual Property Administration on May 19, 2022, under the title of "Communication Method and Apparatus Based on Physical Layer Protocol Data Unit", which is incorporated herein by reference in its entirety.

[0002] This application relates to the field of communication technologies, and more specifically, to a communication method and apparatus based on a physical layer (PHY) protocol data unit (PPDU).

Background Art

[0003] Wireless local area networks (WLANs) have evolved from 802.11a / g to 802.11n, 802.11ac, 802.11ax, 802.11be, etc. In a WLAN, the available frequency bands used have expanded from 2.4 GHz to 2.4 GHz / 5 GHz and then to 2.4 GHz / 5 GHz / 6 GHz, and the supported bandwidth has expanded from 20 MHz to 320 MHz, so the spectral efficiency and throughput of WLANs have been continuously improved. In next-generation WLAN technologies, the 45 GHz / 60 GHz millimeter-wave band and other millimeter-wave bands are introduced to further enhance the physical layer capabilities of WLANs.

[0004] A method for transmitting high-frequency band signals can be shown as follows. The high-frequency band signal obtained by widening the sub-carrier interval of the low-frequency band signal is directly transmitted. Specifically, in order to ensure that the process of processing the digital signal of the high-frequency band signal is almost the same as the process of processing the digital signal of the low-frequency band signal, the number of pilot sub-carriers used for the high-frequency band signal is equal to the number of pilot sub-carriers used for the low-frequency band signal, the positions of the pilot sub-carriers used for the high-frequency band signal correspond to the positions of the pilot sub-carriers used for the low-frequency band signal, the number of guard sub-carriers used for the high-frequency band signal is equal to the number of guard sub-carriers used for the low-frequency band signal, and the positions of the guard sub-carriers used for the high-frequency band signal correspond to the positions of the guard sub-carriers used for the low-frequency band signal. This is convenient for the design and implementation of chips for next-generation WLAN protocols that support both high-frequency and low-frequency bands. The low-frequency band signal can be understood as a signal in protocols for low-frequency bands such as 802.11n, 802.11ac, 802.11ax, and 802.11be.

[0005] In the above method, it is necessary to improve the accuracy of demodulation at the receiving end.

Summary of the Invention

Means for Solving the Problems

[0006] This application provides a PPDU-based communication method and apparatus for effectively improving the accuracy of demodulation at the receiving end.

[0007] According to a first aspect, an embodiment of the present application provides a communication method based on a Physical Layer Protocol Data Unit (PPDU). The method is applied to a transmitting end or a chip, the chip is used at the transmitting end, and the method includes the steps of generating a PPDU and transmitting the PPDU on a first high-frequency channel, where the first high-frequency channel includes a first pilot subcarrier and a first data subcarrier, the Discrete Fourier Transform (DFT) size corresponding to the first high-frequency channel is the same as the DFT size corresponding to a first low-frequency channel, the number of the first pilot subcarriers is greater than the number of second pilot subcarriers in the first low-frequency channel, and the number of the first data subcarriers is equal to the number of second data subcarriers in the first low-frequency channel.

[0008] According to a second aspect, an embodiment of the present application provides a communication method based on a Physical Layer Protocol Data Unit (PPDU). The method is applied to a receiving end or a chip, the chip is used at the receiving end, and the method includes the step of receiving a PPDU on a first high-frequency channel, where the first high-frequency channel includes a first pilot subcarrier and a first data subcarrier, the Discrete Fourier Transform (DFT) size corresponding to the first high-frequency channel is the same as the DFT size corresponding to a first low-frequency channel, the number of the first pilot subcarriers is greater than the number of second pilot subcarriers in the first low-frequency channel, and the number of the first data subcarriers is equal to the number of second data subcarriers in the first low-frequency channel, and the step of processing the PPDU.

[0009] In this embodiment of the present application, since it is guaranteed that the number of first pilot subcarriers is greater than the number of second pilot subcarriers, the receiving end has a sufficient amount of pilots to correct the frequency offset, thereby improving the accuracy of data demodulation by the receiving end. Since it is guaranteed that the number of first data subcarriers is equal to the number of second data subcarriers, the process of generating a PPDU by the transmitting end may also be substantially the same, thereby guaranteeing the compatibility of the baseband chips in the low-frequency band and the high-frequency band. In the strategy of directly expanding the subcarrier interval of the low-frequency band signal to obtain the high-frequency band signal while keeping the number of pilots unchanged, since the interference of the high-frequency band signal is greater than the interference of the low-frequency band signal, when the number of pilots does not change, the receiving end may not have a sufficient amount of pilots to correct the frequency offset. As a result, the phase offset estimation at the receiving end may be inaccurate, and the phase offset related to the data subcarriers cannot be accurately compensated. This affects the accuracy of demodulation.

[0010] Regarding the second aspect, in a possible implementation, the step of processing the PPDU includes obtaining a pilot signal in the PPDU on the first pilot subcarrier corresponding to the index value based on the index value of the first pilot subcarrier, and performing processing based on the pilot signal.

[0011] Regarding the second aspect, in a possible implementation, the step of performing processing based on the pilot signal includes at least one of performing phase offset estimation and / or compensation based on the pilot signal, and performing frequency offset estimation and / or compensation based on the pilot signal.

[0012] Regarding the first and second aspects, in one possible implementation, the first pilot subcarrier is obtained by mapping the second pilot subcarrier and the second guard subcarrier within the first low-frequency channel to the first high-frequency channel.

[0013] In this embodiment of the present application, the first pilot subcarrier is obtained by using the second pilot subcarrier and the second guard subcarrier. The change is small compared to that in the protocol for the low-frequency band.

[0014] Regarding the first and second aspects, in one possible implementation, the index value of the first pilot subcarrier includes at least one of the index value of the second guard subcarrier and the index value of the second pilot subcarrier.

[0015] Regarding the first and second aspects, in one possible implementation, the index value of the first pilot subcarrier is [-29, -21, -7, 7, 21], [-29, -21, -7, 7, 21, 29], [-30, -29, -21, -7, 7, 21, 29], [-30, -29, -21, -7, 7, 21, 29, 30], [-31, -30, -29, -21, -7, 7, 21, 29, 30], [-31, -30, -29, -21, -7, 7, 21, 29, 30, 31], and includes at least one of [-32, -31, -30, -29, -21, -7, 7, 21, 29, 30, 31], [-21, -7, 7, 21] is the same as the index value of the second pilot subcarrier, and [-32, -31, -30, -29, 29, 30, 31] is the same as the index value of the second guard subcarrier.

[0016] Regarding the first aspect and the second aspect, in a possible implementation form, the index value of the first pilot subcarrier is [-59, -53, -25, -11, 11, 25, 53], [-59, -53, -25, -11, 11, 25, 53, 59], [-60, -59, -53, -25, -11, 11, 25, 53, 59], [-60, -59, -53, -25, -11, 11, 25, 53, 59, 60], [-61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60], [-61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61], [-62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61], [-62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62], [-63, -62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62], [-63, -62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62, 63], and includes at least one of [-64, -63, -62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62, 63], [-53, -25, -11, 11, 25, 53] is the same as the index value of the second pilot subcarrier, and [-64, -63, -62, -61, -60, -59, 59, 60, 61, 62, 63] is the same as the index value of the second guard subcarrier.

[0017] Regarding the first aspect and the second aspect, in a possible implementation, the index value of the first pilot subcarrier is [-123, -103, -75, -39, -11, 11, 39, 75, 103], [-123, -103, -75, -39, -11, 11, 39, 75, 103, 123], [-124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123], [-124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124], [-125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124], [-125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125], [-126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125], [-126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126], [-127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126], [-127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126, 127], and includes at least one of [-128, -127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126, 127], [-103, -75, -39, -11, 11, 39, 75, 103] is the same as the index value of the second pilot sub-carrier, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] is the same as the index value of the second guard sub-carrier.

[0018] Regarding the first aspect and the second aspect, in a possible implementation, the index value of the first pilot sub-carrier is [-123, -116, -90, -48, -22, 22, 48, 90, 116], [-123, -116, -90, -48, -22, 22, 48, 90, 116, 123], [-124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123], [-124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124], [-125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124], [-125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125], [-126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125], [-126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126], [-127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126], [-127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126, 127], and includes at least one of [-128, -127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126, 127], [-116, -90, -45, -22, 22, 48, 90, 116] is the same as the index value of the second pilot subcarrier, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] is the same as the index value of the second guard subcarrier.

[0019] Regarding the first aspect and the second aspect, in a possible implementation, the index value of the first pilot subcarrier is [-245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245], [-246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246], [-247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247]、 [-248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248]、 [-249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249]、 [-250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250]、 [-251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251]、 [-252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252]、 [-253, -252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252, 253], [-254, -253, -252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254], and includes at least one of [-255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255], [-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238] is the same as the index value of the second pilot subcarrier, and [-256, -255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255] is the same as the index value of the second guard subcarrier.

[0020] Regarding the first and second aspects, in one possible implementation, the index value of the first pilot subcarrier is [-501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501]、 [-502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502]、 [-503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503]、 [-504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504]、 [-505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505]、 [-506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506]、 [-507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507]、 [-508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508], [-509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509], [-510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510], and [-511, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511] includes at least one of, [-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468] is the same as the index value of the second pilot sub-carrier, and [-512, -511, -510, -519, -518, -517, -516, -515, -514, -513, -512, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511] is the same as the index value of the second guard sub-carrier.

[0021] Regarding the first aspect and the second aspect, in a possible implementation, the index value of the first pilot sub-carrier is [-501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501], [-502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502], [-503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503], [-504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504], [-505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505]、 [-506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506]、 [-507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507]、 [-508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508]、 [-509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509]、 [-510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510], and includes at least one of [-511, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511], [-468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468] is the same as the index value of the second pilot subcarrier, and [-512, -511, -510, -519, -518, -517, -516, -515, -514, -513, -512, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511] is the same as the index value of the second guard subcarrier.

[0022] Regarding the first and second aspects, in one possible implementation, the first pilot subcarrier is obtained by mapping the second data subcarrier in the first low-frequency channel to the first high-frequency channel, or the first pilot subcarrier is obtained by mapping the second pilot subcarrier and the second data subcarrier to the first high-frequency channel.

[0023] In this embodiment of the present application, since the first pilot subcarrier is obtained by using the second data subcarrier and the second pilot subcarrier (or zero second pilot subcarriers), the first pilot subcarrier can be placed further away from the filter, resulting in higher safety.

[0024] Regarding the first aspect and the second aspect, in a possible implementation, the index value of the first pilot subcarrier is [-25, -15, -5, 5, 15], [-25, -15, -5, 5, 15, 25], [-28, -20, -12, -4, 4, 12, 20], [-28, -20, -12, -4, 4, 12, 20, 28], [-27, -21, -15, -9, -3, 3, 9, 15, 21], [-27, -21, -15, -9, -3, 3, 9, 15, 21, 27], and [-28, -23, -18, -13, -8, -3, 3, 8, 13, 18, 23] includes at least one of them, or The index value of the first pilot subcarrier is [-49, -35, -21, -7, 7, 21, 35], [-49, -35, -21, -7, 7, 21, 35, 49], [-54, -42, -30, -18, -6, 6 18, 30, 42], [-54, -42, -30, -18, -6, 6 18, 30, 42, 54], [-55, -45, -35, -25, -15, -5, 5, 15, 25, 35, 45], [-55, -45, -35, -25, -15, -5, 5, 15, 25, 35, 45, 55], [-52, -44, -36, -28, -20, -12, -4, 4, 12, 20, 28, 36, 44]、 [-52, -44, -36, -28, -20, -12, -4, 4, 12, 20, 28, 36, 44, 52]、 [-53, -46, -39, -32, -25, -18, -11, -4, 4, 11, 18, 25, 32, 39, 46]、 [-53, -46, -39, -32, -25, -18, -11, -4, 4, 11, 18, 25, 32, 39, 46, 53], and includes at least one of [-58, -52, -46, -40, -34, -28, -22, -16, -10, -4, 4, 10, 16, 22, 28, 34, 40, 46, 52], or The index value of the first pilot subcarrier is [-108, -84, -60, -36, -12, 12, 36, 60, 84]、 [-108, -84, -60, -36, -12, 12, 36, 60, 84, 108]、 [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90]、 [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110]、 [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99]、 [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117]、 [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98]、 [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113], [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98], [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 113], and includes at least one of [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102], or The index value of the first pilot subcarrier is [-108, -84, -60, -36, -12, 12, 36, 60, 84], [-108, -84, -60, -36, -12, 12, 36, 60, 84, 108], [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90], [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110], [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99], [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117], [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98], [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113], [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98]、 [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 113]、and includes at least one of [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102], or The index value of the first pilot subcarrier is [-229, -202, -175, -148, -121, -94, -67, -40, -13, 13, 40, 67, 94, 121, 148, 175, 202, 229]、 [-228, -204, -180, -156, -132, -108, -84, -60, -36, -12, 12, 36, 60, 84, 108, 132, 156, 180, 204, 228]、 [-231, -209, -187, -165, -143, -121, -99, -77, -55, -33, -11, 11, 33, 55, 77, 99, 121, 143, 165, 187, 209, 231]、 [-230, -210, -190, -170, -150, -130, -110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110, 130, 150, 170, 190, 210, 230]、 [-225, -207, -189, -171, -153, -135, -117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117, 135, 153, 171, 189, 207, 225]、 [-230, -213, -196, -179, -162, -145, -128, -111, -94, -77, -60, -43, -26, -9, 9, 26, 43, 60, 77, 94, 111, 128, 145, 162, 179, 196, 213, 230], [-232, -216, -200, -184, -168, -152, -136, -120, -104, -88, -72, -56, -40, -24, -8, 8, 24, 40, 56, 72, 88, 104, 120, 136, 152, 168, 184, 200, 216, 232], [-233, -218, -203, -188, -173, -158, -143, -128, -113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113, 128, 143, 158, 173, 188, 203, 218, 233], [-231, -217, -203, -189, -175, -161, -147, -133, -119, -105, -91, -77, -63, -49, -35, -21, -7, 7, 21, 35, 49, 63, 77, 91, 105, 119, 133, 147, 161, 175, 189, 203, 217, 231], [-228, -215, -202, -189, -176, -163, -150, -137, -124, -111, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 111, 124, 137, 150, 163, 176, 189, 202, 215, 228], and including at least one of [-222, -210, -198, -186, -174, -162, -150, -138, -126, -114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102, 114, 126, 138, 150, 162, 174, 186, 198, 210, 222], or The index value of the first pilot subcarrier is [-476, -420, -364, -308, -252, -196, -140, -84, -28, 28, 84, 140, 196, 252, 308, 364, 420, 476], [-475, -425, -375, -325, -275, -225, -175, -125, -75, -25, 25, 75, 125, 175, 225, 275, 325, 375, 425, 475], [-462, -418, -374, -330, -286, -242, -198, -154, -110, -66, -22, 22, 66, 110, 154, 198, 242, 286, 330, 374, 418, 462], [-483, -441, -399, -357, -315, -273, -231, -189, -147, -105, -63, -21, 21, 63, 105, 147, 189, 231, 273, 315, 357, 399, 441, 483], [-475, -437, -399, -361, -323, -285, -247, -209, -171, -133, -95, -57, -19, 19, 57, 95, 133, 171, 209, 247, 285, 323, 361, 399, 437, 475], [-486, -450, -414, -378, -342, -306, -270, -234, -198, -162, -126, -90, -54, -18, 18, 54, 90, 126, 162, 198, 234, 270, 306, 342, 378, 414, 450, 486], [-478, -445, -412, -379, -346, -313, -280, -247, -214, -181, -148, -115, -82, -49, -16, 16, 49, 82, 115, 148, 181, 214, 247, 280, 313, 346, 379, 412, 445, 478], [-480, -449, -418, -387, -356, -325, -294, -263, -232, -201, -170, -139, -108, -77, -46, -15, 15, 46, 77, 108, 139, 170, 201, 232, 263, 294, 325, 356, 387, 418, 449, 480], [-495, -465, -435, -405, -375, -345, -315, -285, -255, -225, -195, -165, -135, -105, -75, -45, -15, 15, 45, 75, 105, 135, 165, 195, 225, 255, 285, 315, 345, 375, 405, 435, 465, 495], [-490, -462, -434, -406, -378, -350, -322, -294, -266, -238, -210, -182, -154, -126, -98, -70, -42, -14, 14, 42, 70, 98, 126, 154, 182, 210, 238, 266, 294, 322, 350, 378, 406, 434, 462, 490], and including at least one of [-481, -455, -429, -403, -377, -351, -325, -299, -273, -247, -221, -195, -169, -143, -117, -91, -65, -39, -13, 13, 39, 65, 91, 117, 143, 169, 195, 221, 247, 273, 299, 325, 351, 377, 403, 429, 455, 481], or the index value of the first pilot subcarrier is [-476, -420, -364, -308, -252, -196, -140, -84, -28, 28, 84, 140, 196, 252, 308, 364, 420, 476], [-475, -425, -375, -325, -275, -225, -175, -125, -75, -25, 25, 75, 125, 175, 225, 275, 325, 375, 425, 475], [-462, -418, -374, -330, -286, -242, -198, -154, -110, -66, -22, 22, 66, 110, 154, 198, 242, 286, 330, 374, 418, 462], [-483, -441, -399, -357, -315, -273, -231, -189, -147, -105, -63, -21, 21, 63, 105, 147, 189, 231, 273, 315, 357, 399, 441, 483], [-475, -437, -399, -361, -323, -285, -247, -209, -171, -133, -95, -57, -19, 19, 57, 95, 133, 171, 209, 247, 285, 323, 361, 399, 437, 475], [-486, -450, -414, -378, -342, -306, -270, -234, -198, -162, -126, -90, -54, -18, 18, 54, 90, 126, 162, 198, 234, 270, 306, 342, 378, 414, 450, 486], [-478, -445, -412, -379, -346, -313, -280, -247, -214, -181, -148, -115, -82, -49, -16, 16, 49, 82, 115, 148, 181, 214, 247, 280, 313, 346, 379, 412, 445, 478], [-480, -449, -418, -387, -356, -325, -294, -263, -232, -201, -170, -139, -108, -77, -46, -15, 15, 46, 77, 108, 139, 170, 201, 232, 263, 294, 325, 356, 387, 418, 449, 480], [-495, -465, -435, -405, -375, -345, -315, -285, -255, -225, -195, -165, -135, -105, -75, -45, -15, 15, 45, 75, 105, 135, 165, 195, 225, 255, 285, 315, 345, 375, 405, 435, 465, 495], [-490, -462, -434, -406, -378, -350, -322, -294, -266, -238, -210, -182, -154, -126, -98, -70, -42, -14, 14, 42, 70, 98, 126, 154, 182, 210, 238, 266, 294, 322, 350, 378, 406, 434, 462, 490], and It includes at least one of [-481, -455, -429, -403, -377, -351, -325, -299, -273, -247, -221, -195, -169, -143, -117, -91, -65, -39, -13, 13, 39, 65, 91, 117, 143, 169, 195, 221, 247, 273, 299, 325, 351, 377, 403, 429, 455, 481].

