Communication method, communication apparatus, chip, computer readable storage medium, and computer program product

Abstract

The present application relates to the technical field of wireless communications, and in particular to a communication method, a communication apparatus, a chip, a computer readable storage medium, and a computer program product. The present application provides multiple conditions that a pilot subcarrier in subcarrier planning corresponding to a first discrete bandwidth should meet, and the pilot design is conducive to improvement of communication performance and / or reduction of storage overhead. The present application can support IEEE protocols such as the IEEE 802.11be / WiFi 7 / EHT protocol, the IEEE 802.11bn / UHR / WiFi 8 protocol, and IEEE 802.15 / UWB protocol, the IEEE 802.11bf / sensing protocol, and the millimeter wave (MMW) protocol.

Description

Communication method, communication apparatus, chip, computer readable storage medium and computer program product

[0001] This application claims priority to the Chinese patent application No. 202410541307.6, filed on April 26, 2024, with the State Intellectual Property Office of China, entitled "Communication method, communication apparatus, chip, computer readable storage medium and computer program product", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of communication, and in particular to a communication method, a communication apparatus, a chip, a computer readable storage medium and a computer program product. BACKGROUND

[0003] European Telecommunications Standards Institute (ETSI) has issued regulations on 6GHz spectrum, which limits the maximum power of transmission to 23dBm (decibel-milliwatts) and the maximum power spectral density to 10dBm / MHz (decibel-milliwatts / megahertz). The United States Federal Communications Commission has also issued regulations on 6GHz spectrum, which defines a low power indoor (LPI) communication method and strictly limits the maximum power and maximum power spectral density of transmission. For access points (APs), the maximum power of transmission is limited to 30dBm, and the maximum power spectral density is limited to 5dBm / MHz. For stations (STAs), the maximum power of transmission is limited to 24dBm, and the maximum power spectral density is limited to -1dBm / MHz. The transmission power of a device (such as an AP and a station) is limited by both the maximum power and the maximum power spectral density, i.e., the transmission power cannot exceed the maximum power value, and the power spectral density (PSD) of transmission cannot exceed the maximum power spectral density. Compared with the maximum power, the maximum power spectral density is more strictly limited, and the maximum power allowed for transmission is usually more limited by the power spectral density. For a station, when the bandwidth is 320MHz, the transmission power of the station reaches the limit of the specified maximum power. When the bandwidth is less than 320MHz, because of the limitation of the maximum power spectral density, the station can only transmit at a lower power (here, the power is lower than the specified maximum power).

[0004] Based on this, a distributed resource unit (DRU) technology is proposed to improve the transmission power of the device. The basic idea of the DRU is to disperse the continuous subcarriers in a resource unit (RU) to the widest bandwidth possible to reduce the number of subcarriers existing in 1MHz, thereby realizing the increase of the transmission power of each subcarrier, and further improving the total transmission power. Compared with the regular RU (rRU), the DRU occupies a larger bandwidth and has a higher transmission power. For each size of the DRU, the number of pilot subcarriers is the same as that of the rRU. The 26-tone DRU contains 2 pilot subcarriers; the 52-tone DRU contains 4 pilot subcarriers; the 106-tone DRU contains 4 pilot subcarriers; the 242-tone DRU contains 8 pilot subcarriers; and the 484-tone DRU contains 16 pilot subcarriers.

[0005] For the DRU, the design of the pilot subcarriers in the tone plan will affect the communication performance and / or storage overhead of the device. Therefore, how to design the pilot in the tone plan of the DRU has become a problem to be solved. SUMMARY

[0006] Embodiments of the present application provide a communication method, a communication device, a chip, a computer readable storage medium and a computer program product. By limiting the conditions that the pilot subcarriers in the tone plan should satisfy, the communication performance is improved and / or the storage overhead is reduced.

[0007] In a first aspect, an embodiment of the present application provides a communication method, which comprises: transmitting or receiving (orthogonal frequency division multiplexing, OFDM) symbols according to a subcarrier planning corresponding to a first discrete bandwidth; pilot subcarriers in the subcarrier planning satisfy the following conditions: each DRU includes subcarriers with an index greater than 0 and subcarriers with an index less than 0, the first and last subcarriers with an index greater than 0 are not pilot subcarriers, and the first and last subcarriers with an index less than 0 are not pilot subcarriers, because the first and last subcarriers with an index greater than 0 or less than 0 cannot obtain a smoothing filtering gain, thereby avoiding that the pilot subcarriers cannot obtain a smoothing filtering gain; the difference between the indices of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11, thereby avoiding that the pilot subcarriers are clustered and affected by narrowband interference at the receiving end; the part of the indices of the pilot subcarriers less than 0 and the part of the indices of the pilot subcarriers greater than 0 are opposite numbers of each other, or each index of the pilot subcarriers less than 0 and each index of the pilot subcarriers greater than 0 are opposite numbers of each other, thereby the storage and reading of the pilot subcarriers can reuse the scheme for storing and reading a regular RU (rRU), and there is no need to redesign the scheme for storing and reading the pilot subcarriers.

[0008] In a possible implementation, the first discrete bandwidth is 20 MHz, the minimum index of the subcarriers in the DRU contained in the first discrete bandwidth is -120, and the maximum index is 120; or the first discrete bandwidth is 40 MHz, the minimum index of the subcarriers in the DRU contained in the first discrete bandwidth is -244, and the maximum index is 244; or the first discrete bandwidth is 80 MHz, the minimum index of the subcarriers in the DRU contained in the first discrete bandwidth is -499, and the maximum index is 500. The minimum index and the maximum index of the subcarriers contained in the first discrete bandwidth are the same as the minimum index and the maximum index in the existing subcarrier planning, thereby the pilot subcarriers in the existing subcarrier planning can satisfy the above conditions, and there is no need to redesign the subcarrier planning.

[0009] In a possible implementation, the first discrete bandwidth is 20 MHz, the first discrete bandwidth contains DRUs with a subcarrier index range (that is, a subcarrier index range) of [-120:9:-12, 6:9:114]; the first discrete bandwidth is 40 MHz, the first discrete bandwidth contains DRUs with a subcarrier index range of [-242:18:-26, 10:18:226]; and the first discrete bandwidth is 80 MHz, the first discrete bandwidth contains DRUs with a subcarrier index range of [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465].

[0010] In a possible implementation, the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is equal to 11; the first discrete bandwidth comprises a plurality of first DRUs, each first DRU containing 26 subcarriers, and each first DRU containing two pilot subcarriers whose indexes have an absolute difference of a first value, so that the index of a pilot subcarrier with an index less than 0 in each first DRU plus the first value can obtain the index of the other pilot subcarrier contained in the first DRU, and thus only the index of the pilot subcarrier with an index less than 0 needs to be stored, which can reduce storage overhead; or the first discrete bandwidth comprises a plurality of second DRUs, each second DRU containing 52 subcarriers, and each second DRU containing two groups of pilot subcarriers whose indexes have an absolute difference of a second value, each group containing two pilot subcarriers, so that the index of a pilot subcarrier with an index less than 0 in each group of pilot subcarriers contained in each second DRU plus the second value can obtain the index of the other pilot subcarrier in the group, and thus only the index of the pilot subcarrier with an index less than 0 needs to be stored, which can reduce storage overhead.

[0011] In a possible implementation, the first discrete bandwidth is 20 MHz, and the first value is 126; or the first discrete bandwidth is 40 MHz, and the first value is 252; or the first discrete bandwidth is 80 MHz, and the second value is 500.

[0012] In a possible implementation, the difference between the absolute indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11; the first discrete bandwidth comprises a plurality of first DRUs, each first DRU containing 26 subcarriers, and each first DRU containing two pilot subcarriers, and the relative indexes of the two pilot subcarriers contained in each first DRU have a difference of 13 or 14, so that the receiver (or receiving end) only needs to store the relative pilot indexes of one 26-tone DRU and the offset of the relative pilot indexes of other 26-tone DRUs relative to the 26-tone DRU, to find the pilots of all 26-tone DRUs, and thus the relative pilot indexes of each 26-tone DRU do not need to be stored respectively, thereby simplifying storage; or the first discrete bandwidth comprises a plurality of second DRUs, each second DRU containing 52 subcarriers, and each second DRU containing two groups of pilot subcarriers whose relative indexes have a difference of 13 or 14, each group containing two pilot subcarriers, so that the offset of the relative pilot indexes can be stored to simplify storage.

[0013] In a possible implementation, the first discrete bandwidth includes a plurality of first DRUs, each of the first DRUs contains 26 subcarriers, each of the first DRUs contains two pilot subcarriers, indexes of the two pilot subcarriers in each of the first DRUs correspond to same or 1-difference ordering values, an ordering value corresponding to an index of a first pilot subcarrier in each of the first DRUs is an ordering value of the index of the first pilot subcarrier in indexes of subcarriers contained in the first DRU and greater than 0, and an ordering value corresponding to an index of a second pilot subcarrier in each of the first DRUs is an ordering value of the index of the second pilot subcarrier in indexes of subcarriers contained in the first DRU and less than 0; thus, storage of only half (positive half or negative half) of relative pilot indexes can be performed, thereby simplifying storage.

[0014] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU9, and the DRU1 to DRU9 satisfy one or more of the following:

[0015] The DRU1 contains pilot subcarriers with indexes of -30 and 96;

[0016] The DRU2 contains pilot subcarriers with indexes of -107 and 19;

[0017] The DRU3 contains pilot subcarriers with indexes of -19 and 107;

[0018] The DRU4 contains pilot subcarriers with indexes of -96 and 30;

[0019] The DRU5 contains pilot subcarriers with indexes of -85 and 41;

[0020] The DRU6 contains pilot subcarriers with indexes of -74 and 52;

[0021] The DRU7 contains pilot subcarriers with indexes of -52 and 74;

[0022] The DRU8 contains pilot subcarriers with indexes of -63 and 63;

[0023] The DRU9 contains pilot subcarriers with indexes of -41 and 85.

[0024] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU18, and the DRU1 to DRU18 satisfy one or more of the following:

[0025] The DRU1 contains pilot subcarriers with indexes of -170 and 82;

[0026] The DRU2 contains pilot subcarriers with indexes of -71 and 181;

[0027] The DRU 3 contains pilot subcarriers with indices -148 and 104;

[0028] The DRU 4 contains pilot subcarriers with indices -49 and 203;

[0029] The DRU 5 contains pilot subcarriers with indices -27 and 225;

[0030] The DRU 6 contains pilot subcarriers with indices -60 and 192;

[0031] The DRU 7 contains pilot subcarriers with indices -159 and 93;

[0032] The DRU 8 contains pilot subcarriers with indices -38 and 214;

[0033] The DRU 9 contains pilot subcarriers with indices -137 and 115;

[0034] The DRU 10 contains pilot subcarriers with indices -115 and 137;

[0035] The DRU 11 contains pilot subcarriers with indices -214 and 38;

[0036] The DRU 12 contains pilot subcarriers with indices -93 and 159;

[0037] The DRU 13 contains pilot subcarriers with indices -192 and 60;

[0038] The DRU 14 contains pilot subcarriers with indices -126 and 126;

[0039] The DRU 15 contains pilot subcarriers with indices -203 and 49;

[0040] The DRU 16 contains pilot subcarriers with indices -104 and 148;

[0041] The DRU 17 contains pilot subcarriers with indices -181 and 71;

[0042] The DRU 18 contains pilot subcarriers with indices -82 and 170.

[0043] In a possible implementation, the first discrete bandwidth includes DRU 1 to DRU 16, and the DRU 1 to DRU 16 satisfy one or more of the following:

[0044] The DRU 1 contains pilot subcarriers with indices -195, -107, 305 and 393;

[0045] The DRU 2 contains pilot subcarriers with indices -151, -63, 349 and 437;

[0046] The DRU 3 contains pilot subcarriers with indices -371, -283, 129, and 217;

[0047] The DRU 4 contains pilot subcarriers with indices -327, -239, 173, and 261;

[0048] The DRU 5 contains pilot subcarriers with indices -261, -173, 239, and 327;

[0049] The DRU 6 contains pilot subcarriers with indices -217, -129, 283, and 371;

[0050] The DRU 7 contains pilot subcarriers with indices -393, -85, 107, and 415;

[0051] The DRU 8 contains pilot subcarriers with indices -437, -349, 63, and 151;

[0052] The DRU 9 contains pilot subcarriers with indices -338, -250, 162, and 250;

[0053] The DRU 10 contains pilot subcarriers with indices -294, -206, 206, and 294;

[0054] The DRU 11 contains pilot subcarriers with indices -426, -118, 74, and 382;

[0055] The DRU 12 contains pilot subcarriers with indices -382, -74, 118, and 426;

[0056] The DRU 13 contains pilot subcarriers with indices -404, -316, 96, and 184;

[0057] The DRU 14 contains pilot subcarriers with indices -360, -272, 140, and 228;

[0058] The DRU 15 contains pilot subcarriers with indices -228, -140, 272, and 360;

[0059] The DRU 16 contains pilot subcarriers with indices -184, -96, 316, and 404.

[0060] In a possible implementation, the difference between the indexes of the adjacent pilot subcarriers in the first discrete bandwidth is 11; the first discrete bandwidth is 20MHz or 40MHz, and each index less than 0 of the pilot subcarriers in the first discrete bandwidth is the opposite of each index greater than 0; or, the first discrete bandwidth is 80MHz, and the partial indexes less than 0 of the pilot subcarriers in the first discrete bandwidth are the opposites of the partial indexes greater than 0; thus, the storage and reading of the pilots can reuse the scheme of the storage and reading of the rRU, and the scheme of the storage and reading of the pilots does not need to be redesigned.

[0061] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU9, and the DRU1 to DRU9 satisfy one or more of the following:

[0062] The pilot subcarriers included in the DRU1 have indexes of -111 and 78;

[0063] The pilot subcarriers included in the DRU2 have indexes of -89 and 100;

[0064] The pilot subcarriers included in the DRU3 have indexes of -100 and 89;

[0065] The pilot subcarriers included in the DRU4 have indexes of -78 and 111;

[0066] The pilot subcarriers included in the DRU5 have indexes of -67 and 23;

[0067] The pilot subcarriers included in the DRU6 have indexes of -56 and 34;

[0068] The pilot subcarriers included in the DRU7 have indexes of -34 and 56;

[0069] The pilot subcarriers included in the DRU8 have indexes of -45 and 45;

[0070] The pilot subcarriers included in the DRU9 have indexes of -23 and 67.

[0071] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU18, and the DRU1 to DRU18 satisfy one or more of the following:

[0072] The pilot subcarriers included in the DRU1 have indexes of -224 and 136;

[0073] The pilot subcarriers included in the DRU2 have indexes of -125 and 37;

[0074] The pilot subcarriers included in the DRU3 have indexes of -202 and 158;

[0075] The pilot subcarriers included in the DRU4 have indexes of -103 and 59;

[0076] DRU5 includes pilot subcarriers with indices -81 and 81;

[0077] DRU6 includes pilot subcarriers with indices -114 and 48;

[0078] DRU7 includes pilot subcarriers with indices -213 and 147;

[0079] DRU8 includes pilot subcarriers with indices -92 and 70;

[0080] DRU9 includes pilot subcarriers with indices -191 and 169;

[0081] DRU10 includes pilot subcarriers with indices -169 and 191;

[0082] DRU11 includes pilot subcarriers with indices -70 and 92;

[0083] DRU12 includes pilot subcarriers with indices -147 and 213;

[0084] DRU13 includes pilot subcarriers with indices -48 and 114;

[0085] DRU14 includes pilot subcarriers with indices -180 and 180;

[0086] DRU15 includes pilot subcarriers with indices -59 and 103;

[0087] DRU16 includes pilot subcarriers with indices -158 and 202;

[0088] DRU17 includes pilot subcarriers with indices -37 and 125;

[0089] DRU18 includes pilot subcarriers with indices -136 and 224.

[0090] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU16, and the DRU1 to DRU16 satisfy one or more of the following:

[0091] DRU1 includes pilot subcarriers with indices -447, -359, 161, and 249;

[0092] DRU2 includes pilot subcarriers with indices -403, -315, 205, and 293;

[0093] DRU3 includes pilot subcarriers with indices -227, -139, 73, and 381;

[0094] The indexes of the pilot subcarriers included in the DRU4 are -183, -95, 117 and 425;

[0095] The indexes of the pilot subcarriers included in the DRU5 are -425, -117, 95 and 183;

[0096] The indexes of the pilot subcarriers included in the DRU6 are -381, -73, 139 and 227;

[0097] The indexes of the pilot subcarriers included in the DRU7 are -337, -249, 271 and 359;

[0098] The indexes of the pilot subcarriers included in the DRU8 are -293, -205, 315 and 403;

[0099] The indexes of the pilot subcarriers included in the DRU9 are -194, -106, 106 and 414;

[0100] The indexes of the pilot subcarriers included in the DRU10 are -150, -62, 62 and 150;

[0101] The indexes of the pilot subcarriers included in the DRU11 are -370, -282, 238 and 326;

[0102] The indexes of the pilot subcarriers included in the DRU12 are -326, -238, 282 and 370;

[0103] The indexes of the pilot subcarriers included in the DRU13 are -260, -172, 348 and 436;

[0104] The indexes of the pilot subcarriers included in the DRU14 are -216, -128, 84 and 392;

[0105] The indexes of the pilot subcarriers included in the DRU15 are -392, -84, 128 and 216;

[0106] The indexes of the pilot subcarriers included in the DRU16 are -436, -348, 172 and 260.

[0107] In a possible implementation, the difference between the indexes of at least one group of adjacent pilot subcarriers in the first discrete bandwidth is greater than 11; the first discrete bandwidth is 20MHz or 40MHz, and each index less than 0 of the pilot subcarriers in the first discrete bandwidth is the opposite of each index greater than 0; or, the first discrete bandwidth is 80MHz, and the indexes less than 0 of the pilot subcarriers in the first discrete bandwidth are the opposite of the indexes greater than 0; thus, the storage and reading of the pilot can reuse the scheme of the storage and reading of the rRU, and there is no need to redesign the scheme of the storage and reading of the pilot.

[0108] In a possible implementation, the first discrete bandwidth is 20MHz, the indexes of the pilot subcarriers in the first discrete bandwidth whose indexes are less than 0 are distributed in the range of -111 to -13; or, the first discrete bandwidth is 40MHz, the indexes of the pilot subcarriers in the first discrete bandwidth whose indexes are less than 0 are distributed in the range of -224 to -28; or, the first discrete bandwidth is 80MHz, the indexes of the pilot subcarriers in the first discrete bandwidth whose indexes are less than 0 are distributed in the range of -464 to -36.

[0109] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU9, and the DRU1 to DRU9 satisfy one or more of the following conditions:

[0110] The pilot subcarriers included in the DRU1 have indexes of -111 and 87;

[0111] The pilot subcarriers included in the DRU2 have indexes of -62 and 37;

[0112] The pilot subcarriers included in the DRU3 have indexes of -37 and 62;

[0113] The pilot subcarriers included in the DRU4 have indexes of -87 and 111;

[0114] The pilot subcarriers included in the DRU5 have indexes of -13 and 50;

[0115] The pilot subcarriers included in the DRU6 have indexes of -74 and 25;

[0116] The pilot subcarriers included in the DRU7 have indexes of -25 and 74;

[0117] The pilot subcarriers included in the DRU8 have indexes of -99 and 99;

[0118] The pilot subcarriers included in the DRU9 have indexes of -50 and 13.

[0119] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU18, and the DRU1 to DRU18 satisfy one or more of the following conditions:

[0120] The pilot subcarriers included in the DRU1 have indexes of -224 and 28;

[0121] The pilot subcarriers included in the DRU2 have indexes of -179 and 109;

[0122] The pilot subcarriers included in the DRU3 have indexes of -202 and 86;

[0123] The pilot subcarriers included in the DRU4 have indexes of -121 and 167;

[0124] DRU5 includes pilot subcarriers with indices -63 and 63;

[0125] DRU6 includes pilot subcarriers with indices -132 and 156;

[0126] DRU7 includes pilot subcarriers with indices -213 and 39;

[0127] DRU8 includes pilot subcarriers with indices -74 and 52;

[0128] DRU9 includes pilot subcarriers with indices -191 and 97;

[0129] DRU10 includes pilot subcarriers with indices -97 and 191;

[0130] DRU11 includes pilot subcarriers with indices -52 and 74;

[0131] DRU12 includes pilot subcarriers with indices -39 and 213;

[0132] DRU13 includes pilot subcarriers with indices -156 and 132;

[0133] DRU14 includes pilot subcarriers with indices -144 and 144;

[0134] DRU15 includes pilot subcarriers with indices -167 and 121;

[0135] DRU16 includes pilot subcarriers with indices -86 and 202;

[0136] DRU17 includes pilot subcarriers with indices -109 and 179;

[0137] DRU18 includes pilot subcarriers with indices -28 and 224.

[0138] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU16, and the DRU1 to DRU16 satisfy one or more of the following:

[0139] DRU1 includes pilot subcarriers with indices -195, -71, 269, and 393;

[0140] DRU2 includes pilot subcarriers with indices -331, -207, 133, and 257;

[0141] DRU3 includes pilot subcarriers with indices -355, -47, 109, and 453;

[0142] The DRU4 contains pilot subcarriers with indices -183, -59, 281, and 405;

[0143] The DRU5 contains pilot subcarriers with indices -405, -281, 59, and 183;

[0144] The DRU6 contains pilot subcarriers with indices -453, -109, 47, and 355;

[0145] The DRU7 contains pilot subcarriers with indices -393, -121, 71, and 343;

[0146] The DRU8 contains pilot subcarriers with indices -257, -133, 207, and 331;

[0147] The DRU9 contains pilot subcarriers with indices -430, -158, 306, and 430;

[0148] The DRU10 contains pilot subcarriers with indices -294, -170, 170, and 294;

[0149] The DRU11 contains pilot subcarriers with indices -442, -318, 146, and 418;

[0150] The DRU12 contains pilot subcarriers with indices -418, -146, 318, and 442;

[0151] The DRU13 contains pilot subcarriers with indices -368, -244, 96, and 220;

[0152] The DRU14 contains pilot subcarriers with indices -380, -36, 84, and 464;

[0153] The DRU15 contains pilot subcarriers with indices -464, -84, 36, and 380;

[0154] The DRU16 contains pilot subcarriers with indices -220, -96, 244, and 368.

[0155] In a possible implementation, the DRU1 contains subcarriers with index range [-120:9:-12] and [6:9:114];

[0156] The DRU2 contains subcarriers with index range [-116:9:-8] and [10:9:118];

[0157] The DRU3 contains subcarriers with index range [-118:9:-10] and [8:9:116];

[0158] DRU4 includes subcarriers with index ranging from [-114:9:-6] and [12:9:120];

[0159] DRU5 includes subcarriers with index ranging from [-112:9:-4] and [5:9:113];

[0160] DRU6 includes subcarriers with index ranging from [-119:9:-11] and [7:9:115];

[0161] DRU7 includes subcarriers with index ranging from [-115:9:-7] and [11:9:119];

[0162] DRU8 includes subcarriers with index ranging from [-117:9:-9] and [9:9:117];

[0163] DRU9 includes subcarriers with index ranging from [-113:9:-5] and [4:9:112].

[0164] In a possible implementation, DRU1 includes subcarriers with index ranging from [-242:18:-26] and [10:18:226];

[0165] DRU2 includes subcarriers with index ranging from [-233:18:-17] and [19:18:235];

[0166] DRU3 includes subcarriers with index ranging from [-238:18:-22] and [14:18:230];

[0167] DRU4 includes subcarriers with index ranging from [-229:18:-13] and [23:18:239];

[0168] DRU5 includes subcarriers with index ranging from [-225:18:-9] and [27:18:243];

[0169] DRU6 includes subcarriers with index ranging from [-240:18:-24] and [12:18:228];

[0170] DRU7 includes subcarriers with index ranging from [-231:18:-15] and [21:18:237];

[0171] DRU8 includes subcarriers with index ranging from [-236:18:-20] and [16:18:232];

[0172] DRU9 includes subcarriers with index ranging from [-227:18:-11] and [25:18:241];

[0173] The DRU 10 contains subcarriers with index ranging from [-241 : 18 : -25] and [11 : 18 : 227];

[0174] The DRU 11 contains subcarriers with index ranging from [-232 : 18 : -16] and [20 : 18 : 236];

[0175] The DRU 12 contains subcarriers with index ranging from [-237 : 18 : -21] and [15 : 18 : 231];

[0176] The DRU 13 contains subcarriers with index ranging from [-228 : 18 : -12] and [24 : 18 : 240];

[0177] The DRU 14 contains subcarriers with index ranging from [-234 : 18 : -18] and [18 : 18 : 234];

[0178] The DRU 15 contains subcarriers with index ranging from [-239 : 18 : -23] and [13 : 18 : 229];

[0179] The DRU 16 contains subcarriers with index ranging from [-230 : 18 : -14] and [22 : 18 : 238];

[0180] The DRU 17 contains subcarriers with index ranging from [-235 : 18 : -19] and [17 : 18 : 233];

[0181] The DRU 18 contains subcarriers with index ranging from [-226 : 18 : -10] and [26 : 18 : 242].

[0182] In a possible implementation, the DRU 1 contains subcarriers with index ranging from [-483 : 36 : -51, 17 : 36 : 449] and [-467 : 36 : -35, 33 : 36 : 465];

[0183] The DRU 2 contains subcarriers with index ranging from [-475 : 36 : -43, 25 : 36 : 457] and [-459 : 36 : -27, 41 : 36 : 473];

[0184] The DRU 3 contains subcarriers with index ranging from [-479 : 36 : -47, 21 : 36 : 453] and [-463 : 36 : -31, 37 : 36 : 469];

[0185] The DRU 4 contains subcarriers with index ranging from [-471 : 36 : -39, 29 : 36 : 461] and [-455 : 36 : -23, 45 : 36 : 477];

[0186] DRU5 includes subcarriers with index ranging from [-477:36:-45, 23:36:455] and [-461 :36:-29, 39:36:471];

[0187] DRU6 includes subcarriers with index ranging from [-469:36:-37, 31 :36:463] and [-453:36:-21, 47:36:479];

[0188] DRU7 includes subcarriers with index ranging from [-481 :36:-49, 19:36:451] and [-465:36:-33, 35:36:467];

[0189] DRU8 includes subcarriers with index ranging from [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475];

[0190] DRU9 includes subcarriers with index ranging from [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466];

[0191] DRU10 includes subcarriers with index ranging from [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474];

[0192] DRU11 includes subcarriers with index ranging from [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470];

[0193] DRU12 includes subcarriers with index ranging from [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478];

[0194] DRU13 includes subcarriers with index ranging from [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472];

[0195] DRU14 includes subcarriers with index ranging from [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480];

[0196] DRU15 includes subcarriers with index ranging from [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468];

[0197] The index range of the subcarriers included in the DRU 16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476].

