Communication method and device

Abstract

The present application relates to the technical field of wireless communications, and in particular to a communication method and device. The relative positions, in a first DRU, of the pilot subcarriers of the first DRU in subcarrier planning corresponding to the transmission bandwidth are identical or symmetrical to the relative positions, in a second DRU, of the pilot subcarriers of the second DRU. In this way, the implementation complexity of subcarrier mapping and de-mapping can be reduced, and the design complexity of LTF sequences is reduced. The present application can support IEEE protocols such as an IEEE 802.11be / WiFi 7 / EHT protocol, an IEEE 802.11bn / UHR / WiFi 8 protocol, an IEEE 802.15 / UWB protocol, an IEEE 802.11bf / sensing protocol, and an integrated millimeter wave (IMMW) protocol.

Description

Communication methods and devices

[0001] This application claims priority to Chinese Patent Application No. 202410519065.0, filed on April 26, 2024, entitled "Communication Method and Apparatus", the entire contents of which are incorporated herein by reference. Technical Field

[0002] This application relates to the field of wireless communication technology, and in particular to a communication method and apparatus. Background Technology

[0003] One telecommunications standards organization published regulations for the 6 GHz spectrum, limiting the maximum transmit power to 23 dBm (decibel-milliwatts) and the maximum power spectral density to 10 dBm / MHz (decibel-milliwatts / megahertz). Another communications commission also issued regulations for the 6 GHz spectrum, defining a low-power indoor (LPI) communication method with strict limits on maximum transmit power and maximum power spectral density. For access points (APs), the maximum transmit power is limited to 36 dBm, and the maximum power spectral density is 5 dBm / MHz. For stations (STAs), the maximum transmit power is limited to 24 dBm, and the maximum power spectral density is -1 dBm / MHz. The transmit power of a device is limited by both the maximum power and the maximum power spectral density; that is, the transmit power cannot exceed the maximum power value, and the transmitted power spectral density (PSD) cannot exceed the maximum power spectral density. Compared to maximum power, maximum power spectral density is a more stringent limitation, and the maximum power that can be transmitted is usually more constrained by the power spectral density. For a station, the transmission power only reaches the specified maximum power limit when the bandwidth is 320MHz. When the bandwidth is less than 320MHz, due to the limitation of maximum power spectral density, the station can only transmit at a lower power (meaning lower than the specified maximum power).

[0004] Based on this, the Distributed Resource Unit (DRU) technology was proposed to improve transmission power. The basic idea of ​​DRU is to discretize the continuous subcarriers within a resource unit (RU) across the widest possible bandwidth to reduce the number of subcarriers within 1MHz, thereby increasing the transmission power of each subcarrier and thus improving the total transmission power.

[0005] Therefore, how to design the pilot subcarriers of the DRU has become an urgent problem to be solved. Summary of the Invention

[0006] This application relates to a communication method and apparatus, which details the design of pilot subcarriers for DRUs of different sizes. The designed pilot subcarriers can effectively reduce the types of different DRUs of the same size, thereby effectively reducing the implementation complexity of subcarrier mapping and demapping, and simplifying the design complexity of long training field (LTF) sequences.

[0007] In a first aspect, embodiments of this application provide a communication method, which can be applied to a first communication device. The first communication device may include a wireless local area network (WLAN) device (including Wi-Fi devices, etc.), or a chip, functional module, processing system, or communication component disposed within the WLAN device. The method includes:

[0008] The first communication device generates orthogonal frequency division multiplexing (OFDM) symbols according to the subcarrier planning corresponding to the transmission bandwidth; and transmits the OFDM symbols; the subcarrier planning corresponding to the transmission bandwidth includes a first DRU, wherein when the transmission bandwidth is 20MHz or 40MHz, the first DRU is any one of the DRUs with 26 subcarriers in the subcarrier planning corresponding to the transmission bandwidth; and when the transmission bandwidth is greater than 40MHz, the first DRU is any one of the DRUs with 52 subcarriers in the subcarrier planning corresponding to the transmission bandwidth.

[0009] The pilot subcarrier of the first DRU satisfies at least one of the following:

[0010] The relative positions of pilot subcarriers with indices greater than 0 in the first DRU are symmetrical to the relative positions of pilot subcarriers with indices less than 0 in the first DRU; or...

[0011] The relative positions of the pilot subcarriers of the first DRU in the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers of the second DRU in the second DRU. The subcarrier indexes in the second DRU are different from those in the first DRU, and the number of subcarriers in the first DRU is the same as that in the second DRU.

[0012] A DRU refers to a set of multiple subcarriers with discrete indices, or in other words, the indices of adjacent subcarriers included in the DRU are not consecutive. For example, the indices of any two adjacent subcarriers included in the DRU can be non-consecutive.

[0013] In this embodiment, the pilot subcarriers in the subcarrier planning corresponding to the transmission bandwidth are designed in detail. By designing the relationship between the pilot subcarriers of the first DRU and the pilot subcarriers of the second DRU, the designed pilot subcarriers can minimize the types of different DRUs in the subcarrier planning corresponding to the transmission bandwidth, thereby reducing the implementation complexity of subcarrier mapping and demapping. Typically, a subcarrier mapper and demapping device needs to be designed for each type of DRU; therefore, the more types of DRUs there are, the higher the implementation complexity of subcarrier mapping and demapping. However, the method provided in this embodiment can minimize the types of different DRUs.

[0014] Furthermore, since LTF sequences are designed based on individual DRUs, minimizing the number of DRU types can simplify the design complexity of LTF sequences. Typically, LTF sequences require optimization for each DRU type; therefore, too many DRU types increase the design complexity of LTF sequences.

[0015] Secondly, embodiments of this application provide a communication method, which can be applied to a second communication device. This second communication device may include a WLAN device (including a Wi-Fi device, etc.), or a chip, functional module, processing system, or communication component disposed within the WLAN device. The method includes:

[0016] The second communication device receives OFDM symbols; it parses the OFDM symbols according to the subcarrier plan corresponding to the transmission bandwidth; the subcarrier plan corresponding to the transmission bandwidth includes a first DRU. When the transmission bandwidth is 20MHz or 40MHz, the first DRU is any one of the DRUs with 26 subcarriers in the subcarrier plan corresponding to the transmission bandwidth; when the transmission bandwidth is greater than 40MHz, the first DRU is any one of the DRUs with 52 subcarriers in the subcarrier plan corresponding to the transmission bandwidth.

[0017] The pilot subcarrier of the first DRU satisfies at least one of the following:

[0018] The relative positions of pilot subcarriers with indices greater than 0 in the first DRU are symmetrical to the relative positions of pilot subcarriers with indices less than 0 in the first DRU.

[0019] The relative positions of the pilot subcarriers of the first DRU in the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers of the second DRU in the second DRU. The subcarrier indexes in the second DRU are different from those in the first DRU, and the number of subcarriers in the first DRU is the same as that in the second DRU.

[0020] For an explanation of the beneficial effects of the second aspect, please refer to the first aspect; it will not be elaborated here.

[0021] In conjunction with the first or second aspect, in one possible implementation, the transmission bandwidth is 20MHz, and the first DRU and the second DRU each include 26 subcarriers; the index of the pilot subcarrier of the first DRU or the second DRU includes one of the following indices: a:S:(a+8*S); the index of the pilot subcarrier of the first DRU or the second DRU includes one of the following indices:-(a+8*S):S:-a; where a and S are both positive integers.

[0022] a:S:(a+8*S) represents the index of 9 pilot subcarriers within the index range where the index is greater than 0 (i.e., the upper half-band), and -(a+8*S):S:-a can represent the index of 9 pilot subcarriers within the index range where the index is less than 0 (i.e., the lower half-band).

[0023] In this embodiment, the pilot subcarriers are evenly distributed in the lower and upper half-bands, which effectively avoids the aggregation of pilot subcarriers within a small frequency range, thus affecting the accuracy of channel estimation and improving the accuracy of channel estimation. Furthermore, the nine pilot subcarriers in the lower half-band are symmetrically related to the nine subcarriers in the upper half-band, thereby minimizing the types of different DRUs in the subcarrier planning corresponding to the transmission bandwidth.

[0024] Combining the first or second aspect, in one possible implementation, a>12 and a+8*S<112.

[0025] In this embodiment, the minimum value of 'a' and the maximum value of 'a+8*S', by satisfying the above conditions, can effectively prevent the pilot subcarrier from being located near the guard subcarrier or DC subcarrier, and avoid using the subcarrier with the largest or smallest index of the 26-tone DRU as the pilot subcarrier. Therefore, it can effectively improve the distortion of radio frequency devices and reduce power leakage.

[0026] Combining the first or second aspect, in one possible implementation, the greatest common divisor of S and 9 is 1.

[0027] In this embodiment, S and 9 are prime numbers, which can effectively ensure that each 26-tone DRU has one pilot subcarrier in the index range where the index is greater than 0, and one pilot subcarrier in the index range where the index is less than 0.

[0028] In combination with the first or second aspect, in one possible implementation, S = 11, a = 19, and the index of the 18 pilot subcarriers can be [-107:11:-19, 19:11:107].

[0029] In combination with the first or second aspect, in one possible implementation, S = 10, a = 23, and the index of the 18 pilot subcarriers can be [-103:10:-23,23:10:103].

[0030] In combination with the first or second aspect, in one possible implementation, S = 8, a = 31, and the index of the 18 pilot subcarriers can be [-95:8:-31,31:10:95].

[0031] In conjunction with the first or second aspect, in one possible implementation, the transmission bandwidth is 40MHz; the first DRU and the second DRU each include 26 subcarriers; the index of the pilot subcarrier of the first DRU or the second DRU includes one of the following indices: a:S:(a+17*S); the index of the pilot subcarrier of the first DRU or the second DRU includes one of the following indices:-(b+17*S):S:-b; where a, b, and S are all positive integers.

[0032] Combining the first or second aspect, in one possible implementation, a > 27 and a + 17 * S < 226.

[0033] Combining the first or second aspect, in one possible implementation, the difference between a and b is an integer multiple of S.

[0034] In combination with the first or second aspect, in one possible implementation, S = 11, a = 38, b = 27, and the index of the 36 pilot subcarriers can be [-214:11:-27,38:11:225].

[0035] In conjunction with the first or second aspect, in one possible implementation, the transmission bandwidth is 80MHz; the first DRU and the second DRU each comprise 52 subcarriers, and the first DRU and the second DRU are two DRUs selected from 52-tone DRU 1 to 52-tone DRU 16; for 52-tone DRU 1 to 52-tone DRU 16, the k-th pilot subcarrier of each DRU satisfies: c k :11:(165+c k )

[0036] Among them, c k This indicates the relative position of the k-th pilot subcarrier in 52-tone DRU 1 to 52-tone DRU 16, where k = 1, 2, 3, 4.

[0037] Combining the first or second aspect, in one possible implementation, c1 = 32, c2 = 224, c3 = 448, c4 = 640.

[0038] In conjunction with the first or second aspect, in one possible implementation, the indices of the 64 pilot subcarriers can be [-452,-437,-426,-411,-400,-389,-374,-363,-352,-337,-326,-315,-300,-289,-278,-263,-236,-221,-210,-195,-184,-173,-158,-147, -136,-121,-110,-99,-84,-73,-62,-47,48,63,74,89,100,111,126,137,148,163,174,185,200,211,222,237,264,279,290,305,316,327,342,353,364,379,390,401,416,427,438,453).

[0039] In conjunction with the first or second aspect, in one possible implementation, the indexes of the 64 pilot subcarriers can be [-440, -429, -418, -407, -396, -385, -366, -355, -344, -333, -322, -311, -300, -289, -278, -267, -240, -229, -218, -207, -196, -185, -174, -163, -1 52,-133,-122,-111,-100,-89,-78,-67,72,83,94,105,116,127,146,157,168,179,190,201,212,223,234,245,272,283,294,305,316,327,338,349,360,379,390,401,412,423,434,445).

[0040] In this embodiment, pilot subcarriers for different DRUs are designed under an 80MHz bandwidth, so that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 52-tone DRUs, 52-tone DRU1 and 52-tone DRU16 belong to the same type, 52-tone DRU3 and 52-tone DRU14 belong to the same type, 52-tone DRU4 and 52-tone DRU13 belong to the same type, 52-tone DRU5 and 52-tone DRU12 belong to the same type, and 52-tone DRU6 and 52-tone DRU11 belong to the same type. This can reduce the implementation complexity of subcarrier mapping and demapping, and simplify the design of DRU LTF sequences.

[0041] In combination with the first or second aspect, in one possible implementation, the transmission bandwidth is 80MHz;

[0042] The first DRU and the second DRU each comprise 52 subcarriers. The first DRU and the second DRU are two DRUs selected from 52-tone DRU 1 to 52-tone DRU 16. For 52-tone DRU 1 to 52-tone DRU 16, the k-th pilot subcarrier of each DRU satisfies:

[0043] Where f(n,k) represents the relative position of the k-th pilot subcarrier of the n-th 52-tone DRU in 52-tone DRU 1 to 52-tone DRU 16, n = 1, 2, ..., 16; c k This indicates the relative position of the k-th pilot subcarrier in 52-tone DRU 1 to 52-tone DRU 16, where k = 1, 2, 3, 4; Indicates to Round down to the nearest integer.

[0044] Combining the first or second aspect, in one possible implementation, c1 = 23, c2 = 215, c3 = 439, c4 = 631.

[0045] In conjunction with the first or second aspect, in one possible implementation, the indices of the 64 pilot subcarriers can be [-461,-445,-433,-421,-404,-392,-380,-364,-351,-335,-323,-311,-294,-282,-266,-254,-245,-229,-217,-205,-188,-176,-164,-148, -135,-119,-107,-95,-78,-66,-50,-38,39,55,67,79,96,108,120,136,149,165,177,189,206,218,234,246,255,271,283,295,312,324,336,352,365,381,393,405,422,434,450,462).

[0046] In conjunction with the first or second aspect, in one possible implementation, the indexes of the 64 pilot subcarriers can be [-449, -437, -425, -413, -400, -388, -376, -356, -343, -331, -319, -307, -294, -282, -270, -258, -249, -237, -225, -213, -200, -188, -176, -164, - 151,-131,-119,-107,-94,-82,-70,-58,63,75,87,99,112,124,136,156,169,181,193,205,218,230,242,254,263,275,287,299,312,324,336,348,361,381,393,405,418,430,442,454).

[0047] In this embodiment, pilot subcarriers for the DRU with an 80MHz bandwidth are designed, ensuring that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 52-tone DRUs, 52-tone DRU1, 52-tone DRU4, and 52-tone DRU13 belong to the same type; 52-tone DRU3, 52-tone DRU14, and 52-tone DRU15 belong to the same type; 52-tone DRU5, 52-tone DRU9, and 52-tone DRU12 belong to the same type; 52-tone DRU6, 52-tone DRU7, and 52-tone DRU11 belong to the same type; and 52-tone DRU8 and 52-tone DRU10 belong to the same type. This effectively reduces the complexity of subcarrier mapping and demapping, while simplifying the design of the DRU LTF sequence.

[0048] The above examples illustrate the features satisfied by 26-tone DRU and 52-tone DRU. For the features satisfied by 106-tone DRU, 242-tone DRU and 484-tone DRU, please refer to 26-tone DRU or 52-tone DRU, which will not be described in detail here.

[0049] Thirdly, embodiments of this application provide a communication method, which can be applied to a first communication device. The first communication device may include a WLAN device (including a Wi-Fi device, etc.), or a chip, functional module, processing system, or communication component disposed within the WLAN device. The method includes:

[0050] The first communication device generates orthogonal frequency division multiplexing (OFDM) symbols according to the subcarrier planning corresponding to the transmission bandwidth; and transmits the OFDM symbols; the transmission bandwidth is 40MHz, and the subcarrier planning corresponding to the transmission bandwidth is 26-tone DRU 1 to 26-tone DRU 18, each 26-tone DRU includes 2 pilot subcarriers, and 26-tone DRU 1 to 26-tone DRU 18 correspond to 36 subcarriers, in which the index of the pilot subcarrier with an index greater than 0 is the opposite of the index of the pilot subcarrier with an index less than 0.

[0051] Fourthly, embodiments of this application provide a communication method, which can be applied to a second communication device. The second communication device may include a WLAN device (including a Wi-Fi device, etc.), or a chip, functional module, processing system, or communication component disposed within the WLAN device. The method includes:

[0052] The second communication device receives OFDM symbols; it parses the OFDM symbols according to the subcarrier planning corresponding to the transmission bandwidth; the transmission bandwidth is 40MHz, and the subcarrier planning corresponding to the transmission bandwidth is 26-tone DRU 1 to 26-tone DRU 18, each 26-tone DRU includes 2 pilot subcarriers, and 26-tone DRU 1 to 26-tone DRU 18 correspond to 36 subcarriers, in which the index of the pilot subcarrier with an index greater than 0 is the opposite of the index of the pilot subcarrier with an index less than 0.

[0053] In conjunction with the third or fourth aspect, in one possible implementation, the index difference between two adjacent pilot subcarriers among the 36 pilot subcarriers is 10, 11, or 12.

[0054] In conjunction with the third or fourth aspect, in one possible implementation, the index of the 36 pilot subcarriers can be [-205,-195,-184,-174,-164,-154,-144,-134,-124,-113,-103,-91,-81,-71,-60,-50,-39,-29,29,39,50,60,71,81,91,103,113,124,134,144,154,164,174,184,195,205].

[0055] In conjunction with the third or fourth aspect, in one possible implementation, the index of the 36 pilot subcarriers can be [-205,-195,-184,-174,-163,-153,-143,-131,-121,-110,-100,-90,-80,-70,-60,-50,-39,-29,29,39,50,60,70,80,90,100,110,121,131,143,153,163,174,184,195,205].

[0056] Fifthly, embodiments of this application provide a communication method, which can be applied to a first communication device. The first communication device may include a wireless local area network (WLAN) device (including Wi-Fi devices, etc.), or a chip, functional module, processing system, or communication component that can be disposed within the WLAN device. The method includes:

[0057] The first communication device generates orthogonal frequency division multiplexing (OFDM) symbols based on the subcarrier planning corresponding to the transmission bandwidth; and transmits the OFDM symbols.

[0058] Sixthly, embodiments of this application provide a communication method, which can be applied to a second communication device. The second communication device may include a WLAN device (including a Wi-Fi device, etc.), or a chip, functional module, processing system, or communication component disposed within the WLAN device. The method includes:

[0059] The second communication device receives the OFDM symbol and parses the OFDM symbol according to the subcarrier planning corresponding to the transmission bandwidth.

[0060] In conjunction with the fifth or sixth aspect, the transmission bandwidth is 20MHz, and the subcarrier planning corresponding to this transmission bandwidth includes 26-tone DRU 1 to 26-tone DRU 9; or, includes 52-tone DRU 1 to 52-tone DRU 4; or, includes 106-tone DRU 1 to 106-tone DRU 2; each 52-tone DRU in 52-tone DRU 1 to 52-tone DRU 4 includes two 26-tone DRUs, and each 106-tone DRU in 106-tone DRU 1 or 106-tone DRU 2 includes four 26-tone DRUs (or includes two 52-tone DRUs);

[0061] The first DRU is any one of the 26-tone DRUs 1 to 26-tone DRU 9, and the pilot subcarriers of the first DRU satisfy at least one of the following: the relative positions of the pilot subcarriers with indices greater than 0 in the first DRU are symmetrical to the relative positions of the pilot subcarriers with indices less than 0 in the first DRU; the relative positions of the pilot subcarriers of the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers of the second DRU in the second DRU; the subcarrier indices in the second DRU are different from the subcarrier indices in the first DRU; and the number of subcarriers in the first DRU is the same as the number of subcarriers in the second DRU.

[0062] or,

[0063] The transmission bandwidth is 40MHz, and the subcarrier planning corresponding to this transmission bandwidth includes 26-tone DRU 1 to 26-tone DRU 18; or, includes 52-tone DRU 1 to 52-tone DRU 8; or, includes 106-tone DRU 1 to 106-tone DRU 4; or, includes 242-tone DRU 1 to 242-tone DRU 2; each 52-tone DRU in 52-tone DRU 1 to 52-tone DRU 8 includes two 26-tone DRUs, each 106-tone DRU in 106-tone DRU 1 to 106-tone DRU 4 includes four 26-tone DRUs (or includes two 52-tone DRUs), and 242-tone DRU 1 or 242-tone DRU 2 includes two 106-tone DRUs and one 26-tone DRU;

[0064] The first DRU is any one of the 26-tone DRUs 1 to 26-tone DRU 18, and the pilot subcarriers of the first DRU satisfy at least one of the following: the relative positions of the pilot subcarriers with indices greater than 0 in the first DRU are symmetrical to the relative positions of the pilot subcarriers with indices less than 0 in the first DRU; the relative positions of the pilot subcarriers of the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers of the second DRU in the second DRU; the subcarrier indices in the second DRU are different from the subcarrier indices in the first DRU; and the number of subcarriers in the first DRU is the same as the number of subcarriers in the second DRU.

[0065] or,

[0066] The transmission bandwidth is 80MHz, and the subcarrier planning corresponding to this transmission bandwidth includes 52-tone DRU 1 to 52-tone DRU 16; or, includes 106-tone DRU 1 to 106-tone DRU 8; or, includes 242-tone DRU 1 to 242-tone DRU 4; or, includes 484-tone DRU 1 to 484-tone DRU 2; each 106-tone DRU in 1 to 106-tone DRU 8 includes four 26-tone DRUs, each 242-tone DRU in 1 to 242-tone DRU 4 includes two 106-tone DRUs, and 484-tone DRU 1 or 484-tone DRU 2 includes two 242-tone DRUs;

[0067] The first DRU is any one of 52-tone DRU 1 to 52-tone DRU 18, and the pilot subcarriers of the first DRU satisfy at least one of the following: the relative positions of the pilot subcarriers with indices greater than 0 in the first DRU are symmetrical to the relative positions of the pilot subcarriers with indices less than 0 in the first DRU; the relative positions of the pilot subcarriers of the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers of the second DRU in the second DRU; the subcarrier indices in the second DRU are different from the subcarrier indices in the first DRU; and the number of subcarriers in the first DRU is the same as the number of subcarriers in the second DRU.

[0068] In this embodiment of the application, when the transmission bandwidth is 40MHz, for a 242-tone DRU, the four pilot subcarriers in the 242-tone DRU can be four of the eight subcarriers corresponding to the two 106-tone DRUs included in the 242-tone DRU; or, the four pilot subcarriers in the 242-tone DRU can be four of the ten subcarriers corresponding to the two 106-tone DRUs and one 26-tone DRU included in the 242-tone DRU.

[0069] For explanations regarding the fifth or sixth aspect, please refer to the first or second aspect; they will not be elaborated upon here.

[0070] In a seventh aspect, embodiments of this application provide a communication device for executing the methods in any one of the first to sixth aspects or any possible implementations thereof. The first communication device includes a module having the capability to execute the methods in any one of the first to sixth aspects or any possible implementations thereof.

[0071] Eighthly, embodiments of this application provide a communication device including a processor for executing the methods shown in any one of the first to sixth aspects or any possible implementations thereof. The processor executes a program stored in a memory, and when the program is executed, the methods shown in any one of the first to sixth aspects or any possible implementations thereof are executed.

[0072] In one possible implementation, the memory is located outside the aforementioned communication device.

[0073] In one possible implementation, the memory is located within the aforementioned communication device.

[0074] In this embodiment, the processor and memory can also be integrated into a single device, that is, the processor and memory can be integrated together. For example, the communication device can be a chip.

[0075] In one possible implementation, the communication device further includes a transceiver for receiving or sending information.

[0076] Ninthly, embodiments of this application provide a communication device including a logic circuit and an interface, the logic circuit and the interface being coupled; the interface is used for inputting and / or outputting information, and the logic circuit is used for performing the method as described in any one of the first to sixth aspects or any possible implementation thereof.

[0077] In a tenth aspect, embodiments of this application provide a computer-readable storage medium for storing a computer program that, when run on a computer, causes the methods shown in any of the first to sixth aspects or any possible implementation thereof to be executed.

[0078] In one aspect, embodiments of this application provide a computer program product that, when run on a computer, causes the methods shown in any of the first to sixth aspects or any possible implementations above to be executed.

[0079] In a twelfth aspect, embodiments of this application provide a communication system comprising a first communication device and a second communication device. The first communication device is configured to perform the method shown in the first aspect or any possible implementation thereof, and the second communication device is configured to perform the method shown in the second aspect or any possible implementation thereof. Alternatively, the communication system comprises a first communication device and a second communication device, the first communication device being configured to perform the method shown in the third aspect or any possible implementation thereof, and the second communication device being configured to perform the method shown in the fourth aspect or any possible implementation thereof. Alternatively, the communication system comprises a first communication device and a second communication device, the first communication device being configured to perform the method shown in the fifth aspect or any possible implementation thereof, and the second communication device being configured to perform the method shown in the sixth aspect or any possible implementation thereof. Attached Figure Description

[0080] Figure 1 is a schematic diagram of the architecture of the communication system provided in an embodiment of this application;

[0081] Figure 2a is a schematic diagram of the 20MHz subcarrier distribution and RU distribution provided in an embodiment of this application;

[0082] Figure 2b is a schematic diagram of the 40MHz subcarrier distribution and RU distribution provided in an embodiment of this application;

[0083] Figure 2c is a schematic diagram of the 80MHz subcarrier distribution and RU distribution provided in an embodiment of this application;

[0084] Figure 3a is a schematic diagram of the uplink multi-user transmission process provided in an embodiment of this application;

[0085] Figure 3b is a schematic diagram of the frame format of the EHT variant user information field provided in the embodiments of this application;

[0086] Figure 4 is a flowchart illustrating the communication method provided in an embodiment of this application;

[0087] Figure 5a is a schematic diagram of the process of generating OFDM symbols by the first communication device provided in the embodiment of this application;

[0088] Figure 5b is a schematic diagram of the process of parsing OFDM symbols by the second communication device provided in the embodiment of this application;

[0089] Figure 6a is a symmetrical schematic diagram provided in an embodiment of this application;

[0090] Figure 6b is a schematic diagram of absolute and relative positions provided in an embodiment of this application;

[0091] Figure 6c is a symmetrical schematic diagram provided in an embodiment of this application;

[0092] Figure 7 is a schematic diagram of a communication device provided in an embodiment of this application;

[0093] Figure 8 is a schematic diagram of another structure of the communication device provided in an embodiment of this application;

[0094] Figure 9 is a schematic diagram of another structure of the communication device provided in the embodiments of this application. Detailed Implementation

[0095] To facilitate understanding of the technical solution of this application, the application will be further described below with reference to the accompanying drawings.