[0025] Regarding the first aspect and the second aspect, in a possible implementation, the bandwidth of the first low - frequency channel includes at least one of 20MHz, 40MHz, and 80MHz, and the bandwidth of the first high - frequency channel includes at least one of 270MHz, 320MHz, 540MHz, 1080MHz, 2160MHz, 4320MHz, and 8640MHz.

[0026] According to the third aspect, an embodiment of the present application provides a communication device configured to implement the method in any one of the first aspect or a possible implementation of the first aspect. The communication device includes a unit for implementing the method in any one of the first aspect or a possible implementation of the first aspect.

[0027] According to the fourth aspect, an embodiment of the present application provides a communication device configured to implement the method in any one of the second aspect or a possible implementation of the second aspect. The communication device includes a unit for implementing the method in any one of the second aspect or a possible implementation of the second aspect.

[0028] For example, in the third aspect or the fourth aspect, the communication device may include a transceiver unit and a processing unit. For a specific description of the transceiver unit and the processing unit, please refer to the device embodiments given below.

[0029] In another example, in the third aspect, the communication device may include a generation unit and a transmission unit, and in the fourth aspect, the communication device may include a reception unit and a processing unit. For specific descriptions of the units, please refer to the embodiments of the device provided below.

[0030] According to a fifth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor configured to implement the method in any one of the first aspect or possible implementation forms of the first aspect. Alternatively, the processor is configured to execute a program stored in a memory. When the program is executed, the method in any one of the first aspect or possible implementation forms of the first aspect is implemented.

[0031] In a possible implementation form, the memory is located outside the communication device.

[0032] In a possible implementation form, the memory is located inside the communication device.

[0033] In this embodiment of the present application, the processor and the memory may alternatively be integrated into one device. In other words, the processor and the memory may alternatively be integrated together.

[0034] In a possible implementation form, the communication device further includes a transceiver. The transceiver is configured to receive and / or transmit signals. For example, the transceiver may be configured to transmit a PPDU or the like.

[0035] According to a sixth aspect, an embodiment of the present application provides a communication device. The communication device includes a processor configured to implement the method in any one of the second aspect or possible implementation forms of the second aspect. Alternatively, the processor is configured to execute a program stored in a memory. When the program is executed, the method in any one of the second aspect or possible implementation forms of the second aspect is implemented.

[0036] In one possible implementation, the memory is located outside the communication device.

[0037] In one possible implementation, the memory is located inside the communication device.

[0038] In this embodiment of the present application, the processor and the memory may alternatively be integrated into one device. In other words, the processor and the memory may alternatively be integrated together.

[0039] In one possible implementation, the communication device further includes a transceiver. The transceiver is configured to receive and / or transmit signals. For example, the transceiver may be configured to receive a PPDU.

[0040] According to a seventh aspect, an embodiment of the present application provides a communication device. The communication device includes a logic circuit and an interface. The logic circuit is coupled to the interface. The logic circuit is configured to generate a PPDU. The interface is configured to output the PPDU.

[0041] Optionally, the communication device further includes a memory, and the memory is configured to store at least one of a first sequence, a second sequence, a third sequence, a fourth sequence, and a fifth sequence.

[0042] Optionally, the communication device further includes a memory, and the memory is configured to store at least one of a sequence carried in a first STF or a sequence carried in a first LTF.

[0043] According to an eighth aspect, an embodiment of the present application provides a communication device. The communication device includes a logic circuit and an interface. The logic circuit is coupled to the interface. The interface is configured to input a PPDU. The logic circuit is configured to process the PPDU.

[0044] According to a ninth aspect, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium is configured to store a computer program, and when the computer program is executed on a computer, the method according to any one of the first aspect or possible implementation forms of the first aspect is implemented.

[0045] According to a tenth aspect, an embodiment of the present application provides a computer-readable storage medium. The computer-readable storage medium is configured to store a computer program, and when the computer program is executed on a computer, the method according to any one of the second aspect or possible implementation forms of the second aspect is implemented.

[0046] According to an eleventh aspect, an embodiment of the present application provides a computer program product. The computer program product includes a computer program or computer code (which may also be referred to as instructions), and when the computer program or computer code is executed on a computer, the method according to any one of the first aspect or possible implementation forms of the first aspect is implemented.

[0047] According to a twelfth aspect, an embodiment of the present application provides a computer program product. The computer program product includes a computer program or computer code (which may also be referred to as instructions), and when the computer program or computer code is executed on a computer, the method according to any one of the second aspect or possible implementation forms of the second aspect is implemented.

[0048] According to a thirteenth aspect, an embodiment of the present application provides a computer program. When the computer program is executed on a computer, the method according to any one of the first aspect or possible implementation forms of the first aspect is implemented.

[0049] According to the 14th aspect, an embodiment of the present application provides a computer program. When the computer program is executed on a computer, the method in any one of the 2nd aspect or the possible implementation forms of the 2nd aspect is implemented.

[0050] According to the 15th aspect, an embodiment of the present application provides a wireless communication system. The wireless communication system includes a transmitting end and a receiving end. The transmitting end is configured to implement the method in any one of the 1st aspect or the possible implementation forms of the 1st aspect. The receiving end is configured to implement the method in any one of the 2nd aspect or the possible implementation forms of the 2nd aspect.

Brief Description of the Drawings

[0051]

Figure 1

Figure 2

Figure 3a

Figure 3b

Figure 4

Figure 5

Figure 6

Figure 7

Embodiments for Carrying Out the Invention

[0052] To make the objectives, technical solutions, and advantages of the present application clearer, the present application will be further described with reference to the accompanying drawings.

[0053] In the description, claims, and accompanying drawings of this application, terms such as "first" and "second" are used only for distinguishing different objects and not for describing a specific order. In addition, terms such as "including", "having", and any other variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the enumerated steps or units, and optionally further includes other unenumerated steps or units, or optionally further includes other specific steps or units of the process, method, product, or device.

[0054] As used herein, "embodiment" means that the specific features, structures, or characteristics described in combination with the embodiment can be included in at least one embodiment of this application. The phrases shown at various positions in this specification may not necessarily mean the same embodiment, and are not exclusive, independent, or alternative embodiments with respect to other embodiments. It can be clearly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0055] In this application, "at least one (item)" means one or more, "a plurality of" means two or more, "at least two (items)" means two, three, or more, and "and / or" is used to describe the associative relationship between related objects, indicating that three relationships may exist. For example, "A and / or B" may illustrate three cases: only A exists, only B exists, and both A and B exist, and A and B may be in singular or plural form. The character " / " usually indicates an "or" relationship between related objects. "At least one of the following items (1)" or similar expressions mean any combination of these items. For example, at least one of the items (1) a, b, or c may indicate a, b, c, a and b, a and c, b and c, or a, b, and c.

[0056] The technical solutions provided in this application can be applied to a wireless local area network (WLAN) system, such as Wi-Fi. The methods provided in this application are applicable to the IEEE 802.11 series protocols, such as the 802.11a / b / g protocols, 802.11n protocol, 802.11ac protocol, 802.11ax protocol, 802.11be protocol, or next-generation protocols. Here, the examples are not listed one by one. The technical solutions provided in this application can further be applied to a wireless personal area network (WPAN) based on UWB technology. The methods provided in this application are applicable to the IEEE 802.15 series protocols, such as the 802.15.4a protocol, 802.15.4z protocol, 802.15.4ab protocol, or future-generation UWB WPAN protocols. Here, the examples are not listed one by one. The technical solutions provided in this application can further be applied to other communication systems, such as the internet of things (IoT) system, vehicle to X (V2X) system, and narrow band internet of things (NB-IoT) system, and may be applied to devices in the vehicle internet, internet of things (IoT) nodes in the internet of things, sensors, etc., smart cameras, smart remote controls, and smart water meters or electricity meters in a smart home, sensors in a smart city, etc., or may further be applied to a long term evolution (LTE) system, 5th-generation (5G) communication system, new communication systems emerging in the future development of communication (such as 6G), etc.

[0057] Embodiments of the present application are mainly described by way of example using WLAN, and in particular, the network used in the IEEE 802.11 series of standards is used as an example for illustration. Those skilled in the art can easily understand that various aspects of the present application can be extended to other networks using various standards or protocols, such as Bluetooth (registered trademark), high-performance radio LAN (HIPERLAN) (a wireless standard similar to the IEEE 802.11 standard mainly used in Europe), and wide area networks (WANs) or other networks that are known or will be developed in the future. Therefore, regardless of the coverage used and the wireless access protocol used, the various aspects provided in the present application are applicable to any suitable wireless network.

[0058] The method provided in the present application can be implemented by a communication device in a wireless communication system. For example, the communication device can be an access point (AP) or a station (STA).

[0059] An access point is a device with a wireless communication function, which supports communication or detection by using the WLAN protocol and has the function of communicating with or detecting another device (such as a station or another access point) in the WLAN network. Naturally, the access point may further have the function of communicating with or detecting another device. Alternatively, the access point is equivalent to a bridge that connects a wired network and a wireless network. The main function of the access point is to connect various wireless network clients together and then connect the wireless network to Ethernet. In a WLAN system, the access point may be called an access point station (AP STA). The device with the wireless communication function may be the entire device, or may be a chip, a processing system, etc. installed in the entire device. The device in which the chip or the processing system is installed may implement the methods and functions in the embodiments of the present application under the control of the chip or the processing system. The AP in the embodiments of the present application is a device that provides services to the STA and may support the 802.11 series protocols, subsequent protocols, etc. For example, the access point may be an access point for a terminal (such as a mobile phone) to access a wired (or wireless) network, and is mainly deployed in houses, buildings, and parks. The typical coverage radius is from dozens of meters to more than 100 meters. Naturally, the access point may alternatively be deployed outdoors. As another example, the AP may be a communication entity, such as a communication server, a router, a switch, or a bridge, or the AP may include various forms of macro base stations, micro base stations, relay stations, etc. It is obvious that the AP may alternatively be a chip or a processing system in various forms of these devices for realizing the methods and functions in the embodiments of the present application. The access point in the present application may be a HE AP or an EHT AP, or may be an access point applicable to future Wi-Fi standards, etc.

[0060] A station is a device with a wireless communication function, which supports communication or detection by using the WLAN protocol and has the ability to communicate with or detect another station or access point in the WLAN network. In a WLAN system, a station can be called a non-access point station (non-AP STA). For example, an STA is any user communication device that enables a user to communicate with or detect an AP and further communicate with the WLAN. The device with a wireless communication function may be the entire device, or may be a chip, a processing system, etc. installed in the entire device. The device in which the chip or processing system is installed may implement the methods and functions in the embodiments of the present application under the control of the chip or processing system. For example, a station may be a wireless communication chip, a wireless sensor, or a wireless communication terminal, and may also be called a user. In another example, a station may be a mobile phone, a tablet computer, a set-top box, a smart television, a smart wearable device, an in-vehicle communication device, or a computer that supports Wi-Fi communication function.

[0061] The WLAN system can achieve high-speed and low-latency transmission. With the continuous development of the applicable scenarios of WLAN, the WLAN system will be applied to more scenarios or industries, such as the Internet of Things industry, the Internet of Vehicles industry, banking, corporate offices, exhibition halls in stadiums, concert halls, hotel rooms, dormitories, hospital wards, classrooms, supermarkets, squares, streets, workplaces, and warehouses. Naturally, devices that assist WLAN communication or detection (such as access points or stations) can be sensor nodes in smart cities (such as smart water meters, smart electricity meters, or smart air quality detection nodes), smart devices in smart homes (such as smart cameras, projectors, displays, televisions, stereos, refrigerators, or washing machines), nodes in the Internet of Things, entertainment terminals in smart offices (such as AR, VR, or other wearable devices), smart devices (such as printers, projectors, loudspeakers, or stereos), Internet of Vehicles devices in the Internet of Vehicles, infrastructure in daily life scenarios (such as vending machines, self-service guidance machines in supermarkets, self-service cashiers, or self-service ordering machines), devices in large sports and music venues, etc. For example, each of the access point and the station may be a device used in the Internet of Vehicles, an Internet of Things node in the Internet of Things, a sensor, etc., a smart camera in a smart home, a smart remote control, and a smart water meter or electricity meter, a sensor in a smart city, etc. The specific forms of the STA and the AP are not limited in the embodiments of this application and are only examples for the description in this specification.

