Method and apparatus for communicating based on physical layer protocol data units

Abstract

A PPDU-based communication method and device are applied to a wireless local area network system supporting IEEE 802.11ax next-generation Wi-Fi protocol, such as 802.11be, Wi-Fi 7 or EHT, or 802.11 series protocol such as 802.11be next-generation, Wi-Fi 8, and can also be applied to a wireless personal area network system based on UWB, a sensing system and the like. A sending end generates a PPDU and sends the PPDU on a first high-frequency channel; correspondingly, a receiving end receives the PPDU on the first high-frequency channel and processes the PPDU. The first high-frequency channel can include first pilot subcarriers and first data subcarriers, and the number of the first pilot subcarriers is greater than the number of second pilot subcarriers, and the number of the first data subcarriers is equal to the number of second data subcarriers. The accuracy of demodulation of the receiving end can be effectively improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of communication, and in particular to a communication method and device based on a physical layer (physical, PHY) protocol data unit (PPDU). BACKGROUND

[0002] Wireless local area network (WLAN) starts from 802.11a / g, goes through 802.11n, 802.11ac, 802.11ax, 802.11be, and so on, uses frequency bands from 2.4G to 2.4G / 5G, and then to 2.4G / 5G / 6G, supports bandwidths from 20MHz to 320MHz, and its spectrum efficiency and throughput are constantly improving. The next generation of WLAN technology will further improve its physical layer capabilities and introduce 45G / 60G and other millimeter wave frequency bands.

[0003] A method for transmitting a high-frequency signal can be as follows: directly transmitting a high-frequency signal obtained by expanding the subcarrier spacing of a low-frequency signal, that is, the number of pilot subcarriers used by the high-frequency signal is equal to the number of pilot subcarriers used by the low-frequency signal, and the positions of the pilot subcarriers used by the high-frequency signal correspond to the positions of the pilot subcarriers used by the low-frequency signal; the number of guard subcarriers used by the high-frequency signal is equal to the number of guard subcarriers of the low-frequency signal, and the positions of the guard subcarriers used by the high-frequency signal correspond to the positions of the guard subcarriers used by the low-frequency signal. Thus, the digital signal processing processes of the high-frequency signal and the low-frequency signal are close to being consistent, which is more friendly to chip design and implementation for the next generation of WLAN protocols that support both high and low frequencies. The above-mentioned low-frequency signal can be understood as a signal involved in low-frequency protocols such as 802.11n, 802.11ac, 802.11ax, 802.11be, and the like.

[0004] The accuracy of demodulation at the receiving end in the above method needs to be improved. SUMMARY

[0005] The present application provides a communication method and device based on PPDU, which can effectively improve the accuracy of demodulation at the receiving end.

[0006] In a first aspect, an embodiment of the present application provides a PPDU-based communication method, which is applied to a sending end or a chip, and the chip is applied to the sending end. The method comprises: generating the PPDU; and sending the PPDU on a first high-frequency channel, wherein the first high-frequency channel comprises first pilot subcarriers and first data subcarriers, 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, and a number of the first pilot subcarriers is greater than a number of second pilot subcarriers in the first low-frequency channel, and a number of the first data subcarriers is equal to a number of second data subcarriers in the first low-frequency channel.

[0007] In a second aspect, an embodiment of the present application provides a PPDU-based communication method, which is applied to a receiving end or a chip, and the chip is applied to the receiving end. The method comprises: receiving the PPDU on a first high-frequency channel, wherein the first high-frequency channel comprises first pilot subcarriers and first data subcarriers, a DFT size corresponding to the first high-frequency channel is the same as a DFT size corresponding to a first low-frequency channel, a number of the first pilot subcarriers is greater than a number of second pilot subcarriers in the first low-frequency channel, and a number of the first data subcarriers is equal to a number of second data subcarriers in the first low-frequency channel; and processing the PPDU.

[0008] In an embodiment of the present application, by ensuring that the number of the first pilot subcarriers is greater than the number of the second pilot subcarriers, the receiving end can have a sufficient number of pilot carriers to correct frequency offset, and the accuracy of data demodulation of the receiving end is improved. By ensuring that the number of the first data subcarriers is equal to the number of the second data subcarriers, the generation process of the PPDU of the sending end is close to being consistent, and the compatibility of the baseband chip on the low-frequency band and the high-frequency band is ensured. Compared with a scheme in which the subcarrier spacing of the low-frequency band signal is directly expanded to obtain the high-frequency band signal and the number of pilot carriers does not change, because the interference of the high-frequency band signal is greater than that of the low-frequency band signal, if the number of pilot carriers does not change, the receiving end can not have a sufficient number of pilot carriers to correct frequency offset, the estimation of the phase offset of the receiving end can be inaccurate, the phase offset accompanying the data subcarriers cannot be accurately compensated, and thus the demodulation accuracy is affected.

[0009] In combination with the second aspect, in a possible implementation manner, the processing of the PPDU comprises: based on an index value of the first pilot subcarrier, acquiring a pilot signal in the PPDU on the first pilot subcarrier corresponding to the index value; and processing based on the pilot signal.

[0010] With reference to the second aspect, in a possible implementation manner, the processing based on the pilot signal comprises at least one of the following: estimation and / or compensation of phase offset based on the pilot signal; estimation and / or compensation of frequency offset based on the pilot signal.

[0011] With reference to the first aspect and the second aspect, in a possible implementation manner, the first pilot subcarrier is obtained by mapping the second pilot subcarrier and the second guard subcarrier in the first low-frequency channel to a first high-frequency channel.

[0012] In the embodiment of the present application, the first pilot subcarrier is obtained by the second pilot subcarrier and the second guard subcarrier, which has less change compared with the protocol related to the low-frequency band.

[0013] With reference to the first aspect and the second aspect, in a possible implementation manner, the index value of the first pilot subcarrier comprises at least one of the following: the index value of the second guard subcarrier, the index value of the second pilot subcarrier.

[0014] With reference to the first aspect and the second aspect, in a possible implementation manner, the index value of the first pilot subcarrier comprises at least one of the following:

[0015] [-29, -21, -7, 7, 21];

[0016] [-29, -21, -7, 7, 21, 29];

[0017] [-30, -29, -21, -7, 7, 21, 29];

[0018] [-30, -29, -21, -7, 7, 21, 29, 30];

[0019] [-31, -30, -29, -21, -7, 7, 21, 29, 30];

[0020] [-31, -30, -29, -21, -7, 7, 21, 29, 30, 31];

[0021] [-32, -31, -30, -29, -21, -7, 7, 21, 29, 30, 31];

[0022] wherein [-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.

[0023] With reference to the first aspect and the second aspect, in a possible implementation manner, the index value of the first pilot subcarrier comprises at least one of the following:

[0024] [-59,-53,-25,-11, 11, 25, 53];

[0025] [-59,-53,-25,-11, 11, 25, 53, 59];

[0026] [-60,-59,-53,-25,-11, 11, 25, 53, 59];

[0027] [-60,-59,-53,-25,-11, 11, 25, 53, 59, 60];

[0028] [-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60];

[0029] [-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60, 61];

[0030] [-62,-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60, 61];

[0031] [-62,-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60, 61, 62];

[0032] [-63,-62,-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60, 61, 62];

[0033] [-63,-62,-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60, 61, 62, 63];

[0034] [-64,-63,-62,-61,-60,-59,-53,-25,-11, 11, 25, 53, 59, 60, 61, 62, 63];

[0035] wherein [-53,-25,-11, 11, 25, 53] is same as the index value of the second pilot subcarrier, and [-64,-63,-62,-61,-60,-59, 59, 60, 61, 62, 63] is same as the index value of the second guard subcarrier.

[0036] With reference to the first aspect and the second aspect, in a possible implementation manner, the index value of the first pilot subcarrier comprises at least one of:

[0037] [-123,-103,-75,-39,-11,11,39,75,103]；

[0038] [-123,-103,-75,-39,-11,11,39,75,103,123]；

[0039] [-124,-123,-103,-75,-39,-11,11,39,75,103,123]；

[0040] [-124,-123,-103,-75,-39,-11,11,39,75,103,123,124]；

[0041] [-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124]；

[0042] [-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124,125]；

[0043] [-126,-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124,125]；

[0044] [-126,-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124,125,126]；

[0045] [-127,-126,-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124,125,126]；

[0046] [-127,-126,-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124,125,126,127]；

[0047] [-128,-127,-126,-125,-124,-123,-103,-75,-39,-11,11,39,75,103,123,124,125,126,127]；

[0048] wherein [-103, -75, -39, -11, 11, 39, 75, 103] are the same as the index values of the second pilot subcarriers, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] are the same as the index values of the second guard subcarriers.

[0049] In combination with the first aspect and the second aspect, in a possible implementation manner, the index values of the first pilot subcarriers include at least one of the following:

[0050] [-123, -116, -90, -48, -22, 22, 48, 90, 116];

[0051] [-123, -116, -90, -48, -22, 22, 48, 90, 116, 123];

[0052] [-124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123];

[0053] [-124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124];

[0054] [-125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124];

[0055] [-125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125];

[0056] [-126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125];

[0057] [-126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126];

[0058] [-127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126];

[0059] [-127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90, 116, 123, 124, 125, 126, 127];

[0060] [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127];

[0061] wherein [-116, -90, -45, -22, 22, 48, 90, 116] are the same as the index values of the second pilot subcarriers, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] are the same as the index values of the second guard subcarriers.

[0062] With reference to the first aspect and the second aspect, in a possible implementation manner, the index values of the first pilot subcarriers include at least one of the following:

[0063] [-245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245];

[0064] [-246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246];

[0065] [-247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247];

[0066] [-248, -247, -246, -245, -238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238, 245, 246, 247, 248];

[0067] [-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]；

[0068] [-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]；

[0069] [-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]；

[0070] [-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]；

[0071] [-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]；

[0072] [-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]；

[0073] [-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];

[0074] wherein [-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238] are the same as the index values of the second pilot subcarriers, and [-256, -255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255] are the same as the index values of the second guard subcarriers.

[0075] With reference to the first aspect and the second aspect, in a possible implementation manner, the index values of the first pilot subcarriers include at least one of the following:

[0076] [-501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501];

[0077] [-502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502];

[0078] [-503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503];

[0079] [-504, -503, -502, -501, -468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468, 501, 502, 503, 504];

[0080] [-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]；

[0081] [-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]；

[0082] [-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]；

[0083] [-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]；

[0084] [-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]；

[0085] [-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]；

[0086] [-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];

[0087] wherein [-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468] are the same as the index values of the second pilot subcarriers, 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] are the same as the index values of the second guard subcarriers.

[0088] With reference to the first aspect and the second aspect, in a possible implementation manner, the index values of the first pilot subcarriers include at least one of the following:

[0089] [-501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501];

[0090] [-502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502];

[0091] [-503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503];

[0092] [-504, -503, -502, -501, -468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468, 501, 502, 503, 504];

[0093] [-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]；

[0094] [-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]；

[0095] [-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]；

[0096] [-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]；

[0097] [-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]；

[0098] [-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]；

[0099] [-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];

[0100] wherein, [–468, –400, –334, –266, –220, –152, –86, –18, 18, 86, 152, 220, 266, 334, 400, 468] are the same as the index values of the second pilot subcarriers, 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] are the same as the index values of the second guard subcarriers.

[0101] With reference to the first aspect and the second aspect, in a possible implementation, 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 data subcarrier and a second pilot subcarrier to the first high-frequency channel.

[0102] In the embodiments of the present application, the first pilot subcarrier is obtained by the second data subcarrier and the second pilot subcarrier (or 0 second pilot subcarriers), which can make the first pilot subcarrier farther from the filter and more secure.