[0096] The terms "first" and "second," etc., used in the specification, claims, and drawings of this application are used only to distinguish different objects and not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0097] The term "embodiment" as used herein means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0098] In this application, "at least one (item)" refers to one or more, "more than one" refers to two or more, "at least two (items)" refers to two or three or more, and "and / or" is used to describe the relationship between related objects, indicating that there can be three relationships. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist simultaneously, where A and B can be singular or plural. "Or" indicates that there can be two relationships, such as only A exists or only B exists; when A and B are not mutually exclusive, it can also mean that there are three relationships, such as only A exists, only B exists, or both A and B exist simultaneously. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one (item) of the following" or similar expressions refer to any combination of these items. For example, at least one (item) of a, b, or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c".

[0099] In this application, "send" and "receive" indicate the direction of signal transmission. For example, "send information to XX" can be understood as the destination of the information being XX, which can include direct transmission via the air interface or indirect transmission via the air interface from other units or modules. "Receive information from YY" can be understood as the source of the information being YY, which can include direct reception from YY via the air interface or indirect reception from YY via the air interface from other units or modules. "Send" can also be understood as the "output" of a chip interface, and "receive" can also be understood as the "input" of a chip interface. In other words, sending and receiving can occur between devices, such as between network devices and terminal devices, or within a device, such as between components, modules, chips, software modules, or hardware modules within the device via buses, traces, or interfaces.

[0100] This application provides a communication method and apparatus that improves the pilot subcarrier planning in the subcarrier planning corresponding to the transmission bandwidth. This pilot subcarrier can be uniformly distributed within the transmission bandwidth, effectively mitigating the impact of narrowband interference. Furthermore, the pilot subcarrier provided in this application can effectively reduce the complexity of subcarrier mapping and demapping.

[0101] The following describes the system involved in the embodiments of this application.

[0102] The technical solutions provided in this application can be applied to WLAN systems, such as Wi-Fi. For example, the technical solutions provided in this application can be applied to the Institute of Electrical and Electronics Engineers (IEEE) 802.11 series protocols (or standards), such as the 802.11be protocol, the 802.11bn protocol (or Wi-Fi 8, also known as Ultra High Reliability (UHR) or Ultra High Reliability and Throughput (UHRT)), or next-generation protocols of the 802.11bn protocol, or protocols supporting ambient power (AMP), etc., and will not be listed exhaustively. The technical solutions provided in this application can also be applied to wireless personal area networks (WPANs) based on millimeter wave (MMW) technologies, such as integrated millimeter wave (IMMW) and ultra-wideband (UWB) technologies. The technical solutions provided in the embodiments of this application can be applied to the IEEE 802.15 series protocols, such as the 802.15.4a, 802.15.4z, or 802.15.4ab protocols, or future UWB WPAN protocols, etc., and will not be listed one by one. The technical solutions provided in the embodiments of this application can also be applied to the Spark Link or NearLink standard protocol. The technical solutions provided in the embodiments of this application can also be applied to the following communication systems, such as Internet of Things (IoT) systems, vehicle-to-everything (V2X, where X can represent anything), device-to-device (D2D), narrowband Internet of Things (NB-IoT) systems, long term evolution (LTE) systems, 5th generation (5G) communication systems, and new communication systems that will emerge in the future development of communication, etc.For example, V2X can include vehicle-to-vehicle (V2V), vehicle-to-infrastructure (V2I), vehicle-to-pedestrian (V2P), or vehicle-to-network (V2N) communication.

[0103] WLAN systems can provide high-speed, low-latency transmission. As WLAN application scenarios continue to evolve, WLAN systems 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 and exhibition halls, concert halls, hotel rooms, dormitories, hospital wards, classrooms, shopping malls, squares, streets, production workshops and warehouses, etc. Of course, devices that support WLAN communication or sensing (such as access points or sites) can be sensor nodes in smart cities (such as smart water meters, smart electricity meters, and smart air monitoring nodes), smart devices in smart homes (such as smart cameras, projectors, displays, televisions, speakers, refrigerators, and washing machines), nodes in the Internet of Things (IoT), entertainment terminals (such as wearable devices for augmented reality (AR) and virtual reality (VR), smart devices in smart offices (such as printers, projectors, loudspeakers, and speakers), vehicle-to-everything (V2X) devices, infrastructure in daily life scenarios (such as vending machines, self-service navigation kiosks in supermarkets, self-service checkout machines, and self-service ordering machines), and equipment in large sports and music venues.

[0104] Although the embodiments of this application primarily use WLAN as an example, especially networks applied to the IEEE 802.11 series of standards, the various aspects involved in the embodiments of this application can be extended to other networks employing 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 networks (WANs) or other networks now known or to be developed in the future.

[0105] In one possible implementation, the method provided in this application embodiment 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).

[0106] An Access Point (AP) is a device with wireless communication capabilities that supports communication, sensing, or power transmission using WLAN protocols. It has the function of communicating or sensing with other devices in a WLAN network (such as non-access point stations (non-AP STAs) or other access points), and can also have the function of communicating, sensing, or transmitting power with other devices. Alternatively, an access point acts as a bridge connecting wired and wireless networks, primarily connecting various wireless network clients together and then connecting the wireless network to an Ethernet network. In a WLAN system, an access point can be called an Access Point Station (AP STA). This wireless communication device can be a complete device or a chip, processing system, or functional module installed within a complete device. Devices with these chips, processing systems, or functional modules can implement the methods and functions of the embodiments in this application under the control of the chips, processing systems, or functional modules. The AP in the embodiments of this application is a device that provides services to non-AP STAs and can support 802.11 series protocols or subsequent protocols. For example, an access point can be an access point for a terminal (such as a mobile phone) to enter a wired (or wireless) network, mainly deployed in homes, buildings, and parks, with a typical coverage radius of tens to hundreds of meters. Of course, it can also be deployed outdoors. Another example is that an AP can be a communication entity such as a communication server, router, switch, or bridge; APs can include various forms of macro base stations, micro base stations, and repeater stations. Of course, an AP can also be a chip, processing system, or module within the above-mentioned devices, thereby implementing the methods and functions of the embodiments of this application.

[0107] A Station-Style (STA) is a device with wireless communication capabilities that supports communication, sensing, or power transmission using the WLAN protocol. It has the ability to communicate, sense, or transmit power with other non-AP STAs or access points in a WLAN network. In a WLAN system, a station can be called a non-access point station (non-AP STA). For example, an STA is any user communication device that allows a user to communicate with an AP (Access Point) or sense or transmit power, and thus communicate with the WLAN. This wireless communication device can be a complete device, or it can be a chip, processing system, or functional module installed in a complete device. Devices with these chips, processing systems, or functional modules can implement the methods and functions of the embodiments of this application under the control of the chips, processing systems, or functional modules. For example, an STA can be a wireless communication chip, a wireless sensor, or a wireless communication terminal, and can also be referred to as a user. Furthermore, an STA can be a mobile phone supporting Wi-Fi communication, a tablet computer supporting Wi-Fi communication, a set-top box supporting Wi-Fi communication, a smart TV supporting Wi-Fi communication, a smart wearable device supporting Wi-Fi communication, an in-vehicle communication device supporting Wi-Fi communication, and a computer supporting Wi-Fi communication. Of course, STA can also be a chip, processing system, or module in the various types of devices described above, thereby implementing the methods and functions of the embodiments of this application.

[0108] For example, the communication systems to which the methods provided in this application can be applied may include access points and stations. For instance, this application can be applied to scenarios of communication or sensing between APs and STAs, between APs, or between STAs in a WLAN, and this application does not limit this. Optionally, an AP can communicate or sense with a single STA, or an AP can communicate or sense with multiple STAs simultaneously. Specifically, communication or sensing between an AP and multiple STAs can be further divided into downlink transmission where the AP simultaneously sends signals to multiple STAs, and uplink transmission where multiple STAs send signals to the AP. The communication protocols between APs and STAs, between APs, and between STAs can support WLAN communication protocols, which may include IEEE 802.11 series protocols, such as the 802.11bn protocol, and of course, protocols after 802.11bn.

[0109] Figure 1 is a schematic diagram of the architecture of a communication system provided in an embodiment of this application. The communication system may include one or more APs and one or more STAs. Figure 1 shows two access points, such as AP1 and AP2, and three stations, such as STA1, STA2, and STA3. As an example, the method provided in this embodiment can be applied to data communication, sensing, or power transmission between an AP and one or more STAs, such as the communication or sensing between AP1 and STA1 as shown in Figure 1, and the communication or sensing between AP1 and STA1 / STA2 as shown in Figure 1. As another example, the method provided in this embodiment can be applied to communication between APs, such as the communication or sensing between AP1 and AP2 as shown in Figure 1. As yet another example, the method provided in this embodiment can be applied to communication or sensing between STAs, such as the communication or sensing between STA2 and STA3 as shown in Figure 1.

[0110] Figure 1 uses STA (Mobile Phone) and AP (Router) as an example, and does not imply a limitation on the types of APs and STAs in this application embodiment. Furthermore, the number of APs and STAs shown in Figure 1 is merely an example; in a specific implementation, the number of APs or STAs may be more or less, and this application embodiment does not limit this.

[0111] From the different perspectives of transmitting and receiving OFDM symbols, the first communication device described below can be understood as a communication device that transmits OFDM symbols, and the second communication device can be understood as a communication device that receives OFDM symbols. Alternatively, the first communication device can also be called the transmitter, and the second communication device can also be called the receiver.

[0112] From the perspective of different devices, as an example, the first communication device and the second communication device can be Wi-Fi chips, functional modules, or processing systems installed in different Wi-Fi devices. As another example, the first communication device can be an access point (AP), and the second communication device can be a non-AP STA. As yet another example, both the first and second communication devices can be non-AP STAs or both can 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 and second communication devices can be a multi-link device (MLD), etc., which will not be listed in detail in this application. For example, an MLD refers to a device that simultaneously has multiple sites (such as APs or non-AP STAs), each operating on different frequency bands or channels. A multi-link device includes multiple affiliated sites, which can be physical sites or logical sites, and each site can operate on a link, a frequency band, or a channel, etc. The aforementioned affiliated sites can be APs or non-AP STAs. Multilink devices (such as non-AP MLDs or AP MLDs) can be communication devices with wireless communication capabilities. This communication device can be a complete unit, or it can be a chip, processing system, or module installed within a complete unit. Devices with these chips, processing systems, or modules installed can implement the methods and functions of the embodiments of this application under the control of these chips, processing systems, or modules. Multilink devices can implement wireless communication by conforming to the 802.11 series of protocols, thereby enabling communication with other devices. Other devices shown herein may or may not be multilink devices. The operating frequency bands of multilink devices may include, but are not limited to, sub-1GHz, 2.4GHz, 5GHz, 6GHz, etc., and will not be listed here.

[0113] This application describes the method provided by the first communication device and the second communication device from both sides. However, during the transmission of signals, the first communication device and the second communication device can also forward the signals through other devices, such as forwarding the signals between the first communication device and the second communication device through a forwarding device. This application does not limit other devices besides the first communication device and the second communication device.

[0114] The following describes the terms or nouns used in the embodiments of this application.

[0115] 1. Subcarrier planning (toneplan) based on resource unit (RU)

[0116] As an example, when the bandwidth is 20MHz, the entire bandwidth (i.e., 20MHz) can consist of a single 242-tone RU, or it can consist of various combinations of 26-tone RUs, 52-tone RUs, and 106-tone RUs.

[0117] Figure 2a is a schematic diagram of the subcarrier distribution and RU distribution of 20MHz provided in an embodiment of this application. As shown in Figure 2a, 20MHz may include nine 26-tone RUs, or four 52-tone RUs, or two 106-tone RUs, or one 242-tone RU.

[0118] A 26-tone RU is an RU comprising 26 subcarriers, a 52-tone RU is an RU comprising 52 subcarriers, a 106-tone RU is an RU comprising 106 subcarriers, a 242-tone RU is an RU comprising 242 subcarriers, and so on. Each RU may include data subcarriers and pilot subcarriers. For example, the data subcarriers may be used to carry data information, and the pilot subcarriers may be used for phase offset and / or frequency offset estimation, etc. In addition to RUs, the aforementioned 20MHz bandwidth may also include at least one of the following: one or more guard subcarriers, one or more null subcarriers, and one or more direct current (DC) subcarriers. The subcarrier ranges included in each RU can be found in relevant standards or protocols, and will not be detailed here. The descriptions of RUs or subcarriers here also apply to other bandwidths shown below, and will not be repeated here. The descriptions of subcarriers here also apply to the descriptions of DRUs below, and will not be detailed here.

[0119] As another example, when the bandwidth is 40MHz, the entire bandwidth (i.e., 40MHz) can consist of a single 484-tone RU, or various combinations of 26-tone RUs, 52-tone RUs, 106-tone RUs, and 242-tone RUs. The entire bandwidth is roughly equivalent to a replication of a 20MHz subcarrier plan.

[0120] Figure 2b is a schematic diagram of the 40MHz subcarrier distribution and RU distribution provided in an embodiment of this application. As shown in Figure 2b, 40MHz may include 18 26-tone RUs, or 8 52-tone RUs, or 4 106-tone RUs, or 2 242-tone RUs, or 1 484-tone RU.

[0121] As another example, when the bandwidth is 80MHz, the entire bandwidth (i.e., 80MHz) can consist of a single 996-tone RU, or it can consist of various combinations of 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, and 484-tone RUs.

[0122] Figure 2c is a schematic diagram of the subcarrier distribution and RU distribution of 80MHz provided in an embodiment of this application. As shown in Figure 2c, 80MHz may include 36 26-tone RUs, or 16 52-tone RUs, or 8 106-tone RUs, or 4 242-tone RUs, or 2 484-tone RUs, or 1 996-tone RU. 484L and 484R represent the left and right halves of a 484-tone RU, respectively, each containing 242 subcarriers, and are another representation of 484+5DC. For example, if the subcarrier range of a 484-tone RU is [-500:-12], "484L" is the low-frequency portion relative to the frequency center of the 484-tone RU, i.e., [-500:-259], and "484R" is the high-frequency portion relative to the frequency center of the 484-tone RU, i.e., [-253:-12]. Similarly, taking the subcarrier range of a 484-tone RU as an example ([12:500]), "484L" is [12:253], and "484R" is [259:500]. These will not be listed individually here.

[0123] In this application, [a:c] can refer to all integers from a to c (a and c are also integers), with a step size of 1. That is: a, (a+1), (a+2), (a+3), ..., c; this will not be elaborated further below. For example, [259:500] represents 259, 260, 261, 262, ..., 498, 499, 500. Another example is [-500:-259], which represents -500, -499, -498, -497, ..., -260, -259.

[0124] As another example, when the bandwidth is 160MHz, the entire bandwidth can be viewed as a replica of two 80MHz subcarrier distributions. For instance, the entire bandwidth can consist of a single 2*996-tone RU, or various combinations of 26-tone RUs, 52-tone RUs, 106-tone RUs, 242-tone RUs, 484-tone RUs, and 996-tone RUs. When the bandwidth is 320MHz, the entire bandwidth can be viewed as a replica of four 80MHz subcarrier distributions. These will not be listed further here.

[0125] In the various subcarrier plans described above, using a 242-tone RU (i.e., 20MHz) as the unit, the leftmost part of Figures 2a-2c can be the lowest frequency, and the rightmost part of Figures 2a-2c can be the highest frequency. From left to right, the 242-tone RUs can be numbered: the first (1st), the second (2... nd ), ..., the sixteenth (16) th Taking a bandwidth of 320MHz as an example, the data field in a radio frame can occupy a maximum of 16 242-tone RUs. That is to say, in the data field, there can be a maximum of 16 242-tone RUs corresponding to 16 20MHz channels in ascending order of frequency.

[0126] Generally, a single STA can be allocated multiple RUs, meaning multiple RUs can be combined and assigned to a single STA. Therefore, the 802.11be standard supports multiple resource units (MRUs). In other words, in addition to the types of RUs mentioned above, the 802.11be standard also includes several MRUs. For example, a 52-tone RU and a 26-tone RU together form a 52+26-tone MRU. Another example is a 106-tone RU and a 26-tone RU together forming a 106+26-tone MRU. Yet another example is a 996-tone RU and a 484-tone RU together forming a 996+484-tone MRU. Yet another example is two 996-tone RUs and one 484-tone RU together forming a 2*996+484-tone MRU. And yet another example is three 996-tone RUs together forming a 3*996-tone MRU. For example, three 996-tone RUs and one 484-tone RU together form a 3*996+484-tone MRU. The symbol “*” in this application means “multiplied” or “multiplied by”.

[0127] In terms of bandwidth, when the subcarrier spacing is 78.125 kHz, a 26-tone RU corresponds to approximately 2 MHz (i.e., 26 * 78.125 kHz = 2031.25 kHz ≈ 2 MHz), a 52-tone RU corresponds to approximately 4 MHz, a 106-tone RU corresponds to approximately 8 MHz, and a 242-tone RU corresponds to approximately 20 MHz. The dimensions of other RUs can be deduced by addition or multiplication, which will not be elaborated upon in this application.

[0128] The aforementioned RU can be called a regular RU (rRU). Compared to a distributed RU, a regular RU has smaller bandwidth and lower transmission power. The term "lower" here is relative to a distributed RU; for example, the transmission power of a distributed RU can be further increased compared to a regular RU.

[0129] 2. Uplink multi-user transmission

[0130] Uplink multi-user transmission is an important technology.

[0131] Figure 3a is a schematic diagram of the uplink multi-user transmission process provided in an embodiment of this application. As shown in Figure 3a, the uplink multi-user transmission process may include: the AP sending a trigger frame to trigger uplink multi-user transmission, the trigger frame carrying identifier information and resource allocation information of one or more stations; after receiving the trigger frame, each station uses a trigger-based physical layer protocol data unit (TB PPDU) to send an uplink data frame on the allocated resource unit (RU), and receives an acknowledgment (BA) frame sent by the AP after a predetermined time (such as short inter-frame space (SIFS)).

[0132] In one possible implementation, the trigger frame may include, but is not limited to, a common information field and a user information list field. The common information field may contain common information that all STAs scheduled by the trigger frame need to read. In 802.11be, the user information list field of the trigger frame may include, but is not limited to, one or more EHT variant user Info fields. An EHT variant user Info field may contain information that an EHT STA needs to read.

[0133] Figure 3b is a schematic diagram of the frame format of the EHT variant user information field provided in an embodiment of this application. As shown in Figure 3b, the EHT variant user information field includes, but is not limited to, the Resource Unit Allocation subfield and the Master-Slave 160 subfield. Figure 3b uses EHT as an example. As the standard progresses, UHR variant user information fields may also appear later. The specific format of the UHR variant user information field is not limited in this embodiment. For example, the format of the UHR variant user information field may be the same as that of the EHT variant user information field. Of course, this application is not limited to this.

[0134] Generally, the RU or MRU assigned by the STA can be indicated by the following subfields: Resource Unit Allocation subfield, Master-Slave 160 subfield, Uplink Bandwidth subfield in the Common Information field, or Uplink Bandwidth Extension subfield in the Special User Information field. In the Common Information field, B55 indicates whether a Special User Information field exists in the User Information field. For EHT TB PPDUs, the bandwidth is jointly determined by the UL BW subfield and the UL BW Extension subfield in the Special User Information field.

[0135] The B0 bit in the RU allocation subfield, bits B7 to B1 in the RU allocation subfield, the PS160 subfield, and the mapping relationship between RU and MRU are shown in Table 1 below. The bandwidth is determined jointly by the UL BW subfield and the UL BW extension subfield. Table 1 illustrates the interpretation of the RU allocation subfield and PS160 subfield in the 802.11be trigger frame.

[0136] Table 1

[0137] 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 found in Table 2 below, which shows a lookup table for X1 and N.

[0138] Table 2

[0139] In Table 2 above, P80 represents the primary 80MHz channel, S80 represents the secondary 80MHz channel, and S160 represents the secondary 160MHz channel.

[0140] In Table 2 above, the configuration refers to the order of P80, S80, and S160 in absolute frequencies, from left to right representing low to high frequencies. 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, [P80 S80] indicates that the primary 80MHz channel is a low 80MHz channel, and the secondary 80MHz channel is a high 80MHz channel. As another example, [S80 P80 S160] indicates that the secondary 80MHz channel is a low 80MHz channel within a low 160MHz channel, the primary 80MHz channel is a high 80MHz channel within a low 160MHz channel, and the secondary 160MHz channel is a high 160MHz channel.

[0141] Tables 1 and 2 are examples of continuous RUs. For DRUs, the contents shown in Tables 1 and 2 may also apply, or other tables may be used for DRUs. This application does not limit this.

[0142] 3. Distributed Resource Unit (DRU)

[0143] Recently, a US telecommunications commission issued regulations regarding the 6GHz spectrum, defining a low-power indoor (LPI) communication method with strict limits on maximum transmit power and maximum frequency spectral density. For example, for a station (STA), the maximum power is 24 dBm, and the maximum power spectral density is -1 dBm / MHz. The transmit power of a device is limited by both the maximum power and the maximum power spectral density; firstly, the transmit power cannot exceed the maximum power value, and secondly, the transmit power spectral density cannot exceed the maximum power spectral density. Compared to maximum power, the limitation on maximum power spectral density is more stringent, and the maximum transmit power is usually more constrained by the power spectral density. For a station, the maximum power limit stipulated by the regulations is only reached when the bandwidth is at its maximum of 320 MHz. Below this bandwidth, due to the limitation on maximum power spectral density, only lower power can be transmitted. On June 30, 2021, Europe also issued regulations for the 6GHz spectrum, targeting LPI communication methods, such as a maximum power of 23 dBm and a maximum power spectral density of 10 dBm / MHz. When the bandwidth does not exceed 20MHz, the transmission power of the AP / STA is mainly limited by the power spectral density, while when the bandwidth is greater than 20MHz, the transmission power of the AP / STA is mainly limited by the maximum power.

[0144] Due to the limited power spectral density, distributing a finite number of subcarriers across a wider bandwidth (i.e., more subcarriers) can increase transmission power; this is known as a discrete RU (or distributed RU). It is commonly used in uplink multi-user transmissions, where multiple users interleave transmissions through discrete RUs to increase the transmission power of each user within a given bandwidth. It's important to note that the maximum power spectral density is limited in the form of a maximum transmission power of x mW per 1 MHz. Considering a carrier spacing of 78.125 kHz, 1 MHz contains 12.8 (approximately 13) subcarriers. Since the average power of each subcarrier is the same during a single transmission, observing any consecutive 13 subcarriers, the maximum number of subcarriers carrying the signal determines the average power of each subcarrier, and thus the transmission power of the signal. For example, with a 20 MHz bandwidth (242 subcarriers), a maximum of 5 subcarriers carrying the signal will be included in any consecutive 13 subcarriers; therefore, the average power of each subcarrier will be x(mW) / 5. Considering there are 26 subcarriers carrying the signal, the total transmission power will be x(mw) / 5*26.

[0145] The meta-DRU in this application includes multiple subcarriers discrete in the frequency domain, or multiple subcarriers discrete indices (or index values), or multiple subcarriers with discontinuous indices. These discrete subcarriers can be partially discrete or completely discrete. For example, the discrete subcarriers may include some subcarriers that are frequency-continuous, and some subcarriers that are frequency-discontinuous. Alternatively, the discrete subcarriers may be completely frequency-discontinuous. The phrase "frequency-continuous" can also be interpreted as "the indices of the subcarriers are continuous," and "frequency-discontinuous" can also be interpreted as "the indices of the subcarriers are discontinuous." In this application, "distributed RU" and "DRU" or "discrete RU" can be used interchangeably. It should also be understood that the DRU mentioned in this application refers to an RU with discrete subcarriers in the frequency domain. That is, an RU with this characteristic is referred to as a distributed RU or discrete RU in this application, but in practice, an RU with this characteristic may have other names, which this application does not limit.

[0146] In this application, a continuous RU refers to an RU consisting of multiple consecutive subcarriers, or a continuous RU consisting of two groups of consecutive subcarriers, where each group of consecutive subcarriers includes multiple consecutive subcarriers, and the two groups of consecutive subcarriers are separated only by guard subcarriers, empty subcarriers, or DC subcarriers. Of course, a continuous RU can also have other names, such as a regular RU (rRU). "Continuous RU" and "regular RU" can be used interchangeably, and this application does not limit the name of the continuous RU.

[0147] The following describes the method provided in the embodiments of this application.

[0148] Figure 4 is a flowchart illustrating the communication method provided in an embodiment of this application. The descriptions of the first and second communication devices involved in Figure 4 can be found above and will not be detailed here. As shown in Figure 4, the method includes:

[0149] 401. The first communication device generates OFDM symbols according to the subcarrier planning corresponding to the transmission bandwidth, and the pilot subcarriers in the subcarrier planning corresponding to the transmission bandwidth are shown in the specific embodiment.

[0150] The first communication device generates OFDM symbols based on the size (or dimensions) and location of the target DRU. The target DRU can be a DRU in the subcarrier planning corresponding to the transmission bandwidth. Specific steps for generating OFDM symbols can be found in relevant standards or protocols or Figure 5a below, and will not be detailed here.

[0151] 402. The first communication device transmits OFDM symbols. Correspondingly, the second communication device receives the OFDM symbols.

[0152] For example, the transmission processes in steps 401 and 402 can also be combined into: the first communication device can transmit OFDM symbols based on the transmission bandwidth, the size of the target DRU, and the location of the target DRU, where the target DRU can be located within the transmission bandwidth. Correspondingly, the receiving processes in step 402 and step 403 can also be combined into: the second communication device can receive OFDM symbols based on the transmission bandwidth, the size of the target DRU, and the location of the target DRU. The first communication device can carry pilot signals at the locations of the pilot subcarriers (i.e., at the indices of the various pilot subcarriers shown below). The second communication device can receive pilot signals at the locations of the pilot subcarriers (as shown below) and perform channel estimation, etc.

[0153] The embodiments of this application do not limit the method by which the first communication device or the second communication device learns about the target DRU.

[0154] As an example, the first communication device can be a station. Upon receiving a trigger frame from the AP, the first communication device can determine the target DRU assigned to it from the trigger frame. The trigger frame can be used to indicate one or more stations being scheduled uplink, and the corresponding DRUs for those stations. For a description of the trigger frame, please refer to the above descriptions of uplink multi-user transmission or the 802.11 standard, etc., which will not be elaborated upon here.

[0155] As another example, the first communication device can be an access point (AP). The AP can send OFDM symbols to the site from the DRU corresponding to the site. During downlink transmission, the allocation information of the DRU corresponding to the site can be indicated in a specific signaling (SIG) field (such as the UHR-SIG field or IMW-SIG field in the downlink PPDU). When the method provided in this application is applied to downlink transmission, it can increase the frequency domain diversity gain of downlink transmission, thereby improving transmission performance.