[0198] In a second aspect, the embodiments of the present application provide another communication method, which comprises: transmitting or receiving an OFDM symbol according to a subcarrier planning corresponding to a first discrete bandwidth; pilot subcarriers in the subcarrier planning satisfy the following conditions: each DRU includes subcarriers with an index greater than 0 and subcarriers with an index less than 0, the first and last subcarriers in the subcarriers with an index greater than 0 are not pilot subcarriers, and the first and last subcarriers in the subcarriers with an index less than 0 are not pilot subcarriers; the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11; and the difference between the maximum and minimum values in the indexes of a plurality of pilot subcarriers in the first discrete bandwidth is greater than 11*n, where n is equal to the number of the plurality of pilot subcarriers minus 1. Thus, the range of pilot distribution can be improved, and pilot diversity is facilitated.

[0199] In a possible implementation, the first discrete bandwidth includes a plurality of first DRUs, each first DRU includes 26 subcarriers, and the absolute value of the difference between the indexes of two pilot subcarriers included in each first DRU is a first value, so that the index of the other pilot subcarrier included in each first DRU can be obtained by adding the first value to the index of the pilot subcarrier with an index less than 0 included in each first DRU. In this way, only the index of the pilot subcarrier with an index less than 0 needs to be stored, and the storage overhead can be reduced. Alternatively, the first discrete bandwidth includes a plurality of second DRUs, each second DRU includes 52 subcarriers, each second DRU includes two groups of pilot subcarriers with an absolute value of the difference between the indexes of 52, each group includes two pilot subcarriers, so that the index of the other pilot subcarrier in each group of pilot subcarriers included in each second DRU can be obtained by adding the second value to the index of the pilot subcarrier with an index less than 0 in each group of pilot subcarriers. In this way, only the index of the pilot subcarrier with an index less than 0 needs to be stored, and the storage overhead can be reduced.

[0200] In a possible implementation, the first discrete bandwidth is 20 MHz, and the first value is 126; alternatively, the first discrete bandwidth is 40 MHz, and the first value is 252; or alternatively, the first discrete bandwidth is 80 MHz, and the second value is 500.

[0201] In a possible implementation, a difference between absolute indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11; the first discrete bandwidth includes a plurality of first DRUs, each of which contains 26 subcarriers, each of which contains two pilot subcarriers, and a difference between relative indexes of the two pilot subcarriers in each of the first DRUs is 13 or 14; or, the first discrete bandwidth includes a plurality of second DRUs, each of which contains 52 subcarriers, each of which contains two pilot subcarriers with a difference between relative indexes of 13 or 14, and each of which contains two pilot subcarriers, thereby simplifying storage by storing an offset of the relative pilot index.

[0202] In a possible implementation, the first discrete bandwidth includes a plurality of first DRUs, each of which contains 26 subcarriers, each of which contains two pilot subcarriers, and indexes of the two pilot subcarriers in each of the first DRUs correspond to the same or a difference of 1 in an ordering value, an ordering value corresponding to an index of a first pilot subcarrier in each of the first DRUs is an ordering value of the index of the first pilot subcarrier in each of the subcarriers with an index greater than 0 contained in the first DRU, and an ordering value corresponding to an index of a second pilot subcarrier in each of the first DRUs is an ordering value of the index of the second pilot subcarrier in each of the subcarriers with an index less than 0 contained in the first DRU; thereby simplifying storage by performing storage of only half (positive half or negative half) of the relative pilot index.

[0203] In a possible implementation, the first discrete bandwidth is 20 MHz, a distribution range of pilot indexes less than 0 corresponding to the first discrete bandwidth is -111 to -15, and a distribution range of pilot indexes greater than 0 corresponding to the first discrete bandwidth is 15 to 111; or, the first discrete bandwidth is 40 MHz, a distribution range of pilot indexes less than 0 corresponding to the first discrete bandwidth is -224 to -27, and a distribution range of pilot indexes greater than 0 corresponding to the first discrete bandwidth is 28 to 225; or, the first discrete bandwidth is 80 MHz, a distribution range of pilot indexes less than 0 corresponding to the first discrete bandwidth is -467 to -36, and a distribution range of pilot indexes greater than 0 corresponding to the first discrete bandwidth is 33 to 464; thereby maximizing the pilot distribution range when the above conditions are met, which is beneficial to pilot diversity.

[0204] In a possible implementation, the first discrete bandwidth includes DRU1 to DRU9; the DRU1 to DRU9 satisfy one or more of the following conditions:

[0205] The DRU1 contains pilot subcarriers with indexes of -111 and 15;

[0206] The DRU2 contains pilot subcarriers with indexes of -26 and 100;

[0207] The DRU 3 contains pilot subcarriers with indices -100 and 26;

[0208] The DRU 4 contains pilot subcarriers with indices -15 and 111;

[0209] The DRU 5 contains pilot subcarriers with indices -76 and 50;

[0210] The DRU 6 contains pilot subcarriers with indices -38 and 88;

[0211] The DRU 7 contains pilot subcarriers with indices -88 and 38;

[0212] The DRU 8 contains pilot subcarriers with indices -63 and 63;

[0213] The DRU 9 contains pilot subcarriers with indices -50 and 76.

[0214] In a possible implementation, the first discrete bandwidth includes DRU 1 to DRU 18; the DRU 1 to DRU 18 satisfy one or more of the following

[0215] The DRU 1 contains pilot subcarriers with indices -224 and 28;

[0216] The DRU 2 contains pilot subcarriers with indices -143 and 109;

[0217] The DRU 3 contains pilot subcarriers with indices -166 and 86;

[0218] The DRU 4 contains pilot subcarriers with indices -85 and 167;

[0219] The DRU 5 contains pilot subcarriers with indices -27 and 225;

[0220] The DRU 6 contains pilot subcarriers with indices -96 and 156;

[0221] The DRU 7 contains pilot subcarriers with indices -213 and 39;

[0222] The DRU 8 contains pilot subcarriers with indices -38 and 214;

[0223] The DRU 9 contains pilot subcarriers with indices -155 and 97;

[0224] The DRU 10 contains pilot subcarriers with indices -61 and 191;

[0225] The DRU 11 contains pilot subcarriers with indices -178 and 74;

[0226] The DRU 12 contains pilot subcarriers with indices -201 and 51;

[0227] The DRU 13 contains pilot subcarriers with indices -120 and 132;

[0228] The DRU 14 contains pilot subcarriers with indices -108 and 144;

[0229] The DRU 15 contains pilot subcarriers with indices -131 and 121;

[0230] The DRU 16 contains pilot subcarriers with indices -50 and 202;

[0231] The DRU 17 contains pilot subcarriers with indices -73 and 179;

[0232] The DRU 18 contains pilot subcarriers with indices -190 and 62.

[0233] In a possible implementation, the first discrete bandwidth includes the DRU 1 to the DRU 16; the DRU 1 to the DRU 16 satisfy one or more of the following

[0234] The DRU 1 contains pilot subcarriers with indices -467, -159, 33 and 341;

[0235] The DRU 2 contains pilot subcarriers with indices -295, -171, 205 and 329;

[0236] The DRU 3 contains pilot subcarriers with indices -443, -319, 57 and 181;

[0237] The DRU 4 contains pilot subcarriers with indices -455, -147, 45 and 353;

[0238] The DRU 5 contains pilot subcarriers with indices -369, -245, 131 and 255;

[0239] The DRU 6 contains pilot subcarriers with indices -381, -73, 119 and 427;

[0240] The DRU 7 contains pilot subcarriers with indices -393, -85, 107 and 415;

[0241] The DRU 8 contains pilot subcarriers with indices -221, -97, 279 and 403;

[0242] The DRU 9 contains pilot subcarriers with indices -430, -122, 70 and 378;

[0243] The DRU 10 contains pilot subcarriers with indices -258, -134, 242 and 366;

[0244] The indexes of pilot subcarriers contained in DRU11 are -406, -282, 94 and 218;

[0245] The indexes of pilot subcarriers contained in DRU12 are -418, -110, 82 and 390;

[0246] The indexes of pilot subcarriers contained in DRU13 are -332, -208, 168 and 292;

[0247] The indexes of pilot subcarriers contained in DRU14 are -344, -36, 156 and 464;

[0248] The indexes of pilot subcarriers contained in DRU15 are -356, -48, 144 and 452;

[0249] The indexes of pilot subcarriers contained in DRU16 are -184, -60, 316 and 440.

[0250] In a possible implementation, the indexes of subcarriers contained in DRU1 range from [-120:9:-12] and [6:9:114];

[0251] The indexes of subcarriers contained in DRU2 range from [-116:9:-8] and [10:9:118];

[0252] The indexes of subcarriers contained in DRU3 range from [-118:9:-10] and [8:9:116];

[0253] The indexes of subcarriers contained in DRU4 range from [-114:9:-6] and [12:9:120];

[0254] The indexes of subcarriers contained in DRU5 range from [-112:9:-4] and [5:9:113];

[0255] The indexes of subcarriers contained in DRU6 range from [-119:9:-11] and [7:9:115];

[0256] The indexes of subcarriers contained in DRU7 range from [-115:9:-7] and [11:9:119];

[0257] The indexes of subcarriers contained in DRU8 range from [-117:9:-9] and [9:9:117];

[0258] The indexes of subcarriers contained in DRU9 range from [-113:9:-5] and [4:9:112].

[0259] In a possible implementation, the DRU1 contains subcarriers with index ranging from [-242:18:-26] and [10:18:226];

[0260] The DRU2 contains subcarriers with index ranging from [-233:18:-17] and [19:18:235];

[0261] The DRU3 contains subcarriers with index ranging from [-238:18:-22] and [14:18:230];

[0262] The DRU4 contains subcarriers with index ranging from [-229:18:-13] and [23:18:239];

[0263] The DRU5 contains subcarriers with index ranging from [-225:18:-9] and [27:18:243];

[0264] The DRU6 contains subcarriers with index ranging from [-240:18:-24] and [12:18:228];

[0265] The DRU7 contains subcarriers with index ranging from [-231:18:-15] and [21:18:237];

[0266] The DRU8 contains subcarriers with index ranging from [-236:18:-20] and [16:18:232];

[0267] The DRU9 contains subcarriers with index ranging from [-227:18:-11] and [25:18:241];

[0268] The DRU10 contains subcarriers with index ranging from [-241:18:-25] and [11:18:227];

[0269] The DRU11 contains subcarriers with index ranging from [-232:18:-16] and [20:18:236];

[0270] The DRU12 contains subcarriers with index ranging from [-237:18:-21] and [15:18:231];

[0271] The DRU13 contains subcarriers with index ranging from [-228:18:-12] and [24:18:240];

[0272] The DRU14 contains subcarriers with index ranging from [-234:18:-18] and [18:18:234];

[0273] The index range of the subcarriers included in the DRU 15 is [-239:18:-23] and [13:18:229];

[0274] The index range of the subcarriers included in the DRU 16 is [-230:18:-14] and [22:18:238];

[0275] The index range of the subcarriers included in the DRU 17 is [-235:18:-19] and [17:18:233];

[0276] The index range of the subcarriers included in the DRU 18 is [-226:18:-10] and [26:18:242].

[0277] In a possible implementation, the index range of the subcarriers included in the DRU 1 is [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465];

[0278] The index range of the subcarriers included in the DRU 2 is [-475:36:-43, 25:36:457] and [-459:36:-27, 41:36:473];

[0279] The index range of the subcarriers included in the DRU 3 is [-479:36:-47, 21:36:453] and [-463:36:-31, 37:36:469];

[0280] The index range of the subcarriers included in the DRU 4 is [-471:36:-39, 29:36:461] and [-455:36:-23, 45:36:477];

[0281] The index range of the subcarriers included in the DRU 5 is [-477:36:-45, 23:36:455] and [-461:36:-29, 39:36:471];

[0282] The index range of the subcarriers included in the DRU 6 is [-469:36:-37, 31:36:463] and [-453:36:-21, 47:36:479];

[0283] The index range of the subcarriers included in the DRU 7 is [-481:36:-49, 19:36:451] and [-465:36:-33, 35:36:467];

[0284] The index range of the subcarriers included in the DRU 8 is [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475];

[0285] The index range of subcarriers included in the DRU9 is [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466];

[0286] The index range of subcarriers included in the DRU10 is [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474];

[0287] The index range of subcarriers included in the DRU11 is [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470];

[0288] The index range of subcarriers included in the DRU12 is [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478];

[0289] The index range of subcarriers included in the DRU13 is [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472];

[0290] The index range of subcarriers included in the DRU14 is [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480];

[0291] The index range of subcarriers included in the DRU15 is [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468];

[0292] The index range of subcarriers included in the DRU16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476].

[0293] In a third aspect, an embodiment of the present application provides a communication apparatus, which is configured to execute the method in any of the first aspect to the second aspect or any possible implementation manner. The communication apparatus includes a module configured to execute the method in any of the first aspect to the second aspect or any possible implementation manner, for example, a processing module and a transceiver module.

[0294] In a fourth aspect, an embodiment of the present application provides a communication apparatus, comprising a processor configured to implement a method recited in any of the first aspect to the second aspect or any possible implementation of the first aspect to the second aspect. The processor is configured to execute a program stored in the memory to implement the method recited in any of the first aspect to the second aspect or any possible implementation of the first aspect to the second aspect.

[0295] In a possible implementation, the memory is located outside the communication apparatus.

[0296] In a possible implementation, the memory is located inside the communication apparatus.

[0297] In an embodiment of the present application, the processor and the memory can also be integrated into one device, i.e., the processor and the memory can also be integrated together. For example, the communication apparatus can be a chip.

[0298] In a possible implementation, the communication apparatus further comprises a transceiver configured to receive or send information.

[0299] In a fifth aspect, an embodiment of the present application provides a communication apparatus, comprising a logic circuit and an interface, wherein the logic circuit and the interface are coupled; the interface is configured to input and / or output information, and the logic circuit is configured to implement a method recited in any of the first aspect to the second aspect or any possible implementation of the first aspect to the second aspect.

[0300] In a sixth aspect, an embodiment of the present application provides a computer readable storage medium, configured to store a computer program, which when executed on a computer, causes a method recited in any of the first aspect to the second aspect or any possible implementation of the first aspect to the second aspect to be implemented.

[0301] In a seventh aspect, an embodiment of the present application provides a computer program product, which when executed on a computer, causes a method recited in any of the first aspect to the second aspect or any possible implementation of the first aspect to the second aspect to be implemented. BRIEF DESCRIPTION OF DRAWINGS

[0302] FIG. 1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present application;

[0303] FIG. 2a is a schematic diagram of subcarrier distribution and RU distribution of 20MHz according to an embodiment of the present application;

[0304] FIG. 2b is a schematic diagram of subcarrier distribution and RU distribution of 40MHz according to an embodiment of the present application;

[0305] FIG. 2c is a schematic diagram of subcarrier distribution and RU distribution of 80MHz according to an embodiment of the present application;

[0306] FIG. 3a is a flow diagram of uplink multi-user transmission according to an embodiment of the present application;

[0307] FIG. 3b is a frame format diagram of EHT variant user info field according to an embodiment of the present application;

[0308] FIG. 4 is a flow diagram of a communication method according to an embodiment of the present application;

[0309] FIG. 5 is a flow diagram of another communication method according to an embodiment of the present application;

[0310] FIG. 6 is a schematic diagram of a structure of a communication apparatus according to an embodiment of the present application;

[0311] FIG. 7 is a schematic diagram of another structure of a communication apparatus according to an embodiment of the present application;

[0312] FIG. 8 is a schematic diagram of yet another structure of a communication apparatus according to an embodiment of the present application. DETAILED DESCRIPTION

[0313] The terms “first” and “second” and the like in the specification, claims and drawings of the present application merely mean to distinguish different objects, and are not intended to describe particular order. It can be understood that various numbers involved in the embodiments of the present application are only for distinguishing convenience, and do not limit the scope of the embodiments of the present application. The size of the serial numbers of the processes involved in the embodiments of the present application does not mean the order of execution, and the execution order of the processes should be determined according to their functions and inherent logic. 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, etc., or can optionally include other steps or units inherent to the process, method, product or device, etc.

[0314] “Embodiment” mentioned herein 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 phrase appears in various places in the specification does not necessarily mean the same embodiment, nor is it a separate or alternative embodiment independent of or alternative to other embodiments. It can be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments. In the present application, the naming of messages is only for distinguishing different messages, and should not be understood as limitation. That is, the name of any message in the present application can be replaced by other naming, and the present application is not limited.

[0315] The terminology used in the following embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used in the description of the embodiments of the application and the appended claims, the singular forms "a," "an" and "the" are intended to include both singular and plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "and / or," as used in the description of the embodiments of the application, refers to and encompasses any and all possible combinations of one or more of the associated listed items. For example, the phrase "A and / or B" can refer to, for example, A only, B only, both of A and B, or any combination thereof. As used in the description of the embodiments of the present application, the term "multiple" means two or more. In the description of the embodiments of the present application, the character " / " generally represents an "or" relationship between the objects before and after the character " / ".

[0316] In the embodiments of the present application, "A corresponds to B" means that A and B have a corresponding relationship, and B can be determined according to A. However, it should also be understood that the determination (or generation) of B according to (or based on) A does not mean that B is determined (or generated) only according to (or based on) A, but B can also be determined (or generated) according to (or based on) A and / or other information.

[0317] In the present application, indication includes direct indication (also known as explicit indication) and implicit indication. Among them, direct indication of information A means including information A; implicit indication of information A means indicating information A through the corresponding relationship between information A and information B and directly indicating information B. Among them, the corresponding relationship between information A and information B can be pre-defined, pre-stored, pre-burned or pre-configured.

[0318] In the present application, "sending" and "receiving" represent the direction of signal transmission. For example, "sending information to XX" can be understood as that the destination of the information is XX, which can include direct sending through the air interface, and also includes indirect sending through the air interface by other units or modules. "Receiving information from YY" can be understood as that the source of the information is YY, which can include direct receiving from YY through the air interface, and also includes indirect receiving from YY through the air interface from other units or modules. "Sending" can also be understood as "output" of chip interface, and "receiving" can also be understood as "input" of chip interface. In other words, sending and receiving can be carried out between devices, such as between network devices and terminal devices, or can be carried out within a device, such as between components, modules, chips, software modules or hardware modules within a device through bus, wire or interface.

[0319] The embodiments of the present application provide a condition that should be met by pilot subcarriers in a DRU subcarrier plan, so that the communication performance and / or storage cost can be improved when a communication device transmits or receives OFDM symbols according to the DRU subcarrier plan. In other words, the embodiments of the present application provide a design (i.e., which subcarriers are used as pilot subcarriers) of pilot subcarriers in a DRU subcarrier plan.

[0320] The following introduces a system related to the embodiments of the present application.

[0321] The technical solutions provided in the embodiments of the present application can be applied to a wireless local area network (WLAN) system, such as Wi-Fi and the like. The technical solutions provided in the embodiments of the present application can be applicable to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series of protocols (or standards), for example, the 802.11be protocol, the 802.11bn protocol (or Wi-Fi 8, also referred to as ultra high reliability (UHR) or ultra high reliability and throughput (UHRT), and the like), or a next-generation protocol of the 802.11bn protocol or a protocol supporting ambient power (AMP), and the like, which are not listed one by one. The technical solutions provided in the embodiments of the present application can also be applied to a wireless personal area network (WPAN) based on millimeter wave (MMW) and ultra wideband (UWB) technology, and the like. The technical solutions provided in the embodiments of the present application can be applicable to the IEEE 802.15 series of protocols, for example, the 802.15.4a protocol, the 802.15.4z protocol or the 802.15.4ab protocol, or a future generation UWB WPAN protocol, and the like, which are not listed one by one. The technical solutions provided in the embodiments of the present application can also be applied to a spark link or nearlink standard protocol. The technical solutions provided in the embodiments of the present application can also be applied to a communication system, for example, can be an internet of things (IoT) system, a vehicle-to-everything (V2X) system (X can represent any thing), a device-to-device (D2D) system, a narrow band IoT (NB-IoT) system, a long term evolution (LTE) system, a 5th-generation (5G) communication system, and a new communication system to be generated in future communication development, and the like. For example, the V2X can include vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P) or vehicle-to-network (V2N) communication, and the like.

[0322] The WLAN system can provide high-rate and low-latency transmission. As the WLAN application scenarios evolve, the WLAN system will be applied to more scenarios or industries, such as the Internet of Things industry, the Internet of Vehicles industry, the banking industry, enterprise offices, stadiums, exhibition halls, concert halls, hotel rooms, dormitories, wards, classrooms, supermarkets, squares, streets, production workshops, and warehouses. Of course, the devices (such as access points or stations) that support WLAN communication or sensing can be sensor nodes in smart cities (such as smart water meters, smart electricity meters, and smart air detection nodes), smart devices in smart homes (such as smart cameras, projectors, display screens, televisions, sound systems, refrigerators, washing machines, and the like), nodes in the Internet of Things, entertainment terminals (such as augmented reality (AR) and virtual reality (VR) wearable devices), smart devices in smart offices (such as printers, projectors, amplifiers, sound systems, and the like), 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, and the like), and devices in large sports and music venues.

[0323] Although the embodiments of the present application mainly take WLAN as an example, especially the network applying to the IEEE 802.11 series standards. The various aspects involved in the embodiments of the present application can be extended to other networks using various standards or protocols. For example, Bluetooth, high performance radio LAN (HIPERLAN) (a wireless standard similar to the IEEE 802.11 standard), and wide area network (WAN) or other now known or later developed networks.

[0324] In a possible implementation, the method provided by the embodiments of the present application can be implemented by a communication device in a communication system. For example, the communication device can be an access point (AP) or a station (STA).

[0325] The AP is a device with wireless communication function, which supports communication or sensing or energy transmission by using WLAN protocol, has the function of communication or sensing with other devices (such as non-AP STA or other access points) in the WLAN network or energy transmission, and of course, can also have the function of communication or sensing or energy transmission with other devices. Alternatively, the access point is equivalent to a bridge connecting wired and wireless networks, 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 referred to as an access point station (AP STA). The device with wireless communication function can be a whole device, or a chip, processing system or functional module installed in the whole device, and the device installed with the chip or processing system or functional module can realize the method and function of the embodiments of the present application under the control of the chip or processing system or functional module. The AP in the embodiments of the present application is a device providing services for non-AP 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) networks, mainly deployed in homes, buildings and parks, with a typical coverage radius of tens of meters to hundreds of meters, and of course, can also be deployed outdoors. For another example, the AP can be a communication server, a router, a switch, a network bridge and the like. The AP can include various forms of macro base stations, micro base stations, relay stations and the like. Of course, the AP can also be a chip or processing system or module in the above various forms of devices, so as to realize the method and function of the embodiments of the present application.

[0326] The STA is a device with wireless communication function, which supports communication or sensing or energy transmission using WLAN protocol, and has the ability to communicate or sense or energy transmission with other non-AP STAs 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 or energy transmission with an AP and then communicate with a WLAN. The device with wireless communication function can be a complete device, or a chip or processing system or functional module installed in the complete device. The device installed with the chip or processing system or functional module can realize the method and function of the embodiments of the present application under the control of the chip or processing system or functional module. For example, the STA 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 STA 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 television 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. Of course, the STA can also be a chip or processing system or module in the above various forms of devices, thereby realizing the method and function of the embodiments of the present application.

[0327] For example, the communication system to which the method provided by the embodiments of the present application can be applied can include an access point and a station. For example, the embodiments of the present application can be applied to the scenario of communication or sensing between an AP and a STA, between an AP and an AP, or between a STA and a STA in a WLAN, which is not limited by the embodiments of the present application. Optionally, the AP can communicate or sense with a single STA, or the AP can simultaneously communicate or sense with multiple STAs. Specifically, the communication or sensing between the AP and the multiple STAs can 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 communication or sensing between the AP and the STA, between the AP and the AP, and between the STA and the STA can support a WLAN communication protocol, which can include IEEE 802.11 series of protocols, such as 802.11bn protocol, and of course also applies to protocols after 802.11bn.

[0328] FIG. 1 is a schematic diagram of an architecture of a communication system according to an embodiment of the present application. The communication system can include one or more APs and one or more STAs. Two access points, e.g., AP1 and AP2, and three stations, e.g., STA1, STA2 and STA3, are shown in FIG. 1. As an example, the method provided by the embodiments of the present application can be applied to data communication or sensing or energy transfer between an AP and one or more STAs, e.g., the communication or sensing or energy transfer between AP1 and STA1 shown in FIG. 1, or the communication or sensing or energy transfer between AP1 and STA1 and STA2 shown in FIG. 1. As another example, the method provided by the embodiments of the present application can be applied to communication between APs, e.g., the communication or sensing or energy transfer between AP1 and AP2 shown in FIG. 1. As yet another example, the method provided by the embodiments of the present application can be applied to communication or sensing or energy transfer between STAs, e.g., the communication or sensing or energy transfer between STA2 and STA3 shown in FIG. 1.

[0329] The STA is a mobile phone and the AP is a router in FIG. 1 as an example, which does not limit the types of AP and STA in the embodiments of the present application. Meanwhile, the number of APs and STAs shown in FIG. 1 is only an example, and the number of APs or STAs can be more or less in specific implementation, which is not limited in the embodiments of the present application.

[0330] From different perspectives of transmitting and receiving OFDM symbols, the first communication device shown below can be understood as a communication device for transmitting OFDM symbols, and the second communication device can be understood as a communication device for receiving OFDM symbols. Alternatively, the first communication device can also be referred to as a transmitting end, and the second communication device can also be referred to as a receiving end.