[0062] For example, a communication system to which the method provided in the embodiments of the present application can be applied may include an access point and a station. For example, the present application is applicable to a scenario where an AP communicates with or detects an STA in a WLAN. Optionally, the AP may communicate with or detect a single STA, or the AP may communicate with or detect multiple STAs simultaneously. Specifically, the communication or detection between the AP and multiple STAs can be further classified into a downlink transmission in which the AP transmits signals to multiple STAs simultaneously, and an uplink transmission in which multiple STAs transmit signals to the AP. A WLAN communication protocol between the AP and the STA can be supported. The communication protocol may include the IEEE 802.11 series protocols. For example, it is applicable to the 802.11be standard, and naturally also applicable to standards after 802.11be.

[0063] FIG. 1 is a diagram of the architecture of a communication system according to an embodiment of the present application. The communication system may include one or more APs and one or more STAs. FIG. 1 shows two access points, AP1 and AP2, and three stations, STA1, STA2, and STA3. It can be understood that one or more APs can communicate with one or more STAs. Of course, an AP may communicate with an AP, and an STA may communicate with an STA.

[0064] In FIG. 1, an example where the STA is a mobile phone and the AP is a router is used, which can be understood not to mean a limitation on the types of APs and STAs in the present application. In addition, FIG. 1 shows only two APs and three STAs as examples. However, there may be more or fewer APs or STAs. This is not limited in the present application.

[0065] For simplicity of description, the method provided in the embodiments of the present application will be described below by using a transmitter and a receiver as examples. The transmitter may include an AP, and the receiver may include a STA. Or, the transmitter includes a STA, and the receiver includes an AP. Or, both the transmitter and the receiver are APs. Or, both the transmitter and the receiver are STAs.

[0066] The symbols shown below may be called OFDM symbols, and it can be understood that the description of the OFDM symbols can be shown as follows.

[0067] Orthogonal frequency division multiplexing is a multi-carrier transmission technology. This technology may use a large number of adjacent orthogonal sub-carriers, and each sub-carrier can be modulated by using a modulation technique. Therefore, the orthogonal frequency division multiplexing technology can have a high-speed transmission capacity and can effectively withstand frequency selective fading. In the WLAN communication protocol, each OFDM symbol may include pilot sub-carriers, data sub-carriers, guard sub-carriers, and a direct current sub-carrier. The guard sub-carriers and the direct current sub-carrier may not carry signals. It is also possible to consider that the signal values carried on the guard sub-carriers and the direct current sub-carrier are 0. The pilot sub-carriers are sub-carriers for carrying pilots in the OFDM symbol, and the data sub-carriers are sub-carriers for placing or carrying data. The data sub-carriers may also be considered to be used for carrying payload information. The pilot sub-carriers are used for carrying pilot signals, and the values of the pilot signals are usually 1 or -1. In a communication system, the pilot sub-carriers may be used to assist in detecting and correcting sub-carrier phase offsets (or may be used to estimate residual frequency offsets and phase noise), thereby improving the accuracy of the analysis of the data sub-carriers. Based on the function of the pilot sub-carriers, the number of pilot sub-carriers affects the accuracy of correcting frequency offsets or phase offsets by the receiving end, and may further affect the bit error rate of the received signal or the required received signal-to-noise ratio of the receiving end.

[0068] It can be understood that the description of the OFDM symbol is applicable to all embodiments shown below.

[0069] With the development of WLAN protocols (e.g., 802.11 series protocols), the WLAN protocols support a larger bandwidth (e.g., from 20 MHz to 320 MHz) and more frequency bands, so the spectral efficiency and throughput are continuously improved. The 802.11 series protocols may include protocols for low-frequency bands and protocols for high-frequency bands. For example, the protocols for low-frequency bands may include 802.11, 802.11b, 802.11a, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be, etc. Details are not listed one by one here. For example, the protocols for high-frequency bands may include 802.11aj, 802.11ay, etc. Details are not listed one by one here. Different protocols may have different PPDU structures. For details, please refer to the relevant standards or protocols. Details are not shown one by one in this application.

[0070] In some embodiments, the baseband chip may be designed separately for high-frequency band signals and low-frequency band signals. In some other embodiments, an integrated baseband chip may be designed for high-frequency band signals and low-frequency band signals. However, the above two methods have high costs for chip design, development, debugging, etc. Therefore, in some further embodiments, Method A is provided as follows. The high-frequency band signal obtained by expanding the sub-carrier interval of the low-frequency band signal is directly transmitted. Specifically, the number of pilot sub-carriers used for the high-frequency band signal is equal to the number of pilot sub-carriers used for the low-frequency band signal, there is a mapping relationship between the positions of the pilot sub-carriers used for the high-frequency band signal and the positions of the pilot sub-carriers used for the low-frequency band signal, the number of guard sub-carriers used for the high-frequency band signal is equal to the number of guard sub-carriers used for the low-frequency band signal, and there is a mapping relationship between the positions of the guard sub-carriers used for the high-frequency band signal and the positions of the guard sub-carriers used for the low-frequency band signal. Therefore, the method of transmitting the high-frequency band signal is closer to the method of transmitting the low-frequency band signal. This reduces the complexity of designing a baseband chip that is compatible with high and low frequencies.

[0071] However, in the above-mentioned Method A, the high-frequency band signal obtained by widening the sub-carrier interval of the signal in the protocol for the low-frequency band is directly transmitted. In this method, the number of pilots for the high-frequency band signal, the index of the pilot sub-carriers, etc. are exactly the same as those used in the 802.11n / 802.11ac / 802.11ax / 802.11be protocol, such as the number of pilots and the index of the pilot sub-carriers. However, 802.11n / 802.11ac / 802.11ax / 802.11be is a protocol applicable to the sub-7GHz frequency band. When the signal obtained by widening the sub-carrier interval in the protocol is directly transmitted in a frequency band of (super) 45GHz or higher, the channel environment, interference intensity, etc. of the high-frequency band signal are different from those of the low-frequency band, so the original number of pilots is no longer optimal, for example, there may be insufficient pilots. The pilots shown in this application can be understood as pilot sub-carriers. The frequency band of 45GHz or higher shown above may include a frequency band of 45GHz, a frequency band of 60GHz, etc.

[0072] In view of this, embodiments of the present application provide a communication method and apparatus based on PPDU to effectively guarantee the number of pilots such that the receiving end can perform processing based on a large number of pilots, thereby improving the accuracy of correcting the frequency offset and / or phase offset by the receiving end and improving the accuracy of demodulation at the receiving end.

[0073] Before the method provided in the embodiments of the present application is described, the following details the principle of the embodiments of the present application.

[0074] When the sub - carrier interval of a low - frequency band signal is widened to obtain a high - frequency band signal, the sub - carrier interval of the high - frequency band signal is widened, and the signal bandwidth of the high - frequency band signal also increases. The low - frequency band signal shown in this specification may be understood as a signal transmitted on the first low - frequency channel, and the high - frequency band signal may be understood as a signal transmitted on the first high - frequency channel. The signal bandwidth shown in this application is the sample rate of the signal and can be determined based on the base - band sampling clock. In the protocol for the low - frequency band, the signal bandwidth may be equal to the channel bandwidth. However, in the protocol for the high - frequency band, the relationship between the signal bandwidth and the channel bandwidth is not limited. For example, the signal bandwidth may be equal to the channel bandwidth. In another example, the signal bandwidth may be smaller than the channel bandwidth. Of course, alternatively, the signal bandwidth may be larger than the channel bandwidth. The channel bandwidth can be understood as the difference between the upper limit frequency and the lower limit frequency of the signal permitted to pass through. The bandwidth of the first low - frequency channel may include at least one of 20 MHz, 40 MHz, 80 MHz, 160 MHz, and 320 MHz, and the bandwidth of the first high - frequency channel may include at least one of 270 MHz, 320 MHz, 540 MHz, 1080 MHz, 2160 MHz, 4320 MHz, and 8640 MHz. The bandwidth of the first low - frequency channel and the bandwidth of the first high - frequency channel shown in this specification can be understood as the channel bandwidth shown in this application.

[0075] The sub - carrier spacing is increased, but the DFT size corresponding to the first high - frequency channel is the same as the DFT size of the first low - frequency channel. Therefore, the total number of sub - carriers included in the first high - frequency channel is the same as the total number of sub - carriers included in the first low - frequency channel, and there is a mapping relationship between each sub - carrier included in the first high - frequency channel and each sub - carrier included in the first low - frequency channel. For example, the index value of the sub - carrier in the first high - frequency channel is the same as the index value of the sub - carrier in the first low - frequency channel. The above - mentioned "the index value of the sub - carrier in the first high - frequency channel is the same as the index value of the sub - carrier in the first low - frequency channel" can also be understood as the relative index value of the sub - carrier in the first high - frequency channel being the same as the relative index value of the sub - carrier in the first low - frequency channel (that is, for the first high - frequency channel and the first low - frequency channel, the same set of index values is used to mark the sub - carriers). However, the position of the sub - carrier corresponding to a specific index value in the first high - frequency channel is different from the position of the sub - carrier corresponding to that specific index value in the first low - frequency channel. For example, the sub - carrier spacing corresponding to a certain index value in the first high - frequency channel is larger than the sub - carrier spacing corresponding to that index value in the first low - frequency channel. In another example, the frequency of the sub - carrier corresponding to a specific index value in the first high - frequency channel is different from the frequency of the sub - carrier corresponding to that specific index value in the first low - frequency channel. The relative index values shown above are the index value of sub - carrier A in the first high - frequency channel relative to sub - carrier B in the first high - frequency channel, or the index value of sub - carrier A in the first low - frequency channel relative to sub - carrier B in the first low - frequency channel.A and B shown above may be understood as index values of sub - carriers. It can be understood that the absolute position of sub - carrier A in the first high - frequency channel is different from the absolute position of sub - carrier A in the first low - frequency channel, and the absolute position of sub - carrier B in the first high - frequency channel is different from the absolute position of sub - carrier B in the first low - frequency channel. Sub - carrier A and sub - carrier B shown in this specification are general expressions and should not be understood as constraints on the embodiments of this application.

[0076] For example, the bandwidth of the first low - frequency channel is 20 MHz, and the bandwidth of the first high - frequency channel is 270 MHz. When 20 MHz is the channel bandwidth defined in the 802.11ac protocol, the total number of sub - carriers included in the 20 - MHz channel bandwidth is 64, or the DFT size of the channel bandwidth is 64, and the sub - carrier interval of the 20 - MHz channel bandwidth is 312.5 kHz. Correspondingly, the total number of sub - carriers included in the first high - frequency channel may be 64, and the sub - carrier interval may be 3.75 MHz (which is obtained based on 12 times the sub - carrier interval of 312.5 kHz of the 20 - MHz channel bandwidth). It can be understood that the bandwidth obtained based on the sub - carrier interval and the total number of sub - carriers is 3.75 MHz * 64 = 240 MHz, and 240 MHz can be understood as the signal bandwidth of the PPDU transmitted in the first high - frequency channel.

[0077] In another example, the bandwidth of the first low-frequency channel is 20 MHz, and the bandwidth of the first high-frequency channel is 540 MHz. When 20 MHz is the channel bandwidth defined in the 802.11ac protocol, the total number of subcarriers included in the 20-MHz channel bandwidth is 64, or the DFT size of the channel bandwidth is 64, and the subcarrier spacing of the 20-MHz channel bandwidth is 312.5 kHz. Correspondingly, the total number of subcarriers included in the first high-frequency channel is 64, or the DFT size is 64, and the subcarrier spacing is 7.8125 MHz (which is obtained based on 25 times the subcarrier spacing of 312.5 kHz of the 20-MHz channel bandwidth). The bandwidth obtained based on the subcarrier spacing and the total number of subcarriers is 7.8125 MHz * 64 = 500 MHz, and it can be understood that 500 MHz can be understood as the signal bandwidth of the PPDU transmitted in the first high-frequency channel.

[0078] In another example, the bandwidth of the first low-frequency channel is 40 MHz, the bandwidth of the first high-frequency channel is 540 MHz, and the DFT size is 128. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 3.75 MHz. In another example, the bandwidth of the first low-frequency channel is 20 MHz, the bandwidth of the first high-frequency channel is 1080 MHz, and the DFT size is 256. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 3.5156 MHz. In another example, the bandwidth of the first low-frequency channel is 40 MHz, the bandwidth of the first high-frequency channel is 1080 MHz, and the DFT size is 128. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 7.8125 MHz. In another example, the bandwidth of the first low-frequency channel is 80 MHz, the bandwidth of the first high-frequency channel is 1080 MHz, and the DFT size is 256. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 3.5156 MHz. In another example, the bandwidth of the first low-frequency channel is 20 MHz, the bandwidth of the first high-frequency channel is 2160 MHz, and the DFT size is 256. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 7.03125 MHz. In another example, the bandwidth of the first low-frequency channel is 40 MHz, the bandwidth of the first high-frequency channel is 2160 MHz, and the DFT size is 512. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 3.5156 MHz. In another example, the bandwidth of the first low-frequency channel is 80 MHz, the bandwidth of the first high-frequency channel is 2160 MHz, and the DFT size is 256. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 7.03125 MHz. In another example, the bandwidth of the first low-frequency channel is 160 MHz, the bandwidth of the first high-frequency channel is 2160 MHz, and the DFT size is 512. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 3.5156 MHz. In another example, the bandwidth of the first low-frequency channel is 40 MHz, the bandwidth of the first high-frequency channel is 4320 MHz, and the DFT size is 512.In this case, the subcarrier spacing corresponding to the first high-frequency channel is 7.93 MHz. In another example, the bandwidth of the first low-frequency channel is 80 MHz, the bandwidth of the first high-frequency channel is 4320 MHz, and the DFT size is 1024. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 3.91 MHz. In another example, the bandwidth of the first low-frequency channel is 160 MHz, the bandwidth of the first high-frequency channel is 4320 MHz, and the DFT size is 512. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 7.8125 MHz. In another example, the bandwidth of the first low-frequency channel is 80 MHz, the bandwidth of the first high-frequency channel is 8640 MHz, and the DFT size is 1024. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 8.2 MHz. In another example, the bandwidth of the first low-frequency channel is 160 MHz, the bandwidth of the first high-frequency channel is 8640 MHz, and the DFT size is 2048. In this case, the subcarrier spacing corresponding to the first high-frequency channel is 4.05 MHz.

[0079] It can be understood that the subcarrier spacings shown above are only examples and should not be understood as constraints on the embodiments of the present application.

[0080] For the description of the first low-frequency channel and the first high-frequency channel, please further refer to the following description.

[0081] FIG. 2 is a schematic flowchart of a communication method based on a PPDU according to an embodiment of the present application. As shown in FIG. 2, the method includes the following steps.

[0082] 201: The transmitting end generates a PPDU.

[0083] The transmitting end may generate a PPDU based on subcarriers in a first high-frequency channel. For example, the transmitting end may generate OFDM symbols based on a first pilot subcarrier and / or a first data subcarrier, and generate a PPDU based on the OFDM symbols.