[0156] Figure 5a is a schematic diagram of the process of the first communication device generating OFDM symbols according to an embodiment of this application. As shown in Figure 5a, the process of the first communication device generating OFDM symbols can be as follows:

[0157] Information bits can be processed through scrambling (or scrambler as shown in Figure 5a), LDPC encoding (or encoder as shown in Figure 5a), stream parsing (or stream parser as shown in Figure 5a), constellation mapping (or constellation mapper as shown in Figure 5a), LDPC subcarrier mapping (or LDPC tone mapper as shown in Figure 5a), stream cyclic shift (CSD per SS), spatial and frequency mapping, etc., to form a frequency domain signal. Then, it undergoes IDFT to form a time domain signal, and then OFDM symbols are formed by inserting a cyclic prefix and windowing (insertGI and window), which are then transmitted through analog and radio frequency (RF) circuits. Multiple OFDM symbols can constitute a PPDU. Optionally, before forward error correction (FEC) coding (pre-FEC as shown in Figure 5a), the first communication device can also perform PHY padding. Optionally, after FEC (post-FEC as shown in Figure 5a), the first communication device can also perform PHY padding.

[0158] For example, the first communication device may perform space-frequency mapping processing based on the indexes of pilot subcarriers and data subcarriers. This space-frequency mapping processing includes subcarrier mapping as described below.

[0159] 403. The second communication device parses OFDM symbols.

[0160] Figure 5b is a schematic diagram of the process of the second communication device parsing OFDM symbols according to an embodiment of this application. As shown in Figure 5b, the process of the second communication device parsing OFDM symbols can be as follows:

[0161] For OFDM symbols, the signal can first be received through analog and radio frequency circuits, converted into a digital baseband signal, and then the cyclic prefix is ​​removed. Then, the frequency domain signal is obtained through DFT. The pilot signal is then processed to correct the phase offset and / or frequency offset. Channel effects are removed through channel estimation and equalization. Finally, the source information bits are recovered through operations such as demapping (or decapper as shown in Figure 5b), deconstellation point mapping (also known as deconstellation or constellation demapper as shown in Figure 5b), channel decoding (LDPC decoding or deencoder as shown in Figure 5b), and descrambling (or descrambler as shown in Figure 5b).

[0162] It should be understood that the processes shown in Figures 5a and 5b are merely examples. The steps for the first communication device to generate OFDM symbols may have more or fewer steps, and the steps for the second communication device to parse OFDM symbols may have more or fewer steps. This application does not limit these steps.

[0163] The subcarrier planning corresponding to the transmission bandwidth involved in Figure 4 can be referred to below, and will not be detailed here.

[0164] For the physical layer, multiple OFDM symbols can form a Physical Layer Convergence Procedure (PLCP) Protocol Data Unit (PPDU). Therefore, based on the relationship between OFDM symbols and PPDUs, the OFDM symbols in steps 401 to 403 can also be understood as PPDUs. For details on the relationship between OFDM symbols and PPDUs, please refer to the 802.11 standard or Figure 5a, etc., which will not be elaborated here.

[0165] In this embodiment, the pilot subcarriers in the subcarrier planning corresponding to the transmission bandwidth are designed in detail. By designing the relationship between the pilot subcarriers of the first DRU and the pilot subcarriers of the second DRU, the designed pilot subcarriers can minimize the types of different DRUs in the subcarrier planning corresponding to the transmission bandwidth, thereby reducing the implementation complexity of subcarrier mapping and demapping. Typically, a subcarrier mapper and demapping device needs to be designed for each type of DRU; therefore, the more types of DRUs there are, the higher the implementation complexity of subcarrier mapping and demapping. However, the method provided in this embodiment can minimize the types of different DRUs.

[0166] Furthermore, since the LTF sequence is designed based on each DRU individually, minimizing the number of DRU types simplifies the design complexity of the LTF sequence. Typically, the LTF sequence requires optimization for each DRU, so too many DRU types increase the design complexity. However, the method provided in this application minimizes the number of different DRU types.

[0167] The following details the subcarrier planning corresponding to the transmission bandwidth involved in the embodiments of this application.

[0168] Generally, a subcarrier index range can be used to represent the position of a subcarrier in the frequency domain within the subcarrier planning corresponding to the transmission bandwidth. For the index range, the middle index can be 0, the right side of 0 can be +1, and the left side of 0 can be -1. The number of subcarriers included to the left of 0 (which can also be understood as the index range) and the number of subcarriers included to the right of 0 can be determined by the total number of subcarriers. When the total number of subcarriers is an odd number greater than 1, the number of subcarriers included to the left of 0 and the number of subcarriers included to the right of 0 can be the same. When the total number of subcarriers is an even number greater than 2, the number of subcarriers included to the left of 0 and the number of subcarriers included to the right of 0 will be different. Generally, the number of subcarriers included to the right of 0 can be less than the number of subcarriers included to the left of 0. However, this application is not limited to this.

[0169] In this embodiment, the portion to the right of 0, or the part where the subcarrier index is greater than 0, can be referred to as the upper half-band (or upper half-frequency) of the transmission bandwidth. The portion to the left of 0, or the portion where the subcarrier index is less than 0, can be referred to as the lower half-band (or lower half-frequency) of the transmission bandwidth. For ease of description, the upper and lower half-bands will be used as examples in the following description.

[0170] The index range involved in the subcarrier planning corresponding to the transmission bandwidth can be determined based on the transmission bandwidth and subcarrier spacing.

[0171] Taking a subcarrier spacing of 78.125 kHz as an example, 20 MHz can have 256 subcarriers (i.e., 20 MHz / 78.125 kHz = 256). Assuming the number of subcarriers to the left of 0 is greater than the number of subcarriers to the right of 0, the index range of these 256 subcarriers can be [-128:127]. Alternatively, in ascending order of frequency (i.e., ascending order of index), the index of these 256 subcarriers can be [-128:127].

[0172] Taking a subcarrier spacing of 78.125 kHz as an example, 40 MHz can have 512 (40 MHz / 78.125 kHz = 512) subcarriers. Assuming the number of subcarriers to the left of 0 is greater than the number of subcarriers to the right of 0, the index range of these 512 subcarriers can be [-256:255]. Alternatively, in ascending order of frequency (i.e., ascending order of index), the index of these 256 subcarriers can be [-256:255].

[0173] Taking a subcarrier spacing of 78.125 kHz as an example, 80 MHz can have 1024 (i.e., 80 MHz / 78.125 kHz = 1024) subcarriers. Assuming the number of subcarriers to the left of 0 is greater than the number of subcarriers to the right of 0, the index range of these 1024 subcarriers can be [-512:511]. Alternatively, in ascending order of frequency (i.e., from smallest to largest index), the index of these 1024 subcarriers can be [-512:511]. The total number of subcarriers and their index ranges corresponding to other bandwidths will not be listed here.

[0174] Of course, as standards evolve, the subcarrier spacing may change. When the subcarrier spacing changes, the number of subcarriers and the subcarrier index of each DRU in this application may also change. Regardless of how the subcarrier spacing changes, as long as the method for determining the index of each DRU or the characteristics satisfied by each DRU are the same as those described below, they are all within the protection scope of the embodiments of this application.

[0175] The transmission bandwidth in the embodiments of this application can be a continuous bandwidth or a combined bandwidth. For example, 40MHz can be a combination of two 20MHz, or 80MHz can be a combination of one 40MHz and two 20MHz, or a combination of four 20MHz, etc.

[0176] In this application embodiment, DRUs of different sizes can satisfy:

[0177] A 484-tone DRU can comprise two 242-tone DRUs (i.e., 242 * 2 = 484). Alternatively, a 484-tone DRU can be split into two 242-tone DRUs. Or, two 242-tone DRUs can be combined into a single 484-tone DRU. The relationships between other DRU sizes (such as 996-tone DRUs) and 484-tone DRUs are not detailed here.

[0178] A 242-tone DRU can include two 106-tone DRUs. Optionally, a 242-tone DRU can also include a 26-tone DRU (i.e., 106*2+26<242). Alternatively, a 242-tone DRU can be split into two 106-tone DRUs and one 26-tone DRU. Or, two 106-tone DRUs and one 26-tone DRU can be combined into a single 242-tone DRU.

[0179] A 106-tone DRU can be comprised of two 52-tone DRUs (52*2<106). Alternatively, a 106-tone DRU can be split into two 52-tone DRUs. Or, two 52-tone DRUs can be merged into a 106-tone DRU.

[0180] A 52-tone DRU can be comprised of two 26-tone DRUs (26*2=52). Alternatively, a 52-tone DRU can be split into two 26-tone DRUs. Or, two 26-tone DRUs can be combined into a 52-tone DRU.

[0181] The aforementioned 26-tone DRU includes 26 subcarriers, 52-tone DRU includes 52 subcarriers, 106-tone DRU includes 106 subcarriers, 242-tone DRU includes 242 subcarriers, 484-tone DRU includes 484 subcarriers, and 996-tone DRU includes 996 subcarriers.

[0182] The implementation method described below uses a transmission bandwidth of 20MHz as an example; implementation methods two and three use a transmission bandwidth of 40MHz as an example; and implementation methods four and five use a transmission bandwidth of 80MHz as an example. The subcarrier planning for different bandwidths is explained in detail below.

[0183] Implementation Method 1

[0184] With a transmission bandwidth of 20MHz, the corresponding subcarrier planning can include nine 26-tone DRUs, four 52-tone DRUs, or two 106-tone DRUs. When the transmission bandwidth is 20MHz, the target DRU can be one of the nine 26-tone DRUs, one of the four 52-tone DRUs, or one of the two 106-tone DRUs. Alternatively, the target DRU can be a combination of two or three of the 26-tone, 52-tone, or 106-tone DRUs.

[0185] 1A, 26-tone DRU

[0186] The aforementioned nine 26-tone DRUs may include: 26-tone DRU 1, 26-tone DRU 2, 26-tone DRU 3, 26-tone DRU 4, 26-tone DRU 5, 26-tone DRU 6, 26-tone DRU 7, 26-tone DRU 8, or 26-tone DRU 9. These nine 26-tone DRUs can be distributed within the upper half-band and lower half-band, respectively. To facilitate differentiation between different DRUs, this application uses different numbering to distinguish them. The numbering of each DRU shown in this application is merely illustrative and does not constitute a limitation on this application.

[0187] Each of the nine 26-tone DRUs mentioned above may include one or more pilot subcarriers and multiple data subcarriers. For example, each 26-tone DRU may include two pilot subcarriers and 24 data subcarriers. In the various implementations described below, each 26-tone DRU with two pilot subcarriers will be used as an example.

[0188] Among the above nine 26-tone DRUs, at least two 26-tone DRUs (the first DRU and the second DRU shown below) satisfy at least one of the following (1) to (6):

[0189] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0190] The relative positions of the pilot subcarriers of the first DRU within the first DRU are symmetrical to the relative positions of the pilot subcarriers of the second DRU within the second DRU. This can be expressed as follows: in ascending frequency order, the X1st and X2th subcarriers of the first DRU are pilot subcarriers; similarly, in descending frequency order, the X1st and X2th subcarriers of the second DRU are also pilot subcarriers. Here, X1 and X2 are distinct integers. In this embodiment, "symmetry" refers to the relationship between the first and second DRUs. Whether the first and second DRUs are adjacent in number is not limited in this embodiment. The first and second DRUs can be understood as two different 26-tone DRUs among nine 26-tone DRUs.

[0191] Taking the subcarrier index range introduced above as an example, the order of frequency from low to high can also be understood as the order of subcarrier index from small to large, and the order of frequency from high to low can also be understood as the order of subcarrier index from large to small.

[0192] In ascending frequency order, the two pilot subcarriers in the first DRU are located at the X1st and X2nd subcarriers out of the 26 subcarriers in the first DRU, respectively. Similarly, in descending frequency order, the two pilot subcarriers in the second DRU are located at the X1st and X2nd subcarriers out of the 26 subcarriers in the second DRU, respectively. In other words, the subcarriers in the first DRU are in ascending index order, and the subcarriers in the second DRU are in descending index order (i.e., the order of the subcarriers in the first and second DRUs is different). The relative positions of the pilot subcarriers in the first DRU are the same as those in the second DRU.

[0193] Figure 6a is a symmetrical schematic diagram provided by an embodiment of this application. The DRU shown on the left in Figure 6a can be a first DRU, and the DRU shown on the right is a second DRU. For example, following the ascending index order (as shown in Figure 6a), the 11th and 24th subcarriers in the first DRU are pilot subcarriers. For the second DRU, following the descending index order, the 11th and 24th subcarriers in the second DRU are also pilot subcarriers. For the second DRU, if the index is still followed in ascending order (as shown in Figure 6a), then 3 subcarriers (corresponding to the aforementioned 24th subcarrier) and 16th subcarrier (corresponding to the aforementioned 11th subcarrier) in the second DRU are pilot subcarriers. As can be seen from Figure 6a, the relative position of the 24th subcarrier in the first DRU is symmetrical to the relative position of the 3rd subcarrier in the second DRU. The relative position of the 11th subcarrier in the first DRU is symmetrical to the relative position of the 16th subcarrier in the second DRU.

[0194] In this embodiment, the index of the pilot subcarrier can also be represented by the absolute position of the pilot subcarrier, or in other words, the position of the pilot subcarrier within the subcarrier index range corresponding to the transmission bandwidth. For example, the absolute position of the pilot subcarrier can be represented by an index. The relative position of the pilot subcarrier can represent the position of the pilot subcarrier relative to other pilot subcarriers, or the position of the pilot subcarrier within a certain DRU, etc. The explanations regarding absolute and relative positions here also apply to other implementations, and will not be repeated below.

[0195] Figure 6b is a schematic diagram of the relative and absolute positions provided in an embodiment of this application. As shown in Figure 6b, the absolute position refers to the position of each subcarrier in the DRU. That is, the index of each subcarrier in the DRU refers to the subcarrier index of the DRU within the frequency range corresponding to the transmission bandwidth. As shown in Figure 6b, the index of the 1st subcarrier in the DRU is -120, the index of the 11th subcarrier is -30, and the index of the 24th subcarrier is 96.

[0196] Among the above nine 26-tone DRUs, there may be one first DRU and one second DRU satisfying (1) above. Alternatively, among the above nine 26-tone DRUs, there may be multiple first DRUs and multiple second DRUs satisfying (1) above. For example, among the above nine 26-tone DRUs, there may be a first DRU#1 and a second DRU#1 satisfying (1) above, as well as a first DRU#2 and a second DRU#2 satisfying (1) above, etc., which will not be listed here.

[0197] For example, the pilot subcarriers of 26-tone DRU 1 and 26-tone DRU 4 can satisfy the above (1), or the pilot subcarriers of 26-tone DRU 2 and 26-tone DRU 3 can satisfy the above (1), or the pilot subcarriers of 26-tone DRU 5 and 26-tone DRU 9 can satisfy the above (1), or the pilot subcarriers of 26-tone DRU 6 and 26-tone DRU 7 can satisfy the above (1).

[0198] In this embodiment, the relative positions of the pilot subcarriers of the first DRU and the second DRU are symmetrical, so that the first DRU and the second DRU are of the same type, thereby minimizing the types of different 26-tone DRUs and reducing the implementation complexity of subcarrier mapping and demapping.

[0199] In this embodiment, two DRUs of the same type can mean that the relative positions of the pilot subcarriers in these two DRUs are the same, and the relative positions of the data subcarriers in these two DRUs are the same; or, the relative positions of the pilot subcarriers in these two DRUs are symmetrical, and the relative positions of the data subcarriers in these two DRUs are symmetrical (including mirror symmetry). This description of "same type" also applies to other implementations, and will not be repeated below.

[0200] (2) The relative positions of pilot subcarriers with index greater than 0 in the first DRU are symmetrical to the relative positions of pilot subcarriers with index less than 0 in the first DRU.

[0201] For a 26-tone DRU, each 26-tone DRU has two pilot subcarriers, located in the upper and lower half-bands respectively. Among the nine 26-tone DRUs corresponding to 20MHz, there may be at least one 26-tone DRU in which the pilot subcarriers in the upper half-band are symmetrical to the pilot subcarriers in the lower half-band.

[0202] Figure 6c is a symmetrical schematic diagram provided in an embodiment of this application. As shown in Figure 6c, the 7th and 20th subcarriers in the DRU shown in Figure 6c are pilot subcarriers. These two pilot subcarriers can be considered symmetrical.

[0203] For the nine 26-tone DRUs distributed in the lower and upper half-bands, these nine 26-tone DRUs can include a total of 18 pilot subcarriers. The upper and lower half-bands can each have nine pilot subcarriers, such that the nine pilot subcarriers in the upper half-band are evenly distributed within that band, and the nine pilot subcarriers in the lower half-band are also evenly distributed within that band. Furthermore, these 18 pilot subcarriers can satisfy at least one of (3) to (5):

[0204] (3) The index of the 9 pilot subcarriers in the lower half-band is -(a+8*S):S:-a; the index of the 9 pilot subcarriers in the upper half-band is a:S:(a+8*S). a and S are both positive integers.

[0205] The pilot subcarrier of the first DRU may include one of the nine pilot subcarriers in the lower half-band and one of the nine pilot subcarriers in the upper half-band. The pilot subcarrier of the second DRU may include one of the nine pilot subcarriers in the lower half-band and one of the nine pilot subcarriers in the upper half-band.

[0206] 'a' represents the index of the first pilot subcarrier in the upper half-band, in ascending frequency order. '-a' represents the index of the last pilot subcarrier in the lower half-band, in ascending frequency order. 'S' represents the index difference between two adjacent pilot subcarriers.

[0207] In this embodiment, the pilot subcarriers are evenly distributed in the lower and upper half-bands, which effectively avoids the aggregation of pilot subcarriers within a small frequency range, thus affecting the accuracy of channel estimation and improving the accuracy of channel estimation. Furthermore, the nine pilot subcarriers in the lower half-band are symmetrically related to the nine subcarriers in the upper half-band, thereby minimizing the types of different DRUs in the subcarrier planning corresponding to the transmission bandwidth.

[0208] (4) For the nine 26-tone DRUs distributed in the upper half-band, the minimum value of 'a' can be determined by the maximum index among the indices of the first subcarrier of each of the nine 26-tone DRUs, and the maximum value of 'a+8*S' can be determined by the minimum index among the indices of the last subcarrier of each of the nine 26-tone DRUs. The first and last subcarriers shown here are relative to the order from low to high frequency.

[0209] In other words, for the upper half of the frequency band, the maximum index among the indices of the first subcarrier in each of the nine 26-tone DRUs can be used to determine the minimum value of 'a'. For the upper half of the frequency band, the minimum index among the indices of the last subcarrier in each of the nine 26-tone DRUs can be used to determine the maximum value of 'a+8*S'.

[0210] For example, in the upper half-band, the indices of the first subcarrier of each of the nine 26-tone DRUs are 6, 10, 8, 12, 5, 7, 11, 9, 4. The largest index among these nine indices is 12, so a can be greater than 12.

[0211] For example, in the upper half-band, the indices of the last subcarrier of each of the nine 26-tone DRUs are 114, 118, 116, 120, 113, 115, 119, 117, 112, so a+8*S can be less than 112.

[0212] In this embodiment, the minimum value of 'a' and the maximum value of 'a+8*S', by satisfying the above (3), can effectively prevent the pilot subcarrier from being located near the guard subcarrier or DC subcarrier, and avoid using the subcarrier with the largest or smallest index of the 26-tone DRU as the pilot subcarrier. Therefore, it can effectively improve the distortion of radio frequency devices and reduce energy leakage.

[0213] (5) The greatest common divisor of S and 9 is 1.

[0214] Considering that each 26-tone DRU has a pilot subcarrier in the lower or upper half of the frequency band, S and 9 can be prime numbers, that is, the greatest common divisor of S and 9 is 1.

[0215] Based on the above conditions, the following examples illustrate the values ​​of S and a.

[0216] As an example, if S = 11 and a = 19, then the index of the 18 pilot subcarriers can be [-107:11:-19, 19:11:107].

[0217] As another example, if S = 10 and a = 23, then the index of the 18 pilot subcarriers can be [-103:10:-23,23:10:103].

[0218] As another example, if S = 8 and a = 31, then the index of the 18 pilot subcarriers can be [-95:8:-31,31:10:95].

[0219] The values ​​of S and a will not be listed here.

[0220] In this embodiment of the application, S and 9 satisfy the above (5), so that each 26-toneDRU has a pilot subcarrier in the lower half frequency band and a pilot subcarrier in the upper half frequency band, thereby improving the diversity gain of the second communication device when performing phase offset estimation based on the pilot subcarrier.

[0221] (6) The indices of the 26 subcarriers of the first DRU and the indices of the 26 subcarriers of the second DRU can be opposites of each other.

[0222] For example, the index of the 26 subcarriers of the first DRU is [-120:9:-12,6:9:114], and the index of the 26 subcarriers of the second DRU is [-114:9:-6,12:9:120].

[0223] In this embodiment, [a:b:c] represents a data set starting from a and ending at c, with a step size of b. That is, [a:b:c] can represent the set [a, a+b, a+2b, a+3b, ..., c]. Whether the last value c can be obtained depends on whether ca is exactly an integer multiple of b. If not, then element c is not included. When b equals 1, [a:c] can usually be used to represent [a:1:c].

[0224] Optionally, the index of the pilot subcarrier of the first DRU and the index of the pilot subcarrier of the second DRU can be opposites of each other.

[0225] In this embodiment, by satisfying (1) to (4) above, the implementation complexity of the first communication device performing subcarrier mapping and the implementation complexity of the second communication device performing subcarrier mapping can be reduced as much as possible. Furthermore, the design of the DRU LTF sequence can be effectively simplified.

[0226] As one possible implementation, based on the determined index of each 26-tone DRU, pilot subcarriers are designed for each 26-tone DRU using the above (1) to (5).

[0227] As another possible implementation, based on satisfying (1) to (6) above, subcarriers can be designed for each 26-tone DRU, and two subcarriers can be selected as pilot subcarriers from the 26 subcarriers included in each 26-tone DRU.

[0228] For example, with a transmission bandwidth of 20MHz, the index range of the guard subcarrier in the lower half-band is [-128:-121], the index range of the DC subcarrier is [-1:1], and the index range of the guard subcarrier in the upper half-band is [121:127]. The index range of the data subcarrier and pilot subcarrier in the lower half-band can be [-120:-2], and the index range of the data subcarrier and pilot subcarrier in the upper half-band can be [2:120]. The index ranges of the data subcarrier and pilot subcarrier shown here are relative to the data subcarrier and pilot subcarrier in the subcarrier planning corresponding to the transmission bandwidth. For a DRU of a certain size, the above index ranges of the data subcarrier and pilot subcarrier can be different. For a 26-tone DRU, the index range for data subcarriers and pilot subcarriers in the lower half-band can be [-120:-4], while the index range for data subcarriers and pilot subcarriers in the upper half-band can be [4:120]. The index ranges for DRUs of different sizes are not listed here.

[0229] For example, the indexes of the above nine 26-tone DRUs can be as follows:

[0230] The index range of 26-tone DRU 1 can be [-120:9:-12,6:9:114];

[0231] The index range of 26-tone DRU 2 can be [-116:9:-8,10:9:118];

[0232] The index range of 26-tone DRU 3 can be [-118:9:-10,8:9:116];

[0233] The index range of 26-tone DRU 4 can be [-114:9:-6,12:9:120];

[0234] The index range of 26-tone DRU 5 can be [-112:9:-4,5:9:113];

[0235] The index range of 26-tone DRU 6 can be [-119:9:-11,7:9:115];

[0236] The index range of 26-tone DRU 7 can be [-115:9:-7,11:9:119];

[0237] The index range of a 26-tone DRU 8 can be [-117:9:-9,9:9:117];

[0238] The index range of 26-tone DRU 9 can be [-113:9:-5,4:9:112].

[0239] For each of the 26-tone DRU indices listed above, the pilot subcarriers can satisfy at least one of (1) to (5) above. If (1) to (5) above are satisfied, pilot subcarriers can be designed for each 26-tone DRU. Of course, the indices of the various DRUs listed above are merely examples and should not be construed as limiting the embodiments of this application.

[0240] As can be seen from the relative positions of the subcarriers of the various 26-tone DRUs listed above, without distinguishing the subcarrier type, 26-tone DRU 5 and 26-tone DRU 9 have the same structure. That is, by shifting one of the 26-tone DRUs, the other 26-tone DRU can be obtained. In other words, the subcarrier with the largest index in the lower half-band and the subcarrier with the smallest index in the upper half-band of these two 26-tone DRUs are separated by the same number of subcarriers. The structures of the other 26-tone DRUs besides 26-tone DRU 5 and 26-tone DRU 9 are the same.

[0241] In this embodiment, considering the position of the pilot subcarriers, the relative positions of the pilot subcarriers of 26-tone DRUs with the same structure can be symmetrical. For example, the relative position of the pilot subcarrier of 26-tone DRU 1 in 26-tone DRU 1 can be symmetrical with the relative position of the pilot subcarrier of 26-tone DRU 4 in 26-tone DRU 4 (that is, 26-tone DRU 1 and 26-tone DRU 4 belong to the same type). Similarly, the relative position of the pilot subcarrier of 26-tone DRU 2 in 26-tone DRU 2 can be symmetrical with the relative position of the pilot subcarrier of 26-tone DRU 3 in 26-tone DRU 3 (that is, 26-tone DRU 2 and 26-tone DRU 3 belong to the same type). For example, the relative positions of the pilot subcarriers of 26-tone DRU 5 within 26-tone DRU 5 and the relative positions of the pilot subcarriers of 26-tone DRU 9 within 26-tone DRU 9 can be symmetrical (i.e., 26-tone DRU 5 and 26-tone DRU 9 belong to the same type). Similarly, the relative positions of the pilot subcarriers of 26-tone DRU 6 within 26-tone DRU 6 and the relative positions of the pilot subcarriers of 26-tone DRU 7 within 26-tone DRU 7 can be symmetrical (i.e., 26-tone DRU 6 and 26-tone DRU 7 belong to the same type). In other words, the nine 26-tone DRUs have five types. For an explanation of the symmetrical relationships, please refer to (1) above; further details will not be provided here.

[0242] The pilot subcarriers of each 26-tone DRU will be described below in ascending order of frequency. The index range of the subcarriers of each 26-tone DRU shown below can be the same as the one above, or it can be any other index range not shown. The embodiments of this application do not limit the index range of the subcarriers of each 26-tone DRU.

[0243] In each of the 26-tone DRUs shown below, the subcarrier with the smallest index can be referred to as the first subcarrier (i.e., the starting position number shown below is 1). In this case, X1 shown above can be an integer greater than or equal to 1 and less than or equal to 26, and X2 can be an integer greater than or equal to 1 and less than or equal to 26. Of course, the aforementioned "first subcarrier" can also be replaced with "0th subcarrier" (in this case, X1 can be an integer greater than or equal to 0 and less than or equal to 25, and X2 can be an integer greater than or equal to 0 and less than or equal to 25), etc. As long as the sequence number of the subcarrier with the smallest index in each 26-tone DRU remains consistent, it falls within the protection scope of the embodiments of this application.