[0331] From the perspective of different devices, as an example, the first communication device and the second communication device can be Wi-Fi chips or functional modules or processing systems, etc. arranged in different Wi-Fi devices. As another example, the first communication device can be an AP, and the second communication device can be a non-AP STA. As yet another example, the first communication device and the second communication device can both be non-AP STAs or both be APs. As yet another example, the first communication device can be a non-AP STA, and the second communication device can be an AP. As yet another example, at least one of the first communication device and the second communication device can be a multi-link device (MLD), etc. The embodiments of the present application are not listed one by one. For example, the MLD refers to a device that has multiple stations (such as APs or non-AP STAs) working on different frequency bands or channels at the same time. The multi-link device includes multiple affiliated stations, which can be physical stations or logical stations, and each station can work on a link or a frequency band or a channel, etc. The above-mentioned affiliated stations can be APs or non-AP STAs. The multi-link device (such as a non-AP MLD or an AP MLD) can be a communication device with wireless communication function. The communication device can be a whole machine device, or a chip or processing system or module installed in the whole machine device, etc. The device installed with the chip or processing system or module can realize the method and function of the embodiments of the present application under the control of the chip or processing system or module. The multi-link device can comply with the 802.11 series protocol to realize wireless communication, so as to realize communication with other devices. The other devices shown here can be multi-link devices or not. The frequency band in which the multi-link device works can include but is not limited to sub 1GHz, 2.4GHz, 5GHz, 6GHz, etc. which are not listed one by one here.

[0332] The embodiments of the present application describe the method provided by the embodiments of the present application from the perspective of the first communication device and the second communication device, but the first communication device and the second communication device can also forward the signal in the process of transmitting the signal through other devices, such as through a forwarding device to forward the signal between the first communication device and the second communication device. The embodiments of the present application do not limit other devices other than the first communication device and the second communication device.

[0333] The following introduces the terms or names related to the embodiments of the present application.

[0334] 1. Resource unit (RU) based subcarrier planning (tone plan)

[0335] As an example, when the bandwidth is 20MHz, the whole bandwidth (i.e., 20MHz) can be composed of one whole 242-tone RU, or various combinations of 26-tone RU, 52-tone RU, 106-tone RU. FIG. 2a is a schematic diagram of subcarrier distribution and RU distribution of 20MHz according to an embodiment of the present application. As shown in FIG. 2a, 20MHz can include 9 26-tone RUs, or include 4 52-tone RUs, or include 2 106-tone RUs, or include 1 242-tone. The subcarrier planning can also be referred to as subcarrier distribution.

[0336] A 26-tone RU is an RU including 26 subcarriers, a 52-tone RU is an RU including 52 subcarriers, a 106-tone RU is an RU including 106 subcarriers, and a 242-tone RU is an RU including 242 subcarriers, and so on. Each RU can include data subcarriers and pilot subcarriers. For example, the data subcarriers can be used to carry data information, and the pilot subcarriers can be used for phase offset and / or frequency offset estimation, etc. In addition to the RUs, the above-mentioned 20MHz bandwidth can also include at least one of the following: one or more guard subcarriers, one or more null subcarriers, one or more direct current (DC) subcarriers. The subcarrier range included in each RU can refer to relevant standards or protocols, and will not be described one by one here. The description of the RU or subcarrier here is also applicable to other bandwidths shown below, and will not be described again below. The description of the subcarrier here is also applicable to the description of the DRU below, and will not be described again below.

[0337] As another example, when the bandwidth is 40MHz, the whole bandwidth (i.e., 40MHz) can be composed of one whole 484-tone RU, or various combinations of 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU. The whole bandwidth is roughly equivalent to a copy of the subcarrier planning of 20MHz. As shown in FIG. 2b, 40MHz can include 18 26-tone RUs, or include 8 52-tone RUs, or include 4 106-tone RUs, or include 2 242-tone RUs, or include 1 484-tone RU.

[0338] As another example, when the bandwidth is 80MHz, the entire bandwidth (i.e., 80MHz) can be composed of one entire 996-tone RU, or various combinations of 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU. As shown in FIG. 2c, 80MHz can include 36 26-tone RUs, or include 16 52-tone RUs, or include 8 106-tone RUs, or include 4 242-tone RUs, or include 2 484-tone RUs, or include 1 996-tone RU. Where 484L, 484R represent the left half and the right half of a 484-tone RU, respectively, containing 242 subcarriers, which is another representation of 484+5DC. For example, with the subcarrier range of a 484-tone RU being [-500:-12], “484L” is the low frequency part relative to the frequency center of the 484-tone RU, i.e., [-500:-259], and “484R” is the high frequency part relative to the frequency center of the 484-tone RU, i.e., [-253:-12]. Similarly, for example, with the subcarrier range of a 484-tone RU being [12:500], “484L” is [12:253], and “484R” is [259:500]. Here, we do not list them one by one.

[0339] In this application, [a:b] can refer to all integers from a to b (a and b are also integers), i.e., a, (a+1), (a+2), (a+3), …, b; we do not list them one by one below. For example, [259:500] represents 259, 260, 261, 262, …, 498, 499, 500. As another example, [-500:-259] represents -500, -499, -498, -497, …, -260, -259.

[0340] As another example, when the bandwidth is 160MHz, the entire bandwidth can be seen as a copy of two 80MHz subcarrier distributions, i.e., the entire bandwidth can be composed of one entire 2*996-tone RU, or various combinations of 26-tone RU, 52-tone RU, 106-tone RU, 242-tone RU, 484-tone RU, 996-tone RU. When the bandwidth is 320MHz, the entire bandwidth can be seen as a copy of four 80MHz subcarrier distributions. Here, we do not list them one by one.

[0341] In the above various subcarrier plans, in units of 242-tone RUs (i.e., 20MHz), the leftmost of FIGS. 2a-2c can be the lowest frequency, and the rightmost of FIGS. 2a-2c can be the highest frequency. From left to right, the 242-tone RUs can be labeled: first (1st), second (2 nd ), …, sixteenth (16 th ). Taking a 320MHz bandwidth as an example, the data field in a wireless frame can occupy up to 16 242-tone RUs, that is, in the data field, up to 16 242-tone RUs can be one-to-one corresponding to 16 20MHz channels in frequency from low to high.

[0342] Generally, one STA can be allocated multiple RUs, that is, multiple RUs can be allocated to one STA in combination, and therefore the 802.11be standard supports multiple resource units (MRU). In other words, in addition to the several RUs mentioned above, the 802.11be standard also includes some MRUs. For example, one 52-tone RU and one 26-tone RU form a 52+26-tone MRU. For another example, one 106-tone RU and one 26-tone RU form a 106+26-tone MRU. For another example, one 996-tone RU and one 484-tone RU form a 996+484-tone MRU. For another example, two 996-tone RUs and one 484-tone RU form a 2*996+484-tone MRU. For another example, three 996-tone RUs form a 3*996-tone MRU. For another example, three 996-tone RUs and one 484-tone RU form a 3*996+484-tone MRU. The symbol “*” in this application represents “multiply” or “times”.

[0343] At the bandwidth level, when the subcarrier spacing is 78.125KHz, the 26-tone RU can correspond to about 2MHz (i.e., 26*78.125KHz=2031.25KHz≈2MHz), the 52-tone RU can correspond to about 4MHz, the 106-tone RU can correspond to about 8MHz, and the 242-tone RU can correspond to about 20MHz. The sizes of other RUs can be similarly added or multiplied, and this application will not be repeated.

[0344] The above RU can be referred to as a regular RU (rRU). The regular RU has a smaller bandwidth and a lower transmission power than the DRU. The "lower" here is relative to the distributed RU, which can have a further increased transmission power relative to the regular RU.

[0345] 2. Uplink multi-user transmission

[0346] The uplink multi-user transmission is an important technology. Referring to FIG. 3a, which is a flow diagram of uplink multi-user transmission provided by an embodiment of the present application. As shown in FIG. 3a, the flow of uplink multi-user transmission can include: an AP sends a trigger frame for triggering uplink multi-user transmission, the trigger frame carrying identifier information and resource allocation information of one or more stations; each station, after receiving the trigger frame, sends an uplink frame (such as an uplink data frame or a control frame) on the allocated resource unit (RU) using a trigger based physical layer protocol data unit (TB PPDU), and receives a block acknowledge (BA) frame sent by the AP after a short inter-frame space (SIFS). Each station can determine the resource unit allocated to itself based on the resource allocation information.

[0347] In a possible implementation, the trigger frame can include but is not limited to a common information field and a user info list field. The common information field can contain common information that all STAs scheduled by the trigger frame need to read. In 802.11be, the user info list field of the trigger frame can include but is not limited to one or more EHT variant user info fields. One EHT variant user info field can contain information that an EHT STA needs to read. Referring to FIG. 3b, which is a frame format diagram of an EHT variant user info field provided by an embodiment of the present application. As shown in FIG. 3b, the EHT variant user info field includes but is not limited to a resource unit allocation subfield (RU Allocation subfield) and a primary-secondary 160 subfield (PS160 subfield).

[0348] Generally, the RU or MRU allocated to a STA can be indicated by the following subfields: Resource Unit Allocation subfield, Primary / Secondary 160 subfield, Uplink Bandwidth subfield in the Common Info field, and Uplink Bandwidth extension subfield in the Special User Info field. In the Common Info field, B55 indicates whether there is a Special User Info field in the User Info field. For EHT TB PPDU, the bandwidth is jointly determined by the UL BW subfield and the UL BW extension subfield in the Special User Info field.

[0349] The B0 bit in the RU Allocation subfield, the B7-B1 bits in the RU Allocation subfield, the PS160 subfield, and the mapping between RU and MRU are shown in Table 1 below. The bandwidth is jointly determined by the UL BW subfield and the UL BW extension subfield in the Special User Info field. Table 1 shows the interpretation of the RU Allocation subfield and the PS160 subfield in the Trigger frame of 802.11be.

[0350] Table 1

[0351] In one possible implementation, N in Table 1 above can be obtained by the formula N = 2*X1+X0. The values of X1 and X0 can be seen from Table 2 below, which shows the Lookup table for X1 and N.

[0352] Table 2

[0353] P80 in Table 2 above represents the primary 80MHz channel, S80 represents the secondary 80MHz channel, and S160 represents the secondary 160MHz channel.

[0354] In the above table 2, the configuration refers to the order of P80, S80 and S160 in absolute frequency, from left to right, indicating from low frequency to high frequency. For example, [P80 S80] indicates that the primary 80MHz channel is the first 80MHz channel from low to high frequency, and the secondary 80MHz channel is the second 80MHz channel from low to high frequency; or in other words, [P80 S80] indicates that the primary 80MHz channel is the low 80MHz channel, and the secondary 80MHz channel is the high 80MHz channel. For another example, [S80 P80 S160] indicates that the secondary 80MHz channel is the low 80MHz channel in the low 160MHz channel, the primary 80MHz channel is the high 80MHz channel in the low 160MHz channel, and the secondary 160MHz channel is the high 160MHz channel.

[0355] 3. Distributed resource unit

[0356] Recently, the United States Federal Communications Commission has promulgated regulations on the 6GHz spectrum, defining a low power indoor (LPI) communication mode, which strictly limits the maximum power and maximum frequency spectrum density of transmission. For example, for a station (STA), the maximum power is 24dBm, and the maximum power spectrum density is -1dBm / MHz. The transmission power of the device is limited by both the maximum power and the maximum power spectrum density. First, the transmission power cannot exceed the maximum power value, and the power spectrum density of the transmission cannot exceed the maximum power spectrum density. Compared with the maximum power, the maximum power spectrum density is more restrictive, and the maximum power allowed for transmission is usually more limited by the power spectrum density. For a station, when the bandwidth is the maximum 320MHz, it reaches the limit of the maximum power specified by the regulations. Below this bandwidth, it can only transmit lower power due to the maximum power spectrum density limit. On June 30, 2021, Europe also issued regulations on the 6GHz spectrum, targeting LPI communication modes, such as a maximum power of 23dBm and a maximum power spectrum density of 10dBm / MHz. When the bandwidth does not exceed 20MHz, the transmission power of the AP / STA is mainly limited by the power spectrum density, and when the bandwidth is greater than 20MHz, the transmission power of the AP / STA is mainly limited by the maximum power.

[0357] Due to the power spectral density limitation, the limited number of subcarriers (e.g., 26-tone RU) can be distributed to a wider bandwidth, i.e., more subcarriers (e.g., odd subcarriers of 2 26-tone RUs), to obtain an increase in transmission power, i.e., a distributed RU, or a distributed RU. The distributed bandwidth refers to the discrete range of subcarriers included in the DRU, which is generally a part of the bandwidth (channel bandwidth). It is commonly used in uplink multi-user transmission, and by interleaving the transmission of distributed RUs by multiple users, the transmission power of each user can be increased under the condition of a certain bandwidth. It should be noted that the maximum power spectral density is limited in the form of 1 MHz transmission power not exceeding x mw, considering the 78.125 kHz carrier spacing, 1 MHz contains 12.8 (about 13) subcarriers. Since the average power of each subcarrier is the same during transmission, observing any 13 consecutive subcarriers, the maximum number of subcarriers carrying signals will determine the average power of each subcarrier, and in turn determine the transmission power of the signal. For example, under a 20M bandwidth (total of 242 subcarriers), among all 13 consecutive subcarriers, the maximum number of subcarriers carrying signals is 5, so the average power of each subcarrier will be x (mw) / 5. Considering that there are a total of 26 subcarriers carrying signals, the total transmission power will be x (mw) / 5*26.

[0358] The DRU in the present application includes a plurality of subcarriers distributed in the frequency domain, or a plurality of subcarriers with discrete indexes, or a plurality of subcarriers with non-continuous indexes. The plurality of subcarriers can be partially distributed or completely distributed. For example, the plurality of subcarriers can include a part of subcarriers that are continuous in frequency and a part of subcarriers that are not continuous in frequency. For another example, the plurality of subcarriers can be completely not continuous in frequency. The above-mentioned "continuous in frequency" can also be referred to as the indexes of the subcarriers being continuous, and "not continuous in frequency" can also be referred to as the indexes of the subcarriers being not continuous. The "distributed RU" and "DRU" or "distributed RU" in the present application can be used interchangeably. It should also be understood that the DRU referred to in the present application refers to the RU with subcarriers distributed in the frequency domain, that is, the RU with this characteristic is referred to as distributed RU or distributed RU in the present application, but the RU with this characteristic can also have other names in practice, which is not limited in the present application.

[0359] The contiguous RU in this application refers to an RU composed of contiguous subcarriers, or an RU composed of two groups of contiguous subcarrier groups, each group of contiguous subcarrier groups including contiguous subcarriers, and the two groups of contiguous subcarrier groups being separated by only guard subcarriers, null subcarriers, or direct current subcarriers. Of course, the contiguous RU can also be referred to as other names, for example, regular RU (rRU). The terms "contiguous RU" and "regular RU" can be used interchangeably, and the application does not limit the name of the contiguous RU.

[0360] 4. DRU tone plan

[0361] In one possible implementation, the DRU tone plan is designed based on the following three principles: first, the size and number of DRUs are the same as rRUs; second, the hierarchical relationship between DRUs of different sizes is the same as rRUs; and third, the existing RU indication table can be reused. The current standard proposal provides DRU tone plans for 20M, 40M, and 80M, as shown in Tables 3-5.

[0362] Table 3. 20M tone plan

[0363] Table 3 shows data and pilot subcarrier indices for distributed tone RUs (DRUs) in 20MHz UHR PPDU. Table 3 shows indices of subcarriers (including data subcarriers and pilot subcarriers) included in 9 26-tone DRUs (i.e., 26-tone DRU1 ~ 26-tone DRU9), where [-120:9:-12, 6:9:114] means indices of subcarriers (including data subcarriers and pilot subcarriers) included in DRU1, [-116:9:-8, 10:9:118] means indices of subcarriers included in DRU2,..., [-113:9:-5, 4:9:112] means indices of subcarriers included in DRU9. In this application, [a:b:c] can mean all integers from a to c with interval b (a, b and c are integers), i.e., a, (a+b), (a+2b), (a+3b),..., c; details are not repeated hereinafter. For example, [-120:9:-12] is -120-111-102-93-84-75-66-57-48-39-30-21-12. For another example, [6:9:114] is 615243342516069788796105114. In this application, [a:b:c, d:e:f] means all integers from a to c with interval b (a, b and c are integers) and all integers from d to f with interval e (d, e and f are integers), i.e., d, (d+e), (d+2e), (d+3e),..., f; details are not repeated hereinafter. For example, [-120:9:-12, 6:9:114] means -120-111-102-93-84-75-66-57-48-39-30-21-12615243342516069788796105114. Referring to Table 3, indices of subcarriers included in a 52-tone DRU are the union of indices of subcarriers included in two 26-tone DRUs. As an example, 26-tone [DRU6, DRU 7] means indices of subcarriers included in 52-tone DRU1. In other words, indices of subcarriers included in 52-tone DRU1 are the union of indices of subcarriers included in 26-tone DRU1 and indices of subcarriers included in 26-tone DRU2. As another example, indices of subcarriers included in 52-tone DRU2 are the union of indices of subcarriers included in 26-tone DRU3 and indices of subcarriers included in 26-tone DRU4.Referring to Table 3, 26-tone [DRU1~4],[-3,3] means that the subcarriers contained in the 106-tone DRU1 are the union of the subcarriers contained in the 26-tone DRU1, the 26-tone DRU2, the 26-tone DRU3, the 26-tone DRU4 and [-3,3]. 26-tone [DRU6~9],[-2,2] means that the subcarriers contained in the 106-tone DRU2 are the union of the subcarriers contained in the 26-tone DRU6, the 26-tone DRU7, the 26-tone DRU8, the 26-tone DRU9 and [-2,2]. In this application, the DRU subcarrier planning is divided into negative half frequency and positive half frequency. Or in other words, the DRU subcarrier planning includes negative half frequency subcarrier planning and positive half frequency subcarrier planning. For example, for the 26-tone DRU1, [-120:9:-12] means the indexes of the subcarriers contained in the negative half frequency, and [6:9:114] means the indexes of the subcarriers contained in the positive half frequency.

[0364] Table 4 40M subcarrier planning

[0365] Table 4 shows the indices of data and pilot subcarriers for distributed tone RUs (DRUs) in 40MHz UHR PPDUs. Table 4 shows the indices of subcarriers contained by 18 26-tone DRUs, the indices of subcarriers contained by 8 52-tone DRUs, the indices of subcarriers contained by 4 106-tone DRUs, and the indices of subcarriers contained by 2 242-tone DRUs, respectively. As an example, [-242:18:-26, 10:18:226] indicates the indices of subcarriers contained by 26-tone DRU 1. As another example, [-242:9:-17, 10:9:235] indicates the indices of subcarriers contained by 52-tone DRU 1. As yet another example, 26-tone [DRU 1 ~ DRU 4] [-8, 5] indicates the indices of subcarriers contained by 106-tone DRU 1, i.e., the indices of subcarriers contained by 106-tone DRU 1 is the union of the indices of subcarriers contained by 26-tone DRU 1, the indices of subcarriers contained by 26-tone DRU 2, the indices of subcarriers contained by 26-tone DRU 3, the indices of subcarriers contained by 26-tone DRU 4, and [-8, 5]. The indices of subcarriers contained by one 52-tone DRU is the union of the indices of subcarriers contained by two 26-tone DRUs. As an example, 26-tone [DRU 1, DRU 2] indicates the indices of subcarriers contained by 52-tone DRU 1. As another example, 26-tone [DRU 6, DRU 7] indicates the indices of subcarriers contained by 52-tone DRU 3.

[0366] Table 5 80M subcarrier plan

[0367] Table 5 shows data and pilot subcarrier indices for distributed tone RUs (DRUs) in 80MHz UHR PPDU. Table 5 shows indices of subcarriers contained in 16 52-tone DRUs, indices of subcarriers contained in 8 106-tone DRUs, indices of subcarriers contained in 4 242-tone DRUs, and indices of subcarriers contained in 2 484-tone DRUs, respectively. As an example, [-483:36:-51, 17:36:449] [-467:36:-35, 33:36:465] indicates indices of subcarriers contained in 52-tone DRU1. As another example, 52-tone [DRU1 ~ DRU2] [-495, 485] indicates indices of subcarriers contained in 106-tone DRU1.

[0368] 5. Principles followed by DRU pilot subcarrier design

[0369] For each size of DRU, the number of pilot subcarriers is the same as that of rRU. For example, 26-tone DRU contains 2 pilot subcarriers; 52-tone DRU contains 4 pilot subcarriers; 106-tone DRU contains 4 pilot subcarriers; 242-tone DRU contains 8 pilot subcarriers; and 484-tone DRU contains 16 pilot subcarriers.

[0370] There is a hierarchical relationship among pilot subcarriers of each size of DRU. The 4 pilot subcarriers of 52-tone DRU are composed of the 2 pilot subcarriers of 26-tone DRU contained therein; the 4 pilot subcarriers of 106-tone DRU are contained in the 8 pilot subcarriers of 52-tone DRU contained therein; the 8 pilot subcarriers of 242-tone DRU are composed of the pilot subcarriers of 106-tone DRU contained therein; and the 16 pilot subcarriers of 484-tone DRU are composed of the pilot subcarriers of 242-tone DRU contained therein.

[0371] The method provided by the embodiment of the present application is described below.

[0372] FIG. 4 is a flow diagram of a communication method provided by the embodiment of the present application. The first communication device and the second communication device involved in FIG. 4 are described above, and thus are not described in detail here. As shown in FIG. 4, the method includes:

[0373] 401. The first communication device generates the OFDM symbol according to a subcarrier plan corresponding to the first discrete bandwidth.

[0374] The first discrete bandwidth can be any one of 20MHz, 40MHz, or 80MHz. The first discrete bandwidth can also be 160MHz or other bandwidths, and the present application does not limit the first discrete bandwidth and / or the subcarrier plan corresponding to the first discrete bandwidth. As an example 1, the first discrete bandwidth is 20MHz, and the subcarrier plan corresponding to the first discrete bandwidth is shown in Table 3. As another example 2, the first discrete bandwidth is 40MHz, and the subcarrier plan corresponding to the first discrete bandwidth is shown in Table 4. As another example 3, the first discrete bandwidth is 80MHz, and the subcarrier plan corresponding to the first discrete bandwidth is shown in Table 5.

[0375] The subcarrier plan corresponding to the first discrete bandwidth can be any existing subcarrier plan or a subcarrier plan corresponding to the first discrete bandwidth proposed in the future. The present application does not limit the division of each DRU in the first discrete bandwidth, the number of subcarriers included in each DRU, and the subcarriers included in each DRU. That is, for any subcarrier plan, the pilot subcarrier index in the subcarrier plan can be designed (or determined) by using the pilot design scheme provided by the present application. Or, the index range of the subcarriers included in each DRU is not limited. In a possible implementation, the first discrete bandwidth is 20MHz, and the first discrete bandwidth includes 9 26-tone DRUs. The 26-tone DRU (or the 9 26-tone DRUs) includes subcarriers with a minimum index of -120 and a maximum index of 120. As an example, the first discrete bandwidth is 20MHz, and the first discrete bandwidth includes 9 26-tone DRUs. The index range of the subcarriers included in each 26-tone DRU is shown in Table 3. In a possible implementation, the first discrete bandwidth is 40MHz, and the first discrete bandwidth includes 18 26-tone DRUs. The 26-tone DRU (or the 18 26-tone DRUs) includes subcarriers with a minimum index of -244 and a maximum index of 244. As an example, the first discrete bandwidth is 40MHz, and the first discrete bandwidth includes 18 26-tone DRUs. The index range of the subcarriers included in each 26-tone DRU is shown in Table 4. In a possible implementation, the first discrete bandwidth is 80MHz, and the first discrete bandwidth includes 16 52-tone DRUs. The 26-tone DRU (or the 16 52-tone DRUs) includes subcarriers with a minimum index of -499 and a maximum index of 500. As an example, the first discrete bandwidth is 80MHz, and the first discrete bandwidth includes 16 52-tone DRUs. The index range of the subcarriers included in each 52-tone DRU is shown in Table 5.

[0376] The present application provides a condition that the pilot subcarriers in the DRU subcarrier plan should satisfy, so that the communication performance can be improved and / or the storage cost can be reduced when the communication device transmits or receives OFDM symbols according to the DRU subcarrier plan. Or, the present application limits the condition that the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth should satisfy. As an example, the present application provides a scheme of taking which indexes in the subcarrier plan shown in Table 4, Table 5, or Table 6 as the indexes (or pilot indexes) of the pilot subcarriers. Or, the present application provides the indexes of the pilot subcarriers included in each DRU in the subcarrier plan shown in Table 4, Table 5, or Table 6.

[0377] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy the following condition 1: each DRU in the first discrete bandwidth includes subcarriers with indexes greater than 0 and subcarriers with indexes less than 0, the first and last subcarriers in the subcarriers with indexes greater than 0 are not pilot subcarriers, and the first and last subcarriers in the subcarriers with indexes less than 0 are not pilot subcarriers, because the first and last subcarriers in the subcarriers with indexes greater than 0 or less than 0 cannot obtain a smoothing filtering gain, thereby avoiding that the pilot subcarriers cannot obtain a smoothing filtering gain; the difference between indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11, thereby avoiding that the pilot subcarriers are clustered and affected by narrowband interference at the receiving end; the subcarriers with indexes less than 0 and the subcarriers with indexes greater than 0 of the pilot subcarriers in the first discrete bandwidth are opposite numbers, or each of the subcarriers with indexes less than 0 and each of the subcarriers with indexes greater than 0 of the pilot subcarriers in the first discrete bandwidth are opposite numbers, thereby the storage and reading of the pilot subcarriers can reuse the scheme of storing and reading the rRU, and the scheme of storing and reading the pilot subcarriers does not need to be redesigned.

[0378] In this application, for the convenience of subsequent reference, when referring to the conditions satisfied by the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth, different numbers are used to distinguish different conditions satisfied by the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth, but it should not be understood as a limitation on the embodiments of the present application.

[0379] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy the following condition 2: each DRU includes subcarriers with indexes greater than 0 and subcarriers with indexes less than 0, the first and last subcarriers in the subcarriers with indexes greater than 0 are not pilot subcarriers, and the first and last subcarriers in the subcarriers with indexes less than 0 are not pilot subcarriers, because the first and last subcarriers in the subcarriers with indexes greater than 0 or less than 0 cannot obtain a smoothing filtering gain, thereby avoiding that the pilot subcarriers cannot obtain a smoothing filtering gain; the difference between the indexes of any two adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11, thereby avoiding that the pilot subcarriers are affected by narrowband interference at the receiving end due to clustering; the difference between the maximum and minimum indexes of a plurality of pilot subcarriers in the first discrete bandwidth is greater than 11*n, n is equal to the number of the plurality of pilot subcarriers minus 1, and n is an integer greater than 0, and the distribution range of the pilot subcarriers (which can be referred to as pilots) is large, which is beneficial to pilot diversity. In this application, the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth refers to the difference between the absolute indexes of the adjacent pilot subcarriers in the first discrete bandwidth, that is, the difference between the index of the pilot subcarrier with a larger index and the index of the pilot subcarrier with a smaller index of the two adjacent pilot subcarriers. For example, the indexes (which can be referred to as index values) of two adjacent pilot subcarriers are -111 and -100, and the difference between the indexes of the two adjacent pilot subcarriers is 11.

