ELR communication method, apparatus and readable storage medium

Abstract

The present application relates to an ELR communication method, an apparatus and a readable storage medium. The method comprises: generating and sending an ELR PPDU, the ELR PPDU comprising a first field, the first field being generated on the basis of an ELR signature sequence, the ELR signature sequence being carried on 53 subcarriers of subcarrier indexes -26 to 26, and elements of the ELR signature sequence on the subcarriers of subcarrier indexes {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} all being 0. Using the present application can improve the accuracy of packet detection. The present application supports IEEE protocols, such as the 802.11 bn / UHR / Wi-Fi 8 protocol, the integrated millimeter wave / IMMW protocol, the UWB protocol, or the sensing protocol. The present application further supports the spark link / nearlink standard protocol.

Description

ELR communication method, apparatus and readable storage medium

[0001] This application claims priority to Chinese Patent Application No. 202410501127.5, filed on April 24, 2024, entitled "ELR Communication Method, Apparatus and Readable Storage Medium", 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 an enhanced long range (ELR) communication method, apparatus, and readable storage medium. Background Technology

[0003] Wireless local area networks (WLANs) have evolved through several generations, including but not limited to 802.11a / b / g, 802.11n, 802.11ac, 802.11ax, 802.11be, and the currently discussed 802.11bn. Among these, the 802.11n standard is also known as the high throughput (HT) standard, the 802.11ac standard as the very high throughput (VHT) standard, the 802.11ax standard as the high efficient (HE) standard, the 802.11be standard as the extremely high throughput (EHT) standard, and the 802.11bn standard as the ultra-high reliability (UHR) standard.

[0004] In terms of bandwidth, 802.11ax currently supports the following bandwidth configurations: 20MHz, 40MHz, 80MHz, 160MHz, and 80+80MHz. The difference between 160MHz and 80+80MHz is that the former is a continuous frequency band, while the latter's two 80MHz bands can be separated. 802.11be supports bandwidths of 20MHz, 40MHz, 80MHz, 160MHz, and 320MHz.

[0005] Currently, the number of Internet of Things (IoT) devices based on WLAN is increasing, and deploying multiple access points (APs) in home environments is quite difficult, leading to a growing demand for WLAN to support long-distance transmission. The 802.11b standard uses direct-sequence spread spectrum (DSSS) modulation to convert digital signals into wider bandwidth analog signals, enhancing data transmission reliability and thus increasing transmission distance. However, long-distance transmission schemes based on the 802.11b protocol have low spectral efficiency, and the protocol version is relatively old, making network management difficult. Therefore, in the next-generation standard of 802.11b, such as 802.11bn, enhanced long-distance transmission schemes based on orthogonal frequency division multiplexing (OFDM) modulation are a problem currently being researched by those skilled in the art. Summary of the Invention

[0006] This application provides an ELR communication method, apparatus, and readable storage medium, which can improve the accuracy of physical layer protocol data unit (PPDU) detection.

[0007] The present application is described below from different aspects. It should be understood that the different implementation methods and beneficial effects described below can be referenced from each other.

[0008] Firstly, this application provides an ELR communication method applicable to WLANs. The method includes: a first communication device generating and transmitting an enhanced long-range (ELR) physical layer protocol data unit (PPDU), the ELR PPDU including a first field generated based on an ELR signature sequence. The ELR signature sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. All elements of the ELR signature sequence on the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are 0.

[0009] For example, the above ELR identifier sequence is a frequency domain sequence, which can be converted into a time domain signal by inverse Fourier transform. One element of this ELR identifier sequence is carried on a subcarrier.

[0010] For example, the bandwidth of the ELR identifier sequence can be 20MHz.

[0011] For example, the first field described above can be used to implement one or more of the following functions: PPDU detection (or packet detection), automatic gain control (AGC) adjustment, or PPDU synchronization. For instance, the first field can be an ELR identifier sequence field or an enhanced long range short training field (ELR-STF). Alternatively, the first field can include two fields: an ELR identifier sequence field and an ELR-STF. The ELR identifier sequence field can be used to identify that the PPDU carrying the ELR identifier sequence field is an ELR PPDU, enabling packet detection and corresponding format detection of the ELR PPDU; the ELR-STF can be used for AGC adjustment and PPDU synchronization.

[0012] It is understood that the non-zero elements of the traditional legacy short training field (L-STF) sequence are carried on subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}. Therefore, the ELR identifier sequence of this application has all elements of 0 on the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, so that the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the traditional STF sequence is 0 at any time offset. This can effectively reduce the situation of misclassifying other PPDUs as ELR PPDUs and improve the accuracy of PPDU detection (or packet detection).

[0013] In this application, the "time-domain signal corresponding to the ELR signature sequence" can be understood as the time-domain signal obtained after the ELR signature sequence (which is a frequency-domain sequence) undergoes an inverse Fourier transform. Similarly, the "time-domain signal corresponding to the traditional STF sequence" can be understood as the time-domain signal obtained after the traditional STF sequence (which is a frequency-domain sequence) undergoes an inverse Fourier transform. Further details will not be elaborated upon below.

[0014] Secondly, this application provides an ELR communication method that can be applied in a WLAN. The method includes: a second communication device receiving an ELR PPDU, the ELR PPDU including a first field generated based on an ELR signature sequence; and the second communication device then performing PPDU detection based on the first field. The ELR signature sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. All elements of the ELR signature sequence on the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are 0.

[0015] For example, the above ELR identifier sequence is a frequency domain sequence, which can be converted into a time domain signal by inverse Fourier transform. One element of this ELR identifier sequence is carried on a subcarrier.

[0016] For example, the bandwidth of the ELR identifier sequence can be 20MHz.

[0017] For example, the first field described above can be used to implement one or more of the following functions: PPDU detection (or packet detection), AGC adjustment, or PPDU synchronization. For instance, the first field can be an ELR identifier sequence field. Alternatively, the first field can include two fields: an ELR identifier sequence field and an ELR-STF field. The ELR identifier sequence field can be used to identify that the PPDU carrying the ELR identifier sequence field is an ELR PPDU, enabling packet detection and corresponding format detection of the ELR PPDU; the ELR-STF field can be used for AGC adjustment and PPDU synchronization.

[0018] In conjunction with the first or second aspect, in one possible implementation, the above ELR identifier sequence includes three elements: 1, -1, and 0.

[0019] In conjunction with the first or second aspect, in one possible implementation, the elements of the above ELR identifier sequence on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26} are non-zero values ​​(such as 1 or -1), and can be zero values ​​on other subcarriers. For example, in addition to having all elements of 0 on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, the ELR identifier sequence may also have elements of 0 on the subcarrier with subcarrier indices {-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5,-3,-1,0,1,3,5,7,9,11,13,15,17,19,21,23,25}.

[0020] In this embodiment, the non-zero elements of the ELR identifier sequence may be located only on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, so that the time-domain signal corresponding to the ELR identifier sequence has periodicity. For example, the time-domain signal corresponding to the ELR identifier sequence repeats twice within the duration of an OFDM symbol, thereby reducing the processing complexity of the receiver.

[0021] In conjunction with the first or second aspect, in one possible implementation, the subcarrier indices corresponding to the non-zero elements (including 1 or -1) in the aforementioned ELR identifier sequence are symmetric about the subcarrier index {0}. In other words, if the element carried by subcarrier index i is a non-zero value, then the element carried by subcarrier index (-i) is also a non-zero value, and the absolute value of i is less than or equal to 26. For example, the value of i can be (4p+2), i.e., i = 4p+2, where p takes the value of one or more integers from -7 to 7 (i.e., -7, -6, -5, -4, -3, -2, -1, 0, 1, 2, 3, 4, 5, 6, 7).

[0022] In conjunction with the first or second aspect, in one possible implementation, the peak-to-average power ratio (PAPR) of the time-domain signal corresponding to the aforementioned ELR identifier sequence is less than or equal to 3 dB.

[0023] The ELR identifier sequence of this application has a very low PAPR, which can effectively reduce nonlinear error and improve the efficiency of power amplifier.

[0024] In conjunction with the first or second aspect, in one possible implementation, the peak sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal corresponding to the above-mentioned ELR identifier sequence is less than or equal to -9dB.

[0025] It is understandable that the larger the absolute value of the peak-to-sidelobe ratio of the normalized periodic autocorrelation, the easier it is to distinguish the peak and sidelobe of the autocorrelation. Therefore, the ELR identifier sequence designed in this application can improve the performance of PPDU detection (or packet detection) at the ELR receiver and improve the synchronization accuracy of ELRPPDU.

[0026] In conjunction with the first or second aspect, in one possible implementation, the number of non-zero elements in the above ELR identifier sequence can be 10, 12, or 14.

[0027] In conjunction with the first or second aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 10, a possible ELR identifier sequence is:

[0028] {-1 0 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 0 0 0 0 1}; or,

[0029] {-1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 1}.

[0030] In conjunction with the first or second aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 12, a possible ELR identifier sequence is:

[0031] {0 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 0}; or,

[0032] {-1 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 1}.

[0033] In conjunction with the first or second aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 14, a possible ELR identifier sequence is:

[0034] {-1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1}; or,

[0035] {-1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1}.

[0036] It is understandable that the fewer the number of non-zero elements in the ELR identifier sequence (e.g., less than 14), the more consecutive zero values ​​there are in the ELR identifier sequence, and the less accurate the AGC adjustment may be. Conversely, the more non-zero elements in the ELR identifier sequence (e.g., greater than 18), the smaller the power / energy distributed across a single subcarrier. Therefore, in this embodiment, when the number of non-zero elements in the ELR identifier sequence is 14, a better trade-off between the accuracy of AGC adjustment and the power / energy on a single subcarrier can be achieved.

[0037] In conjunction with the first or second aspect, in one possible implementation, the aforementioned ELR identifier sequence can be any sequence from a predefined sequence pair. Therefore, the aforementioned first field can be generated based on any sequence from the predefined sequence pair. The predefined sequence pair includes two sequences.

[0038] For example, the two sequences in this sequence pair can be used to indicate different signaling information. For instance, one sequence in the sequence pair can be used to indicate one type of spatial stream number (e.g., single stream) of ELR data in the ELR PPDU, and the other sequence can be used to indicate another type of spatial stream number (e.g., multiple streams) of ELR data. This saves signaling overhead, eliminating the need for additional signaling to indicate the spatial stream number of ELR data.

[0039] In conjunction with the first or second aspect, in one possible implementation, the normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -6dB.

[0040] This application constrains the time-domain signals corresponding to the two sequences in the sequence pair to have a low cross-correlation amplitude, which is beneficial for distinguishing the signaling information carried by different ELR identifier sequences.

[0041] In conjunction with the first or second aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 12, a possible sequence pair is:

[0042] {-1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1}, and {-1 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 1 0 0 0 -1}.

[0043] In conjunction with the first or second aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 14, a possible sequence pair is:

[0044] {1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1}, and {-1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1}.

[0045] It is understandable that when the number of non-zero elements in each sequence of a sequence pair is 14, a better trade-off can be achieved between the accuracy of AGC adjustment and the power / energy on a single subcarrier.

[0046] It is understood that the relevant content of this application regarding the ELR identifier sequence can also be found in the description of the method embodiments below, which will not be detailed here.

[0047] Thirdly, this application provides a communication device for performing the method described in the first aspect or any possible implementation thereof. The communication device includes modules for performing the method described in the first aspect or any possible implementation thereof.

[0048] Fourthly, this application provides a communication device for performing the method in the second aspect or any possible implementation thereof. The communication device includes modules for performing the method in the second aspect or any possible implementation thereof.

[0049] In the third aspect or the fourth aspect, the aforementioned communication device may include a transceiver module and a processing module. For a detailed description of the transceiver module and the processing module, please refer to the device embodiments shown below. The beneficial effects of the aforementioned third and fourth aspects can be referred to the relevant descriptions of the foregoing first and second aspects, and will not be repeated here.

[0050] Fifthly, this application provides an ELR communication method applicable to WLANs. The method includes: a first communication device generating and transmitting an ELR PDU, the ELR PDU including a first field generated based on an ELR signature sequence. The ELR signature sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. In some scenarios, the elements of the ELR signature sequence on subcarriers with subcarrier indices {-24, 24} are non-zero values, and the elements on some or all of the subcarriers with subcarrier indices {-20, -16, -12, -8, -4, 4, 8, 12, 16, 20} are non-zero values; and the elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26} are non-zero values. In other scenarios, the ELR identifier sequence is a sequence from a predefined sequence pair, in which at least one sequence has non-zero elements on the subcarrier with subcarrier indices {-24, 24}. Each sequence in the pair has non-zero elements on some or all of the subcarriers {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24}, and also has non-zero elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26}.

[0051] For example, the above ELR identifier sequence is a frequency domain sequence, which can be converted into a time domain signal by inverse Fourier transform. One element of this ELR identifier sequence is carried on a subcarrier.

[0052] For example, the bandwidth of the ELR identifier sequence can be 20MHz.

[0053] For example, the first field described above can be used to implement one or more of the following functions: PPDU detection (or packet detection), AGC adjustment, or PPDU synchronization. For instance, the first field can be an ELR identifier sequence field. Alternatively, the first field can include two fields: an ELR identifier sequence field and an ELR-STF field. The ELR identifier sequence field can be used to identify that the PPDU carrying the ELR identifier sequence field is an ELR PPDU, enabling packet detection and corresponding format detection of the ELR PPDU; the ELR-STF field can be used for AGC adjustment and PPDU synchronization.

[0054] For example, the non-zero values ​​mentioned above can include 1 and -1.

[0055] It is understandable that some receivers in the network can use the received signal to perform delay correlation to detect PPDU in order to simplify the complexity. Therefore, in order to reduce the situation where these receivers misidentify ELRPDU as traditional PPDU, the period of the time domain signal amplitude corresponding to the ELR identifier sequence cannot be 0.8us (16 sampling points under 20MHz bandwidth). This is because the period of the time domain signal amplitude corresponding to the traditional STF sequence is 0.8us. Therefore, in this application, the non-zero elements of the ELR identifier sequence are not only located on the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, or only located on the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, but rather the elements on some or all of the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are non-zero values, and the elements on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26} are non-zero values. This can effectively reduce the number of cases where ELRPPDUs are misidentified as traditional PPDUs, thereby improving the accuracy of PPDU detection (or packet detection).

[0056] Sixthly, this application provides an ELR communication method that can be applied in a WLAN. The method includes: a second communication device receiving an ELR PPDU, the ELR PPDU including a first field generated based on an ELR signature sequence; and the second communication device then performing PPDU detection based on the first field. The ELR signature sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. In some scenarios, the ELR identifier sequence has non-zero elements on the subcarrier with subcarrier indices {-24, 24} and non-zero elements on some or all of the subcarriers with subcarrier indices {-20, -16, -12, -8, -4, 4, 8, 12, 16, 20}, and non-zero elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26}. In other scenarios, the ELR identifier sequence is a sequence from a predefined sequence pair, where at least one sequence in the pair has non-zero elements on the subcarrier with subcarrier indices {-24, 24}. Each sequence in the sequence pair has non-zero values ​​on some or all of the subcarriers of the subcarrier {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, and has non-zero values ​​on some or all of the subcarriers of the subcarrier index {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}.

[0057] For example, the above ELR identifier sequence is a frequency domain sequence, which can be converted into a time domain signal by inverse Fourier transform. One element of this ELR identifier sequence is carried on a subcarrier.

[0058] For example, the bandwidth of the ELR identifier sequence can be 20MHz.