[0244] As an example 1, with S=11 and a=19, the relative positions and indices of the pilot subcarriers of each 26-tone DRU can be shown below:

[0245] In a 26-tone DRU 1, the 11th and 24th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 1 can be [-30, 96].

[0246] In a 26-tone DRU 2, the 2nd and 15th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 2 can be [-107, 19].

[0247] In a 26-tone DRU 3, the 12th and 25th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 3 can be [-19, 107].

[0248] In a 26-tone DRU 4, the 3rd and 16th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 4 can be [-96, 30].

[0249] In a 26-tone DRU 5, the 4th and 18th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 5 can be [-85, 41].

[0250] In a 26-tone DRU 6, the 6th and 19th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 6 can be [-74, 52].

[0251] In a 26-tone DRU 7, the 8th and 21st subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 7 can be [-52, 74].

[0252] In a 26-tone DRU 8, the 7th and 20th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 8 can be [-63, 63].

[0253] In a 26-tone DRU 9, the 9th and 23rd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 9 can be [-41, 85].

[0254] As another example 2, with S=10 and a=23, the relative positions and indices of the pilot subcarriers of each 26-tone DRU can be shown below:

[0255] In a 26-tone DRU 1, the 4th and 17th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 1 can be [-93, 33].

[0256] In a 26-tone DRU 2, the 8th and 21st subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 2 can be [-53, 73].

[0257] In a 26-tone DRU 3, the 6th and 19th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 3 can be [-73, 53].

[0258] In a 26-tone DRU 4, the 10th and 23rd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 4 can be [-33, 93].

[0259] In a 26-tone DRU 5, the 2nd and 16th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 5 can be [-103, 23].

[0260] In a 26-tone DRU 6, the 5th and 18th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 6 can be [-83, 43].

[0261] In a 26-tone DRU 7, the 9th and 22nd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 7 can be [-43, 83].

[0262] In a 26-tone DRU 8, the 7th and 20th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 8 can be [-63, 63].

[0263] In a 26-tone DRU 9, the 11th and 25th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 9 can be [-23, 103].

[0264] As another example 3, taking S=8 and a=31 as an example, the relative positions and indices of the pilot subcarriers of each 26-tone DRU can be shown as follows:

[0265] In a 26-tone DRU 1, the 10th and 23rd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 1 can be [-39, 87].

[0266] In a 26-tone DRU 2, the 6th and 19th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 2 can be [-71, 55].

[0267] In a 26-tone DRU 3, the 8th and 21st subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 3 can be [-55, 71].

[0268] In a 26-tone DRU 4, the 4th and 17th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 4 can be [-87, 39].

[0269] In a 26-tone DRU 5, the 10th and 24th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 5 can be [-31, 95].

[0270] In a 26-tone DRU 6, the 9th and 22nd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 6 can be [-47, 79].

[0271] In a 26-tone DRU 7, the 5th and 18th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 7 can be [-79, 47].

[0272] In a 26-tone DRU 8, the 7th and 20th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 8 can be [-63, 63].

[0273] In a 26-tone DRU 9, the 3rd and 17th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the index of the pilot subcarriers in a 26-tone DRU 9 can be [-95, 31].

[0274] The pilot subcarriers corresponding to the other values ​​of S and a for each 26-tone DRU are not listed here. This application does not limit the index of the pilot subcarriers corresponding to the relative positions of each DRU. The index of the pilot subcarriers can vary with the index range of each DRU.

[0275] In this embodiment, nine pilot subcarriers for 26-tone DRUs corresponding to 20MHz are designed. The 18 pilot subcarriers corresponding to these nine 26-tone DRUs can be evenly distributed within the 20MHz range. Furthermore, the relative positions of the pilot subcarriers of structurally identical 26-tone DRUs are symmetrical, allowing these nine 26-tone DRUs to have five different types. This minimizes the number of different types of the nine 26-tone DRUs, effectively reducing the complexity of subcarrier mapping and demapping. Since the LTF sequence is designed based on each DRU individually, ensuring the symmetrical relative positions of the pilot subcarriers of structurally identical 26-tone DRUs further simplifies the design complexity of the LTF sequence.

[0276] 1B, 52-tone DRU

[0277] 52-tone DRU 1, 52-tone DRU 2, 52-tone DRU 3, and 52-tone DRU 4 are distributed in the lower half-band and upper half-band, respectively.

[0278] Each of the aforementioned 52-tone DRUs can include multiple pilot subcarriers and multiple data subcarriers. For example, each 52-tone DRU can include 4 pilot subcarriers and 48 data subcarriers. In the various implementations described below, each 52-tone DRU with 4 pilot subcarriers will be used as an example for illustration.

[0279] Among the four 52-tone DRUs mentioned above, two 52-tone DRUs (such as the first DRU and the second DRU shown below) can satisfy the following:

[0280] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is the same as or symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0281] If we consider the X1, X2, X3, and X4 subcarriers in the first DRU as pilot subcarriers in ascending frequency order, and the X1, X2, X3, and X4 subcarriers in the second DRU as pilot subcarriers in descending frequency order, then X1, X2, X3, and X4 are pilot subcarriers. Here, X1, X2, X3, and X4 are distinct integers. The first and second DRUs can be understood as two different 52-tone DRUs out of four 52-tone DRUs.

[0282] For an explanation of the order of frequency from low to high (or index from small to large) and the order of frequency from high to low (or index from large to small), please refer to the description in 1A above, which will not be repeated here.

[0283] For four 52-tone DRUs distributed in the lower and upper half-bands, these four 52-tone DRUs can include a total of 16 pilot subcarriers. The upper and lower half-bands can each have 8 pilot subcarriers. The 8 pilot subcarriers in the lower half-band can be evenly distributed within the lower half-band, and the 8 pilot subcarriers in the upper half-band can be evenly distributed within the upper half-band. These 16 pilot subcarriers can also satisfy the following:

[0284] (2) The eight pilot subcarriers in the lower half-band are eight of the following nine pilot subcarriers: -(a+8*S):S:-a; the eight pilot subcarriers in the upper half-band are eight of the following nine pilot subcarriers: a:S:(a+8*S).

[0285] The pilot subcarriers of the first DRU may include two of the eight pilot subcarriers in the lower half-band and two of the eight pilot subcarriers in the upper half-band. The pilot subcarriers of the second DRU may include two of the eight pilot subcarriers in the lower half-band and two of the eight pilot subcarriers in the upper half-band.

[0286] Based on the description in 1A (2), the pilot subcarrier of the first DRU may include two of the following nine pilot subcarriers, the index of which can be a: S: (a+8*S); and two of the following nine pilot subcarriers, the index of which can be -(a+8*S): S: -a.

[0287] For the explanation of (2) in 1B, please refer to the descriptions of (3) to (5) in 1A, which will not be elaborated here.

[0288] (3) The indices of the 52 subcarriers of the first DRU and the indices of the 52 subcarriers of the second DRU are opposites of each other.

[0289] Optionally, the index of the pilot subcarrier of the first DRU and the index of the pilot subcarrier of the second DRU can be opposites of each other.

[0290] The explanation of (3) in 1B can be found in the description of (6) in 1A, and will not be elaborated here.

[0291] The conditions that the pilot subcarriers of a 52-tone DRU must meet can be found in the description of a 26-tone DRU in 1A, and will not be elaborated here.

[0292] As one possible implementation, based on the determined index of each 52-tone DRU, pilot subcarriers can be designed for each 52-tone DRU according to the above (1) to (2).

[0293] As another possible implementation, based on satisfying (1) to (3) above, subcarriers can be designed for each 52-tone DRU, and 4 subcarriers can be selected as pilot subcarriers from the 52 subcarriers included in each 52-tone DRU.

[0294] As another possible implementation, based on the 26-tone DRUs shown in 1A above, and considering the relationship between 26-tone DRUs and 52-tone DRUs (e.g., one 52-tone DRU can include two 26-tone DRUs), the pilot subcarriers of each 52-tone DRU can be designed. For example, 52-tone DRU 1 can include 26-tone DRU 1 and 26-tone DRU 2, and the four pilot subcarriers of 52-tone DRU 1 can be the four pilot subcarriers corresponding to 26-tone DRU 1 and 26-tone DRU 2. 52-tone DRU 2 can include 26-tone DRU 3 and 26-tone DRU 4, and the four pilot subcarriers of 52-tone DRU 2 can be the four pilot subcarriers corresponding to 26-tone DRU 3 and 26-tone DRU 4. A 52-tone DRU 3 may include 26-tone DRU 6 and 26-tone DRU 7, and the four pilot subcarriers of the 52-tone DRU 3 may be the four pilot subcarriers corresponding to 26-tone DRU 6 and 26-tone DRU 7. The four pilot subcarriers of the 52-tone DRU 4 may be the four pilot subcarriers corresponding to 26-tone DRU 8 and 26-tone DRU 9. The relationships between the various 26-tone DRUs and 52-tone DRUs listed herein are merely examples, and the numbering of the two 26-tone DRUs included in a 52-tone DRU is not limited in this embodiment.

[0295] As an example, with S=11 and a=19, the relative positions and indices of the pilot subcarriers of each 52-tone DRU can be shown below:

[0296] In a 52-tone DRU 1, the 4th, 21st, 30th, and 47th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 1 can be [-107, -30, 19, and 96].

[0297] In a 52-tone DRU 2, the 6th, 23rd, 32nd, and 49th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 2 can be [-96, -19, 30, and 107].

[0298] In a 52-tone DRU 3, the 11th, 16th, 37th, and 42nd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 3 can be [-74, -52, 52, and 74].

[0299] In a 52-tone DRU 4, the 13th, 18th, 40th, and 45th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 4 can be [-63, -41, 63, and 85].

[0300] As another example, with S=10 and a=23, the relative positions and indices of the pilot subcarriers of each 52-tone DRU can be shown below:

[0301] In a 52-tone DRU 1, the 7th, 16th, 33rd, and 42nd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 1 can be [-93, -53, 33, and 73].

[0302] In a 52-tone DRU 2, the 11th, 20th, 37th, and 46th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 2 can be [-73, -33, 53, and 93].

[0303] In a 52-tone DRU 3, the 9th, 18th, 35th, and 44th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 3 can be [-83, -43, 43, and 83].

[0304] In a 52-tone DRU 4, the 13th, 22nd, 40th, and 49th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 4 can be [-63, -23, 63, and 103].

[0305] As another example, with S=8 and a=31, the relative positions and indices of the pilot subcarriers of each 52-tone DRU can be shown below:

[0306] In a 52-tone DRU 1, the 12th, 19th, 38th, and 45th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 1 can be [-71, -39, 55, and 87].

[0307] In a 52-tone DRU 2, the 8th, 15th, 34th, and 41st subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 2 can be [-87, -55, 39, and 71].

[0308] In a 52-tone DRU 3, the 10th, 17th, 36th, and 43rd subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 3 can be [-79, -47, 47, and 79].

[0309] In a 52-tone DRU 4, the 6th, 13th, 33rd, and 40th subcarriers can be pilot subcarriers. Taking Table 3 as an example, the indices of the pilot subcarriers in a 52-tone DRU 4 can be [-95, -63, 31, and 63].

[0310] The pilot subcarriers of each 52-tone DRU corresponding to the other values ​​of S and a are not listed here.

[0311] 1C, 106-tone DRU

[0312] 106-tone DRU 1 and 106-tone DRU 2 are distributed in the lower half-band and upper half-band, respectively.

[0313] Each of the aforementioned 106-tone DRUs can include multiple pilot subcarriers and multiple data subcarriers. For example, each 106-tone DRU can include 4 pilot subcarriers and 102 data subcarriers. In the various implementations described below, each 106-tone DRU with 4 pilot subcarriers will be used as an example for illustration.

[0314] As one possible implementation, the pilot subcarriers of a 106-tone DRU can be designed in conjunction with the 26-tone DRU shown in 1A above. For example, a 106-tone DRU may include four 26-tone DRUs. Based on the relationship between the 26-tone DRU and the 106-tone DRU, four pilot subcarriers can be selected from the eight pilot subcarriers of the four 26-tone DRUs corresponding to a 106-tone DRU as the pilot subcarriers of that 106-tone DRU.

[0315] As another possible implementation, the pilot subcarriers of a 106-tone DRU can be designed in conjunction with the 52-tone DRU shown in 1B above. For example, a 106-tone DRU may include two 52-tone DRUs. Based on the relationship between the 52-tone DRU and the 106-tone DRU, four pilot subcarriers can be selected from the eight pilot subcarriers of the two 52-tone DRUs corresponding to a 106-tone DRU as the pilot subcarriers of that 106-tone DRU.

[0316] For example, a 106-tone DRU 1 may include a 52-tone DRU 1 (e.g., including 26-tone DRU 1 and 26-tone DRU 2) and a 52-tone DRU 2 (e.g., including 26-tone DRU 3 and 26-tone DRU 4), ​​where the four pilot subcarriers of the 106-tone DRU 1 may be four of the eight pilot subcarriers corresponding to the 52-tone DRU 1 and 52-tone DRU 2. Similarly, a 106-tone DRU 2 may include 52-tone DRU 3 and 52-tone DRU 4, where the four pilot subcarriers of the 106-tone DRU 2 may be four of the eight pilot subcarriers corresponding to the 52-tone DRU 3 and 52-tone DRU 4. Alternatively, four pilot subcarriers may be uniformly selected from the aforementioned eight pilot subcarriers as the pilot subcarriers of the 106-tone DRU. For example, four pilot subcarriers can be randomly selected from the above eight pilot subcarriers as pilot subcarriers for the 106-tone DRU. The specific selection method is not limited in this application. The relationship between the 52-tone DRU and the 26-tone DRU can be found in the description in 1B, and will not be detailed here. The index ranges for each 106-tone DRU can be found in Table 3, and will not be listed here. The conditions that the pilot subcarriers of the 106-tone DRU must meet can be found in the description of the 26-tone DRU in 1A, and will not be detailed here.

[0317] Table 3 illustrates, for example, the relationship between DRUs of different sizes at 20 MHz.

[0318] Table 3

[0319] In Table 3, 26-tone DRU 1 and 26-tone DRU 2 can be merged into 52-tone DRU 1, 26-tone DRU 3 and 26-tone DRU 4 can be merged into 52-tone DRU 2, and so on. 26-tone DRU 1 to 26-tone DRU 4 (i.e., 52-tone DRU 1 and 52-tone DRU 2) and [-3,3] can be merged into 106-tone DRU 1, 26-tone DRU 6 to 26-tone DRU 9 (i.e., 52-tone DRU 3 and 52-tone DRU 4) and [-2,2] can be merged into 106-tone DRU 2.

[0320] Taking Example 1 above as an example, the relative positions of the pilot subcarriers of each DRU corresponding to 20 MHz can be shown in Table 4:

[0321] Table 4

[0322] In Table 4, the pilot subcarriers of 52-tone DRU 1 are the pilot subcarriers included in 26-tone DRU 1 and 26-tone DRU 2. That is, the relative positions of the pilot subcarriers of 52-tone DRU 1 can be obtained by merging and sorting the subcarrier indices of 26-tone DRU 1 and 26-tone DRU 2, based on the relative positions of the pilot subcarriers of 26-tone DRU 1 and 26-tone DRU 2. The relative positions of the pilot subcarriers of 52-tone DRU 1 are not listed here. The same applies to 52-tone DRU 2 through 52-tone DRU 4, and will not be detailed here. The indexes of the pilot subcarriers of each 52-tone DRU in Table 4 can be found in the description in section 1B.

[0323] The pilot subcarriers of 106-tone DRU 1 can be four of the eight pilot subcarriers included in 52-tone DRU 1 and 52-tone DRU 2. The pilot subcarriers of 106-tone DRU 2 can be four of the eight pilot subcarriers included in 52-tone DRU 3 and 52-tone DRU 4. For example, the pilot subcarriers of 106-tone DRU 1 can be four of the following eight pilot subcarriers, with indices [-107, -96, -30, -19, 19, 30, 96, 107]. The pilot subcarriers of 106-tone DRU 2 can be four of the following eight pilot subcarriers, with indices [-74, -63, -52, -41, 52, 63, 74, 83].

[0324] For Table 4, the 7th, 41st, 61st, and 95th subcarriers in 106-tone DRU 1 are pilot subcarriers, with indices of [-107, -30, 19, 96] for example. Similarly, the 21st, 31st, 76th, and 86th subcarriers in 106-tone DRU 2 are pilot subcarriers, with indices of [-74, -52, 52, 74] for example.

[0325] In Table 4, for 26-tone DRU 1, 26-tone DRU 2, 26-tone DRU 3, 26-tone DRU 4, 26-tone DRU 6, 26-tone DRU 7, and 26-tone DRU 8, or for 26-tone DRU 5 and 26-tone DRU 9, the index difference between the two pilot subcarriers in these 26-tone DRUs is the same (or the distance between the relative positions of the pilot subcarriers is the same). This facilitates the implementation of the pilot estimation algorithm. The relative positions of pilot subcarriers in DRUs of the same size can be found in the tables shown in this application, which illustrate the relative positions of DRUs of the same size. The above description of 26-tone DRUs can also be applied to DRUs of other sizes.

[0326] The relative positions of the 106-tone DRUs shown in Table 4 are merely examples and should not be construed as limiting the embodiments of this application. The descriptions of Table 4 herein also apply to Tables 5 and 6, and will not be detailed further below.

[0327] Taking Example 2 above as an example, the relative positions of the pilot subcarriers of each DRU corresponding to 20MHz can be shown in Table 5:

[0328] Table 5

[0329] For example, the pilot subcarriers of a 106-tone DRU 1 can be four of the following eight pilot subcarriers, with indices of [-93, -73, -53, -33, 33, 53, 73, 93]. The pilot subcarriers of a 106-tone DRU 2 can be four of the following eight pilot subcarriers, with indices of [-83, -63, -43, -23, 43, 63, 83, 103].

[0330] For Table 5, the 13th, 31st, 67th, and 85th subcarriers in 106-tone DRU 1 are pilot subcarriers, with indices of [-93, -53, 33, 73] for example. Similarly, the 17th, 35th, 72nd, and 90th subcarriers in 106-tone DRU 2 are pilot subcarriers, with indices of [-83, -43, 43, 83] for example.

[0331] The indexes of pilot subcarriers for each 52-tone DRU in Table 5 can be found in the description in 1B.

[0332] Taking Example 3 above as an example, the relative positions of the pilot subcarriers of each DRU corresponding to 20MHz can be shown in Table 6:

[0333] Table 6

[0334] For example, the pilot subcarriers of a 106-tone DRU 1 can be four of the following eight pilot subcarriers, with indices of [-87, -71, -55, -39, 39, 55, 71, 87]. The pilot subcarriers of a 106-tone DRU 2 can be four of the following eight pilot subcarriers, with indices of [-95, -79, -63, -47, 31, 47, 63, 79].

[0335] For Table 6, the 23rd, 37th, 77th, and 91st subcarriers in 106-tone DRU 1 are pilot subcarriers, with indices of [-71, -39, 55, 87] for example. Similarly, the 19th, 33rd, 74th, and 88th subcarriers in 106-tone DRU 2 are pilot subcarriers, with indices of [-79, -47, 47, 79] for example.

[0336] The indexes of pilot subcarriers for each 52-tone DRU in Table 6 can be found in the description in 1B. Further explanations regarding Tables 5 and 6 can be found above and will not be elaborated upon here. For explanations of the beneficial effects of each implementation method below, please refer to Implementation Method 1; the beneficial effects of each condition will not be detailed further below.

[0337] In this embodiment, pilot subcarriers for each DRU are designed with a 20MHz bandwidth, ensuring that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 26-tone DRUs, 26-tone DRU 1 and 26-tone DRU 4 belong to the same type, 26-tone DRU 2 and 26-tone DRU 3 belong to the same type, 26-tone DRU 5 and 26-tone DRU 9 belong to the same type, and 26-tone DRU 6 and 26-tone DRU 7 belong to the same type. For 52-tone DRUs, 52-tone DRU 1 and 52-tone DRU 2 can belong to the same type. This reduces the complexity of subcarrier mapping and demapping, while simplifying the design of the DRU LTF sequence.

[0338] Implementation Method Two

[0339] With a transmission bandwidth of 40MHz, the subcarrier planning corresponding to this bandwidth can include 18 26-tone DRUs, 8 52-tone DRUs, 4 106-tone DRUs, or 2 242-tone DRUs. When the transmission bandwidth is 40MHz, the target DRU can be one of the 18 26-tone DRUs, one of the 8 52-tone DRUs, one of the 4 106-tone DRUs, or one of the 2 242-tone DRUs. Alternatively, the target DRU can also be a combination of two or more DRUs selected from the 26-tone, 52-tone, 106-tone, or 242-tone DRU categories.

[0340] 2A, 26-tone DRU

[0341] The aforementioned 18 26-tone DRUs can include: 26-tone DRU 1 to 26-tone DRU 18. These 18 26-tone DRUs can be distributed in the lower half-band and the upper half-band, respectively.

[0342] The aforementioned 18 26-tone DRUs may contain two 26-tone DRUs (as shown below, the first DRU and the second DRU) that satisfy at least one of the following (1) to (6):

[0343] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is the same as or symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0344] The relative positions of the pilot subcarriers in the first DRU within the first DRU are the same as the relative positions of the pilot subcarriers in the second DRU within the second DRU. This can be expressed as follows: in ascending frequency order, the X1-th and X2-th subcarriers in the first DRU are pilot subcarriers; similarly, in ascending frequency order, the X1-th and X2-th subcarriers in the second DRU are also pilot subcarriers. Here, X1 and X2 are distinct integers.

[0345] Among the aforementioned 18 26-tone DRUs, there may be one first DRU and one second DRU satisfying (1) above. Alternatively, among the aforementioned 18 26-tone DRUs, there may be multiple first DRUs and multiple second DRUs satisfying (1) above. For example, in ascending frequency order, the 5th and 18th subcarriers in 26-tone DRU 1 are pilot subcarriers. In descending frequency order, the 5th and 18th subcarriers in 26-tone DRU 18 are also pilot subcarriers. For 26-tone DRU 18, if still in ascending frequency order, the 22nd subcarrier (corresponding to the aforementioned 5th subcarrier) and the 9th subcarrier (corresponding to the aforementioned 18th subcarrier) in 26-tone DRU 18 are pilot subcarriers. Optionally, in ascending frequency order, the 9th and 22nd subcarriers in 26-tone DRU 12 are pilot subcarriers. Examples of first DRU and second DRU are not listed here.

[0346] For an explanation of (1) in 2A, please refer to the description of (1) in 1A above. It will not be elaborated here.

[0347] For the 18 26-tone DRUs distributed in the lower and upper half-bands, these 18 26-tone DRUs comprise a total of 36 pilot subcarriers. The upper and lower half-bands can each have 18 pilot subcarriers, such that the 18 pilot subcarriers in the lower half-band are evenly distributed within it, and the 18 pilot subcarriers in the upper half-band are also evenly distributed within it. Furthermore, these 36 pilot subcarriers must satisfy at least one of (2) to (5):

[0348] (2) The index of the 18 pilot subcarriers in the lower half-band is -(b+17*S):S:-b; the index of the 18 pilot subcarriers in the upper half-band is a:S:(a+17*S). a, b and S are all positive integers.

[0349] 'a' represents the index of the first pilot subcarrier in the upper half-band, in ascending frequency order. '-b' represents the index of the last pilot subcarrier in the lower half-band, in ascending frequency order. 'S' represents the index difference between two adjacent pilot subcarriers.

[0350] For the explanation of (2) in 2A, please refer to the description of (3) in 1A above. It will not be elaborated here.

[0351] (3) For the 18 26-tone DRUs distributed in the upper half-band, the minimum value of 'a' can be determined by the maximum index among the indices of the first subcarrier of each of the 18 26-tone DRUs, and the maximum value of 'a+17*S' can be determined by the minimum index among the indices of the last subcarrier of each of the 18 26-tone DRUs. The first and last subcarriers shown here are relative to the order of frequency from low to high.

[0352] For example, in the upper half-band, the indices of the first subcarrier of each of the 18 26-tone DRUs are as follows: 10, 19, 14, 23, 27, 12, 21, 16, 25, 11, 20, 15, 24, 18, 13, 22, 17, 26. The largest index among these 18 indices is 27, so a can be greater than 27.

[0353] For example, in the upper half-band, the indices of the last subcarrier of each of the 18 26-tone DRUs are as follows: 226, 235, 230, 239, 243, 228, 237, 232, 241, 236, 231, 240, 234, 229, 238, 233, 242. The smallest index among these 18 indices is 226, so a+17*S can be less than 226.

[0354] For the 18 26-tone DRUs distributed in the lower half of the frequency band, the maximum value of -b can be determined by the minimum index among the indices of the first subcarrier of each of the 18 26-tone DRUs, and the minimum value of -(b+17*S) can be determined by the maximum index among the indices of the last subcarrier of each of the 18 26-tone DRUs. The first and last subcarriers shown here are relative to the order from high to low frequency.

[0355] For example, in the lower half-band, the indices of the first subcarrier of each 26-tone DRU in the 18 16-tone DRUs are as follows: -26, -17, -22, -13, -9, -24, -15, -20, -11, -25, -16, -21, -12, -18, -23, -14, -19, -10. The smallest index among these 18 indices is -26, so -b can be less than -26.

[0356] For example, in the lower half-band, the indices of the last subcarrier of each of the 18 26-tone DRUs are as follows: -242, -233, -238, -229, -225, -240, -231, -236, -227, -241, -232, -237, -228, -234, -239, -230, -235, -226. The largest index among these 18 indices is -225, so -(b+17*S) can be greater than -225.

[0357] The explanation of (3) in 2A can be found in the description of (4) in 1A above, and will not be elaborated here.

[0358] (4) The difference between a and b is an integer multiple of S.

[0359] For example, ab = n*S, or ba = n*S. n is an integer.

[0360] In this embodiment, the difference between a and b is an integer multiple of S, which can minimize the types of different 26-tone DRUs and ensure that the pilot subcarriers in the lower and upper half-bands are symmetrical.

[0361] (5) The greatest common divisor of S and 18 is 1.

[0362] For the explanation of (5) in 2A, please refer to the description of (5) in 1A above. It will not be elaborated here.

[0363] For example, S = 11, a = 38, b = 27. The index of these 36 pilot subcarriers can be [-214:11:-27,38:11:225].

[0364] The values ​​of S, a, and b will not be listed here.

[0365] (6) The indices of the 26 subcarriers of the first DRU are opposites of the indices of the 26 subcarriers of the second DRU.

[0366] Optionally, the index of the pilot subcarrier of the first DRU and the index of the pilot subcarrier of the second DRU can be opposites of each other.