[0084] For example, in the frequency domain, the transmitting end may perform channel coding and digital modulation (such as by using quadrature amplitude modulation (QAM) technology), and frequency domain mapping for information bits to generate OFDM symbols, and may perform serial-to-parallel conversion, inverse discrete Fourier transform (IDFT), cyclic prefix insertion and windowing, and parallel-to-serial conversion to obtain a digital signal. Then, the digital signal is converted into an analog signal via a digital-to-analog converter. When the transmitting end performs OFDM modulation, the object to be modulated by the transmitting end may be the content obtained by performing another operation on the information bit stream obtained by the transmitting end, such as quadrature amplitude modulation (QAM) symbols or binary phase shift keying (BPSK) modulation symbols. Details are not enumerated one by one here. The information bit stream shown in this specification may be understood as being obtained based on at least one of the sequences carried in the legacy short training field (L-STF), the sequences carried in the legacy long training field (L-LTF), signaling information, or data source information. In one example, for the process of generating a PPDU by the transmitting end, refer to the method shown in FIG. 3a below.

[0085] 202: The transmitting end transmits a PPDU on a first high-frequency channel. Correspondingly, the receiving end receives the PPDU on the first high-frequency channel.

[0086] The first high-frequency channel includes a first pilot subcarrier and a first data subcarrier. The discrete Fourier transform (DFT) size corresponding to the first high-frequency channel is the same as the DFT size corresponding to the first low-frequency channel. The number of the first pilot subcarriers is larger than the number of the second pilot subcarriers in the first low-frequency channel, and the number of the first data subcarriers is equal to the number of the second data subcarriers in the first low-frequency channel.

[0087] The DFT size may also be referred to as the DFT value, and the DFT size may be the number of points of the discrete Fourier transform. The above-mentioned "the DFT size corresponding to the first high-frequency channel is the same as the DFT size corresponding to the first low-frequency channel" can be understood as at least one of the following. The total number of subcarriers included in the first high-frequency channel is the same as the total number of subcarriers included in the first low-frequency channel. The index value of the subcarriers in the first high-frequency channel is the same as the index value of the subcarriers in the first low-frequency channel. And the sample rate of the signal carried in the first high-frequency channel is an integer multiple of the minimum sample rate of the signal carried in the first low-frequency channel, and the minimum sample rate is 20 MHz. The sampling clock can be reused based on the above-mentioned relationship between the sample rates. The sample rate may also be referred to as the baseband clock frequency, the baseband sampling clock frequency, etc. At the transmitting end, the DFT size may be the size used when the transmitting end performs the IDFT. At the receiving end, it can be understood that the DFT size is the size used when the receiving end performs the DFT.

[0088] In this embodiment of the present application, there may be a mapping relationship between the first pilot subcarrier and at least one of the subsequent subcarriers. In other words, the first pilot subcarrier in the first high-frequency channel maps subsequent subcarriers in the first low-frequency channel, namely, one or more second pilot subcarriers, one or more second guard subcarriers, and one or more second data subcarriers to the first high-frequency channel, and thus can be obtained. The details are described as follows.

[0089] In a possible implementation, there is a mapping relationship between the first pilot subcarrier and the second pilot subcarrier and the second guard subcarrier in the first low-frequency channel. The first pilot subcarrier in the first high-frequency channel can be obtained by mapping the second pilot subcarrier and the second guard subcarrier in the first low-frequency channel to the first high-frequency channel. For example, the index value of the first pilot subcarrier includes at least one of the index value of the second guard subcarrier and the index value of the second pilot subcarrier. For the first pilot subcarrier obtained in this implementation, the change is smaller than the change in the protocol for the low-frequency band.

[0090] In another possible implementation, there is a mapping relationship between the first pilot subcarrier and the second data subcarrier in the first low-frequency channel. For example, the index value of the first pilot subcarrier includes the index value of one or more second data subcarriers. The first pilot subcarrier obtained in this implementation is farther from the filter and safer.

[0091] In yet another possible implementation, there is a mapping relationship between the first pilot subcarrier and the second data subcarrier and the second pilot subcarrier within the first low-frequency channel. For example, the index value of the first pilot subcarrier includes the index value of the second data subcarrier and the index value of the second pilot subcarrier. The first pilot subcarrier obtained in this implementation form is farther from the filter and safer.

[0092] The position of each first pilot subcarrier, the frequency of each first pilot subcarrier, etc. can be obtained based on the index value and subcarrier spacing of the first pilot subcarrier in the first high-frequency channel shown above.

[0093] It can be understood that the above three implementation forms may be independent implementation forms or may be combined with each other. This is not limited in the embodiments of the present application. For the description of the first pilot subcarrier, the first data subcarrier, the first guard subcarrier, the second pilot subcarrier, the second data subcarrier, and the second guard subcarrier, please refer to the following description as shown in Tables 1 to 14.

[0094] 203: The receiving end processes the PPDU.

[0095] The process of generating a PPDU by the transmitting end can be understood as the transmitting end processing information about the signal source in order to convert the information into a signal suitable for transmission. Correspondingly, the process of processing a PPDU by the receiving end can be understood as extracting information about the signal source from the received signal. Therefore, for the process of processing a PPDU by the receiving end, it is desirable to adaptively refer to the process of generating a PPDU by the transmitting end. In a possible implementation form, the step of processing a PPDU by the receiving end may include the following. The receiving end obtains a pilot signal in the PPDU on the first pilot subcarrier corresponding to the index value based on the index value of the first pilot subcarrier, and then performs processing based on the pilot signal. For example, the receiving end may perform phase offset estimation and / or compensation based on the pilot signal. In another example, the receiving end may perform frequency offset estimation and / or compensation based on the pilot signal. Therefore, the receiving end can correct the phase offset of the data subcarrier, thereby improving the accuracy of demodulation. In an example, for the process of processing a PPDU by the receiving end, refer to the method shown in FIG. 3b below.

[0096] Of course, the receiving end can further perform channel estimation, channel equalization, synchronization, etc. based on the PPDU. Details will not be described one by one here.

[0097] It should be understood that this embodiment of the present application mainly relates to the index values of pilot subcarriers, data subcarriers, etc. used when a PPDU is generated. For the frame structure of the PPDU, refer to the relevant standards or protocols. Details are not enumerated in the embodiments of the present application.

[0098] It should be noted that the first high-frequency channel and the subcarriers included in the first high-frequency channel are described above by describing the mapping relationship between the first high-frequency channel and the first low-frequency channel. However, in some implementations, it can be understood that the mapping relationship between the first high-frequency channel and the first low-frequency channel is described in the protocol. In another implementation, the first pilot subcarrier and the first data subcarrier in the first high-frequency channel can be set or specified in the protocol. Therefore, the above method can be replaced by the transmitting end generating a PPDU and transmitting the PPDU on the first high-frequency channel, and correspondingly, the receiving end receiving and processing the PPDU. The bandwidth of the first high-frequency channel is any one of 270 MHz, 320 MHz, 540 MHz, 1080 MHz, 2160 MHz, 4320 MHz, and 8640 MHz. The first high-frequency channel includes a first pilot subcarrier, and the number of the first pilot subcarriers is at least one of 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, and 38. All the subcarriers in the first high-frequency channel include data subcarriers, pilot subcarriers, DC subcarriers, guard subcarriers, etc. The total number of subcarriers is any one of 64, 128, 256, 512, 1024, and 2048. It can be understood that for the index values and / or positions of all the first pilot subcarriers, reference may be made to the above description. Details will not be described again here. For the index value of the first pilot subcarrier and the index value of the first guard subcarrier, please refer to Tables 1 to 14 below.

[0099] In this embodiment of the present application, since it is guaranteed that the number of first pilot subcarriers is larger than the number of second pilot subcarriers, the receiving end has a sufficient amount of pilots to correct the frequency offset, thereby improving the accuracy of data demodulation by the receiving end. In the approach of directly expanding the subcarrier interval of the low-frequency band signal to obtain a high-frequency band signal while keeping the number of pilots unchanged, since the interference of the high-frequency band signal is larger than that of the low-frequency band signal, when the number of pilots does not change, the receiving end may not have a sufficient amount of pilots to correct the frequency offset. As a result, the phase offset estimation at the receiving end may be inaccurate, and the phase offset related to the data subcarriers cannot be accurately compensated. This affects the accuracy of signal demodulation. Furthermore, according to the method provided in this embodiment of the present application, the principle of processing the high-frequency band signal may be the same as the principle of processing the low-frequency band signal. This realizes the compatibility of the baseband chip. According to the method provided in this embodiment of the present application, the modification to the low-frequency baseband chip can be reduced. This helps to reuse the baseband for high-frequency and low-frequency signals.

[0100] The following details the process of generating a PPDU by the transmitting end and the process of processing a PPDU by the receiving end.

[0101] FIG. 3a is a diagram of the process of generating a PPDU by the transmitting end according to this embodiment of the present application. As shown in FIG. 3a, the process of generating a PPDU by the transmitting end can be shown as follows.

[0102] Scrambling (or the scrambler shown in Figure 3a), LDPC encoding (or the encoder shown in Figure 3a), stream parsing (or the stream parser shown in Figure 3a), constellation mapping (or the constellation mapper shown in Figure 3a), LDPC tone mapping (or the LDPC tone mapper shown in Figure 3a), cyclic shift diversity per spatial stream (CSD per SS), spatial and frequency mapping, and other processing may be performed on the information bits to form a frequency-domain signal, a time-domain signal is formed through the IDFT, then an OFDM symbol is formed through cyclic prefix insertion and windowing (insertGI and window), and then the OFDM symbol is transmitted through analog and radio frequency (analog and RF) circuits. A plurality of OFDM symbols form a PPDU. Optionally, prior to forward error correction (FEC) (pre-FEC shown in Figure 3a) coding, the transmitting end may further perform PHY padding. Optionally, after FEC (post-FEC shown in Figure 3a), the transmitting end may further perform PHY padding.

[0103] Figure 3b is a diagram of the process of processing a PPDU by the receiving end according to this embodiment of the present application. As shown in Figure 3b, the process of processing a PPDU by the receiving end may be shown as follows.

[0104] For each OFDM symbol in the PPDU, the signal can first be received through analog and radio frequency circuits. After the signal is converted into a digital baseband signal, the cyclic prefix is removed, then the frequency domain signal is obtained through DFT, then the pilot signal is processed to correct the phase offset and / or frequency offset, the influence on the channel is eliminated through channel estimation and equalization, and finally, through deinterleaving (or the demapper shown in FIG. 3b), constellation point demapping (which can also be called constellation demapping or the constellation demapper shown in FIG. 3b), channel decoding (the LDPC decoding or decoder shown in FIG. 3b), descrambling (or the descrambler shown in FIG. 3b), and other operations, the source information bits are restored.

[0105] It should be understood that the processes shown in FIGS. 3a and 3b are merely examples. There may be a large number or a small number of steps in the step of generating the PPDU by the transmitting end, and there may be a large number or a small number of steps in the step of processing the PPDU by the receiving end. This is not limited in the embodiments of this application.

[0106] The following describes the pilot subcarriers provided in this embodiment of this application with reference to specific examples. It should be understood that the first pilot subcarriers shown in Tables 1 to 14 below are merely examples. In a specific implementation, there may be more first pilot subcarriers, or the index values of the first pilot subcarriers may be different. This is not limited in the embodiments of this application.

Example

[0107] In the 802.11ac protocol, the tone plan in a 20 MHz bandwidth can be shown as follows. It includes 64 subcarriers, and the index values of the subcarriers are sequentially defined as -32:31. The subcarrier with an index value of 0 is a direct current subcarrier, and the value carried is 0. The subcarriers with index values of -32:-29 and 29:31 are guard subcarriers, i.e., [-32, -31, -30, -29, 29, 30, 31], and the value carried is 0. The subcarriers with index values of [-21, -7, 7, 21] are pilot subcarriers, and the value carried is +1 or -1. The rest are data subcarriers that carry modulation symbols. In 802.11ac, it can be understood that the pilot subcarriers shown herein are the second pilot subcarriers shown in this embodiment of the present application, the guard subcarriers shown herein are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown herein are the data subcarriers corresponding to the second pilot subcarriers.

[0108] Optionally, a subcarrier that is within a high-frequency channel and has a mapping relationship with a guard subcarrier in a low-frequency channel can be used as a pilot subcarrier. In other words, a subcarrier that is within a high-frequency channel and has the same index value as that of a guard subcarrier in a low-frequency channel is used as a pilot subcarrier. Or, the index values of some pilot subcarriers in a high-frequency channel are the same as those of guard subcarriers in a low-frequency channel. Optionally, a subcarrier that is within a high-frequency channel and has a mapping relationship with a pilot subcarrier in a low-frequency channel can be used as a pilot subcarrier. In other words, a subcarrier that is within a high-frequency channel and has the same index value as that of a pilot subcarrier in a low-frequency channel is used as a pilot subcarrier. Or, the index values of some pilot subcarriers in a high-frequency channel are the same as those of pilot subcarriers in a low-frequency channel. For example, the index value of a first pilot subcarrier can satisfy at least one of the following: being the same as the index values of one to seven second guard subcarriers described above, and being the same as the index values of one to four second pilot subcarriers described above. As shown in Table 1, the position of the first pilot subcarrier may be determined based on the subcarrier spacing of the first high-frequency channel and the index value of the first pilot subcarrier, or may be determined based on the subcarrier spacing of the first high-frequency channel, the subcarrier spacing of the first low-frequency channel, the position of the second pilot subcarrier within the 20 MHz bandwidth in 802.11ac, and the position of the second guard subcarrier selected as an auxiliary first pilot subcarrier. Optionally, a subcarrier that is within a high-frequency channel and has a mapping relationship with a data subcarrier in a low-frequency channel can be used as a pilot subcarrier.In other words, a sub - carrier that is within the high - frequency channel and has the same index value as the index value of a data sub - carrier within the low - frequency channel is used as a pilot sub - carrier. Or, the index values of some pilot sub - carriers within the high - frequency channel are the same as the index values of data sub - carriers within the low - frequency channel. For example, the index value of the first pilot sub - carrier may satisfy at least one of the following. The index value of the first pilot sub - carrier is the same as the index value of one or more second data sub - carriers, and the index value of the first pilot sub - carrier is the same as the index values of one to four second pilot sub - carriers. The first pilot sub - carrier shown in Table 2 can be understood as a re - configured pilot sub - carrier. In this embodiment of the present application, the relationship between the pilot sub - carriers in the high - frequency channel and the data sub - carriers in the low - frequency channel, the relationship between the pilot sub - carriers in the high - frequency channel and the pilot sub - carriers in the low - frequency channel, and the relationship between the pilot sub - carriers in the high - frequency channel and the guard sub - carriers in the low - frequency channel can be understood to be applicable to other embodiments shown in the present application, such as Examples 2 to 7 shown below.

[0109] For example, Tables 1 and 2 show the index values of the first pilot subcarriers and the index values of the first guard subcarriers provided in this embodiment of the present application. In Tables 1 and 2, [-21, -7, 7, 21] is the same as the index value of the second pilot subcarrier, and [-32, -31, -30, -29, 29, 30, 31] is the same as the index value of the second guard subcarrier. For example, in the second row of Table 1, the subcarrier corresponding to the index value -29 of the first pilot subcarrier can be understood to have a mapping relationship with the guard subcarrier in the 20 MHz bandwidth in 802.11ac. In other words, a subcarrier that is in the high-frequency channel and whose index value is the same as the index value of the guard subcarrier in the low-frequency channel is used as a pilot subcarrier. In another example, in the second row of Table 2, the subcarriers corresponding to the index values [-25, -15, -5, 5, 15] of the first pilot subcarrier can be understood to each have a mapping relationship with the data subcarriers (i.e., five second data subcarriers) in the 20 MHz bandwidth in 802.11ac. In other words, a subcarrier that is in the high-frequency channel and whose index value is the same as the index value of the data subcarrier in the low-frequency channel is used as a pilot subcarrier. In Tables 1 and 2, the number of the first pilot subcarriers is larger than the number of the second pilot subcarriers, the number of the first data subcarriers is equal to the number of the second data subcarriers, and the number of the first guard subcarriers is smaller than the number of the second guard subcarriers.