[0103] With reference to the first aspect and the second aspect, in a possible implementation, the index value of the first pilot subcarrier includes at least one of the following:

[0104] [-25,-15,-5,5,15];

[0105] [-25,-15,-5,5,15,25];

[0106] [-28,-20,-12,-4,4,12,20];

[0107] [-28,-20,-12,-4,4,12,20,28];

[0108] [-27, -21, -15, -9, -3, 3, 9, 15, 21];

[0109] [-27, -21, -15, -9, -3, 3, 9, 15, 21, 27];

[0110] [-28, -23, -18, -13, -8, -3, 3, 8, 13, 18, 23];

[0111] Alternatively, the index value of the first pilot subcarrier comprises at least one of:

[0112] [-49, -35, -21 -7, 7, 21, 35];

[0113] [-49, -35, -21 -7, 7, 21, 35, 49];

[0114] [-54, -42, -30, -18, -6, 6 18, 30, 42];

[0115] [-54, -42, -30, -18, -6, 6 18, 30, 42, 54];

[0116] [-55, -45, -35, -25, -15, -5, 5, 15, 25, 35, 45];

[0117] [-55, -45, -35, -25, -15, -5, 5, 15, 25, 35, 45, 55];

[0118] [-52, -44, -36, -28, -20, -12, -4, 4, 12, 20, 28, 36, 44];

[0119] [-52, -44, -36, -28, -20, -12, -4, 4, 12, 20, 28, 36, 44, 52];

[0120] [-53, -46, -39, -32, -25, -18, -11, -4, 4, 11, 18, 25, 32, 39, 46];

[0121] [-53, -46, -39, -32, -25, -18, -11, -4, 4, 11, 18, 25, 32, 39, 46, 53];

[0122] [-58, -52, -46, -40, -34, -28, -22, -16, -10, -4, 4, 10, 16, 22, 28, 34, 40, 46, 52];

[0123] Alternatively, the index value of the first pilot subcarrier comprises at least one of:

[0124] [-108, -84, -60, -36, -12, 12, 36, 60, 84];

[0125] [-108, -84, -60, -36, -12, 12, 36, 60, 84, 108];

[0126] [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90];

[0127] [-110, -90, -70, -50, -30, -10, 10, 30, 50, 70, 90, 110];

[0128] [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99];

[0129] [-117, -99, -81, -63, -45, -27, -9, 9, 27, 45, 63, 81, 99, 117];

[0130] [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98];

[0131] [-113, -98, -83, -68, -53, -38, -23, -8, 8, 23, 38, 53, 68, 83, 98, 113];

[0132] [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98];

[0133] [-113, -98, -85, -72, -59, -46, -33, -20, -7, 7, 20, 33, 46, 59, 72, 85, 98, 113];

[0134] [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54, 66, 78, 90, 102];

[0135] Alternatively, the index value of the first pilot subcarrier comprises at least one of:

[0136] [-108, -84, -60, -36, -12, 12, 36, 60, 84];

[0137] [-108,-84,-60,-36,-12,12,36,60,84,108];

[0138] [-110,-90,-70,-50,-30,-10,10,30,50,70,90];

[0139] [-110,-90,-70,-50,-30,-10,10,30,50,70,90,110];

[0140] [-117,-99,-81,-63,-45,-27,-9,9,27,45,63,81,99];

[0141] [-117,-99,-81,-63,-45,-27,-9,9,27,45,63,81,99,117];

[0142] [-113,-98,-83,-68,-53,-38,-23,-8,8,23,38,53,68,83,98]

[0143] [-113,-98,-83,-68,-53,-38,-23,-8,8,23,38,53,68,83,98,113];

[0144] [-113,-98,-85,-72,-59,-46,-33,-20,-7,7,20,33,46,59,72,85,98];

[0145] [-113,-98,-85,-72,-59,-46,-33,-20,-7,7,20,33,46,59,72,85,98,113];

[0146] [-114,-102,-90,-78,-66,-54,-42,-30,-18,-6,6,18,30,42,54,66,78,90,102];

[0147] Alternatively, the index value of the first pilot subcarrier comprises at least one of:

[0148] [-229,-202,-175,-148,-121,-94,-67,-40,-13,13,40,67,94,121,148,175,202,229];

[0149] [-228,-204,-180,-156,-132,-108,-84,-60,-36,-12,12,36,60,84,108,132,156,180,204,228]；

[0150] [-231,-209,-187,-165,-143,-121,-99,-77,-55,-33,-11,11,33,55,77,99,121,143,165,187,209,231]；

[0151] [-230,-210,-190,-170,-150,-130,-110,-90,-70,-50,-30,-10,10,30,50,70,90,110,130,150,170,190,210,230]；

[0152] [-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]；

[0153] [-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]；

[0154] [-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]；

[0155] [-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]；

[0156] [ -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];

[0157] [ -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];

[0158] [ -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];

[0159] Alternatively, the index value of the first pilot subcarrier comprises at least one of:

[0160] [ -476, -420, -364, -308, -252, -196, -140, -84, -28, 28, 84, 140, 196, 252, 308, 364, 420, 476]

[0161] [ -475, -425, -375, -325, -275, -225, -175, -125, -75, -25, 25, 75, 125, 175, 225, 275, 325, 375 425, 475];

[0162] [ -462, -418, -374, -330, -286, -242, -198, -154, -110, -66, -22, 22, 66, 110, 154, 198, 242, 286, 330, 374, 418, 462];

[0163] [-483,-441,-399,-357,-315,-273,-231,-189,-147,-105,-63,-21,21,63,105,147,189,231,273,315,357,399,441,483]；

[0164] [-475,-437,-399,-361,-323,-285,-247,-209,-171,-133,-95,-57,-19,19,57,95,133,171209,247,285,323,361,399,437,475]；

[0165] [-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]；

[0166] [-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]；

[0167] [-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]；

[0168] [-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]；

[0169] [ -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];

[0170] [ -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];

[0171] Alternatively, the index value of the first pilot subcarrier comprises at least one of:

[0172] [ -476, -420, -364, -308, -252, -196, -140, -84, -28, 28, 84, 140, 196, 252, 308, 364, 420, 476];

[0173] [ -475, -425, -375, -325, -275, -225, -175, -125, -75, -25, 25, 75, 125, 175, 225, 275, 325, 375, 425, 475];

[0174] [ -462, -418, -374, -330, -286, -242, -198, -154, -110, -66, -22, 22, 66, 110, 154, 198, 242, 286, 330, 374, 418, 462];

[0175] [ -483, -441, -399, -357, -315, -273, -231, -189, -147, -105, -63, -21, 21, 63, 105, 147, 189, 231, 273, 315, 357, 399, 441, 483];

[0176] [-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]；

[0177] [-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]；

[0178] [-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]；

[0179] [-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]；

[0180] [-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]；

[0181] [-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]；

[0182] [-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].

[0183] With reference to the first aspect and the second aspect, in a possible implementation, the bandwidth of the first low frequency channel comprises at least one of the following: 20MHz, 40MHz, 80MHz; and the bandwidth of the first high frequency channel comprises at least one of the following: 270MHz, 320MHz, 540MHz, 1080MHz, 2160MHz, 4320MHz, 8640MHz.

[0184] In the third aspect, the embodiments of the present application provide a communication apparatus for performing the method in the first aspect or any possible implementation of the first aspect. The communication apparatus comprises units for performing the method in the first aspect or any possible implementation of the first aspect.

[0185] In the fourth aspect, the embodiments of the present application provide a communication apparatus for performing the method in the second aspect or any possible implementation of the second aspect. The communication apparatus comprises units for performing the method in the second aspect or any possible implementation of the second aspect.

[0186] As an example, in the third aspect or the fourth aspect, the communication apparatus can comprise a transceiver unit and a processing unit. The specific description of the transceiver unit and the processing unit can also be referred to the apparatus embodiment shown below.

[0187] As another example, in the third aspect, the communication apparatus can comprise a generating unit and a sending unit. In the fourth aspect, the communication apparatus can comprise a receiving unit and a processing unit. The specific description of the units can also be referred to the apparatus embodiment shown below.

[0188] In the fifth aspect, the embodiments of the present application provide a communication apparatus, which comprises a processor for performing the method in the first aspect or any possible implementation of the first aspect. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method in the first aspect or any possible implementation of the first aspect is performed.

[0189] In a possible implementation, the memory is located outside the communication apparatus.

[0190] In a possible implementation, the memory is located in the communication apparatus.

[0191] In the embodiments of the present application, the processor and the memory can also be integrated in one device, that is, the processor and the memory can also be integrated together.

[0192] In a possible implementation, the communication apparatus further includes a transceiver, configured to receive a signal and / or send a signal. For example, the transceiver can be configured to send a PPDU.

[0193] In a sixth aspect, the embodiments of the present application provide a communication apparatus, including a processor, configured to execute the method in the second aspect or any possible implementation of the second aspect. Alternatively, the processor is configured to execute a program stored in a memory, and when the program is executed, the method in the second aspect or any possible implementation of the second aspect is executed.

[0194] In a possible implementation, the memory is located outside the communication apparatus.

[0195] In a possible implementation, the memory is located in the communication apparatus.

[0196] In the embodiments of the present application, the processor and the memory can also be integrated in one device, that is, the processor and the memory can also be integrated together.

[0197] In a possible implementation, the communication apparatus further includes a transceiver, configured to receive a signal and / or send a signal. For example, the transceiver can be configured to receive a PPDU.

[0198] In a seventh aspect, the embodiments of the present application provide a communication apparatus, including a logic circuit and an interface, coupled with each other; the logic circuit is configured to generate a PPDU; and the interface is configured to output the PPDU.

[0199] Optionally, the communication apparatus further includes a memory, configured to store at least one of the first sequence, the second sequence, the third sequence, the fourth sequence and the fifth sequence.

[0200] Optionally, the communication apparatus further includes a memory, configured to store at least one of a sequence carried by the first STF and a sequence carried by the first LTF.

[0201] In an eighth aspect, the embodiments of the present application provide a communication apparatus, including a logic circuit and an interface, coupled with each other; the interface is configured to input a PPDU; and the logic circuit is configured to process the PPDU.

[0202] In a ninth aspect, an embodiment of the present application provides a computer readable storage medium for storing a computer program which, when executed on a computer, causes the method of the first aspect or any possible implementation of the first aspect to be performed.

[0203] In a tenth aspect, an embodiment of the present application provides a computer readable storage medium for storing a computer program which, when executed on a computer, causes the method of the second aspect or any possible implementation of the second aspect to be performed.

[0204] In an eleventh aspect, an embodiment of the present application provides a computer program product comprising a computer program or computer code (which can also be referred to as instructions) which, when executed on a computer, causes the method of the first aspect or any possible implementation of the first aspect to be performed.

[0205] In a twelfth aspect, an embodiment of the present application provides a computer program product comprising a computer program or computer code (which can also be referred to as instructions) which, when executed on a computer, causes the method of the second aspect or any possible implementation of the second aspect to be performed.

[0206] In a thirteenth aspect, an embodiment of the present application provides a computer program which, when executed on a computer, causes the method of the first aspect or any possible implementation of the first aspect to be performed.

[0207] In a fourteenth aspect, an embodiment of the present application provides a computer program which, when executed on a computer, causes the method of the second aspect or any possible implementation of the second aspect to be performed.

[0208] In a fifteenth aspect, an embodiment of the present application provides a wireless communication system comprising a transmitting end and a receiving end, wherein the transmitting end is configured to perform the method of the first aspect or any possible implementation of the first aspect, and the receiving end is configured to perform the method of the second aspect or any possible implementation of the second aspect. BRIEF DESCRIPTION OF DRAWINGS

[0209] Figure 1 FIG. 1 is a schematic diagram of a communication system according to an embodiment of the present application;

[0210] Figure 2 FIG. 2 is a flowchart of a PPDU-based communication method according to an embodiment of the present application;

[0211] Figure 3ais a process schematic diagram of a sending end generating a PPDU provided by an embodiment of the present application.

[0212] Figure 3b is a process schematic diagram of a receiving end processing a PPDU provided by an embodiment of the present application.

[0213] Figure 4 is a simulation result schematic diagram provided by an embodiment of the present application.

[0214] Figure 5 is a structure schematic diagram of a communication device provided by an embodiment of the present application.

[0215] Figure 6 is a structure schematic diagram of a communication device provided by an embodiment of the present application.

[0216] Figure 7 is a structure schematic diagram of a communication device provided by an embodiment of the present application. DETAILED DESCRIPTION

[0217] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described below with reference to the drawings.

[0218] The terms "first" and "second" and the like in the specification of the present application, claims, and drawings are used only to distinguish different objects, and are not used to describe a particular order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device, etc. including a series of steps or units is not limited to the listed steps or units, but can optionally include other steps or units not listed or inherent to the process, method, product or device, etc.

[0219] "Embodiment" mentioned in this document means that the specific features, structures or characteristics described in connection with the embodiment can be included in at least one embodiment of the present application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment to other embodiments. Those skilled in the art can explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0220] In the present application, “at least one” means one or more, “multiple” means two or more, “at least two” means two or three and three or more, and “and / or” is used to describe the relationship between associated objects, indicating that there can be three relationships, for example, “A and / or B” can represent three cases: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character “ / ” generally represents an “or” relationship between the associated objects before and after it. “At least one of” or similar expressions means any combination of these items. For example, at least one of a, b or c can mean a, b, c, “a and b”, “a and c”, “b and c”, or “a and b and c”.

[0221] The technical solutions provided in the present application can be applied to a wireless local area network (WLAN) system, such as Wi-Fi, etc. The method provided in the present application can be applicable to IEEE 802.11 series protocols, such as 802.11a / b / g protocols, 802.11n protocols, 802.11ac protocols, 802.11ax protocols, 802.11be protocols, or next-generation protocols, etc., which will not be listed one by one here. The technical solutions provided in the present application can also be applied to a wireless personal area network (WPAN) based on UWB technology. The method provided in the present application can be applicable to IEEE 802.15 series protocols, such as 802.15.4a protocols, 802.15.4z protocols, or 802.15.4ab protocols, or a future generation UWB WPAN protocol, etc., which will not be listed one by one here. The technical solutions provided in the present application can also be applied to other types of communication systems, for example, can be an internet of things (IoT) system, a vehicle to X (V2X), a narrow band internet of things (NB-IoT) system, a device applied to vehicle networking, an internet of things (IoT) node, a sensor, etc. in the internet of things (IoT), a smart camera in smart home, a smart remote controller, a smart water meter, an electric meter, and a sensor in smart city, etc. It can also be applicable to a long term evolution (LTE) system, a 5th-generation (5G) communication system, and a new communication system (such as 6G) that will appear in future communication development, etc.