[0367] For the explanation of (6) in 2A, please refer to the description of (6) in 1A above. It will not be elaborated here.

[0368] As one possible implementation, based on the determined index of each 26-tone DRU, pilot subcarriers are designed for each 26-tone DRU using the above (1) to (5).

[0369] As another possible implementation, based on satisfying (1) to (6) above, subcarriers can be designed for each 26-tone DRU, and two subcarriers can be selected as pilot subcarriers from the 26 subcarriers included in each 26-tone DRU.

[0370] For example, with a transmission bandwidth of 40MHz, the index of the guard subcarrier in the lower half-band is [-256:-245], the index of the DC subcarrier is [-2:2], and the index of the guard subcarrier in the upper half-band is [245:255]. The index range of the data subcarrier and pilot subcarrier in the lower half-band is [-244:-3], and the index range of the data subcarrier and pilot subcarrier in the upper half-band can be [3:244]. The index range of the data subcarrier and pilot subcarrier shown here is relative to the data subcarrier and pilot subcarrier in the subcarrier planning corresponding to the transmission bandwidth. For a DRU of a certain size, the above index range of the data subcarrier and pilot subcarrier may be different. For a 26-tone DRU, the index range for data subcarriers and pilot subcarriers in the lower half-band is [-242:-9], while the index range for data subcarriers and pilot subcarriers in the upper half-band can be [10:243]. The index ranges for DRUs of different sizes are not listed here.

[0371] For example, the indexes of the above 18 26-tone DRUs can be as follows:

[0372] The index range of 26-tone DRU 1 can be [-242:18:-26,10:18:226];

[0373] The index range of 26-tone DRU 2 can be [-233:18:-17,19:18:235];

[0374] The index range of 26-tone DRU 3 can be [-238:18:-22,14:18:230];

[0375] The index range of 26-tone DRU 4 can be [-229:18:-13,23:18:239];

[0376] The index range of 26-tone DRU 5 can be [-225:18:-9,27:18:243];

[0377] The index range of a 26-tone DRU 6 can be [-240:18:-24,12:18:228];

[0378] The index range of 26-tone DRU 7 can be [-231:18:-15,21:18:237];

[0379] The index range of a 26-tone DRU 8 can be [-236:18:-20,16:18:232];

[0380] The index range of 26-tone DRU 9 can be [-227:18:-11,25:18:241];

[0381] The index range of 26-tone DRU 10 can be [-241:18:-25,11:18:227];

[0382] The index range of 26-tone DRU 11 can be [-232:18:-16,20:18:236];

[0383] The index range of 26-tone DRU 12 can be [-237:18:-21,15:18:231];

[0384] The index range of 26-tone DRU 13 can be [-228:18:-12,24:18:240];

[0385] The index range of 26-tone DRU 14 can be [-234:18:-18,18:18:234];

[0386] The index range of 26-tone DRU 15 can be [-239:18:-23,13:18:229];

[0387] The index range of a 26-tone DRU 16 can be [-230:18:-14,22:18:238];

[0388] The index range of 26-tone DRU 17 can be [-235:18:-19,17:18:233];

[0389] The index range of 26-tone DRU 18 can be [-226:18:-10,26:18:242].

[0390] For each of the 26-tone DRUs listed above, the pilot subcarrier can satisfy at least one of (1) to (5) above. If (1) to (5) above are satisfied, pilot subcarriers can be designed for each 26-tone DRU.

[0391] In this embodiment, considering the position of the pilot subcarriers, the relative positions of the pilot subcarriers of 26-tone DRUs with the same structure can be the same or symmetrical. For example, the relative position of the pilot subcarrier of 26-tone DRU261 in 26-tone DRU1 is symmetrical to the relative position of the pilot subcarrier of 26-tone DRU18 in 26-tone DRU18, and the relative position of the pilot subcarrier of 26-tone DRU12 in 26-tone DRU12 is the same as the relative position of the pilot subcarrier of 26-tone DRU18 in 26-tone DRU18. That is, 26-tone DRU1, 26-tone DRU12, and 26-tone DRU18 belong to the same type.

[0392] For example, the relative positions of the pilot subcarriers of 26-tone DRU2 within 26-tone DRU2 and the relative positions of the pilot subcarriers of 26-tone DRU17 within 26-tone DRU17 are symmetrical. That is, 26-tone DRU2 and 26-tone DRU17 belong to the same type.

[0393] For example, the relative position of the pilot subcarrier of 26-tone DRU3 within 26-tone DRU3 is the same as the relative position of the pilot subcarrier of 26-tone DRU9 within 26-tone DRU9. Similarly, the relative position of the pilot subcarrier of 26-tone DRU10 within 26-tone DRU10 is the same as the relative position of the pilot subcarrier of 26-tone DRU16 within 26-tone DRU16. The relative position of the pilot subcarrier of 26-tone DRU3 within 26-tone DRU3 is symmetrical to the relative position of the pilot subcarrier of 26-tone DRU10 within 26-tone DRU10. In other words, 26-tone DRU3 / 26-tone DRU9, 26-tone DRU10, and 26-tone DRU16 belong to the same type.

[0394] For example, 26-toneDRU4, 26-toneDRU6, 26-toneDRU13, and 26-toneDRU15 belong to the same type. Similarly, 26-toneDRU5, 26-toneDRU8, and 26-toneDRU11 belong to the same type. And 26-toneDRU7 and 26-toneDRU12 belong to the same type.

[0395] The following will illustrate the pilot subcarriers of each 26-tone DRU in ascending order of frequency.

[0396] As an example 4, with S=11, a=38, b=27, the relative positions and indices of the pilot subcarriers of each 26-tone DRU can be shown below:

[0397] In a 26-tone DRU 1, the 5th and 18th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 1 can be [-170, 82].

[0398] In a 26-tone DRU 2, the 10th and 23rd subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 2 can be [-71, 181].

[0399] In a 26-tone DRU 3, the 6th and 19th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 3 can be [-148, 104].

[0400] In a 26-tone DRU 4, the 11th and 24th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 4 can be [-49, 203].

[0401] In a 26-tone DRU 5, the 12th and 25th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 5 can be [-27, 225].

[0402] In a 26-tone DRU 6, the 11th and 24th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 6 can be [-60, 192].

[0403] In a 26-tone DRU 7, the 5th and 18th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 7 can be [-159, 93].

[0404] In a 26-tone DRU 8, the 12th and 25th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 8 can be [-38, 214].

[0405] In a 26-tone DRU 9, the 6th and 19th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 9 can be [-137, 115].

[0406] In a 26-tone DRU 10, the 8th and 21st subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 10 can be [-115, 137].

[0407] In a 26-tone DRU 11, the 2nd and 15th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 11 can be [-214, 38].

[0408] In a 26-tone DRU 12, the 9th and 22nd subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 12 can be [-93, 159].

[0409] In a 26-tone DRU 13, the 3rd and 16th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 13 can be [-192, 60].

[0410] In a 26-tone DRU 14, the 7th and 20th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 14 can be [-126, 126].

[0411] In a 26-tone DRU 15, the 3rd and 16th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 15 can be [-203, 49].

[0412] In a 26-tone DRU 16, the 8th and 21st subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 16 can be [-104, 148].

[0413] In a 26-tone DRU 17, the 4th and 17th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 17 can be [-181, 71].

[0414] In a 26-tone DRU 18, the 9th and 22nd subcarriers can be pilot subcarriers. Taking Table 7 as an example, the index of the pilot subcarriers in a 26-tone DRU 18 can be [-82, 170].

[0415] The pilot subcarriers of each 26-tone DRU corresponding to other values ​​of S, a, and b are not listed here. This application embodiment does not limit the index of the pilot subcarriers corresponding to the relative positions of each DRU. The index of the pilot subcarriers can change as the index range of each DRU changes. The explanation regarding relative positions and pilot subcarrier indexes also applies below and will not be repeated.

[0416] In this embodiment, 18 pilot subcarriers for 26-tone DRUs corresponding to 40MHz are designed. The 36 pilot subcarriers corresponding to these 18 26-tone DRUs can be evenly distributed within the 40MHz range. Simultaneously, the relative positions of the pilot subcarriers of structurally identical 26-tone DRUs can be the same or symmetrical, thus allowing these 18 26-tone DRUs to have 5 different types. This minimizes the number of different types of these 18 26-tone DRUs, effectively reducing the complexity of subcarrier mapping and demapping. Since the LTF sequence is designed based on each DRU individually, ensuring that the relative positions of the pilot subcarriers of structurally identical 26-tone DRUs are symmetrical or the same further simplifies the design complexity of the LTF sequence.

[0417] 2B, 52-tone DRU

[0418] 52-tone DRU 1 to 52-tone DRU 8 are distributed in the lower half-band and upper half-band, respectively.

[0419] Among the eight 52-tone DRUs mentioned above, there can be two 52-tone DRUs (such as the first DRU and the second DRU shown below) that satisfy the following:

[0420] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is the same as or symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0421] In the first DRU, subcarriers X1, X2, X3, and X4 are pilot subcarriers, arranged in ascending frequency order. Similarly, in the second DRU, subcarriers X1, X2, X3, and X4 are pilot subcarriers, arranged in descending frequency order, or vice versa. Here, X1, X2, X3, and X4 are distinct integers. The first and second DRUs can be understood as two different 52-tone DRUs out of eight 52-tone DRUs.

[0422] For explanations regarding the order of frequency from low to high (or the order of index from small to large) and the order of frequency from high to low (or the order of index from large to small), please refer to the descriptions in 2A or 1A above, which will not be repeated here.

[0423] For eight 52-tone DRUs distributed in the lower and upper half-bands, these eight 52-tone DRUs can include a total of 32 pilot subcarriers. The upper and lower half-bands can each have 16 pilot subcarriers. The 16 pilot subcarriers in the lower half-band can be evenly distributed within the lower half-band, and the 16 pilot subcarriers in the upper half-band can be evenly distributed within the upper half-band. These 16 pilot subcarriers can also satisfy the following:

[0424] (2) The 16 pilot subcarriers in the lower half-band are 16 of the following 18 pilot subcarriers: -(b+17*S):S:-b; The 16 pilot subcarriers in the upper half-band are 16 of the following 18 pilot subcarriers: a:S:(a+17*S).

[0425] The pilot subcarriers of the first DRU may include two of the 16 pilot subcarriers in the lower half-band and two of the 16 pilot subcarriers in the upper half-band. The pilot subcarriers of the second DRU may include two of the 16 pilot subcarriers in the lower half-band and two of the 16 pilot subcarriers in the upper half-band.

[0426] For the explanation of (2) in 2B, please refer to (2) to (4) in 2A or the description in 1A, etc., which will not be elaborated here.

[0427] (3) The indices of the 52 subcarriers of the first DRU and the indices of the 52 subcarriers of the second DRU are opposites of each other.

[0428] Optionally, the index of the pilot subcarrier of the first DRU and the index of the pilot subcarrier of the second DRU can be opposites of each other.

[0429] For the explanation of (3) in 2B, please refer to the description of (6) in 1A or (6) in 2A. It will not be elaborated here.

[0430] As one possible implementation, based on the determined index of each 52-tone DRU, pilot subcarriers can be designed for each 52-tone DRU according to the above (1) to (2).

[0431] As another possible implementation, based on satisfying (1) to (3) above, subcarriers can be designed for each 52-tone DRU, and 4 subcarriers can be selected as pilot subcarriers from the 52 subcarriers included in each 52-tone DRU.

[0432] As another possible implementation, based on the 26-tone DRUs shown in 2A above, and considering the relationship between the 26-tone DRUs and 52-tone DRUs (e.g., one 52-tone DRU can include two 26-tone DRUs), the pilot subcarriers of each 52-tone DRU can be designed. The relationship between the 26-tone DRUs and 52-tone DRUs, and the relationship between the pilot subcarriers, will not be detailed here. The conditions that the pilot subcarriers of the 52-tone DRUs must satisfy can be found in the description of the 26-tone DRUs in 2A, and will not be detailed here.

[0433] Table 7 provides an example of the index ranges for each 52-tone DRU, which will not be detailed here. For example, 52-tone DRU 1 and 52-tone DRU 8 can belong to the same type, 52-tone DRU 2 and 52-tone DRU 7 can belong to the same type, 52-tone DRU 3 and 52-tone DRU 7 can belong to the same type, and 52-tone DRU 4 and 52-tone DRU 5 can belong to the same type.

[0434] Taking S=11, a=38, b=27 as an example, the relative positions and indices of the pilot subcarriers of each 52-tone DRU can be shown below:

[0435] In a 52-tone DRU 1, the 9th, 20th, 35th, and 46th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 1 can be [-170, -71, 82, and 181].

[0436] In a 52-tone DRU 2, the 11th, 22nd, 37th, and 48th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 2 can be [-148, -49, 104, and 203].

[0437] In a 52-tone DRU 3, the 10th, 21st, 36th, and 47th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 3 can be [-159, -60, 93, and 192].

[0438] In a 52-tone DRU 4, the 12th, 23rd, 38th, and 49th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 4 can be [-137, -38, 115, and 214].

[0439] In a 52-tone DRU 5, the 4th, 15th, 30th, and 41st subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 5 can be [-214, -115, 38, and 137].

[0440] In a 52-tone DRU 6, the 6th, 17th, 32nd, and 43rd subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 6 can be [-192, -93, 60, and 159].

[0441] In a 52-tone DRU 7, the 5th, 16th, 31st, and 42nd subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 7 can be [-203, -104, 49, and 148].

[0442] In a 52-tone DRU 8, the 7th, 18th, 33rd, and 44th subcarriers can be pilot subcarriers. Taking Table 7 as an example, the indices of the pilot subcarriers in a 52-tone DRU 8 can be [-181, -82, 71, and 170].

[0443] The pilot subcarriers of each 52-tone DRU corresponding to the other values ​​of S, a, and b are not listed here.

[0444] 2C, 106-tone DRU

[0445] 106-tone DRU 1 to 106-tone DRU 4 can be distributed in the lower half-band and upper half-band, respectively.

[0446] The above four 106-tone DRUs can each have two 106-tone DRUs (the first DRU and the second DRU shown below) that satisfy at least one of the following (1) to (3):

[0447] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is the same as or symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0448] For example, 106-tone DRU 1 and 106-tone DRU 4 can belong to the same type, and 106-tone DRU 2 and 106-tone DRU 3 can belong to the same type. For related explanations of the types, please refer to the above text; further details will not be provided here.

[0449] For an explanation of 2C, please refer to the descriptions above, such as 2A, 2B, 1A, 1B, or 1C, etc., which will not be elaborated here.

[0450] For four 106-tone DRUs distributed in the lower and upper half-bands, these four 106-tone DRUs can include a total of 16 pilot subcarriers. There are 8 pilot subcarriers in the upper half-band and 8 pilot subcarriers in the lower half-band. The 8 pilot subcarriers in the lower half-band can be evenly distributed within the lower half-band, and the 8 pilot subcarriers in the upper half-band can be evenly distributed within the upper half-band. These 16 pilot subcarriers can also satisfy the following:

[0451] (2) The eight pilot subcarriers in the lower half-band are eight of the following eighteen pilot subcarriers: -(b+17*S):S:-b; The eight pilot subcarriers in the upper half-band are eight of the following eighteen pilot subcarriers: a:S:(a+17*S).

[0452] For an explanation of (2) in 2C, please refer to the descriptions in 2A or 2B, etc., which will not be elaborated here.

[0453] (3) The indices of the 106 subcarriers of the first DRU and the indices of the 106 subcarriers of the second DRU are opposites of each other.

[0454] Optionally, the index of the pilot subcarrier of the first DRU and the index of the pilot subcarrier of the second DRU can be opposites of each other.

[0455] The explanation of (3) in 2C can be found in the above description, and will not be elaborated here. The conditions that the pilot subcarriers of the 106-tone DRU must meet can be found in the description of the 26-tone DRU in 2A, and will not be elaborated here.

[0456] In this embodiment, 106-tone DRU 1 and 106-tone DRU 4 can belong to the same type, and 106-tone DRU 2 and 106-tone DRU 3 can belong to the same type. For related explanations regarding the types, please refer to the above text; further details are omitted here.

[0457] As one possible implementation, the pilot subcarrier of a 106-tone DRU can be designed in conjunction with the 26-tone DRU shown in 2A above.

[0458] As another possible implementation, the pilot subcarriers of a 106-tone DRU can be designed in conjunction with the 52-tone DRU shown in 2B above.

[0459] As another possible implementation, the pilot subcarriers of the 106-tone DRU can be designed separately by combining (1) and (2) in 2C. The design method for the pilot subcarriers of each of the four 106-tone DRUs corresponding to 40MHz will not be detailed here. The relationship between DRUs of different sizes will not be detailed here.

[0460] For example, the pilot subcarriers of 106-tone DRU 1 can be 4 of the following 8 pilot subcarriers, with indices of [-170, -148, -71, -49, 82, 104, 181, 203]. The pilot subcarriers of 106-tone DRU 2 can be 4 of the following 8 pilot subcarriers, with indices of [-159, -137, -60, -38, 93, 115, 192, 214]. The pilot subcarriers of 106-tone DRU 3 can be 4 of the following 8 pilot subcarriers, with indices of [-214, -192, -115, -93, 38, 60, 137, 159]. The pilot subcarriers of a 106-tone DRU 4 can be 4 of the following 8 pilot subcarriers, and the indices of these 8 pilot subcarriers can be [-203,-181,-104,-82,49,71,148,170].

[0461] For information on the subcarrier indices of each 106-tone DRU, please refer to Table 7 below. For information on the pilot subcarriers of each 106-tone DRU, please refer to Table 8 below.

[0462] 2D, 242-tone DRU

[0463] 242-tone DRU 1 and 242-tone DRU 2 can be distributed in the lower half-band and upper half-band, respectively.

[0464] As one possible implementation, the pilot subcarriers of a 242-tone DRU can be designed in conjunction with the 26-tone DRU shown in 2A above. For example, a 242-tone DRU may include eight 26-tone DRUs. The eight pilot subcarriers in this 242-tone DRU can be eight of the sixteen pilot subcarriers corresponding to these eight 26-tone DRUs.

[0465] As another possible implementation, the pilot subcarriers of a 242-tone DRU can be designed in conjunction with the 52-tone DRU shown in 2B. For example, a 242-tone DRU can include four 52-tone DRUs. The eight pilot subcarriers in this 242-tone DRU can be eight of the sixteen pilot subcarriers corresponding to these four 52-tone DRUs.

[0466] As another possible implementation, the pilot subcarriers of a 242-tone DRU can be designed in conjunction with the 106-tone DRU shown in 2C. For example, a 242-tone DRU can include two 106-tone DRUs. The eight pilot subcarriers of this 242-tone DRU can be the eight pilot subcarriers corresponding to these two 106-tone DRUs.

[0467] As another possible implementation, the pilot subcarriers of each 242-tone DRU can be designed individually based on the conditions satisfied by the 242-tone DRU. The conditions satisfied by the pilot subcarriers of the 242-tone DRU can be found in the description of the 26-tone DRU in section 2A, and will not be elaborated upon here.

[0468] Of course, since a 242-tone DRU can include two 106-tone DRUs and one 26-tone DRU, the eight pilot subcarriers in the 242-tone DRU can also be eight of the ten pilot subcarriers corresponding to the two 106-tone DRUs and one 26-tone DRU. The specific method for selecting eight pilot subcarriers from the ten pilot subcarriers is not limited in the embodiments of this application. The following example illustrates that the eight pilot subcarriers of the 242-tone DRU are the eight pilot subcarriers corresponding to the two included 106-tone DRUs, but this should not be construed as a limitation on the embodiments of this application.

[0469] For example, 242-tone DRU 1 and 242-tone DRU 2 can satisfy:

[0470] In 242-tone DRU 1, the X1st, X2nd, X3rd, X4th, X5th, X6th, X7th, and X8th subcarriers are pilot subcarriers, arranged in ascending frequency order. Similarly, in 242-tone DRU 2, the X1st, X2nd, X3rd, X4th, X5th, X6th, X7th, and X8th subcarriers are pilot subcarriers, arranged in descending frequency order; or, in 242-tone DRU 2, the X1st, X2nd, X3rd, X4th, X5th, X6th, X7th, and X8th subcarriers are pilot subcarriers, arranged in ascending frequency order. For example, 242-tone DRU 1 and 242-tone DRU 2 can belong to the same type.

[0471] For example, the pilot subcarriers of 242-tone DRU 1 can be 8 of the following 16 pilot subcarriers, with indices of [-170, -159, -148, -137, -71, -60, -49, -38, 82, 93, 104, 115, 181, 192, 203, 214]. The pilot subcarriers of 242-tone DRU 2 can be 8 of the following 16 pilot subcarriers, with indices of [-214, -203, -192, -181, -115, -104, -93, -82, 38, 49, 60, 71, 137, 148, 159, 170].

[0472] For information on the subcarrier indices of each 242-tone DRU, please refer to Table 7 below. For information on the pilot subcarriers of each 242-tone DRU, please refer to Table 8 below.

[0473] Table 7 illustrates, for example, the relationship between DRUs of different sizes at 40MHz.

[0474] Table 7

[0475] Taking the values ​​of S, a, and b shown in Example 4 above as an example, the relative positions of the pilot subcarriers of each DRU corresponding to 40MHz can be seen in Table 8:

[0476] Table 8

[0477] For Table 8, the 17th, 39th, 71st, and 93rd subcarriers in 106-tone DRU 1 are pilot subcarriers, with indices of [-170, -71, 82, 181]. The 24th, 46th, 78th, and 100th subcarriers in 106-tone DRU 2 are pilot subcarriers, with indices of [-137, -38, 115, 214]. The 7th, 29th, 61st, and 83rd subcarriers in 106-tone DRU 3 are pilot subcarriers, with indices of [-214, -115, 38, 137]. The 14th, 36th, 68th, and 90th subcarriers in 106-tone DRU 4 are pilot subcarriers, and the index of the pilot subcarriers in 106-tone DRU 4 is [-181, -82, 71, 170]. The relative positions and indices of the various 106-tone DRUs shown in Table 8 are merely examples and should not be construed as limiting the embodiments of this application.

[0478] For Table 8, the 38th, 54th, 87th, 104th, 162th, 178th, 211th, and 228th subcarriers of 242-tone DRU 1 are pilot subcarriers, such as the index of the pilot subcarriers of 242-tone DRU 1 being [-170, -137, -71, -38, 82, 115, 181, 214]. The 16th, 32nd, 65th, 82th, 139th, 155th, 188th, and 205th subcarriers of 242-tone DRU 2 are pilot subcarriers, such as the index of the pilot subcarriers of 242-tone DRU 2 being [-214, -181, -115, -82, 38, 71, 137, 170].

[0479] For explanations of Tables 7 and 8, please refer to the descriptions in Table 4 above, etc., which will not be elaborated here.

[0480] In this embodiment, pilot subcarriers for each DRU are designed with a bandwidth of 40MHz, so that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 26-tone DRUs, 26-toneDRU1, 26-toneDRU7, 26-toneDRU12, and 26-toneDRU18 belong to the same type; 26-toneDRU2 and 26-toneDRU17 belong to the same type; 26-toneDRU3, 26-toneDRU9, 26-toneDRU10, and 26-toneDRU16 belong to the same type; 26-toneDRU4, 26-toneDRU6, 26-toneDRU13, and 26-toneDRU15 belong to the same type; and 26-toneDRU5, 26-toneDRU8, and 26-toneDRU11 belong to the same type. For 52-tone DRUs, 52-tone DRU 1 and 52-tone DRU 8 belong to the same type; 52-tone DRU 2 and 52-tone DRU 7 belong to the same type; 52-tone DRU 3 and 52-tone DRU 6 belong to the same type; and 52-tone DRU 4 and 52-tone DRU 5 belong to the same type. For 106-tone DRUs, 106-tone DRU 1 and 106-tone DRU 4 belong to the same type; and 106-tone DRU 2 and 106-tone DRU 3 belong to the same type. For 242-tone DRUs, 242-tone DRU 1 and 242-tone DRU 2 belong to the same type. This reduces the implementation complexity of subcarrier mapping and demapping, while simplifying the design of DRU LTF sequences.

[0481] Implementation Method 3

[0482] The transmission bandwidth is 40MHz. For details on subcarrier planning corresponding to 40MHz, please refer to Implementation Method 2; it will not be elaborated upon here.

[0483] Regarding implementation method three:

[0484] The 18 pilot subcarriers in the lower half-band can be evenly distributed within the band. The index of each of these 18 pilot subcarriers can be determined by the total number of subcarriers in the lower half-band and the total number of pilot subcarriers in the lower half-band (i.e., 18). For example, these 18 pilot subcarriers can satisfy the following condition: the index difference between any two adjacent pilot subcarriers is 10, 11, or 12.

[0485] The 18 pilot subcarriers in the upper half-band can also be evenly distributed within that upper half-band. The index of each pilot subcarrier in these 18 pilot subcarriers can be determined by the total number of subcarriers in the upper half-band and the total number of pilot subcarriers in the upper half-band (i.e., 18). For example, these 18 pilot subcarriers can satisfy the following condition: the index difference between any two adjacent pilot subcarriers is 10, 11, or 12.

[0486] For example, the indices of pilot subcarriers in the lower half-band are opposites of those in the upper half-band. This effectively reduces the number of different 26-tone DRU types, thereby significantly reducing the implementation complexity of subcarrier mapping and demapping, and simplifying the design complexity of LTF sequences. If a subcarrier with index 'a' in the upper half-band is a pilot subcarrier, then a subcarrier with index '-a' in the lower half-band is also a pilot subcarrier. The following uses the subcarrier indices of each DRU shown in Table 7 as an example to illustrate the pilot subcarriers of each DRU.

[0487] The relative positions of the pilot subcarriers of each DRU within its respective DRU at a bandwidth of 40MHz can be found in Tables 9 and 10. Table 8 provides an example of the index range of the subcarriers for each DRU at 40MHz.

[0488] As one possible implementation, the indices of these 36 pilot subcarriers can be [-205,-195,-184,-174,-164,-154,-144,-134,-124,-113,-103,-91,-81,-71,-60,-50,-39,-29,29,39,50,60,71,81,91,103,113,124,134,144,154,164,174,184,195,205].

[0489] For example, taking the subcarrier index range of each DRU shown in Table 8 as an example, the index of the pilot subcarrier of each 26-tone DRU can be as follows:

[0490] The index of the pilot subcarrier of 26-tone DRU 1 can be [-134, 154].

[0491] The index of the pilot subcarrier of 26-tone DRU 2 can be [-71, 91].

[0492] The index of the pilot subcarrier of 26-tone DRU 3 can be [-184, 50].

[0493] The index of the pilot subcarrier of 26-tone DRU 4 can be [-103, 113].

[0494] The index of the pilot subcarrier of 26-tone DRU 5 can be [-81, 81].