[0059] For example, the first field described above can be used to implement one or more of the following functions: PPDU detection (or packet detection), AGC adjustment, or PPDU synchronization. For instance, the first field can be an ELR identifier sequence field. Alternatively, the first field can include two fields: an ELR identifier sequence field and an ELR-STF field. The ELR identifier sequence field can be used to identify that the PPDU carrying the ELR identifier sequence field is an ELR PPDU, enabling packet detection and corresponding format detection of the ELR PPDU; the ELR-STF field can be used for AGC adjustment and PPDU synchronization.

[0060] For example, the non-zero values ​​mentioned above can include 1 and -1.

[0061] In conjunction with the fifth or sixth aspect, in one possible implementation, the above ELR identifier sequence includes three elements: 1, -1, and 0.

[0062] In conjunction with the fifth or sixth aspect, in one possible implementation, the elements of the above ELR identifier sequence on the subcarrier with subcarrier indices {-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5,-3,-1,0,1,3,5,7,9,11,13,15,17,19,21,23,25} are all 0.

[0063] In conjunction with the fifth or sixth aspect, in one possible implementation, the subcarrier indices corresponding to the non-zero elements (including 1 or -1) in the aforementioned ELR identifier sequence can be symmetric about the subcarrier index {0}. In other words, if the element carried by subcarrier index i is a non-zero value, then the element carried by subcarrier index -i is also a non-zero value, and the absolute value of i is less than or equal to 26. For example, the value of i can be (2p), i.e., i = 2p, where the value of p is one or more integers from -13 to 13 (i.e., -13, -12, -11, ..., -3, -2, -1, 0, 1, 2, 3, ..., 11, 12, 13).

[0064] In conjunction with the fifth or sixth aspect, in one possible implementation, the PAPR of the time-domain signal corresponding to the above ELR identifier sequence after being upsampled by 8 times is less than or equal to 3.01dB.

[0065] The ELR identifier sequence of this application has a very low PAPR, which can effectively reduce nonlinear error and improve the efficiency of power amplifier.

[0066] In conjunction with the fifth or sixth aspect, in one possible implementation, the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the L-STF sequence is 0 at a time offset of 0; and / or, the peak value of the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the L-STF sequence is less than or equal to -6dB.

[0067] In this application, the ELR identifier sequence is orthogonal to the traditional STF sequence, and the normalized periodic cross-correlation amplitude between its time domain signal and the time domain signal corresponding to the traditional STF (L-STF) sequence is less than -6dB, which can further reduce the problem of PPDU false detection.

[0068] In conjunction with the fifth or sixth aspect, in one possible implementation, the normalized periodic autocorrelation amplitude of the time-domain signal corresponding to the aforementioned ELR identifier sequence after a delay of 0.8 μs is less than or equal to -10 dB; and / or, the peak-to-sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal corresponding to the aforementioned ELR identifier sequence after a delay of 0.8 μs is less than or equal to -8 dB.

[0069] It is understandable that the larger the absolute value of the peak-to-sidelobe ratio of the normalized periodic autocorrelation, the easier it is to distinguish the peak and sidelobe of the autocorrelation. Therefore, the ELR identifier sequence designed in this application can improve the performance of PPDU detection (or packet detection) at the ELR receiver and improve the synchronization accuracy of ELRPPDU. In addition, the normalized periodic autocorrelation amplitude of the time-domain signal corresponding to the ELR identifier sequence in this application is very small after a delay of 0.8µs, which can reduce the situation where traditional equipment mistakenly identifies the ELR PPDU as a traditional PPDU.

[0070] In conjunction with the fifth or sixth aspect, in one possible implementation, the number of non-zero elements in the above ELR identifier sequence can be 12, 14, 16, 18, 20, 22, 24, or 26.

[0071] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 12, a possible ELR identifier sequence is:

[0072] {0 0 -1 0 0 0 1 0 -1 0 0 0 0 0 -1 0 0 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0}.

[0073] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 14, a possible ELR identifier sequence is:

[0074] {-1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 -1 0 1 0 0 0 0 0 1 0 -1 0 1}.

[0075] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 16, a possible ELR identifier sequence is:

[0076] {0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0 0}; or,

[0077] {0 0 -1 0 0 0 -1 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 1 0 0 0 0 0 1 0 -1 0 0 0 -1 0 0}.

[0078] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 18, a possible ELR identifier sequence is:

[0079] {0 0 -1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 0}; or,

[0080] {0 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0}.

[0081] It is understandable that the fewer the number of non-zero elements in the ELR identifier sequence (e.g., less than 14), the more consecutive zero values ​​there are in the ELR identifier sequence, and the less accurate the AGC adjustment may be. Conversely, the more non-zero elements in the ELR identifier sequence (e.g., greater than 18), the smaller the power / energy distributed across a single subcarrier. Therefore, in the embodiments of this application, when the number of non-zero elements in the ELR identifier sequence is 14, 16, or 18, a better trade-off can be achieved between the accuracy of AGC adjustment and the power / energy on a single subcarrier.

[0082] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 20, a possible ELR identifier sequence is:

[0083] {-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}; or,

[0084] {-1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 0 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 1}; or,

[0085] {-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}.

[0086] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 22, a possible ELR identifier sequence is:

[0087] {-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}; or,

[0088] {-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}; or,

[0089] {-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}.

[0090] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 24, a possible ELR identifier sequence is:

[0091] {-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 1 0 -1 0 -1 0 1 0 -1 0 -1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}; or,

[0092] {-1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 1 0 1 0 -1 0 -1}; or,

[0093] {-1 0 -1 0 1 0 1 0 1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 1 0 -1 0 1 0 -1}.

[0094] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in the above ELR identifier sequence is 26, a possible ELR identifier sequence is:

[0095] {-1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 -1}; or,

[0096] {-1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 1 0 -1 0 -1 0 1 0 1}.

[0097] In conjunction with the fifth or sixth aspect, in one possible implementation, the two sequences in the predefined sequence pair described above can be used to indicate different signaling information. For example, one sequence in the sequence pair can be used to indicate one type of spatial stream number (e.g., single stream) of ELR data in the ELR PPDU, while the other sequence can be used to indicate another type of spatial stream number (e.g., multiple streams) of ELR data. This saves signaling overhead, eliminating the need for additional signaling to indicate the spatial stream number of ELR data.

[0098] In conjunction with the fifth or sixth aspect, in one possible implementation, the normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to the two sequences in the predefined sequence pair is less than or equal to -9dB.

[0099] This application constrains the time-domain signals corresponding to the two sequences in the sequence pair to have a low cross-correlation amplitude, which is beneficial for distinguishing the signaling information carried by different ELR identifier sequences.

[0100] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 14, a possible sequence pair is:

[0101] {-1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 -1 0 1 0 0 0 0 0 1 0 -1 0 1} and {0 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 0 0 1 0 -1 0 -1 0 1 0 0 0 0 0 1 0 0}.

[0102] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 16, a possible sequence pair is:

[0103] {1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 0 1 0 0 0 1 0 1 0 -1 0 -1 0 -1} and {0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0 0 1 0 0 0}; or,

[0104] {0 0 -1 0 0 0 1 0 -1 0 0 0 0 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0 0} and {1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 -1 0 -1}.

[0105] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 18, a possible sequence pair is:

[0106] {-1 0 0 0 0 0 -1 0 1 0 0 0 1 0 -1 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 -1 0 0 0 1 0 1 0 0 0 0 0 -1} and {0 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0}; or,

[0107] {0 0 -1 0 1 0 1 0 1 0 -1 0 0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0 0 1 0 1 0 -1 0 1 0 1 0 0} and {0 0 -1 0 -1 0 -1 0 0 0 -1 0 0 0 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 1 0 -1 0 0 0 0 0 -1 0 0 0 1 0 -1 0 1 0 0 0 0 1 0 -1 0 1 0 0}; or,

[0108] {0 0 -1 0 0 0 1 0 1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 -1 0 0 0 1 0 0 0} and {1 0 -1 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 0 0 0 0 0 -1 0 0 0 1 0 -1 0 1 0 1 0 1 0 0 0 0 0 -1 0 -1 0 -1}.

[0109] It is understandable that when the number of non-zero elements in each sequence of a sequence pair is 14, 16, or 18, a better trade-off can be achieved between the accuracy of AGC adjustment and the power / energy on a single subcarrier.

[0110] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 20, a possible sequence pair is:

[0111] {1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 -1} and {-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}; or,

[0112] {-1 0 0 0 -1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 1} and {-1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 -1 0 1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1}; or,

[0113] {0 0 -1 0 1 0 1 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 1 0 -1 0 0} and {1 0 -1 0 0 0 -1 0 1 0 1 0 0 0 -1 0 1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 -1}; or,

[0114] {-1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 1 0 1 0 0 0 -1} and {-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}.

[0115] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 22, a possible sequence pair is:

[0116] {-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 -1 0 1} and {-1 0 -1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 1}.

[0117] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 24, a possible sequence pair is:

[0118] {-1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 0 0 -1 0 1 0 -1 0 1 0 1 0 -1} and {1 0 -1 0 -1 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 -1}; or,

[0119] {-1 0 -1 0 1 0 1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 -1} and {-1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 1 0 1 0 -1}.

[0120] In conjunction with the fifth or sixth aspect, in one possible implementation, when the number of non-zero elements in each sequence of the sequence pair is 26, a possible sequence pair is:

[0121] {-1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0 1} and {1 0 -1 0 1 0 -1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 -1 0 -1}.

[0122] In a seventh aspect, this application provides a communication device for performing the method in the fifth aspect or any possible implementation thereof. The communication device includes modules for performing the method in the fifth aspect or any possible implementation thereof.

[0123] Eighthly, this application provides a communication device for performing the method in the sixth aspect or any possible implementation thereof. The communication device includes modules for performing the method in the sixth aspect or any possible implementation thereof.

[0124] In the seventh or eighth aspect, the aforementioned communication apparatus may include a transceiver module and a processing module. Further details regarding the transceiver module and processing module can be found in the apparatus embodiments shown below. The beneficial effects of the seventh and eighth aspects described above can be referenced in the relevant descriptions of the fifth and sixth aspects, and will not be repeated here.

[0125] Ninthly, this application provides a communication device including a processor for executing the method shown in any possible implementation of the first aspect, the second aspect, the fifth aspect, the sixth aspect, or any of these aspects. Alternatively, the processor is configured to execute a program stored in a memory, wherein when the program is executed, the method shown in any possible implementation of the first aspect, the second aspect, the fifth aspect, the sixth aspect, or any of these aspects is executed.

[0126] In conjunction with the ninth aspect, in one possible implementation, the memory is located outside the aforementioned communication device.

[0127] In conjunction with the ninth aspect, in one possible implementation, the memory is located within the aforementioned communication device.

[0128] In this application, 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.

[0129] In conjunction with the ninth aspect, in one possible implementation, the communication device further includes a transceiver for transmitting or receiving ELR PPDUs.

[0130] Tenthly, this application provides a communication device that may include logic circuitry and an interface coupled together. The interface is used for interacting with (or transmitting / receiving or inputting / outputting) an ELR PPDU, and the logic circuitry is used to execute program instructions causing the communication device to perform the methods described in any possible implementation of the first aspect, the second aspect, the fifth aspect, the sixth aspect, or any of these aspects. The interface may be a communication interface or a transceiver. The transceiver may be a radio frequency module in the communication device, or a combination of a radio frequency module and an antenna, or an input / output interface of a chip or circuit.

[0131] Eleventhly, this application provides a readable storage medium storing program instructions that, when executed by one or more processors, cause a device including the one or more processors to perform the method described in any possible implementation of the first aspect, or the second aspect, or the fifth aspect, or the sixth aspect, or any of the aspects.

[0132] In a twelfth aspect, this application provides a computer program product containing program instructions that, when run, causes the method described in any possible implementation of the first aspect, or the second aspect, or the fifth aspect, or the sixth aspect, or any of these aspects to be executed.

[0133] In a thirteenth aspect, this application provides a wireless communication system, which includes a first communication device and a second communication device; the first communication device is used to perform the method described in any possible implementation of the first aspect, or the fifth aspect, or any of the above aspects, and the second communication device is used to perform the method described in any possible implementation of the second aspect, or the sixth aspect, or any of the above aspects.

[0134] The technical effects achieved in the above aspects can be referred to each other or to the beneficial effects in the method embodiments shown below, which will not be repeated here. Attached Figure Description

[0135] Figure 1 is a network architecture diagram of a wireless communication system provided in an embodiment of this application;

[0136] Figure 2a is a schematic diagram of the access point provided in an embodiment of this application;

[0137] Figure 2b is a schematic diagram of the site structure provided in an embodiment of this application;

[0138] Figure 3 is a schematic diagram of a possible structure of the ELR PPDU provided in an embodiment of this application;

[0139] Figure 4 is a schematic diagram of a possible structure of the ELR preamble field provided in an embodiment of this application;

[0140] Figure 5 is a schematic diagram of normalized periodic cross-correlation between the time-domain signal corresponding to the existing ELR-Signature Sequence and the time-domain signal corresponding to the traditional STF sequence provided in the embodiments of this application;

[0141] Figure 6 is a schematic diagram of the normalized periodic autocorrelation of the time-domain signal corresponding to the existing ELR-Signature Sequence provided in the embodiments of this application;

[0142] Figure 7 is a flowchart illustrating an ELR communication method provided in an embodiment of this application.

[0143] Figure 8 is a schematic diagram of the generation and sending process of the first field provided in an embodiment of this application;

[0144] Figure 9 is a schematic diagram of the normalized periodic cross-correlation between the time-domain signals corresponding to the ELR identifier sequence and the traditional STF sequence provided in the embodiments of this application;

[0145] Figure 10a is a schematic diagram of normalized periodic cross-correlation between time-domain signals corresponding to a sequence pair provided in an embodiment of this application;

[0146] Figure 10b is a schematic diagram of normalized periodic cross-correlation between time-domain signals corresponding to another sequence pair provided in an embodiment of this application;

[0147] Figure 11 is another flowchart illustrating the ELR communication method provided in an embodiment of this application;

[0148] Figure 12 is a structural schematic diagram of a communication device provided in an embodiment of this application;

[0149] Figure 13 is another structural schematic diagram of the communication device provided in an embodiment of this application;

[0150] Figure 14 is another structural schematic diagram of the communication device provided in the embodiments of this application. Detailed Implementation

[0151] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0152] In the description of this application, terms such as "first" and "second" are used only to distinguish different objects, not to describe a specific order. Furthermore, unless otherwise stated, " / " means "or," for example, A / B can mean A or B. "And / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, and B alone. Additionally, "at least one" refers to one or more, and "multiple" refers to two or more. "One or more of the following" or similar expressions refer to any combination of these items, including any combination of single or multiple items. For example, at least one of a, b, or c can represent: a, b, c; a and b; a and c; b and c; or a and b and c. Where a, b, and c can be single or multiple.

[0153] 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 steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0154] In this application, the words "exemplary" or "for example" are used to indicate that something is an example, illustration, or illustration. Any embodiment or design described as "exemplary," "for example," or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or designs. Rather, the use of the words "exemplary," "for example," or "for example" is intended to present the relevant concepts in a specific manner.

[0155] It is understood that in this application, "when," "if," and "if" all refer to the device performing a corresponding action under certain objective circumstances, and are not time-limited, nor do they require the device to perform a judgment action when it is implemented, nor do they imply any other limitations. The device performing a corresponding action under certain objective circumstances includes: satisfying the objective circumstances, i.e., being able to perform the corresponding action; or satisfying both the objective circumstances and other circumstances, in order to perform the corresponding action.

[0156] In this application, the use of singular designations for elements is intended to represent "one or more" rather than "one and only one," unless otherwise specified.