[0222] Although the embodiments of the present application are mainly described by taking WLAN as an example, especially the network applying to the IEEE 802.11 series standards. It is easy for those skilled in the art to understand that each aspect of the present application can be extended to other networks applying various standards or protocols. For example, Bluetooth, high performance radio LAN (HIPERLAN) (a wireless standard similar to the IEEE 802.11 standard, mainly used in Europe) and wide area network (WAN) or other now known or later developed networks. Therefore, regardless of the coverage range and wireless access protocol used, the various aspects provided by the present application can be applied to any suitable wireless network.

[0223] The method provided by 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).

[0224] The access point is a device with wireless communication function, which supports communication or sensing by using WLAN protocol, has the function of communicating or sensing with other devices (such as stations or other access points) in the WLAN network, and of course, can also have the function of communicating or sensing with other devices. Alternatively, the access point is equivalent to a bridge connecting wired network and wireless network, and the main function is to connect various wireless network clients together and then access the wireless network to the Ethernet. In the WLAN system, the access point can be called access point station (AP STA). The device with wireless communication function can be a whole machine device, or a chip or processing system installed in the whole machine device, and the device installed with the chip or processing system can realize the method and function of the embodiments of the present application under the control of the chip or processing system. The AP in the embodiments of the present application is a device providing service for the STA, which can support 802.11 series protocol or subsequent protocol, etc. For example, the access point can be an access point for terminals (such as mobile phones) to enter wired (or wireless) network, which is mainly deployed in homes, buildings and parks, and the typical coverage radius is dozens of meters to hundreds of meters, and of course, it can also be deployed outdoors. For another example, the AP can be a communication server, a router, a switch, a network bridge and other communication entities; the AP can include various forms of macro base stations, micro base stations, relay stations, etc., and of course the AP can also be a chip and a processing system in these various forms of devices, so as to realize the method and function of the embodiments of the present application. The access point in the present application can be a HE AP or an EHT AP, and can also be an access point applying to future Wi-Fi standards, etc.

[0225] A station is a device with wireless communication function, which supports communication or sensing using WLAN protocol, and has the ability to communicate or sense with other stations or access points in the WLAN network. In the WLAN system, the station can be referred to as a non-access point station (non-AP STA). For example, the STA is any user communication device that allows a user to communicate or sense with an AP and then communicate with the WLAN. The device with wireless communication function can be a whole device, or a chip or processing system installed in the whole device, and the device installed with the chip or processing system can realize the method and function of the embodiments of the present application under the control of the chip or processing system. For example, the station can be a wireless communication chip, a wireless sensor or a wireless communication terminal, and can also be referred to as a user. For another example, the station can be a mobile phone supporting Wi-Fi communication function, a tablet computer supporting Wi-Fi communication function, a set-top box supporting Wi-Fi communication function, a smart TV supporting Wi-Fi communication function, a smart wearable device supporting Wi-Fi communication function, a vehicle-mounted communication device supporting Wi-Fi communication function, and a computer supporting Wi-Fi communication function, etc.

[0226] The WLAN system can provide high-rate and low-latency transmission. With the continuous evolution of WLAN application scenarios, the WLAN system will be applied to more scenarios or industries, such as the Internet of Things industry, the Internet of Vehicles industry, or the banking industry, enterprise offices, stadiums and exhibition halls, concert halls, hotel rooms, dormitories, hospital rooms, classrooms, supermarkets, squares, streets, production workshops and warehouses, etc. Of course, the devices supporting WLAN communication or sensing (such as access points or stations) can be sensor nodes in smart cities (such as smart water meters, smart electricity meters, smart air detection nodes), smart devices in smart homes (such as smart cameras, projectors, display screens, televisions, sound systems, refrigerators, washing machines, etc.), nodes in the Internet of Things, entertainment terminals (such as AR, VR, etc. wearable devices), smart devices in smart offices (such as printers, projectors, amplifiers, sound systems, etc.), Internet of Vehicles devices in the Internet of Vehicles, infrastructure in daily life scenarios (such as vending machines, self-service navigation stations in supermarkets, self-service checkout devices, self-service ordering machines, etc.), and devices in large sports and music venues, etc. For example, the access point and the station can be devices applied to the Internet of Vehicles, Internet of Things nodes, sensors, smart cameras in smart homes, smart remote controls, smart water and electricity meters, and sensors in smart cities. The specific forms of the STA and the AP are not limited in the embodiments of the present application, which are only exemplary descriptions.

[0227] Exemplarily, the communication system to which the method provided by the present application can be applied can include an access point and a station. For example, the present application can be applied to a scenario of communication or sensing between an AP and a STA in a WLAN. Optionally, the AP can communicate or sense with a single STA, or the AP can simultaneously communicate or sense with multiple STAs. Specifically, the AP communicating or sensing with multiple STAs can further be divided into downlink transmission in which the AP simultaneously sends signals to multiple STAs, and uplink transmission in which multiple STAs send signals to the AP. The AP and the STA can support a WLAN communication protocol therebetween, and the communication protocol can include protocols in the IEEE 802.11 series, such as protocols applicable to the 802.11be standard, and of course, protocols applicable to standards later than the 802.11be standard.

[0228] Figure 1 is a schematic diagram of an architecture of a communication system provided by an embodiment of the present application. The communication system can include one or more APs and one or more STAs. Figure 1 Two access points, such as AP1 and AP2, and three stations, such as STA1, STA2, and STA3, are shown in FIG. 1. It can be understood that one or more APs can communicate with one or more STAs. Of course, APs can communicate with APs, and STAs can communicate with STAs.

[0229] It can be understood that, Figure 1 In FIG. 1, a STA is taken as a mobile phone, and an AP is taken as a router as an example, which does not mean that the types of APs and STAs in the present application are limited. Meanwhile, Figure 1 Two APs and three STAs are only exemplarily shown, but the number of APs or STAs can be more or less, which is not limited in the present application.

[0230] For ease of description, the method provided by the present application will be described below by taking a sending end and a receiving end as examples. The sending end can include the AP, and the receiving end can include the STA; or the sending end includes the STA, and the receiving end includes the AP; or the sending end and the receiving end are both APs; or the sending end and the receiving end are both STAs.

[0231] It can be understood that the symbol shown below can be referred to as an OFDM symbol, and the OFDM symbol can be described as follows.

[0232] Orthogonal frequency division multiplexing is a multi-carrier transmission technology, which can use a large number of adjacent orthogonal subcarriers, and each subcarrier can be modulated by using a modulation technology, so that the orthogonal frequency division multiplexing technology can have the ability of high-rate transmission, and can effectively resist frequency selective fading. In the WLAN communication protocol, each OFDM symbol can include pilot subcarriers, data subcarriers, guard subcarriers and direct current subcarriers. Among them, the guard subcarriers and the direct current subcarriers can not carry signals, or the signals carried by the guard subcarriers and the direct current subcarriers can be considered as 0. The pilot subcarrier is a subcarrier carrying a pilot in an OFDM symbol, and the data subcarrier is a subcarrier placing or carrying data; it can also be considered that the data subcarrier is applied to carry load information, and the pilot subcarrier is used to carry a pilot signal, and its value is usually 1 or -1. In a communication system, the pilot subcarrier can be used to help detect and correct subcarrier phase offset (or used for residual frequency offset and phase noise estimation), so as to improve the accuracy of data subcarrier analysis. Based on the role of the pilot subcarrier, the number of pilot subcarriers can affect the accuracy of the receiving end correcting the frequency offset or phase offset, and then affect the bit error rate of the receiving end receiving the signal or the required signal-to-noise ratio.

[0233] It can be understood that the description of the OFDM symbol is applicable to each embodiment shown below.

[0234] With the development of WLAN protocols (such as 802.11 series protocols), the supported bandwidth is getting larger and larger (such as from 20M to 320M), the supported frequency band is getting higher and higher, and the spectrum efficiency and throughput are also continuously improved. The 802.11 series protocols can include low-frequency band protocols and high-frequency band protocols. For example, the low-frequency band protocols can include 802.11, 802.11b, 802.11a, 802.11g, 802.11n, 802.11ac, 802.11ax, 802.11be and the like, which are not listed one by one here. For example, the high-frequency band protocols can include 802.11aj, 802.11ay and the like, which are not listed one by one here. Different PPDU structures can be used for different protocols, which can be referred to related standards or protocols, and the present application does not show them one by one.

[0235] In some embodiments, a baseband chip can be designed for high-band signals and low-band signals respectively. In other embodiments, a fusion baseband chip can be designed for high-band signals and low-band signals. However, the above two ways are high in cost for chip design, development, debugging, etc. Therefore, in yet other embodiments, the following method A is proposed: directly sending a high-band signal obtained by expanding the subcarrier spacing of a low-band signal, that is, the number of pilot subcarriers used by the high-band signal is equal to the number of pilot subcarriers used by the low-band signal, and there is a mapping relationship between the positions of the pilot subcarriers used by the high-band signal and the positions of the pilot subcarriers used by the low-band signal; the number of guard subcarriers used by the high-band signal is equal to the number of guard subcarriers of the low-band signal, and there is a mapping relationship between the positions of the guard subcarriers used by the high-band signal and the positions of the guard subcarriers used by the low-band signal. Thus, the transmission mode of the high-band signal is closer to that of the low-band signal, and the complexity of designing a baseband chip compatible with high and low frequencies is reduced.

[0236] However, in the above method A, the high-band signal is directly sent by expanding the subcarrier spacing of the low-frequency protocol signal. The number of pilots, the index of the pilot subcarriers, etc. are directly consistent with the number of pilots, the index (index) of the pilot subcarriers, etc. involved in the 802.11n / 802.11ac / 802.11ax / 802.11be protocol. However, 802.11n / 802.11ac / 802.11ax / 802.11be is a protocol applicable to sub-7GHz frequency bands, and the signal obtained by expanding the subcarrier spacing is directly placed in a greater than or equal to (super) 45G frequency band transmission. Because the channel environment, interference strength, etc. faced by the high-band signal are different from those of the low-band, the original number of pilots is no longer optimal, such as the number of pilots may be insufficient. It can be understood that the pilot shown in this application can also be understood as a pilot subcarrier. The above-mentioned greater than 45G or equal to 45G frequency band can include 45G frequency band or 60G frequency band, etc.

[0237] In view of this, the embodiments of the present application provide a PPDU-based communication method and device, which can effectively ensure the number of pilots, so that the receiving end can process based on a larger number of pilots, improve the accuracy of correcting frequency offset and / or phase offset of the receiving end, and improve the accuracy of demodulation of the receiving end.

[0238] Before introducing the method provided by the embodiments of the present application, the principles of the embodiments of the present application are described in detail.

[0239] In the process of expanding the subcarrier spacing of the low-band signal to obtain the high-band signal, the subcarrier spacing of the high-band signal is expanded, and the signal bandwidth of the high-band signal is also expanded. The low-band signal shown here can be understood as a signal transmitted through a first low-frequency channel, and the high-band signal can be understood as a signal transmitted through a first high-frequency channel. The signal bandwidth shown in the present application refers to the sample rate of the signal, which can be determined by the sampling clock of the baseband. In the low-band protocol, the signal bandwidth can be equal to the channel bandwidth. However, in the high-band protocol, the relationship between the signal bandwidth and the channel bandwidth is not limited, such as the signal bandwidth can be equal to the channel bandwidth, or the signal bandwidth can be less than the channel bandwidth, and of course the signal bandwidth can be greater 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 allowed to pass. The bandwidth of the first low-frequency channel can include at least one of the following: 20MHz, 40MHz, 80MHz, 160MHz, 320MHz, and the bandwidth of the first high-frequency channel can include at least one of the following: 270MHz, 320MHz, 540MHz, 1080MHz, 2160MHz, 4320MHz, 8640MHz. The bandwidth of the first low-frequency channel and the bandwidth of the first high-frequency channel shown here can be understood as the channel bandwidth shown in the present application.