[0110]

Table 1

[0111] The changes to the first pilot subcarriers and the first guard subcarriers shown in Table 1 are smaller than the changes to the second pilot subcarriers and the second guard subcarriers.

[0112] It can be understood that all the remaining index values among the index values from -32:31, except for the index value of the first pilot subcarrier shown in Table 1, the index value of the first guard subcarrier shown in Table 1, and the index value of the DC subcarrier (the index value is 0), are the index values of the first data subcarriers.

[0113]

Table 2

[0114] The first guard subcarriers shown in Table 2 can be distributed throughout the frequency band such that the frequencies are symmetric with respect to positive and negative, as evenly and discretely as possible. This can effectively improve the accuracy of the phase offset and / or frequency offset by the receiving end. The first pilot subcarriers shown in Table 2 are far from the filter and have high safety. It can be understood that all the remaining index values among the index values from -32:31, except for the index value of the first pilot subcarrier shown in Table 2, the index value of the first guard subcarrier shown in Table 2, and the index value of the DC subcarrier (the index value is 0), are the index values of the first data subcarriers.

[0115] It can be understood that the last row of each of Table 1 and Table 2 indicates the absence of guard subcarriers. Optionally, when the high-frequency channel does not include guard subcarriers, the guard bandwidth shown below can be used as the bandwidth of the transition band with respect to the guard bandwidth shown below. It can be understood that the description of the guard subcarriers is also applicable to Examples 2 to 7 below. The details will not be described again below.

[0116] In Example 1 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 20 MHz, and the bandwidth of the first high-frequency channel may be any one of 270 MHz, 540 MHz, 1080 MHz, and 2160 MHz.

Example

[0117] In the 802.11ac protocol, the tone plan in the 40 MHz bandwidth can be shown as follows. It includes 128 subcarriers, and the index values of the subcarriers are sequentially defined as -64:63. The subcarriers with index values of -1, 0, and 1 are direct current subcarriers, and the value carried is 0. The subcarriers with index values of -64:-59 and 59:63 are guard subcarriers, that is, [-64, -63, -62, -61, -60, -59, 59, 60, 61, 62, 63], and the value carried is 0. The subcarriers with index values of [-53, -25, -11, 11, 25, 53] are pilot subcarriers, and the value carried is +1 or -1. The rest are data subcarriers. In 802.11ac, the pilot subcarriers shown in this specification are the second pilot subcarriers shown in this embodiment of the present application, the guard subcarriers shown in this specification are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown in this specification are the data subcarriers corresponding to the second pilot subcarriers.

[0118] For the relationship between the pilot subcarriers in the high-frequency channels and the data subcarriers in the low-frequency channels, the relationship between the pilot subcarriers in the high-frequency channels and the pilot subcarriers in the low-frequency channels, and the relationship between the pilot subcarriers in the high-frequency channels and the guard subcarriers in the low-frequency channels, refer to the description of Example 1. Details will not be described again here. For example, the index value of the first pilot subcarrier may satisfy at least one of the following. The index value of the first pilot subcarrier is the same as the index values of the above-mentioned 1 to 11 second guard subcarriers, and the index value of the first pilot subcarrier is the same as the index values of the 1 to 6 second pilot subcarriers. The position of each first pilot subcarrier shown in Table 3 can be determined based on the subcarrier interval of the first high-frequency channel and the index value of the first pilot subcarrier. In another example, the index value of the first pilot subcarrier may satisfy at least one of the following. The index value of the first pilot subcarrier is the same as the index values of one or more second data subcarriers, and the index value of the first pilot subcarrier is the same as the index values of the 1 to 6 second pilot subcarriers. The first pilot subcarrier shown in Table 4 can be understood as a reconfigured pilot subcarrier.

[0119] For example, Tables 3 and 4 show the index values of the first pilot sub-carriers and the index values of the first guard sub-carriers provided in this embodiment of the present application. In Tables 3 and 4, [-53, -25, -11, 11, 25, 53] is the same as the index value of the second pilot sub-carrier, and [-64, -63, -62, -61, -60, -59, 59, 60, 61, 62, 63] is the same as the index value of the second guard sub-carrier. For example, in the second row of Table 3, the sub-carrier corresponding to the index value -59 of the first pilot sub-carrier can be understood to have a mapping relationship with the guard sub-carrier in the 40 MHz bandwidth in 802.11ac. In other words, a sub-carrier that is in the high-frequency channel and whose index value is the same as the index value of the guard sub-carrier in the low-frequency channel is used as a pilot sub-carrier. In another example, in the second row of Table 4, the sub-carriers corresponding to the index values [-49, -35, -21, -7, 7, 21, 35] of the first pilot sub-carrier can be understood to have mapping relationships with the data sub-carriers (i.e., the seven data sub-carriers corresponding to the second pilot sub-carrier) in the 40 MHz bandwidth in 802.11ac respectively. In other words, a sub-carrier that is in the high-frequency channel and whose index value is the same as the index value of the data sub-carrier in the low-frequency channel is used as a pilot sub-carrier.

[0120]

Table 3

[0121] It can be understood that all the remaining index values among the index values from -64 to 63, excluding the index value of the first pilot subcarrier shown in Table 3, the index value of the first guard subcarrier shown in Table 3, and the index value of the DC subcarrier (the index values are -1, 0, and 1), are the index values of the first data subcarriers.

[0122] [Table 4]

[0123] It can be understood that all the remaining index values among the index values from -64 to 63, excluding the index value of the first pilot subcarrier shown in Table 4, the index value of the first guard subcarrier shown in Table 4, and the index value of the DC subcarrier (the index values are -1, 0, and 1), are the index values of the first data subcarriers.

[0124] In Example 2 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 40 MHz, and the bandwidth of the first high-frequency channel may be any one of 540 MHz, 1080 MHz, 2160 MHz, and 4320 MHz. [Example]

[0125] In the 802.11ac protocol, the tone plan in the 80 MHz bandwidth can be shown as follows. It includes 256 subcarriers, and the index values of the subcarriers are sequentially defined as -128:127. The subcarriers with index values of -1, 0, and 1 are direct current subcarriers, and the value carried is 0. The subcarriers with index values of -128:-123 and 123:127, i.e., [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127], are guard subcarriers, and the value carried is 0. The subcarriers with index values of [-103, -75, -39, -11, 11, 39, 75, 103] are pilot subcarriers, and the value carried is +1 / -1. The rest are data subcarriers. In 802.11ac, the pilot subcarriers shown in this specification are the second pilot subcarriers shown in this embodiment of this application, the guard subcarriers shown in this specification are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown in this specification are the data subcarriers corresponding to the second pilot subcarriers.

[0126] For the relationship between the pilot subcarriers in the high-frequency channels and the data subcarriers in the low-frequency channels, the relationship between the pilot subcarriers in the high-frequency channels and the pilot subcarriers in the low-frequency channels, and the relationship between the pilot subcarriers in the high-frequency channels and the guard subcarriers in the low-frequency channels, refer to the descriptions of Example 1 and Example 2. Details are not described again here. For example, the index value of the first pilot subcarrier may satisfy at least one of the following. The index value of the first pilot subcarrier is the same as the index values of the above-mentioned 1 to 11 second guard subcarriers, and the index value of the first pilot subcarrier is the same as the index values of the above-mentioned 1 to 8 second pilot subcarriers. The position of each first pilot subcarrier shown in Table 5 can be determined based on the subcarrier interval of the first high-frequency channel and the index value of the first pilot subcarrier. In another example, the index value of the first pilot subcarrier may satisfy at least one of the following. The index value of the first pilot subcarrier is the same as the index values of one or more second data subcarriers, and the index value of the first pilot subcarrier is the same as the index values of the above-mentioned 1 to 8 second pilot subcarriers. The first pilot subcarrier shown in Table 6 can be understood as a reconfigured pilot subcarrier.

[0127] For example, Tables 5 and 6 show the index values of the first pilot subcarriers and the index values of the first guard subcarriers provided in this embodiment of the present application.

[0128]

Table 5

[0129] It can be understood that all the remaining index values within the index values of -128:127, excluding the index values of the first pilot subcarriers shown in Table 5, the index values of the first guard subcarriers shown in Table 5, and the index values of the DC subcarriers (the index values are -1, 0, 1), are the index values of the first data subcarriers.

[0130]

Table 6

[0131] It can be understood that all the remaining index values within the index values of -128:127, excluding the index values of the first pilot subcarriers shown in Table 6, the index values of the first guard subcarriers shown in Table 6, and the index values of the DC subcarriers (the index values are -1, 0, 1), are the index values of the first data subcarriers.

[0132] In Example 1 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 80 MHz, and the bandwidth of the first high-frequency channel may be any one of 1080 MHz, 2160 MHz, 4320 MHz, and 8640 MHz.

Example

[0133] In the 802.11ax protocol, the tone plan in a 20 MHz bandwidth can be shown as follows. It includes 256 subcarriers, and the index values of the subcarriers are sequentially defined as -128:127. The subcarriers with index values of -1, 0, and 1 are direct current subcarriers, and the value carried is 0. The subcarriers with index values of -128:-123 and 123:127, i.e., [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127], are guard subcarriers, and the value carried is 0. The subcarriers with index values of [-116, -90, -48, -22, 22, 48, 90, 116] are pilot subcarriers, and the value carried is +1 / -1. The rest are data subcarriers. In 802.11ax, the pilot subcarriers shown in this specification are the second pilot subcarriers shown in this embodiment of this application, the guard subcarriers shown in this specification are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown in this specification are the data subcarriers corresponding to the second pilot subcarriers.

[0134] For the relationship between the pilot subcarriers in the high-frequency channel and the data subcarriers in the low-frequency channel, the relationship between the pilot subcarriers in the high-frequency channel and the pilot subcarriers in the low-frequency channel, and the relationship between the pilot subcarriers in the high-frequency channel and the guard subcarriers in the low-frequency channel, refer to the descriptions of Examples 1 to 3. Details are not described again here. The position of each first pilot subcarrier shown in Table 7 can be determined based on the subcarrier spacing of the first high-frequency channel and the index value of the first pilot subcarrier. The first pilot subcarriers shown in Table 8 can be understood as the reconfigured pilot subcarriers.

[0135] For example, Tables 7 and 8 show the index values of the first pilot subcarrier and the index value of the first guard subcarrier provided in this embodiment of the present application.

[0136] [Table 7]

[0137] It can be understood that all the remaining index values within the index values of -128:127, other than the index value of the first pilot subcarrier shown in Table 7, the index value of the first guard subcarrier shown in Table 7, and the index value of the DC subcarrier (the index values are -1, 0, 1), are the index values of the first data subcarriers.

[0138] [Table 8]

[0139] It can be understood that all the remaining index values within the index values of -128:127, other than the index value of the first pilot subcarrier shown in Table 8, the index value of the first guard subcarrier shown in Table 8, and the index value of the DC subcarrier (the index values are -1, 0, 1), are the index values of the first data subcarriers.

[0140] In Example 4 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 20 MHz, and the bandwidth of the first high-frequency channel may be either 1080 MHz or 2160 MHz. [Example]

[0141] In the 802.11ax protocol, the tone plan in a 40 MHz bandwidth can be shown as follows. It includes 512 subcarriers, and the index values of the subcarriers are sequentially defined as -256:255. The subcarriers with index values of -2, 1, 0, 1, and 2 are direct current subcarriers, and the value carried is 0. The subcarriers with index values of -256:-245 and 245:255, i.e., [-256, -255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255], are guard subcarriers, and the value carried is 0. The subcarriers with index values of [-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238] are pilot subcarriers, and the value carried is +1 / -1. The rest are data subcarriers. In 802.11ax, the pilot subcarriers shown in this specification are the second pilot subcarriers shown in this embodiment of this application, the guard subcarriers shown in this specification are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown in this specification are the data subcarriers corresponding to the second pilot subcarriers.

[0142] For the relationship between the pilot subcarriers in the high-frequency channels and the data subcarriers in the low-frequency channels, the relationship between the pilot subcarriers in the high-frequency channels and the pilot subcarriers in the low-frequency channels, and the relationship between the pilot subcarriers in the high-frequency channels and the guard subcarriers in the low-frequency channels, refer to the descriptions of Examples 1 to 4. Details are not explained again here. The position of each first pilot subcarrier shown in Table 9 can be determined based on the subcarrier spacing of the first high-frequency channel and the index value of the first pilot subcarrier. The first pilot subcarrier shown in Table 10 can be understood as the reconfigured pilot subcarrier.

[0143] For example, Tables 9 and 10 show the index values of the first pilot subcarriers and the index values of the first guard subcarriers provided in this embodiment of the present application.

[0144]

Table 9

[0145] It can be understood that all the remaining index values other than the index values of the first pilot subcarriers shown in Table 9, the index values of the first guard subcarriers shown in Table 9, and the index values of the DC subcarriers (the index values are -2, -1, 0, 1, and 2) within the index value range of -256:255 are the index values of the first data subcarriers.

[0146]

Table 10

[0147] It can be understood that all remaining index values other than the index values of the first pilot subcarriers shown in Table 10, the index values of the first guard subcarriers shown in Table 10, and the index value of the DC subcarrier (the index values are -2, -1, 0, 1, and 2) within the index values -256:255 are the index values of the first data subcarriers.

[0148] In Example 5 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 40 MHz, and the bandwidth of the first high-frequency channel may be any one of 1080 MHz, 2160 MHz, and 4320 MHz.

Example

[0149] In the 802.11ax protocol, the tone plan in the 80 MHz bandwidth can be shown as follows. It includes 1024 subcarriers, and the index values of the subcarriers are sequentially defined as -512:511. The subcarriers with index values of -2, 1, 0, 1, and 2 are direct current subcarriers, and the value carried is 0. The subcarriers with index values of -512:-501 and 501:511, that is, [-512, -511, -510, -519, -518, -517, -516, -515, -514, -513, -512, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511] are guard subcarriers, and the value carried is 0. The subcarriers with index values of [-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468] are pilot subcarriers, and the value carried is +1 / -1. The rest are data subcarriers. In 802.11ax, the pilot subcarriers shown in this specification are the second pilot subcarriers shown in this embodiment of this application, the guard subcarriers shown in this specification are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown in this specification are the data subcarriers corresponding to the second pilot subcarriers.

[0150] For the relationship between the pilot subcarriers in the high-frequency channels and the data subcarriers in the low-frequency channels, the relationship between the pilot subcarriers in the high-frequency channels and the pilot subcarriers in the low-frequency channels, and the relationship between the pilot subcarriers in the high-frequency channels and the guard subcarriers in the low-frequency channels, refer to the descriptions in Examples 1 to 5. Details will not be described again here. The position of each first pilot subcarrier shown in Table 11 can be determined based on the subcarrier spacing of the first high-frequency channel and the index value of the first pilot subcarrier. The first pilot subcarriers shown in Table 12 can be understood as the reconfigured pilot subcarriers.

[0151] For example, Tables 11 and 12 show the index values of the first pilot subcarriers and the index values of the first guard subcarriers provided in this embodiment of the present application.

[0152]

Table 11

[0153] It can be understood that, among the index values from -512 to 511, the index value of the first pilot subcarrier shown in Table 11, the index value of the guard subcarrier corresponding to the first pilot subcarrier shown in Table 11, and all the remaining index values other than the direct current subcarriers (the index values are -2, -1, 0, 1, and 2) are the index values of the data subcarriers corresponding to the first pilot subcarrier.

[0154]

Table 12

[0155] It can be understood that all the remaining index values other than the index values of the first pilot subcarriers shown in Table 12, the index values of the first guard subcarriers shown in Table 12, and the index value of the DC subcarrier (the index values are -2, -1, 0, 1, and 2) within the index value range of -256:255 are the index values of the first data subcarriers.