[0157] It is understood that in the embodiments of this application, "B corresponding to A", "A and B correspond" or similar expressions indicate that B is associated with A, and B can be determined based on A. Determining B based on A does not mean that B is determined solely based on A; B can also be determined based on A and / or other information.

[0158] The technical solutions provided in this application can be applied to wireless local area network (WLAN) scenarios. For example, they support IEEE 802.11 related standards, such as 802.11a / b / g, 802.11n, 802.11ac, 802.11ax, and IEEE 802.11ax next-generation Wi-Fi protocols, such as 802.11be, Wi-Fi 7, Extremely High Throughput (EHT), 802.11ad, or 802.11ay, as well as 802.11be next-generation and Wi-Fi 8. They can also be applied to wireless personal area networks (WLANs) based on ultra-wideband (UWB). Network (WPAN) systems, such as the 802.15 series standards, can also be applied to sensing systems, such as the 802.11bf series standards, as well as the 802.11bn standard or ultra-high reliability (UHR) standard; they can also be applied to millimeter wave (MMW) or integrated millimeter wave (IMMW) protocols, etc. Among them, the 802.11n standard is called high throughput (HT), the 802.11ac standard is called very high throughput (VHT), the 802.11ax standard is called high efficient (HE), and the 802.11be standard is called extremely high throughput (EHT). 802.11bf includes two main categories of standards: low frequency (e.g., sub7GHz) and high frequency (e.g., 60GHz). The implementation of sub-7GHz mainly relies on standards such as 802.11ac, 802.11ax, 802.11be, and next-generation standards, while the implementation of 60GHz mainly relies on standards such as 802.11ad, 802.11ay, and next-generation standards. Among them, 802.11ad can also be called the directional multi-gigabit (DMG) standard, and 802.11ay can also be called the enhanced directional multi-gigabit (EDMG) standard.

[0159] The technical solutions of this application embodiment can be applied to communication scenarios between an access point and one or more sites, as well as communication scenarios between access points and between sites. In this application embodiment, the term "communication" can also be described as "data transmission," "information transmission," or "transmission." In this application embodiment, the term "transmission" can also be described as "sending" and / or "receiving."

[0160] Referring to Figure 1, Figure 1 is a network architecture diagram of a wireless communication system provided in an embodiment of this application. As shown in Figure 1, the wireless communication system may include one or more access point (AP) type stations (STAs) and one or more non-access point type stations (non-AP STAs). For ease of description, access point type stations (AP STAs) are simply referred to as access points (APs), and non-access point type stations (non-AP STAs) are simply referred to as stations (STAs). APs and STAs support WLAN communication protocols, which may include 802.11bn (or UHR), and may also include protocols such as 802.11be, 802.11ax, and 802.11ac. Of course, with the continuous evolution and development of communication technologies, the communication protocol may also include next-generation protocols of 802.11bn, etc. Taking WLAN as an example, the apparatus for implementing the method of this application may be an AP and / or STA in a WLAN, or a chip or processing system installed in an AP and / or STA.

[0161] It is understood that Figure 1 illustrates a wireless communication system comprising one access point (AP) and six stations (STA 1, STA 2, STA 3, STA 4, STA 5, and STA 6). In practical applications, the number of APs and STAs included in this wireless communication system may be more or less, and this application does not limit the number of APs and STAs in the wireless communication system.

[0162] In one possible implementation, the access point (AP as shown in Figure 1) can be a device with wireless communication capabilities, supporting communication using the WLAN protocol and having the ability to communicate with other devices (such as stations or other access points) in the WLAN network. This wireless communication device can be a complete device, or it can be a chip or processing system installed within a complete device. Devices with these chips or processing systems can implement the methods and functions of the embodiments of this application under the control of the chip or processing system. Access points can be deployed in homes, buildings, and parks, with a coverage radius of tens to hundreds of meters; they can also be deployed outdoors. An access point can be understood as a bridge connecting wired and wireless networks, its main function being to connect various wireless network clients together and then connect the wireless network to the Ethernet. For example, an access point can be a terminal device (such as a mobile phone) or a network device (such as a communication server, router, switch, bridge, etc.) with a wireless-fidelity (Wi-Fi) chip.

[0163] The access point in this application can be a device that supports the 802.11bn standard. Of course, the access point can also support various WLAN standards of the 802.11 family, such as 802.11be, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11ad, 802.11ay, and 802.11a. In one possible implementation, the access point can also support the IEEE Integrated mmWave / IMMW protocol, or the IEEE 802.11bf / sensing protocol, or the Spark Link / NearLink standard protocol.

[0164] In one possible implementation, a station (as shown in any of the stations in Figure 1) can be a device with wireless communication capabilities, supporting communication using the WLAN protocol and having the ability to communicate with other stations or access points in the WLAN network. This wireless communication device can be a complete device, or a chip or processing system installed within a complete device. Devices with these chips or processing systems can implement the methods and functions of the embodiments of this application under the control of the chip or processing system. A station can also be a wireless communication chip, a wireless sensor, or a wireless communication terminal, and can also be referred to as a user. For example, a station 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, or a computer supporting Wi-Fi communication, etc.

[0165] The site in this application can also be a device that supports the 802.11bn standard. Of course, the site can also support various WLAN standards of the 802.11 family, such as 802.11be, 802.11bf, 802.11ax, 802.11ac, 802.11n, 802.11g, 802.11b, 802.11ad, 802.11ay, and 802.11a. In one possible implementation, the site can also support the IEEE Integrated mmWave / IMMW protocol, or the IEEE 802.11bf / sensing protocol, or the Spark Link / NearLink standard protocol.

[0166] 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 supporting WLAN communication (such as access points or sites) can be sensor nodes in smart cities (e.g., smart water meters, smart electricity meters, smart air quality monitoring nodes), smart devices in smart homes (e.g., smart cameras, projectors, displays, televisions, speakers, refrigerators, washing machines, etc.), nodes in the Internet of Things (IoT), entertainment terminals (e.g., augmented reality (AR), virtual reality (VR), and other wearable devices), smart devices in smart offices (e.g., printers, projectors, loudspeakers, speakers, etc.), vehicle-to-everything (V2X) devices, infrastructure in daily life scenarios (e.g., vending machines, supermarket self-service navigation kiosks, self-checkout machines, self-ordering machines, etc.), and equipment in large sports and music venues, etc. The specific forms of sites and access points in this application embodiment are not limited; they are merely illustrative examples.

[0167] It should be understood that the 802.11 standard focuses on the physical layer (PHY) and medium access control (MAC) layers. In one example, see Figure 2a, which is a schematic diagram of the access point structure provided in an embodiment of this application. The AP can be multi-antenna / multi-RF or single-antenna / single-RF, where the antenna / RF is used to transmit / receive physical layer protocol data units (PPDUs). In one implementation, the antenna or RF portion of the AP can be separated from the main body of the AP, presenting a remote layout. In Figure 2a, the AP may include physical layer processing circuitry and medium access control processing circuitry. The physical layer processing circuitry can be used to process physical layer signals, and the MAC layer processing circuitry can be used to process MAC layer signals. In another example, see Figure 2b, which is a schematic diagram of the station structure provided in an embodiment of this application. Figure 2b shows a schematic diagram of a single-antenna / single-RF STA structure. In practical scenarios, the STA can also be multi-antenna / multi-RF, and can be a device with two or more antennas, where the antenna / RF is used to transmit / receive data packets. In one implementation, the antenna or radio frequency section of the STA can be separated from the main body of the STA, presenting a remote layout. In Figure 2b, the STA may include a PHY processing circuit and a MAC processing circuit. The physical layer processing circuit can be used to process physical layer signals, and the MAC layer processing circuit can be used to process MAC layer signals.

[0168] In some embodiments, the AP in the wireless communication system shown in Figure 1 can be replaced by an Access Point Multi-Link Device (AP MLD), and the STA can be replaced by a Non-Access Point Multi-Link Device (non-AP MLD). That is, the technical solutions provided in this application can also be applied to scenarios where multi-link devices (MLDs) communicate with each other. A multi-link device is a wireless communication device that supports parallel transmission across multiple links. Compared to devices that only support single-link transmission, multi-link devices have higher transmission efficiency and higher throughput. A multi-link device includes one or more affiliated STAs. An affiliated STA is a logical site that can operate on a single link. The affiliated site can be an access point (AP) or a non-access point STA. A multi-link device whose affiliated site is an AP can be called an AP MLD, and a multi-link device whose affiliated site is a non-AP STA can be called a non-AP MLD.

[0169] In one possible implementation, the multi-link device (which can be either a non-AP MLD or an AP MLD) involved in the embodiments of this application is a device with wireless communication function. This device can be a complete device or a chip or processing system installed in the complete device. The device with these chips or processing systems installed can implement the methods and functions of the embodiments of this application under the control of these chips or processing systems.

[0170] While this application primarily uses an example of a network deploying the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standard, those skilled in the art will readily understand that the various aspects of this application can be extended to other networks employing various standards or protocols. Examples include personal area networks (PANs), Bluetooth, high-performance radio LANs (HIPERLANs) (a wireless standard similar to IEEE 802.11, primarily used in Europe), wide area networks (WANs), or other networks now known or to be developed in the future. Therefore, regardless of the coverage area and wireless access protocol used, the various aspects provided in this application can be applied to any suitable wireless network.

[0171] The following is a brief explanation of some of the terms or nouns used in this application.

[0172] I. Peak to average power ratio (PAPR)

[0173] Peak-to-average power ratio (PAPR) is a measure of the power of a wireless signal over a given period of time. Since the amplitude of a wireless signal varies continuously when observed in the time domain, its transmission power is not constant.

[0174] It is understandable that an OFDM symbol is composed of multiple independently modulated subcarrier signals superimposed. When the phases of the subcarriers are the same or close, the superimposed signal will be modulated by the same initial phase signal, resulting in a large instantaneous power peak and thus a high peak-to-average power ratio (PAPR). Generally speaking, the dynamic range of a power amplifier (PA) is limited, so multiple-input multiple-output (MIMO) OFDM signals with a large PAPR are very likely to enter the nonlinear region of the power amplifier, causing nonlinear distortion, resulting in significant spectral spread interference and in-band signal distortion, leading to a severe degradation in the overall system performance.

[0175] The dynamic range of a power amplifier (PA) is the logarithm of the ratio of the amplifier’s maximum undistorted output power to the system’s noise output power at rest, expressed in decibels (dB).

[0176] II. Normalized Periodic Cross-Correlation and Normalized Periodic Autocorrelation

[0177] The normalized periodic cross-correlation function is defined as shown in the following formula (1-1):

[0178] in, This represents the normalized periodic cross-correlation function. This represents the periodic cross-correlation function between sequence x and sequence y. This represents the value of the periodic autocorrelation function of sequence x at time offset 0. This represents the value of the periodic autocorrelation function of the sequence y at a time offset of 0.

[0179] The normalized periodic autocorrelation function is defined as shown in the following formula (1-2):

[0180] in, The normalized periodic autocorrelation function of sequence x is represented by... The periodic autocorrelation function of sequence x. This represents the value of the periodic autocorrelation function of sequence x at a time offset of 0.

[0181] III. ELRPPDU

[0182] Figure 3 shows a possible structure of the Enhanced Long Range Physical Layer Protocol Data Unit (ELR PPDU), which is a schematic diagram of a possible ELR PPDU structure provided in an embodiment of this application. As shown in Figure 3, the ELR PPDU includes, but is not limited to, one or more of the following: a Legacy preamble field, an Enhanced Long Range Preamble (ELR preamble) field, and an Enhanced Long Range Data (ELR data) field. The Legacy preamble field can be used by legacy devices to circumvent the transmission of this PPDU. The ELR preamble field can be used for ELR PPDU detection, channel estimation, and to indicate the modulation and coding information of the ELR data. The ELR data field can carry the transmitted data. It is understood that the names of the various contents in the ELR PPDU shown in Figure 3 are merely examples, and other names may exist in actual applications; this application does not limit this.

[0183] In one possible implementation, the Legacy preamble field may include, but is not limited to, the following: a legacy short training field (L-STF), a legacy long training field (L-LTF), and a legacy signaling (L-SIG) field. For example, the Legacy preamble field may also include one or more of the following: binary phase shift keying (BPSK) symbol 1, BPSK symbol 2, a repeated legacy signaling (RL-SIG) field, and a universal signaling (U-SIG) field. It is understood that as the standard develops and evolves, the Legacy preamble field may include more or fewer fields, and this application does not impose any limitations on this.

[0184] In one possible implementation, refer to Figure 4, which is a schematic diagram of a possible structure of the ELR preamble field provided in an embodiment of this application. The transmission bandwidth of the ELR preamble field can be 20MHz. Of course, as the standard develops and evolves, the transmission bandwidth of the ELR preamble field can be larger or smaller than 20MHz, and this application does not impose any limitations on this. As shown in Figure 4, the ELR preamble field may include, but is not limited to: an ELR Signature Sequence field, an enhanced long-range long training field (ELR-LTF), and an enhanced long-range legacy signaling field (ELR-SIG). For example, the ELR preamble field may also include an enhanced long-range short training field (ELR-STF).

[0185] The ELR identifier sequence field is used to identify that the PPDU is an ELR PPDU, enabling packet detection and corresponding format detection for ELR PPDUs. The ELR-STF field is used for automatic gain control (AGC) adjustment and PPDU synchronization, and can contain multiple ELR-STF symbols. The ELR-LTF field is used for channel estimation and can contain multiple ELR-LTF symbols. The ELR-SIG field indicates modulation and coding information for the data portion (such as ELR data) and can contain multiple OFDM symbols.

[0186] For example, the ELR identifier sequence field can also be used to implement the functionality of ELR-STF, thus eliminating the need for ELR-STF in the ELR preamble field and saving signaling overhead. In other words, besides identifying that the PPDU is an ELR PPDU and implementing packet detection and corresponding format detection for ELR PPDUs, the ELR identifier sequence field can also be used for AGC adjustment and PPDU synchronization.

[0187] It is understood that, as the standard develops and evolves, the ELR preamble field may contain more or fewer fields than shown in Figure 4, and this application does not impose any restrictions. Furthermore, the names of the fields shown in Figure 4 are merely examples; other names may exist in practical applications, and this application does not impose any restrictions.

[0188] IV. ELR Signature Sequence

[0189] In one possible implementation, the aforementioned ELR signature sequence field can be generated based on the ELR signature sequence. Alternatively, both the aforementioned ELR signature sequence field and the aforementioned ELR-STF can be generated based on the ELR signature sequence. For example, the ELR signature sequence can be a frequency-domain BPSK sequence, with a structure similar to a traditional STF sequence. Currently, the ELR signature sequence is shown below:

[0190] LRSTF -26,26 ={-1 0 0 0 -1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1 0 0 0 1}…………………………………………………………………………………………(1-3)

[0191] Among them, "LRSTF" -26,26 "This can represent an ELR-Signature Sequence carried on subcarriers with indices from -26 to 26 in the frequency domain. In other words, an ELR-Signature Sequence can be carried on 53 subcarriers with indices from -26 to 26 in the frequency domain, and one subcarrier can carry one element of the ELR-Signature Sequence. It can be understood that the ELR-Signature Sequence is a frequency domain sequence, which can be converted into a time domain signal through an inverse Fourier transform."

[0192] In one possible implementation, the traditional STF sequence is as follows:

[0193] Among them, “S” -26,26 This indicates a traditional STF sequence carried on subcarriers with indices from -26 to 26 in the frequency domain. It can be understood that a traditional STF sequence can also be carried on 53 subcarriers with indices from -26 to 26 in the frequency domain, with each subcarrier carrying one element of the traditional STF sequence. Furthermore, a traditional STF sequence is also a frequency domain sequence, which can be converted into a time domain signal using an inverse Fourier transform.