[0240] Although the subcarrier spacing is enlarged, the DFT size corresponding to the first high-frequency channel is the same as the DFT size of the first low-frequency channel. Thus, the first high-frequency channel includes the same total number of subcarriers as the first low-frequency channel, and each subcarrier included in the first high-frequency channel has a mapping relationship with each subcarrier included in the first low-frequency channel, such as the index value of a subcarrier in the first high-frequency channel being the same as the index value of a subcarrier in the first low-frequency channel. The above-mentioned "the index value of a subcarrier in the first high-frequency channel being the same as the index value of a subcarrier in the first low-frequency channel" can also be understood as: the relative index value of a subcarrier in the first high-frequency channel being the same as the relative index value of a subcarrier in the first low-frequency channel (that is, the same set of index values is used to mark subcarriers in the first high-frequency channel and the first low-frequency channel), but the subcarrier corresponding to a certain index value in the first high-frequency channel is different from the subcarrier corresponding to the certain index value in the first low-frequency channel in position, such as the subcarrier spacing corresponding to the index value in the first high-frequency channel being greater than the subcarrier spacing corresponding to the index value in the first low-frequency channel, or such as the frequency point of the subcarrier corresponding to the index value in the first high-frequency channel being different from the frequency point of the subcarrier corresponding to the index value in the first low-frequency channel. The above-mentioned relative index value refers to the index value of a subcarrier A relative to a subcarrier B in the first high-frequency channel, or the index value of a subcarrier A relative to a subcarrier B in the first low-frequency channel. It can be understood that the above-mentioned A and B can be understood as the index value of a subcarrier, the absolute position of the subcarrier A in the first high-frequency channel being different from the absolute position of the subcarrier A in the first low-frequency channel, and the absolute position of the subcarrier B in the first high-frequency channel being different from the absolute position of the subcarrier B in the first low-frequency channel. The subcarrier A and the subcarrier B shown herein are a general description and should not be understood as limiting the embodiments of the present application.

[0241] 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. If the 20 MHz is a channel bandwidth defined in the 802.11ac protocol, the total number of subcarriers included in the 20 MHz channel bandwidth is 64, or in other words, the DFT size of the channel bandwidth is 64, and the subcarrier spacing is 312.5 kHz. Correspondingly, the first high-frequency channel includes a total of 64 subcarriers, such as a subcarrier spacing of 3.75 MHz (based on 12 times the subcarrier spacing of 312.5 kHz of the 20 MHz). It can be understood that the bandwidth obtained based on the subcarrier spacing and the total number of subcarriers is 3.75 MHz*64=240 MHz, which can be understood as the signal bandwidth of the PPDU transmitted through the first high-frequency channel.

[0242] For example, the bandwidth of the first low frequency channel is 20MHz, the bandwidth of the first high frequency channel is 540MHz, the 20MHz is the channel bandwidth defined in the 802.11ac protocol, the total number of subcarriers included in the 20MHz channel bandwidth is 64, or the DFT size of the channel bandwidth is 64, and the subcarrier spacing is 312.5kHz. Correspondingly, the first high frequency channel includes a total of 64 subcarriers, or the DFT size is 64, and the subcarrier spacing is 7.8125MHz (based on 25 times the subcarrier spacing of 312.5kHz of the 20MHz). It can be understood that the bandwidth obtained based on the subcarrier spacing and the total number of subcarriers is 7.8125MHz*64=500MHz, which can be understood as the signal bandwidth of the PPDU transmitted through the first high frequency channel.

[0243] For 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, then the subcarrier spacing corresponding to the first high frequency channel is 3.75 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 3.5156 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 7.8125 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 3.5156 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 7.03125 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 3.5156 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 7.03125 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 3.5156 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 7.93 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 3.91 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 7.8125 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 8.2 MHz. For 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, then the subcarrier spacing corresponding to the first high frequency channel is 4.05 MHz.

[0244] It can be understood that each of the subcarrier intervals shown above is only an example and should not be construed as a limitation on the embodiments of the present application.

[0245] The description of the first low frequency channel and the first high frequency channel can also refer to the following.

[0246] Figure 2 is a flowchart of a PPDU-based communication method provided by the embodiments of the present application, as shown in Figure 2 The method comprises:

[0247] 201, the sending end generates a PPDU.

[0248] The sending end can generate the PPDU based on the subcarriers involved in the first high frequency channel. For example, the sending end can generate an OFDM symbol based on the first pilot subcarriers and / or the first data subcarriers, and generate the PPDU based on the OFDM symbol.

[0249] For example, in the frequency domain, the sending end can perform channel coding and digital modulation (for example, using quadrature amplitude modulation (QAM) technology) on the information bits, frequency domain mapping to generate OFDM symbols, serial-parallel conversion, inverse discrete fourier transform (IDFT), insertion of a cyclic prefix and windowing, and parallel-serial conversion to obtain a digital signal, after which the digital signal is converted into an analog signal through a digital-to-analog converter. When the sending end performs OFDM modulation, the object of its modulation can be the content obtained after other operations on the information bit stream, such as quadrature amplitude modulation (QAM) symbols or binary phase shift keying (BPSK) modulation symbols, etc., which are not listed one by one here. The information bit stream shown here can be understood as being obtained based on at least one of a sequence carried by a legacy short training field (L-STF), a sequence carried by a legacy long training field (L-LTF), signaling information, or data source information. As an example, the process of generating a PPDU by the sending end can also refer to the method shown in Figure 3a .

[0250] 202, the sending end transmits the PPDU on the first high frequency channel. Correspondingly, the receiving end receives the PPDU on the first high frequency channel.

[0251] The first high-frequency channel includes first pilot subcarriers and first data subcarriers, the first high-frequency channel corresponds to a discrete fourier transform (DFT) size same as a DFT size corresponding to the first low-frequency channel, and 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.

[0252] The DFT size can also be referred to as a DFT size, and the DFT size can be the number of points of the discrete fourier transform. The DFT size corresponding to the first high-frequency channel is same as the DFT size corresponding to the first low-frequency channel can also be understood as at least one of the following: the total number of subcarriers included in the first high-frequency channel is 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 same as the index value of the subcarriers in the first low-frequency channel; 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 20MHz. Through the above-mentioned sample rate relationship, the sampling clock multiplexing can be realized. The sample rate can also be referred to as a baseband clock frequency or a baseband sampling clock frequency, etc. It can be understood that for the sending end, the DFT size can be the size when the sending end performs IDFT; for the receiving end, the DFT size is the size when the receiving end performs DFT.

[0253] In the embodiment of the application, the first pilot subcarriers can have a mapping relationship with at least one of the following subcarriers, in other words, the first pilot subcarriers in the first high-frequency channel can be mapped to the first high-frequency channel from the following subcarriers in the first low-frequency channel: one or more second pilot subcarriers, one or more second guard subcarriers, and one or more second data subcarriers. The following is described in detail:

[0254] As a possible implementation, the first pilot subcarriers have a mapping relationship with the second pilot subcarriers and the second guard subcarriers in the first low-frequency channel. The first pilot subcarriers in the first high-frequency channel can be obtained by mapping the second pilot subcarriers and the second guard subcarriers in the first low-frequency channel to the first high-frequency channel. For example, the index value of the first pilot subcarriers includes at least one of the following: the index value of the second guard subcarriers, and the index value of the second pilot subcarriers. The first pilot subcarriers obtained by this implementation have less changes relative to the low-frequency protocol.

[0255] As another possible implementation, the first pilot subcarrier is mapped with a second data subcarrier in the first low frequency channel. For example, the index value of the first pilot subcarrier includes the index value of the second data subcarrier. In this way, the first pilot subcarrier is far away from the filter, and is safer.

[0256] As yet another possible implementation, the first pilot subcarrier is mapped with a second data subcarrier and a second pilot subcarrier in 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. In this way, the first pilot subcarrier is far away from the filter, and is safer.

[0257] Based on the index value of the first pilot subcarrier and the subcarrier spacing in the first high frequency channel, the position of each first pilot subcarrier, or the frequency point of each first pilot subcarrier, etc. can be obtained.

[0258] It can be understood that the above three implementations can be separate or combined with each other, and the embodiments of the present application do not limit this. The descriptions 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 can be referred to below, such as Tables 1 to 14.

[0259] 203, the receiving end processes the PPDU.

[0260] The process of generating the PPDU by the sending end can be understood as processing the information of the signal source by the sending end, so that it becomes a signal suitable for transmission. Correspondingly, the process of processing the PPDU by the receiving end can be understood as extracting the information of the signal source from the received signal. Therefore, the process of processing the PPDU by the receiving end can be adaptively referred to the process of generating the PPDU by the sending end. As a possible implementation, the step of processing the PPDU by the receiving end can include: the receiving end acquires the pilot signal in the PPDU on the first pilot subcarrier corresponding to the index value of the first pilot subcarrier based on the index value of the first pilot subcarrier; and then processes based on the pilot signal. For example, the receiving end can estimate and / or compensate the phase offset based on the pilot signal, and for another example, the receiving end can estimate and / or compensate the frequency offset based on the pilot signal. In this way, the receiving end can correct the phase offset of the data subcarrier, and further improve the demodulation accuracy. As an example, the process of processing the PPDU by the receiving end can also be referred to the method shown below. Figure 3b

[0261] Of course, the receiving end can also perform channel estimation, channel equalization, synchronization, etc. based on the PPDU, which will not be described one by one here. ​

[0262] It should be understood that the embodiments of the present application mainly relate to the index values of pilot subcarriers, data subcarriers and the like utilized when generating a PPDU, and for the frame structure of the PPDU, reference can be made to relevant standards or protocols, and the embodiments of the present application will not be listed again.

[0263] It should be understood that the above is described by describing the mapping relationship between the first high frequency channel and the first low frequency channel. However, it can be understood that in one implementation, the protocol describes the mapping relationship between the first high frequency channel and the first low frequency channel; in another implementation, the first pilot subcarrier and the first data subcarrier in the first high frequency channel can be set or specified by the protocol. Therefore, the above-mentioned method can also be replaced by: the sending end generates a PPDU; the PPDU is sent on the first high frequency channel, and correspondingly, the receiving end receives the PPDU; the receiving end processes the PPDU. Wherein, the bandwidth of the first high frequency channel is any one of the following: 270MHz, 320MHz, 540MHz, 1080MHz, 2160MHz, 4320MHz, 8640MHz. The first high frequency channel includes a first pilot subcarrier, and the number of the first pilot subcarrier is at least one of the following: 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 22, 24, 26, 28, 30, 32, 34, 36, 38. The total number of subcarriers in the first high frequency channel includes data subcarriers, pilot subcarriers, direct current subcarriers, guard subcarriers and the like, and the total number of subcarriers is any one of the following: 64, 128, 256, 512, 1024, 2048. It can be understood that the index values and / or positions of each first pilot subcarrier can be referred to the above, which will not be described one by one. The index values of the first pilot subcarrier and the index values of the first guard subcarrier can be referred to Tables 1 to 14 below.

[0264] In the embodiments of the present application, by ensuring that the number of first pilot subcarriers is greater than the number of second pilot subcarriers, the receiving end can have a sufficient number of pilot carriers to correct frequency offset, and the accuracy of data demodulation at the receiving end can be improved. Compared with the scheme of directly expanding the subcarrier spacing of the low-frequency signal to obtain a high-frequency signal and without changing the number of pilot carriers, since the interference of the high-frequency signal is greater than that of the low-frequency signal, if the number of pilot carriers does not change, the receiving end can not have a sufficient number of pilot carriers to correct frequency offset, which can cause inaccurate estimation of the phase offset of the receiving end, and the phase offset accompanying the data subcarriers cannot be accurately compensated, thereby affecting the demodulation accuracy of the signal. Further, the method provided in the embodiments of the present application can also make the processing principles of the high-frequency signal and the low-frequency signal close, and realize the compatibility of the baseband chip. For example, the method provided in the embodiments of the present application can reduce the modification of the low-frequency baseband chip, and is conducive to multiplexing the high-frequency signal and the low-frequency signal baseband.

[0265] The following detailed description describes the process of generating a PPDU at the sending end, and the process of processing the PPDU at the receiving end.

[0266] Figure 3a FIG. 1 is a schematic diagram of a process of generating a PPDU at a sending end according to an embodiment of the present application. Figure 3a As shown in FIG. 1, the process of generating a PPDU at the sending end can be as follows:

[0267] The information bits can be processed by scrambling (or a scrambler as shown in FIG. 2), LDPC encoding (or an encoder as shown in FIG. 3), stream parsing (or a stream parser as shown in FIG. 4), constellation mapping (or a constellation mapper as shown in FIG. 5), LDPC subcarrier mapping (or an LDPC tone mapper as shown in FIG. 6), CSD per SS, spatial and frequency mapping, etc., to form a frequency domain signal, and then the frequency domain signal is converted into a time domain signal by IDFT, and then OFDM symbols are formed by inserting a cyclic prefix and windowing (insertGI and window), and then the OFDM symbols are transmitted through analog and RF circuits, wherein a plurality of OFDM symbols constitute a PPDU. Optionally, the sending end can also perform PHY padding before forward error correction (FEC) (pre-FEC as shown in FIG. 7). Optionally, the sending end can also perform PHY padding after FEC (post-FEC as shown in FIG. 8). Figure 3a Figure 3a Figure 3a Figure 3a Figure 3a Figure 3a Figure 3b ​​​​​​​

[0268] Figure 3b is a process diagram of receiving end processing PPDU provided by an embodiment of the present application, as shown in Figure 3b , the process of receiving end processing PPDU can be as follows:

[0269] For each OFDM symbol in the PPDU, the signal can be received through analog and radio frequency circuits first, converted into digital baseband signal, then the cyclic prefix is removed, and then the frequency domain signal is obtained through DFT, and then the phase offset and / or frequency offset is corrected through processing the pilot signal, the channel impact is removed through channel estimation and equalization, and finally the source information bits are recovered through deinterleaving (or demapper as shown in Figure 3b ), constellation point mapping (also known as constellation or constellation demapper as shown in Figure 3b ), channel decoding (LDPC decoding or deencoder as shown in Figure 3b ), descrambling (descrambler as shown in Figure 3a ) and the like.