[0495] The index of the pilot subcarrier of 26-tone DRU 6 can be [-60, 174].

[0496] The index of the pilot subcarrier of 26-tone DRU 7 can be [-195, 39].

[0497] The index of the pilot subcarrier of a 26-tone DRU 8 can be [-164, 124].

[0498] The index of the pilot subcarrier of 26-tone DRU 9 can be [-29, 205].

[0499] The index of the pilot subcarrier of a 26-tone DRU 10 can be [-205, 29].

[0500] The index of the pilot subcarrier of 26-tone DRU 11 can be [-124, 164].

[0501] The index of the pilot subcarrier of a 26-tone DRU 12 can be [-39, 195].

[0502] The index of the pilot subcarrier of 26-tone DRU 13 can be [-174, 60].

[0503] The index of the pilot subcarrier of 26-tone DRU 14 can be [-144, 144].

[0504] The index of the pilot subcarrier of 26-tone DRU 15 can be [-113, 103].

[0505] The index of the pilot subcarrier of a 26-tone DRU 16 can be [-50, 184].

[0506] The index of the pilot subcarrier of 26-tone DRU 17 can be [-91, 71].

[0507] The index of the pilot subcarrier of 26-tone DRU 18 can be [-154, 134].

[0508] The index of the pilot subcarrier of 52-tone DRU 1 can be [-134, -71, 91, 154].

[0509] The index of the pilot subcarrier of 52-tone DRU 2 can be [-184, -103, 50, 113].

[0510] The index of the pilot subcarrier of 52-tone DRU 3 can be [-195, -60, 39, 174].

[0511] The index of the pilot subcarrier of 52-tone DRU 4 can be [-164, -29, 124, 205].

[0512] The index of the pilot subcarrier of 52-tone DRU 5 can be [-205, -124, 29, 164].

[0513] The index of the pilot subcarrier of 52-tone DRU 6 can be [-174, -39, 60, 195].

[0514] The index of the pilot subcarrier of 52-tone DRU 7 can be [-113, -50, 103, 184].

[0515] The index of the pilot subcarrier of 52-tone DRU 8 can be [-154, -91, 71, 134].

[0516] The pilot subcarriers of 106-tone DRU 1 can be four of the following eight pilot subcarriers, whose indices are [-184, -134, -103, -71, 50, 91, 113, 154]. Taking the relative positions of 106-tone DRU 1 shown in Table 9 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-134, -71, 91, 154].

[0517] The pilot subcarriers of 106-tone DRU 2 can be four of the following eight pilot subcarriers, whose indices are [-195, -164, -60, -29, 39, 124, 174, 205]. Taking the relative positions shown in Table 9 for 106-tone DRU 2 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-164, -29, 124, 205].

[0518] The pilot subcarriers of 106-tone DRU 3 can be four of the following eight pilot subcarriers, whose indices are [-205, -174, -124, -39, 29, 60, 164, 195]. Taking the relative positions shown in Table 9 for 106-tone DRU 3 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-205, -124, 29, 164].

[0519] The pilot subcarriers of 106-tone DRU 4 can be four of the following eight pilot subcarriers, whose indices are [-154, -113, -91, -50, 71, 103, 134, 184]. Taking the relative positions shown in Table 9 for 106-tone DRU 4 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-154, -91, 71, 134].

[0520] Taking Table 9 as an example, the index of the pilot subcarrier of 242-tone DRU 1 can be [-164,-134,-71,-29,91,124,154,205]. The index of the pilot subcarrier of 242-tone DRU 2 can be [-205,-154,-124,-91,29,71,134,164].

[0521] For example, the relative positions of the pilot subcarriers of each DRU corresponding to 40MHz can be shown in Table 9:

[0522] Table 9

[0523] For an explanation of Table 9, please refer to the descriptions in Table 4 or Table 5, etc., which will not be elaborated here.

[0524] As another possible implementation, the index of these 36 pilot subcarriers can be [-205,-195,-184,-174,-163,-153,-143,-131,-121,-110,-100,-90,-80,-70,-60,-50,-39,-29,29,39,50,60,70,80,90,100,110,121,131,143,153,163,174,184,195,205].

[0525] For example, the indexes of the pilot subcarriers of each 26-tone DRU can be as follows:

[0526] The index of the pilot subcarrier of 26-tone DRU 1 can be [-80, 100].

[0527] The index of the pilot subcarrier of 26-tone DRU 2 can be [-143, 163].

[0528] The index of the pilot subcarrier of 26-tone DRU 3 can be [-184, 50].

[0529] The index of the pilot subcarrier of 26-tone DRU 4 can be [-121, 131].

[0530] The index of the pilot subcarrier of 26-tone DRU 5 can be [-153, 153].

[0531] The index of the pilot subcarrier of 26-tone DRU 6 can be [-60, 174].

[0532] The index of the pilot subcarrier of 26-tone DRU 7 can be [-195, 39].

[0533] The index of the pilot subcarrier of 26-tone DRU 8 can be [-110, 70].

[0534] The index of the pilot subcarrier of 26-tone DRU 9 can be [-29, 205].

[0535] The index of the pilot subcarrier of a 26-tone DRU 10 can be [-205, 29].

[0536] The index of the pilot subcarrier of 26-tone DRU 11 can be [-70, 110].

[0537] The index of the pilot subcarrier of a 26-tone DRU 12 can be [-39, 195].

[0538] The index of the pilot subcarrier of 26-tone DRU 13 can be [-174, 60].

[0539] The index of the pilot subcarrier of 26-tone DRU 14 can be [-90, 90].

[0540] The index of the pilot subcarrier of 26-tone DRU 15 can be [-131, 121].

[0541] The index of the pilot subcarrier of a 26-tone DRU 16 can be [-50, 184].

[0542] The index of the pilot subcarrier of 26-tone DRU 17 can be [-163, 143].

[0543] The index of the pilot subcarrier of 26-tone DRU 18 can be [-100 and ,80].

[0544] The index of the pilot subcarrier of 52-tone DRU 1 can be [-143, -80, 100, 163].

[0545] The index of the pilot subcarrier of 52-tone DRU 2 can be [-184, -121, 50, 131].

[0546] The index of the pilot subcarrier of 52-tone DRU 3 can be [-195, -60, 39, 174].

[0547] The index of the pilot subcarrier of 52-tone DRU 4 can be [-110, -29, 70, 205].

[0548] The index of the pilot subcarrier of 52-tone DRU 5 can be [-205, -70, 29, 110].

[0549] The index of the pilot subcarrier of 52-tone DRU 6 can be [-174, -39, 60, 195].

[0550] The index of the pilot subcarrier of 52-tone DRU 7 can be [-131, -50, 121, 184].

[0551] The index of the pilot subcarrier of 52-tone DRU 8 can be [-163, -100, 80, 143].

[0552] The pilot subcarriers of 106-tone DRU 1 can be four of the following eight pilot subcarriers, whose indices are [-184, -143, -121, -80, 50, 100, 131, 163]. Taking the relative positions of 106-tone DRU 1 shown in Table 10 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-143, -80, 100, 163].

[0553] The pilot subcarriers of 106-tone DRU 2 can be four of the following eight pilot subcarriers, whose indices are [-195, -110, -60, -29, 39, 70, 174, 205]. Taking the relative positions of 106-tone DRU 2 shown in Table 10 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-110, -29, 70, 205].

[0554] The pilot subcarriers of 106-tone DRU 3 can be four of the following eight pilot subcarriers, whose indices are [-205, -174, -70, -39, 29, 60, 110, 195]. Taking the relative positions of 106-tone DRU 3 shown in Table 10 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-205, -70, 29, 110].

[0555] The pilot subcarriers of 106-tone DRU 4 can be four of the following eight pilot subcarriers, whose indices are [-163, -131, -100, -50, 80, 121, 143, 184]. Taking the relative positions shown in Table 10 for 106-tone DRU 4 as an example, the indices of the pilot subcarriers of 106-tone DRU 1 are [-163, -100, 80, 143].

[0556] Taking Table 10 as an example, the index of the pilot subcarrier of 242-tone DRU 1 can be [-143,-110,-80,-29,70,100,163,205]. The index of the pilot subcarrier of 242-tone DRU 2 can be [-205,-163,-100,-70,29,80,110,143].

[0557] For example, the relative positions of the pilot subcarriers of each DRU corresponding to 40MHz can be shown in Table 10:

[0558] Table 10

[0559] For an explanation of Table 10, please refer to the descriptions in Table 4 or Table 5, etc., which will not be elaborated here.

[0560] The indexes of each DRU in Tables 9 and 10 can be found in Table 7, and will not be detailed here.

[0561] In this embodiment, pilot subcarriers for the DRU with a bandwidth of 40MHz are designed so that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For a 26-tone DRU, 26-toneDRUi and 26-toneDRU19-i belong to the same type (i = 1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18). For a 52-tone DRU, 52-toneDRUi and 52-toneDRU(9-i) belong to the same type (i = 1, 2, 3, and 4). For a 106-tone DRU, 106-toneDRUi and 106-toneDRU(5-i) belong to the same type (i = 1 and 2). For a 242-tone DRU, 242-toneDRU1 and 242-toneDRU2 belong to the same type. This reduces the implementation complexity of subcarrier mapping and demapping, while simplifying the design of DRU LTF sequences.

[0562] Implementation Method 4

[0563] With a transmission bandwidth of 80MHz, the subcarrier planning corresponding to this bandwidth can include 16 52-tone DRUs, 8 106-tone DRUs, 4 242-tone DRUs, or 2 484-tone DRUs. When the transmission bandwidth is 80MHz, the target DRU can be one of the 16 52-tone DRUs, one of the 8 106-tone DRUs, one of the 4 242-tone DRUs, or one of the 2 484-tone DRUs. Alternatively, the target DRU can also be a combination of two or more DRUs selected from 26-tone, 52-tone, 106-tone, 242-tone, or 484-tone DRUs.

[0564] 4A, 52-tone DRU

[0565] 52-tone DRU 1 to 52-tone DRU 16 are distributed in the lower half-band and upper half-band, respectively.

[0566] The above 16 52-tone DRUs can each have two DRUs (the first DRU and the second DRU shown below) that satisfy at least one of the following (1) to (3):

[0567] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is the same as or symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0568] In the first DRU, the X1th, X2th, X3th, and X4th subcarriers are pilot subcarriers, arranged in ascending frequency order. Similarly, in the second DRU, the X1th, X2th, X3th, and X4th subcarriers are pilot subcarriers, arranged in descending frequency order; or, in the second DRU, the X1th, X2th, X3th, and X4th subcarriers are pilot subcarriers, arranged in ascending frequency order. Here, X1, X2, X3, and X4 are distinct integers.

[0569] For an explanation of (1) in 4A, please refer to the description of (1) in the above implementation method, etc., and will not be elaborated here.

[0570] (2) For 52-tone DRU 1 to 52-tone DRU 16, the k-th pilot subcarrier of each 52-tone DRU satisfies: c k :11:(165+c k )

[0571] Among them, c k This indicates the relative position of the k-th pilot subcarrier in 52-tone DRU 1 to 52-tone DRU 16, where k = 1, 2, 3, 4.

[0572] For example, if k = 1, then the first pilot subcarrier of each of the 16 52-tone DRUs can satisfy: c1:11:(165+c1). That is, for these 16 52-tone DRUs, taking the first pilot subcarrier of each 52-tone DRU as an example, there are a total of 16 pilot subcarriers. The relative positions of these 16 pilot subcarriers within the 16 52-tone DRUs satisfy the above condition. For example, if c1 = 32, it means that among the subcarriers corresponding to these 16 52-tone DRUs, if the subcarriers of these 16 52-tone DRUs are arranged in ascending frequency order, with the starting position numbered as 1, then the 32nd position is a pilot subcarrier, the 32+11th position is a pilot subcarrier, and so on, up to the 197th position is a pilot subcarrier.

[0573] For example, if k = 2, then the second pilot subcarrier of each of the 16 52-tone DRUs can satisfy the following condition: c2:11:(165+c2). That is, for these 16 52-tone DRUs, taking the second pilot subcarrier of each 52-tone DRU as an example, there are a total of 16 pilot subcarriers. The relative positions of these 16 pilot subcarriers within the 16 52-tone DRUs satisfy the above condition. For example, if c2 = 224, it means that among the subcarriers corresponding to these 16 52-tone DRUs, if the subcarriers of these 16 52-tone DRUs are arranged in ascending frequency order, with the starting position numbered as 1, then the 224th position is a pilot subcarrier, the 224+11th position is a pilot subcarrier, and so on, up to the 389th position.

[0574] For example, if k = 3, then the third pilot subcarrier of each of the 16 52-tone DRUs can satisfy: c3:11:(165+c3). If c3 = 448, it means that among the subcarriers corresponding to the 16 52-tone DRUs, if the subcarriers of these 16 52-tone DRUs are arranged in ascending order of frequency, with the starting position numbered as 1, then the 448th position is a pilot subcarrier, the 448+11th position is a pilot subcarrier, and so on, with the 613th position being a pilot subcarrier.

[0575] For example, if k = 4, then the 4th pilot subcarrier of each of the 16 52-tone DRUs can satisfy: c4:11:(165+c4). If c4 = 640, it means that among the subcarriers corresponding to the 16 52-tone DRUs, if the subcarriers of these 16 52-tone DRUs are arranged in ascending order of frequency, with the starting position numbered as 1, then the 640th position is a pilot subcarrier, the 640+11th position is a pilot subcarrier, and so on, with the 805th position being a pilot subcarrier.

[0576] In this embodiment, the 832 subcarriers corresponding to 52-tone DRU 1 to 52-tone DRU 16 are arranged in order of frequency from low to high. The interval between adjacent pilot subcarriers is 11. 11 and 16 (i.e. the number of 52-tone DRUs) are coprime (i.e., the greatest common divisor is 1). This can effectively ensure that each of the above 16 pilot subcarriers can belong to different 52-tone DRUs.

[0577] In the embodiments of this application, different c kPilot subcarriers at corresponding positions can belong to the same 52-tone DRU, thus the relative positions of pilot subcarriers in each 52-tone DRU can be the same. For example, the 832 subcarriers corresponding to 52-tone DRU 1 to 52-tone DRU 16, arranged in ascending frequency order, mean that the pilot subcarriers at positions c1, c2, c3, and c4 can belong to the same 52-tone DRU.

[0578] It is understandable that the pilot subcarrier index can also be designed using the design approach shown in (2) above when the transmission bandwidth is 20MHz or 40MHz. The design approach for the transmission bandwidth of 20MHz or 40MHz will not be described in detail here.

[0579] (3)c k It can be determined by the subcarrier index range corresponding to the k-th pilot subcarrier. For example, the value of c1 can be less than 13*16, the value of c2 can be less than 13*2*16, the value of c3 can be less than 13*3*16, and the value of c4 can be less than 13*4*16.

[0580] That is, the first pilot subcarrier of each 52-tone DRU can be located within the first 13 subcarriers of each 52-tone DRU (i.e., each 52-tone DRU can be divided into 4 groups of 13 subcarriers (or in other words, each 52-tone DRU can be divided into 4 groups of 13 subcarriers)), the second pilot subcarrier of each 52-tone DRU can be located within the second 13 subcarriers of each 52-tone DRU, the third pilot subcarrier of each 52-tone DRU can be located within the third 13 subcarriers of each 52-tone DRU, and the fourth pilot subcarrier of each 52-tone DRU can be located within the fourth 13 subcarriers of each 52-tone DRU.

[0581] In this embodiment of the application, by satisfying the above conditions (1) to (3), the pilot subcarriers in the lower half-band and the pilot subcarriers in the upper half-band can be evenly distributed. For example, after merging and arranging the subcarriers of 16 52-tone DRUs, the relative positions of the pilot subcarriers of each 52-tone DRU can still be evenly distributed.

[0582] It is understood that the uniform distribution of relative positions shown in the embodiments of this application means that the relative positions of the pilot subcarriers in the lower and upper half-bands are uniformly distributed relative to the subcarriers included in the 16 52-tone DRUs. However, the actual indexes of the corresponding pilot subcarriers may not be uniformly distributed. This is because after arranging the subcarriers included in the 16 52-tone DRUs in order of frequency from low to high (or in order of frequency from high to low), there may be discontinuous subcarrier indices. For example, in the merged subcarriers, every 32 subcarriers, four subcarriers are missing, and the index difference between the adjacent pilot subcarriers at both ends of the missing subcarriers is 15.

[0583] In this embodiment, considering the potential distortion caused by radio frequency devices near the protection zone and DC zone, the two outermost and middle subcarriers in the DRU are avoided as pilot subcarriers. Simultaneously, for the 80MHz subcarrier division in Table 11 or Table 13, appropriate values ​​are selected to minimize the number of 52-tone DRU types and to ensure that the pilot subcarriers are approximately uniformly distributed in the lower and upper half-band frequencies.

[0584] For example, taking the subcarrier indices of each 52-tone DRU shown in Table 11 as an example, c1=32, c2=224, c3=448, c4=640, the indices of these 64 pilot subcarriers can be:

[0585] [-452,-437,-426,-411,-400,-389,-374,-363,-352,-337,-326,-315,-300,-289,-278,-263,-236,-221,-210,-195,-184,-173,-158,-147,-136,-121,-110,-99, -84,-73,-62,-47,48,63,74,89,100,111,126,137,148,163,174,185,200,211,222,237,264,279,290,305,316,327,342,353,364,379,390,401,416,427,438,453).

[0586] Taking the subcarrier indices of each 52-tone DRU shown in Table 11 as an example, for 16 52-tone DRUs, the subcarrier index at position 32 is -452, the subcarrier index at position 33 is -447, the subcarrier index at position 43 is -437, and so on, with the subcarrier index at position 197 being -263. The subcarrier index at position 224 is -236, and so on, without further listing. Other values ​​for c1, c2, c3, and c4 are not listed here. This embodiment of the application does not limit the index of the pilot subcarriers corresponding to the relative positions of each DRU. The index of the pilot subcarriers can change with the index range of each DRU.

[0587] For example, taking Table 11 below as an example, the index of the pilot subcarriers of each 52-tone DRU can be as follows:

[0588] The index of the pilot subcarrier of 52-tone DRU 1 is [-411,-195,89,305];

[0589] The index of the pilot subcarrier of 52-tone DRU 2 is [-315, -99, 185, 401];

[0590] The index of the pilot subcarrier of 52-tone DRU 3 is [-263, -47, 237, 453];

[0591] The index of the pilot subcarrier of 52-tone DRU 4 is [-363, -147, 137, 353];

[0592] The index of the pilot subcarrier of 52-tone DRU 5 is [-389, -173, 111, 327];

[0593] The index of the pilot subcarrier of 52-tone DRU 6 is [-289, -73, 211, 427];

[0594] The index of the pilot subcarrier of 52-tone DRU 7 is [-337, -121, 163, 379];

[0595] The index of the pilot subcarrier of 52-tone DRU 8 is [-437, -221, 63, 279];

[0596] The index of the pilot subcarrier of the 52-tone DRU 9 is [-374, -158, 126, 342];

[0597] The indexes of the pilot subcarriers of the 52-tone DRU 10 are [-278, -62, 222, 438];

[0598] The index of the pilot subcarrier of 52-tone DRU 11 is [-426, -210, 74, 290];

[0599] The index of the pilot subcarrier of the 52-tone DRU 12 is [-326, -110, 174, 390];

[0600] The index of the pilot subcarrier of 52-tone DRU 13 is [-352, -136, 148, 364];

[0601] The index of the pilot subcarrier of 52-tone DRU 14 is [-452, -236, 48, 264];

[0602] The index of the pilot subcarrier of the 52-tone DRU 15 is [-300, -84, 200, 416];

[0603] The index of the pilot subcarrier of the 52-tone DRU 16 is [-400, -184, 100, 316].

[0604] For example, taking the subcarrier indices of each 52-tone DRU shown in Table 13 as an example, c1=32, c2=224, c3=448, c4=640, the indices of these 64 pilot subcarriers can be:

[0605] [-440,-429,-418,-407,-396,-385,-366,-355,-344,-333,-322,-311,-300,-289,-278,-267,-240,-229,-218,-207,-196,-185,-174,-163,-152,-133,-122,-111,- 100,-89,-78,-67,72,83,94,105,116,127,146,157,168,179,190,201,212,223,234,245,272,283,294,305,316,327,338,349,360,379,390,401,412,423,434,445).

[0606] Taking the subcarrier indices of each 52-tone DRU shown in Table 13 as an example, for the 16 52-tone DRUs, the subcarrier index at position 32 is -440, the subcarrier index at position 33 is -429, the subcarrier index at position 43 is -418, and so on. The subcarrier index at position 197 is -267, and the subcarrier index at position 224 is -240, and so on. Other values ​​for c1, c2, c3, and c4 are not listed here.

[0607] For example, taking Table 13 below as an example, the index of the pilot subcarriers of each 52-tone DRU can be as follows:

[0608] The index of the pilot subcarrier of 52-tone DRU 1 is [-407, -207, 105, 305];

[0609] The index of the pilot subcarrier of 52-tone DRU 2 is [-311,-111,201,401];

[0610] The index of the pilot subcarrier of 52-tone DRU 3 is [-267, -67, 245, 445];

[0611] The index of the pilot subcarrier of 52-tone DRU 4 is [-355, -163, 157, 349];

[0612] The index of the pilot subcarrier of 52-tone DRU 5 is [-385, -185, 127, 327];

[0613] The index of the pilot subcarrier of 52-tone DRU 6 is [-289, -89, 223, 423];

[0614] The index of the pilot subcarrier of 52-tone DRU 7 is [-333, -133, 179, 379];

[0615] The index of the pilot subcarrier of 52-tone DRU 8 is [-429, -229, 83, 283];

[0616] The index of the pilot subcarrier of the 52-tone DRU 9 is [-366, -174, 146, 338];

[0617] The index of the pilot subcarrier of 52-tone DRU 10 is [-278, -78, 234, 434];

[0618] The index of the pilot subcarrier of 52-tone DRU 11 is [-418, -218, 94, 294];

[0619] The index of the pilot subcarrier of the 52-tone DRU 12 is [-322,-122,190,390];

[0620] The index of the pilot subcarrier of 52-tone DRU 13 is [-344, -152, 168, 360];

[0621] The index of the pilot subcarrier of 52-tone DRU 14 is [-440, -240, 72, 272];

[0622] The index of the pilot subcarrier of the 52-tone DRU 15 is [-300, -100, 212, 412];

[0623] The index of the pilot subcarrier of the 52-tone DRU 16 is [-396, -196, 116, 316].

[0624] In this embodiment, pilot subcarriers for different DRUs are designed under an 80MHz bandwidth, so that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 52-tone DRUs, 52-tone DRU1 and 52-tone DRU16 belong to the same type, 52-tone DRU3 and 52-tone DRU14 belong to the same type, 52-tone DRU4 and 52-tone DRU13 belong to the same type, 52-tone DRU5 and 52-tone DRU12 belong to the same type, and 52-tone DRU6 and 52-tone DRU11 belong to the same type. This can reduce the implementation complexity of subcarrier mapping and demapping, and simplify the design of DRU LTF sequences.

[0625] 4B, 106-tone DRU

[0626] Among 106-tone DRU 1 to 106-tone DRU 8, there can be two DRUs that satisfy:

[0627] The relative positions of the pilot subcarriers in the first DRU within the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers in the second DRU within the second DRU. For example, in ascending frequency order, the X1, X2, X3, and X4 subcarriers in the first DRU are pilot subcarriers. In descending frequency order, the X1, X2, X3, and X4 subcarriers in the second DRU are pilot subcarriers; or, in ascending frequency order, the X1, X2, X3, and X4 subcarriers in the second DRU are pilot subcarriers. Here, X1, X2, X3, and X4 are distinct integers.

[0628] The conditions that the pilot subcarriers of a 106-tone DRU must meet can be found in the description of a 52-tone DRU in 4A, which will not be elaborated here.

[0629] As one possible implementation, the pilot subcarriers of a 106-tone DRU can be designed in conjunction with the 52-tone DRU shown in section 4A above. For example, a 106-tone DRU can include two 52-tone DRUs, and the pilot subcarriers of this 106-tone DRU can be four of the eight pilot subcarriers corresponding to the two 52-tone DRUs. The relationship between the 52-tone DRU and the 106-tone DRU will not be detailed here.

[0630] As another possible implementation, the pilot subcarriers of the 106-tone DRU can be designed separately by combining the conditions in (1) of 4B. The design method for the pilot subcarriers of each of the eight 106-tone DRUs corresponding to 80MHz will not be detailed here.

[0631] As an example, taking Table 11 as an example, the pilot subcarriers of 106-tone DRU 1 can be 4 of the following 8 pilot subcarriers, with indices of [-411, -315, -195, -99, 89, 185, 305, 401]. The pilot subcarriers of 106-tone DRU 2 can be 4 of the following 8 pilot subcarriers, with indices of [-363, -263, -147, -47, 137, 237, 353, 453]. The pilot subcarriers of 106-tone DRU 3 can be 4 of the following 8 pilot subcarriers, with indices of [-389, -289, -173, -73, 111, 211, 327, 427]. The pilot subcarriers of a 106-tone DRU 4 can be four of the following eight pilot subcarriers, with indices of [-437, -337, -221, -121, 63, 163, 279, 379]. The pilot subcarriers of a 106-tone DRU 5 can be four of the following eight pilot subcarriers, with indices of [-374, -278, -158, -62, 126, 222, 342, 438]. The pilot subcarriers of a 106-tone DRU 6 can be four of the following eight pilot subcarriers, with indices of [-426, -326, -210, -110, 74, 174, 290, 390]. The pilot subcarriers of a 106-tone DRU 7 can be four of the following eight pilot subcarriers, with indices of [-452, -352, -236, -136, 48, 148, 264, 364]. The pilot subcarriers of a 106-tone DRU 8 can be four of the following eight pilot subcarriers, with indices of [-400, -300, -184, -84, 100, 200, 316, 416].

[0632] As an example, taking Table 13 as an example, the pilot subcarriers of 106-tone DRU 1 can be 4 of the following 8 pilot subcarriers, with indices of [-407, -311, -207, -111, 105, 201, 305, 401]. The pilot subcarriers of 106-tone DRU 2 can be 4 of the following 8 pilot subcarriers, with indices of [-355, -267, -163, -67, 157, 245, 349, 445]. The pilot subcarriers of 106-tone DRU 3 can be 4 of the following 8 pilot subcarriers, with indices of [-385, -289, -185, -89, 127, 223, 327, 423]. The pilot subcarriers of a 106-tone DRU 4 can be four of the following eight pilot subcarriers, with indices of [-429, -333, -229, -133, 83, 179, 283, 379]. The pilot subcarriers of a 106-tone DRU 5 can be four of the following eight pilot subcarriers, with indices of [-366, -278, -174, -78, 146, 234, 338, 434]. The pilot subcarriers of a 106-tone DRU 6 can be four of the following eight pilot subcarriers, with indices of [-418, -322, -218, -122, 94, 190, 294, 390]. The pilot subcarriers of a 106-tone DRU 7 can be four of the following eight pilot subcarriers, with indices of [-440, -344, -240, -152, 72, 168, 272, 360]. The pilot subcarriers of a 106-tone DRU 8 can be four of the following eight pilot subcarriers, with indices of [-396, -300, -196, -100, 116, 212, 316, 412].