[0194] Therefore, it can be concluded that the ELR-Signature Sequence (1-3) and the traditional STF sequence (1-4) are orthogonal. Sequence orthogonality can be understood as the product of the inner indices of the elements of the two sequences being equal to zero.

[0195] It is understandable that traditional receivers (or traditional devices) can use the cross-correlation result between the local signal (such as the time-domain signal corresponding to the traditional STF sequence (1-4)) and the received signal to determine the presence of a traditional PPDU when performing PPDU detection. However, if the transmitter sends an ELR PPDU, the cross-correlation result between the time-domain signal corresponding to the ELR-Signature Sequence (1-3) and the time-domain signal corresponding to the traditional STF sequence (1-4) will affect the PPDU detection result of the traditional receiver.

[0196] When the ELR-Signature Sequence (1-3) and the traditional STF sequence (1-4) are orthogonal, the normalized periodic cross-correlation value between the time-domain signal corresponding to the ELR-Signature Sequence (1-3) and the time-domain signal corresponding to the traditional STF sequence (1-4) is 0 when the time shift is 0. Refer to Figure 5, which is a schematic diagram of the normalized periodic cross-correlation between the time-domain signal corresponding to the existing ELR-Signature Sequence and the time-domain signal corresponding to the traditional STF sequence provided in this application embodiment. In Figure 5, the horizontal axis represents the time shift in bits; the vertical axis represents the magnitude of the normalized periodic cross-correlation. As shown in Figure 5, the normalized periodic cross-correlation value between the time-domain signal corresponding to the ELR-Signature Sequence (1-3) and the time-domain signal corresponding to the traditional STF sequence (1-4) is 0 when the time shift is 0. As shown in Figure 5, the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR-Signature Sequence (1-3) and the time-domain signal corresponding to the traditional STF sequence (1-4) shows multiple high-amplitude peaks. The normalized periodic autocorrelation of the time-domain signal corresponding to the traditional STF sequence (1-4) also shows multiple peaks. Therefore, when performing PPDU detection, the traditional receiver (or traditional equipment) may misidentify the ELR PPDU as a traditional PPDU.

[0197] In this application, "traditional receiver" or "traditional device" can be understood as a receiver or device that supports protocols prior to 802.11bn but does not support 802.11bn. For example, a traditional receiver or device can be a receiver or device that supports 802.11a / b / g, 802.11n, 802.11ac, 802.11ax, 802.11be, 802.11ad, 802.11ay, or 802.11bf. Correspondingly, "traditional PPDU" can be understood as a PPDU prior to the 802.11bn protocol, such as VHT PPDU, HE PPDU, or EHT PPDU, etc.

[0198] When performing PPDU detection (or packet detection), the ELR receiver can use the cross-correlation result between the local signal (such as the time-domain signal corresponding to the ELR-Signature Sequence) and the received signal to determine whether an ELR PPDU exists. Therefore, if the transmitter sends an ELR PPDU, the autocorrelation result of the time-domain signal corresponding to the ELR-Signature Sequence will affect the PPDU detection result of the ELR receiver.

[0199] Referring to Figure 6, Figure 6 is a schematic diagram of the normalized periodic autocorrelation of the time-domain signal corresponding to the existing ELR-Signature Sequence provided in the embodiments of this application. In Figure 6, the horizontal axis represents the time-domain sample number (in bits), and the vertical axis represents the amplitude of the normalized periodic autocorrelation (in dB). As shown in Figure 6, the normalized periodic autocorrelation of the time-domain signal corresponding to ELR-Signature Sequence (1-3) has high sidelobes. When the ELR receiver performs PPDU detection (or packet detection), if the cross-correlation result between the local signal (such as the time-domain signal corresponding to the ELR-Signature Sequence) and the received signal has only one peak, it indicates the presence of an ELR PPDU. Therefore, when the normalized periodic autocorrelation of the time-domain signal corresponding to ELR-Signature Sequence (1-3) has high sidelobes, the ELR receiver may misjudge the presence of multiple peaks, thus misjudging the absence of an ELR PPDU, severely affecting the performance of PPDU detection (or packet detection).

[0200] Furthermore, the peak-to-average power ratio (PAPR) of the time-domain signal corresponding to the above ELR-Signature Sequence (1-3) is 3.86dB. Its high PAPR may cause nonlinear distortion of the signal and will have an adverse effect on the automatic gain control (AGC) settings of the receiver and the performance of the transmitter.

[0201] In view of this, this application provides an ELR communication method, apparatus, and readable storage medium. By designing the ELR identifier sequence to have zero or low periodic cross-correlation with the traditional STF sequence in the time domain, the error rate of misclassifying other PPDUs as ELR PPDUs can be effectively reduced, thus improving the accuracy of PPDU detection (or packet detection). Furthermore, the time-domain signal corresponding to the ELR identifier sequence designed in this application has good autocorrelation performance, which can reduce the error rate of misclassifying ELR PPDUs as not being ELR PPDUs, thereby improving the performance of PPDU detection (or packet detection). Further, the time-domain signal corresponding to the ELR identifier sequence designed in this application has a low PAPR, which can effectively reduce nonlinear errors and improve the efficiency of the power amplifier (PA).

[0202] In this application, unless otherwise specified, the same or similar parts between various embodiments or implementations can be referred to each other. In the various embodiments of this application, and in the various implementation methods / methods / implementations within each embodiment, unless otherwise specified or logically conflicting, the terminology and / or descriptions between different embodiments and between the various implementation methods / methods / implementations within each embodiment are consistent and can be mutually referenced. The technical features in different embodiments and the various implementation methods / methods / implementations within each embodiment can be combined according to their inherent logical relationships to form new embodiments, implementation methods, methods, or implementation approaches. The embodiments described below do not constitute a limitation on the scope of protection of this application.

[0203] In this application, the "time-domain signal corresponding to the ELR signature sequence" can be understood as the time-domain signal obtained after the ELR signature sequence (which is a frequency-domain sequence) undergoes an inverse Fourier transform. Similarly, the "time-domain signal corresponding to the traditional STF sequence" can be understood as the time-domain signal obtained after the traditional STF sequence (which is a frequency-domain sequence) undergoes an inverse Fourier transform. Further details will not be elaborated upon below.

[0204] The communication device in this application can support IEEE protocols, such as IEEE 802.11bn / UHR / Wi-Fi 8, or next-generation protocols of IEEE 802.11bn. Of course, the communication device in this application can also support IEEE 802.11be / Wi-Fi 7 / EHT, IEEE Integrated mmWave / IMMW, IEEE 802.15 / UWB, or IEEE 802.11bf / sensing. The communication device in this application can also support Spark Link / NearLink standard protocols, etc., which are not listed here.

[0205] In one possible implementation, the first communication device in this application can be the AP or STA in Figure 1 above, and the corresponding second communication device can be the STA or AP in Figure 1 above. Of course, the first communication device in this application can also be an AP MLD or a non-AP MLD, and correspondingly, the second communication device in this application can be a non-AP MLD or an AP MLD; this application does not impose any restrictions.

[0206] Referring to Figure 7, Figure 7 is a schematic flowchart of an ELR communication method provided in an embodiment of this application. As shown in Figure 7, the ELR communication method includes, but is not limited to, the following steps:

[0207] S101, the first communication device generates an ELR PPDU, which includes a first field. The first field is generated based on an ELR identifier sequence, which is carried on 53 subcarriers with subcarrier indices from -26 to 26. All elements of the ELR identifier sequence on the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are 0.

[0208] S102, the first communication device sends the ELR PPDU.

[0209] Correspondingly, the second communication device receives the ELR PPDU.

[0210] In one possible implementation, the aforementioned ELR PPDU may include, but is not limited to, one or more of the following: a Legacy preamble field, an ELR preamble field, and an ELR data field. For example, the structure of this ELR PPDU may be as shown in Figure 3 above. The Legacy preamble field and the ELR data field are described above and will not be repeated here.

[0211] In one possible implementation, the ELR preamble field may include, but is not limited to, the first field. For example, the ELR preamble field may also include one or more of the following: ELR-LTF or ELR-SIG. For instance, the structure of the ELR preamble field may be as shown in Figure 4 above. The explanations of ELR-LTF and ELR-SIG are provided above and will not be repeated here. The first field can be used to implement one or more of the following functions: PPDU detection (or packet detection), AGC adjustment, or PPDU synchronization. For example, the first field may be the ELR identifier sequence field in Figure 4 above. More exemplarily, the first field may include two fields: the ELR identifier sequence field and ELR-STF, as shown in Figure 4 above. The ELR identifier sequence field can be used to identify that the PPDU carrying the ELR identifier sequence field is an ELR PPDU, enabling packet detection and corresponding format detection of the ELR PPDU; the ELR-STF can be used for AGC adjustment and PPDU synchronization.

[0212] In one possible implementation, the first field mentioned above can be generated based on the ELR-Signature Sequence. In other words, the ELR-Signature Sequence field and / or the ELR-STF can be generated based on the ELR-Signature Sequence. Specifically, the ELR-Signature Sequence in this embodiment can be a frequency domain sequence, which can be converted into a time domain signal through inverse Fourier transform (e.g., inverse fast Fourier transform, IFFT). The bandwidth of the ELR-Signature Sequence can be 20MHz, within which there are 64 subcarriers. The ELR-Signature Sequence can be carried on 53 subcarriers with subcarrier indices from -26 to 26. For example, the specific content of the ELR-Signature Sequence can be found in the description below, which will not be detailed here.

[0213] It is understood that in practical applications, the “ELR identifier sequence” in this application embodiment may have other names, such as “ELR sequence” or “first sequence”, etc., and this application embodiment is not limited.

[0214] In one possible implementation, the first communication device generates and transmits an ELR PPDU. The ELR PPDU includes a first field, which is generated based on the ELR identifier sequence of this application embodiment. This application embodiment mainly focuses on the generation and transmission process of the first field. For example, referring to Figure 8, Figure 8 is a schematic diagram of the generation and transmission process of the first field provided by this application embodiment. As shown in Figure 8, the first communication device can modulate based on the ELR identifier sequence of this application embodiment, for example, modulating the ELR identifier sequence onto 53 subcarriers with subcarrier indices from -26 to 26; then it can undergo subsequent processing (e.g., cyclic shift diversity (CSD), spatial mapping, inverse discrete Fourier transform (IDFT), guard interval (GI), and windowing, etc.), and finally transmit it through analog and radio frequency (Analog and RF) operations.

[0215] In one possible implementation, the ELR identifier sequence in this embodiment may include three elements: "1", "-1", and "0". All elements of this ELR identifier sequence on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are 0. Each element of this ELR identifier sequence is carried on a single subcarrier. It can be understood that the non-zero elements of a traditional STF sequence are carried on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}. Therefore, in this embodiment of the application, all elements of the ELR identifier sequence on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are 0, so that the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the traditional STF sequence is 0 at any time offset. This can effectively reduce the situation of misidentifying other PPDUs as ELR PPDUs and improve the accuracy of PPDU detection (or packet detection).

[0216] In one possible implementation, the ELR identifier sequence has non-zero values ​​(such as 1 or -1) on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, and can have zero values ​​on other subcarriers. Each element of the ELR identifier sequence is carried on a single subcarrier. For example, in addition to having all elements of 0 on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, the ELR identifier sequence may also have elements of 0 on the subcarrier with subcarrier indices {-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5,-3,-1,0,1,3,5,7,9,11,13,15,17,19,21,23,25}.

[0217] It is understood that the non-zero elements of the ELR identifier sequence in the embodiments of this application may be located only on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, so that the time-domain signal corresponding to the ELR identifier sequence has periodicity. For example, the time-domain signal corresponding to the ELR identifier sequence repeats twice within the duration of an OFDM symbol, thereby reducing the processing complexity of the receiver.

[0218] In one possible implementation, considering the symmetry of the spectral amplitude, the subcarrier indices corresponding to non-zero elements in the ELR identifier sequence can be symmetric about subcarrier index {0}. In other words, if the element carried by subcarrier index i is non-zero, then the element carried by subcarrier index -i is also non-zero, and the absolute value of i is less than or equal to 26.

[0219] In one possible implementation, the number of non-zero elements in the ELR identifier sequence is 10, 12, or 14.

[0220] The following examples illustrate the ELR identifier sequences provided in this application, along with their design principles and performance. For ease of understanding, the design principles of the ELR identifier sequences in this application will be introduced first, followed by some possible ELR identifier sequences based on these principles, and finally, the performance of the ELR identifier sequences (autocorrelation performance, cross-correlation performance, and PAPR, etc.) will be described.

[0221] Let there be frequency domain sequences X(k) and Y(k), k = -26, -25, -24, ..., -2, -1, 0, 1, 2, ..., 24, 25, 26. The time domain signal x(n) corresponding to the frequency domain sequence X(k) is shown in Equation (2-1) below, and the time domain signal y(n) corresponding to the frequency domain sequence Y(k) is shown in Equation (2-2) below.

[0222] Where N equals 64, representing the number of subcarriers within a certain 20MHz bandwidth.

[0223] The periodic cross-correlation function of x(n) and y(n) is shown in the following formula (2-3).

[0224] in: y * (n+m) N Represents y(n+m) N . conjugate.

[0225] The normalized periodic cross-correlation function is defined as shown in formula (1-1) above. Based on the properties of the Fast Fourier Transform (FFT) and Inverse Fast Fourier Transform (IFFT), we know that:

[0226] Therefore, the periodic cross-correlation function of the time-domain signals (or time-domain sequences) x(n) and y(n) is equal to that of the frequency-domain sequence X(-k)Y. * The Inverse Fast Fourier Transform (IFFT) of (-k). Where, Y * (-k) represents the conjugate of Y(-k).

[0227] Therefore, when the element-wise product of the designed ELR identifier sequence and the traditional STF sequence at corresponding positions is 0, the periodic cross-correlation function between their corresponding time-domain signals is 0 for any time offset. Furthermore, because the traditional STF sequence (S... -26,26 The non-zero elements of the ELR identifier sequence are carried on the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}. Therefore, the elements of the ELR identifier sequence designed in this embodiment are all 0 on the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}. This ensures that the normalized periodic cross-correlation between the time-domain signals corresponding to the ELR identifier sequence and the traditional STF sequence is 0 at all time offsets, thereby effectively reducing the possibility of misclassifying other PPDUs as ELR PPDUs and improving the accuracy of PPDU detection (or packet detection).

[0228] This application embodiment considers that the time-domain signal (or time-domain sequence) corresponding to the ELR identifier sequence has periodicity, which can reduce the processing complexity of the receiver. This application embodiment considers that the time-domain signal corresponding to the ELR identifier sequence is repeated twice within the duration of an OFDM symbol. Then, according to the properties of IFFT, the non-zero elements of the ELR identifier sequence can be located on some or all of the subcarriers with subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}. Meanwhile, considering that the normalized periodic cross-correlation between the time-domain signals corresponding to the ELR identifier sequence and the traditional STF sequence is 0 at all time offsets, the non-zero elements of the ELR identifier sequence designed in this application embodiment can be located on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}.

[0229] Furthermore, considering the symmetry of the spectral amplitude, if the element carried by subcarrier index i is a non-zero value (such as 1 or -1), then the element carried by subcarrier index -i is also a non-zero value (such as 1 or -1), and the absolute value of i is less than or equal to 26. It can be understood that since the non-zero elements of the ELR identifier sequence designed in this application embodiment are located on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, the value of i can be (4p+2), i.e., i = 4p+2, where p takes the value of one or more integers from -7 to 7 (i.e., -7,-6,-5,-4,-3,-2,-1,0,1,2,3,4,5,6,7).