[0380] 402. The first communication device transmits an OFDM symbol.

[0381] Correspondingly, the second communication device receives the OFDM symbol according to the subcarrier plan corresponding to the first discrete bandwidth.

[0382] 403. The second communication device parses the OFDM symbol.

[0383] In the embodiments of the present application, a plurality of conditions that pilot subcarriers in subcarrier planning should satisfy are provided. When the condition that the first and last subcarriers in the subcarriers with index greater than 0 or less than 0 are not pilot subcarriers is satisfied, it can be avoided that pilot subcarriers cannot obtain smooth filtering gain. When the condition that the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11 is satisfied, it can be avoided that pilot subcarriers are clustered and affected by narrowband interference at the receiving end. When the condition that the indexes less than 0 of the pilot subcarriers in the first discrete bandwidth and the indexes greater than 0 are opposite numbers or the indexes less than 0 of the pilot subcarriers in the first discrete bandwidth and the indexes greater than 0 are opposite numbers is satisfied, the storage and reading of the pilot subcarriers can reuse the scheme of the storage and reading of the rRU, and the scheme of the storage and reading of the pilot subcarriers does not need to be redesigned. When the condition that the difference between the maximum and minimum of the indexes of the plurality of pilot subcarriers in the first discrete bandwidth is greater than 11*n is satisfied, the distribution range of the pilot subcarriers is large, which is beneficial to pilot diversity.

[0384] The conditions that the pilot subcarriers (or pilot indexes) in the subcarrier planning satisfy are introduced below.

[0385] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy the above condition 1, and the above condition 1 includes that the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is equal to 11. As an example, the design process of the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth is as follows: the first and last subcarriers in each 26-tone DRU whose indexes are less than 0 are not pilot subcarriers, and the first and last subcarriers in each 26-tone DRU whose indexes are greater than 0 are not pilot subcarriers; secondly, the interval between adjacent subcarriers is ensured to be 11, for example, when the first discrete bandwidth is 20M, the index of the first pilot subcarrier can be any one of -111 to -101, for another example, when the first discrete bandwidth is 40M, the index of the first pilot subcarrier can be any one of -224 to -214, and for another example, when the first discrete bandwidth is 80M, the index of the first pilot subcarrier can be any one of -464 to -421; thirdly, the indexes of the pilot subcarriers in the first discrete bandwidth that are less than 0 and the indexes of the pilot subcarriers in the first discrete bandwidth that are greater than 0 are opposite numbers or each index of the pilot subcarriers in the first discrete bandwidth that are less than 0 and each index of the pilot subcarriers in the first discrete bandwidth that are greater than 0 are opposite numbers. The subcarrier plan corresponding to the first discrete bandwidth can be divided into a positive half frequency and a negative half frequency, the negative half frequency of the subcarrier plan corresponding to the first discrete bandwidth includes all subcarriers whose indexes are less than 0, and the positive half frequency of the subcarrier plan corresponding to the first discrete bandwidth includes all subcarriers whose indexes are greater than 0. The indexes of the pilot subcarriers in the first discrete bandwidth that are less than 0 and the indexes of the pilot subcarriers in the first discrete bandwidth that are greater than 0 can be replaced by: the pilot indexes of the positive half frequency are obtained by taking the negative of the pilot indexes of the negative half frequency, or the pilot indexes of the negative half frequency are obtained by taking the negative of the pilot indexes of the positive half frequency. The embodiments of the present application take the pilot subcarriers in the 26-tone DRU as an example to introduce the conditions satisfied by the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth, and the pilot subcarriers of other size DRU can be obtained by combining the pilot subcarriers of the 26-tone DRU.

[0386] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy condition 3 and condition 1 above, and condition 1 above includes that the difference between the indices of adjacent pilot subcarriers within the first discrete bandwidth is equal to 11. As an example, the design process of the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth is as follows: in the subcarrier plan corresponding to the first discrete bandwidth, the design of the pilot subcarriers that satisfy condition 3 and condition 1 above is determined. Condition 3 above can include one or more groups of pilot subcarriers with the same absolute value of the difference between the indices for each DRU. In a possible implementation, when one DRU contains two pilot indices, the two pilot subcarriers contained by the DRU have the same absolute value of the difference between the indices, which is a first value. As an example, the first discrete bandwidth is 20 MHz, and the absolute value of the difference between the indices of the two pilot subcarriers contained by each 26-tone DRU is 126, that is, the first value is 126. As another example, the first discrete bandwidth is 40 MHz, and the absolute value of the difference between the indices of the two pilot subcarriers contained by each 26-tone DRU is 252, that is, the first value is 252. In a possible implementation, when one DRU contains four pilot indices, the DRU contains two groups of pilot subcarriers with the same absolute value of the difference between the indices, each group containing two pilot subcarriers. As an example, the first discrete bandwidth is 80 MHz, and each 52-tone DRU contains two groups of pilot subcarriers with the same absolute value of the difference between the indices, which is a second value. For example, in the subcarrier plan corresponding to the first discrete bandwidth, the indices of the subcarriers contained by 52-tone DRU1 range from -483:36:-51, 17:36:449 and -467:36:-35, 33:36:465, and the indices of the pilot subcarriers contained by DRU1 are -195, -107, 305, and 393, where -195 and 305 are the indices of one group of pilot subcarriers with the same absolute value of the difference between the indices, which is 500, and -107 and 393 are the indices of another group of pilot subcarriers with the same absolute value of the difference between the indices, which is 500.

[0387] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy the condition 4 and the above condition 1, and the above condition 1 includes that the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is equal to 11. As an example, the design process of the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth is as follows: in the subcarrier plan corresponding to the first discrete bandwidth, the design of the pilot subcarriers that satisfy the condition 4 and the above condition 1 at the same time is determined. Optionally, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth also satisfy the above condition 3. The above condition 4 can be that different DRUs contain one or more groups of pilot subcarriers with the same or similar difference between the relative indexes. In this application, the difference between the relative indexes of a group of pilot subcarriers (or two pilot subcarriers) contained by a DRU refers to the difference between the ordering value of the index of the pilot subcarrier with the index less than 0 in the indexes of all subcarriers contained by the DRU and the ordering value of the index of the pilot subcarrier with the index greater than 0 in the indexes of all subcarriers contained by the DRU. For the convenience of understanding, the difference between the relative indexes of a group of pilot subcarriers (or two pilot subcarriers) contained by a DRU is described below in combination with Table 6. Table 6 is an example of pilot design of a 20M tone plan provided by an embodiment of the present application. Or in other words, Table 6 shows an example of pilot indexes of a 20M bandwidth 26-tone DRU. The pilot design shown in Table 6 satisfies the above condition 1, the above condition 3 and the above condition 4 at the same time.

[0388] Table 6 Pilot indexes of a 20M bandwidth 26-tone DRU

[0389] Referring to Table 6, the first 9 rows are for the negative half of the 20M tone plan, i.e., the negative half tone plan, each of the first 9 rows shows the indices of the subcarriers with index less than 0 contained in one of the 26-tone DRU1 to 26-tone DRU9, for example, the first row shows the indices of the subcarriers with index less than 0 contained in the 26-tone DRU1; the last 9 rows (i.e., the 12th row to the 20th row) are for the positive half of the 20M tone plan, i.e., the positive half tone plan, each of the 12th row to the 20th row shows the indices of the subcarriers with index greater than 0 contained in one of the 26-tone DRU1 to 26-tone DRU9, for example, the 12th row shows the indices of the subcarriers with index greater than 0 contained in the 26-tone DRU1. In each table in the present application (including Table 6, Table 7 below, Table 8-1, etc.), the indices marked in bold and underlined are the indices of the pilot subcarriers. For example, the indices of the pilot subcarriers contained in the 26-tone DRU1 (corresponding to the first row and the 12th row) are -30 and 96, and the indices of the pilot subcarriers contained in the 26-tone DRU2 (corresponding to the 5th row and the 16th row) are -107 and 19.

[0390] Here, it is uniformly explained that the index range of the subcarriers contained in each DRU shown in each table in the present application is only an example, and the present application does not limit the index range of the subcarriers contained in each DRU. For example, Table 1 shows that the index range of the subcarriers contained in the DRU1 is [-120:9:-12] and [6:9:114], and the indices of the pilot subcarriers in the DRU1 are -30 and 96, and the index range of the subcarriers contained in the DRU1 can be other ranges, instead of including [-120:9:-12] and [6:9:114]. In addition, in the present application, the serial numbers of the DRUs (e.g., DRU1 to DRU9) are only for distinguishing the DRUs containing different subcarriers, i.e., the serial numbers of the DRUs are only examples. That is, the present application does not limit the subcarriers contained in each DRU.

[0391] The following describes the ordering values of the indices of the pilot subcarriers included in a DRU with an index less than 0 in the indices of the subcarriers included in the DRU and the ordering values of the indices of the pilot subcarriers included in a DRU with an index greater than 0 in the indices of the subcarriers included in the DRU, using the 26-tone DRU1 and the 26-tone DRU2 as examples. Referring to Table 6, the indices of the subcarriers included in each DRU are arranged in ascending order. As an example, the ordering value of the index of the pilot subcarrier included in the 26-tone DRU1 with an index less than 0 (i.e., -30 in the first row) in the indices of the subcarriers included in the 26-tone DRU1 is 11, the ordering value of the index of the pilot subcarrier included in the 26-tone DRU1 with an index greater than 0 (i.e., 96 in the twelfth row) in the indices of the subcarriers included in the 26-tone DRU1 is 24, and the difference between the relative indices of the group of pilot subcarriers (or two pilot subcarriers) included in the 26-tone DRU1 (i.e., 24-11) is 13. As another example, the ordering value of the index of the pilot subcarrier included in the 26-tone DRU2 with an index less than 0 (i.e., -107 in the fifth row) in the indices of the subcarriers included in the 26-tone DRU2 is 2, the ordering value of the index of the pilot subcarrier included in the 26-tone DRU2 with an index greater than 0 (i.e., 19 in the sixteenth row) in the indices of the subcarriers included in the 26-tone DRU2 is 15, and the difference between the relative indices of the two pilot subcarriers included in the 26-tone DRU2 (i.e., 15-2) is 13.

[0392] The relative index difference is close means that the difference of the two relative index differences is less than a threshold (not limited, for example, the threshold is 2). For example, the first discrete bandwidth is 20MHz, the relative index difference of the two pilot subcarriers contained in the 26-tone DRU1 is 13, that is, the 26-tone DRU1 contains a group of pilot subcarriers with a relative index difference of 13, the relative index difference of the two pilot subcarriers contained in the 26-tone DRU9 is 14, that is, the 26-tone DRU9 contains a group of pilot subcarriers with a relative index difference of 14, since the difference of the two relative index differences (i.e. 13 and 14) is less than the threshold (for example, 2), therefore the 26-tone DRU1 and the 26-tone DRU9 contain a group of pilot subcarriers with close relative index differences. In a possible implementation, the above condition 4 can be that each DRU contains one or more groups of pilot subcarriers with a relative index difference of 13 or 14. As an example, the first discrete bandwidth is 20MHz or 40MHz, the above condition 4 is that the relative index difference of the two pilot subcarriers contained in each 26-tone DRU is 13 or 14, thereby the storage can be simplified by storing the offset of the relative pilot index. As another example, the first discrete bandwidth is 80MHz, each 52-tone DRU contains 4 pilot subcarriers, and the above condition 4 is that each 52-tone DRU contains two groups of pilot subcarriers with a relative index difference of 13 or 14, and each group contains two pilot subcarriers.

[0393] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy condition 5 and condition 1, and the condition 1 includes that the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is equal to 11. As an example, the design process of the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth is as follows: in the subcarrier plan corresponding to the first discrete bandwidth, the design of the pilot subcarriers that satisfy condition 5 and condition 1 at the same time is determined. Optionally, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth also satisfy condition 3 and / or condition 4. Condition 5 can be that the relative positions of the pilot subcarriers in the positive and negative half subcarrier plans are the same or similar, so that only half (positive half or negative half) of the relative pilot index storage is performed, thereby simplifying the storage. Alternatively, condition 5 can be that the relative positions of the pilot subcarriers in the positive half of the subcarrier plan corresponding to the first discrete bandwidth are the same or similar to the relative positions of the pilot subcarriers in the negative half of the subcarrier plan corresponding to the first discrete bandwidth. The relative positions of the pilot subcarriers in the positive and negative half subcarrier plans being the same can be that the ordering values corresponding to the indexes of the two pilot subcarriers in each 26-tone DRU are the same. The relative positions of the pilot subcarriers in the positive and negative half subcarrier plans being similar can be that the absolute value of the difference between the ordering values corresponding to the indexes of the two pilot subcarriers in each 26-tone DRU is less than a certain threshold, for example, 1. For example, the relative positions of the pilot subcarriers in the positive and negative half subcarrier plans being similar is that the ordering values corresponding to the indexes of the two pilot subcarriers in each 26-tone DRU are different by 1. The ordering values corresponding to the indexes of the two pilot subcarriers in each 26-tone DRU include the ordering value of the index of the pilot subcarrier with the index greater than 0 in the indexes of the subcarriers with the index greater than 0 included in the DRU, and the ordering value of the index of the pilot subcarrier with the index less than 0 in the indexes of the subcarriers with the index less than 0 included in the DRU. Referring to Table 6, the first row and the twelfth row of Table 6 show the indexes of the subcarriers included in the 26-tone DRU1, where -30 is the index of the pilot subcarrier with the index less than 0 included in the 26-tone DRU1, 96 is the index of the pilot subcarrier with the index greater than 0 included in the 26-tone DRU1, the ordering value of the index of the pilot subcarrier with the index greater than 0 included in the 26-tone DRU1 (that is, 96) in the indexes of the subcarriers with the index greater than 0 included in the 26-tone DRU1 is 11, and the ordering value of the index of the pilot subcarrier with the index less than 0 included in the 26-tone DRU1 (that is, -30) in the indexes of the subcarriers with the index less than 0 included in the 26-tone DRU1 is 11.Referring to Table 6, the ninth row and the twentieth row of Table 6 show the indexes of the subcarriers included in the 26-tone DRU 5, wherein -85 is the index of the pilot subcarrier included in the 26-tone DRU 5 with the index less than 0, 41 is the index of the pilot subcarrier included in the 26-tone DRU 5 with the index greater than 0, the ordering value of the index of the pilot subcarrier included in the 26-tone DRU 5 with the index greater than 0 (i.e., 41) in the indexes of the subcarriers included in the 26-tone DRU 5 with the index greater than 0 is 5, and the ordering value of the index of the pilot subcarrier included in the 26-tone DRU 5 with the index less than 0 (i.e., -85) in the indexes of the subcarriers included in the 26-tone DRU 5 with the index less than 0 is 4.

[0394] The following describes examples of the pilot indexes (or pilot subcarriers in the subcarrier planning corresponding to the first discrete bandwidth) of the 26-tone DRU in different bandwidths provided in the present application in combination with the above Table 6, the following Table 7, Table 8-1, Table 8-2, Table 9, Table 10, Table 11-1 and Table 11-2. The pilot indexes of the 26-tone DRU shown in the above Table 6, the following Table 7, Table 8-1, Table 8-2, Table 9, Table 10, Table 11-1 and Table 11-2 all satisfy the above condition 1. The pilot indexes of the 26-tone DRU shown in the above Table 6, the following Table 7, Table 8-1 and Table 8-2 also satisfy one or more of the above condition 3, the above condition 4 or the above condition 5.

[0395] Table 6 shows an example of the pilot indexes of the 26-tone DRU in the 20M bandwidth. The pilot design shown in Table 6 can simultaneously satisfy the above condition 1, the above condition 3, the above condition 4 and the above condition 5. Table 6 can be designed according to one or more of the above condition 1, the above condition 3, the above condition 4 and the above condition 5. For example, Table 6 is designed according to the above condition 1 and the above condition 4. For another example, Table 6 is designed according to the above condition 1, the above condition 3 and the above condition 5. Table 6 simultaneously satisfies that the pilot indexes of the positive half frequency and the negative half frequency are opposite numbers, i.e., the indexes of the pilot subcarriers with the index less than 0 and the indexes of the pilot subcarriers with the index greater than 0 in the first discrete bandwidth are opposite numbers, and the difference between the relative indexes of the two pilot subcarriers of each 26-tone DRU is the same / close. One example of designing Table 6 is as follows: the difference between the indexes of the adjacent pilot subcarriers is fixed as 11, when the first pilot index (i.e., the smallest index less than 0) is -107, the last pilot index (i.e., the largest index less than 0) is -19, starting from the opposite number 19 of -19, the pilot indexes between 19 and 107 are obtained by taking the opposite numbers in turn.

[0396] Another description of the pilot indices of the 20M bandwidth 26-tone DRU shown in Table 6 is as follows: the first discrete bandwidth (20M) includes DRU1 to DRU9, each DRU including 26 subcarriers, DRU1 to DRU9 satisfying:

[0397] DRU1 includes subcarriers with index range [-120:9:-12] and [6:9:114], and DRU1 includes pilot subcarriers with indices -30 and 96;

[0398] DRU2 includes subcarriers with index range [-116:9:-8] and [10:9:118], and DRU2 includes pilot subcarriers with indices -107 and 19;

[0399] DRU3 includes subcarriers with index range [-118:9:-10] and [8:9:116], and DRU3 includes pilot subcarriers with indices -19 and 107;

[0400] DRU4 includes subcarriers with index range [-114:9:-6] and [12:9:120], and DRU4 includes pilot subcarriers with indices -96 and 30;

[0401] DRU5 includes subcarriers with index range [-112:9:-4] and [5:9:113], and DRU5 includes pilot subcarriers with indices -85 and 41;

[0402] DRU6 includes subcarriers with index range [-119:9:-11] and [7:9:115], and DRU6 includes pilot subcarriers with indices -74 and 52;

[0403] DRU7 includes subcarriers with index range [-115:9:-7] and [11:9:119], and DRU7 includes pilot subcarriers with indices -52 and 74;

[0404] DRU8 includes subcarriers with index range [-117:9:-9] and [9:9:117], and DRU8 includes pilot subcarriers with indices -63 and 63;

[0405] DRU9 includes subcarriers with index range [-113:9:-5] and [4:9:112], and DRU9 includes pilot subcarriers with indices -41 and 85.

[0406] It should be noted that the index range of the subcarriers included in each of the above DRU1 to DRU9 is only an example, and the index range of the subcarriers included in each DRU can be other ranges.

[0407] Table 7 is an example of pilot design of a 40M tone plan provided by the embodiments of the present application. Alternatively, Table 7 shows an example of pilot index of 40M bandwidth 26-tone DRU. The pilot design shown in Table 7 can simultaneously satisfy the above condition 1, the above condition 3, the above condition 4 and the above condition 5. Table 7 can be designed according to one or more of the above condition 1, the above condition 3, the above condition 4 and the above condition 5. For example, Table 7 is designed according to the above condition 1 and the above condition 4. For another example, Table 7 is designed according to the above condition 1, the above condition 3 and the above condition 5.

[0408] Table 7 Pilot index of 40M bandwidth 26-tone DRU

[0409] Referring to Table 7, the first 18 rows are the negative half frequency of the 40M tone plan, i.e. the negative half frequency tone plan, each of the first row to the eighteenth row shows the index of the subcarrier with index less than 0 contained in one of the 26-tone DRU1 to 26-tone DRU18, for example, the first row shows the index of the subcarrier with index less than 0 contained in the 26-tone DRU1. The last 18 rows (i.e. the twenty-second row to the thirty-ninth row) are the positive half frequency of the 40M tone plan, i.e. the positive half frequency tone plan, each of the twenty-second row to the thirty-ninth row shows the index of the subcarrier with index greater than 0 contained in one of the 26-tone DRU1 to 26-tone DRU18, for example, the twenty-second row shows the index of the subcarrier with index greater than 0 contained in the 26-tone DRU1. For example, the 26-tone DRU1 (corresponding to the first row and the twenty-second row) contains pilot subcarriers with indexes -170 and 82, and the 26-tone DRU2 (corresponding to the tenth row and the thirty-first row) contains pilot subcarriers with indexes -71 and 181. Table 7 simultaneously satisfies that the pilot indexes of the positive half frequency and the negative half frequency are opposite numbers (except -27 and 225), and the difference between the relative indexes of the two pilot subcarriers in each 26-tone DRU is the same. An example of designing Table 7 is as follows: the difference between the indexes of adjacent pilot subcarriers is fixed as 11, when the first pilot index (i.e. the smallest index less than 0) is -214, the last pilot index (the largest index less than 0) is -27, -27 is taken as the first subcarrier in a certain 26-tone DRU in the positive half frequency, which is not conducive to channel coefficient smoothing filtering, so 27 is discarded, and from 38 which is the opposite number of -38, the opposite numbers are taken in turn to obtain the pilot indexes between 38 and 214, and finally 225 is added.

[0410] Another description of the pilot indices of the 40M bandwidth 26-tone DRU shown in Table 7 is as follows: the first discrete bandwidth (40M) includes DRU1 to DRU18, each DRU including 26 subcarriers, DRU1 to DRU18 satisfying:

[0411] DRU1 includes subcarriers with index range [-242:18:-26] and [10:18:226], and DRU1 includes pilot subcarriers with indices -170 and 82;

[0412] DRU2 includes subcarriers with index range [-233:18:-17] and [19:18:235], and DRU2 includes pilot subcarriers with indices -71 and 181;

[0413] DRU3 includes subcarriers with index range [-238:18:-22] and [14:18:230], and DRU3 includes pilot subcarriers with indices -148 and 104;

[0414] DRU4 includes subcarriers with index range [-229:18:-13] and [23:18:239], and DRU4 includes pilot subcarriers with indices -49 and 203;

[0415] DRU5 includes subcarriers with index range [-225:18:-9] and [27:18:243], and DRU5 includes pilot subcarriers with indices -27 and 225;

[0416] DRU6 includes subcarriers with index range [-240:18:-24] and [12:18:228], and DRU6 includes pilot subcarriers with indices -60 and 192;

[0417] DRU7 includes subcarriers with index range [-231:18:-15] and [21:18:237], and DRU7 includes pilot subcarriers with indices -159 and 93;

[0418] DRU8 includes subcarriers with index range [-236:18:-20] and [16:18:232], and DRU8 includes pilot subcarriers with indices -38 and 214;

[0419] DRU9 includes subcarriers with index range [-227:18:-11] and [25:18:241], and DRU9 includes pilot subcarriers with indices -137 and 115;

[0420] The index range of the subcarriers contained in the DRU 10 is [-241:18:-25] and [11:18:227], and the indexes of the pilot subcarriers contained in the DRU 10 are -115 and 137;

[0421] The index range of the subcarriers contained in the DRU 11 is [-232:18:-16] and [20:18:236], and the indexes of the pilot subcarriers contained in the DRU 11 are -214 and 38;

[0422] The index range of the subcarriers contained in the DRU 12 is [-237:18:-21] and [15:18:231], and the indexes of the pilot subcarriers contained in the DRU 12 are -93 and 159;

[0423] The index range of the subcarriers contained in the DRU 13 is [-228:18:-12] and [24:18:240], and the indexes of the pilot subcarriers contained in the DRU 13 are -192 and 60;

[0424] The index range of the subcarriers contained in the DRU 14 is [-234:18:-18] and [18:18:234], and the indexes of the pilot subcarriers contained in the DRU 14 are -126 and 126;

[0425] The index range of the subcarriers contained in the DRU 15 is [-239:18:-23] and [13:18:229], and the indexes of the pilot subcarriers contained in the DRU 15 are -203 and 49;

[0426] The index range of the subcarriers contained in the DRU 16 is [-230:18:-14] and [22:18:238], and the indexes of the pilot subcarriers contained in the DRU 16 are -104 and 148;

[0427] The index range of the subcarriers contained in the DRU 17 is [-235:18:-19] and [17:18:233], and the indexes of the pilot subcarriers contained in the DRU 17 are -181 and 71;

[0428] The index range of the subcarriers contained in the DRU 18 is [-226:18:-10] and [26:18:242], and the indexes of the pilot subcarriers contained in the DRU 18 are -82 and 170.

[0429] It should be noted that the index range of the subcarriers contained in each of the DRU1 to DRU18 is only an example, and the index range of the subcarriers contained in each DRU can be other ranges.

[0430] Table 8-1 and Table 8-2 collectively show an example of pilot indices for 80M bandwidth 52-tone DRU. Table 8-1 and Table 8-2 can be considered as one table. For example, each row of the table includes indices of 26 subcarriers, and the indices of the subcarriers in the nth row of the table are the union of the indices of the subcarriers in the nth row of Table 8-1 and the indices of the subcarriers in the nth row of Table 8-2. n is an integer greater than 0. For another example, each row of the table includes indices of 52 subcarriers, and the indices of the subcarriers in the nth row of the table are the union of the indices of the subcarriers included in the nth row of Table 8-1, the indices of the subcarriers included in the nth row of Table 8-2, the indices of the subcarriers included in the (n+16)th row of Table 8-1, and the indices of the subcarriers included in the (n+16)th row of Table 8-2.

[0431] The pilot design shown in Table 8-1 and Table 8-2 can satisfy the above condition 1, the above condition 3, the above condition 4, and the above condition 5 at the same time. The pilot design shown in Table 8-1 and Table 8-2 can be designed according to one or more of the above condition 1, the above condition 3, the above condition 4, and the above condition 5. For example, the pilot design shown in Table 8-1 and Table 8-2 is designed according to the above condition 1 and the above condition 4. For another example, the pilot design shown in Table 8-1 and Table 8-2 is designed according to the above condition 1, the above condition 3, and the above condition 5. In some possible implementation, the 80M Tone Plan gives a Tone Plan with a minimum of 52-tone DRU, refer to Table 5. In the pilot design process, the 52-tone DRU Tone Plan can be first split into a Tone Plan based on 26-tone DRU, and then the 52-tone DRU Tone Plan can be obtained by merging the 26-tone DRU Tone Plan.