[0633] For the subcarrier index range of each 106-tone DRU, please refer to Table 11 or Table 13 below; for the relative positions of the pilot subcarriers of each 106-tone DRU, please refer to Table 12 or Table 14 below. It is understood that for 52-tone DRUs, the relative positions of the pilot subcarriers of each 52-tone DRU are the same regardless of whether you refer to Table 11 or Table 13. However, for 106-tone DRUs, since a 106-tone DRU also includes two additional single subcarriers, the relative positions of the pilot subcarriers within the 106-tone DRU may change depending on the position of the single subcarriers. This explanation also applies to 242-tone DRUs or 484-tone DRUs, and will not be repeated below. Therefore, for the same c1, c2, c3, and c4, the relative positions are shown in Table 12 and Table 14.

[0634] 4C, 242-tone DRU

[0635] As one possible implementation, the pilot subcarriers of a 242-tone DRU can be designed in conjunction with the 52-tone DRU shown in 4A. For example, a 242-tone DRU can include four 52-tone DRUs. The eight pilot subcarriers in this 242-tone DRU can be eight of the sixteen pilot subcarriers corresponding to these four 52-tone DRUs.

[0636] As another possible implementation, the pilot subcarriers of a 242-tone DRU can be designed in conjunction with the 106-tone DRU shown in 4B. For example, a 242-tone DRU can include two 106-tone DRUs. The eight pilot subcarriers of this 242-tone DRU can be the eight pilot subcarriers corresponding to the two 106-tone DRUs. For the index of the pilot subcarriers of each 242-tone DRU, please refer to the description of the 106-tone DRU in 4C; it will not be detailed here. For the conditions that the pilot subcarriers of the 242-tone DRU must satisfy, please refer to the description of the 52-tone DRU in 4A; it will not be detailed here.

[0637] For the subcarrier indices of each 242-tone DRU, please refer to Table 11 or Table 13 below. For the relative positions of the pilot subcarriers of each 242-tone DRU, please refer to Table 12 or Table 14 below.

[0638] 4D, 484-tone DRU

[0639] As one possible implementation, the pilot subcarriers of a 484-tone DRU can be designed in conjunction with the 52-tone DRU shown in 4A. For example, a 484-tone DRU may include eight 52-tone DRUs. The eight pilot subcarriers in this one 484-tone DRU can be eight of the 32 pilot subcarriers corresponding to these eight 52-tone DRUs.

[0640] As another possible implementation, the pilot subcarriers of a 484-tone DRU can be designed in conjunction with the 106-tone DRU shown in 4B. For example, a 484-tone DRU can include four 106-tone DRUs. The eight pilot subcarriers of this 484-tone DRU can be eight of the sixteen pilot subcarriers corresponding to these four 106-tone DRUs.

[0641] As another possible implementation, the pilot subcarriers of a 484-tone DRU can be designed in conjunction with the 242-tone DRU shown in 4C. For example, a 484-tone DRU can include two 242-tone DRUs. The eight pilot subcarriers of this one 484-tone DRU can be eight of the sixteen pilot subcarriers corresponding to these two 242-tone DRUs. The conditions that the pilot subcarriers of a 484-tone DRU must satisfy can be found in the description of the 52-tone DRU in 4A, and will not be detailed here.

[0642] For the index of the pilot subcarriers of each 484-tone DRU, please refer to the description of the 106-tone DRU in 4C, which will not be detailed here. For the subcarrier index of each 484-tone DRU, please refer to Table 11 or Table 13 below, and for the relative positions of the pilot subcarriers of each 484-tone DRU, please refer to Table 12 or Table 14 below.

[0643] Table 11 illustrates, for example, the relationship between DRUs of different sizes at 80MHz.

[0644] Table 11

[0645] Taking c1=32, c2=224, c3=448, c4=640, and Table 11 as examples, the relative positions of the pilot subcarriers of each DRU corresponding to 80MHz can be shown in Table 12:

[0646] Table 12

[0647] For Table 12, the 10th, 34th, 62nd, and 86th subcarriers in 106-tone DRU 1 are pilot subcarriers, with indices of [-411, -195, 89, 305] for example. The 26th, 50th, 78th, and 102nd subcarriers in 106-tone DRU 2 are pilot subcarriers, with indices of [-263, -47, 237, 453] for example. The 12th, 36th, 64th, and 88th subcarriers in 106-tone DRU 3 are pilot subcarriers, with indices of [-389, -173, 111, 327] for example. In a 106-tone DRU 4, subcarriers 7, 31, 59, and 93 are pilot subcarriers, with indices of [-437, -221, 63, 279]. In a 106-tone DRU 5, subcarriers 14, 38, 66, and 90 are pilot subcarriers, with indices of [-374, -158, 126, 342]. In a 106-tone DRU 6, subcarriers 19, 43, 71, and 95 are pilot subcarriers, with indices of [-326, -110, 174, 390]. In a 106-tone DRU 7, subcarriers 16, 40, 68, and 92 are pilot subcarriers, with indices of [-352, -136, 148, 364] for example. In a 106-tone DRU 8, subcarriers 11, 35, 63, and 87 are pilot subcarriers, with indices of [-400, -184, 100, 316] for example.

[0648] For Table 12, the indexes of the pilot subcarriers for 242-tone DRU 1 can be [-411, -263, -195, -47, 89, 237, 305, 453]. The indexes of the pilot subcarriers for 242-tone DRU 2 can be [-437, -389, -221, -173, 63, 111, 279, 327]. The indexes of the pilot subcarriers for 242-tone DRU 3 can be [-374, -326, -158, -110, 126, 174, 342, 390]. The indexes of the pilot subcarriers for 242-tone DRU 4 can be [-400, -352, -184, -136, 100, 148, 316, 364].

[0649] For Table 12, the pilot subcarriers of 484-tone DRU 1 can be 8 of the following 16 pilot subcarriers, with indices of [-437,-411,-389,-263,-221,-195,-173,-47,63,89,111,237,279,305,327,453]. The pilot subcarriers of 484-tone DRU 2 can be 8 of the following 16 pilot subcarriers, with indices of [-400,-374,-352,-326,-184,-158,-136,-110,100,126,148,174,316,342,364,390]. It is understood that the relative positions of the 106-tone DRU and the 484-tone DRU shown in Table 12 are merely examples.

[0650] Table 13 illustrates, for example, the relationship between different sizes of DRUs at another 80MHz.

[0651] Table 13

[0652] Taking c1=32, c2=224, c3=448, c4=640, and Table 13 as examples, the relative positions of the pilot subcarriers of each DRU corresponding to 80MHz can be shown in Table 14:

[0653] Table 14

[0654] In this embodiment, pilot subcarriers for the DRU with an 80MHz bandwidth are designed so that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 52-tone DRUs, 52-tone DRU1, 52-tone DRU2, and 52-tone DRU16 belong to the same type; 52-tone DRU3 and 52-tone DRU14 belong to the same type; 52-tone DRU4, 52-tone DRU9, and 52-tone DRU13 belong to the same type; 52-tone DRU5, 52-tone DRU7, and 52-tone DRU12 belong to the same type; 52-tone DRU6, 52-tone DRU11, and 52-tone DRU15 belong to the same type; and 52-tone DRU8 and 52-tone DRU10 belong to the same type. For 106-tone DRUs, 106-toneDRU2 and 106-toneDRU7 belong to the same type, and 106-toneDRU3 and 106-toneDRU6 belong to the same type. This effectively reduces the implementation complexity of subcarrier mapping and demapping, while simplifying the design of DRU LTF sequences.

[0655] Implementation Method 5

[0656] The transmission bandwidth is 80MHz. The subcarrier planning corresponding to this transmission bandwidth can include 16 52-tone DRUs, or 8 106-tone DRUs, or 4 242-tone DRUs, or 2 484-tone DRUs. When the transmission bandwidth is 80MHz, the target DRU can be one of the 16 52-tone DRUs, one of the 8 106-tone DRUs, one of the 4 242-tone DRUs, or one of the 2 484-tone DRUs.

[0657] 5A, 52-tone DRU

[0658] 52-tone DRU 1 to 52-tone DRU 16 are distributed in the lower half-band and upper half-band, respectively.

[0659] The above 16 52-tone DRUs can each have two DRUs (the first DRU and the second DRU shown below) that satisfy at least one of the following (1) to (3):

[0660] (1) The relative position of the pilot subcarrier of the first DRU in the first DRU is the same as or symmetrical to the relative position of the pilot subcarrier of the second DRU in the second DRU.

[0661] For an explanation of (1) in 5A, please refer to the above text; it will not be elaborated here.

[0662] (2) For 52-tone DRU 1 to 52-tone DRU 16, the k-th pilot subcarrier of each 52-tone DRU satisfies:

[0663] Where f(n,k) represents the relative position of the k-th pilot subcarrier of the nth 52-tone DRU among 52-tone DRU 1 to 52-tone DRU 16, where n = 1, 2, ..., 16. The relative position among 52-tone DRU 1 to 52-tone DRU 16 can be represented as the relative position of the k-th pilot subcarrier of the nth 52-tone DRU among all subcarriers in the sorted order from low to high frequency. The nth 52-tone DRU shown here is different from the 52-tone DRU numbering. The numbering of the 52-tone DRU corresponding to the nth 52-tone DRU is not limited in this embodiment.

[0664] c k This indicates the relative position of the k-th pilot subcarrier among the 16 52-tone DRUs, where k = 1, 2, 3, 4. For an explanation of the relative positions, please refer to the description above; further details will not be provided here.

[0665] Indicates to Round down. The value of [g(0),g(1),g(2),g(3)] can be any permutation of the four values ​​[0,1,2,3]. The values ​​of g(0),g(1),g(2), andg(3) are all different. There are a total of 24 possible values ​​for g(k), and the following are just examples.

[0666] In this embodiment, the relative positional interval between adjacent pilot subcarriers is 12. 12 and 16 (i.e., the number of 52-tone DRUs) are not coprime, and their greatest common divisor is 4. Therefore, to avoid the k-th pilot subcarrier and the (k+4)-th pilot subcarrier belonging to the same 52-tone DRU, a function is added to the above condition. By adding a function, every four pilot subcarriers can be shifted so that the 16 pilot subcarriers when k=1, k=2, k=3, or k=4 can belong to different 52-tone DRUs.

[0667] Taking the 80MHz subcarrier division shown in Table 11 as an example, it contains 16 52-tone DRUs. The subcarriers of these 16 52-tone DRUs are arranged in ascending frequency order. These indices are discontinuous in either the upper or lower half-band, for example, 4 subcarriers are missing every 32 subcarriers. Therefore, when designing pilot subcarriers, these 4 discontinuities can be ignored initially. The subcarrier indices of the 16 52-tone DRUs are merged together, and subcarriers at corresponding positions are evenly extracted as pilot subcarriers in ascending order of index. To maximize the coverage of the pilot subcarriers, one subcarrier can be selected every 12 subcarriers. Since 12 and the number of 52-tone DRUs (16) are not coprime, every 4 extracted pilot subcarriers can be shifted to ensure that each DRU has a pilot subcarrier.

[0668] (3)c k It can be determined by the subcarrier index range corresponding to the k-th pilot subcarrier. For example, the value of c1 can be less than 13*16, the value of c2 can be less than 13*2*16, the value of c3 can be less than 13*3*16, and the value of c4 can be less than 13*4*16.

[0669] For an explanation of (3) in 5A, please refer to the description in 4A. It will not be elaborated here.

[0670] In this embodiment of the application, the relative positions of the pilot subcarriers designed under the above conditions in 52-tone DRU 1 to 52-tone DRU 16 are not completely uniformly distributed. However, since the values ​​of [g(0), g(1), g(2), g(3)] are all less than or equal to 3, it can still be considered that the pilot subcarriers shown in this embodiment of the application are approximately uniformly distributed.

[0671] For further explanation of 5A, please refer to 4A; it will not be repeated here.

[0672] For example, taking the DRU subcarrier division shown in Table 11 as an example, c1 = 23, c2 = 215, c3 = 439, c4 = 631, and [g(0), g(1), g(2), g(3)] = [0, 1, 2, 3]. The indices of the 64 pilot subcarriers are:

[0673] [-461,-445,-433,-421,-404,-392,-380,-364,-351,-335,-323,-311,-294,-282,-266,-254,-245,-229,-217,-205,-188,-176,-164,-148,-135,-119,-107,-95, -78,-66,-50,-38,39,55,67,79,96,108,120,136,149,165,177,189,206,218,234,246,255,271,283,295,312,324,336,352,365,381,393,405,422,434,450,462).

[0674] For example, taking Table 11 below as an example, the index of the pilot subcarriers of each 52-tone DRU can be as follows:

[0675] The index of the pilot subcarrier of 52-tone DRU 1 is [-323, -107, 177, 393];

[0676] The index of the pilot subcarrier of 52-tone DRU 2 is [-351, -135, 149, 365];

[0677] The index of the pilot subcarrier of 52-tone DRU 3 is [-335, -119, 165, 381];

[0678] The index of the pilot subcarrier of 52-tone DRU 4 is [-311, -95, 189, 405];

[0679] The index of the pilot subcarrier of 52-tone DRU 5 is [-461,-245,39,255];

[0680] The index of the pilot subcarrier of 52-tone DRU 6 is [-433, -217, 67, 283];

[0681] The index of the pilot subcarrier of 52-tone DRU 7 is [-445, -229, 55, 271];

[0682] The index of the pilot subcarrier of 52-tone DRU 8 is [-421,-205,79,295];

[0683] The index of the pilot subcarrier of the 52-tone DRU 9 is [-266, -50, 234, 450];

[0684] The index of the pilot subcarrier of 52-tone DRU 10 is [-294, -78, 206, 422];

[0685] The index of the pilot subcarrier of 52-tone DRU 11 is [-282, -66, 218, 434];

[0686] The indexes of the pilot subcarriers of the 52-tone DRU 12 are [-254, -38, 246, 462];

[0687] The index of the pilot subcarrier of 52-tone DRU 13 is [-404, -188, 96, 312];

[0688] The index of the pilot subcarrier of the 52-tone DRU 14 is [-380, -164, 120, 336];

[0689] The index of the pilot subcarrier of the 52-tone DRU 15 is [-392, -176, 108, 324];

[0690] The index of the pilot subcarrier of the 52-tone DRU 16 is [-364, -148, 136, 352].

[0691] Taking the DRU subcarrier division shown in Table 13 as an example, c1 = 23, c2 = 215, c3 = 439, c4 = 631, and [g(0), g(1), g(2), g(3)] = [0, 1, 2, 3]. The indices of the 64 pilot subcarriers are:

[0692] [-449,-437,-425,-413,-400,-388,-376,-356,-343,-331,-319,-307,-294,-282,-270,-258,-249,-237,-225,-213,-200,-188,-176,-164,-151,-131,-119,-107, -94,-82,-70,-58,63,75,87,99,112,124,136,156,169,181,193,205,218,230,242,254,263,275,287,299,312,324,336,348,361,381,393,405,418,430,442,454).

[0693] For example, taking Table 13 below as an example, the index of the pilot subcarriers of each 52-tone DRU can be as follows:

[0694] The index of the pilot subcarrier of 52-tone DRU 1 is [-319, -119, 193, 393];

[0695] The index of the pilot subcarrier of 52-tone DRU 2 is [-343, -151, 169, 361];

[0696] The index of the pilot subcarrier of 52-tone DRU 3 is [-331, -131, 181, 381];

[0697] The indexes of the pilot subcarriers of 52-tone DRU 4 are [-307, -107, 205, 405];

[0698] The index of the pilot subcarrier of 52-tone DRU 5 is [-449, -249, 63, 263];

[0699] The index of the pilot subcarrier of 52-tone DRU 6 is [-425, -225, 87, 287];

[0700] The index of the pilot subcarrier of 52-tone DRU 7 is [-437, -237, 75, 275];

[0701] The index of the pilot subcarrier of 52-tone DRU 8 is [-413, -213, 99, 299];

[0702] The index of the pilot subcarrier of the 52-tone DRU 9 is [-270, -70, 242, 442];

[0703] The index of the pilot subcarrier of 52-tone DRU 10 is [-294, -94, 218, 418];

[0704] The index of the pilot subcarrier of 52-tone DRU 11 is [-282, -82, 230, 430];

[0705] The index of the pilot subcarrier of the 52-tone DRU 12 is [-258, -58, 254, 454];

[0706] The index of the pilot subcarrier of 52-tone DRU 13 is [-400, -200, 112, 312];

[0707] The index of the pilot subcarrier of 52-tone DRU 14 is [-376, -176, 136, 336];

[0708] The index of the pilot subcarrier of the 52-tone DRU 15 is [-388, -188, 124, 324];

[0709] The index of the pilot subcarrier of the 52-tone DRU 16 is [-356, -164, 156, 348].

[0710] In this embodiment, pilot subcarriers for different DRUs are designed within an 80MHz bandwidth, ensuring that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 52-tone DRUs, 52-tone DRU1, 52-tone DRU4, and 52-tone DRU13 belong to the same type; 52-tone DRU3, 52-tone DRU14, and 52-tone DRU15 belong to the same type; 52-tone DRU5, 52-tone DRU9, and 52-tone DRU12 belong to the same type; 52-tone DRU6, 52-tone DRU7, and 52-tone DRU11 belong to the same type; and 52-tone DRU8 and 52-tone DRU10 belong to the same type. This reduces the complexity of subcarrier mapping and demapping, while simplifying the design of the DRU LTF sequence.

[0711] 5B, 106-tone DRU

[0712] For details regarding the 106-tone DRU, please refer to 4B; it will not be elaborated here. For the conditions that the pilot subcarriers of the 106-tone DRU must meet, please refer to the description of the 52-tone DRU in 5A; it will not be elaborated here.

[0713] As an example, taking Table 11 as an example, the pilot subcarriers of 106-tone DRU 1 can be 4 of the following 8 pilot subcarriers, with indices of [-351, -323, -135, -107, 149, 177, 365, 393]. The pilot subcarriers of 106-tone DRU 2 can be 4 of the following 8 pilot subcarriers, with indices of [-335, -311, -119, -95, 165, 189, 381, 405]. The pilot subcarriers of 106-tone DRU 3 can be 4 of the following 8 pilot subcarriers, with indices of [-461, -433, -245, -217, 39, 67, 255, 283]. The pilot subcarriers of a 106-tone DRU 4 can be four of the following eight pilot subcarriers, with indices of [-445, -421, -229, -205, 55, 79, 271, 295]. The pilot subcarriers of a 106-tone DRU 5 can be four of the following eight pilot subcarriers, with indices of [-294, -266, -78, -50, 206, 234, 422, 450]. The pilot subcarriers of a 106-tone DRU 6 can be four of the following eight pilot subcarriers, with indices of [-282, -254, -66, -38, 218, 246, 434, 462]. The pilot subcarriers of a 106-tone DRU 7 can be four of the following eight pilot subcarriers, with indices of [-404, -380, -188, -164, 96, 120, 312, 336]. The pilot subcarriers of a 106-tone DRU 8 can be four of the following eight pilot subcarriers, with indices of [-392, -364, -176, -148, 108, 136, 324, 352].

[0714] As another example, taking Table 13 as an example, the pilot subcarriers of 106-tone DRU 1 can be 4 of the following 8 pilot subcarriers, with indices of [-343, -319, -151, -119, 169, 193, 361, 393]. The pilot subcarriers of 106-tone DRU 2 can be 4 of the following 8 pilot subcarriers, with indices of [-331, -307, -131, -107, 181, 205, 381, 405]. The pilot subcarriers of 106-tone DRU 3 can be 4 of the following 8 pilot subcarriers, with indices of [-449, -425, -249, -225, 63, 87, 263, 287]. The pilot subcarriers of a 106-tone DRU 4 can be four of the following eight pilot subcarriers, with indices of [-437, -413, -237, -213, 75, 99, 275, 299]. The pilot subcarriers of a 106-tone DRU 5 can be four of the following eight pilot subcarriers, with indices of [-294, -270, -94, -70, 218, 242, 418, 442]. The pilot subcarriers of a 106-tone DRU 6 can be four of the following eight pilot subcarriers, with indices of [-282, -258, -82, -58, 230, 254, 430, 454]. The pilot subcarriers of a 106-tone DRU 7 can be four of the following eight pilot subcarriers, with indices of [-400, -376, -200, -176, 112, 136, 312, 336]. The pilot subcarriers of a 106-tone DRU 8 can be four of the following eight pilot subcarriers, with indices of [-388, -356, -188, -164, 124, 156, 324, 348].

[0715] For the subcarrier index range of each 106-tone DRU, please refer to Table 11 or Table 13 below. For the relative positions of the pilot subcarriers of each 106-tone DRU, please refer to Table 15 or Table 16 below.

[0716] 5C, 242-tone DRU

[0717] For details regarding the 242-tone DRU, please refer to 4C; it will not be elaborated here. For the conditions that the pilot subcarriers of the 242-tone DRU must meet, please refer to the description of the 52-tone DRU in 5A; it will not be elaborated here.

[0718] For the subcarrier index of each 242-tone DRU, please refer to Table 11 or Table 13 below. For the relative positions of the pilot subcarriers of each 242-tone DRU, please refer to Table 15 or Table 16 below.

[0719] 5D, 484-tone DRU

[0720] For details on the 484-tone DRU, please refer to 4D; it will not be elaborated here. For the conditions that the pilot subcarriers of the 484-tone DRU must meet, please refer to the description of the 52-tone DRU in 5A; it will not be elaborated here.

[0721] For the subcarrier index of each 484-tone DRU, please refer to Table 11 or Table 13 below. For the relative positions of the pilot subcarriers of each 484-tone DRU, please refer to Table 15 or Table 16 below.

[0722] Taking c1=23, c2=215, c3=439, c4=631 as an example, the relative positions of the pilot subcarriers of each DRU corresponding to 80MHz can be shown in Table 15:

[0723] Table 15

[0724] The following uses the index ranges shown in Table 11 as examples to illustrate the indexes of the pilot subcarriers corresponding to the relative positions in Table 15:

[0725] The index of the pilot subcarrier of 106-tone DRU 1 is [-351, -135, 149, 365];

[0726] The index of the pilot subcarrier of 106-tone DRU 2 is [-335, -119, 165, 381];

[0727] The index of the pilot subcarrier of 106-tone DRU 3 is [-433, -217, 67, 283];

[0728] The index of the pilot subcarrier of 106-tone DRU 4 is [-445, -229, 55, 271];

[0729] The index of the pilot subcarrier of 106-tone DRU 5 is [-294, -78, 206, 422];

[0730] The index of the pilot subcarrier of 106-tone DRU 6 is [-282, -66, 218, 434];

[0731] The index of the pilot subcarrier of 106-tone DRU 7 is [-380, -164, 120, 336];

[0732] The index of the pilot subcarrier of 106-tone DRU 8 is [-392, -176, 108, 324].

[0733] The index of the pilot subcarrier of 242-tone DRU 1 can be [-351,-335,-135,-119,149,165,365,381];

[0734] The index of the pilot subcarrier of 242-tone DRU 2 can be [-445,-433,-229,-217,55,67,271,283];

[0735] The index of the pilot subcarrier of 242-tone DRU 3 can be [-294,-282,-78,-66,206,218,422,434];

[0736] The index of the pilot subcarrier of 242-tone DRU 4 can be [-392, -380, -176, -164, 108, 120, 324, 336].

[0737] For Table 15, the pilot subcarriers of 484-tone DRU 1 can be 8 of the following 16 pilot subcarriers, with indices of [-445, -433, -351, -335, -229, -217, -135, -119, 55, 67, 149, 165, 271, 283, 365, 381]. The pilot subcarriers of 484-tone DRU 2 can be 8 of the following 16 pilot subcarriers, with indices of [-392, -380, -294, -282, -176, -164, -78, -66, 108, 120, 206, 218, 324, 336, 422, 434]. As shown in Table 15, the pilot subcarrier indices for 484-tone DRU 1 are [-445, -351, -229, -135, 55, 149, 271, 365], and the pilot subcarrier indices for 484-tone DRU 2 are [-392, -294, -176, -78, 108, 206, 324, 422]. It should be understood that the relative positions of the 106-tone DRU and the 484-tone DRU shown in Table 15 are merely examples.

[0738] Taking c1=23, c2=215, c3=439, c4=631 and Table 13 as examples, the relative positions of the pilot subcarriers of each DRU corresponding to 80MHz can be shown in Table 16:

[0739] Table 16

[0740] The following uses the index ranges shown in Table 13 as examples to illustrate the indexes of the pilot subcarriers corresponding to the relative positions in Table 16:

[0741] The index of the pilot subcarrier of 106-tone DRU 1 is [-319, -119, 193, 393];

[0742] The indexes of the pilot subcarriers of 106-tone DRU 2 are [-331, -131, 181, 381];

[0743] The index of the pilot subcarrier of 106-tone DRU 3 is [-449, -249, 63, 263];

[0744] The index of the pilot subcarrier of 106-tone DRU 4 is [-413, -213, 99, 299];

[0745] The index of the pilot subcarrier of 106-tone DRU 5 is [-294, -94, 218, 418];

[0746] The index of the pilot subcarrier of 106-tone DRU 6 is [-258, -58, 254, 454];

[0747] The index of the pilot subcarrier of 106-tone DRU 7 is [-376, -176, 136, 336];

[0748] The index of the pilot subcarrier of 106-tone DRU 8 is [-388, -188, 124, 324].

[0749] The index of the pilot subcarrier of 242-tone DRU 1 can be [-331,-319,-131,-119,181,193,381,393];

[0750] The index of the pilot subcarrier of 242-tone DRU 2 can be [-449,-413,-249,-213,63,99,263,299];

[0751] The index of the pilot subcarrier of 242-tone DRU 3 can be [-294,-258,-94,-58,218,254,418,454];

[0752] The index of the pilot subcarrier of 242-tone DRU 4 can be [-388, -376, -188, -176, 124, 136, 324, 336].

[0753] For Table 16, the pilot subcarriers of 484-tone DRU 1 can be 8 of the following 16 pilot subcarriers, with indices of [-449,-413,-331,-319,-249,-213,-131,-119,63,99,181,193,263,299,381,393]. The pilot subcarriers of 484-tone DRU 2 can be 8 of the following 16 pilot subcarriers, with indices of [-388,-376,-294,-258,-188,-176,-94,-58,124,136,218,254,324,336418,454]. As shown in Table 16, the pilot subcarrier indices for 484-tone DRU 1 are [-449, -331, -249, -131, 63, 181, 263, 381], and the pilot subcarrier indices for 484-tone DRU 2 are [-388, -294, -188, -94, 124, 218, 324, 418]. It should be understood that the relative positions of the 106-tone DRUs and 484-tone DRUs shown in Table 16 are merely examples.