[0230] In short, the ELR identifier sequence designed in the embodiments of this application satisfies one or more of the following constraints: (1) All elements of the ELR identifier sequence on the subcarrier with subcarrier index {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are 0; (2) The non-zero elements of the ELR identifier sequence are located on some or all of the subcarriers with subcarrier index {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}; (3) The subcarrier index corresponding to the non-zero element in the ELR identifier sequence is symmetric about the subcarrier index {0}.

[0231] In one possible implementation, under the constraints (1), (2), and (3) above, sequences with low PAPR (e.g., PAPR less than or equal to 3dB) and low autocorrelation sidelobes (e.g., the peak-to-sidelobe ratio of normalized periodic autocorrelation less than or equal to -9dB) are further considered. Examples of some possible ELR identifier sequences provided in embodiments of this application are illustrated below. It is understood that the sequences in the following examples (i.e., Examples 1a to 3a) can satisfy the constraints (1), (2), and (3) above, and the corresponding time-domain signals have a PAPR less than or equal to 3dB and a peak-to-sidelobe ratio of normalized periodic autocorrelation less than or equal to -9dB.

[0232] Example 1a

[0233] When the number of non-zero elements is 10, one possible ELR identifier sequence (for ease of description, denoted as ELRS) is... -26,26 (This will not be elaborated further below) as shown below:

[0234] ELRS -26,26 ={-1 0 0 0 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 0 0 0 1}……………………………………………………………………(2-5)

[0235] or,

[0236] ELRS -26,26 ={-1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1}……………………………………………………………………(2-6)

[0237] Example 2a

[0238] When the number of non-zero elements is 12, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0239] ELRS -26,26={0 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 0}……………………………………………………………………(2-7)

[0240] or,

[0241] ELRS -26,26 ={-1 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 1}……………………………………………………………………(2-8)

[0242] or,

[0243] ELRSA -26,26 ={-1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1}…………………………………………………………………(2-9)

[0244] or,

[0245] ELRSB -26,26 ={-1 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 1 0 0 0 -1}…………………………………………………………………(2-10)

[0246] Example 3a

[0247] When the number of non-zero elements is 14, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0248] ELRS -26,26={-1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1}……………………………………………………………………...(2-11)

[0249] or,

[0250] ELRS -26,26 ={-1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1}……………………………………………………………………(2-12)

[0251] or,

[0252] ELRSA -26,26 ={1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1}……………………………………………………………………(2-13)

[0253] or,

[0254] ELRSB -26,26 ={-1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1}…………………………………………………………………(2-14)

[0255] It is understood that the sequences in the above examples (i.e., Examples 1a to 3a) are merely examples, and any sequence that satisfies one or more of the following conditions is within the scope of protection of this application: all elements on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are 0; non-zero elements are located on some or all of the subcarriers with subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}; the subcarrier indices corresponding to the non-zero elements are symmetric about the subcarrier index {0}; the PAPR of the time-domain signal is less than or equal to 3dB; or the peak sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal is less than or equal to -9dB.

[0256] It can also be understood that, in practical applications, multiplying the sequences in the above examples (i.e., Examples 1a to 3a) by a normalization constant to obtain equivalent sequences still falls within the scope of protection of this application, and the performance of the equivalent sequences (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) remains unchanged. It can also be understood that inverting the elements of the sequences in the above examples (i.e., changing 1 to -1, -1 to 1, and leaving 0 unchanged), reversing the order, or uniformly sampling and inverting (let S(i) be the element value at subcarrier index i in the original sequence, then the value of the uniformly sampled and inverted sequence on the subcarrier at subcarrier index i is S(i)*(-1)). (i+26) / 4 Or (-S(i)*(-1)) (i+26) / 4 The equivalent sequence obtained by performing one or more of the following operations is also within the scope of protection of this application, and the performance of the equivalent sequence (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) remains unchanged. The symbol "*" indicates multiplication or multiplication by, which will not be elaborated further below.

[0257] The following examples illustrate (or demonstrate) the beneficial effects of the ELR identifier sequence designed in the embodiments of this application through the performance of the sequences in the above examples.

[0258] The PAPR of the time-domain signals corresponding to the sequences in the above examples (such as the ELR identifier sequences (2-5), (2-6), (2-7), (2-8), (2-9), (2-10), (2-11), (2-12), (2-13), (2-14)) are shown in Table 1 below.

[0259] Table 1

[0260] As shown in Table 1, the time-domain signal PAPR corresponding to the ELR identifier sequence designed in this application embodiment is less than or equal to 3dB, which has a very low PAPR, effectively reducing nonlinear error and improving the efficiency of the power amplifier (PA).

[0261] Referring to Figure 9, Figure 9 is a schematic diagram of the normalized periodic cross-correlation between the time-domain signals corresponding to the ELR identifier sequence and the traditional STF sequence provided in this application embodiment. In Figure 9, the horizontal axis represents the time shift in bits; the vertical axis represents the magnitude of the normalized periodic cross-correlation. As shown in Figure 9, the normalized periodic cross-correlation function between the ELR identifier sequence designed in this application embodiment (such as any one of ELR identifier sequences (2-5), (2-6), (2-7), (2-8), (2-9), (2-10), (2-11), (2-12), (2-13), (2-14)) and the time-domain signals corresponding to the traditional STF sequence is 0 for all time shifts, which can effectively reduce false detections of PPDU.

[0262] The peak sidelobes of the normalized periodic autocorrelation of the time-domain signals corresponding to the sequences in the above examples (such as the ELR identifier sequences (2-5), (2-6), (2-7), (2-8), (2-11), (2-12)) are shown in Table 2 below.

[0263] Table 2

[0264] As shown in Table 2, the peak-to-sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment is less than or equal to -9dB. It can be understood that the larger the absolute value of the peak-to-sidelobe ratio of the normalized periodic autocorrelation, the easier it is to distinguish the peak and sidelobes of the autocorrelation, which can improve the performance of the ELR receiver in PPDU detection (or packet detection) and improve the synchronization accuracy of the ELR PDU.

[0265] Furthermore, the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment can be generated by repeating or inverting a signal of one-quarter length within the duration of an OFDM symbol. Therefore, when performing correlation operations at the receiving end, its correlation length is only one-quarter of that of the OFDM symbol, which can effectively reduce the complexity of packet detection at the receiving end.

[0266] In another possible implementation, under the constraints (1), (2) and (3) above, this application embodiment considers designing a pair of sequences such that the time-domain signals corresponding to these two sequences have a low cross-correlation amplitude (e.g., the normalized periodic cross-correlation function amplitude is less than or equal to -6dB), and the PAPR of the time-domain signal corresponding to each sequence is low (e.g., PAPR is less than or equal to 3dB), and the autocorrelation sidelobes of the time-domain signal corresponding to each sequence are low (e.g., the peak sidelobe ratio of the normalized periodic autocorrelation is less than or equal to -9dB).

[0267] In some scenarios, the first field in the aforementioned ELR PPDU can be generated based on any sequence from the sequence pair designed in the embodiments of this application. One sequence in the sequence pair can be used to indicate one type of spatial stream number (e.g., single stream) of ELR data in the ELR PPDU, and the other sequence can be used to indicate another type of spatial stream number (e.g., multiple streams) of ELR data. This can save signaling overhead, eliminating the need for additional signaling to indicate the spatial stream number of ELR data.

[0268] The following examples illustrate some possible sequence pairs provided in the embodiments of this application. It can be understood that each sequence in the sequence pairs in the following examples can satisfy the above constraints (1), (2) and (3), and the PAPR of the corresponding time-domain signal is less than or equal to 3dB, the peak sidelobe ratio of the normalized periodic autocorrelation is less than or equal to -9dB, and the amplitude of the normalized periodic cross-correlation function between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -6dB.

[0269] Example 1b

[0270] When the number of non-zero elements in each sequence is 12, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0271] ELRSA -26,26 ={-1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1}…………………………………………………………………(2-15)

[0272] and,

[0273] ELRSB -26,26={-1 0 0 0 -1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 0 0 0 1 0 0 0 -1}…………………………………………………………………(2-16)

[0274] Example 2b

[0275] When the number of non-zero elements in each sequence is 14, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0276] ELRSA -26,26 ={1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1}……………………………………………………………………(2-17)

[0277] and,

[0278] ELRSB -26,26 ={-1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1}…………………………………………………………………(2-18)

[0279] It is understood that the sequence pairs in the above examples (i.e., Example 1b and Example 2b) are merely examples, and any sequence pair that satisfies one or more of the following conditions is within the scope of protection of this application: the elements of each sequence on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are all 0; the non-zero elements of each sequence are located on subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,- On some or all of the subcarriers of the sequence {4,-2,2,6,8,10,12,14,16,18,20,22,24,26}, the subcarrier indices corresponding to the non-zero elements in each sequence are symmetric about the subcarrier index {0}, the normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -6dB, the PAPR of the time-domain signal corresponding to each sequence is less than or equal to 3dB, or the peak sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal corresponding to each sequence is less than or equal to -9dB.

[0280] It can also be understood that, in practical applications, multiplying one or more sequences of the sequence pairs in the above examples (i.e., Examples 1b and 2b) by a normalization constant to obtain equivalent sequences still falls within the scope of protection of this application, and the performance of the equivalent sequence (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) and the performance of the sequence pairs containing the equivalent sequence remain unchanged. It can also be understood that inverting the elements of one or more sequences of the sequence pairs in the above examples (i.e., changing 1 to -1, -1 to 1, and leaving 0 unchanged), reversing the order, or uniformly sampling and inverting (let S(i) be the element value at subcarrier index i of the original sequence, then the value of the uniformly sampled and inverted sequence on the subcarrier at subcarrier index i is S(i)*(-1)) (i+26) / 4 Or (-S(i)*(-1)) (i+26) / 4 The equivalent sequence obtained by one or more of the operations is also within the scope of protection of this application, and the performance of the equivalent sequence (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) and the performance of the sequence pair containing the equivalent sequence remain unchanged.

[0281] It is understandable that the performance of the time-domain signals corresponding to the sequences in the above examples (i.e., Examples 1b and 2b) (such as the ELR identifier sequences (2-15), (2-16), (2-17), and (2-18)) is as shown in Table 3 below. Table 3 shows the PAPR, normalized periodic autocorrelation peak-side lobe ratio (PSLR), and the peak value of the normalized periodic cross-correlation between the time-domain signals corresponding to the ELR identifier sequences.

[0282] Table 3

[0283] As shown in Table 3, the PAPR of the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment is less than or equal to 3dB. It has a very low PAPR, which can effectively reduce nonlinear error and improve the efficiency of power amplifier (PA).

[0284] The normalized periodic cross-correlation function between any ELR identifier sequence (such as any one of ELR identifier sequences (2-15), (2-16), (2-17), (2-18)) in the sequence pair designed in this application and the time domain signal corresponding to the traditional STF sequence is 0 for all time offsets, which can effectively reduce the false detection of PPDU.

[0285] Furthermore, the sequence pairs designed in this application have low cross-correlation amplitudes, and different ELR identifier sequences can be used to indicate signaling information (such as different spatial stream numbers of ELR data) to save signaling overhead. Refer to Figure 10a, which is a schematic diagram of normalized periodic cross-correlation between time-domain signals corresponding to a sequence pair provided in this application embodiment. Refer to Figure 10b, which is a schematic diagram of normalized periodic cross-correlation between time-domain signals corresponding to another sequence pair provided in this application embodiment. Figure 10a shows the normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to sequence pairs (2-15) and (2-16) in Example 1b above. Figure 10b shows the normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to sequence pairs (2-17) and (2-18) in Example 2b above. The horizontal axis of Figures 10a and 10b represents time shift in bits; the vertical axis represents the amplitude of the normalized periodic cross-correlation. As shown in Figure 10a, the amplitude of the normalized periodic cross-correlation function between the time-domain signals corresponding to sequence pairs (2-15) and (2-16) in Example 1b above is less than 0.5 (20lg(0.5) is approximately -6dB). As shown in Figure 10b, the amplitude of the normalized periodic cross-correlation function between the time-domain signals corresponding to sequence pairs (2-17) and (2-18) in Example 2b above is less than 0.5 (20lg(0.5) is approximately -6dB). Here, lg() represents the logarithm to the base 10, which will not be elaborated further below.

[0286] In the sequence pairs designed in this application, the peak-to-sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal corresponding to any ELR identifier sequence (such as any one of ELR identifier sequences (2-15), (2-16), (2-17), and (2-18)) is less than or equal to -9dB. It can be understood that a larger peak-to-sidelobe ratio of the normalized periodic autocorrelation makes it easier to distinguish the autocorrelation peak and sidelobes, thereby improving the performance of the ELR receiver in PPDU detection (or packet detection).

[0287] Furthermore, in the sequence pair designed in this application embodiment, the time domain signal corresponding to any ELR identifier sequence (such as any one of ELR identifier sequences (2-15), (2-16), (2-17), (2-18)) can be generated by repeating or inverting a signal of one-quarter length within the duration of an OFDM symbol. Therefore, when performing correlation operations at the receiving end, its correlation length is only one-quarter of that of the OFDM symbol, which can effectively reduce the complexity of packet detection at the receiving end.

[0288] S103, the second communication device performs PPDU detection based on the first field in the above-mentioned ELR PPDU.

[0289] In one possible implementation, the second communication device receives the aforementioned ELR PPDU, which includes a first field that can be generated based on the ELR identifier sequence designed in the embodiments of this application. The second communication device can perform PPDU detection (or packet detection) based on the cross-correlation result between the local signal and the received signal (such as the time-domain signal of the received first field). The second communication device can be a conventional receiver (or conventional device) or an ELR receiver. It is understood that if the second communication device is a conventional receiver (or conventional device), the local signal is the time-domain signal corresponding to the conventional STF sequence. If the second communication device is an ELR receiver, the local signal is the time-domain signal corresponding to the ELR identifier sequence. For example, if the second communication device is a conventional receiver (or conventional device), the second communication device can calculate the (normalized) periodic cross-correlation result between the time-domain signal corresponding to the conventional STF sequence and the time-domain signal of the received first field to determine whether a conventional PPDU exists. For example, if the second communication device is an ELR receiver, the second communication device can calculate the (normalized) periodic cross-correlation result between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal of the received first field to determine whether an ELR PPDU exists. It is understood that the method of PPDU detection (or packet detection) in this embodiment is the same as or similar to the prior art, and will not be described in detail here.

[0290] This application embodiment designs an ELR identifier sequence with zero periodic cross-correlation with a traditional STF sequence in the time domain, effectively reducing the misclassification of other PPDUs as ELR PPDUs and improving the accuracy of PPDU detection (or packet detection). Furthermore, the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment has good autocorrelation performance (e.g., the peak-to-sidelobe ratio of normalized periodic autocorrelation is less than or equal to -9dB), which can reduce the number of times the ELR receiver misclassifies an ELR PPDU as not being an ELR PPDU, improving the performance of PPDU detection (or packet detection). Further, the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment has a low PAPR (e.g., less than or equal to 3dB), which can effectively reduce nonlinear errors and improve the efficiency of the power amplifier (PA). Moreover, when the ELR identifier sequence designed in this application embodiment performs correlation operations at the receiver, its correlation length is only one-quarter that of an OFDM symbol, effectively reducing the complexity of packet detection at the receiver. Furthermore, the ELR identifier sequence designed in this application embodiment is any sequence in the sequence pair, which can support the use of different ELR identifier sequences to indicate different spatial stream numbers of ELR data, so as to save signaling overhead.