[0432] Table 8-1

[0433] Table 8-2

[0434] The union of the indices of the subcarriers contained in the nth row of Table 8-1 and the indices of the subcarriers contained in the nth row of Table 8-2 is the indices of the subcarriers contained in a 26-tone DRU1. n can be any integer greater than 0 and less than 19. That is, the same row of Table 8-1 and Table 8-2 shows the indices of the subcarriers contained in a 26-tone DRU1. For example, the first row through the thirty-second row of Table 8-1 and the first row through the thirty-second row of Table 8-2 collectively show the indices of the subcarriers contained in 26-tone DRU1 through 26-tone DRU32, respectively. The 26-tone DRU1 through 26-tone DRU16 and the 26-tone DRU17 through 26-tone DRU32 shown in the pilot design of Table 8-1 and Table 8-2 respectively combine to form a 52-tone DRU, which in fact does not exist. Referring to Table 8-1 and Table 8-2, the union of the indices of the subcarriers contained in the nth row of Table 8-1, the indices of the subcarriers contained in the nth row of Table 8-2, the indices of the subcarriers contained in the (n+16)th row of Table 8-1, and the indices of the subcarriers contained in the (n+16)th row of Table 8-2 is the indices of the subcarriers contained in a 52-tone DRU. In one possible implementation, the first communication device and the second communication device can store a table for determining the pilot indices of an 80M bandwidth 52-tone DRU, where the nth row of the table contains the union of the indices of the subcarriers contained in the nth row of Table 8-1, the indices of the subcarriers contained in the nth row of Table 8-2, the indices of the subcarriers contained in the (n+16)th row of Table 8-1, and the indices of the subcarriers contained in the (n+16)th row of Table 8-2, i.e., the table can be formed by combining Table 8-1 and Table 8-2.

[0435] Table 8-1 and Table 8-2 collectively show the pilot indices included in the 52-tone DRU1 through the 52-tone DRU16, respectively. For example, the union of the indices of the subcarriers included in the first row of Table 8-1 and the first row of Table 8-2 (i.e., [-483:36:-51, 17:36:449]) and the indices of the subcarriers included in the seventeenth row of Table 8-1 and the seventeenth row of Table 8-2 (i.e., [-467:36:-35, 33:36:465]) is the indices of the subcarriers included in the 52-tone DRU1, and the pilot indices included in the 52-tone DRU1 include -195, -107, 305, and 393. As another example, the union of the indices of the subcarriers included in the ninth row of Table 8-1 and the ninth row of Table 8-2 (i.e., [-475:36:-43, 25:36:457]) and the indices of the subcarriers included in the twenty-fifth row of Table 8-1 and the twenty-fifth row of Table 8-2 (i.e., [-459:36:-27, 41:36:473]) is the indices of the subcarriers included in the 52-tone DRU2, and the pilot indices included in the 52-tone DRU2 include -151, -63, 349, and 437. The pilot designs shown in Table 8-1 and Table 8-2 satisfy the conditions that the pilot indices in the positive half of the frequency band are the negatives of the pilot indices in the negative half of the frequency band (except for -52 and 448), and the difference between the relative indices of the two pilot subcarriers in each 26-tone DRU is the same. One example of how Table 8-1 and Table 8-2 are derived is as follows: the difference between the indices of adjacent pilot subcarriers is fixed at 11, and when the first pilot index (i.e., the smallest index that is less than 0) is -437, the last pilot index (the largest index that is less than 0) is -52, -52 is negated to be the first subcarrier in a 26-tone DRU in the positive half of the frequency band, which is not conducive to channel coefficient smoothing filtering, so -52 is discarded, and starting from 63, which is the negation of -63, the pilot indices between 63 and 437 are obtained by negating in turn, and finally 448 is added.

[0436] Another way to describe the pilot indices of the 80M bandwidth 26-tone DRUs shown in Table 8-1 and Table 8-2 is as follows: a first discrete bandwidth (80M) includes DRU1 through DRU16, each DRU includes 52 subcarriers, and DRU1 through DRU16 satisfy:

[0437] The indices of the subcarriers included in DRU1 range from [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465], and the pilot subcarriers included in DRU1 have indices -195, -107, 305, and 393;

[0438] The index range of subcarriers contained in the DRU2 is [-475:36:-43, 25:36:457] and [-459:36:-27, 41:36:473], and the indexes of pilot subcarriers contained in the DRU2 are -151, -63, 349 and 437;

[0439] The index range of subcarriers contained in the DRU3 is [-479:36:-47, 21:36:453] and [-463:36:-31, 37:36:469], and the indexes of pilot subcarriers contained in the DRU3 are -371, -283, 129 and 217;

[0440] The index range of subcarriers contained in the DRU4 is [-471:36:-39, 29:36:461] and [-455:36:-23, 45:36:477], and the indexes of pilot subcarriers contained in the DRU4 are -327, -239, 173 and 261;

[0441] The index range of subcarriers contained in the DRU5 is [-477:36:-45, 23:36:455] and [-461:36:-29, 39:36:471], and the indexes of pilot subcarriers contained in the DRU5 are -261, -173, 239 and 327;

[0442] The index range of subcarriers contained in the DRU6 is [-469:36:-37, 31:36:463] and [-453:36:-21, 47:36:479], and the indexes of pilot subcarriers contained in the DRU6 are -217, -129, 283 and 371;

[0443] The index range of subcarriers contained in the DRU7 is [-481:36:-49, 19:36:451] and [-465:36:-33, 35:36:467], and the indexes of pilot subcarriers contained in the DRU7 are -393, -85, 107 and 415;

[0444] The index range of subcarriers contained in the DRU8 is [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475], and the indexes of pilot subcarriers contained in the DRU8 are -437, -349, 63 and 151;

[0445] The index range of subcarriers contained in the DRU9 is [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466], and the indexes of pilot subcarriers contained in the DRU9 are -338, -250, 162 and 250;

[0446] The index range of the subcarriers included in the DRU 10 is [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474], and the indexes of the pilot subcarriers included in the DRU 10 are -294, -206, 206, and 294.

[0447] The index range of the subcarriers included in the DRU 11 is [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470], and the indexes of the pilot subcarriers included in the DRU 11 are -426, -118, 74, and 382.

[0448] The index range of the subcarriers included in the DRU 12 is [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478], and the indexes of the pilot subcarriers included in the DRU 12 are -382, -74, 118, and 426.

[0449] The index range of the subcarriers included in the DRU 13 is [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472], and the indexes of the pilot subcarriers included in the DRU 13 are -404, -316, 96, and 184.

[0450] The index range of the subcarriers included in the DRU 14 is [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480], and the indexes of the pilot subcarriers included in the DRU 14 are -360, -272, 140, and 228.

[0451] The index range of the subcarriers included in the DRU 15 is [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468], and the indexes of the pilot subcarriers included in the DRU 15 are -228, -140, 272, and 360.

[0452] The index range of the subcarriers included in the DRU 16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476], and the indexes of the pilot subcarriers included in the DRU 16 are -184, -96, 316, and 404.

[0453] It should be noted that the index range of the subcarriers included in each of the DRUs 1 to 16 is only an example, and the index range of the subcarriers included in each of the DRUs can be other ranges.

[0454] Table 9 provides another example of pilot design for a 20M tone plan according to the embodiments of the present application. Alternatively, Table 9 shows another example of pilot indices for a 20M bandwidth 26-tone DRU. The pilot design shown in Table 9 satisfies condition 1 described above, which includes that the difference between indices of adjacent pilot subcarriers within the first discrete bandwidth (20M) is equal to 11, and each index smaller than 0 within the first discrete bandwidth is the opposite number of each index larger than 0.

[0455] Table 9 Pilot indices for a 20M bandwidth 26-tone DRU

[0456] Referring to Table 9, the first 9 rows are for the negative half of the 20M tone plan, each of the first 9 rows shows indices of subcarriers with index smaller than 0 included in one of 26-tone DRU 1 to 26-tone DRU 9, for example, the first row shows indices of subcarriers with index smaller than 0 included in 26-tone DRU 1; the last 9 rows (i.e., the 12th row to the 20th row) are for the positive half of the 20M tone plan, each of the 12th row to the 20th row shows indices of subcarriers with index larger than 0 included in one of 26-tone DRU 1 to 26-tone DRU 9, for example, the 12th row shows indices of subcarriers with index larger than 0 included in 26-tone DRU 1. For example, 26-tone DRU 1 (corresponding to the first row and the 12th row) includes pilot subcarriers with indices -111 and 78, and 26-tone DRU 2 (corresponding to the fifth row and the 16th row) includes pilot subcarriers with indices -89 and 100. The pilot design shown in Table 9 satisfies both the condition that the difference between indices of adjacent pilot subcarriers is equal to 11, and the condition that the pilot indices of the positive half are the opposite numbers of the pilot indices of the negative half. One example of designing Table 9 is as follows: fix the difference between indices of adjacent pilot subcarriers as 11, when the first pilot index (i.e., the smallest index smaller than 0) is -111, the last pilot index (the largest index smaller than 0) is -23, and then take the opposite numbers from 23, which is the opposite number of -23, to obtain the pilot indices between 23 and 111.

[0457] Another description of the pilot indices for a 20M bandwidth 26-tone DRU shown in Table 9 is as follows: the first discrete bandwidth (20M) includes DRU 1 to DRU 9, each of DRU 1 to DRU 9 includes 26 subcarriers, and DRU 1 to DRU 9 satisfy:

[0458] DRU 1 includes subcarriers with indices in the range of [-120:9:-12] and [6:9:114], and DRU 1 includes pilot subcarriers with indices -111 and 78;

[0459] The index range of the subcarriers included in the DRU2 is [-116:9:-8] and [10:9:118], and the indexes of the pilot subcarriers included in the DRU2 are -89 and 100;

[0460] The index range of the subcarriers included in the DRU3 is [-118:9:-10] and [8:9:116], and the indexes of the pilot subcarriers included in the DRU3 are -100 and 89;

[0461] The index range of the subcarriers included in the DRU4 is [-114:9:-6] and [12:9:120], and the indexes of the pilot subcarriers included in the DRU4 are -78 and 111;

[0462] The index range of the subcarriers included in the DRU5 is [-112:9:-4] and [5:9:113], and the indexes of the pilot subcarriers included in the DRU5 are -67 and 23;

[0463] The index range of the subcarriers included in the DRU6 is [-119:9:-11] and [7:9:115], and the indexes of the pilot subcarriers included in the DRU6 are -56 and 34;

[0464] The index range of the subcarriers included in the DRU7 is [-115:9:-7] and [11:9:119], and the indexes of the pilot subcarriers included in the DRU7 are -34 and 56;

[0465] The index range of the subcarriers included in the DRU8 is [-117:9:-9] and [9:9:117], and the indexes of the pilot subcarriers included in the DRU8 are -45 and 45;

[0466] The index range of the subcarriers included in the DRU9 is [-113:9:-5] and [4:9:112], and the indexes of the pilot subcarriers included in the DRU9 are -23 and 67.

[0467] It should be noted that the index range of the subcarriers included in each of the DRU1 to DRU9 is only an example, and the index range of the subcarriers included in each DRU can be other ranges.

[0468] Table 10 is an example of pilot design of another 40M tone plan provided by the embodiment of the present application. In other words, Table 10 shows another example of pilot index of 40M bandwidth 26-tone DRU. The pilot design shown in Table 10 satisfies the above condition 1, which includes that the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth (20M) is equal to 11, and each index less than 0 and each index greater than 0 of the pilot subcarriers in the first discrete bandwidth are opposite numbers.

[0469] Table 10 Pilot Index for 40MHz Bandwidth 26-tone DRU

[0470] Referring to Table 10, the first 18 rows represent the negative half-frequency of the 40M tone plan. Each row from the first to the eighteenth shows the index of a subcarrier with an index less than 0 contained in one of the 26-tone DRU1 to 26-tone DRU18. For example, the first row represents the index of the subcarrier with an index less than 0 contained in 26-tone DRU1. The last 18 rows (i.e., rows twenty-two to thirty-nine) represent the positive half-frequency of the 40M tone plan. Each row from the twenty-second to the thirty-ninth shows the index of a subcarrier with an index greater than 0 contained in one of the 26-tone DRU1 to 26-tone DRU18. For example, the twenty-second row represents the index of the subcarrier with an index greater than 0 contained in 26-tone DRU1. For instance, the pilot subcarrier indices in 26-tone DRU1 (corresponding to rows one and twenty-two) are -224 and 136, and the pilot subcarrier indices in 26-tone DRU2 (corresponding to rows ten and thirty-one) are -125 and 37. The pilot design shown in Table 10 simultaneously satisfies the following conditions: the difference between the indices of adjacent pilot subcarriers is equal to 11, and the pilot indices of the positive and negative half-frequency are opposites of each other. An example of the design obtained in Table 10 is as follows: the difference between the indices of adjacent pilot subcarriers is fixed at 11. When the first pilot index (i.e., the smallest index less than 0) is -224, the last pilot index (the largest index less than 0) is -37. Starting from 37, the opposite of -37, the inverses are taken sequentially to obtain pilot indices between 37 and 224.

[0471] Another way to describe the pilot index of the 40MHz bandwidth 26-tone DRU shown in Table 10 is as follows: The first discrete bandwidth (40MHz) includes DRU1 to DRU18, each DRU including 26 subcarriers, and DRU1 to DRU18 satisfy:

[0472] The index range of the subcarriers contained in DRU1 is [-242:18:-26] and [10:18:226], and the index of the pilot subcarriers contained in DRU1 is -224 and 136;

[0473] The index range of the subcarriers included in DRU2 is [-233:18:-17] and [19:18:235], and the index of the pilot subcarriers included in DRU2 is -125 and 37;

[0474] The index range of the subcarriers included in DRU3 is [-238:18:-22] and [14:18:230], and the index of the pilot subcarriers included in DRU3 is -202 and 158;

[0475] The index range of subcarriers contained in DRU4 is [-229:18:-13] and [23:18:239], and the indexes of pilot subcarriers contained in DRU4 are -103 and 59;

[0476] The index range of subcarriers contained in DRU5 is [-225:18:-9] and [27:18:243], and the indexes of pilot subcarriers contained in DRU5 are -81 and 81;

[0477] The index range of subcarriers contained in DRU6 is [-240:18:-24] and [12:18:228], and the indexes of pilot subcarriers contained in DRU6 are -114 and 48;

[0478] The index range of subcarriers contained in DRU7 is [-231:18:-15] and [21:18:237], and the indexes of pilot subcarriers contained in DRU7 are -213 and 147;

[0479] The index range of subcarriers contained in DRU8 is [-236:18:-20] and [16:18:232], and the indexes of pilot subcarriers contained in DRU8 are -92 and 70;

[0480] The index range of subcarriers contained in DRU9 is [-227:18:-11] and [25:18:241], and the indexes of pilot subcarriers contained in DRU9 are -191 and 169;

[0481] The index range of subcarriers contained in DRU10 is [-241:18:-25] and [11:18:227], and the indexes of pilot subcarriers contained in DRU10 are -169 and 191;

[0482] The index range of subcarriers contained in DRU11 is [-232:18:-16] and [20:18:236], and the indexes of pilot subcarriers contained in DRU11 are -70 and 92;

[0483] The index range of subcarriers contained in DRU12 is [-237:18:-21] and [15:18:231], and the indexes of pilot subcarriers contained in DRU12 are -147 and 213;

[0484] The index range of subcarriers contained in DRU13 is [-228:18:-12] and [24:18:240], and the indexes of pilot subcarriers contained in DRU13 are -48 and 114;

[0485] The index range of the subcarriers included in the DRU 14 is [-234:18:-18] and [18:18:234], and the index of the pilot subcarrier included in the DRU 14 is -180 and 180;

[0486] The index range of the subcarriers included in the DRU 15 is [-239:18:-23] and [13:18:229], and the index of the pilot subcarrier included in the DRU 15 is -59 and 103;

[0487] The index range of the subcarriers included in the DRU 16 is [-230:18:-14] and [22:18:238], and the index of the pilot subcarrier included in the DRU 16 is -158 and 202;

[0488] The index range of the subcarriers included in the DRU 17 is [-235:18:-19] and [17:18:233], and the index of the pilot subcarrier included in the DRU 17 is -37 and 125;

[0489] The index range of the subcarriers included in the DRU 18 is [-226:18:-10] and [26:18:242], and the index of the pilot subcarrier included in the DRU 18 is -136 and 224.

[0490] It should be noted that the index range of the subcarriers included in each of the DRU 1 to the DRU 18 is only an example, and the index range of the subcarriers included in each of the DRU 1 to the DRU 18 can be other ranges.

[0491] Table 11-1 and Table 11-2 collectively show an example of pilot indices for an 80M bandwidth 52-tone DRU. Table 11-1 and Table 11-2 can be considered as one table. For example, each row of the table includes indices of 26 subcarriers, and the indices of the subcarriers in the nthrow of the table are the union of the indices of the subcarriers in the nthrow of Table 11-1 and the indices of the subcarriers in the nthrow of Table 11-2. n is an integer greater than 0. For another example, each row of the table includes indices of 52 subcarriers, and the indices of the subcarriers in the nthrow of the table are the union of the indices of the subcarriers included in the nthrow of Table 11-1, the indices of the subcarriers included in the nthrow of Table 11-2, the indices of the subcarriers included in the (n+16)throw of Table 11-1, and the indices of the subcarriers included in the (n+16)throw of Table 11-2. The pilot design shown in Table 11-1 and Table 11-2 satisfies Condition 1 above, which includes that the difference between indices of adjacent pilot subcarriers within a first discrete bandwidth (20M) is equal to 11, and that the subcarrier indices less than 0 and the subcarrier indices greater than 0 within the first discrete bandwidth are opposite numbers of each other. For example, the pilot design shown in Table 11-1 and Table 11-2 is designed according to Condition 1 above. In some possible implementations, the 80M Tone Plan gives a Tone Plan with a minimum of 52-tone DRU, see Table 5. In the pilot design process, the 52-tone DRU Tone Plan can be first split into a Tone Plan based on 26-tone DRU, and then the 26-tone DRU Tone Plan is combined to obtain the 52-tone DRU Tone Plan.

[0492] Table 11-1

[0493] Table 11-2

[0494] The union of the indices of the subcarriers contained in the nth row of Table 11-1 and the indices of the subcarriers contained in the nth row of Table 11-2 is the indices of the subcarriers contained in a 26-tone DRU 1. For example, the first through thirty-second rows of Table 11-1 and the first through thirty-second rows of Table 11-2 collectively show the indices of the subcarriers contained in 26-tone DRU 1 through 26-tone DRU 32, respectively. In the pilot design shown in Table 11-1 and Table 11-2, 26-tone DRU 1 through 16 and 26-tone DRU 17 through 32 are combined to form 52-tone DRUs, respectively. In practice, 26-tone DRUs do not exist. Referring to Table 11-1 and Table 11-2, the union of the indices of the subcarriers contained in the nth row of Table 11-1, the indices of the subcarriers contained in the nth row of Table 11-2, the indices of the subcarriers contained in the (n+16)th row of Table 11-1, and the indices of the subcarriers contained in the (n+16)th row of Table 11-2 is the indices of the subcarriers contained in a 52-tone DRU. In one possible implementation, a first communication device and a second communication device can store a table that is used to determine the pilot indices of 80M bandwidth 52-tone DRUs, where the nth row of the table contains the union of the indices of the subcarriers contained in the nth row of Table 11-1, the indices of the subcarriers contained in the nth row of Table 11-2, the indices of the subcarriers contained in the (n+16)th row of Table 11-1, and the indices of the subcarriers contained in the (n+16)th row of Table 11-2, i.e., the table can be formed by combining Table 11-1 and Table 11-2.

[0495] Table 11-1 and Table 11-2 collectively show the pilot indices contained in 52-tone DRU 1 through 52-tone DRU 16, respectively. For example, the union of the indices of the subcarriers contained in the first row of Table 11-1 and the first row of Table 11-2 (i.e., [-483:36:-51, 17:36:449]) and the indices of the subcarriers contained in the seventeenth row of Table 11-1 and the seventeenth row of Table 11-2 (i.e., [-467:36:-35, 33:36:465]) is the indices of the subcarriers contained in 52-tone DRU 1, which contains pilot indices -447, -359, 161, and 249. As another example, the union of the indices of the subcarriers contained in the ninth row of Table 11-1 and the ninth row of Table 11-2 (i.e., [-475:36:-43, 25:36:457]) and the indices of the subcarriers contained in the twenty-fifth row of Table 11-1 and the twenty-fifth row of Table 11-2 (i.e., [-459:36:-27, 41:36:473]) is the indices of the subcarriers contained in 52-tone DRU 2, which contains pilot indices -403, -315, 205, and 293.

[0496] Another way to describe the pilot indices for the 80M bandwidth 26-tone DRUs shown in Table 11-1 and Table 11-2 is as follows: The first discrete bandwidth (80M) includes DRU1 through DRU16, each DRU including 52 subcarriers, DRU1 through DRU16 satisfying:

[0497] DRU1 includes subcarriers with index range [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465], and includes pilot subcarriers with indices -447, -359, 161, and 249;

[0498] DRU2 includes subcarriers with index range [-475:36:-43, 25:36:457] and [-459:36:-27, 41:36:473], and includes pilot subcarriers with indices -403, -315, 205, and 293;

[0499] DRU3 includes subcarriers with index range [-479:36:-47, 21:36:453] and [-463:36:-31, 37:36:469], and includes pilot subcarriers with indices -227, -139, 73, and 381;

[0500] DRU4 includes subcarriers with index range [-471:36:-39, 29:36:461] and [-455:36:-23, 45:36:477], and includes pilot subcarriers with indices -183, -95, 117, and 425;

[0501] DRU5 includes subcarriers with index range [-477:36:-45, 23:36:455] and [-461:36:-29, 39:36:471], and includes pilot subcarriers with indices -425, -117, 95, and 183;

[0502] DRU6 includes subcarriers with index range [-469:36:-37, 31:36:463] and [-453:36:-21, 47:36:479], and includes pilot subcarriers with indices -381, -73, 139, and 227;

[0503] DRU7 includes subcarriers with index range [-481:36:-49, 19:36:451] and [-465:36:-33, 35:36:467], and includes pilot subcarriers with indices -337, -249, 271, and 359;

[0504] The index range of subcarriers contained in the DRU8 is [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475], and the index of pilot subcarriers contained in the DRU8 is -293, -205, 315 and 403;

[0505] The index range of subcarriers contained in the DRU9 is [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466], and the index of pilot subcarriers contained in the DRU9 is -194, -106, 106 and 414;

[0506] The index range of subcarriers contained in the DRU10 is [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474], and the index of pilot subcarriers contained in the DRU10 is -150, -62, 62 and 150;

[0507] The index range of subcarriers contained in the DRU11 is [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470], and the index of pilot subcarriers contained in the DRU11 is -370, -282, 238 and 326;

[0508] The index range of subcarriers contained in the DRU12 is [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478], and the index of pilot subcarriers contained in the DRU12 is -326, -238, 282 and 370;

[0509] The index range of subcarriers contained in the DRU13 is [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472], and the index of pilot subcarriers contained in the DRU13 is -260, -172, 348 and 436;

[0510] The index range of subcarriers contained in the DRU14 is [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480], and the index of pilot subcarriers contained in the DRU14 is -216, -128, 84 and 392;

[0511] The index range of the subcarriers included in the DRU 15 is [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468], and the indexes of the pilot subcarriers included in the DRU 15 are -392, -84, 128 and 216.

[0512] The index range of the subcarriers included in the DRU 16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476], and the indexes of the pilot subcarriers included in the DRU 16 are -436, -348, 172 and 260.

[0513] It should be noted that the index range of the subcarriers included in each of the DRU 1 to the DRU 16 is only an example, and the index range of the subcarriers included in each of the DRU 1 to the DRU 16 can be other ranges.

[0514] In a possible implementation, the pilot subcarriers in the subcarrier planning corresponding to the first discrete bandwidth satisfy the above condition 1, and the above condition 1 includes that the difference between the indexes of at least one group of adjacent pilot subcarriers in the first discrete bandwidth is greater than 11. The design process of the pilot subcarriers in the subcarrier planning corresponding to the first discrete bandwidth can be as follows: the first and last subcarriers in each of the subcarriers with an index less than 0 in each 26-tone DRU are not pilot subcarriers, and the first and last subcarriers in each of the subcarriers with an index greater than 0 in each 26-tone DRU are not pilot subcarriers; secondly, the indexes of part or all of the pilot subcarriers in the positive half frequency and the negative half frequency are opposite to each other, that is, part or all of the pilot subcarrier indexes in the positive half frequency can be obtained by taking the opposite of the pilot subcarrier indexes in the negative half frequency; thirdly, the distribution range of the pilot subcarriers is determined based on the above two points, for example, for a 20M bandwidth, the distribution range of the pilot subcarriers in the negative half frequency is -111- -13, and for example, for a 40M bandwidth, the distribution range of the pilot subcarriers in the negative half frequency is -224- -28, and for example, for an 80M bandwidth, the distribution range of the pilot subcarriers in the negative half frequency is -464- -36; fourthly, based on the above distribution range of the pilot subcarriers, one pilot subcarrier is configured in each 26-tone DRU in the negative half frequency, and the difference between the indexes of adjacent pilot subcarriers is ensured to be not less than 11.

[0515] As an example, the first discrete bandwidth is 20MHz, and the indexes of the pilot subcarriers in the first discrete bandwidth less than 0 and greater than 0 are opposite to each other, that is, the indexes of all the pilot subcarriers in the positive half frequency and the negative half frequency are opposite to each other. In this example, the distribution range of the pilot subcarriers in the negative half frequency can be -111- -13.

[0516] As another example, the first discrete bandwidth is 40MHz, and the indices of the pilot subcarriers within the first discrete bandwidth that are less than 0 are the negative of the indices that are greater than 0. In this example, the pilot subcarriers in the negative half of the frequency spectrum can range from -224 to -28.

[0517] As yet another example, the first discrete bandwidth is 80MHz, and the partial indices of the pilot subcarriers within the first discrete bandwidth that are less than 0 are the negative of the partial indices that are greater than 0, i.e., the indices of the partial pilot subcarriers in the positive and negative halves of the frequency spectrum are the negative of each other. In this example, the pilot subcarriers in the negative half of the frequency spectrum can range from -464 to -36.