[0156] In Example 6 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 80 MHz, and the bandwidth of the first high-frequency channel may be either 4320 MHz or 8640 MHz.

Example

[0157] In the 802.11be protocol, the tone plan in the 80 MHz bandwidth can be shown as follows. It includes 1024 subcarriers, and the index values of the subcarriers are sequentially defined as -512:511. The subcarriers with index values of -2, 1, 0, 1, and 2 are DC subcarriers, and the value carried is 0. The subcarriers with index values of -512:-501 and 501:511 are guard subcarriers, and the value carried is 0. The subcarriers with index values of [-468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468] are pilot subcarriers, and the value carried is +1 / -1. The rest are data subcarriers. In 802.11be, the pilot subcarriers shown in this specification are the second pilot subcarriers shown in this embodiment of the present application, the guard subcarriers shown in this specification are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown in this specification are the data subcarriers corresponding to the second pilot subcarriers.

[0158] For the relationship between the pilot subcarriers in the high-frequency channels and the data subcarriers in the low-frequency channels, the relationship between the pilot subcarriers in the high-frequency channels and the pilot subcarriers in the low-frequency channels, and the relationship between the pilot subcarriers in the high-frequency channels and the guard subcarriers in the low-frequency channels, refer to the descriptions in Examples 1 to 6. Details are not described again here. The position of each first pilot subcarrier shown in Table 13 can be determined based on the subcarrier spacing of the first high-frequency channel and the index value of the first pilot subcarrier. The first pilot subcarrier shown in Table 14 can be understood as a reconfigured pilot subcarrier.

[0159] For example, Tables 13 and 14 show the index values of the first pilot subcarriers and the index values of the first guard subcarriers provided in this embodiment of the present application.

[0160]

Table 13

[0161] It can be understood that all the remaining index values other than the index values of the first pilot subcarriers shown in Table 13, the index values of the first guard subcarriers shown in Table 13, and the index values of the DC subcarriers (the index values are -2, -1, 0, 1, and 2) within the index value range of -512:511 are the index values of the first data subcarriers.

[0162]

Table 14

[0163] It can be understood that all the remaining index values in the index value range of -512:511, other than the index values of the first pilot subcarriers shown in Table 14, the index values of the first guard subcarriers shown in Table 14, and the index values of the DC subcarriers (the index values are -2, -1, 0, 1, and 2), are the index values of the first data subcarriers.

[0164] In Example 7 shown in this embodiment of the present application, the bandwidth of the first low-frequency channel may be 80 MHz, and the bandwidth of the first high-frequency channel may be either 4320 MHz or 8640 MHz.

[0165] Regarding the descriptions of 20 MHz and 40 MHz in the 802.11be protocol, it can be understood that the relevant descriptions of 20 MHz (as shown in Tables 7 and 8) and 40 MHz (as shown in Tables 9 and 10) in the 802.11ax protocol may be referred to. Details will not be described again here. The bandwidths in the examples shown above are only examples and should not be understood as constraints on the embodiments of the present application. For parts not described in detail in the examples shown above, please refer to other examples.

[0166] FIG. 4 is a diagram of the emulation result according to this embodiment of the present application. In the diagram of the emulation shown in FIG. 4, the horizontal coordinate represents the received signal-to-noise ratio, and the vertical coordinate represents the packet error rate. The emulation is shown based on the last row shown in Table 5 as an example. Specifically, when the index values of the current pilot subcarriers shown in FIG. 4 are [-103, -75, -39, -11, 11, 39, 75, 103], the index values of the added pilot subcarriers shown in FIG. 4 are [-128, -127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126, 127]. From FIG. 4, it can be seen that for the same packet error rate, the PPDU generated by using the first pilot subcarriers provided in this embodiment of the present application has lower requirements for the external environment. When the PER reaches 10%, the required received signal-to-noise ratio in this scheme decreases by only 1 dB.

[0167] In this embodiment of the present application, in Examples 1 to 7 shown above, when the second guard subcarrier is used as the first pilot subcarrier, for the signal (SIG) part and the data part in the PPDU, the guard subcarrier selected as the auxiliary first pilot subcarrier no longer carries 0, but carries +1 or -1.

[0168] The SIG part in the PPDU may vary depending on the different frame structures. For example, in a high throughput (HT) PPDU, the SIG part may be an HT-SIG. In a very high throughput (VHT) PPDU, the SIG part may be a VHT-SIG-A or a VHT-SIG-B. In a high efficiency (HE) PPDU, the SIG part may be an HE-SIG-A or an HE-SIG-B. In an extremely high throughput (EHT) PPDU, the SIG part may be an EHT-SIG. It can be understood that the PPDUs listed in this specification are only examples. With the development of the standard, PPDUs with different structures may appear in the future, and the pilot subcarriers used in the L-STF part, L-LTF part, SIG part, and data part of the PPDU are also within the protection scope of this application.

[0169] In this embodiment of the present application, the PPDU includes a legacy long training field (L-LTF) and may further include any one of HT-LTF, VHT-LTF, HE-LTF, and EHT-LTF. The LTF sequence can be classified into 1x sequence, 2x sequence, and 4x sequence. The LTF 1x sequence indicates that there are at least three 0s between two non-zero elements. The LTF 2x sequence indicates that there is at least one 0 between two non-zero elements. The LTF 4x sequence has non-consecutive non-zero elements, indicating that the density of non-zero elements in the LTF 4x sequence is the highest, and thus the channel estimation is the most accurate. The OFDM symbol occupied by the LTF is generated based on the LTF sequence. Generally, the value carried by the pilot subcarrier is +1 or -1. In this embodiment of the present application, when the OFDM symbol occupied by the LTF is generated by using the first pilot subcarrier, the value carried by the first pilot subcarrier can be determined based on the peak to average power ratio (PAPR). For example, in the first row of Table 5 in Example 3 shown above, the subcarrier with an index value of -123 is the first pilot subcarrier. In the 802.11ac protocol, the value carried by the subcarrier with an index value of -123 is 0. However, in this embodiment of the present application, the value carried by the subcarrier with an index value of -123 can be 1. For example, in Example 3 shown above, the subcarriers with index values of -125, -124, -123, 123, and 124 are the first pilot subcarriers. In the 802.11ac protocol, the values carried by the subcarriers with index values of -125, -124, -123, 123, and 124 are 0.However, in this embodiment of the present application, the values carried by the subcarriers whose index values are -125, -124, -123, 123, and 124 can be sequentially [1 -1 -1 -1 -1]. In other words, the transmitting end may adaptively modify the values of the sequence carried by the LTF based on the PAPR. For example, the values of some sequences carried by the LTF may be modified.

[0170] PAPR is sometimes abbreviated as peak-to-average ratio and is the ratio of the instantaneous power peak of a signal to the average signal power of a signal sequence, and can be expressed by the following formula.

[0171]

Equation

[0172] X i represents the time-domain discrete value of the signal in the signal sequence, and max(X i 2 ) represents the maximum value of the square of the time-domain discrete value in the signal sequence, that is, the instantaneous power peak of the signal, and mean(X i 2 ) represents the average value of the square of the time-domain discrete value, that is, the average signal power.

[0173] It is well known that frequency domain equalization techniques are used in OFDM. Therefore, the accuracy of channel estimation has a significant impact on communication performance. However, OFDM systems have the drawback of high PAPR, especially in large bandwidths, and more subcarriers lead to more severe PAPR. High PAPR leads to non-linear signal distortion and degrades system performance. Therefore, in LTE sequence design, low PAPR is an important metric to make channel estimation more accurate. Since the signal transmission methods (P matrix and R matrix) of pilot subcarriers and data subcarriers are different, the positions and quantities of pilot subcarriers are different, resulting in different PAPRs of LTF. However, the first pilot subcarrier provided in this embodiment of the present application is used. This can ensure that the receiving end has sufficient pilots for phase offset and / or frequency offset, and can ensure low PAPR of LTF.

[0174] Generally, the guard band formed by guard sub-carriers is usually reserved for the filter as the bandwidth of the transition band. When indicators such as out-of-band rejection and in-band flatness are determined, the bandwidth of the transition band affects the order of the filter, and the specific design of the bandwidth of the transition band is determined based on the implementation form. In this embodiment of the present application, since some guard sub-carriers are converted into the first pilot sub-carriers for use, the remaining guard band may be insufficient as the bandwidth of the transition band. Optionally, the transmitter may adjust the sample rate of the signal, that is, the signal bandwidth, so that the signal bandwidth is smaller than the channel bandwidth. Optionally, to ensure a sufficient guard band, the sample rate of the high-frequency band signal transmitted by the transmitter is smaller than the sample rate of the channel bandwidth. For example, the guard sub-carriers that are not converted into pilot sub-carriers, and the difference obtained by subtracting the signal bandwidth from the channel bandwidth are used together as the guard band. In another example, the difference obtained by subtracting the signal bandwidth from the channel bandwidth is used as the guard band. Of course, the above methods for adjusting the sample rate are just examples. In this embodiment of the present application, when the transmitter transmits a PPDU on the first high-frequency channel, the signal bandwidth of the PPDU is smaller than the bandwidth of the first high-frequency channel. For example, the difference between the signal bandwidth and the bandwidth of the first high-frequency channel is sufficient to be reserved as the guard band. In this case, the transmitter may not need to adjust the sample rate according to the above method.

[0175] OFDM is a fundamental transmission method in current wireless communication and is widely applied to wireless communication systems such as LTE, WiMAX, and Wi-Fi. In addition, OFDM is further applied to fixed network transmissions, such as optical fiber, copper wire cable, and cable transmissions. The basic principle of OFDM is to minimize the subcarrier spacing within an acceptable range based on the orthogonality of subcarriers. This can ensure that a plurality of parallel paths that do not interfere with each other are formed, and the frequency utilization efficiency of the system can be improved. Furthermore, since OFDM has the above-mentioned characteristics, when subcarriers in OFDM that do not interfere with each other are allocated to multiple users, multi-user access or data transmission can be implemented by using OFDM. This is orthogonal frequency division multiple access (OFDMA). OFDMA may be used to implement multi-user data simultaneous transmission and is an effective method for improving the simultaneity of data transmission. A resource unit (RU) is defined in the 802.11ax protocol, and a multiple resource unit (MRU) is further defined in the 802.11be protocol and is formed by combining a plurality of fixedly combined RUs. An RU smaller than 242 tones is called a small RU, and an RU of 242 tones or more is called a large RU. The combinations supported by large RUs are different for OFDMA transmission and non-OFDM transmission. One type of 996 + 484 + 242 tone RU is additionally supported for non-OFDMA transmission, and the other supported combinations are the same. Other combinations shown in this specification may include combinations supported by large RUs, such as 996 + 484 and 2*996 + 484, that is, combinations supported for both OFDMA and non-OFDMA. For the distribution of RUs or MRUs in different bandwidths, refer to the relevant standards or protocols. Details are not described again here.For example, a small RU may include a 26-tone RU, a 52-tone RU, or a 106-tone RU.

[0176] In one possible implementation, the transmitter may transmit a signal in the largest resource unit (RU) within the corresponding bandwidth. For example, within the 20 MHz bandwidth in 802.11be (see Tables 7 and 8), the transmitter may transmit a signal on a 242-tone RU. In another example, within the 40 MHz bandwidth in 802.11be (see Tables 9 and 10), it is considered that the transmission is performed on a 484-tone RU. This implementation is applicable to a strategy where the subcarrier spacing of a low-frequency band signal is widened to obtain a high-frequency band signal while the number of pilots remains unchanged, and is also applicable to a strategy where the subcarrier spacing of a low-frequency band signal is widened to obtain a high-frequency band signal and the number of pilots is increased, for example, in Examples 1 to 7 shown above.

[0177] In another possible implementation, the transmitter may transmit a PPDU to one receiver in a plurality of small RUs (i.e., transmit a signal to one user in a plurality of small RUs). That is, the transmitter may replace transmitting one largest RU in the above-described implementation with transmitting a plurality of small RUs. For example, in a 20 MHz bandwidth, a 242-tone RU may not be transmitted, and the number of pilot subcarriers is 8. And, 9 26-tone RUs are transmitted, and the number of pilot subcarriers is 18. Or, 4 52-tone RUs and 1 26-tone RU are transmitted, and the number of pilot subcarriers is 18. Or, 2 106-tone RUs and 1 26-tone RU are transmitted, and the number of pilot subcarriers is 10. Since the total number of pilots in a plurality of small RUs is more than the number of pilots in the largest RU, in this implementation, the number of pilot subcarriers can also be increased.

[0178] When the bandwidth is 160 MHz or 80 MHz + 80 MHz, it can be understood that the entire bandwidth can be considered as two replicas of the 80 MHz sub - carrier distribution. The entire bandwidth may include a total of 2 * 996 - tone RUs, or may include various combinations of 26 - tone RUs, 52 - tone RUs, 106 - tone RUs, 242 - tone RUs, 484 - tone RUs, and 996 - tone RUs. When the bandwidth is 320 MHz or 160 MHz + 160 MHz, the entire bandwidth can be considered as four replicas of the 80 MHz sub - carrier distribution. Combinations of multiple small RUs in 160 MHz or 320 MHz bandwidths are not enumerated one by one herein. Examples 1 to 7 shown above do not show changes to pilot sub - carriers in 160 MHz and 320 MHz bandwidths of low - frequency band signals. Of course, the first pilot sub - carrier, the first guard sub - carrier, etc. can be designed based on 160 MHz or 80 MHz + 80 MHz as an alternative. Details are not described in the embodiments of this application.

[0179] The following describes a communication device provided in an embodiment of this application.

[0180] In this application, the communication device is divided into functional modules based on the embodiments of the above - mentioned method. For example, each functional module may be obtained through division based on its corresponding function, or two or more functions may be integrated into one processing module. The integrated module may be implemented in the form of hardware or in the form of a software functional module. It should be noted that in this application, module division is an example and is only a logical function division. In an actual implementation form, another division method may be used. The following describes the communication device in the embodiments of this application in detail with reference to FIGS. 5 to 7.

[0181] FIG. 5 is a diagram of the structure of a communication device according to an embodiment of this application. As shown in FIG. 5, the communication device includes a processing unit 501 and a transceiver unit 502.

[0182] In some embodiments of the present application, the communication device may be the transmission end or chip shown above, and the chip may be disposed at the transmission end. In other words, the communication device may be configured to perform steps, functions, etc. implemented by the transmission end in the method embodiments.

[0183] The processing unit 501 is configured to generate a PPDU, and the transceiver unit 502 is configured to output the PPDU.

[0184] It can be understood that the specific descriptions of the transceiver unit and the processing unit described in the embodiments of the present application are merely examples. For the specific functions of the transceiver unit and the processing unit, the steps implemented, etc., please refer to the method embodiments described above. Details are not described here. For example, the processing unit 501 may be configured to perform step 201 shown in FIG. 2. The transceiver unit 502 may be configured to perform the transmission step in step 202 shown in FIG. 2.

[0185] FIG. 5 is reused. In some other embodiments of the present application, the communication device may be the receiving end or chip shown above, and the chip may be disposed at the receiving end. In other words, the communication device may be configured to perform steps, functions, etc. implemented by the receiving end in the method embodiments.

[0186] For example, the transceiver unit 502 is configured to input a PPDU, and the processing unit 501 is configured to process the PPDU.

[0187] For example, the processing unit 501 is specifically configured to obtain a pilot signal in a PPDU on a first pilot subcarrier corresponding to an index value based on the index value of the first pilot subcarrier, and perform processing based on the pilot signal. In another example, the processing unit 501 may be configured to perform at least one of performing phase offset estimation and / or compensation based on the pilot signal, and performing frequency offset estimation and / or compensation based on the pilot signal.