[0291] Referring to Figure 11, Figure 11 is another schematic flowchart of the ELR communication method provided in an embodiment of this application. As shown in Figure 11, the ELR communication method includes, but is not limited to, the following steps:

[0292] S201, the first communication device generates an ELR PPDU, which includes a first field. This first field is generated based on an ELR identifier sequence, which is carried on 53 subcarriers with subcarrier indices from -26 to 26. Specifically, the elements of the ELR identifier sequence on the subcarriers with subcarrier indices {-24, 24} are non-zero values, and the elements on some or all of the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are non-zero values. Furthermore, the elements of the ELR identifier sequence on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26} are non-zero values. Alternatively, the ELR identifier sequence is a sequence in a predefined sequence pair in which at least one sequence has non-zero elements on the subcarrier with subcarrier index {-24,24}, any sequence in the sequence pair has non-zero elements on some or all of the subcarriers with subcarrier index {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, and has non-zero elements on some or all of the subcarriers with subcarrier index {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}.

[0293] S202, the first communication device sends the ELR PPDU.

[0294] Correspondingly, the second communication device receives the ELR PPDU.

[0295] In one possible implementation, the aforementioned ELR PPDU may include, but is not limited to, one or more of the following: a Legacy preamble field, an ELR preamble field, and an ELR data field. For example, the structure of this ELR PPDU may be as shown in Figure 3 above. The Legacy preamble field and the ELR data field are described above and will not be repeated here.

[0296] In one possible implementation, the ELR preamble field may include, but is not limited to, the first field. For example, the ELR preamble field may also include one or more of the following: ELR-LTF or ELR-SIG. For instance, the structure of the ELR preamble field may be as shown in Figure 4 above. The explanations of ELR-LTF and ELR-SIG are provided above and will not be repeated here. The first field can be used to implement one or more of the following functions: PPDU detection (or packet detection), AGC adjustment, or PPDU synchronization. For example, the first field may be the ELR identifier sequence field in Figure 4 above. More exemplarily, the first field may include two fields: the ELR identifier sequence field and ELR-STF, as shown in Figure 4 above. The ELR identifier sequence field can be used to identify that the PPDU carrying the ELR identifier sequence field is an ELR PPDU, enabling packet detection and corresponding format detection of the ELR PPDU; the ELR-STF can be used for AGC adjustment and PPDU synchronization.

[0297] In one possible implementation, the first field can be generated based on the ELR-Signature Sequence. In other words, the ELR-Signature Sequence field and / or the ELR-STF can be generated based on the ELR-Signature Sequence. The generation and transmission process of the first field can be referred to the description in Figure 8 above, and will not be repeated here. The ELR-Signature Sequence in this embodiment can be a frequency domain sequence, which can be converted into a time domain signal through inverse Fourier transform (e.g., IFFT). The bandwidth of the ELR-Signature Sequence can be 20MHz, within which there are 64 subcarriers. The ELR-Signature Sequence can be carried on 53 subcarriers with subcarrier indices from -26 to 26. For example, the specific content of the ELR-Signature Sequence can be found in the description below, and will not be detailed here.

[0298] It is understood that in practical applications, the “ELR identifier sequence” in this application embodiment may have other names, such as “ELR sequence” or “first sequence”, etc., and this application embodiment is not limited.

[0299] In one possible implementation, the ELR identifier sequence in this embodiment may include three elements: "1", "-1", and "0". The elements of the ELR identifier sequence on some or all subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are non-zero values ​​(e.g., 1 or -1), and the elements of the ELR identifier sequence on some or all subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26} are non-zero values ​​(e.g., 1 or -1), while they can be zero values ​​on other subcarriers. One element of the ELR identifier sequence is carried on one subcarrier. It is understandable that some receivers in the network may use delay correlation of the received signal to detect PPDU in order to simplify complexity. Therefore, in order to reduce the possibility of these receivers misclassifying ELRPDU as traditional PPDU, the period of the time domain signal amplitude corresponding to the ELR identifier sequence cannot be 0.8µs (corresponding to 16 sampling points under a 20MHz bandwidth). Therefore, in the embodiments of this application, all non-zero elements of the ELR identifier sequence cannot be located only on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, or only on the subcarrier with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, thereby effectively reducing the possibility of misclassifying ELRPDU as traditional PPDU and improving the accuracy of PPDU detection (or packet detection).

[0300] It can also be understood that in the embodiments of this application, the non-zero elements of the ELR identifier sequence are located on all or part of the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, and on part or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}. This can make the time-domain signal corresponding to the ELR identifier sequence periodic. For example, within the duration of an OFDM symbol, the time-domain signal corresponding to the ELR identifier sequence repeats twice, thereby reducing the processing complexity of the receiver.

[0301] In one possible implementation, the ELR identifier sequence has all elements of 0 on the subcarrier with subcarrier indices {-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5,-3,-1,0,1,3,5,7,9,11,13,15,17,19,21,23,25}.

[0302] In one possible implementation, considering the symmetry of the spectral amplitude, the subcarrier indices corresponding to non-zero elements in the ELR identifier sequence can be symmetric about subcarrier index {0}. In other words, if the element carried by subcarrier index i is non-zero, then the element carried by subcarrier index -i is also non-zero, and the absolute value of i is less than or equal to 26.

[0303] In one possible implementation, the number of non-zero elements in the ELR identifier sequence is 12, 14, 16, 18, 20, 22, 24, or 26.

[0304] In one possible implementation, the ELR identifier sequence has non-zero elements (such as 1 or -1) on the subcarrier with subcarrier indices {-24, 24}. In another possible implementation, the ELR identifier sequence is a sequence from a predefined sequence pair, in which at least one sequence has non-zero elements (such as 1 or -1) on the subcarrier with subcarrier indices {-24, 24}.

[0305] The following examples illustrate the ELR identifier sequences provided in this application, along with their design principles and performance. For ease of understanding, the design principles of the ELR identifier sequences in this application will be introduced first, followed by some possible ELR identifier sequences based on these principles, and finally, the performance of the ELR identifier sequences (autocorrelation performance, cross-correlation performance, and PAPR, etc.) will be described.

[0306] The design concept of the ELR identifier sequence in this embodiment is similar to that in the embodiment shown in Figure 7. From the aforementioned formulas (2-1), (2-2), (2-3), and (2-4), it can be seen that the periodic cross-correlation function of the time-domain signal (or time-domain sequence) x(n) and y(n) is equal to that of the frequency-domain sequence (X(-k)Y). * The Inverse Fast Fourier Transform (IFFT) of (-k)). Where, Y * (-k) represents the conjugate of Y(-k). In this embodiment, it is considered that when the time offset is 0, the periodic cross-correlation function between the time-domain signals corresponding to the ELR identifier sequence and the traditional STF sequence is 0, and at non-zero time offsets, the normalized periodic cross-correlation function has a lower amplitude. This can effectively reduce the situation of misclassifying other PPDUs as ELR PPDUs and improve the accuracy of PPDU detection (or packet detection).

[0307] Furthermore, this application embodiment takes into account that some receivers in the network can use the received signal r to simplify complexity. k Delay correlation is used to detect PPDU. For example, according to the following formulas (3-1) and (3-2), c n and p nThe ratio of the amplitude is used for PPDU detection, such as when When the value is greater than or equal to a certain threshold, it indicates that a PPDU has been detected.

[0308] Where L represents the length of the correlation window when performing correlation, and D represents the period of the time-domain signal corresponding to the traditional STF sequence, for example, D equals 16. Indicates r n+k+D . conjugate.

[0309] Therefore, to reduce the possibility of receivers misidentifying ELRPDUs as traditional PPDUs, the period of the time-domain signal amplitude corresponding to the ELR identifier sequence cannot be 0.8µs (corresponding to 16 sampling points under a 20MHz bandwidth). Thus, in this embodiment, all non-zero elements of the ELR identifier sequence cannot be located only on subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, or only on subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}.

[0310] This application embodiment also considers that the time-domain signal (or time-domain sequence) corresponding to the ELR identifier sequence has periodicity, which can reduce the processing complexity of the receiver. This application embodiment considers that the time-domain signal corresponding to the ELR identifier sequence repeats twice within the duration of an OFDM symbol. Then, according to the properties of IFFT, the non-zero elements of the ELR identifier sequence can be located on some or all of the subcarriers with subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}. Meanwhile, considering the condition that the period of the time-domain signal amplitude corresponding to the ELR identifier sequence cannot be 0.8µs, the non-zero elements of the ELR identifier sequence designed in this application embodiment are located on some or all of the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, and are located on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}.

[0311] The embodiments of this application also consider the symmetry of the spectrum amplitude. If the element carried by subcarrier index i is a non-zero value (such as 1 or -1), then the element carried by subcarrier index -i is also a non-zero value (such as 1 or -1), and the absolute value of i is less than or equal to 26. It is understood that, since the non-zero elements of the ELR identifier sequence designed in this application embodiment are located on some or all of the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, and on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}, the value of i can be (2p), that is, i = 2p, where the value of p is one or more integers from -13 to 13 (i.e.: -13,-12,-11,…,-3,-2,-1,0,1,2,3,…,11,12,13).

[0312] In short, the ELR identifier sequence designed in the embodiments of this application satisfies one or more of the following constraints: (1) The non-zero elements of the ELR identifier sequence are located on some or all of the subcarriers with subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}; (2) The ELR identifier sequence All non-zero elements cannot be located only on the subcarrier with subcarrier index {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, or only on the subcarrier with subcarrier index {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}; (3) The subcarrier index corresponding to the non-zero element in the ELR identifier sequence is symmetric about the subcarrier index {0}. Among them, the constraints (1) and (2) can also be summarized as follows: the elements of the ELR identifier sequence on some or all subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24} are non-zero values, and the elements of the ELR identifier sequence on some or all subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26} are non-zero values.

[0313] In one possible implementation, under the constraints (1), (2), and (3) above, a sequence with a low PAPR (e.g., PAPR less than or equal to 3.01 dB after 8x upsampling), a low cross-correlation amplitude in the time domain corresponding to the traditional STF sequence (e.g., peak value of normalized periodic cross-correlation less than or equal to -6 dB), and a low autocorrelation amplitude after a delay of 16 sampling points (or a delay of 0.8 μs) (e.g., normalized periodic autocorrelation amplitude less than or equal to -10 dB after a delay of 0.8 μs; and / or, peak-to-sidelobe ratio of normalized periodic autocorrelation less than or equal to -8 dB after a delay of 0.8 μs) is further illustrated below. Examples of some possible ELR identifier sequences provided in the embodiments of this application are given below. It is understood that the sequences in the following examples (i.e., Examples 1c to 8c) can satisfy the above constraints (1), (2) and (3), and the PAPR of the corresponding time-domain signal after 8 times upsampling is less than or equal to 3.01dB, the value of the normalized periodic cross-correlation at time offset of 0 is 0 and the peak value of the normalized periodic cross-correlation is less than or equal to -6dB, the amplitude of the normalized periodic autocorrelation after a delay of 0.8us is less than or equal to -10dB and the peak sidelobe ratio of the normalized periodic autocorrelation after a delay of 0.8us is less than or equal to -8dB.

[0314] Example 1c

[0315] When the number of non-zero elements is 12, one possible ELR identifier sequence (for ease of description, denoted as ELRS) is... -26,26 (This will not be elaborated further below) as shown below:

[0316] ELRS -26,26 ={0 0 -1 0 0 0 1 0 -1 0 0 0 0 0 -1 0 0 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 -1 0 0 0 0 1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0}………………………………………………………………….(3-3)

[0317] Example 2c

[0318] When the number of non-zero elements is 14, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0319] ELRS -26,26={-1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 -1 0 1 0 0 0 0 0 1 0 -1 0 1}…………………………………………………………………….(3-4)

[0320] or,

[0321] ELRS -26,26 ={-1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 -1 0 1 0 0 0 0 0 1 0 -1 0 1}…………………………………………………………………….(3-5)

[0322] or,

[0323] ELRS -26,26 ={0 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 -1 0 -1 0 1 0 0 0 0 0 1 0 0}………………………………………………………………….(3-6)

[0324] Example 3c

[0325] When the number of non-zero elements is 16, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0326] ELRS -26,26 ={0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0}………………………………………………………………….(3-7)

[0327] or,

[0328] ELRS -26,26={0 0 -1 0 0 0 -1 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 1 0 0 0 0 0 1 0 -1 0 0 0 -1 0 0}………………………………………………………………….(3-8)

[0329] or,

[0330] ELRS -26,26 ={1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1}…………………………………………………………………….(3-9)

[0331] or,

[0332] ELRS -26,26 ={0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0}………………………………………………………………….(3-10)

[0333] or,

[0334] ELRS -26,26 ={0 0 -1 0 0 0 1 0 -1 0 0 0 0 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0}………………………………………………………………….(3-11)

[0335] or,

[0336] ELRS -26,26={1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1}…………………………………………………………………….(3-12)

[0337] Example 4c

[0338] When the number of non-zero elements is 18, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0339] ELRS -26,26 ={0 0 -1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 0}…………………………………………………………………(3-13)

[0340] or,

[0341] ELRS -26,26 ={0 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0}……………………………………………………………………(3-14)

[0342] or,

[0343] ELRS -26,26 ={-1 0 0 0 0 0 -1 0 1 0 0 0 1 0 -1 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 -1 0 0 0 1 0 1 0 0 0 0 0 -1}…………………………………………………………………(3-15)

[0344] or,

[0345] ELRS -26,26={0 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0}……………………………………………………………………(3-16)

[0346] or,

[0347] ELRS -26,26 ={0 0 -1 0 1 0 1 0 1 0 -1 0 0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0 0 1 0 1 0 -1 0 1 0 1 0 0}……………………………………………………………………(3-17)

[0348] or,

[0349] ELRS -26,26 ={0 0 -1 0 -1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 -1 0 0 0 0 0 -1 0 0 0 1 0 -1 0 1 0 0}………………………………………………………………(3-18)

[0350] or,

[0351] ELRS -26,26 ={0 0 -1 0 0 0 1 0 1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 -1 0 0 0 1 0 0}………………………………………………………………(3-19)

[0352] or,

[0353] ELRS -26,26={1 0 -1 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 1 0 -1 0 1 0 1 0 1 0 0 0 0 0 -1 0 -1 0 -1}…………………………………………………………………(3-20)

[0354] Example 5c

[0355] When the number of non-zero elements is 20, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0356] ELRS -26,26 ={-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}……………………………………………………………………(3-21)

[0357] or,

[0358] ELRS -26,26 ={-1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 0 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 -1 0 1}………………………………………………………………(3-22)

[0359] or,

[0360] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}……………………………………………………………………(3-23)

[0361] or,

[0362] ELRS -26,26={1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 0 0 -1}…………………………………………………………...…………(3-24)

[0363] or,

[0364] ELRS -26,26 ={-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}……………………………………………………………………(3-25)

[0365] or,

[0366] ELRS -26,26 ={-1 0 0 0 -1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 1}……………………………………………………………………(3-26)

[0367] or,

[0368] ELRS -26,26 ={-1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1}…………………………………………………………………(3-27)

[0369] or,

[0370] ELRS -26,26={0 0 -1 0 1 0 1 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 1 0 -1 0 0}……………………………………………………………………(3-28)

[0371] or,

[0372] ELRS -26,26 ={1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 -1}………………………………………………………………(3-29)

[0373] or,

[0374] ELRS -26,26 ={-1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 1 0 1 0 0 0 -1}………………………………………………………………(3-30)