[0518] The following tables 12, 13, 14-1, and 14-2 illustrate examples of pilot indices (or pilot subcarriers in a subcarrier plan corresponding to a first discrete bandwidth) for 26-tone DRUs in different bandwidths according to embodiments of the present application. The pilot indices for 26-tone DRUs in tables 12, 13, 14-1, and 14-2 satisfy condition 1 described above. Table 12 illustrates an example of a pilot design for another 20M tone plan according to embodiments of the present application. The pilot design illustrated in table 12 satisfies condition 1 described above, which includes that the difference between the indices of adjacent pilot subcarriers within the first discrete bandwidth (20M) is greater than or equal to 11, that the difference between the indices of at least one group of adjacent pilot subcarriers within the first discrete bandwidth is greater than 11, and that the indices of the pilot subcarriers within the first discrete bandwidth that are less than 0 are the negative of the indices that are greater than 0.

[0519] Table 12 Pilot indices for 26-tone DRUs in 20M bandwidth

[0520] Referring to table 12, the first nine rows are for the negative half of the 20M tone plan, and each of the first nine rows illustrates the indices of the subcarriers with indices less than 0 included in one of the 26-tone DRUs 1-9, e.g., the first row illustrates the indices of the subcarriers with indices less than 0 included in 26-tone DRU 1. The last nine rows (i.e., the twelfth through twentieth rows) are for the positive half of the 20M tone plan, and each of the twelfth through twentieth rows illustrates the indices of the subcarriers with indices greater than 0 included in one of the 26-tone DRUs 1-9, e.g., the twelfth row illustrates the indices of the subcarriers with indices greater than 0 included in 26-tone DRU 1. Referring to table 12, 26-tone DRU 1 (corresponding to the first and twelfth rows) includes pilot subcarriers with indices -111 and 87, and 26-tone DRU 2 (corresponding to the fifth and sixteenth rows) includes pilot subcarriers with indices -62 and 37.

[0521] Another description of the pilot indices of the 20M bandwidth 26-tone DRUs shown in Table 12 is as follows: the first discrete bandwidth (20M) includes DRU1 to DRU9, each DRU including 26 subcarriers, DRU1 to DRU9 satisfying:

[0522] DRU1 includes subcarriers with index range [-120:9:-12] and [6:9:114], and DRU1 includes pilot subcarriers with indices -111 and 87;

[0523] DRU2 includes subcarriers with index range [-116:9:-8] and [10:9:118], and DRU2 includes pilot subcarriers with indices -62 and 37;

[0524] DRU3 includes subcarriers with index range [-118:9:-10] and [8:9:116], and DRU3 includes pilot subcarriers with indices -37 and 62;

[0525] DRU4 includes subcarriers with index range [-114:9:-6] and [12:9:120], and DRU4 includes pilot subcarriers with indices -87 and 111;

[0526] DRU5 includes subcarriers with index range [-112:9:-4] and [5:9:113], and DRU5 includes pilot subcarriers with indices -13 and 50;

[0527] DRU6 includes subcarriers with index range [-119:9:-11] and [7:9:115], and DRU6 includes pilot subcarriers with indices -74 and 25;

[0528] DRU7 includes subcarriers with index range [-115:9:-7] and [11:9:119], and DRU7 includes pilot subcarriers with indices -25 and 74;

[0529] DRU8 includes subcarriers with index range [-117:9:-9] and [9:9:117], and DRU8 includes pilot subcarriers with indices -99 and 99;

[0530] DRU9 includes subcarriers with index range [-113:9:-5] and [4:9:112], and DRU9 includes pilot subcarriers with indices -50 and 13.

[0531] It should be noted that the index range of the subcarriers included in each of the above DRU1 to DRU9 is only an example, and the index range of the subcarriers included in each DRU can be other ranges.

[0532] Table 13 provides another example of pilot design for a 40M tone plan according to embodiments of the present application. Alternatively, Table 13 shows another example of pilot indices for a 40M bandwidth 26-tone DRU. The pilot design shown in Table 13 satisfies condition 1 described above, which includes that the difference between indices of adjacent pilot subcarriers within a first discrete bandwidth (20M) is greater than or equal to 11, that the difference between indices of at least one group of adjacent pilot subcarriers within the first discrete bandwidth is greater than 11, and that the indices of pilot subcarriers within the first discrete bandwidth that are less than 0 are the negative of the indices that are greater than 0.

[0533] Table 13 Pilot indices for a 40M bandwidth 26-tone DRU

[0534] Referring to Table 13, the first 18 rows are for the negative half of the 40M tone plan, each of the first through eighteenth rows shows the indices of subcarriers with indices less than 0 included in one of the 26-tone DRUs 1 through 18, for example, the first row shows the indices of subcarriers with indices less than 0 included in 26-tone DRU 1. The last 18 rows (i.e., the twenty-second through thirty-ninth rows) are for the positive half of the 40M tone plan, each of the twenty-second through thirty-ninth rows shows the indices of subcarriers with indices greater than 0 included in one of the 26-tone DRUs 1 through 18, for example, the twenty-second row shows the indices of subcarriers with indices greater than 0 included in 26-tone DRU 1. For example, 26-tone DRU 1 (corresponding to the first row and the twenty-second row) includes pilot subcarriers with indices -224 and 28, and 26-tone DRU 2 (corresponding to the tenth row and the thirty-first row) includes pilot subcarriers with indices -179 and 109.

[0535] Another way to describe the pilot indices for a 40M bandwidth 26-tone DRU shown in Table 13 is as follows: the first discrete bandwidth (40M) includes DRUs 1 through 18, each of which includes 26 subcarriers, and DRUs 1 through 18 satisfy:

[0536] DRU 1 includes subcarriers with indices in the ranges [-242:18:-26] and [10:18:226], and pilot subcarriers with indices -224 and 28;

[0537] DRU 2 includes subcarriers with indices in the ranges [-233:18:-17] and [19:18:235], and pilot subcarriers with indices -179 and 109;

[0538] The index range of the subcarriers contained in the DRU3 is [-238:18:-22] and [14:18:230], and the index of the pilot subcarriers contained in the DRU3 is -202 and 86;

[0539] The index range of the subcarriers contained in the DRU4 is [-229:18:-13] and [23:18:239], and the index of the pilot subcarriers contained in the DRU4 is -121 and 167;

[0540] The index range of the subcarriers contained in the DRU5 is [-225:18:-9] and [27:18:243], and the index of the pilot subcarriers contained in the DRU5 is -63 and 63;

[0541] The index range of the subcarriers contained in the DRU6 is [-240:18:-24] and [12:18:228], and the index of the pilot subcarriers contained in the DRU6 is -132 and 156;

[0542] The index range of the subcarriers contained in the DRU7 is [-231:18:-15] and [21:18:237], and the index of the pilot subcarriers contained in the DRU7 is -213 and 39;

[0543] The index range of the subcarriers contained in the DRU8 is [-236:18:-20] and [16:18:232], and the index of the pilot subcarriers contained in the DRU8 is -74 and 52;

[0544] The index range of the subcarriers contained in the DRU9 is [-227:18:-11] and [25:18:241], and the index of the pilot subcarriers contained in the DRU9 is -191 and 97;

[0545] The index range of the subcarriers contained in the DRU10 is [-241:18:-25] and [11:18:227], and the index of the pilot subcarriers contained in the DRU10 is -97 and 191;

[0546] The index range of the subcarriers contained in the DRU11 is [-232:18:-16] and [20:18:236], and the index of the pilot subcarriers contained in the DRU11 is -52 and 74;

[0547] The index range of the subcarriers contained in the DRU12 is [-237:18:-21] and [15:18:231], and the index of the pilot subcarriers contained in the DRU12 is -39 and 213;

[0548] The index range of the subcarriers contained in the DRU13 is [-228:18:-12] and [24:18:240], and the index of the pilot subcarriers contained in the DRU13 is -156 and 132;

[0549] The index range of the subcarriers contained in the DRU 14 is [-234:18:-18] and [18:18:234], and the indexes of the pilot subcarriers contained in the DRU 14 are -144 and 144;

[0550] The index range of the subcarriers contained in the DRU 15 is [-239:18:-23] and [13:18:229], and the indexes of the pilot subcarriers contained in the DRU 15 are -167 and 121;

[0551] The index range of the subcarriers contained in the DRU 16 is [-230:18:-14] and [22:18:238], and the indexes of the pilot subcarriers contained in the DRU 16 are -86 and 202;

[0552] The index range of the subcarriers contained in the DRU 17 is [-235:18:-19] and [17:18:233], and the indexes of the pilot subcarriers contained in the DRU 17 are -109 and 179;

[0553] The index range of the subcarriers contained in the DRU 18 is [-226:18:-10] and [26:18:242], and the indexes of the pilot subcarriers contained in the DRU 18 are -28 and 224.

[0554] It should be noted that the index range of the subcarriers contained in each of the DRU 1 to DRU 18 is only an example, and the index range of the subcarriers contained in each of the DRU 1 to DRU 18 can be other ranges.

[0555] Tables 14-1 and 14-2 collectively show an example of pilot indices for an 80M bandwidth 52-tone DRU. Tables 14-1 and 14-2 can be considered as one table. For example, each row of the table includes indices of 26 subcarriers, and the indices of the subcarriers in the nth row of the table are the union of the indices of the subcarriers in the nth row of Table 14-1 and the indices of the subcarriers in the nth row of Table 14-2. n is an integer greater than 0. For another example, each row of the table includes indices of 52 subcarriers, and the indices of the subcarriers in the nth row of the table are the union of the indices of the subcarriers included in the nth row of Table 14-1, the indices of the subcarriers included in the nth row of Table 14-2, the indices of the subcarriers included in the (n+16)th row of Table 14-1, and the indices of the subcarriers included in the (n+16)th row of Table 14-2. The pilot design shown in Tables 14-1 and 14-2 satisfies Condition 1 described above, which includes that the difference between indices of adjacent pilot subcarriers within a first discrete bandwidth (20M) is greater than or equal to 11, that the difference between indices of at least one group of adjacent pilot subcarriers within the first discrete bandwidth is greater than 11, and that the indices of the pilot subcarriers within the first discrete bandwidth that are less than 0 are the negative of the indices of the pilot subcarriers within the first discrete bandwidth that are greater than 0. For example, the pilot design shown in Tables 14-1 and 14-2 is designed according to Condition 1 described above.

[0556] Table 14-1

[0557] Table 14-2

[0558] The union of the indices of the subcarriers contained in the nth row of Table 14-1 and the indices of the subcarriers contained in the nth row of Table 14-2 is the indices of the subcarriers contained in a 26-tone DRU 1. For example, the first through thirty-second rows of Table 14-1 and the first through thirty-second rows of Table 14-2 collectively show the indices of the subcarriers contained in 26-tone DRU 1 through 26-tone DRU 32, respectively. In the pilot design shown in Table 14-1 and Table 14-2, 26-tone DRU 1 through 16 and 26-tone DRU 17 through 32 are combined to form 52-tone DRUs, respectively. In practice, 26-tone DRUs do not exist. Referring to Table 14-1 and Table 14-2, the union of the indices of the subcarriers contained in the nth row of Table 14-1, the indices of the subcarriers contained in the nth row of Table 14-2, the indices of the subcarriers contained in the (n+16)th row of Table 14-1, and the indices of the subcarriers contained in the (n+16)th row of Table 14-2 is the indices of the subcarriers contained in a 52-tone DRU. In one possible implementation, a first communication device and a second communication device can store a table for determining pilot indices for 80M bandwidth 52-tone DRUs, where the nth row of the table contains the union of the indices of the subcarriers contained in the nth row of Table 14-1, the indices of the subcarriers contained in the nth row of Table 14-2, the indices of the subcarriers contained in the (n+16)th row of Table 14-1, and the indices of the subcarriers contained in the (n+16)th row of Table 14-2, i.e., the table can be formed by combining Table 14-1 and Table 14-2.

[0559] Table 14-1 and Table 14-2 collectively show the pilot indices contained in 52-tone DRU 1 through 52-tone DRU 16, respectively. For example, the union of the indices of the subcarriers contained in the first row of Table 14-1 and the first row of Table 14-2 (i.e., [-483:36:-51, 17:36:449]) and the indices of the subcarriers contained in the seventeenth row of Table 14-1 and the seventeenth row of Table 14-2 (i.e., [-467:36:-35, 33:36:465]) is the indices of the subcarriers contained in 52-tone DRU 1, which contains pilot indices -195, -71, 269, and 393. As another example, the union of the indices of the subcarriers contained in the ninth row of Table 14-1 and the ninth row of Table 14-2 (i.e., [-475:36:-43, 25:36:457]) and the indices of the subcarriers contained in the twenty-fifth row of Table 14-1 and the twenty-fifth row of Table 14-2 (i.e., [-459:36:-27, 41:36:473]) is the indices of the subcarriers contained in 52-tone DRU 2, which contains pilot indices -331, -207, 133, and 257.

[0560] Another way to describe the pilot indices for the 80M bandwidth 26-tone DRUs shown in Table 14-1 and Table 14-2 is as follows: The first discrete bandwidth (80M) includes DRU1 through DRU16, each DRU including 52 subcarriers, DRU1 through DRU16 satisfying:

[0561] DRU1 includes subcarriers with index range [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465], and includes pilot subcarriers with indices -195, -71, 269, and 393;

[0562] DRU2 includes subcarriers with index range [-475:36:-43, 25:36:457] and [-459:36:-27, 41:36:473], and includes pilot subcarriers with indices -331, -207, 133, and 257;

[0563] DRU3 includes subcarriers with index range [-479:36:-47, 21:36:453] and [-463:36:-31, 37:36:469], and includes pilot subcarriers with indices -355, -47, 109, and 453;

[0564] DRU4 includes subcarriers with index range [-471:36:-39, 29:36:461] and [-455:36:-23, 45:36:477], and includes pilot subcarriers with indices -183, -59, 281, and 405;

[0565] DRU5 includes subcarriers with index range [-477:36:-45, 23:36:455] and [-461:36:-29, 39:36:471], and includes pilot subcarriers with indices -405, -281, 59, and 183;

[0566] DRU6 includes subcarriers with index range [-469:36:-37, 31:36:463] and [-453:36:-21, 47:36:479], and includes pilot subcarriers with indices -453, -109, 47, and 355;

[0567] DRU7 includes subcarriers with index range [-481:36:-49, 19:36:451] and [-465:36:-33, 35:36:467], and includes pilot subcarriers with indices -393, -121, 71, and 343;

[0568] The index range of subcarriers contained in the DRU8 is [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475], and the index of pilot subcarriers contained in the DRU8 is -257, -133, 207 and 331;

[0569] The index range of subcarriers contained in the DRU9 is [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466], and the index of pilot subcarriers contained in the DRU9 is -430, -158, 306 and 430;

[0570] The index range of subcarriers contained in the DRU10 is [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474], and the index of pilot subcarriers contained in the DRU10 is -294, -170, 170 and 294;

[0571] The index range of subcarriers contained in the DRU11 is [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470], and the index of pilot subcarriers contained in the DRU11 is -442, -318, 146 and 418;

[0572] The index range of subcarriers contained in the DRU12 is [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478], and the index of pilot subcarriers contained in the DRU12 is -418, -146, 318 and 442;

[0573] The index range of subcarriers contained in the DRU13 is [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472], and the index of pilot subcarriers contained in the DRU13 is -368, -244, 96 and 220;

[0574] The index range of subcarriers contained in the DRU14 is [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480], and the index of pilot subcarriers contained in the DRU14 is -380, -36, 84 and 464;

[0575] The index range of subcarriers contained in the DRU15 is [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468], and the index of pilot subcarriers contained in the DRU15 is -464, -84, 36 and 380;

[0576] The index range of the subcarriers included in the DRU 16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476], and the indexes of the pilot subcarriers included in the DRU 16 are -220, -96, 244, and 368.

[0577] It should be noted that the index range of the subcarriers included in each of the DRU1 to DRU16 is only an example, and the index range of the subcarriers included in each DRU can be other ranges.

[0578] In a possible implementation, the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth satisfy the above condition 2, and one or more of the above condition 3, the above condition 4, or the above condition 5. The descriptions of the above condition 2, the above condition 3, the above condition 4, and the above condition 5 can be referred to the foregoing description, which will not be repeated here. As an example, the design process of the pilot subcarriers in the subcarrier plan corresponding to the first discrete bandwidth is as follows: first, for the positive and negative half frequencies, the first and last subcarriers of each 26-tone DRU are not pilot subcarriers, that is, the first and last subcarriers in the subcarriers with an index greater than 0 are not pilot subcarriers, and the first and last subcarriers in the subcarriers with an index less than 0 are not pilot subcarriers; second, ensure that the relative positions of the pilot subcarriers in the positive and negative half frequencies Tone Plan are the same / adjacent; third, determine the range of the pilot distribution based on the above two points, for example, for a 20M bandwidth, the distribution range of the pilot subcarriers of the negative half frequency is -111-15, and the distribution range of the pilot subcarriers of the positive half frequency is 15-111, and for example, for a 40M bandwidth, the distribution range of the pilot subcarriers of the negative half frequency is -224-27, and the distribution range of the pilot subcarriers of the positive half frequency is 28-225, and for example, for an 80M bandwidth, the distribution range of the pilot subcarriers of the negative half frequency is -467-36, and the distribution range of the pilot subcarriers of the positive half frequency is 33-464; fourth, based on the above range, one pilot subcarrier is configured in each 26-tone DRU in the positive and negative half frequencies, and the spacing between adjacent pilot subcarriers is not less than 11.

[0579] As an example, the first discrete bandwidth is 20MHz, the distribution range of the pilot index less than 0 corresponding to the first discrete bandwidth is -111-15, and the distribution range of the pilot index greater than 0 corresponding to the first discrete bandwidth is 15-111.

[0580] As another example, the first discrete bandwidth is 40MHz, the distribution range of the pilot index less than 0 corresponding to the first discrete bandwidth is -224-27, and the distribution range of the pilot index greater than 0 corresponding to the first discrete bandwidth is 28-225.

[0581] As another example, the first discrete bandwidth is 80 MHz, the distribution range of the pilot indices corresponding to the first discrete bandwidth and smaller than 0 is -467 - 36, and the distribution range of the pilot indices corresponding to the first discrete bandwidth and larger than 0 is 33 - 464.

[0582] The following describes an example of the pilot indices (or pilot subcarriers in a subcarrier plan corresponding to the first discrete bandwidth) of the 26-tone DRU in different bandwidths provided in the present application in combination with Table 15, Table 16, Table 17-1 and Table 17-2. The pilot indices of the 26-tone DRU shown in Table 15, Table 16, Table 17-1 and Table 17-2 all satisfy condition 2, and one or more of condition 3, condition 4 or condition 5. Table 15 is an example of pilot design of another 20M tone plan provided in an embodiment of the present application.

[0583] Table 15 Pilot indices of 26-tone DRU in 20M bandwidth

[0584] Referring to Table 15, the first 9 rows are the negative half of the 20M tone plan, each of the first row to the ninth row shows the indices of the subcarriers with indices smaller than 0 included in one of the 26-tone DRU1 to 26-tone DRU9, for example, the first row shows the indices of the subcarriers with indices smaller than 0 included in the 26-tone DRU1; the last 9 rows (i.e., the twelfth row to the twentieth row) are the positive half of the 20M tone plan, each of the twelfth row to the twentieth row shows the indices of the subcarriers with indices larger than 0 included in one of the 26-tone DRU1 to 26-tone DRU9, for example, the twelfth row shows the indices of the subcarriers with indices larger than 0 included in the 26-tone DRU1. Referring to Table 15, the 26-tone DRU1 (corresponding to the first row and the twelfth row) includes pilot subcarriers with indices -111 and 15, and the 26-tone DRU2 (corresponding to the fifth row and the sixteenth row) includes pilot subcarriers with indices -26 and 100.

[0585] Another description of the pilot indices of the 26-tone DRU in 20M bandwidth shown in Table 15 is as follows: the first discrete bandwidth (20M) includes DRU1 to DRU9, each of the DRU1 to DRU9 includes 26 subcarriers, and the DRU1 to DRU9 satisfy:

[0586] The DRU1 includes subcarriers with indices in the range of [-120:9:-12] and [6:9:114], and includes pilot subcarriers with indices -111 and 15;

[0587] The index range of the subcarriers included in the DRU2 is [-116:9:-8] and [10:9:118], and the indexes of the pilot subcarriers included in the DRU2 are -26 and 100;

[0588] The index range of the subcarriers included in the DRU3 is [-118:9:-10] and [8:9:116], and the indexes of the pilot subcarriers included in the DRU3 are -100 and 26;

[0589] The index range of the subcarriers included in the DRU4 is [-114:9:-6] and [12:9:120], and the indexes of the pilot subcarriers included in the DRU4 are -15 and 111;

[0590] The index range of the subcarriers included in the DRU5 is [-112:9:-4] and [5:9:113], and the indexes of the pilot subcarriers included in the DRU5 are -76 and 50;

[0591] The index range of the subcarriers included in the DRU6 is [-119:9:-11] and [7:9:115], and the indexes of the pilot subcarriers included in the DRU6 are -38 and 88;

[0592] The index range of the subcarriers included in the DRU7 is [-115:9:-7] and [11:9:119], and the indexes of the pilot subcarriers included in the DRU7 are -88 and 38;

[0593] The index range of the subcarriers included in the DRU8 is [-117:9:-9] and [9:9:117], and the indexes of the pilot subcarriers included in the DRU8 are -63 and 63;

[0594] The index range of the subcarriers included in the DRU9 is [-113:9:-5] and [4:9:112], and the indexes of the pilot subcarriers included in the DRU9 are -50 and 76.

[0595] It should be noted that the index range of the subcarriers included in each of the DRU1 to DRU9 is only an example, and the index range of the subcarriers included in each DRU can be other ranges.

[0596] Table 16 is another example of pilot design of 40M tone plan provided by the embodiment of the present application. In other words, Table 16 shows another example of pilot index of 40M bandwidth 26-tone DRU.

[0597] Table 16 Pilot index of 40M bandwidth 26-tone DRU

[0598] Referring to Table 16, the first 18 rows are for the negative half of the 40M tone plan, each of the first 18 rows shows the indices of the subcarriers with index less than 0 contained in one of the 26-tone DRU1 to 26-tone DRU18, for example, the first row shows the indices of the subcarriers with index less than 0 contained in the 26-tone DRU1; the last 18 rows (i.e., the twenty-second row to the thirty-ninth row) are for the positive half of the 40M tone plan, each of the twenty-second row to the thirty-ninth row shows the indices of the subcarriers with index greater than 0 contained in one of the 26-tone DRU1 to 26-tone DRU18, for example, the twenty-second row shows the indices of the subcarriers with index greater than 0 contained in the 26-tone DRU1. For example, the 26-tone DRU1 (corresponding to the first row and the twenty-second row) contains the pilot subcarriers with indices -224 and 28, the 26-tone DRU2 (corresponding to the tenth row and the thirty-first row) contains the pilot subcarriers with indices -143 and 109.

[0599] Another description of the pilot indices of the 40M bandwidth 26-tone DRUs shown in Table 16 is as follows: the first discrete bandwidth (40M) includes DRU1 to DRU18, each DRU includes 26 subcarriers, and the DRU1 to DRU18 satisfy:

[0600] the DRU1 contains the subcarriers with indices in the range of [-242:18:-26] and [10:18:226], and the DRU1 contains the pilot subcarriers with indices -224 and 28;

[0601] the DRU2 contains the subcarriers with indices in the range of [-233:18:-17] and [19:18:235], and the DRU2 contains the pilot subcarriers with indices -143 and 109;

[0602] the DRU3 contains the subcarriers with indices in the range of [-238:18:-22] and [14:18:230], and the DRU3 contains the pilot subcarriers with indices -166 and 86;

[0603] the DRU4 contains the subcarriers with indices in the range of [-229:18:-13] and [23:18:239], and the DRU4 contains the pilot subcarriers with indices -85 and 167;

[0604] the DRU5 contains the subcarriers with indices in the range of [-225:18:-9] and [27:18:243], and the DRU5 contains the pilot subcarriers with indices -27 and 225;

[0605] The index range of subcarriers contained in the DRU6 is [-240:18:-24] and [12:18:228], and the indexes of pilot subcarriers contained in the DRU6 are -96 and 156;

[0606] The index range of subcarriers contained in the DRU7 is [-231:18:-15] and [21:18:237], and the indexes of pilot subcarriers contained in the DRU7 are -213 and 39;

[0607] The index range of subcarriers contained in the DRU8 is [-236:18:-20] and [16:18:232], and the indexes of pilot subcarriers contained in the DRU8 are -38 and 214;

[0608] The index range of subcarriers contained in the DRU9 is [-227:18:-11] and [25:18:241], and the indexes of pilot subcarriers contained in the DRU9 are -155 and 97;

[0609] The index range of subcarriers contained in the DRU10 is [-241:18:-25] and [11:18:227], and the indexes of pilot subcarriers contained in the DRU10 are -61 and 191;

[0610] The index range of subcarriers contained in the DRU11 is [-232:18:-16] and [20:18:236], and the indexes of pilot subcarriers contained in the DRU11 are -178 and 74;

[0611] The index range of subcarriers contained in the DRU12 is [-237:18:-21] and [15:18:231], and the indexes of pilot subcarriers contained in the DRU12 are -201 and 51;

[0612] The index range of subcarriers contained in the DRU13 is [-228:18:-12] and [24:18:240], and the indexes of pilot subcarriers contained in the DRU13 are -120 and 132;

[0613] The index range of subcarriers contained in the DRU14 is [-234:18:-18] and [18:18:234], and the indexes of pilot subcarriers contained in the DRU14 are -108 and 144;

[0614] The index range of subcarriers contained in the DRU15 is [-239:18:-23] and [13:18:229], and the indexes of pilot subcarriers contained in the DRU15 are -131 and 121;

[0615] The index range of the subcarriers included in the DRU 16 is [-230:18:-14] and [22:18:238], and the index of the pilot subcarrier included in the DRU 16 is -50 and 202.

[0616] The index range of the subcarriers included in the DRU 17 is [-235:18:-19] and [17:18:233], and the index of the pilot subcarrier included in the DRU 17 is -73 and 179.

[0617] The index range of the subcarriers included in the DRU 18 is [-226:18:-10] and [26:18:242], and the index of the pilot subcarrier included in the DRU 18 is -190 and 62.

[0618] It should be noted that the index range of the subcarriers included in each of the DRU 1 to the DRU 18 is only an example, and the index range of the subcarriers included in each of the DRU 1 to the DRU 18 can be other ranges.