[0188] It can be understood that the specific descriptions of the transceiver unit and the processing unit described in the embodiments of the present application are merely examples. For the specific functions of the transceiver unit and the processing unit, the steps to be performed, etc., please refer to the embodiments of the above method. Details are not described here. For example, the transceiver unit 502 may be further configured to perform the receiving step in step 202 shown in FIG. 2. The processing unit 501 may be further configured to perform step 203 shown in FIG. 2.

[0189] In the above embodiments of the present application, for the descriptions of the PPDU, the first pilot subcarrier, the second pilot subcarrier, the first guard subcarrier, the second guard subcarrier, the first data subcarrier, the second data subcarrier, etc., please refer to the descriptions of the embodiments of the above method. Details are not described again here.

[0190] It can be understood that the above splitting method is only an example. The splitting methods of the transmitting end (or the chip arranged at the transmitting end) and the receiving end (or the chip arranged at the receiving end) can be further shown as follows. The transmitting end may include a generating unit and a transmitting unit. The receiving end may include a receiving unit and a processing unit. The processing unit may include at least one of a pilot sub-unit, a channel estimation sub-unit, and a time synchronization sub-unit, etc. Details are not enumerated one by one here. Optionally, each of the transmitting end and the receiving end shown above may further include a storage unit, and the storage unit may be configured to store the index value shown above. Alternatively, the storage unit may be configured to store at least one of the index value of the first pilot sub-carrier, the index value of the first guard sub-carrier, and the index value of the first data sub-carrier.

[0191] The above describes the first communication device and the second communication device in the embodiments of the present application. The following describes possible product forms of the first communication device and the second communication device. It should be understood that any form of product having the functions of the first communication device in FIG. 5, or any form of product having the functions of the second communication device in FIG. 5, is within the protection scope of the embodiments of the present application. It should be further understood that the following description is only an example, and the product forms of the first communication device and the second communication device in the embodiments of the present application are not limited thereto.

[0192] In one possible implementation, in the communication device shown in FIG. 5, the processing unit 501 can be one or more processors. The transceiver unit 502 may be a transceiver, or the transceiver unit 502 may be a transmission unit and a reception unit. The transmission unit may be a transmitter, and the reception unit may be a receiver. The transmission unit and the reception unit are integrated into one device, such as a transceiver. In this embodiment of the present application, the processor and the transceiver may be combined or the like. The manner of connecting the processor and the transceiver is not limited in the embodiments of the present application.

[0193] As shown in FIG. 6, the communication device 60 includes one or more processors 620 and a transceiver 610.

[0194] For example, when the communication device is configured to implement the steps, methods, or functions realized by a transmission end, the processor 620 is configured to generate a PPDU, and the transceiver 610 is configured to transmit the PPDU.

[0195] For example, when the communication device is configured to implement the steps, methods, or functions realized by a reception end, the transceiver 610 is configured to receive a PPDU from the transmission end, and the processor 620 is configured to perform processing based on M sequences carried in the PPDU.

[0196] In this embodiment of the present application, for the descriptions of PPDU, the first pilot subcarrier, the second pilot subcarrier, the first guard subcarrier, the second guard subcarrier, the first data subcarrier, the second data subcarrier, etc., please refer to the description of the embodiments of the above method. Details are not described again here.

[0197] For a specific description of the processor and the transceiver, it can be understood that reference may be made to the description of the processing unit and the transceiver unit shown in FIG. 5. Details will not be described again here.

[0198] In each implementation form of the communication device shown in FIG. 6, the transceiver may include a receiver and a transmitter. The receiver is configured to realize a receiving function (or operation), and the transmitter is configured to realize a transmitting function (or operation). In addition, the transceiver is configured to communicate with another device / equipment through a transmission medium.

[0199] Optionally, the communication device 60 may further include one or more memories 630 configured to store program instructions, data, etc. The memory 630 is coupled to the processor 620. The coupling in the embodiments of the present application is an indirect coupling or communication connection between devices, units, or modules, and may be in an electronic form, a mechanical form, or another form, and is used for information exchange between devices, units, or modules. The processor 620 may cooperate with the memory 630. The processor 620 may execute the program instructions stored in the memory 630. Optionally, at least one of the one or more memories may be included in the processor. For example, the memory may be configured to store each index value shown above. For example, the memory may be configured to store at least one of the index value of the first pilot subcarrier, the index value of the first guard subcarrier, and the index value of the first data subcarrier.

[0200] The specific connection medium between the transceiver 610, the processor 620, and the memory 630 is not limited in the embodiments of this application. In this embodiment of this application, in FIG. 6, the memory 630, the processor 620, and the transceiver 610 are connected to each other through a bus 640. The bus is represented using the thick line in FIG. 6. The connection manners between other components are only described as examples and are not limited thereto. The bus can be classified into an address bus, a data bus, a control bus, etc. For the sake of simplicity of expression, only one thick line is used to represent the bus in FIG. 6, but this does not mean that there is only one bus or one type of bus.

[0201] In this embodiment of this application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit, a field programmable gate array or another programmable logic device, discrete gates or transistor logic devices, discrete hardware components, etc., and may implement or realize the methods, steps, and logical block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor, any conventional processor, etc. The steps of the methods disclosed in connection with the embodiments of this application may be directly implemented and achieved by a hardware processor, or may be implemented and achieved by using a combination of hardware modules and software modules in the processor.

[0202] In this embodiment of the present application, the memory may include, but is not limited to, non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), random access memory (RAM), erasable programmable read-only memory (EPROM), read-only memory (ROM), or compact disc read-only memory (CD-ROM). The memory is any storage medium (e.g., the communication device described in the present application) that can be used to carry or store program code in the form of instructions or data structures and can be read and / or written by a computer, but is not limited thereto. The memory in this embodiment of the present application may alternatively be a circuit or any other device capable of implementing a storage function and configured to store program instructions and / or data.

[0203] For example, the processor 620 is mainly configured to process communication protocols and communication data, control the entire communication device, execute software programs, and process data of software programs. The memory 630 is mainly configured to store software programs and data. The transceiver 610 may include a control circuit and an antenna. The control circuit is mainly configured to perform conversion between a baseband signal and a radio frequency signal and process the radio frequency signal. The antenna is mainly configured to receive or transmit a radio frequency signal in the form of an electromagnetic wave. An input / output device, such as a touch screen, a display, or a keyboard, is mainly configured to receive data input by a user and output data to the user.

[0204] After the communication device is powered on, the processor 620 can read a software program in the memory 630, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be transmitted wirelessly, the processor 620 performs baseband processing on the data to be transmitted and then outputs the baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal and then transmits the radio frequency signal in the form of electromagnetic waves through the antenna. When data is transmitted to the communication device, the radio frequency circuit receives the radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 620. The processor 620 converts the baseband signal into data and processes the data.

[0205] In another implementation, the radio frequency circuit and the antenna can be arranged independently of the processor that performs baseband processing. For example, in a distributed scenario, the radio frequency circuit and the antenna can be remotely arranged independently of the communication device.

[0206] It can be understood that the communication device shown in this embodiment of the present application may further have a larger number of components and the like than those in FIG. 6. This is not limited in this embodiment of the present application. The methods implemented by the processor and the transceiver are only examples. For the specific steps implemented by the processor and the transceiver, please refer to the methods described above.

[0207] In another possible implementation, in the communication device shown in FIG. 5, the processing unit 501 may be one or more logic circuits, and the transceiver unit 502 may be an input / output interface, which may also be referred to as a communication interface, an interface circuit, an interface, etc. Alternatively, the transceiver unit 502 may be a transmission unit and a reception unit. The transmission unit may be an output interface, and the reception unit may be an input interface. Alternatively, the transmission unit and the reception unit may be integrated into one unit, for example, an input / output interface. As shown in FIG. 7, a communication device as shown in FIG. 7 includes a logic circuit 701 and an interface 702. In other words, the processing unit 501 may be implemented through the logic circuit 701, and the transceiver unit 502 may be implemented through the interface 702. The logic circuit 701 may be a chip, a processing circuit, an integrated circuit, a system on chip (SoC), etc. The interface 702 may be a communication interface, an input / output interface, a pin, etc. For example, FIG. 7 is an example where the communication device is a chip. The chip includes a logic circuit 701 and an interface 702.

[0208] In this embodiment of the present application, the logic circuit and the interface may be coupled to each other. The specific manner of connection between the logic circuit and the interface is not limited in the embodiments of the present application.

[0209] For example, when the communication device is configured to implement a method, function, or step realized by a transmission end, the logic circuit 701 is configured to generate a PPDU. The interface 702 is configured to output the PPDU.

[0210] For example, when the communication device is configured to implement a method, function, or step realized by a reception end, the interface 702 is configured to input a PPDU, and the logic circuit 701 is configured to process the PPDU.

[0211] Optionally, the chip may further include a memory, and the memory may be configured to store each index value shown above. For example, the memory may be configured to store at least one of the index value of the first pilot subcarrier, the index value of the first data subcarrier, and the index value of the first guard subcarrier. Of course, the memory may alternatively be disposed outside the chip. For example, the chip may obtain the index value from a memory connected to the chip.

[0212] It can be understood that the communication device described in the embodiments of the present application may implement the method provided in the embodiments of the present application in the form of hardware, or may implement the method provided in the embodiments of the present application in the form of software. This is not limited in the embodiments of the present application.

[0213] For the descriptions of the PPDU, the first pilot subcarrier, the second pilot subcarrier, the first guard subcarrier, the second guard subcarrier, the first data subcarrier, the second data subcarrier, etc. in this embodiment of the present application, please refer to the description of the embodiments of the above method. Details will not be described again here.

[0214] For the specific implementation form of the embodiment shown in FIG. 7, please refer to the above embodiments. Details will not be described again here.

[0215] Certain embodiments of the present application further provide a wireless communication system. The wireless communication system includes a transmitting end and a receiving end. The transmitting end and the receiving end may be configured to implement the method in any embodiment (for example, FIG. 2).

[0216] In addition, the present application further provides a computer program. The computer program is used to implement the operations and / or processes performed by the transmitting end in the method provided in the present application.

[0217] This application further provides a computer program. The computer program is used to perform the operations and / or processes implemented by the receiving end in the method provided by this application.

[0218] This application further provides a computer-readable storage medium. The computer-readable storage medium stores computer code. When the computer code is executed on a computer, the computer is enabled to perform the operations and / or processes implemented by the sending end in the method provided by this application.

[0219] This application further provides a computer-readable storage medium. The computer-readable storage medium stores computer code. When the computer code is executed on a computer, the computer is enabled to perform the operations and / or processes implemented by the receiving end in the method provided by this application.

[0220] This application further provides a computer program product. The computer program product includes computer code or a computer program. When the computer code or the computer program is executed on a computer, the operations and / or processes implemented by the sending end in the method provided by this application are performed.

[0221] This application further provides a computer program product. The computer program product includes computer code or a computer program. When the computer code or the computer program is executed on a computer, the operations and / or processes implemented by the receiving end in the method provided by this application are performed.

[0222] In some embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other ways. For example, the described embodiments of the devices are merely examples. For example, the division into units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not implemented. In addition, the couplings, direct couplings, or communication connections shown or discussed may be implemented through some interface, indirect coupling, or communication connection, electrical connection, mechanical connection, or other forms of connection between devices or units.

[0223] The units described as separate parts may or may not be physically separate, and the parts shown as units may or may not be physical units. They may be located in one position or distributed among multiple network units. To achieve the technical effects of the solutions provided in the embodiments of this application, some or all of the units may be selected based on actual requirements.

[0224] In addition, the functional units in the embodiments of this application may be integrated into one processing unit, each unit may physically exist alone, or two or more units may be integrated into one unit. The integrated unit may be implemented in the form of hardware or in the form of a software functional unit.

[0225] When the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, the integrated unit can be stored in a computer-readable storage medium. Based on such an understanding, the technical solution of this application basically, or the part that contributes to the prior art, or all or part of the technical solution can be implemented in the form of a software product. The computer software product is stored in a readable storage medium and contains a plurality of instructions for instructing a computer device (which can be a personal computer, a server, or a network device) to implement all or part of the steps of the method described in the embodiments of this application. The readable storage medium includes any medium that can store program code, such as a USB flash drive, a removable hard disk drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0226] The above description is only a specific implementation form of this application and is not intended to limit the protection scope of this application. Any deformation or substitution that is easily understood by those skilled in the art within the technical scope disclosed in this application shall be within the protection scope of this application. Therefore, the protection scope of this application is determined by the protection scope of the claims.

Description of Reference Signs

[0227] 60 Communication device 501 Processing unit 502 Transceiver unit 610 Transceiver 620 Processor 630 Memory 640 Bus 701 Logic circuit 702 Interface

Claims

1. A communication method based on a physical layer protocol data unit (PPDU), comprising: generating the PPDU; and transmitting the PPDU on a first high-frequency channel, wherein the first high-frequency channel includes a first pilot subcarrier and a first data subcarrier, a discrete Fourier transform (DFT) size corresponding to the first high-frequency channel is the same as a DFT size corresponding to a first low-frequency channel, a quantity of the first pilot subcarriers is greater than a quantity of second pilot subcarriers in the first low-frequency channel, and a quantity of the first data subcarriers is equal to a quantity of second data subcarriers in the first low-frequency channel.

2. A communication method based on a physical layer protocol data unit (PPDU), comprising: receiving the PPDU on a first high-frequency channel, wherein the first high-frequency channel includes a first pilot subcarrier and a first data subcarrier, a discrete Fourier transform (DFT) size corresponding to the first high-frequency channel is the same as a DFT size corresponding to a first low-frequency channel, a quantity of the first pilot subcarriers is greater than a quantity of second pilot subcarriers in the first low-frequency channel, and a quantity of the first data subcarriers is equal to a quantity of second data subcarriers in the first low-frequency channel; and processing the PPDU.

3. The step of processing the PPDU includes: acquiring a pilot signal in the PPDU in the first pilot subcarrier corresponding to the index value based on an index value of the first pilot subcarrier; and executing processing based on the pilot signal, according to the method of Claim 2.

4. The step of executing processing based on the pilot signal includes: executing phase offset estimation and / or compensation based on the pilot signal, and executing frequency offset estimation and / or compensation based on the pilot signal including at least one of them, according to the method of Claim 3.

5. The method according to any one of claims 1 to 4, wherein the first pilot subcarrier is obtained by mapping a second pilot subcarrier and a second guard subcarrier in the first low-frequency channel to the first high-frequency channel.

6. The method according to claim 5, wherein the index value of the first pilot subcarrier includes at least one of the index value of the second guard subcarrier and the index value of the second pilot subcarrier.

7. The index value of the first pilot subcarrier is [-29, -21, -7, 7, 21]、 [-29, -21, -7, 7, 21, 29]、 [-30, -29, -21, -7, 7, 21, 29]、 [-30, -29, -21, -7, 7, 21, 29, 30]、 [-31, -30, -29, -21, -7, 7, 21, 29, 30]、 [-31, -30, -29, -21, -7, 7, 21, 29, 30, 31], and includes at least one of [-32, -31, -30, -29, -21, -7, 7, 21, 29, 30, 31], [-21, -7, 7, 21] is the same as the index value of the second pilot subcarrier, and [-32, -31, -30, -29, 29, 30, 31] is the same as the index value of the second guard subcarrier. The method according to any one of claims 1 to 6.