[0270] It should be understood that Figure 3b and Figure 4 the processes shown are only examples, the sending end can have more or fewer steps in the step of generating the PPDU, and the receiving end can have more or fewer steps in the step of processing the PPDU, which is not limited by the embodiments of the present application.

[0271] The pilot subcarriers provided by the embodiments of the present application will be described below in conjunction with specific examples. It should be understood that the first pilot subcarriers shown in Tables 1 to 14 below are only examples, and in specific implementations, the number of first pilot subcarriers can be more or the index values of the first pilot subcarriers can be different, which is not limited by the embodiments of the present application.

[0272] Example 1,

[0273] In the 802.11ac protocol, a subcarrier plan in a 20MHz bandwidth can be shown as follows: containing 64 subcarriers, whose index values are defined in turn as -32:31. Among them, the subcarrier with an index value of 0 is a direct current subcarrier, bearing a value of 0; the subcarriers with index values of -32:-29 and 29:31 are guard subcarriers, i.e. [-32,-31,-30,-29,29,30,31], bearing a value of 0; the subcarriers with index values of [-21,-7,7,21] are pilot subcarriers, bearing a value of +1 or -1; the rest are data subcarriers, bearing modulation symbols. It can be understood that the pilot subcarriers in the 802.11ac shown here are the second pilot subcarriers shown in the embodiments of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0274] Optionally, the subcarriers in the high frequency channel that have a mapping relationship with the guard subcarriers in the low frequency channel can be used as pilot subcarriers. In other words, the subcarriers in the high frequency channel that have the same index values as the guard subcarriers in the low frequency channel are used as pilot subcarriers, or in other words, some of the pilot subcarriers in the high frequency channel have the same index values as the guard subcarriers in the low frequency channel. Optionally, the subcarriers in the high frequency channel that have a mapping relationship with the pilot subcarriers in the low frequency channel can be used as pilot subcarriers. In other words, the subcarriers in the high frequency channel that have the same index values as the pilot subcarriers in the low frequency channel are used as pilot subcarriers, or in other words, some of the pilot subcarriers in the high frequency channel have the same index values as the pilot subcarriers in the low frequency channel. For example, the index value of the first pilot subcarrier can satisfy at least one of the following conditions: the index value of the first pilot subcarrier is the same as the index value of one or more of the second guard subcarriers, and the index value of the first pilot subcarrier is the same as the index value of one or more of the second pilot subcarriers. The position of the first pilot subcarrier shown in Table 1 can be determined based on the subcarrier spacing of the first high frequency channel, the index value of the first pilot subcarrier, or 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 subcarriers involved in the 20 MHz bandwidth in 802.11ac, and the position of the second guard subcarriers selected as the supplementary first pilot subcarriers. Optionally, the subcarriers in the high frequency channel that have a mapping relationship with the data subcarriers in the low frequency channel can be used as pilot subcarriers. In other words, the subcarriers in the high frequency channel that have the same index values as the data subcarriers in the low frequency channel are used as pilot subcarriers, or in other words, some of the pilot subcarriers in the high frequency channel have the same index values as the data subcarriers in the low frequency channel. For example, the index value of the first pilot subcarrier can satisfy at least one of the following conditions: the index value of the first pilot subcarrier is the same as the index value of one or more of the second data subcarriers, and the index value of the first pilot subcarrier is the same as the index value of one or more of the second pilot subcarriers. The first pilot subcarrier shown in Table 2 can be understood as a reconfigured pilot subcarrier. It can be understood that 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 in the embodiments of the present application are also applicable to other embodiments of the present application, such as Examples 2 to 7 shown below.

[0275] For example, Table 1 and Table 2 are index values of a first pilot subcarrier and a first guard subcarrier provided by an embodiment of the present application. For Table 1 and Table 2, [-21, -7, 7, 21] are the same as index values of a second pilot subcarrier, and [-32, -31, -30, -29, 29, 30, 31] are the same as index values of a second guard subcarrier. As shown in the second row of Table 1, -29 in the index values of the first pilot subcarrier can be understood as having a mapping relationship with a guard subcarrier under a 20MHz bandwidth of 802.11ac, i.e., a subcarrier in a high frequency channel having the same index value as a guard subcarrier in a low frequency channel is affected by the pilot subcarrier. As shown in the second row of Table 2, the index values [-25, -15, -5, 5, 15] of the first pilot subcarrier can be understood as having a mapping relationship with data subcarriers (i.e., five second data subcarriers) under a 20MHz bandwidth of 802.11ac, i.e., a subcarrier in a high frequency channel having the same index value as a data subcarrier in a low frequency channel is affected by the pilot subcarrier. For Table 1 and Table 2, the number of the first pilot subcarriers is greater 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 less than the number of the second guard subcarriers.

[0276] Table 1

[0277]

[0278] The first pilot subcarriers and the first guard subcarriers shown in Table 1 are less changed relative to the second pilot subcarriers and the second guard subcarriers.

[0279] It can be understood that, in the index values -32:31, except for the index values of the first pilot subcarriers shown in Table 1, the index values of the first guard subcarriers shown in Table 1, and the direct current subcarrier (having an index value of 0), the remaining index values are index values of first data subcarriers.

[0280] Table 2

[0281]

[0282]

[0283] The first guard subcarriers shown in Table 2 can be as evenly and discretely distributed as possible in the entire frequency band, and can be symmetrically distributed in positive and negative frequencies, which can effectively improve the accuracy of phase frequency offset and / or frequency frequency offset at the receiving end. The first pilot subcarriers shown in Table 2 are far from the filter and have high security. It can be understood that, in the index values -32:31, except for the index values of the first pilot subcarriers shown in Table 2, the index values of the first guard subcarriers shown in Table 2, and the direct current subcarrier (having an index value of 0), the remaining index values are index values of first data subcarriers.

[0284] It can be understood that the last row of Table 1 and Table 2 represents no guard subcarriers. Alternatively, when no guard subcarriers are included in the high frequency channel, the guard bandwidth shown below can be used as the transition band bandwidth in combination with the guard bandwidth shown below. It can be understood that the description about the guard subcarriers is also applicable to Examples 2 to 7 below, which will not be repeated here.

[0285] For Example 1 shown in the embodiments of the present application, the bandwidth of the first low frequency channel can be 20MHz, and the bandwidth of the first high frequency channel can be any one of 270MHz, 540MHz, 1080MHz, 2160MHz.

[0286] Example 2,

[0287] In the 802.11ac protocol, the subcarrier plan under the 40MHz bandwidth is shown as follows: including 128 subcarriers, the index values are defined in turn as -64:63. Among them, the subcarriers with index values of -1, 0, 1 are direct current subcarriers, carrying values of 0; the subcarriers with index values of -64:-59 and 59:63 are guard subcarriers, i.e. [-64,-63,-62,-61,-60,-59,59,60,61,62,63] carrying values of 0; the subcarriers with index values of [-53,-25,-11,11,25,53] are pilot subcarriers, carrying values of +1 or -1, and the rest are data subcarriers. The pilot subcarriers shown in 802.11ac here are the second pilot subcarriers shown in the embodiments of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0288] For the relationship between the pilot subcarriers in the high frequency channel and the data subcarriers in the low frequency channel, the relationship with the pilot subcarriers in the low frequency channel, and the relationship with the guard subcarriers in the low frequency channel, reference can be made to the description in Example 1 above, which will not be repeated here. For example, the index value of the first pilot subcarrier can satisfy at least one of the following: the index value of the first pilot subcarrier is the same as the index value of the 1-11 second guard subcarriers described above; the index value of the first pilot subcarrier is the same as the index value of the 1-6 second pilot subcarriers described above. The position of the first pilot subcarrier shown in Table 3 can be determined based on the subcarrier spacing of the first high frequency channel and the index value of the first pilot subcarrier. For another example, the index value of the first pilot subcarrier can satisfy at least one of the following: the index value of the first pilot subcarrier is the same as the index value of one or more second data subcarriers, and the index value of the first pilot subcarrier is the same as the index value of 1-6 second pilot subcarriers. The first pilot subcarrier shown in Table 4 can be understood as a reconfigured pilot subcarrier.

[0289] For example, Table 3 and Table 4 are index values of a first pilot subcarrier and a first guard subcarrier provided by an embodiment of the present application. For Table 3 and Table 4, [-53, -25, -11, 11, 25, 53] are the same as index values of a second pilot subcarrier, and [-64, -63, -62, -61, -60, -59, 59, 60, 61, 62, 63] are the same as index values of a second guard subcarrier. As shown in the second row of Table 3, -59 in the index values of the first pilot subcarrier can be understood as having a mapping relationship with the guard subcarrier under the 40MHz bandwidth of 802.11ac, i.e., the subcarrier in the high frequency channel having the same index value as the guard subcarrier in the low frequency channel is the pilot subcarrier. As shown in the second row of Table 4, the index values [-49, -35, -21, -7, 7, 21, 35] of the first pilot subcarrier can be understood as having a mapping relationship with the data subcarrier (i.e., seven data subcarriers corresponding to the second pilot subcarrier) under the 40MHz bandwidth of 802.11ac, i.e., the subcarrier in the high frequency channel having the same index value as the data subcarrier in the low frequency channel is the pilot subcarrier.

[0290] Table 3

[0291]

[0292] It can be understood that, in the index values -64:63, except for the index values of the first pilot subcarrier shown in Table 3, the index values of the first guard subcarrier shown in Table 3, and the direct current subcarriers (index values -1, 0, 1), the remaining index values are index values of the first data subcarrier.

[0293] Table 4

[0294]

[0295] It can be understood that, in the index values -64:63, except for the index values of the first pilot subcarrier shown in Table 4, the index values of the first guard subcarrier shown in Table 4, and the direct current subcarriers (index values -1, 0, 1), the remaining index values are index values of the first data subcarrier.

[0296] For example 2 shown in the embodiment of the present application, the bandwidth of the first low frequency channel can be 40MHz, and the bandwidth of the first high frequency channel can be any one of 540MHz, 1080MHz, 2160MHz, and 4320MHz.

[0297] Example 3,

[0298] In the 802.11ac protocol, the subcarrier plan under 80MHz bandwidth is shown as follows: containing 256 subcarriers, the index values of which are defined in turn as -128:127. Among them, the subcarriers with index values of -1, 0, 1 are direct current subcarriers, carrying a value of 0; the subcarriers with index values of -128:-123 and 123:127 are guard subcarriers, i.e. [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127], carrying a value of 0; the subcarriers with index values of [-103, -75, -39, -11, 11, 39, 75, 103] are pilot subcarriers, carrying a value of +1 / -1; the rest are data subcarriers. The pilot subcarriers in the 802.11ac shown here are the second pilot subcarriers shown in the embodiments of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0299] As to the relationship between the pilot subcarriers in the high-frequency channel and the data subcarriers in the low-frequency channel, the relationship with the pilot subcarriers in the low-frequency channel, and the relationship with the guard subcarriers in the low-frequency channel, reference can be made to the description in examples 1 and 2 above, which will not be repeated here. For example, the index value of the first pilot subcarrier can satisfy at least one of the following: the index value of the first pilot subcarrier is the same as the index value of the 1-11 second guard subcarriers described above; the index value of the first pilot subcarrier is the same as the index value of the 1-8 second pilot subcarriers described above. The position of the first pilot subcarrier shown in Table 5 can be determined based on the subcarrier spacing of the first high-frequency channel and the index value of the first pilot subcarrier. For another example, the index value of the first pilot subcarrier can satisfy at least one of the following: the index value of the first pilot subcarrier is the same as the index value of one or more second data subcarriers, and the index value of the first pilot subcarrier is the same as the index value of 1-8 second pilot subcarriers. The first pilot subcarrier shown in Table 6 can be understood as a reconfigured pilot subcarrier.

[0300] For example, Table 5 and Table 6 are index values of a first pilot subcarrier and a first guard subcarrier provided by the embodiments of the present application.

[0301] Table 5

[0302]

[0303]

[0304] It can be understood that, among the index values -128:127, in addition to 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 direct current subcarriers (index values of -1, 0, 1), the remaining index values are all index values of first data subcarriers.

[0305] Table 6

[0306]

[0307] It can be understood that, in addition to 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 direct current subcarriers (index values -1, 0, 1) in the index values -128:127, the remaining index values are the index values of the first data subcarriers.

[0308] For example 1 shown in the embodiment of the present application, the bandwidth of the first low frequency channel can be 80MHz, and the bandwidth of the first high frequency channel can be any one of 1080MHz, 2160MHz, 4320MHz, 8640MHz.