[0619] Tables 17-1 and 17-2 collectively show an example of the pilot index of the 80M bandwidth 52-tone DRU. Tables 17-1 and 17-2 can be regarded as one table. For example, each row of the table includes the index of 26 subcarriers, and the index of the subcarriers in the nth row of the table is the union of the index of the subcarriers in the nth row of Table 17-1 and the index of the subcarriers in the nth row of Table 17-2. n is an integer greater than 0. For another example, each row of the table includes the index of 52 subcarriers, and the index of the subcarriers in the nth row of the table is the union of the index of the subcarriers included in the nth row of Table 17-1, the index of the subcarriers included in the nth row of Table 17-2, the index of the subcarriers included in the (n+16)th row of Table 17-1, and the index of the subcarriers included in the (n+16)th row of Table 17-2. The pilot design shown in Tables 17-1 and 17-2 satisfies the above condition 2, and one or more of the above condition 3, the above condition 4, or the above condition 5.

[0620] Table 17-1

[0621] Table 17-2

[0622] The union of the indices of the subcarriers contained in the nth row of Table 17-1 and the indices of the subcarriers contained in the nth row of Table 17-2 is the indices of the subcarriers contained in a 26-tone DRU 1. For example, the first through thirty-second rows of Table 17-1 and the first through thirty-second rows of Table 17-2 collectively show the indices of the subcarriers contained in 26-tone DRU 1 through 26-tone DRU 32, respectively. In the pilot design shown in Table 17-1 and Table 17-2, 26-tone DRU 1 through 16 and 26-tone DRU 17 through 32 are combined to form 52-tone DRUs, respectively. In practice, 26-tone DRUs do not exist. Referring to Table 17-1 and Table 17-2, the union of the indices of the subcarriers contained in the nth row of Table 17-1, the indices of the subcarriers contained in the nth row of Table 17-2, the indices of the subcarriers contained in the (n+16)th row of Table 17-1, and the indices of the subcarriers contained in the (n+16)th row of Table 17-2 is the indices of the subcarriers contained in a 52-tone DRU. In one possible implementation, a first communication device and a second communication device can store a table for determining pilot indices for 80M bandwidth 52-tone DRUs, where the nth row of the table contains the union of the indices of the subcarriers contained in the nth row of Table 17-1, the indices of the subcarriers contained in the nth row of Table 17-2, the indices of the subcarriers contained in the (n+16)th row of Table 17-1, and the indices of the subcarriers contained in the (n+16)th row of Table 17-2, i.e., the table can be formed by combining Table 17-1 and Table 17-2.

[0623] Table 17-1 and Table 17-2 collectively show the pilot indices contained in 52-tone DRU 1 through 52-tone DRU 16, respectively. For example, the union of the indices of the subcarriers contained in the first row of Table 17-1 and the first row of Table 17-2 (i.e., [-483:36:-51, 17:36:449]) and the indices of the subcarriers contained in the seventeenth row of Table 17-1 and the seventeenth row of Table 17-2 (i.e., [-467:36:-35, 33:36:465]) is the indices of the subcarriers contained in 52-tone DRU 1, which contains pilot indices -467, -159, 33, and 341. As another example, the union of the indices of the subcarriers contained in the ninth row of Table 17-1 and the ninth row of Table 17-2 (i.e., [-475:36:-43, 25:36:457]) and the indices of the subcarriers contained in the twenty-fifth row of Table 17-1 and the twenty-fifth row of Table 17-2 (i.e., [-459:36:-27, 41:36:473]) is the indices of the subcarriers contained in 52-tone DRU 2, which contains pilot indices -295, -171, 205, and 329.

[0624] Another way to describe the pilot indices of the 80M bandwidth 26-tone DRUs shown in Table 17-1 and Table 17-2 is as follows: the first discrete bandwidth (80M) includes DRU1 to DRU16, each DRU including 52 subcarriers, DRU1 to DRU16 satisfying:

[0625] DRU1 includes subcarriers with index range [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465], and includes pilot subcarriers with indices -467, -159, 33, and 341;

[0626] DRU2 includes subcarriers with index range [-475:36:-43, 25:36:457] and [-459:36:-27, 41:36:473], and includes pilot subcarriers with indices -295, -171, 205, and 329;

[0627] DRU3 includes subcarriers with index range [-479:36:-47, 21:36:453] and [-463:36:-31, 37:36:469], and includes pilot subcarriers with indices -443, -319, 57, and 181;

[0628] DRU4 includes subcarriers with index range [-471:36:-39, 29:36:461] and [-455:36:-23, 45:36:477], and includes pilot subcarriers with indices -455, -147, 45, and 353;

[0629] DRU5 includes subcarriers with index range [-477:36:-45, 23:36:455] and [-461:36:-29, 39:36:471], and includes pilot subcarriers with indices -369, -245, 131, and 255;

[0630] DRU6 includes subcarriers with index range [-469:36:-37, 31:36:463] and [-453:36:-21, 47:36:479], and includes pilot subcarriers with indices -381, -73, 119, and 427;

[0631] DRU7 includes subcarriers with index range [-481:36:-49, 19:36:451] and [-465:36:-33, 35:36:467], and includes pilot subcarriers with indices -393, -85, 107, and 415;

[0632] The index range of subcarriers contained in the DRU8 is [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475], and the index of pilot subcarriers contained in the DRU8 is -221, -97, 279 and 403;

[0633] The index range of subcarriers contained in the DRU9 is [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466], and the index of pilot subcarriers contained in the DRU9 is -430, -122, 70 and 378;

[0634] The index range of subcarriers contained in the DRU10 is [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474], and the index of pilot subcarriers contained in the DRU10 is -258, -134, 242 and 366;

[0635] The index range of subcarriers contained in the DRU11 is [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470], and the index of pilot subcarriers contained in the DRU11 is -406, -282, 94 and 218;

[0636] The index range of subcarriers contained in the DRU12 is [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478], and the index of pilot subcarriers contained in the DRU12 is -418, -110, 82 and 390;

[0637] The index range of subcarriers contained in the DRU13 is [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472], and the index of pilot subcarriers contained in the DRU13 is -332, -208, 168 and 292;

[0638] The index range of subcarriers contained in the DRU14 is [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480], and the index of pilot subcarriers contained in the DRU14 is -344, -36, 156 and 464;

[0639] The index range of the subcarriers included in the DRU 15 is [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468], and the indexes of the pilot subcarriers included in the DRU 15 are 356, -48, 144 and 452.

[0640] The index range of the subcarriers included in the DRU 16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476], and the indexes of the pilot subcarriers included in the DRU 16 are -184, -60, 316 and 440.

[0641] It should be noted that the index range of the subcarriers included in each of the DRUs 1 to 16 is only an example, and the index range of the subcarriers included in each of the DRUs can be other ranges.

[0642] The foregoing embodiments take the pilot subcarriers in the 26-tone DRU as an example to introduce the condition that the pilot subcarriers in the subcarrier planning corresponding to the first discrete bandwidth satisfy, and the pilot subcarriers of other size DRU can be obtained by merging the pilot subcarriers of the 26-tone DRU.

[0643] In a possible implementation, when the first discrete bandwidth is 20MHz or 40MHz, the pilot subcarriers in one 52-tone DRU can be obtained by merging the pilot subcarriers in two 26-tone DRUs, that is, the four pilot subcarriers in one 52-tone DRU are composed of the pilot subcarriers in the two 26-tone DRUs included in the 52-tone DRU. As an example, referring to Table 3, the pilot subcarriers in the 52-tone DRU 1 can be obtained by merging the pilot subcarriers in the 26-tone DRU 1 and the pilot subcarriers in the 26-tone DRU 2. As another example, referring to Table 3, the pilot subcarriers in the 52-tone DRU 3 can be obtained by merging the pilot subcarriers in the 26-tone DRU 5 and the pilot subcarriers in the 26-tone DRU 6. As another example, referring to Table 4, the pilot subcarriers in the 52-tone DRU 1 can be obtained by merging the pilot subcarriers in the 26-tone DRU 1 and the pilot subcarriers in the 26-tone DRU 2. As another example, referring to Table 4, the pilot subcarriers in the 52-tone DRU 2 can be obtained by merging the pilot subcarriers in the 26-tone DRU 3 and the pilot subcarriers in the 26-tone DRU 4. As another example, referring to Table 4, the pilot subcarriers in the 52-tone DRU 3 can be obtained by merging the pilot subcarriers in the 26-tone DRU 6 and the pilot subcarriers in the 26-tone DRU 7.

[0644] In a possible implementation, when the first discrete bandwidth is 20MHz or 40Mhz or 80MHz, the 4 pilot subcarriers in the 106-tone DRU are included in the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU. In a possible implementation, the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU are sorted in ascending order or in descending order, and the 1st, 3rd, 5th and 7th pilot subcarriers are selected as the pilot subcarriers in the 106-tone DRU or the 2nd, 4th, 6th and 8th pilot subcarriers are selected as the pilot subcarriers in the 106-tone DRU.

[0645] In a possible implementation, the protocol (or standard) supported by the first communication device and the second communication device specifies a manner of determining the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU, so that the first communication device and the second communication device can determine the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU in the same manner, thereby ensuring that the 4 pilot subcarriers in the 106-tone DRU determined by the first communication device and the second communication device are the same. In a possible implementation, the first communication device and the second communication device configure or instruct the manner of determining the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU. As an example, the first communication device sends a configuration information to the second communication device, and the configuration information is used by the second communication device to configure the manner of determining the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU. As another example, the first communication device sends an indication information to the second communication device, and the indication information is used to instruct the second communication device to determine the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs included in the 106-tone DRU.

[0646] One possible way to determine the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs contained in the 106-tone DRU is as follows: select the 4 pilot subcarriers of the 52-tone DRU with larger index from the 2 52-tone DRUs contained in the 106-tone DRU. Another possible way to determine the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs contained in the 106-tone DRU is as follows: select the 4 pilot subcarriers of the 52-tone DRU with smaller index from the 2 52-tone DRUs contained in the 106-tone DRU (i.e., 52-tone DRU1 and 52-tone DRU2). Another possible way to determine the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs contained in the 106-tone DRU is as follows: select the pilot subcarriers with largest pilot index and smallest pilot index from the 4 pilot subcarriers with index smaller than 0, and select the pilot subcarriers with largest pilot index and smallest pilot index from the 4 pilot subcarriers with index larger than 0. The first communication device and the second communication device can also determine the 4 pilot subcarriers in the 106-tone DRU from the 8 pilot subcarriers of the 2 52-tone DRUs contained in the 106-tone DRU in other ways, which are not limited in the present application.

[0647] In one possible implementation, when the first discrete bandwidth is 40MHz or 80MHz, the 8 pilot subcarriers of one 242-tone DRU are composed of the pilot subcarriers of the 2 106-tone DRUs contained in the 242-tone DRU. As an example, when the first discrete bandwidth is 40MHz, referring to Table 4, the 8 pilot subcarriers of the 242-tone DRU1 are composed of the 4 pilot subcarriers of the 106-tone DRU1 and the 4 pilot subcarriers of the 106-tone DRU2. As an example, when the first discrete bandwidth is 80MHz, referring to Table 5, the 8 pilot subcarriers of the 242-tone DRU1 are composed of the 4 pilot subcarriers of the 106-tone DRU1 and the 4 pilot subcarriers of the 106-tone DRU2.

[0648] In a possible implementation, when the first discrete bandwidth is 80MHz, the 16 pilot subcarriers of one 484-tone DRU are composed of the pilot subcarriers of the 2 242-tone DRUs it contains. As an example, the first discrete bandwidth is 80MHz, refer to Table 5, the 8 pilot subcarriers of the 484-tone DRU1 are composed of the 4 pilot subcarriers of the 242-tone DRU1 and the 4 pilot subcarriers of the 242-tone DRU2.

[0649] The pilot design schemes for the subcarriers shown in Table 3, Table 4 and Table 5 are described above. It should be understood that the pilot design schemes provided by the embodiments of the present application can be applied to any existing subcarrier planning or any future proposed subcarrier planning corresponding to the first discrete bandwidth, which is not limited in the present application.

[0650] FIG. 5 is a flow diagram of another communication method provided by the embodiments of the present application. The descriptions of the first communication device and the second communication device in FIG. 5 can refer to the above, which will not be described in detail here. The method flow in FIG. 5 is an example of the method described in FIG. 4. In FIG. 5, the second communication device (for example, a station) transmits OFDM symbols according to the resource allocation information in the trigger frame and the subcarrier planning corresponding to the first discrete bandwidth, which can improve the communication performance and / or reduce the storage overhead. As shown in FIG. 5, the method includes:

[0651] 501. The second communication device sends a trigger frame to the first communication device.

[0652] Correspondingly, the first communication device receives the trigger frame from the second communication device. The trigger frame is used to trigger uplink multi-user transmission. The trigger frame carries the identifier information and the resource allocation information of one or more stations (including the first communication device). The first communication device can determine the resource unit allocated to itself based on the resource allocation information.

[0653] 502. The first communication device determines the resource unit allocated to itself according to the trigger frame.

[0654] As described above, the RU or MRU allocated to the STA can be indicated by the following subfields: the resource unit allocation subfield, the primary-secondary 160 subfield (PS160 subfield), the uplink bandwidth subfield (UL BW subfield) in the common information field, and the uplink bandwidth extension subfield (UL BW extension subfield) in the special user information field. The way for the first communication device to determine the resource unit allocated to itself based on the resource allocation information will not be described here.

[0655] 503、the first communication device generates an OFDM symbol according to a subcarrier plan corresponding to the first discrete bandwidth.

[0656] 504、the first communication device transmits an uplink frame on the resource unit allocated to the first communication device by using a TB PPDU.

[0657] The second communication device receives the uplink frame from the first communication device. The uplink frame includes one or more OFDM symbols, i.e., the OFDM symbol generated in step 503. As an example, the first discrete bandwidth is 20MHz, the resource unit allocated to the first communication device includes a 26-tone DRU1, the first communication device determines the subcarriers in the 26-tone DRU1 and the pilot subcarrier according to the subcarrier plan corresponding to the first discrete bandwidth, and transmits the uplink frame on the resource unit allocated to the first communication device by using a TB PPDU. As another example, the first discrete bandwidth is 40MHz, the resource unit allocated to the first communication device includes a 52-tone DRU1, the first communication device determines the subcarriers in the 52-tone DRU1 and the pilot subcarrier according to the subcarrier plan corresponding to the first discrete bandwidth, and transmits the uplink frame on the resource unit allocated to the first communication device by using a TB PPDU.

[0658] 505、the second communication device transmits an acknowledgement frame to the first communication device.

[0659] Correspondingly, the first communication device receives the acknowledgement frame from the second communication device. For example, the first communication device receives the acknowledgement frame transmitted by the AP after a SIFS after transmitting the uplink frame.

[0660] In the embodiments of the present application, the pilot subcarrier in the subcarrier plan corresponding to the first discrete bandwidth satisfies the above condition 1 or the above condition 2, which can provide communication performance and / or reduce storage overhead.

[0661] The communication device provided by the embodiments of the present application will be described below.

[0662] The present application divides the function modules of the communication device 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 in one processing module. The 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 device of the embodiments of the present application will be described in detail below with reference to FIGS. 6-8.

[0663] Figure 6 is a structural schematic diagram of a communication apparatus provided in an embodiment of the present application. As shown in Figure 6, the communication apparatus includes a processing module 601 and a transceiver module 602. The transceiver module 602 can implement corresponding communication functions, and the processing module 601 is configured to implement corresponding processing functions. The transceiver module 602 can also be referred to as an interface, a communication interface, or a communication module, etc.

[0664] In some embodiments of the present application, the communication apparatus can be configured to perform actions performed by a first communication apparatus in the above method embodiments. The first communication apparatus can be a Wi-Fi device itself or a chip or a functional module configured in the device, etc. The transceiver module 602 is configured to perform transceiver-related operations of the first communication apparatus in the above method embodiments, and the processing module 601 is configured to perform processing-related operations of the first communication apparatus in the above method embodiments.

[0665] The processing module 601 can be configured to generate an OFDM symbol, and the transceiver module 602 can be configured to transmit or output the OFDM symbol on a first discrete bandwidth. The first discrete bandwidth corresponds to the above-mentioned subcarrier planning.

[0666] For example, the processing module 601 can include at least one of a constellation mapping module, a stream cyclic shift module, a space and frequency mapping module, an IDFT module, an insert cyclic prefix and windowing module. For example, the transceiver module 602 can include a radio frequency module, an antenna module, etc. For example, the transceiver module 602 can include a pin module, etc.

[0667] In addition to Figure 6, in another embodiment of the present application, the communication apparatus can be configured to perform actions performed by a second communication apparatus in the above method embodiments. The communication apparatus can be a Wi-Fi device itself or a chip or a functional module configured in the device, etc. The transceiver module 602 is configured to perform transceiver-related operations of the second communication apparatus in the above method embodiments, and the processing module 601 is configured to perform processing-related operations of the second communication apparatus in the above method embodiments.

[0668] The transceiver module 602 can be configured to receive or input an OFDM symbol, and the processing module 601 can be configured to parse the OFDM symbol.

[0669] For example, the processing module 601 can include at least one of a constellation mapping module, a stream cyclic shift module, a space and frequency mapping module, an IDFT module, an insert cyclic prefix and windowing module. For example, the transceiver module 602 can include a radio frequency module, an antenna module, etc. For example, the transceiver module 602 can include a pin module, etc.

[0670] Optionally, in each of the above embodiments, the communication apparatus can further include a storage module, which can be configured to store instructions and / or data, and the processing module 601 can read the instructions and / or data in the storage module to enable the communication apparatus to implement the foregoing method embodiments. For example, the storage module can store the subcarrier planning and the like shown above.

[0671] In each of the above embodiments, the specific description of each term or name or step can refer to the description in the method embodiments above, and will not be repeated here.

[0672] The specific description of the transceiver module and the processing module shown in each of the above embodiments is only an example. For the specific functions or executed steps of the transceiver module and the processing module, refer to the method embodiments above, and will not be described here.

[0673] The communication apparatus of the embodiments of the present application is introduced above. The possible product forms of the communication apparatus are introduced below. Any product form having the functions of the communication apparatus shown in FIG. 6 falls within the protection scope of the embodiments of the present application. The following introduction is only an example, and does not limit the product form of the communication apparatus of the embodiments of the present application.

[0674] In a possible implementation, in the communication apparatus shown in FIG. 6, the processing module 601 can be one or more processors, and the transceiver module 602 can be a transceiver, or the transceiver module 602 can also be a sending module and a receiving module, the sending module can be a transmitter, and the receiving module can be a receiver, which are integrated in one device, such as a transceiver. In the embodiments of the present application, the processor and the transceiver can be coupled, and the connection manner of the processor and the transceiver is not limited in the embodiments of the present application. In the process of executing the above method, the process of sending information in the above method can be the process of outputting the above information by the processor. When outputting the above information, the processor outputs the above information to the transceiver for transmission by the transceiver. The above information can need to be processed further after being output by the processor, and then reaches the transceiver. Similarly, the process of receiving information in the above method can be the process of receiving inputted above information by the processor. When the processor receives the inputted information, the transceiver receives the above information and inputs it to the processor. Further, after the transceiver receives the above information, the above information can need to be processed further, and then input to the processor.

[0675] As shown in FIG. 7, the communication apparatus 70 includes one or more processors 720 and a transceiver 710.

[0676] In some embodiments of the present application, the communication device can be configured to perform the steps or methods or functions performed by the first communication device as described above, e.g., the processor 720 can be configured to perform the functions or steps implemented by the processing module 601 as shown in FIG. 6, and the transceiver 710 can be configured to perform the functions or steps implemented by the transceiving module 602 as shown in FIG. 6. For details about the processor 720 and the transceiver 710, reference can be made to FIG. 6 or the method embodiments described above, which will not be repeated here.

[0677] In some embodiments of the present application, the communication device can be configured to perform the steps or methods or functions performed by the first communication device as described above, e.g., the processor 720 can be configured to perform the functions or steps implemented by the processing module 601 as shown in FIG. 6, and the transceiver 710 can be configured to perform the functions or steps implemented by the transceiving module 602 as shown in FIG. 6. For details about the processor 720 and the transceiver 710, reference can be made to FIG. 6 or the method embodiments described above, which will not be repeated here.

[0678] In each implementation of the communication device shown in FIG. 7, 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. The transceiver is configured to communicate with other devices / apparatuses via a transmission medium.

[0679] Optionally, the communication device 70 can further include one or more memories 730 configured to store program instructions and / or data. The memory 730 is coupled to the processor 720. The coupling between the communication device, unit or module in the embodiments of the present application is indirect coupling or communication connection between the communication device, unit or module, which can be electrical, mechanical or other forms, for information interaction between the communication device, unit or module. The processor 720 can operate in cooperation with the memory 730. The processor 720 can execute the program instructions stored in the memory 730. Optionally, at least one of the one or more memories can be included in the processor.

[0680] The specific connection medium between the transceiver 710, the processor 720 and the memory 730 in the embodiments of the present application is not limited. In FIG. 7, the memory 730, the processor 720 and the transceiver 710 are connected by a bus 740, which is represented by a thick line in FIG. 7, and the connection mode between other components is only schematic and is not limited. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, only one thick line is shown in FIG. 7, but it does not mean that there is only one bus or only one type of bus.

[0681] 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.

[0682] 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.

[0683] The processor 720 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 730 is mainly used for storing software programs and data. The transceiver 710 can include a control circuit and an antenna, and the control circuit is mainly used for conversion between baseband signals and radio frequency signals and processing of 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 data input by a user and outputting data to the user.

[0684] When the communication apparatus is powered on, the processor 720 can read a software program in the memory 730, interpret and execute instructions of the software program, and process data of the software program. When data needs to be transmitted wirelessly, the processor 720 performs baseband processing on the data to be transmitted, and outputs a baseband signal to the radio frequency circuit. The radio frequency circuit performs radio frequency processing on the baseband signal, and transmits a radio frequency signal in the form of an electromagnetic wave through an 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 720. The processor 720 converts the baseband signal into data and processes the data.

[0685] 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.

[0686] The communication apparatus shown in the embodiments of the present application can also have more components than those shown in FIG. 7, and the embodiments of the present application do not limit this. 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 described above.

[0687] In another possible implementation, in the communication apparatus shown in FIG. 6, the processing module 601 can be one or more logic circuits, and the transceiving module 602 can be an input / output interface, also referred to as a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiving module 602 can also be a sending module and a receiving module. The sending module can be an output interface, and the receiving module can be an input interface. The sending module and the receiving module are integrated in one module, for example, an input / output interface. As shown in FIG. 8, the communication apparatus shown in FIG. 8 includes a logic circuit 801 and an interface 802. That is, the processing module 601 can be implemented by the logic circuit 801, and the transceiving module 602 can be implemented by the interface 802. The logic circuit 801 can be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, etc., and the interface 802 can be a communication interface, an input / output interface, a pin, etc. For example, FIG. 8 is a chip in which the above communication apparatus is taken as an example, and the chip includes the logic circuit 801 and the interface 802.

[0688] In the embodiments of the present application, the logic circuit and the interface can also be coupled with each other. The specific connection mode of the logic circuit and the interface is not limited in the embodiments of the present application. For example, the logic circuit 801 can be used to execute the functions or steps implemented by the processing module 601 shown in FIG. 6, and the interface 802 can be used to execute the functions or steps implemented by the transceiver module 602 shown in FIG. 6. The specific description of the logic circuit 801 and the interface 802 can refer to the method embodiments shown in FIG. 6 or the above description, and will not be described in detail here.

[0689] 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, etc., and the embodiments of the present application do not limit this.

[0690] In addition, the embodiments of the present application also provide a communication system, which includes a first communication apparatus and a second communication apparatus, and the first communication apparatus and the second communication apparatus can be used to execute the method in any of the above embodiments.

[0691] The present application also provides a computer program for implementing the operations and / or processes performed by each communication apparatus in the method provided by the present application.

[0692] The present application also provides a computer readable storage medium, which stores computer code, when the computer code is run on a computer, the computer code causes the computer to execute the operations and / or processes performed by each communication apparatus in the method provided by the present application.

[0693] The present application also provides a computer program product, which includes computer code or computer program, when the computer code or computer program is run on a computer, the operations and / or processes performed by each communication apparatus in the method provided by the present application are executed.

[0694] In the several embodiments of the present application, it should be understood that the disclosed system, communication apparatus and method can be implemented by other ways. For example, the above-described communication apparatus embodiments are only schematic, and the division of the modules is only a logical function division, and there can be another division way in actual implementation, for example, a plurality of modules or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the modules shown or discussed can be indirect coupling or communication connection through some interfaces, communication devices or modules, and can also be electrical, mechanical or other forms of connection.

[0695] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple network modules. Some or all of the modules can be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of this application.