[0375] or,

[0376] ELRS -26,26 ={-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}……………………………………………………………………(3-31)

[0377] Example 6c

[0378] When the number of non-zero elements is 22, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0379] ELRS -26,26={-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(3-32)

[0380] or,

[0381] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}…………………………………………………………………(3-33)

[0382] or,

[0383] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(3-34)

[0384] or,

[0385] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(3-35)

[0386] or,

[0387] ELRS -26,26={-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 1}………………………………………………………………(3-36)

[0388] Example 7c

[0389] When the number of non-zero elements is 24, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0390] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 1 0 -1 0 -1 0 1 0 -1 0 -1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(3-37)

[0391] or,

[0392] ELRS -26,26 ={-1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 1 0 1 0 -1 0 -1}………………………………………………………………(3-38)

[0393] or,

[0394] ELRS -26,26 ={-1 0 -1 0 1 0 1 0 1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 1 0 -1 0 1 0 -1}………………………………………………………………(3-39)

[0395] or,

[0396] ELRS -26,26={-1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 -1 0 1 0 1 0 -1}………………………………………………………………(3-40)

[0397] or,

[0398] ELRS -26,26 ={1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 0 0 -1 0 -1 0 0 0 -1 0 1 0 1 0 -1 0 1 0 -1}………………………………………………………………(3-41)

[0399] or,

[0400] ELRS -26,26 ={-1 0 -1 0 1 0 1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 -1 0 -1}………………………………………………………………(3-42)

[0401] or,

[0402] ELRS -26,26 ={-1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 1 0 1 0 -1}………………………………………………………………(3-43)

[0403] Example 8c

[0404] When the number of non-zero elements is 26, one possible ELR identifier sequence is ELRS. -26,26 As shown below:

[0405] ELRS -26,26={-1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 -1}………………………………………………………………(3-44)

[0406] or,

[0407] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 1 0 1}………………………………………………………………(3-45)

[0408] or,

[0409] ELRS -26,26 ={-1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(3-46)

[0410] or,

[0411] ELRS -26,26 ={1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 -1 0 -1}………………………………………………………………(3-47)

[0412] It is understood that the sequences in the above examples (i.e., Examples 1c to 8c) are merely examples, and any sequence that satisfies one or more of the following conditions is within the scope of protection of this application: The non-zero element is located on some or all of the subcarriers with subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}; the non-zero element cannot be located only on the subcarrier with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, or only on the subcarrier with subcarrier indices {- On subcarriers of {26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}; the subcarrier indices corresponding to non-zero elements are symmetric about subcarrier index {0}; the PAPR of the time-domain signal after 8 times upsampling is less than or equal to 3.01dB; the normalized periodic cross-correlation between the time-domain signals corresponding to the traditional STF sequence is 0 at time offset 0 and the peak value of the normalized periodic cross-correlation is less than or equal to -6dB; or, the normalized periodic autocorrelation amplitude of the time-domain signal after a delay of 0.8us is less than or equal to -10dB and the peak sidelobe ratio of the normalized periodic autocorrelation after a delay of 0.8us is less than or equal to -8dB.

[0413] It can also be understood that, in practical applications, multiplying the sequences in the above examples (i.e., Examples 1c to 8c) by a normalization constant to obtain equivalent sequences still falls within the scope of protection of this application, and the performance of the equivalent sequences (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) remains unchanged. It can also be understood that inverting the elements of the sequences in the above examples (i.e., changing 1 to -1, -1 to 1, and leaving 0 unchanged), reversing the order, or uniformly sampling and inverting (let S(i) be the element value at subcarrier index i in the original sequence, then the value of the uniformly sampled and inverted sequence on the subcarrier at subcarrier index i is S(i)*(-1)) (i+26) / 2 Or (-S(i)*(-1)) (i+26) / 2 The equivalent sequence obtained by performing one or more of the following operations is also within the scope of protection of this application, and the performance of the equivalent sequence (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) remains unchanged. The symbol "*" indicates multiplication or multiplication by, which will not be elaborated further below.

[0414] The following examples illustrate (or demonstrate) the beneficial effects of the ELR identifier sequence designed in the embodiments of this application through the performance of the sequences in the above examples.

[0415] The performance of the time-domain signals corresponding to the sequences in the above examples (such as ELR identifier sequences (3-3) to (3-47)) is shown in Table 4 below. Table 4 shows: the PAPR of the time-domain signal corresponding to the ELR identifier sequence after 8x upsampling, the peak side lobe ratio (PSLR) of the normalized periodic autocorrelation after a delay of 0.8 μs, the peak value of the normalized periodic autocorrelation after a delay of 0.8 μs, and the peak value of the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the traditional STF (L-STF) sequence.

[0416] Table 4

[0417] As shown in Table 4 above, the PAPR of the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment after 8-fold upsampling is no higher than 3.01dB, which can effectively reduce nonlinear distortion and improve the transmit efficiency of the power amplifier (PA). The normalized periodic autocorrelation peak-to-sidelobe ratio (PSLR) of the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment after a delay of 0.8µs is less than -8dB, which can improve the synchronization accuracy of the ELR PPDU. In addition, the normalized periodic autocorrelation of the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment after a delay of 0.8µs is less than -10dB, which can reduce the situation where traditional devices mistakenly identify the ELR PPDU as a traditional PPDU. Moreover, the ELR identifier sequence designed in this application embodiment is orthogonal to the traditional STF sequence, and the normalized periodic cross-correlation amplitude between its time-domain signal and the time-domain signal corresponding to the traditional STF (L-STF) sequence is less than -6dB, which can further reduce the problem of PPDU false detection.

[0418] Furthermore, the time-domain signal corresponding to the ELR identifier sequence designed in this application is repeated twice within the duration of an OFDM symbol, which can effectively reduce the complexity of packet detection at the receiver.

[0419] In another possible implementation, under the constraints (1), (2) and (3) above, this application embodiment considers designing a pair of sequences such that the time-domain signals corresponding to these two sequences have a low cross-correlation amplitude (e.g., the normalized periodic cross-correlation function amplitude is less than or equal to -9dB), and the PAPR of the time-domain signal corresponding to each sequence after 8 times upsampling is low (e.g., PAPR is less than or equal to 3.01dB), the autocorrelation of the time-domain signal corresponding to each sequence after a delay of 16 sampling points (or a delay of 0.8us) has a low amplitude (e.g., the normalized periodic autocorrelation amplitude after a delay of 0.8us is less than or equal to -10dB; and / or, the normalized periodic autocorrelation peak-sidelobe ratio after a delay of 0.8us is less than or equal to -8dB), and the time-domain signals corresponding to each sequence and the traditional STF sequence have a low cross-correlation amplitude (e.g., the peak value of the normalized periodic cross-correlation is less than or equal to -6dB).

[0420] In some scenarios, the first field in the aforementioned ELR PPDU can be generated based on any sequence from the sequence pair designed in the embodiments of this application. One sequence in the sequence pair can be used to indicate one type of spatial stream number (e.g., single stream) of ELR data in the ELR PPDU, and the other sequence can be used to indicate another type of spatial stream number (e.g., multiple streams) of ELR data. This can save signaling overhead, eliminating the need for additional signaling to indicate the spatial stream number of ELR data.

[0421] The following examples illustrate some possible sequence pairs provided in the embodiments of this application. It can be understood that each sequence in the sequence pairs in the following examples can satisfy the above constraints (1), (2) and (3), and the PAPR of the corresponding time-domain signal after 8 times upsampling is less than or equal to 3.01dB, the normalized periodic autocorrelation amplitude after a delay of 0.8us is less than or equal to -10dB, the peak-to-sidelobe ratio of the normalized periodic autocorrelation after a delay of 0.8us is less than or equal to -8dB, the peak value of the normalized periodic cross-correlation between the time-domain signals corresponding to each sequence and the traditional STF sequence is less than or equal to -6dB, and the amplitude of the normalized periodic cross-correlation function between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -9dB.

[0422] Example 1d

[0423] When the number of non-zero elements in each sequence is 14, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0424] ELRSA -26,26={-1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 -1 0 1 0 0 0 0 0 1 0 -1 0 1}……………………………………………………………………(4-1)

[0425] and,

[0426] ELRSB -26,26 ={0 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 0 0 -1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 -1 0 -1 0 1 0 0 0 0 0 1 0 0}…………………………………………………………………(4-2)

[0427] Example 2d

[0428] When the number of non-zero elements in each sequence is 16, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0429] ELRSA -26,26 ={1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1}……………………………………………………………………(4-3)

[0430] and,

[0431] ELRSB -26,26 ={0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0}…………………………………………………………………(4-4)

[0432] When the number of non-zero elements in each sequence is 16, another possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB-26,26 As shown below:

[0433] ELRSA -26,26 ={0 0 -1 0 0 0 1 0 -1 0 0 0 0 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 0 0 1 0 1 0 0 0 -1 0 0}…………………………………………………………………(4-5)

[0434] and,

[0435] ELRSB -26,26 ={1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 0 0 1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1}……………………………………………………………………(4-6)

[0436] Example 3d

[0437] When the number of non-zero elements in each sequence is 18, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0438] ELRSA -26,26 ={-1 0 0 0 0 0 -1 0 1 0 0 0 1 0 -1 0 -1 0 1 0 -1 0 -1 0 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0 -1 0 0 0 1 0 1 0 0 0 0 0 -1}…………………………………………………………………(4-7)

[0439] and,

[0440] ELRSB -26,26 ={0 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 0 0}……………………………………………………………………(4-8)

[0441] When the number of non-zero elements in each sequence is 18, another possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0442] ELRSA -26,26 ={0 0 -1 0 1 0 1 0 1 0 -1 0 0 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 1 0 0 0 -1 0 1 0 0 0 1 0 0 0 1 0 1 0 -1 0 1 0 1 0 0}……………………………………………………………………(4-9)

[0443] and,

[0444] ELRSB -26,26 ={0 0 -1 0 -1 0 -1 0 0 0 -1 0 0 0 0 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 -1 0 0 0 0 0 -1 0 0 0 1 0 -1 0 1 0 0}………………………………………………………………(4-10)

[0445] When the number of non-zero elements in each sequence is 18, another possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0446] ELRSA -26,26 ={0 0 -1 0 0 0 1 0 1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 0 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0 -1 0 0 0 1 0 0}………………………………………………………………(4-11)

[0447] and,

[0448] ELRSB -26,26={1 0 -1 0 -1 0 0 0 0 0 1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 0 0 0 0 0 0 -1 0 0 0 1 0 -1 0 1 0 1 0 1 0 0 0 0 0 -1 0 -1 0 -1}………………………………………………………………(4-12)

[0449] Example 4d

[0450] When the number of non-zero elements in each sequence is 20, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0451] ELRSA -26,26 ={1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 1 0 -1 0 -1 0 0 0 1 0 1 0 0 0 1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 0 0 -1}………………………………………………………………(4-13)

[0452] and,

[0453] ELRSB -26,26 ={-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}………………………………………………………………(4-14)

[0454] When the number of non-zero elements in each sequence is 20, another possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0455] ELRSA -26,26 ={-1 0 0 0 -1 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 1}………………………………………………………………(4-15)

[0456] and,

[0457] ELRSB -26,26 ={-1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1}………………………………………………………………(4-16)

[0458] When the number of non-zero elements in each sequence is 20, there is another possible sequence pair (containing two ELR identifier sequences ELRSA). -26,26 and ELRSB -26,26 As shown below:

[0459] ELRSA -26,26 ={0 0 -1 0 1 0 1 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 1 0 -1 0 0}………………………………………………………………(4-17)

[0460] and,

[0461] ELRSB -26,26 ={1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 1 0 0 0 -1 0 0 0 1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 -1}………………………………………………………………(4-18)

[0462] When the number of non-zero elements in each sequence is 20, there is another possible sequence pair (containing two ELR identifier sequences ELRSA). -26,26 and ELRSB -26,26 As shown below:

[0463] ELRSA -26,26={-1 0 0 0 1 0 -1 0 1 0 -1 0 0 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 0 0 1 0 1 0 1 0 1 0 0 0 -1}………………………………………………………………(4-19)

[0464] and,

[0465] ELRSB -26,26 ={-1 0 -1 0 0 0 -1 0 -1 0 0 0 1 0 0 0 -1 0 1 0 1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 0 0 1 0 -1 0 0 0 -1 0 1}………………………………………………………………(4-20)

[0466] Example 5d

[0467] When the number of non-zero elements in each sequence is 22, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0468] ELRSA -26,26 ={-1 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(4-21)

[0469] and,

[0470] ELRSB -26,26 ={-1 0 -1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 0 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 -1 0 -1 0 1 0 0 0 -1 0 1 0 0 0 -1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 1}………………………………………………………………(4-22)

[0471] Example 6d

[0472] When the number of non-zero elements in each sequence is 24, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0473] ELRSA -26,26 ={-1 0 -1 0 -1 0 -1 0 1 0 -1 0 1 0 0 0 -1 0 1 0 -1 0 -1 0 -1 0 0 0 -1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 -1 0 1 0 1 0 -1}………………………………………………………………(4-23)

[0474] and,

[0475] ELRSB -26,26 ={1 0 -1 0 -1 0 -1 0 -1 0 -1 0 1 0 0 0 1 0 -1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 1 0 -1 0 0 0 -1 0 1 0 1 0 -1 0 1 0 -1}………………………………………………………………(4-24)

[0476] When the number of non-zero elements in each sequence is 24, another possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0477] ELRSA -26,26 ={-1 0 -1 0 1 0 1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 -1 0 0 0 1 0 -1 0 -1 0 -1 0 -1 0 0 0 -1 0 1 0 -1 0 -1 0 -1}………………………………………………………………(4-25)

[0478] and,

[0479] ELRSB -26,26={-1 0 -1 0 1 0 -1 0 1 0 -1 0 -1 0 0 0 1 0 1 0 -1 0 1 0 1 0 0 0 1 0 1 0 -1 0 -1 0 0 0 -1 0 -1 0 1 0 1 0 1 0 -1}………………………………………………………………(4-26)

[0480] Example 7d

[0481] When the number of non-zero elements in each sequence is 26, one possible sequence pair (containing two ELR identifier sequences ELRSA) -26,26 and ELRSB -26,26 As shown below:

[0482] ELRSA -26,26 ={-1 0 -1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 1 0 0 0 -1 0 -1 0 1 0 1 0 -1 0 1 0 1 0 -1 0 1 0 -1 0 1}………………………………………………………………(4-27)

[0483] and,

[0484] ELRSB -26,26 ={1 0 -1 0 1 0 -1 0 1 0 1 0 -1 0 -1 0 -1 0 1 0 1 0 1 0 1 0 0 0 -1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 -1 0 -1 0 1 0 -1 0 -1}………………………………………………………………(4-28)

[0485] It is understood that the sequence pairs in the above examples (i.e., Examples 1d to 7d) are merely examples, and any sequence pair that satisfies one or more of the following conditions is within the scope of protection of this application: The non-zero elements of each sequence are located on some or all of the subcarriers with subcarrier indices {-26,-24,-22,-20,-18,-16,-14,-12,-10,-8,-6,-4,-2,2,6,8,10,12,14,16,18,20,22,24,26}; the non-zero elements of each sequence cannot be located only on the subcarriers with subcarrier indices {-24,-20,-16,-12,-8,-4,4,8,12,16,20,24}, or only on the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,26}. On subcarriers of {6,10,14,18,22,26}; the subcarrier indices corresponding to the non-zero elements of each sequence are symmetric about the subcarrier index {0}; the normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -9dB; the PAPR of the time-domain signal corresponding to each sequence after 8 times upsampling is less than or equal to 3.01dB; the normalized periodic cross-correlation value between the time-domain signals corresponding to each sequence and the traditional STF sequence is 0 at a time offset of 0 and the peak value of the normalized periodic cross-correlation is less than or equal to -6dB; or, the normalized periodic autocorrelation amplitude of the time-domain signal corresponding to each sequence after a delay of 0.8us is less than or equal to -10dB and the peak sidelobe ratio of the normalized periodic autocorrelation after a delay of 0.8us is less than or equal to -8dB.