[0309] Example 4,

[0310] In the 802.11ax protocol, the subcarrier plan under 20MHz bandwidth is as follows: containing 256 subcarriers, the index values are defined as -128:127 in turn. Among them, the subcarriers with index values -1, 0, 1 are direct current subcarriers, carrying values 0; the subcarriers with index values -128:-123 and 123:127 are guard subcarriers, that is, [-128,-127,-126,-125,-124,-123,123,124,125,126,127], carrying values 0; the subcarriers with index values [-116,-90,-48,-22,22,48,90,116] are pilot subcarriers, carrying values +1 / -1; the rest are data subcarriers. The pilot subcarriers in 802.11ax shown here are the second pilot subcarriers shown in the embodiment of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0311] Regarding the relationship between the pilot subcarriers in the high frequency channel and the data subcarriers in the low frequency channel, the relationship with the pilot subcarriers in the low frequency channel, and the relationship with the guard subcarriers in the low frequency channel, please refer to the description in examples 1 to 3 above, which will not be repeated here. The positions of the first pilot subcarriers shown in Table 7 can be determined based on the subcarrier spacing of the first high frequency channel and the index values of the first pilot subcarriers. The first pilot subcarriers shown in Table 8 can be understood as reconfigured pilot subcarriers.

[0312] For example, Table 7 and Table 8 are index values of the first pilot subcarriers and the first guard subcarriers provided by the embodiment of the present application.

[0313] Table 7

[0314]

[0315] It can be understood that, in the index values -128:127, in addition to the index values of the first pilot subcarriers shown in Table 7, the index values of the first guard subcarriers shown in Table 7, and the direct current subcarriers (index values -1, 0, 1), the remaining index values are index values of the first data subcarriers.

[0316] Table 8

[0317]

[0318]

[0319] It can be understood that, in the index values -128:127, in addition to the index values of the first pilot subcarriers shown in Table 8, the index values of the first guard subcarriers shown in Table 8, and the direct current subcarriers (index values -1, 0, 1), the remaining index values are index values of the first data subcarriers.

[0320] For example 4 shown in the embodiment of the present application, the bandwidth of the first low frequency channel can be 20MHz, and the bandwidth of the first high frequency channel can be any one of 1080MHz, 2160MHz.

[0321] Example 5,

[0322] In the 802.11ax protocol, the subcarrier plan under the 40MHz bandwidth is as follows: containing 512 subcarriers, the index values are defined as -256:255 in turn. Among them, the subcarriers with index values -2, -1, 0, 1, 2 are direct current subcarriers, carrying values 0; the subcarriers with index values -256:-245 and 245:255 are guard subcarriers, that is, [-256,-255,-254,-253,-252,-251,-250,-249,-248,-247,-246,-245,245,246,247,248,249,250,251,252,253,254,255], carrying values 0; the subcarriers with index values [-238,-212,-170,-144,-104,-78,-36,-10,10,36,78,104,144,170,212,238] are pilot subcarriers, carrying values +1 / -1; the rest are data subcarriers. The pilot subcarriers in 802.11ax shown here are the second pilot subcarriers shown in the embodiment of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0323] 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 low frequency channel, and the relationship between the guard subcarriers in the low frequency channel can refer to the descriptions in examples 1 to 4, and will not be repeated here. The positions of the first pilot subcarriers shown in Table 9 can be determined based on the subcarrier spacing of the first high frequency channel and the index values of the first pilot subcarriers. The first pilot subcarriers shown in Table 10 can be understood as reconfigured pilot subcarriers.

[0324] For example, Table 9 and Table 10 are index values of the first pilot subcarriers and the first guard subcarriers provided by the embodiments of the present application.

[0325] Table 9

[0326]

[0327] It can be understood that, in the index values -256:255, in addition to 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 direct current subcarriers (index values -2, -1, 0, 1, 2), the remaining index values are index values of the first data subcarriers.

[0328] Table 10

[0329]

[0330] It can be understood that, in the index values -256:255, in addition to 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 direct current subcarriers (index values -2, -1, 0, 1, 2), the remaining index values are index values of the first data subcarriers.

[0331] For example 5 shown in the embodiments of the present application, the bandwidth of the first low frequency channel can be 40MHz, and the bandwidth of the first high frequency channel can be any one of 1080MHz, 2160MHz, and 4320MHz.

[0332] Example 6,

[0333] In the 802.11ax protocol, the subcarrier plan under 80MHz bandwidth is as follows: containing 1024 subcarriers, the index values are defined in turn as -512:511. Among them, the subcarriers with index values of -2, -1, 0, 1, 2 are direct current subcarriers, carrying a value of 0; the subcarriers with index values of -512:-501 and 501:511 are guard subcarriers, 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], carrying a value of 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, carrying a value of +1 / -1; the rest are data subcarriers. The pilot subcarriers in the 802.11ax shown here are the second pilot subcarriers shown in the embodiments of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0334] As for the relationship between the pilot subcarriers in the high-frequency channel and the data subcarriers in the low-frequency channel, the relationship with the pilot subcarriers in the low-frequency channel, and the relationship with the guard subcarriers in the low-frequency channel, reference can be made to the descriptions in examples 1 to 5 above, which will not be repeated here. The positions of the first pilot subcarriers shown in Table 11 can be determined based on the subcarrier spacing of the first high-frequency channel and the index values of the first pilot subcarriers. The first pilot subcarriers shown in Table 12 can be understood as reconfigured pilot subcarriers.

[0335] For example, Table 11 and Table 12 are index values of a first pilot subcarrier and a first guard subcarrier provided by the embodiments of the present application.

[0336] Table 11

[0337]

[0338]

[0339] It can be understood that, among the index values -512:511, in addition to the index values of the first pilot subcarriers shown in Table 11, the index values of the guard subcarriers corresponding to the first pilot subcarriers shown in Table 11, and the direct current subcarriers (index values -2, -1, 0, 1, 2), the remaining index values are the index values of the data subcarriers corresponding to the first pilot subcarriers.

[0340] Table 12

[0341]

[0342]

[0343] It can be understood that, in addition to 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 direct current subcarriers (index values -2, -1, 0, 1, 2) in the index values -256: 255, the remaining index values are the index values of the first data subcarriers.

[0344] For example 6 shown in the embodiments of the present application, the bandwidth of the first low frequency channel can be 80MHz, and the bandwidth of the first high frequency channel can be any one of 4320MHz, 8640MHz.

[0345] Example 7,

[0346] In the 802.11be protocol, the subcarrier plan under 80MHz bandwidth is as follows: containing 1024 subcarriers, the index values are defined as -512: 511 in turn. Among them, the subcarriers with index values -2, -1, 0, 1, 2 are direct current subcarriers, carrying a value of 0; the subcarriers with index values -512: -501 and 501: 511 are guard subcarriers, carrying a value of 0; the subcarriers with index values [-468, -400, -334, -266, -220, -152, -86, -18, 18, 86, 152, 220, 266, 334, 400, 468] are pilot subcarriers, carrying a value of +1 / -1; the rest are data subcarriers. The pilot subcarriers in 802.11be shown here are the second pilot subcarriers shown in the embodiments of the present application, the guard subcarriers shown here are the guard subcarriers corresponding to the second pilot subcarriers, and the data subcarriers shown here are the data subcarriers corresponding to the second pilot subcarriers.

[0347] Regarding the relationship between the pilot subcarriers in the high frequency channel and the data subcarriers in the low frequency channel, the relationship with the pilot subcarriers in the low frequency channel, and the relationship with the guard subcarriers in the low frequency channel, please refer to the description in examples 1 to 6 above, which will not be repeated here. The positions of the first pilot subcarriers shown in Table 13 can be determined based on the subcarrier spacing of the first high frequency channel and the index values of the first pilot subcarriers. The first pilot subcarriers shown in Table 14 can be understood as reconfigured pilot subcarriers.

[0348] For example, Table 13 and Table 14 are index values of the first pilot subcarriers and the first guard subcarriers provided by the embodiments of the present application.

[0349] Table 13

[0350]

[0351]

[0352] It can be understood that, in the index values -512:511, in addition to 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 direct current subcarriers (index values -2, -1, 0, 1, 2), the remaining index values are the index values of the first data subcarriers.

[0353] Table 14

[0354]

[0355]

[0356] It can be understood that, in the index values -512:511, in addition to 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 direct current subcarriers (index values -2, -1, 0, 1, 2), the remaining index values are the index values of the first data subcarriers.

[0357] For example 7 shown in the embodiment of the present application, the bandwidth of the first low frequency channel can be 80MHz, and the bandwidth of the first high frequency channel can be any one of 4320MHz, 8640MHz.

[0358] It can be understood that the description of 20MHz and 40MHz in the 802.11be protocol can refer to the relevant description of 20MHz (such as Tables 7 and 8) and 40MHz (such as Tables 9 and 10) in the 802.11ax protocol described above, which will not be repeated here. The bandwidth in each of the examples shown above is only an example and should not be understood as a limitation of the embodiments of the present application. The places not described in detail in one of the examples shown above can refer to other examples.

[0359] Figure 4 is a simulation result schematic diagram provided by the embodiment of the present application. Figure 4 In the simulation diagram shown, the horizontal coordinate represents the received signal-to-noise ratio, and the vertical coordinate represents the packet error rate. The simulation is based on the inverse first behavior example shown in Table 5, that is, Figure 4 The index value of the current pilot subcarrier shown is [-103, -75, -39, -11, 11, 39, 75, 103], Figure 4The index values of the added pilot subcarriers are [-128, -127, -126, -125, -124, -123, -103, -75, -39, -11, 11, 39, 75, 103, 123, 124, 125, 126, 127]. From Figures 5 to 7 It can be seen that for the same PER, the PPDU generated by the first pilot subcarrier has less requirement for the external environment. When the PER reaches 10%, the required receiving SNR of the present scheme is reduced by 1dB.

[0360] In the embodiments of the present application, as for the above-mentioned example 1 to example 7, when the second guard subcarrier is used as the first pilot subcarrier, the guard subcarriers selected as the supplementary first pilot subcarriers no longer carry 0, but carry +1 or -1, for the signaling (SIG) part and the data part in the PPDU.

[0361] The SIG part of the PPDU can be different for different frame structures, such as for high throughput (HT) PPDU, the SIG part can be HT-SIG; for very high throughput (VHT) PPDU, the SIG part can be VHT-SIG-A, VHT-SIG-B; for high efficiency (HE) PPDU, the SIG part can be HE-SIG-A, HE-SIG-B; for extremely high throughput (EHT) PPDU, the SIG part can be EHT-SIG. It can be understood that the PPDU listed here is only an example, and as the standard develops, other structures of PPDU can appear in the future, and the pilot subcarriers used for the L-STF part, the L-LTF part, the SIG part and the data part in the PPDU also belong to the protection scope of the present application.

[0362] In the embodiments of the present application, the PPDU includes a legacy long training field (L-LTF), and can also include any one of the following: HT-LTF, VHT-LTF, HE-LTF, EHT-LTF. The LTF sequence can be divided into a 1x sequence, a 2x sequence, and a 4x sequence. The LTF 1x sequence indicates that there are at least 3 zeros between two non-zero elements, the LTF 2x sequence indicates that there are at least 1 zero between two non-zero elements, and the LTF 4x sequence indicates that there are consecutive non-zero elements, wherein the non-zero elements of the LTF 4x sequence are the most dense, and thus the estimation of the channel 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, and in the embodiments 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, and in the 802.11ac protocol, the value carried by the subcarrier with the index value of -123 is 0; however, in the embodiments of the present application, the value carried by the subcarrier with the 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, and in the 802.11ac protocol, the values carried by the subcarriers with the index values of -125, -124, -123, 123, and 124 are 0; however, in the embodiments of the present application, the values carried by the subcarriers with the index values of -125, -124, -123, 123, and 124 can be [1-1-1-1-1] in turn. That is, the sending end can adaptively modify the values of the sequence carried by the LTF based on the PAPR, such as modifying the values of part of the sequence carried by the LTF.

[0363] PAPR can be referred to as peak to average ratio, and for a signal sequence, PAPR refers to the ratio of the instantaneous power peak value of the signal to the average value of the signal power, which can be expressed by the following formula:

[0364]

[0365] wherein X i represents the time domain discrete value of a signal in the signal sequence; 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 value 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 value of the signal power.

[0366] It is known that OFDM adopts frequency domain equalization technology, and therefore the accuracy of channel estimation has a great influence on communication performance. However, the OFDM system has the disadvantage of high PAPR, especially under a large bandwidth, more subcarriers result in more serious PAPR, and high PAPR will lead to signal nonlinear distortion and reduce system performance. Therefore, in order to make the channel estimation more accurate, low PAPR is an important indicator for LTF sequence design. Because the signal transmission mode (P matrix, R matrix) of the pilot subcarrier and the data subcarrier is different, the position and number of the pilot subcarrier will result in different PAPR of the LTF. However, by using the above first pilot subcarrier provided in the embodiments of the present application, not only can the receiving end have enough pilots for phase shift and / or frequency shift, but also the low PAPR of the LTF can be ensured.