8. The index value of the first pilot subcarrier is [-59, -53, -25, -11, 11, 25, 53]、 [-59, -53, -25, -11, 11, 25, 53, 59]、 [-60, -59, -53, -25, -11, 11, 25, 53, 59]、 [-60, -59, -53, -25, -11, 11, 25, 53, 59, 60]、 [-61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60]、 [-61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61]、 [-62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61]、 [-62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62]、 [-63, -62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62]、 [-63, -62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62, 63], and includes at least one of [-64, -63, -62, -61, -60, -59, -53, -25, -11, 11, 25, 53, 59, 60, 61, 62, 63], [-53, -25, -11, 11, 25, 53] is the same as the index value of the second pilot subcarrier, and [-64, -63, -62, -61, -60, -59, 59, 60, 61, 62, 63] is the same as the index value of the second guard subcarrier. The method according to any one of claims 1 to 6.

9. The index value of the first pilot subcarrier is [-123, -103, -75, -39, -11, 11, 39, 75, 103]、 [-123, -103, -75, -39, -11, 11, 39, 75, 103, 123]、 [-124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123]、 [-124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124]、 [-125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124]、 [-125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125]、 [-126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125]、 [-126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126]、 [-127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126]、 [-127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126, 127], and including at least one of [-128, -127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126, 127], wherein [-103, -75, -39, -11, 11, 39, 75, 103] is the same as the index value of the second pilot subcarrier, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] is the same as the index value of the second guard subcarrier, the method according to any one of claims 1 to 6.

10. The index value of the first pilot subcarrier is [-123, -116, -90, -48, -22, 22, 48, 90, 116]、 [-123, -116, -90, -48, -22, 22, 48, 90, 116, 123]、 [-124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123]、 [-124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124]、 [-125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124]、 [-125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125]、 [-126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125]、 [-126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126]、 [-127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126]、 [-127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126, 127], and including at least one of [-128, -127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126, 127], wherein [-116, -90, -45, -22, 22, 48, 90, 116] is the same as the index value of the second pilot subcarrier, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] is the same as the index value of the second guard subcarrier, the method according to any one of claims 1 to 6.

11. The index value of the first pilot subcarrier is [-245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245]、 [-246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246]、 [-247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247]、 [-248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248]、 [-249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249]、 [-250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250]、 [-251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251]、 [-252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252]、 [-253, -252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252, 253]、 [-254, -253, -252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254], and including at least one of [-255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255], [-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238] is the same as the index value of the second pilot subcarrier, and [-256, -255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255] is the same as the index value of the second guard subcarrier, the method according to any one of claims 1 to 6.

12. The index value of the first pilot subcarrier is [-501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501]、 [-502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502]、 [-503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503]、 [-504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504]、 [-505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505]、 [-506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506]、 [-507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507]、 [-508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508]、 [-509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509]、 [-510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510], and including at least one of [-511, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511], [-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468] is the same as the index value of the second pilot sub-carrier, and [-512, -511, -510, -519, -518, -517, -516, -515, -514, -513, -512, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511] is the same as the index value of the second guard sub-carrier, the method according to any one of claims 1 to 6.

13. The index value of the first pilot sub-carrier is [-501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501]、 [-502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502]、 [-503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503]、 [-504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504]、 [-505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505]、 [-506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506]、 [-507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507]、 [-508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508]、 [-509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509]、 [-510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510], and includes at least one of [-511, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511], [-468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468] is the same as the index value of the second pilot subcarrier, and [-512, -511, -510, -519, -518, -517, -516, -515, -514, -513, -512, -510, -509, -508, -507, -506, -505, -504, -503, -502, -501, 501, 502, 503, 504, 505, 506, 507, 508, 509, 510, 511] is the same as the index value of the second guard subcarrier. The method according to any one of claims 1 to 6.

14. The first pilot subcarrier is obtained by mapping a second data subcarrier in the first low-frequency channel to the first high-frequency channel, or the first pilot subcarrier is obtained by mapping the second pilot subcarrier and the second data subcarrier to the first high-frequency channel. The method according to any one of claims 1 to 4.

15. The index value of the first pilot subcarrier is [-25, -15, -5, 5, 15]、 [-25, -15, -5, 5, 15, 25]、 [-28, -20, -12, -4, 4, 12, 20]、 [-28, -20, -12, -4, 4, 12, 20, 28]、 [-27, -21, -15, -9, -3, 3, 9, 15, 21]、 [-27, -21, -15, -9, -3, 3, 9, 15, 21, 27], and includes at least one of [-28, -23, -18, -13, -8, -3, 3, 8, 13, 18, 23], or The index value of the first pilot subcarrier is [-49, -35, -21, -7, 7, 21, 35]、 [-49, -35, -21, -7, 7, 21, 35, 49]、 [-54, -42, -30, -18, -6, 6 18, 30, 42]、 [-54, -42, -30, -18, -6, 6 18, 30, 42, 54]、 [-55, -45, -35, -25, -15, -5, 5, 15, 25, 35, 45]、 [-55, -45, -35, -25, -15, -5, 5, 15, 25, 35, 45, 55]、 [-52, -44, -36, -28, -20, -12, -4, 4, 12, 20, 28, 36, 44]、 [-52, -44, -36, -28, -20, -12, -4, 4, 12, 20, 28, 36, 44, 52]、 [-53, -46, -39, -32, -25, -18, -11, -4, 4, 11, 18, 25, 32, 39, 46]、 [-53, -46, -39, -32, -25, -18, -11, -4, 4, 11, 18, 25, 32, 39, 46, 53], and includes at least one of [-58, -52, -46, -40, -34, -28, -22, -16, -10, -4, 4, 10, 16, 22, 28, 34, 40, 46, 52], or The index value of the first pilot subcarrier is [-108, -84, -60, -36, -12, 12, 36, 60, 84]、 [-108, -84, -60, -36, -12, 12, 36, 60, 84, 108]、 [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90]、 [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110]、 [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99]、 [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117]、 [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98]、 [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113]、 [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98]、 [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 113], and including at least one of [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102], or the index value of the first pilot subcarrier is [-108, -84, -60, -36, -12, 12, 36, 60, 84]、 [-108, -84, -60, -36, -12, 12, 36, 60, 84, 108]、 [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90]、 [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110]、 [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99]、 [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117]、 [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98]、 [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113]、 [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98]、 [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 113], and including at least one of [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102], or the index value of the first pilot subcarrier is [-229, -202, -175, -148, -121, -94, -67, -40, -13, 13, 40, 67, 94, 121, 148, 175, 202, 229]、 [-228, -204, -180, -156, -132, -108, -84, -60, -36, -12, 12, 36, 60, 84, 108, 132, 156, 180, 204, 228]、 [-231, -209, -187, -165, -143, -121, -99, -77, -55, -33, -11, 11, 33, 55, 77, 99, 121, 143, 165, 187, 209, 231]、 [-230, -210, -190, -170, -150, -130, -110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110, 130, 150, 170, 190, 210, 230]、 [-225, -207, -189, -171, -153, -135, -117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117, 135, 153, 171, 189, 207, 225]、 [-230, -213, -196, -179, -162, -145, -128, -111, -94, -77, -60, -43, -26, -9, 9, 26, 43, 60, 77, 94, 111, 128, 145, 162, 179, 196, 213, 230]、 [-232, -216, -200, -184, -168, -152, -136, -120, -104, -88, -72, -56, -40, -24, -8, 8, 24, 40, 56, 72, 88, 104, 120, 136, 152, 168, 184, 200, 216, 232]、 [-233, -218, -203, -188, -173, -158, -143, -128, -113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113, 128, 143, 158, 173, 188, 203, 218, 233]、 [-231, -217, -203, -189, -175, -161, -147, -133, -119, -105, -91, -77, -63, -49, -35, -21, -7, 7, 21, 35, 49, 63, 77, 91, 105, 119, 133, 147, 161, 175, 189, 203, 217, 231]、 [-228, -215, -202, -189, -176, -163, -150, -137, -124, -111, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 111, 124, 137, 150, 163, 176, 189, 202, 215, 228], and including at least one of [-222, -210, -198, -186, -174, -162, -150, -138, -126, -114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102, 114, 126, 138, 150, 162, 174, 186, 198, 210, 222], or the index value of the first pilot subcarrier is [-476, -420, -364, -308, -252, -196, -140, -84, -28, 28, 84, 140, 196, 252, 308, 364, 420, 476]、 [-475, -425, -375, -325, -275, -225, -175, -125, -75, -25, 25, 75, 125, 175, 225, 275, 325, 375, 425, 475]、 [-462, -418, -374, -330, -286, -242, -198, -154, -110, -66, -22, 22, 66, 110, 154, 198, 242, 286, 330, 374, 418, 462]、 [-483, -441, -399, -357, -315, -273, -231, -189, -147, -105, -63, -21, 21, 63, 105, 147, 189, 231, 273, 315, 357, 399, 441, 483]、 [-475, -437, -399, -361, -323, -285, -247, -209, -171, -133, -95, -57, -19, 19, 57, 95, 133, 171, 209, 247, 285, 323, 361, 399, 437, 475]、 [-486, -450, -414, -378, -342, -306, -270, -234, -198, -162, -126, -90, -54, -18, 18, 54, 90, 126, 162, 198, 234, 270, 306, 342, 378, 414, 450, 486]、 [-478, -445, -412, -379, -346, -313, -280, -247, -214, -181, -148, -115, -82, -49, -16, 16, 49, 82, 115, 148, 181, 214, 247, 280, 313, 346, 379, 412, 445, 478]、 [-480, -449, -418, -387, -356, -325, -294, -263, -232, -201, -170, -139, -108, -77, -46, -15, 15, 46, 77, 108, 139, 170, 201, 232, 263, 294, 325, 356, 387, 418, 449, 480]、 [-495, -465, -435, -405, -375, -345, -315, -285, -255, -225, -195, -165, -135, -105, -75, -45, -15, 15, 45, 75, 105, 135, 165, 195, 225, 255, 285, 315, 345, 375, 405, 435, 465, 495]、 [-490, -462, -434, -406, -378, -350, -322, -294, -266, -238, -210, -182, -154, -126, -98, -70, -42, -14, 14, 42, 70, 98, 126, 154, 182, 210, 238, 266, 294, 322, 350, 378, 406, 434, 462, 490], and including at least one of [-481, -455, -429, -403, -377, -351, -325, -299, -273, -247, -221, -195, -169, -143, -117, -91, -65, -39, -13, 13, 39, 65, 91, 117, 143, 169, 195, 221, 247, 273, 299, 325, 351, 377, 403, 429, 455, 481], or the index value of the first pilot subcarrier is [-476, -420, -364, -308, -252, -196, -140, -84, -28, 28, 84, 140, 196, 252, 308, 364, 420, 476]、 [-475, -425, -375, -325, -275, -225, -175, -125, -75, -25, 25, 75, 125, 175, 225, 275, 325, 375, 425, 475]、 [-462, -418, -374, -330, -286, -242, -198, -154, -110, -66, -22, 22, 66, 110, 154, 198, 242, 286, 330, 374, 418, 462]、 [-483, -441, -399, -357, -315, -273, -231, -189, -147, -105, -63, -21, 21, 63, 105, 147, 189, 231, 273, 315, 357, 399, 441, 483]、 [-475, -437, -399, -361, -323, -285, -247, -209, -171, -133, -95, -57, -19, 19, 57, 95, 133, 171, 209, 247, 285, 323, 361, 399, 437, 475]、 [-486, -450, -414, -378, -342, -306, -270, -234, -198, -162, -126, -90, -54, -18, 18, 54, 90, 126, 162, 198, 234, 270, 306, 342, 378, 414, 450, 486]、 [-478, -445, -412, -379, -346, -313, -280, -247, -214, -181, -148, -115, -82, -49, -16, 16, 49, 82, 115, 148, 181, 214, 247, 280, 313, 346, 379, 412, 445, 478]、 [-480, -449, -418, -387, -356, -325, -294, -263, -232, -201, -170, -139, -108, -77, -46, -15, 15, 46, 77, 108, 139, 170, 201, 232, 263, 294, 325, 356, 387, 418, 449, 480]、 [-495, -465, -435, -405, -375, -345, -315, -285, -255, -225, -195, -165, -135, -105, -75, -45, -15, 15, 45, 75, 105, 135, 165, 195, 225, 255, 285, 315, 345, 375, 405, 435, 465, 495]、 [-490, -462, -434, -406, -378, -350, -322, -294, -266, -238, -210, -182, -154, -126, -98, -70, -42, -14, 14, 42, 70, 98, 126, 154, 182, 210, 238, 266, 294, 322, 350, 378, 406, 434, 462, 490], and the method according to claim 14, including at least one of [-481, -455, -429, -403, -377, -351, -325, -299, -273, -247, -221, -195, -169, -143, -117, -91, -65, -39, -13, 13, 39, 65, 91, 117, 143, 169, 195, 221, 247, 273, 299, 325, 351, 377, 403, 429, 455, 481].

16. the bandwidth of the first low-frequency channel includes at least one of 20 MHz, 40 MHz, and 80 MHz, the method according to any one of claims 1 to 15, wherein the bandwidth of the first high-frequency channel includes at least one of 270 MHz, 320 MHz, 540 MHz, 1080 MHz, 2160 MHz, 4320 MHz, and 8640 MHz.

17. A communication device, a processing unit configured to generate a physical layer protocol data unit (PPDU), A transceiver unit configured to transmit the PPDU in a first high-frequency channel, wherein the first high-frequency channel includes a first pilot subcarrier and a first data subcarrier, a discrete Fourier transform (DFT) size corresponding to the first high-frequency channel is the same as a DFT size corresponding to a first low-frequency channel, a quantity of the first pilot subcarriers is greater than a quantity of second pilot subcarriers in the first low-frequency channel, and a quantity of the first data subcarriers is equal to a quantity of second data subcarriers in the first low-frequency channel, and the apparatus includes the transceiver unit.

18. A communication device, A transceiver unit configured to receive the PPDU in a first high-frequency channel, wherein the first high-frequency channel includes a first pilot subcarrier and a first data subcarrier, a discrete Fourier transform (DFT) size corresponding to the first high-frequency channel is the same as a DFT size corresponding to a first low-frequency channel, a quantity of the first pilot subcarriers is greater than a quantity of second pilot subcarriers in the first low-frequency channel, and a quantity of the first data subcarriers is equal to a quantity of second data subcarriers in the first low-frequency channel, and the apparatus includes the transceiver unit and A processing unit configured to process the PPDU.

19. The apparatus according to claim 18, wherein the processing unit is specifically configured to obtain a pilot signal in the PPDU in the first pilot subcarrier corresponding to the index value based on an index value of the first pilot subcarrier and execute processing based on the pilot signal.

20. Specifically, the processing unit executes phase offset estimation and / or compensation based on the pilot signal, and is configured to execute frequency offset estimation and / or compensation based on the pilot signal. The apparatus according to claim 19.

21. A communication device including a processor and a memory, wherein the memory is configured to store instructions, and the processor is configured to execute the instructions to execute the method according to any one of claims 1 to 16.

22. A communication device comprising a logic circuit and an interface, wherein the logic circuit is coupled to the interface, the interface is configured to input and / or output code instructions, and the logic circuit is configured to execute the code instructions to execute the method according to any one of claims 1 to 16. A communication device.

23. A computer-readable storage medium configured to store a computer program, wherein when the computer program is executed, the method according to any one of claims 1 to 16 is executed. A computer-readable storage medium.

24. A computer program, wherein when the computer program is executed, the method according to any one of claims 1 to 16 is executed. A computer program.

25. A communication system comprising a transmitting end and a receiving end, wherein the transmitting end is configured to execute the method according to any one of claims 1 and 5 to 16, and the receiving end is configured to execute the method according to any one of claims 2 to 16. A communication system.

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