[0754] In this embodiment, pilot subcarriers for the DRU with an 80MHz bandwidth are designed so that the pilot subcarriers are approximately uniformly distributed within the bandwidth. For 52-tone DRUs, 52-tone DRU1, 52-tone DRU4, and 52-tone DRU13 belong to the same type; 52-tone DRU3, 52-tone DRU14, and 52-tone DRU15 belong to the same type; 52-tone DRU5, 52-tone DRU9, and 52-tone DRU12 belong to the same type; 52-tone DRU6, 52-tone DRU7, and 52-tone DRU11 belong to the same type; 52-tone DRU8 and 52-tone DRU10 belong to the same type; and 52-tone DRU2 and 52-tone DRU16 belong to the same type. For 106-tone DRUs, 106-toneDRU2 and 106-toneDRU7 belong to the same type, and 106-toneDRU3 and 106-toneDRU6 belong to the same type. This effectively reduces the implementation complexity of subcarrier mapping and demapping, while simplifying the design of DRU LTF sequences.

[0755] With a transmission bandwidth of 160MHz, the subcarrier planning corresponding to this bandwidth can include 32 52-tone DRUs, 16 106-tone DRUs, 8 242-tone DRUs, 4 484-tone DRUs, or 2 996-tone DRUs. When the transmission bandwidth is 160MHz, the target DRU can be one of the 32 52-tone DRUs, one of the 16 106-tone DRUs, one of the 8 242-tone DRUs, one of the 4 484-tone DRUs, or one of the 2 996-tone DRUs.

[0756] When the transmission bandwidth is 320MHz, the corresponding subcarrier planning is not listed here.

[0757] For the subcarrier planning related to transmission bandwidths of 160MHz or 320MHz, the design ideas of implementation methods one through five can be adapted accordingly, and will not be detailed in this application.

[0758] The index ranges in the tables shown above are merely examples, and the implementation of this application does not limit the index range for each DRU. The relationship between the relative positions in the tables shown above and the pilot subcarrier indices can change as the index range of each DRU changes. The pilot subcarrier indices of each DRU shown above can also be represented by tables or other methods, which will not be listed here.

[0759] In the embodiments of this application, the dashed lines in the accompanying drawings can be understood as optional.

[0760] The following describes the communication device provided in the embodiments of this application.

[0761] This application divides the communication device into functional modules according to the above method embodiments. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated modules can be implemented in hardware or as software functional modules. It should be noted that the module division in this application is illustrative and only represents one logical functional division; other division methods may be used in actual implementation. The communication device of the embodiments of this application will be described in detail below with reference to Figures 7 to 9.

[0762] Figure 7 is a schematic diagram of a communication device provided in an embodiment of this application. As shown in Figure 7, the communication device includes a processing module 701 and a transceiver module 702. The transceiver module 702 can implement corresponding communication functions, and the processing module 701 is used to implement corresponding processing functions. For example, the transceiver module 702 can also be called an interface, a communication interface, or a communication module, etc.

[0763] In some embodiments of this application, the communication device can be used to perform the actions performed by the first communication device in the above method embodiments. In this case, the first communication device can be the Wi-Fi device itself or a chip or functional module configurable in the device. The transceiver module 702 is used to perform the transceiver-related operations of the first communication device in the above method embodiments, and the processing module 701 is used to perform the processing-related operations of the first communication device in the above method embodiments.

[0764] Processing module 701 can be used to generate OFDM symbols; transceiver module 702 can be used to transmit or output the OFDM symbols on the transmission bandwidth. The subcarrier planning corresponding to the transmission bandwidth is described above.

[0765] For example, processing module 701 may include at least one of the following modules: constellation mapping module, stream cyclic shifting module, space-frequency mapping module, IDFT module, cyclic prefix insertion and windowing module. For example, transceiver module 702 may include radio frequency module, antenna module, etc. For example, transceiver module 702 may include pin module, etc.

[0766] Reusing Figure 7, in some other embodiments of this application, the communication device can be used to perform the actions performed by the second communication device in the above method embodiments. In this case, the communication device can be the Wi-Fi device itself or a chip or functional module configurable in the device. The transceiver module 702 is used to perform the transceiver-related operations of the second communication device in the above method embodiments, and the processing module 701 is used to perform the processing-related operations of the second communication device in the above method embodiments.

[0767] The transceiver module 702 can be used to receive or input OFDM symbols; the processing module 701 can be used to parse the OFDM symbols.

[0768] For example, processing module 701 may include at least one of the following components: a cyclic prefix removal module, a DFT module, a deinterleaving module, a deconstellation module, and a descrambling module. For example, transceiver module 702 may include an RF module, an antenna module, etc. For example, transceiver module 702 may include a pin module, etc.

[0769] Optionally, in the above embodiments, the communication device may further include a storage module, which can be used to store instructions and / or data. The processing module 701 can read the instructions and / or data from the storage module to enable the communication device to implement the aforementioned method embodiments. For example, the storage module may store subcarrier planning, etc., as shown above.

[0770] For details regarding the specific explanations of each term, noun, or step in the above embodiments, please refer to the descriptions in the above method embodiments; they will not be detailed here.

[0771] The specific descriptions of the transceiver module and processing module shown in the above embodiments are merely examples. For the specific functions or execution steps of the transceiver module and processing module, please refer to the above method embodiments, which will not be described in detail here.

[0772] The communication device according to the embodiments of this application has been described above. The possible product forms of the communication device are described below. Any product possessing the functions of the communication device described in FIG. 7 above falls within the protection scope of the embodiments of this application. The following description is merely illustrative and does not limit the product form of the communication device according to the embodiments of this application to this extent.

[0773] In one possible implementation, in the communication device shown in FIG7, the processing module 701 can be one or more processors, and the transceiver module 702 can be a transceiver, or the transceiver module 702 can also be a transmitting module and a receiving module. The transmitting module can be a transmitter, and the receiving module can be a receiver. The transmitting module and the receiving module are integrated into one device, such as a transceiver. In the embodiments of this application, the processor and the transceiver can be coupled, etc., and the connection method of the processor and the transceiver is not limited in the embodiments of this application. In the process of executing the above method, the process of sending information in the above method can be the process of the processor outputting the above information. When outputting the above information, the processor outputs the above information to the transceiver so that the transceiver can transmit it. After the above information is output by the processor, it may need to undergo other processing before reaching the transceiver. Similarly, the process of receiving information in the above method can be the process of the processor receiving the input above information. When the processor receives the input information, the transceiver receives the above information and inputs it into the processor. Furthermore, after the transceiver receives the above information, the above information may need to undergo other processing before being input into the processor.

[0774] As shown in Figure 8, the communication device 80 includes one or more processors 820 and transceivers 810.

[0775] In some embodiments of this application, the communication device can be used to execute the steps, methods, or functions performed by the first communication device described above. For example, the processor 820 can be used to execute the functions or steps implemented by the processing module 701 shown in FIG. 7, and the transceiver 810 can be used to execute the functions or steps implemented by the transceiver module 702 shown in FIG. 7. Detailed descriptions of the processor 820 and the transceiver 810 can be found in FIG. 7 or the method embodiments shown above, and will not be elaborated further here.

[0776] In other embodiments of this application, the communication device is used to execute the steps, methods, or functions executed by the second communication device described above. For example, the processor 820 can be used to execute the functions or steps implemented by the processing module 701 shown in FIG. 7, and the transceiver 810 can be used to execute the functions or steps implemented by the transceiver module 702 shown in FIG. 7. Detailed descriptions of the processor 820 and the transceiver 810 can be found in FIG. 7 or the method embodiments shown above, and will not be elaborated further here.

[0777] In various implementations of the communication device shown in Figure 8, the transceiver may include a receiver for performing a receiving function (or operation) and a transmitter for performing a transmitting function (or operation). The transceiver is also used to communicate with other devices / appliances via a transmission medium.

[0778] Optionally, the communication device 80 may further include one or more memories 830 for storing program instructions and / or data. The memory 830 is coupled to the processor 820. The coupling in this embodiment is an indirect coupling or communication connection between communication devices, units, or modules, and can be electrical, mechanical, or other forms, used for information exchange between the communication devices, units, or modules. The processor 820 may operate in conjunction with the memory 830. The processor 820 may execute program instructions stored in the memory 830. Optionally, at least one of the above-mentioned memories may be included in the processor.

[0779] This application embodiment does not limit the specific connection medium between the transceiver 810, processor 820, and memory 830. In this application embodiment, the memory 830, processor 820, and transceiver 810 are connected via a bus 840 in Figure 8. The bus is represented by a thick line in Figure 8. The connection methods between other components are only for illustrative purposes and are not intended to be limiting. The bus can be divided into address bus, data bus, control bus, etc. For ease of illustration, only one thick line is used in Figure 8, but this does not mean that there is only one bus or one type of bus.

[0780] In the embodiments of this application, the processor may be a general-purpose processor, a digital signal processor, an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc., and can implement or execute the various methods, steps, and logic block diagrams disclosed in the embodiments of this application. The general-purpose processor may be a microprocessor or any conventional processor. The steps of the methods disclosed in the embodiments of this application can be directly manifested as being executed by a hardware processor, or being executed by a combination of hardware and software modules within the processor.

[0781] In this application embodiment, the memory may include, but is not limited to, non-volatile memory such as hard disk drive (HDD) or solid-state drive (SSD), random access memory (RAM), erasable programmable read-only memory (EPROM), read-only memory (ROM), or compact disc read-only memory (CD-ROM), etc. Memory is any storage medium capable of carrying or storing program code having instruction or data structure forms, and capable of being read and / or written by a computer (such as the communication device shown in this application), but is not limited to this. The memory in this application embodiment may also be a circuit or any other device capable of implementing storage functions, used to store program instructions and / or data.

[0782] The processor 820 is primarily used for processing communication protocols and data, controlling the entire communication device, executing software programs, and processing software program data. The memory 830 is primarily used for storing software programs and data. The transceiver 810 may include control circuitry and an antenna. The control circuitry is primarily used for converting baseband signals to radio frequency signals and processing radio frequency signals. The antenna is primarily used for transmitting and receiving radio frequency signals in the form of electromagnetic waves. Input / output devices, such as touchscreens, displays, and keyboards, are primarily used for receiving user input data and outputting data to the user.

[0783] When the communication device is powered on, the processor 820 can read the software program in the memory 830, interpret and execute the instructions of the software program, and process the data of the software program. When data needs to be transmitted wirelessly, the processor 820 performs baseband processing on the data to be transmitted and outputs the baseband signal to the radio frequency (RF) circuit. The RF circuit processes the baseband signal and transmits the RF signal outward in the form of electromagnetic waves through the antenna. When data is sent to the communication device, the RF circuit receives the RF signal through the antenna, converts the RF signal into a baseband signal, and outputs the baseband signal to the processor 820. The processor 820 converts the baseband signal into data and processes the data.

[0784] In another implementation, the radio frequency circuitry and antenna can be set up independently of the processor performing baseband processing. For example, in a distributed scenario, the radio frequency circuitry and antenna can be arranged remotely, independent of the communication device.

[0785] The communication device shown in this application embodiment may also have more components than those in Figure 8, and this application embodiment does not limit this. The methods executed by the processor and transceiver shown above are only examples, and the specific steps executed by the processor and transceiver can be referred to the methods described above.

[0786] In another possible implementation, in the communication device shown in Figure 7, the processing module 701 can be one or more logic circuits, and the transceiver module 702 can be an input / output interface, or a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver module 702 can also be a transmitting module and a receiving module. The transmitting module can be an output interface, and the receiving module can be an input interface. The transmitting module and the receiving module are integrated into one module, such as an input / output interface. As shown in Figure 9, the communication device shown in Figure 9 includes a logic circuit 901 and an interface 902. That is, the above-mentioned processing module 701 can be implemented using the logic circuit 901, and the transceiver module 702 can be implemented using the interface 902. Among them, the logic circuit 901 can be a chip, a processing circuit, an integrated circuit, or a system-on-a-chip (SoC) chip, etc., and the interface 902 can be a communication interface, an input / output interface, pins, etc. For example, Figure 9 illustrates the above-mentioned communication device as a chip, which includes the logic circuit 901 and the interface 902.

[0787] In this embodiment, the logic circuit and the interface can also be coupled to each other. The specific connection method of the logic circuit and the interface is not limited in this embodiment. For example, the logic circuit 901 can be used to execute the functions or steps implemented by the processing module 701 shown in FIG. 7, and the interface 902 can be used to execute the functions or steps implemented by the transceiver module 702 shown in FIG. 7. For a detailed description of the logic circuit 901 and the interface 902, please refer to FIG. 7 or the method embodiment shown above, which will not be detailed here.

[0788] The communication device shown in the embodiments of this application can implement the method provided in the embodiments of this application in hardware form, or it can implement the method provided in the embodiments of this application in software form, etc., and the embodiments of this application do not limit it in this way.

[0789] Furthermore, embodiments of this application also provide a communication system, which includes a first communication device and a second communication device, the first communication device and the second communication device being used to execute the methods in any of the foregoing embodiments.

[0790] This application also provides a computer program for implementing the operations and / or processes performed by various communication devices in the methods provided in this application.

[0791] This application also provides a computer-readable storage medium storing computer code that, when executed on a computer, causes the computer to perform the operations and / or processes performed by various communication devices in the methods provided in this application.

[0792] This application also provides a computer program product comprising computer code or a computer program that, when run on a computer, causes the operations and / or processes performed by various entities in the method provided in this application to be executed.

[0793] In the embodiments provided in this application, it should be understood that the disclosed systems, communication devices, and methods can be implemented in other ways. For example, the communication device embodiments described above are merely illustrative. For instance, the division of modules is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be indirect coupling or communication connection through some interfaces, communication devices, or modules, or it may be an electrical, mechanical, or other form of connection.

[0794] 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.

[0795] 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.

[0796] 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.

[0797] 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

1. A communication method, characterized in that, The method includes: Based on the subcarriers corresponding to the transmission bandwidth, plan the transmission or reception of Orthogonal Frequency Division Multiplexing (OFDM) symbols; The subcarrier planning corresponding to the transmission bandwidth includes a first DRU. When the transmission bandwidth is 20MHz or 40MHz, the first DRU is any one of the DRUs with 26 subcarriers in the subcarrier planning corresponding to the transmission bandwidth. When the transmission bandwidth is greater than 40MHz, the first DRU is any one of the DRUs with 52 subcarriers in the subcarrier planning corresponding to the transmission bandwidth. The pilot subcarrier of the first DRU satisfies at least one of the following: The relative positions of pilot subcarriers with indices greater than 0 in the first DRU are symmetrical to the relative positions of pilot subcarriers with indices less than 0 in the first DRU; or, The relative positions of the pilot subcarriers of the first DRU in the first DRU are the same as or symmetrical to the relative positions of the pilot subcarriers of the second DRU in the second DRU. The subcarrier index in the second DRU is different from the subcarrier index in the first DRU, and the number of subcarriers in the first DRU and the number of subcarriers in the second DRU are the same.

2. The method according to claim 1, characterized in that, The transmission bandwidth is 20MHz; The index of the pilot subcarrier of the first DRU includes one of the following indices: a:S:(a+8*S); The index of the pilot subcarrier of the first DRU includes one of the indices in -(a+8*S):S:-a; Where a and S are both positive integers.

3. The method according to claim 2, characterized in that, The first DRU is any one of the following: 26-tone DRU 1, 26-tone DRU 2, 26-tone DRU 3, 26-tone DRU 4, 26-tone DRU 5, 26-tone DRU 6, 26-tone DRU 7, 26-tone DRU 8, and 26-tone DRU 9. Each of the 26-tone DRUs 1 to 9 includes 2 pilot subcarriers, and the 26-tone DRUs 1 to 9 correspond to 18 pilot subcarriers. The index of the pilot subcarriers with an index greater than 0 among the 18 pilot subcarriers is [a:S:(a+8*S)], and the index of the pilot subcarriers with an index less than 0 among the 18 pilot subcarriers is [-(a+8*S):S:-a].

4. The method according to claim 2 or 3, characterized in that, a>12 and a+8*S<112.

5. The method according to any one of claims 2-4, characterized in that, The greatest common divisor of S and 9 is 1.

6. The method according to any one of claims 2-5, characterized in that, The first DRU is one of the 26-tone DRUs 1 to 9; wherein, The index of the pilot subcarrier of the 26-tone DRU 1 is [-30, 96]; The index of the pilot subcarrier of the 26-tone DRU 2 is [-107, 19]; The index of the pilot subcarrier of the 26-tone DRU 3 is [-19, 107]; The index of the pilot subcarrier of the 26-tone DRU 4 is [-96, 30]; The index of the pilot subcarrier of the 26-tone DRU 5 is [-85, 41]; The index of the pilot subcarrier of the 26-tone DRU 6 is [-74, 52]; The index of the pilot subcarrier of the 26-tone DRU 7 is [-52, 74]; The index of the pilot subcarrier of the 26-tone DRU 8 is [-63, 63]; The index of the pilot subcarrier of the 26-tone DRU 9 is [-41, 85]; or, The index of the pilot subcarrier of the 26-tone DRU 1 is [-93, 33]; The index of the pilot subcarrier of the 26-tone DRU 2 is [-53, 73]; The index of the pilot subcarrier of the 26-tone DRU 3 is [-73, 53]; The index of the pilot subcarrier of the 26-tone DRU 4 is [-33, 93]; The index of the pilot subcarrier of the 26-tone DRU 5 is [-103, 23]; The index of the pilot subcarrier of the 26-tone DRU 6 is [-83, 43]; The index of the pilot subcarrier of the 26-tone DRU 7 is [-43, 83]; The index of the pilot subcarrier of the 26-tone DRU 8 is [-63, 63]; The index of the pilot subcarrier of the 26-tone DRU 9 is [-23, 103]; or, The index of the pilot subcarrier of the 26-tone DRU 1 is [-39, 87]; The index of the pilot subcarrier of the 26-tone DRU 2 is [-71, 55]; The index of the pilot subcarrier of the 26-tone DRU 3 is [-55, 71]; The index of the pilot subcarrier of the 26-tone DRU 4 is [-87, 39]; The index of the pilot subcarrier of the 26-tone DRU 5 is [-31, 95]; The index of the pilot subcarrier of the 26-tone DRU 6 is [-47, 79]; The index of the pilot subcarrier of the 26-tone DRU 7 is [-79, 47]; The index of the pilot subcarrier of the 26-tone DRU 8 is [-63, 63]; The index of the pilot subcarrier of the 26-tone DRU 9 is [-95, 31].

7. The method according to claim 1, characterized in that, The transmission bandwidth is 40MHz; The index of the pilot subcarrier of the first DRU includes one index in a:S:(a+17*S); The index of the pilot subcarrier of the first DRU includes one of the indices: -(b+17*S):S:-b; Where a, b, and S are all positive integers.

8. The method according to claim 7, characterized in that, The first DRU is 26-tone DRU 1, 26-tone DRU 2, 26-tone DRU 3, 26-tone DRU 4, 26-tone DRU 5, 26-tone DRU 6, 26-tone DRU 7, 26-tone DRU 8, 26-tone DRU 9, 26-tone DRU 10, 26-tone DRU 11, 26-tone DRU Any DRU among 12, 26-tone DRU 13, 26-tone DRU 14, 26-tone DRU 15, 26-tone DRU 16, 26-tone DRU 17, 26-tone DRU 18; Each of the 26-tone DRUs from 26-tone DRU 1 to 26-tone DRU 18 includes 2 pilot subcarriers, and the 26-tone DRU 1 to 26-tone DRU 18 correspond to 36 pilot subcarriers. The index of the pilot subcarriers with an index greater than 0 among the 36 pilot subcarriers is [a:S:(a+17*S)], and the index of the pilot subcarriers with an index less than 0 among the 18 pilot subcarriers is [-(b+17*S):S:-b].

9. The method according to claim 7 or 8, characterized in that, a>27 and a+17*S<226.

10. The method according to any one of claims 7-9, characterized in that, The difference between a and b is an integer multiple of S.

11. The method according to any one of claims 7-10, characterized in that, The first DRU is one of 26-tone DRU 1 to 26-tone DRU 18; wherein, The index of the pilot subcarrier of the 26-tone DRU 1 is [-170, 82]; The index of the pilot subcarrier of the 26-tone DRU 2 is [-71, 181]; The index of the pilot subcarrier of the 26-tone DRU 3 is [-148, 104]; The index of the pilot subcarrier of the 26-tone DRU 4 is [-49, 203]; The index of the pilot subcarrier of the 26-tone DRU 5 is [-27, 225]; The index of the pilot subcarrier of the 26-tone DRU 6 is [-60, 192]; The index of the pilot subcarrier of the 26-tone DRU 7 is [-159, 93]; The index of the pilot subcarrier of the 26-tone DRU 8 is [-38, 214]; The index of the pilot subcarrier of the 26-tone DRU 9 is [-137, 115]; The index of the pilot subcarrier of the 26-tone DRU 10 is [-115, 137]; The index of the pilot subcarrier of the 26-tone DRU 11 is [-214, 38]; The index of the pilot subcarrier of the 26-tone DRU 12 is [-93, 159]; The index of the pilot subcarrier of the 26-tone DRU 13 is [-192, 60]; The index of the pilot subcarrier of the 26-tone DRU 14 is [-126, 126]; The index of the pilot subcarrier of the 26-tone DRU 15 is [-203, 49]; The index of the pilot subcarrier of the 26-tone DRU 16 is [-104, 148]; The index of the pilot subcarrier of the 26-tone DRU 17 is [-181, 71]; The index of the pilot subcarrier of the 26-tone DRU 18 is [-82, 170].

12. The method according to claim 1, characterized in that, The transmission bandwidth is 80MHz; The first DRU is one of the 52-tone DRU 1 to 52-tone DRU 16; For the 52-tone DRU 1 to the 52-tone DRU 16, the k-th pilot subcarrier of each DRU satisfies: c k :11:(165+c k ) Among them, c k This indicates the relative position of the k-th pilot subcarrier in the 52-tone DRU 1 to the 52-tone DRU 16, where k = 1, 2, 3, 4.

13. The method according to claim 12, characterized in that, The index of the pilot subcarrier of the 52-tone DRU 1 is [-411,-195,89,305]; The index of the pilot subcarrier of the 52-tone DRU 2 is [-315, -99, 185, 401]; The index of the pilot subcarrier of the 52-tone DRU 3 is [-263, -47, 237, 453]; The index of the pilot subcarrier of the 52-tone DRU 4 is [-363, -147, 137, 353]; The index of the pilot subcarrier of the 52-tone DRU 5 is [-389, -173, 111, 327]; The index of the pilot subcarrier of the 52-tone DRU 6 is [-289, -73, 211, 427]; The index of the pilot subcarrier of the 52-tone DRU 7 is [-337, -121, 163, 379]; The index of the pilot subcarrier of the 52-tone DRU 8 is [-437, -221, 63, 279]; The index of the pilot subcarrier of the 52-tone DRU 9 is [-374, -158, 126, 342]; The index of the pilot subcarrier of the 52-tone DRU 10 is [-278, -62, 222, 438]; The index of the pilot subcarrier of the 52-tone DRU 11 is [-426, -210, 74, 290]; The index of the pilot subcarrier of the 52-tone DRU 12 is [-326, -110, 174, 390]; The index of the pilot subcarrier of the 52-tone DRU 13 is [-352,-136,148,364]; The index of the pilot subcarrier of the 52-tone DRU 14 is [-452,-236,48,264]; The index of the pilot subcarrier of the 52-tone DRU 15 is [-300, -84, 200, 416]; The index of the pilot subcarrier of the 52-tone DRU 16 is [-400, -184, 100, 316].

14. The method according to claim 1, characterized in that, The transmission bandwidth is 80MHz; The first DRU is one of the 52-tone DRU 1 to 52-tone DRU 16; For the 52-tone DRU 1 to the 52-tone DRU 16, the k-th pilot subcarrier of each DRU satisfies: Where f(n,k) represents the relative position of the k-th pilot subcarrier of the n-th 52-tone DRU in the 52-tone DRU 1 to the 52-tone DRU 16, n = 1, 2, ..., 16; c k This indicates the relative position of the k-th pilot subcarrier in the 52-tone DRU 1 to the 52-tone DRU 16, where k = 1, 2, 3, 4; Indicates to Round down to the nearest integer.

15. The method according to claim 14, characterized in that, The index of the pilot subcarrier of the 52-tone DRU 1 is [-323, -107, 177, 393]; The index of the pilot subcarrier of the 52-tone DRU 2 is [-351, -135, 149, 365]; The index of the pilot subcarrier of the 52-tone DRU 3 is [-335, -119, 165, 381]; The index of the pilot subcarrier of the 52-tone DRU 4 is [-311,-95,189,405]; The index of the pilot subcarrier of the 52-tone DRU 5 is [-461,-245,39,255]; The index of the pilot subcarrier of the 52-tone DRU 6 is [-433, -217, 67, 283]; The index of the pilot subcarrier of the 52-tone DRU 7 is [-445, -229, 55, 271]; The index of the pilot subcarrier of the 52-tone DRU 8 is [-421,-205,79,295]; The index of the pilot subcarrier of the 52-tone DRU 9 is [-266, -50, 234, 450]; The index of the pilot subcarrier of the 52-tone DRU 10 is [-294, -78, 206, 422]; The index of the pilot subcarrier of the 52-tone DRU 11 is [-282, -66, 218, 434]; The index of the pilot subcarrier of the 52-tone DRU 12 is [-254, -38, 246, 462]; The index of the pilot subcarrier of the 52-tone DRU 13 is [-404, -188, 96, 312]; The index of the pilot subcarrier of the 52-tone DRU 14 is [-380, -164, 120, 336]; The index of the pilot subcarrier of the 52-tone DRU 15 is [-392, -176, 108, 324]; The index of the pilot subcarrier of the 52-tone DRU 16 is [-364, -148, 136, 352].

16. A communication device, characterized in that, Includes a module for performing the method as described in any one of claims 1-15.

17. A communication device, characterized in that, Includes a processor for performing the method as described in any one of claims 1-15.

18. A communication device, characterized in that, Includes logic circuits and interfaces, wherein the logic circuits and interfaces are coupled; The interface is used for inputting and / or outputting information, and the logic circuit is used for performing the method as described in any one of claims 1-15.

19. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program, which, when executed, performs the method as described in any one of claims 1-15.

20. A computer program product, characterized in that, When the computer program product is executed, the method described in any one of claims 1-15 is performed.

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