[0367] Generally, the guard band composed of guard subcarriers is usually left for the transition band bandwidth of the filter. In the case that the out-of-band suppression and in-band flatness indicators are determined, the transition band bandwidth will affect the order of the filter, and the specific design is determined by the implementation. In the embodiments of the present application, because part of the guard subcarriers are converted into the first pilot subcarriers, there may be a case that the remaining guard band is not enough as the transition band bandwidth. Alternatively, the sending end can adjust the sample rate of the signal, i.e. the signal bandwidth, to be less than the bandwidth of the channel. Alternatively, the sample rate of the high frequency signal sent by the sending end is less than the sample rate of the bandwidth of the channel, to ensure sufficient guard bandwidth. For example, the part of the difference between the bandwidth of the channel and the signal bandwidth, together with the guard subcarriers which are not converted into pilot subcarriers, is used as the guard bandwidth. For another example, the difference between the bandwidth of the channel and the signal bandwidth is used as the guard bandwidth. Of course, the above-mentioned method of adjusting the sample rate is only an example. In the embodiments of the present application, when the sending end sends the PPDU through the first high frequency channel, the signal bandwidth of the PPDU is less than the bandwidth of the first high frequency channel. If the difference between the signal bandwidth and the bandwidth of the first high frequency channel is enough to leave as the guard bandwidth, the sending end can not adjust the sample rate on the basis of the above-mentioned method.

[0368] OFDM is the basic transmission method of current wireless communication, and is widely used in wireless communication systems such as LTE, WiMAX, WiFi, etc. Not only that, OFDM is further applied to fixed network transmission, such as optical fiber, copper twisted pair, cable transmission, etc. The basic principle of OFDM is to compress the subcarrier spacing to the minimum within the allowable range by using the orthogonality of subcarriers, which can not only ensure the formation of multiple parallel and non-interfering channels, but also improve the frequency utilization efficiency of the system. Further, due to the above characteristics of OFDM, if the non-interfering subcarriers of OFDM are allocated to multiple users, OFDM can be used to realize multi-user access or data transmission, which is orthogonal frequency division multiple access (OFDMA). Using OFDMA can realize parallel transmission of multi-user data, which is an effective way to improve data transmission concurrency. The 802.11ax protocol defines a resource unit (RU), and the 802.11be protocol further defines a multiple RU (MRU) composed of a fixed combination of multiple RUs. RUs less than 242-tone are called small RUs, and RUs greater than or equal to 242-tone are called large RUs. The combination of large RUs supported is different for OFDMA transmission and non-OFDMA transmission. Non-OFDMA supports a 996+484+242-tone RU, and the others are the same. Here, the others refer to the combination of large RUs supported. For example, 996+484, 2*996+484, etc., which are supported by both OFDMA and non-OFDMA. The distribution of RUs or MRUs under different bandwidths can refer to the relevant standards or protocols, which will not be described one by one here. For example, small RUs can include 26-tone RUs, 52-tone RUs, and 106-tone RUs.

[0369] As a possible implementation, the sending end can send signals according to the maximum resource unit (RU) of the corresponding bandwidth. For example, under the 20MHz bandwidth in 802.11be (which can refer to Tables 7 and 8 above), the sending end can send signals according to the 242-tone RU. For another example, under the 40MHz bandwidth in 802.11be (which can refer to Tables 9 and 10 above), it is considered to be sent according to the 484-tone RU. This implementation is suitable for a scheme in which the subcarrier spacing of the low-frequency signal is expanded to obtain a high-frequency signal and the number of pilots does not change, and is also suitable for a scheme in which the subcarrier spacing of the low-frequency signal is expanded to obtain a high-frequency signal and the number of pilots increases, such as Examples 1 to 7 shown above.

[0370] As another possible implementation, the transmitter can transmit a PPDU to one receiver through multiple small RUs (i.e., transmit a signal to one user through multiple small RUs). That is, the transmitter can replace the transmission of one maximum RU in the above implementation with the transmission of multiple small RUs. For example, for a 20 MHz bandwidth, instead of transmitting one 242-tone RU with 8 pilot subcarriers, the transmitter can transmit 9 26-tone RUs with 18 pilot subcarriers, or 4 52-tone RUs and 1 26-tone RU with 18 pilot subcarriers, or 2 106-tone RUs and 1 26-tone RU with 10 pilot subcarriers. Since the sum of the pilot subcarriers of the multiple small RUs is greater than the pilot subcarriers of the maximum RU, this implementation can also increase the number of pilot subcarriers.

[0371] It can be understood that when the bandwidth is 160 MHz or 80+80 MHz, the entire bandwidth can be regarded as a copy of two 80 MHz subcarrier distributions, and the entire bandwidth can be composed of one entire 2*996-tone RU, or 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+160 MHz, the entire bandwidth can be regarded as a copy of four 80 MHz subcarrier distributions. For the bandwidth of 160 MHz or 320 MHz and the combination of multiple small RUs, they are not listed one by one here. The changes of the pilot subcarriers when the bandwidth of the low-frequency band signal is 160 MHz and 320 MHz are not shown in the above examples 1 to 7. Of course, the first pilot subcarrier and / or the first guard subcarrier can also be designed based on 160 MHz or 80+80 MHz, respectively, and the embodiments of the present application will not be described one by one.

[0372] The communication apparatus provided by the embodiments of the present application will be described below.

[0373] The present application divides the functions of the communication apparatus according to the above method embodiments, for example, each function module can be divided according to each function, or two or more functions can be integrated into one processing module. The above integrated module can be realized in the form of hardware or in the form of a software function module. It should be noted that the division of the modules in the present application is illustrative, and is only a logical function division. When actually implemented, another division mode can be used. The communication apparatus of the embodiments of the present application will be described below. Figure 5 The communication apparatus of the embodiments of the present application will be described below.

[0374] Figure 5 is a structural schematic diagram of a communication apparatus provided by an embodiment of the present application, as shown in the figure, the communication apparatus comprises a processing unit 501 and a transceiver unit 502. Figure 2

[0375] In some embodiments of the present application, the communication apparatus can be the sending end or the chip shown above, which can be arranged in the sending end. That is, the communication apparatus can be used to perform the steps or functions performed by the sending end in the above method embodiments.

[0376] The processing unit 501 is configured to generate a PPDU, and the transceiver unit 502 is configured to output the PPDU.

[0377] It can be understood that the specific description of the transceiver unit and the processing unit shown in the embodiments of the present application is only an example, and for the specific functions or steps performed by the transceiver unit and the processing unit, reference can be made to the above method embodiments, which will not be described in detail here. For example, the processing unit 501 can be used to perform step 201 as shown in the figure. The transceiver unit 502 can be used to perform the sending step in step 202 as shown in the figure. Figure 2 Figure 5

[0378] MultiplexingIn some other embodiments of the present application, the communication apparatus can be the receiving end or the chip shown above, which can be arranged in the receiving end. That is, the communication apparatus can be used to perform the steps or functions performed by the receiving end in the above method embodiments. Figure 2 The transceiver unit 502 is configured to input a PPDU, and the processing unit 501 is configured to process the PPDU.

[0379] For example, the processing unit 501 is specifically configured to obtain a pilot signal in the PPDU on a first pilot subcarrier corresponding to an index value of the first pilot subcarrier based on the index value of the first pilot subcarrier, and process based on the pilot signal. For another example, the processing unit 501 can be used to perform at least one of the following: phase offset estimation and / or compensation based on the pilot signal; frequency offset estimation and / or compensation based on the pilot signal.

[0380] It can be understood that the specific description of the transceiver unit and the processing unit shown in the embodiments of the present application is only an example, and for the specific functions or steps performed by the transceiver unit and the processing unit, reference can be made to the above method embodiments, which will not be described in detail here. For example, the transceiver unit 502 can also be used to perform the receiving step in step 202 as shown in the figure. The processing unit 501 can also be used to perform step 203 as shown in the figure.

[0381] Figure 2 Figure 5

[0382] ​​​​​In the above various embodiments, the descriptions about 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. can also refer to the descriptions in the above method embodiments, which will not be repeated here.

[0383] It can be understood that the above-mentioned division manners are only examples, and the division manners of the sending end (or the chip arranged at the sending end) and the receiving end (or the chip arranged at the receiving end) can also be as follows: the sending end can include a generation unit and a sending unit; the receiving end can include a receiving unit and a processing unit, which can include at least one of a pilot subunit, a channel estimation subunit, a time synchronization subunit, etc., which will not be listed one by one here. Optionally, the above-mentioned sending end and receiving end can also include a storage unit, which can be used to store the index values shown above. Alternatively, the storage unit can be used 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.

[0384] The above introduces the first communication device and the second communication device of the embodiments of the present application, and the possible product forms of the first communication device and the second communication device are introduced below. It should be understood that any form of product that has the functions of the above-mentioned Figure 5 first communication device, or any form of product that has the functions of the above-mentioned Figure 5 second communication device, falls within the protection scope of the embodiments of the present application. It should also be understood that the following introduction is only an example, and the product form of the first communication device and the second communication device of the embodiments of the present application is not limited to this.

[0385] In a possible implementation manner, Figure 6 In the above-mentioned communication device, the processing unit 501 can be one or more processors, the transceiver unit 502 can be a transceiver, or the transceiver unit 502 can also be a sending unit and a receiving unit, the sending unit can be a transmitter, and the receiving unit can be a receiver, and the sending unit and the receiving unit are integrated in one device, such as a transceiver. In the embodiments of the present application, the processor and the transceiver can be coupled, etc., and the connection manner of the processor and the transceiver is not limited in the embodiments of the present application.

[0386] As Figure 5 shown, the communication device 60 includes one or more processors 620 and a transceiver 610.

[0387] For example, when the communication device is used to perform the steps or methods or functions performed by the above-mentioned sending end, the processor 620 is configured to generate a PPDU; and the transceiver 610 is configured to send the PPDU.

[0388] Exemplarily, when the communication apparatus is configured to perform the steps or methods or functions performed by the receiving end, the transceiver 610 is configured to receive the PPDU from the transmitting end; and the processor 620 is configured to process according to the M sequences carried in the PPDU.

[0389] In embodiments of the present application, 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. can also refer to the descriptions in the above method embodiments, which will not be repeated here.

[0390] It can be understood that the specific descriptions of the processor and the transceiver can also refer to the descriptions of the processing unit and the transceiving unit shown in Figure 6 , which will not be repeated here.

[0391] In Figure 6 each implementation mode of the communication apparatus shown, the transceiver can include a receiver configured to perform the functions (or operations) of receiving and a transmitter configured to perform the functions (or operations) of transmitting, and the transceiver is configured to communicate with other devices / apparatuses through a transmission medium.

[0392] Optionally, the communication apparatus 60 can further include one or more memories 630 configured to store program instructions and / or data, etc. The memory 630 is coupled with the processor 620. The coupling in embodiments of the present application is indirect coupling or communication connection between devices, units or modules, which can be electrical, mechanical or other forms, and is used for information interaction between devices, units or modules. The processor 620 can operate in cooperation with the memory 630. The processor 620 can execute the program instructions stored in the memory 630. Optionally, at least one of the one or more memories can be included in the processor. Exemplarily, the memory can be configured to store the various index values shown above. Exemplarily, the memory can be configured to store at least one of the following: 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.

[0393] The specific connection medium between the transceiver 610, the processor 620 and the memory 630 in embodiments of the present application is not limited. In Figure 6 embodiments of the present application, the memory 630, the processor 620 and the transceiver 610 are connected through a bus 640, and the bus is represented by a thick line in Figure 6 , and the connection modes between other components are only schematically illustrated and are not limited. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 6 only one thick line is used in

[0394] In the embodiments of the present application, the processor can be a general processor, a digital signal processor, an application specific integrated circuit, a field programmable gate array or other programmable logic device, a discrete gate or transistor logic device, a discrete hardware component, etc., which can implement or execute the disclosed methods, steps and logic block diagrams in the embodiments of the present application. The general processor can be a microprocessor or any conventional processor, etc. The steps of the method disclosed in combination with the embodiments of the present application can be directly embodied as execution completed by a hardware processor, or executed by a combination of hardware and software modules in the processor, etc.

[0395] In the embodiments of the present application, the memory can include, but is not limited to, a non-volatile memory such as a hard disk drive (HDD) or a solid-state drive (SSD), a random access memory (RAM), an erasable programmable ROM (EPROM), a read-only memory (ROM) or a compact disc read-only memory (CD-ROM), etc. The memory can be any storage medium capable of carrying or storing program codes in the form of instructions or data structures and capable of being read and / or written by a computer (such as the communication device shown in the present application, etc.), but is not limited thereto. The memory in the embodiments of the present application can also be a circuit or any other device capable of realizing a storage function, used for storing program instructions and / or data.

[0396] For example, the processor 620 is mainly used for processing communication protocols and communication data, controlling the whole communication device, executing software programs, and processing data of the software programs. The memory 630 is mainly used for storing software programs and data. The transceiver 610 can include a control circuit and an antenna, and the control circuit is mainly used for converting baseband signals and radio frequency signals and processing the radio frequency signals. The antenna is mainly used for transmitting and receiving radio frequency signals in the form of electromagnetic waves. The input and output device, such as a touch screen, a display screen, a keyboard, etc., is mainly used for receiving user input data and outputting data to the user.