[0696] Furthermore, the functional modules in the various embodiments of this application can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0697] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a readable storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned readable storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0698] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

A communication method characterized by comprising: The method comprises: sending or receiving an OFDM symbol according to a subcarrier plan corresponding to a first discrete bandwidth; pilot subcarriers in the subcarrier plan satisfy the following conditions: each distributed resource unit (DRU) comprises subcarriers with an index greater than 0 and subcarriers with an index less than 0, the first and last subcarriers with an index greater than 0 are not pilot subcarriers, and the first and last subcarriers with an index less than 0 are not pilot subcarriers; the difference between the indices of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11; or the indices less than 0 of the pilot subcarriers in the first discrete bandwidth and the indices greater than 0 of the pilot subcarriers in the first discrete bandwidth are opposite numbers of each other, or each index less than 0 of the pilot subcarriers in the first discrete bandwidth and each index greater than 0 of the pilot subcarriers in the first discrete bandwidth are opposite numbers of each other. The method of claim 1, wherein The first discrete bandwidth is 20 MHz, the minimum index of the subcarriers in the DRU contained in the first discrete bandwidth is -120, and the maximum index is 120; or the first discrete bandwidth is 40 MHz, the minimum index of the subcarriers in the DRU contained in the first discrete bandwidth is -244, and the maximum index is 244; or the first discrete bandwidth is 80 MHz, the minimum index of the subcarriers in the DRU contained in the first discrete bandwidth is -499, and the maximum index is 500. The method according to claim 2, characterized in that The first discrete bandwidth is 20 MHz, and the first discrete bandwidth contains DRUs with a subcarrier index range of [-120:9:-12, 6:9:114]; the first discrete bandwidth is 40 MHz, and the first discrete bandwidth contains DRUs with a subcarrier index range of [-242:18:-26, 10:18:226]; and the first discrete bandwidth is 80 MHz, and the first discrete bandwidth contains DRUs with a subcarrier index range of [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465]. The method according to any one of claims 1 to 3, characterized in that The difference between the indices of adjacent pilot subcarriers in the first discrete bandwidth is equal to 11. The first discrete bandwidth comprises a plurality of first DRUs, each first DRU comprising 26 subcarriers, and the absolute value of the difference between the indices of two pilot subcarriers contained in each first DRU is a first value. Alternatively, the first discrete bandwidth comprises a plurality of second DRUs, each second DRU comprising 52 subcarriers, and each second DRU comprises two groups of pilot subcarriers with an absolute value of the difference between the indices of 52, each group comprising two pilot subcarriers. The method according to claim 4, characterized in that The first discrete bandwidth is 20 MHz, and the first value is 126. Alternatively, the first discrete bandwidth is 40 MHz, and the first value is 252. Alternatively, the first discrete bandwidth is 80 MHz, and the second value is 500. The method according to any one of claims 1 to 5, characterized in that The absolute difference between the indices of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11. The first discrete bandwidth comprises a plurality of first DRUs, each first DRU containing 26 subcarriers, each first DRU containing two pilot subcarriers, and a difference between relative indexes of the two pilot subcarriers contained by each first DRU is 13 or 14. Alternatively, the first discrete bandwidth comprises a plurality of second DRUs, each second DRU containing 52 subcarriers, each second DRU containing two pilot subcarriers with a difference between relative indexes of 13 or 14, and each second DRU containing two groups of pilot subcarriers. The method according to any one of claims 1 to 6, characterized in that The first discrete bandwidth comprises a plurality of first DRUs, each first DRU containing 26 subcarriers, each first DRU containing two pilot subcarriers, and indexes of the two pilot subcarriers in each first DRU correspond to same or different ordering values by 1, an ordering value corresponding to an index of a first pilot subcarrier in each first DRU is an ordering value of the index of the first pilot subcarrier among indexes of subcarriers contained by the first DRU and having a value greater than 0, and an ordering value corresponding to an index of a second pilot subcarrier in each first DRU is an ordering value of the index of the second pilot subcarrier among indexes of subcarriers contained by the first DRU and having a value less than 0. The method according to any one of claims 1 to 7, characterized in that The first discrete bandwidth comprises DRU1 to DRU9, and the DRU1 to the DRU9 satisfy one or more of the following: The DRU1 contains pilot subcarriers with indexes of -30 and 96; The DRU2 contains pilot subcarriers with indexes of -107 and 19; The DRU3 contains pilot subcarriers with indexes of -19 and 107; The DRU4 contains pilot subcarriers with indexes of -96 and 30; The DRU5 contains pilot subcarriers with indexes of -85 and 41; The DRU6 contains pilot subcarriers with indexes of -74 and 52; The DRU7 contains pilot subcarriers with indexes of -52 and 74; The DRU8 contains pilot subcarriers with indexes of -63 and 63; The DRU9 contains pilot subcarriers with indexes of -41 and 85. The method according to any one of claims 1 to 7, characterized in that The first discrete bandwidth comprises DRU1 to DRU18, and the DRU1 to the DRU18 satisfy one or more of the following: The DRU1 contains pilot subcarriers with indexes of -170 and 82; The DRU2 contains pilot subcarriers with indexes of -71 and 181; The DRU3 contains pilot subcarriers with indexes of -148 and 104; The DRU4 contains pilot subcarriers with indexes of -49 and 203; The DRU5 contains pilot subcarriers with indexes of -27 and 225; The DRU6 contains pilot subcarriers with indexes of -60 and 192; The DRU7 contains pilot subcarriers with indexes of -159 and 93; The DRU8 contains pilot subcarriers with indexes of -38 and 214; The DRU9 contains pilot subcarriers with indexes of -137 and 115; The DRU10 contains pilot subcarriers with indexes of -115 and 137; The DRU11 contains pilot subcarriers with indexes of -214 and 38; The DRU12 contains pilot subcarriers with indexes of -93 and 159; The DRU 13 comprises pilot subcarriers with indexes -192 and 60; The DRU 14 comprises pilot subcarriers with indexes -126 and 126; The DRU 15 comprises pilot subcarriers with indexes -203 and 49; The DRU 16 comprises pilot subcarriers with indexes -104 and 148; The DRU 17 comprises pilot subcarriers with indexes -181 and 71; The DRU 18 comprises pilot subcarriers with indexes -82 and 170. The method according to any one of claims 1 to 7, characterized in that The first discrete bandwidth comprises DRUs 1 to 16, which satisfy one or more of the following: The DRU 1 comprises pilot subcarriers with indexes -195, -107, 305 and 393; The DRU 2 comprises pilot subcarriers with indexes -151, -63, 349 and 437; The DRU 3 comprises pilot subcarriers with indexes -371, -283, 129 and 217; The DRU 4 comprises pilot subcarriers with indexes -327, -239, 173 and 261; The DRU 5 comprises pilot subcarriers with indexes -261, -173, 239 and 327; The DRU 6 comprises pilot subcarriers with indexes -217, -129, 283 and 371; The DRU 7 comprises pilot subcarriers with indexes -393, -85, 107 and 415; The DRU 8 comprises pilot subcarriers with indexes -437, -349, 63 and 151; The DRU 9 comprises pilot subcarriers with indexes -338, -250, 162 and 250; The DRU 10 comprises pilot subcarriers with indexes -294, -206, 206 and 294; The DRU 11 comprises pilot subcarriers with indexes -426, -118, 74 and 382; The DRU 12 comprises pilot subcarriers with indexes -382, -74, 118 and 426; The DRU 13 comprises pilot subcarriers with indexes -404, -316, 96 and 184; The DRU 14 comprises pilot subcarriers with indexes -360, -272, 140 and 228; The DRU 15 comprises pilot subcarriers with indexes -228, -140, 272 and 360; The DRU 16 comprises pilot subcarriers with indexes -184, -96, 316 and 404. The method according to any one of claims 1 to 3, characterized in that The difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is 11; The first discrete bandwidth is 20MHz or 40MHz, and each index smaller than 0 of the pilot subcarriers in the first discrete bandwidth is the opposite of each index larger than 0; Alternatively, the first discrete bandwidth is 80MHz, and each index smaller than 0 of the pilot subcarriers in the first discrete bandwidth is the opposite of each index larger than 0. The method according to claims 1, 2, 3, 11, characterized in that, The first discrete bandwidth comprises DRUs 1 to 9, which satisfy one or more of the following: The DRU 1 comprises pilot subcarriers with indexes -111 and 78; The DRU 2 comprises pilot subcarriers with indexes -89 and 100; DRU3 includes pilot subcarriers with indices -100 and 89; DRU4 includes pilot subcarriers with indices -78 and 111; DRU5 includes pilot subcarriers with indices -67 and 23; DRU6 includes pilot subcarriers with indices -56 and 34; DRU7 includes pilot subcarriers with indices -34 and 56; DRU8 includes pilot subcarriers with indices -45 and 45; DRU9 includes pilot subcarriers with indices -23 and 67. The method according to claims 1, 2, 3, 11, characterized in that, The first discrete bandwidth includes DRU1 to DRU18, which satisfy one or more of the following: DRU1 includes pilot subcarriers with indices -224 and 136; DRU2 includes pilot subcarriers with indices -125 and 37; DRU3 includes pilot subcarriers with indices -202 and 158; DRU4 includes pilot subcarriers with indices -103 and 59; DRU5 includes pilot subcarriers with indices -81 and 81; DRU6 includes pilot subcarriers with indices -114 and 48; DRU7 includes pilot subcarriers with indices -213 and 147; DRU8 includes pilot subcarriers with indices -92 and 70; DRU9 includes pilot subcarriers with indices -191 and 169; DRU10 includes pilot subcarriers with indices -169 and 191; DRU11 includes pilot subcarriers with indices -70 and 92; DRU12 includes pilot subcarriers with indices -147 and 213; DRU13 includes pilot subcarriers with indices -48 and 114; DRU14 includes pilot subcarriers with indices -180 and 180; DRU15 includes pilot subcarriers with indices -59 and 103; DRU16 includes pilot subcarriers with indices -158 and 202; DRU17 includes pilot subcarriers with indices -37 and 125; DRU18 includes pilot subcarriers with indices -136 and 224. The method according to claims 1, 2, 3, 11, characterized in that, The first discrete bandwidth includes DRU1 to DRU16, which satisfy one or more of the following: DRU1 includes pilot subcarriers with indices -447, -359, 161, and 249; DRU2 includes pilot subcarriers with indices -403, -315, 205, and 293; DRU3 includes pilot subcarriers with indices -227, -139, 73, and 381; DRU4 includes pilot subcarriers with indices -183, -95, 117, and 425; DRU5 includes pilot subcarriers with indices -425, -117, 95, and 183; DRU6 includes pilot subcarriers with indices -381, -73, 139, and 227; DRU7 includes pilot subcarriers with indices -337, -249, 271, and 359; DRU8 includes pilot subcarriers with indices -293, -205, 315, and 403; The DRU 9 comprises pilot subcarriers with indexes of -194, -106, 106 and 414; The DRU 10 comprises pilot subcarriers with indexes of -150, -62, 62 and 150; The DRU 11 comprises pilot subcarriers with indexes of -370, -282, 238 and 326; The DRU 12 comprises pilot subcarriers with indexes of -326, -238, 282 and 370; The DRU 13 comprises pilot subcarriers with indexes of -260, -172, 348 and 436; The DRU 14 comprises pilot subcarriers with indexes of -216, -128, 84 and 392; The DRU 15 comprises pilot subcarriers with indexes of -392, -84, 128 and 216; The DRU 16 comprises pilot subcarriers with indexes of -436, -348, 172 and 260. The method according to any one of claims 1 to 3, characterized in that The difference between the indexes of at least one group of adjacent pilot subcarriers in the first discrete bandwidth is greater than 11; The first discrete bandwidth is 20MHz or 40MHz, and each index smaller than 0 of the pilot subcarriers in the first discrete bandwidth is the opposite of each index greater than 0; Alternatively, the first discrete bandwidth is 80MHz, and part of the indexes smaller than 0 of the pilot subcarriers in the first discrete bandwidth is the opposite of part of the indexes greater than 0. The method according to claims 1, 2, 3 and 15, characterized in that The first discrete bandwidth is 20MHz, and the indexes of the pilot subcarriers in the first discrete bandwidth with indexes smaller than 0 are distributed in the range of -111 to -13; Alternatively, the first discrete bandwidth is 40MHz, and the indexes of the pilot subcarriers in the first discrete bandwidth with indexes smaller than 0 are distributed in the range of -224 to -28; Alternatively, the first discrete bandwidth is 80MHz, and the indexes of the pilot subcarriers in the first discrete bandwidth with indexes smaller than 0 are distributed in the range of -464 to -36. The method according to claims 1, 2, 3, 15 and 16, characterized in that The first discrete bandwidth comprises DRU1 to DRU9, and the DRU1 to the DRU9 satisfy one or more of the following: The DRU 1 comprises pilot subcarriers with indexes of -111 and 87; The DRU 2 comprises pilot subcarriers with indexes of -62 and 37; The DRU 3 comprises pilot subcarriers with indexes of -37 and 62; The DRU 4 comprises pilot subcarriers with indexes of -87 and 111; The DRU 5 comprises pilot subcarriers with indexes of -13 and 50; The DRU 6 comprises pilot subcarriers with indexes of -74 and 25; The DRU 7 comprises pilot subcarriers with indexes of -25 and 74; The DRU 8 comprises pilot subcarriers with indexes of -99 and 99; The DRU 9 comprises pilot subcarriers with indexes of -50 and 13. The method according to claims 1, 2, 3, 15 and 16, characterized in that The first discrete bandwidth comprises DRU1 to DRU18, and the DRU1 to the DRU18 satisfy one or more of the following: The DRU 1 comprises pilot subcarriers with indexes of -224 and 28; The DRU 2 comprises pilot subcarriers with indexes of -179 and 109; The DRU 3 comprises pilot subcarriers with indexes of -202 and 86; The DRU 4 comprises pilot subcarriers with indexes of -121 and 167; The DRU 5 includes pilot subcarriers with indices -63 and 63; The DRU 6 includes pilot subcarriers with indices -132 and 156; The DRU 7 includes pilot subcarriers with indices -213 and 39; The DRU 8 includes pilot subcarriers with indices -74 and 52; The DRU 9 includes pilot subcarriers with indices -191 and 97; The DRU 10 includes pilot subcarriers with indices -97 and 191; The DRU 11 includes pilot subcarriers with indices -52 and 74; The DRU 12 includes pilot subcarriers with indices -39 and 213; The DRU 13 includes pilot subcarriers with indices -156 and 132; The DRU 14 includes pilot subcarriers with indices -144 and 144; The DRU 15 includes pilot subcarriers with indices -167 and 121; The DRU 16 includes pilot subcarriers with indices -86 and 202; The DRU 17 includes pilot subcarriers with indices -109 and 179; The DRU 18 includes pilot subcarriers with indices -28 and 224. The method according to claims 1, 2, 3, 15 and 16, characterized in that The first discrete bandwidth includes DRUs 1-16, which satisfy one or more of the following: The DRU 1 includes pilot subcarriers with indices -195, -71, 269, and 393; The DRU 2 includes pilot subcarriers with indices -331, -207, 133, and 257; The DRU 3 includes pilot subcarriers with indices -355, -47, 109, and 453; The DRU 4 includes pilot subcarriers with indices -183, -59, 281, and 405; The DRU 5 includes pilot subcarriers with indices -405, -281, 59, and 183; The DRU 6 includes pilot subcarriers with indices -453, -109, 47, and 355; The DRU 7 includes pilot subcarriers with indices -393, -121, 71, and 343; The DRU 8 includes pilot subcarriers with indices -257, -133, 207, and 331; The DRU 9 includes pilot subcarriers with indices -430, -158, 306, and 430; The DRU 10 includes pilot subcarriers with indices -294, -170, 170, and 294; The DRU 11 includes pilot subcarriers with indices -442, -318, 146, and 418; The DRU 12 includes pilot subcarriers with indices -418, -146, 318, and 442; The DRU 13 includes pilot subcarriers with indices -368, -244, 96, and 220; The DRU 14 includes pilot subcarriers with indices -380, -36, 84, and 464; The DRU 15 includes pilot subcarriers with indices -464, -84, 36, and 380; The DRU 16 includes pilot subcarriers with indices -220, -96, 244, and 368. The method according to claims 8, 12 and 17, characterized in that The DRU 1 includes subcarriers with indices in the range [-120:9:-12] and [6:9:114]; DRU2 comprises subcarriers with index ranging from [-116:9:-8] and [10:9:118]; DRU3 comprises subcarriers with index ranging from [-118:9:-10] and [8:9:116]; DRU4 comprises subcarriers with index ranging from [-114:9:-6] and [12:9:120]; DRU5 comprises subcarriers with index ranging from [-112:9:-4] and [5:9:113]; DRU6 comprises subcarriers with index ranging from [-119:9:-11] and [7:9:115]; DRU7 comprises subcarriers with index ranging from [-115:9:-7] and [11:9:119]; DRU8 comprises subcarriers with index ranging from [-117:9:-9] and [9:9:117]; DRU9 comprises subcarriers with index ranging from [-113:9:-5] and [4:9:112]. The method according to claims 9, 13 and 18, characterized in that DRU1 comprises subcarriers with index ranging from [-242:18:-26] and [10:18:226]; DRU2 comprises subcarriers with index ranging from [-233:18:-17] and [19:18:235]; DRU3 comprises subcarriers with index ranging from [-238:18:-22] and [14:18:230]; DRU4 comprises subcarriers with index ranging from [-229:18:-13] and [23:18:239]; DRU5 comprises subcarriers with index ranging from [-225:18:-9] and [27:18:243]; DRU6 comprises subcarriers with index ranging from [-240:18:-24] and [12:18:228]; DRU7 comprises subcarriers with index ranging from [-231:18:-15] and [21:18:237]; DRU8 comprises subcarriers with index ranging from [-236:18:-20] and [16:18:232]; DRU9 comprises subcarriers with index ranging from [-227:18:-11] and [25:18:241]; DRU10 comprises subcarriers with index ranging from [-241:18:-25] and [11:18:227]; DRU11 comprises subcarriers with index ranging from [-232:18:-16] and [20:18:236]; DRU12 comprises subcarriers with index ranging from [-237:18:-21] and [15:18:231]; DRU13 comprises subcarriers with index ranging from [-228:18:-12] and [24:18:240]; DRU14 comprises subcarriers with index ranging from [-234:18:-18] and [18:18:234]; DRU15 comprises subcarriers with index ranging from [-239:18:-23] and [13:18:229]; DRU16 comprises subcarriers with index ranging from [-230:18:-14] and [22:18:238]; The DRU 17 contains subcarriers with index ranging from [-235:18:-19] and [17:18:233]; The DRU 18 contains subcarriers with index ranging from [-226:18:-10] and [26:18:242]. The method according to claims 10, 14 and 19, characterized in that The DRU 1 contains subcarriers with index ranging from [-483:36:-51, 17:36:449] and [-467:36:-35, 33:36:465]; The DRU 2 contains subcarriers with index ranging from [-475:36:-43, 25:36:457] and [-459:36:-27, 41:36:473]; The DRU 3 contains subcarriers with index ranging from [-479:36:-47, 21:36:453] and [-463:36:-31, 37:36:469]; The DRU 4 contains subcarriers with index ranging from [-471:36:-39, 29:36:461] and [-455:36:-23, 45:36:477]; The DRU 5 contains subcarriers with index ranging from [-477:36:-45, 23:36:455] and [-461:36:-29, 39:36:471]; The DRU 6 contains subcarriers with index ranging from [-469:36:-37, 31:36:463] and [-453:36:-21, 47:36:479]; The DRU 7 contains subcarriers with index ranging from [-481:36:-49, 19:36:451] and [-465:36:-33, 35:36:467]; The DRU 8 contains subcarriers with index ranging from [-473:36:-41, 27:36:459] and [-457:36:-25, 43:36:475]; The DRU 9 contains subcarriers with index ranging from [-482:36:-50, 18:36:450] and [-466:36:-34, 34:36:466]; The DRU 10 contains subcarriers with index ranging from [-474:36:-42, 26:36:458] and [-458:36:-26, 42:36:474]; The DRU 11 contains subcarriers with index ranging from [-478:36:-46, 22:36:454] and [-462:36:-30, 38:36:470]; The DRU 12 contains subcarriers with index ranging from [-470:38:-38, 30:36:462] and [-454:36:-22, 46:36:478]; The DRU 13 contains subcarriers with index ranging from [-476:36:-44, 24:36:456] and [-460:36:-28, 40:36:472]; The DRU 14 contains subcarriers with index ranging from [-468:36:-36, 32:36:464] and [-452:36:-20, 48:36:480]; The index range of the subcarriers included in the DRU 15 is [-480:36:-48, 20:36:452] and [-464:36:-32, 36:36:468]; The index range of the subcarriers included in the DRU 16 is [-472:36:-40, 28:36:460] and [-456:36:-24, 44:36:476]. A communication method characterized by comprising: Comprise: According to the subcarrier planning corresponding to the first discrete bandwidth, transmitting or receiving an orthogonal frequency division multiplexing OFDM symbol; The pilot subcarriers in the subcarrier planning satisfy the following conditions: each distributed resource unit DRU includes subcarriers with an index greater than 0 and subcarriers with an index less than 0, the first and last subcarriers in the subcarriers with an index greater than 0 are not pilot subcarriers, and the first and last subcarriers in the subcarriers with an index less than 0 are not pilot subcarriers; the difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11; the difference between the maximum and minimum values in the indexes of a plurality of pilot subcarriers in the first discrete bandwidth is greater than 11*n, n is equal to the number of the plurality of pilot subcarriers minus 1. The method of claim 23, wherein The first discrete bandwidth includes a plurality of first DRUs, each first DRU includes 26 subcarriers, and the absolute value of the difference between the indexes of two pilot subcarriers included in each first DRU is a first value; Or, the first discrete bandwidth includes a plurality of second DRUs, each second DRU includes 52 subcarriers, and each second DRU includes two groups of pilot subcarriers with an absolute value of the difference between the indexes of 13 or 14, each group including two pilot subcarriers. The method of claim 24, wherein The first discrete bandwidth is 20MHz, and the first value is 126; Or, the first discrete bandwidth is 40MHz, and the first value is 252; Or, the first discrete bandwidth is 80MHz, and the second value is 500. The method according to any one of claims 23 to 25, characterized in that The absolute difference between the indexes of adjacent pilot subcarriers in the first discrete bandwidth is greater than or equal to 11; The first discrete bandwidth includes a plurality of first DRUs, each first DRU includes 26 subcarriers, and each first DRU includes two pilot subcarriers, and the relative difference between the indexes of the two pilot subcarriers included in each DRU is 13 or 14; Or, the first discrete bandwidth includes a plurality of second DRUs, each second DRU includes 52 subcarriers, and each second DRU includes two groups of pilot subcarriers with a relative difference between the indexes of 13 or 14, each group including two pilot subcarriers. The method according to any one of claims 23 to 26, characterized in that The first discrete bandwidth comprises a plurality of first DRUs, each first DRU containing 26 subcarriers, each first DRU containing two pilot subcarriers, the index of the two pilot subcarriers in each first DRU corresponding to the same or a difference of 1 in the ordering value, the index of the first pilot subcarrier in each first DRU corresponding to the ordering value of the index of the first pilot subcarrier in the index of each subcarrier contained in the first DRU being greater than 0, the index of the second pilot subcarrier in each first DRU corresponding to the ordering value of the index of the second pilot subcarrier in the index of each subcarrier contained in the first DRU being less than 0. The method according to any one of claims 23 to 27, characterized in that The first discrete bandwidth is 20MHz, the distribution range of the pilot index corresponding to less than 0 in the first discrete bandwidth is -111-15, and the distribution range of the pilot index corresponding to greater than 0 in the first discrete bandwidth is 15-111. Alternatively, the first discrete bandwidth is 40MHz, the distribution range of the pilot index corresponding to less than 0 in the first discrete bandwidth is -224-27, and the distribution range of the pilot index corresponding to greater than 0 in the first discrete bandwidth is 28-225. Alternatively, the first discrete bandwidth is 80MHz, the distribution range of the pilot index corresponding to less than 0 in the first discrete bandwidth is -467-36, and the distribution range of the pilot index corresponding to greater than 0 in the first discrete bandwidth is 33-464. The method according to any one of claims 23 to 28, characterized in that The first discrete bandwidth comprises DRU1-DRU9; the DRU1-DRU9 satisfy one or more of the following: The index of the pilot subcarrier contained in the DRU1 is -111 and 15; The index of the pilot subcarrier contained in the DRU2 is -26 and 100; The index of the pilot subcarrier contained in the DRU3 is -100 and 26; The index of the pilot subcarrier contained in the DRU4 is -15 and 111; The index of the pilot subcarrier contained in the DRU5 is -76 and 50; The index of the pilot subcarrier contained in the DRU6 is -38 and 88; The index of the pilot subcarrier contained in the DRU7 is -88 and 38; The index of the pilot subcarrier contained in the DRU8 is -63 and 63; The index of the pilot subcarrier contained in the DRU9 is -50 and 76. The method according to any one of claims 23 to 28, characterized in that The first discrete bandwidth comprises DRU1-DRU18; the DRU1-DRU18 satisfy one or more of the following The index of the pilot subcarrier contained in the DRU1 is -224 and 28; The index of the pilot subcarrier contained in the DRU2 is -143 and 109; The index of the pilot subcarrier contained in the DRU3 is -166 and 86; The index of the pilot subcarrier contained in the DRU4 is -85 and 167; The index of the pilot subcarrier contained in the DRU5 is -27 and 225; The index of the pilot subcarrier contained in the DRU6 is -96 and 156; The index of the pilot subcarrier contained in the DRU7 is -213 and 39; The index of the pilot subcarrier contained in the DRU8 is -38 and 214; The index of the pilot subcarrier contained in the DRU9 is -155 and 97; The DRU 10 comprises pilot subcarriers with indices -61 and 191; The DRU 11 comprises pilot subcarriers with indices -178 and 74; The DRU 12 comprises pilot subcarriers with indices -201 and 51; The DRU 13 comprises pilot subcarriers with indices -120 and 132; The DRU 14 comprises pilot subcarriers with indices -108 and 144; The DRU 15 comprises pilot subcarriers with indices -131 and 121; The DRU 16 comprises pilot subcarriers with indices -50 and 202; The DRU 17 comprises pilot subcarriers with indices -73 and 179; The DRU 18 comprises pilot subcarriers with indices -190 and 62. The method according to any one of claims 23 to 28, characterized in that The first discrete bandwidth comprises DRUs 1 to 16; the DRUs 1 to 16 satisfy one or more of The DRU 1 comprises pilot subcarriers with indices -467, -159, 33 and 341; The DRU 2 comprises pilot subcarriers with indices -295, -171, 205 and 329; The DRU 3 comprises pilot subcarriers with indices -443, -319, 57 and 181; The DRU 4 comprises pilot subcarriers with indices -455, -147, 45 and 353; The DRU 5 comprises pilot subcarriers with indices -369, -245, 131 and 255; The DRU 6 comprises pilot subcarriers with indices -381, -73, 119 and 427; The DRU 7 comprises pilot subcarriers with indices -393, -85, 107 and 415; The DRU 8 comprises pilot subcarriers with indices -221, -97, 279 and 403; The DRU 9 comprises pilot subcarriers with indices -430, -122, 70 and 378; The DRU 10 comprises pilot subcarriers with indices -258, -134, 242 and 366; The DRU 11 comprises pilot subcarriers with indices -406, -282, 94 and 218; The DRU 12 comprises pilot subcarriers with indices -418, -110, 82 and 390; The DRU 13 comprises pilot subcarriers with indices -332, -208, 168 and 292; The DRU 14 comprises pilot subcarriers with indices -344, -36, 156 and 464; The DRU 15 comprises pilot subcarriers with indices -356, -48, 144 and 452; The DRU 16 comprises pilot subcarriers with indices -184, -60, 316 and 440. A communication device, characterized by A module for performing the method of any of claims 1 to 31. A communication device, characterized by A processor for performing the method of any of claims 1 to 31. A communication device, characterized by A logic circuit and an interface coupled; The interface is for inputting and / or outputting information, and the logic circuit is for performing the method of any of claims 1 to 31. A computer-readable storage medium, characterized by, The computer readable storage medium is for storing a computer program which, when executed, performs the method of any of claims 1-31. A computer program product, characterized in that The computer program product, when executed, performs the method of any of claims 1-31.

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