[0397] When the communication apparatus is powered on, the processor 620 can read a software program in the memory 630, interpret and execute instructions of the software program, and process data of the software program. When data needs to be transmitted wirelessly, the processor 620 outputs a baseband signal to the radio frequency circuit after baseband processing of the data to be transmitted, and the radio frequency circuit converts the baseband signal into a radio frequency signal and transmits the radio frequency signal in the form of an electromagnetic wave through the antenna. When data is transmitted to the communication apparatus, the radio frequency circuit receives a radio frequency signal through the antenna, converts the radio frequency signal into a baseband signal, and outputs the baseband signal to the processor 620, and the processor 620 converts the baseband signal into data and processes the data.

[0398] 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 arranged remotely from the communication apparatus.

[0399] It can be understood that the communication apparatus shown in the embodiments of the present application can also have more components and the like, which are not limited in the embodiments of the present application. The methods performed by the processor and the transceiver shown above are only examples, and the specific steps performed by the processor and the transceiver can refer to the methods introduced above. Figure 5

[0400] In another possible implementation, Figure 7 In the communication apparatus shown, the processing unit 501 can be one or more logic circuits, and the transceiving unit 502 can be an input output interface, also referred to as a communication interface, or an interface circuit, or an interface, and the like. Alternatively, the transceiving unit 502 can also be a transmitting unit and a receiving unit, the transmitting unit can be an output interface, and the receiving unit can be an input interface, and the transmitting unit and the receiving unit are integrated in one unit, for example, an input output interface. For example, Figure 7 As shown, Figure 7 The communication apparatus shown includes a logic circuit 701 and an interface 702. That is, the above-mentioned processing unit 501 can be implemented by the logic circuit 701, and the transceiving unit 502 can be implemented by the interface 702. The logic circuit 701 can be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, and the interface 702 can be a communication interface, an input output interface, a pin, and the like. For example, Figure 7 The above-mentioned communication apparatus is taken as an example of a chip, which includes a logic circuit 701 and an interface 702.

[0401] In the embodiments of the present application, the logic circuit and the interface can also be coupled to each other. The specific connection mode of the logic circuit and the interface is not limited in the embodiments of the present application.

[0402] ​Exemplarily, when the communication apparatus is configured to perform the method or function or step performed by the sending end, the logic circuit 701 is configured to generate the PPDU; and the interface 702 is configured to output the PPDU.

[0403] Exemplarily, when the communication apparatus is configured to perform the method or function or step performed by the receiving end, the interface 702 is configured to input the PPDU; and the logic circuit 701 is configured to process the PPDU.

[0404] Optionally, the chip can further include a memory, which can be configured to store the index values shown in the above. Exemplarily, the memory can be configured to store at least one of the following: 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 can also be arranged outside the chip, for example, the chip can obtain the index values from the memory connected thereto.

[0405] It can be understood that the communication apparatus shown in the embodiments of the present application can implement the method provided by the embodiments of the present application in the form of hardware, or implement the method provided by the embodiments of the present application in the form of software, and the embodiments of the present application do not limit this.

[0406] In the embodiments of the present application, 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, and the like can also refer to the descriptions in the method embodiments, which will not be repeated here.

[0407] For the specific implementation of each embodiment shown in the above, it can also refer to the above embodiments, which will not be repeated here. Figure 2

[0408] The embodiments of the present application further provide a wireless communication system, which includes a sending end and a receiving end, and the sending end and the receiving end can be configured to perform the method in any one of the above embodiments (for example, the method in the embodiment 1). ​

[0409] In addition, the present application further provides a computer program, which is configured to implement the operations and / or processes performed by the sending end in the method provided by the present application.

[0410] The present application further provides a computer program, which is configured to implement the operations and / or processes performed by the receiving end in the method provided by the present application.

[0411] The present application further provides a computer readable storage medium, which stores computer codes, and when the computer codes are run on a computer, the computer is caused to perform the operations and / or processes performed by the sending end in the method provided by the present application. ​​

[0412] The application further provides a computer readable storage medium, wherein computer code is stored in the computer readable storage medium, and when the computer code is run on a computer, the computer code causes the computer to perform operations and / or processes performed by a receiving end in the method provided by the application.

[0413] The application further provides a computer program product, which comprises computer code or a computer program, and when the computer code or the computer program is run on a computer, operations and / or processes performed by a sending end in the method provided by the application are performed.

[0414] The application further provides a computer program product, which comprises computer code or a computer program, and when the computer code or the computer program is run on a computer, operations and / or processes performed by a receiving end in the method provided by the application are performed.

[0415] In several embodiments provided in the application, it should be understood that the disclosed system, device and method can be implemented in other manners. For example, the described device embodiments are merely schematic, and the division of units is merely a logical function division, and there can be another division manner in actual implementation, for example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed coupling or direct coupling or communication connection between units can be indirect coupling or communication connection through some interfaces, devices or units, and can also be electrical, mechanical or other forms of connection.

[0416] The units described as separate components can or can not be physically separate, and the components displayed as units can or can not be physical units, that is, can be located in one place, or can be distributed on a plurality of network units. According to actual needs, some or all of the units can be selected to achieve the technical effects of the scheme provided in the embodiments of the application.

[0417] In addition, each functional unit in the various embodiments of the application can be integrated in one processing unit, or each unit can be a physically independent unit, or two or more units can be integrated in one unit. The integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

[0418] The integrated unit, if implemented in the form of a software function unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or say the part that contributes to the prior art, or the whole or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a readable storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in various embodiments of the present application. The aforementioned readable storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and various media that can store program codes.

[0419] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method of communicating based on physical layer protocol data units (PPDUs), characterized by, The method comprises: generating the PPDU; sending the PPDU on a first high-frequency channel, the first high-frequency channel comprising first pilot subcarriers and first data subcarriers, the first high-frequency channel corresponding to a discrete Fourier transform (DFT) size same as that of a first low-frequency channel, and the number of the first pilot subcarriers being greater than that of second pilot subcarriers in the first low-frequency channel, and the number of the first data subcarriers being equal to that of second data subcarriers in the first low-frequency channel.

2. A method of communicating based on physical layer protocol data units (PPDUs), characterized by, The method comprises: receiving the PPDU on a first high-frequency channel, the first high-frequency channel comprising first pilot subcarriers and first data subcarriers, the first high-frequency channel corresponding to a discrete Fourier transform (DFT) size same as that of a first low-frequency channel, and the number of the first pilot subcarriers being greater than that of second pilot subcarriers in the first low-frequency channel, and the number of the first data subcarriers being equal to that of second data subcarriers in the first low-frequency channel; processing the PPDU.

3. The method of claim 2, wherein, The processing of the PPDU comprises: acquiring, based on an index value of the first pilot subcarrier, a pilot signal in the PPDU on the first pilot subcarrier corresponding to the index value; processing based on the pilot signal.

4. The method of claim 3, wherein, The processing based on the pilot signal comprises at least one of: estimation and / or compensation of phase offset based on the pilot signal; estimation and / or compensation of frequency offset based on the pilot signal.

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

6. The method of claim 5, wherein, The index value of the first pilot subcarrier comprises at least one of: an index value of the second guard subcarrier, and an index value of the second pilot subcarrier.

7. The method according to any one of claims 1 to 6, characterized in that, The index value of the first pilot subcarrier comprises at least one of: [-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]； [-32,-31,-30, -29, -21, -7, 7, 21,29,30,31]； wherein [-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.

8. The method according to any one of claims 1 to 6, characterized in that, The index value of the first pilot subcarrier comprises at least one of: [-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]； [-64, -63, -62,-61, -60, -59, -53, -25, -11,11, 25, 53, 59, 60, 61, 62,63]； wherein [-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.

9. The method according to any one of claims 1 to 6, characterized in that, The index value of the first pilot subcarrier comprises at least one of: [-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]； [-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.

10. The method according to any one of claims 1 to 6, characterized in that, The index value of the first pilot subcarrier comprises at least one of: [-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]； [-128, -127, -126, -125, -124, -123, -116, -90, -48, -22, 22, 48, 90,116, 123, 124, 125, 126, 127]； The index values of the first pilot subcarriers include at least one of the following: [-116, -90, -45, -22, 22, 48, 90, 116] are the same as the index values of the second pilot subcarriers, and [-128, -127, -126, -125, -124, -123, 123, 124, 125, 126, 127] are the same as the index values of the second guard subcarriers.

11. The method according to any one of claims 1 to 6, characterized in that, The index values of the first pilot subcarriers include at least one of the following: [-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]； [-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]； The index values of the first pilot subcarriers include at least one of the following: [-238, -212, -170, -144, -104, -78, -36, -10, 10, 36, 78, 104, 144, 170, 212, 238] are the same as the index values of the second pilot subcarriers, and [-256, -255, -254, -253, -252, -251, -250, -249, -248, -247, -246, -245, 245, 246, 247, 248, 249, 250, 251, 252, 253, 254, 255] are the same as the index values of the second guard subcarriers.

12. The method according to any one of claims 1 to 6, characterized in that, The index values of the first pilot subcarriers include at least one of the following: [-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]； [-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]； The index values of the first pilot subcarriers include at least one of the following: [-468, -400, -334, -266, -226, -158, -92, -24, 24, 92, 158, 226, 266, 334, 400, 468] are the same as the index values of the second pilot subcarriers, 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] are the same as the index values of the second guard subcarriers.

13. The method according to any one of claims 1 to 6, characterized in that, The index values of the first pilot subcarriers include at least one of the following: [-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]； [-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]； Wherein, [–468, –400, –334, –266, –220, –152, –86, –18, 18, 86, 152, 220,266, 334, 400, 468] are the same as the index values of the second pilot subcarriers, 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] are the same as the index values of the second guard subcarriers.

14. The method according to any one of claims 1 to 4, characterized in that, The first pilot subcarriers are obtained by mapping the second data subcarriers in the first low-frequency channel into the first high-frequency channel; or, the first pilot subcarriers are obtained by mapping the second pilot subcarriers and the second data subcarriers into the first high-frequency channel.

15. The method of claim 14, wherein, The index values of the first pilot subcarriers include at least one of the following: [-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]； [-28, -23, -18, -13, -8, -3, 3, 8, 13, 18, 23]； Or, the index values of the first pilot subcarriers include at least one of the following: [-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]； [-58, -52, -46, -40, -34, -28, -22, -16, -10, -4, 4, 10, 16, 22, 28, 34,40, 46, 52]； Or, the index values of the first pilot subcarriers include at least one of the following: [-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]； [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54,66, 78, 90, 102]； Or, the index values of the first pilot subcarriers include at least one of the following: [-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]； [-114, -102, -90, -78, -66, -54, -42, -30, -18, -6, 6, 18, 30, 42, 54,66, 78, 90, 102]； Or, the index values of the first pilot subcarriers include at least one of the following: [-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]； [-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 values of the first pilot subcarriers include at least one of the following: [-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, 375425, 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, 171209, 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]； [-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 values of the first pilot subcarriers include at least one of the following: [-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]； [-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 method according to any one of claims 1 to 15, characterized in that, Or, the index values of the first pilot subcarriers include at least one of the following: The bandwidth of the first low-frequency channel includes at least one of the following: 20MHz, 40MHz, 80MHz; 17. A communications device, characterized by The bandwidth of the first high-frequency channel includes at least one of the following: 270MHz, 320MHz, 540MHz, 1080MHz, 2160MHz, 4320MHz, 8640MHz. The apparatus includes: A processing unit configured to generate a physical layer protocol data unit (PPDU); 18. A communications device, characterized by A transceiving unit configured to transmit the PPDU on a first high-frequency channel, the first high-frequency channel including first pilot subcarriers and first data subcarriers, the first high-frequency channel corresponding to a discrete Fourier transform (DFT) size that is the same as a DFT size corresponding to a first low-frequency channel, and the number of the first pilot subcarriers being greater than the number of second pilot subcarriers in the first low-frequency channel, and the number of the first data subcarriers being equal to the number of second data subcarriers in the first low-frequency channel. The apparatus includes: a transceiving unit, configured to receive a PPDU on a first high-frequency channel, the first high-frequency channel comprising first pilot subcarriers and first data subcarriers, the first high-frequency channel corresponding to a same discrete Fourier transform (DFT) size as a first low-frequency channel, and a number of the first pilot subcarriers being greater than a number of second pilot subcarriers in the first low-frequency channel, and a number of the first data subcarriers being equal to a number of second data subcarriers in the first low-frequency channel; a processing unit, configured to process the PPDU.

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

20. The apparatus of claim 19, wherein, The processing unit is specifically configured to perform at least one of the following: performing estimation and / or compensation of phase offset based on the pilot signal; performing estimation and / or compensation of frequency offset based on the pilot signal.

21. A communications device, characterized by comprising a processor and a memory; the memory is configured to store instructions; the processor is configured to execute the instructions to cause the method in any one of claims 1 to 16 to be performed.

22. A communications device, characterized by comprising a logic circuit and an interface, the logic circuit and the interface being coupled; the interface is configured to input and / or output code instructions, and the logic circuit is configured to execute the code instructions to cause the method in any one of claims 1 to 16 to be performed.

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

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