[0486] It can also be understood that, in practical applications, multiplying the sequences in the above examples (i.e., examples 1d to 7d) by a normalization constant to obtain equivalent sequences still falls within the scope of protection of this application, and the performance of the equivalent sequences (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) remains unchanged. It can also be understood that inverting the elements of the sequences in the above examples (i.e., changing 1 to -1, -1 to 1, and leaving 0 unchanged), reversing the order, or uniformly sampling and inverting (let S(i) be the element value at subcarrier index i in the original sequence, then the value of the uniformly sampled and inverted sequence on the subcarrier at subcarrier index i is S(i)*(-1)). (i+26) / 2 Or (-S(i)*(-1)) (i+26) / 2 The equivalent sequence obtained by performing one or more of the following operations is also within the scope of protection of this application, and the performance of the equivalent sequence (such as autocorrelation performance, cross-correlation performance, and PAPR, etc.) remains unchanged. The symbol "*" indicates multiplication or multiplication by, which will not be elaborated further below.

[0487] It is understandable that the performance of the time-domain signals corresponding to the sequences in the above examples (such as ELR identifier sequences (4-1) to (4-28)) is as shown in Table 5 below. Table 5 shows: the PAPR of the time-domain signal corresponding to the ELR identifier sequence after 8x upsampling, the peak side lobe ratio (PSLR) of the normalized periodic autocorrelation after a delay of 0.8 μs, the peak value of the normalized periodic autocorrelation after a delay of 0.8 μs, the peak value of the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the traditional STF (L-STF) sequence, and the peak value of the normalized periodic cross-correlation between the time-domain signals corresponding to the two sequences in the sequence pair.

[0488] Table 5

[0489] As shown in Table 5 above, the peak value of the normalized periodic cross-correlation between the time-domain signals corresponding to the two sequences in the sequence pair designed in this application embodiment is no greater than -9dB. Different ELR identifier sequences can be used to indicate signaling information (such as different spatial stream numbers of ELR data), which can save signaling overhead.

[0490] As shown in Table 5 above, the PAPR of the time-domain signal corresponding to any ELR identifier sequence in the sequence pair designed in this application embodiment, after being upsampled by 8 times, is no higher than 3.01dB, which can effectively reduce nonlinear distortion and improve the transmit efficiency of the power amplifier (PA). The normalized periodic autocorrelation peak-to-sidelobe ratio (PSLR) of the time-domain signal corresponding to any ELR identifier sequence in the sequence pair designed in this application embodiment is less than -9dB after a delay of 0.8us, which can improve the synchronization accuracy of the ELR PPDU. Furthermore, the normalized periodic autocorrelation of the time-domain signal corresponding to any ELR identifier sequence in the sequence pair designed in this application embodiment is less than -10dB after a delay of 0.8us, which can reduce the possibility of traditional devices mistaking the ELR PPDU for a traditional PPDU.

[0491] In the sequence pairs designed in this application embodiment, any ELR identifier sequence is orthogonal to the traditional STF sequence, and the normalized periodic cross-correlation amplitude between its time domain signal and the time domain signal corresponding to the traditional STF (L-STF) sequence is less than -6dB, which can further reduce the problem of PPDU false detection.

[0492] Furthermore, in the sequence pair designed in this application embodiment, the time-domain signal corresponding to any ELR identifier sequence is repeated twice within the duration of an OFDM symbol, which can effectively reduce the complexity of packet detection at the receiver.

[0493] S203, the second communication device performs PPDU detection based on the first field in the above-mentioned ELR PPDU.

[0494] In one possible implementation, the implementation of step S203 in this embodiment can be referred to the implementation of step S103 in the embodiment shown in FIG7 above, which will not be repeated here.

[0495] This application embodiment designs an ELR identifier sequence with a low amplitude of periodic cross-correlation in the time domain with a traditional STF sequence (e.g., the peak value of the normalized periodic cross-correlation is less than or equal to -6dB), which effectively reduces the possibility of misclassifying other PPDUs as ELR PPDUs and improves the accuracy of PPDU detection (or packet detection). Furthermore, the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment has good autocorrelation performance (e.g., the peak-to-sidelobe ratio of the normalized periodic autocorrelation is greater than or equal to -8dB), which can reduce the possibility of the ELR receiver misclassifying ELR PPDUs as not being ELR PPDUs, thus improving the performance of PPDU detection (or packet detection). Further, the time-domain signal corresponding to the ELR identifier sequence designed in this application embodiment has a low PAPR (e.g., less than or equal to 3.01dB), which can effectively reduce nonlinear errors and improve the efficiency of the power amplifier (PA). Moreover, when the ELR identifier sequence designed in this application embodiment is used for correlation operations at the receiver, its correlation length is only one-quarter that of an OFDM symbol, which can effectively reduce the complexity of packet detection at the receiver. Furthermore, the ELR identifier sequence designed in this application embodiment is any sequence in the sequence pair, which can support the use of different ELR identifier sequences to indicate different spatial stream numbers of ELR data, so as to save signaling overhead.

[0496] The foregoing details the method provided in this application. To facilitate the implementation of the above-described solutions in the embodiments of this application, corresponding apparatus or devices are also provided in the embodiments of this application.

[0497] 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 12 to 14.

[0498] Referring to Figure 12, which is a structural schematic diagram of a communication device provided in an embodiment of this application, the communication device includes a transceiver module 801 and a processing module 802. The transceiver module 801 can implement corresponding communication functions, and the processing module 802 is used for data processing. The transceiver module 801 can also be referred to as an interface, a communication interface, or a communication module, etc.

[0499] In some embodiments of this application, the communication device may be the first communication device shown above. That is, the communication device shown in FIG12 may be used to perform the steps or functions performed by the first communication device in the above method embodiments. For example, the communication device may be the first communication device or a chip or functional module configured in the first communication device, etc., and this application embodiment does not limit this. The transceiver module 801 is used to perform the transceiver-related operations of the first communication device in the above method embodiments, and the processing module 802 is used to perform the processing-related operations of the first communication device in the above method embodiments.

[0500] For example, processing module 802 is used to generate an ELR PPDU, which includes a first field generated based on an ELR identifier sequence; transceiver module 801 is used to transmit the ELR PPDU. The ELR identifier sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26, and all elements of the ELR identifier sequence on the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are 0.

[0501] Understandably, transceiver module 801 can send the ELR PPDU to other communication devices, or it can output the ELR PPDU from processing module 802 to other components or functional modules in the communication device. The explanations for other information output by the transceiver module are similar and will not be detailed below.

[0502] In this embodiment of the application, the description of ELR PPDU, the first field, and the ELR identifier sequence can be found in the above method embodiment, and will not be described in detail here.

[0503] It is understood that the specific descriptions of the transceiver module and processing module shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver module and processing module, please refer to the above method embodiments (as shown in Figure 7), which will not be detailed here. In addition, the technical effects of the embodiments of this application are the same as those in the foregoing method embodiments (as shown in Figure 7), and for the sake of brevity, they will not be repeated here.

[0504] For example, processing module 802 is used to generate an ELR PPDU, which includes a first field generated based on an ELR identifier sequence; transceiver module 801 is used to transmit the ELR PPDU. The ELR identifier sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. Elements of the ELR identifier sequence on subcarriers with subcarrier indices {-24, 24} are non-zero values, and elements on some or all of the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are non-zero values. Furthermore, elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26} are non-zero values. Alternatively, the ELR identifier sequence is a sequence from a predefined sequence pair, in which at least one sequence has non-zero elements on the subcarrier with subcarrier indices {-24, 24}. Any sequence in this pair has non-zero elements on some or all of the subcarriers {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24}, and also has non-zero elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26}.

[0505] In this embodiment of the application, the description of ELR PPDU, the first field, and the ELR identifier sequence can be found in the above method embodiment, and will not be described in detail here.

[0506] It is understood that the specific descriptions of the transceiver module and processing module shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver module and processing module, please refer to the above-described method embodiments (as shown in Figure 11), which will not be detailed here. In addition, the technical effects of the embodiments of this application are the same as those in the aforementioned method embodiments (as shown in Figure 11), and for the sake of brevity, they will not be repeated here.

[0507] Reusing Figure 12, in some other embodiments of this application, the communication device may be the second communication device shown above. That is, the communication device shown in Figure 12 may be used to perform the steps or functions performed by the second communication device in the above method embodiments. For example, the communication device may be the second communication device or a chip or functional module configured in the second communication device, etc., and this application embodiment does not limit this. The transceiver module 801 is used to perform the transceiver-related operations of the second communication device in the above method embodiments, and the processing module 802 is used to perform the processing-related operations of the second communication device in the above method embodiments.

[0508] For example, transceiver module 801 is used to receive ELR PPDU, which includes a first field generated based on an ELR identifier sequence; processing module 802 is used to perform PPDU detection based on the first field. The ELR identifier sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26, and all elements of the ELR identifier sequence on the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are 0.

[0509] Understandably, transceiver module 801 can receive ELR PPDUs from other communication devices, or it can input ELR PPDUs from other components or functional modules within the communication device. Similar explanations are provided for other information input by the transceiver module, and will not be detailed further below.

[0510] In this embodiment of the application, the description of ELR PPDU, the first field, and the ELR identifier sequence can be found in the above method embodiment, and will not be described in detail here.

[0511] It is understood that the specific descriptions of the transceiver module and processing module shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver module and processing module, please refer to the above method embodiments (as shown in Figure 7), which will not be detailed here. In addition, the technical effects of the embodiments of this application are the same as those in the foregoing method embodiments (as shown in Figure 7), and for the sake of brevity, they will not be repeated here.

[0512] For example, transceiver module 801 is used to receive an ELR PPDU, which includes a first field generated based on an ELR identifier sequence; processing module 802 is used to perform PPDU detection based on the first field. The ELR identifier sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. The elements of the ELR identifier sequence on subcarriers with subcarrier indices {-24, 24} are non-zero values, and the elements on some or all of the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are non-zero values. Furthermore, the elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26} are non-zero values. Alternatively, the ELR identifier sequence is a sequence from a predefined sequence pair, in which at least one sequence has non-zero elements on the subcarrier with subcarrier indices {-24, 24}. Any sequence in the sequence pair has non-zero elements on some or all of the subcarriers {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24}, and also has non-zero elements on some or all of the subcarriers with subcarrier indices {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26}.

[0513] In this embodiment of the application, the description of ELR PPDU, the first field, and the ELR identifier sequence can be found in the above method embodiment, and will not be described in detail here.

[0514] It is understood that the specific descriptions of the transceiver module and processing module shown in the embodiments of this application are merely examples. For the specific functions or execution steps of the transceiver module and processing module, please refer to the above-described method embodiments (as shown in Figure 11), which will not be detailed here. In addition, the technical effects of the embodiments of this application are the same as those in the aforementioned method embodiments (as shown in Figure 11), and for the sake of brevity, they will not be repeated here.

[0515] The communication device of the present application embodiments has been described above. The following describes possible product forms of the communication device. It should be understood that any product possessing the functions of the communication device described in FIG12 above falls within the protection scope of the present application embodiments. It should also be understood that the following description is merely illustrative and does not limit the product form of the communication device of the present application embodiments to this.

[0516] In one possible implementation, in the communication device shown in FIG12, the processing module 802 may be one or more processors, and the transceiver module 801 may be a transceiver. Alternatively, the transceiver module 801 may also be a transmitting module and a receiving module, where the transmitting module may be a transmitter and the receiving module may be a receiver. The transmitting and receiving modules are integrated into a single device, such as a transceiver. In this embodiment, the processor and transceiver may be coupled, and the connection method between the processor and transceiver is not limited in this embodiment. During the execution of the above method, the process of sending information (such as sending an ELR PPDU) can be understood as the process of the processor outputting the information. When outputting the information, the processor outputs the information to the transceiver for transmission. After being output by the processor, the information may require further processing before reaching the transceiver. Similarly, the process of receiving information (such as receiving an ELR PPDU) in the above method can be understood as the process of the processor receiving the input information. When the processor receives the input information, the transceiver receives the information and inputs it into the processor. Furthermore, after the transceiver receives the aforementioned information, the information may need to undergo further processing before being input into the processor.

[0517] Referring to Figure 13, which is another structural schematic diagram of the communication device provided in an embodiment of this application, the communication device may be a first communication device or a second communication device, or a chip therein. Figure 13 only shows the main components of the communication device. In addition to the processor 1001, the communication device may further include a transceiver 1002, a memory 1003, and input / output devices (not shown in the figure).

[0518] The processor 1001 is mainly used to process communication protocols and communication data, control the entire communication device, execute software programs, and process the data of the software programs. The memory 1003 is mainly used to store software programs and data. In one design, the transceiver 1002 can be called a transceiver unit, transceiver, or transceiver circuit, etc., and is used to implement the transceiver function. The transceiver 1002 may include a receiver and a transmitter. The receiver can be called a receiver or receiving circuit, etc., and is used to implement the receiving function; the transmitter can be called a transmitter or transmitting circuit, etc., and is used to implement the transmitting function. In another design, the transceiver 1002 may include a control circuit and an antenna. The control circuit is mainly used for the conversion between baseband signals and radio frequency signals and the processing of radio frequency signals. The antenna is mainly used for transmitting and receiving radio frequency signals in the form of electromagnetic waves. Input / output devices, such as touch screens, displays, and keyboards, are mainly used to receive user input data and output data to the user.

[0519] When the communication device is powered on, the processor 1001 can read the software program in the memory 1003, interpret and execute the instructions of the software program, process the data of the software program, and control the medium access control (MAC) layer and physical layer (PHY) to implement the method of this application embodiment. When it is necessary to transmit data wirelessly, the processor 1001 performs baseband processing on the data to be transmitted and outputs the baseband signal to the radio frequency (RF) circuit. The RF circuit performs RF processing on 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 1001. The processor 1001 converts the baseband signal into data and processes the data.

[0520] 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.

[0521] The processor 1001, transceiver 1002, and memory 1003 can be connected via a communication bus.

[0522] For example, when the communication device is used to perform the steps, methods, or functions performed by the first communication device in the method embodiment shown in FIG7, the processor 1001 may be used to perform step S101 in FIG7, and / or to perform other processes of the technology described herein; the transceiver 1002 may be used to perform step S102 in FIG7, and / or to perform other processes of the technology described herein.

[0523] For example, when the communication device is used to perform the steps, methods, or functions performed by the second communication device in the method embodiment shown in FIG7, the processor 1001 may be used to perform step S103 in FIG7, and / or to perform other processes of the technology described herein; the transceiver 1002 may be used to receive ELR PPDU, and / or to perform other processes of the technology described herein.

[0524] For example, when the communication device is used to perform the steps, methods, or functions performed by the first communication device in the method embodiment shown in FIG11, the processor 1001 may be used to perform step S201 in FIG11, and / or to perform other processes of the technology described herein; the transceiver 1002 may be used to perform step S202 in FIG11, and / or to perform other processes of the technology described herein.

[0525] For example, when the communication device is used to perform the steps, methods, or functions performed by the second communication device in the method embodiment shown in FIG11, the processor 1001 may be used to perform step S203 in FIG11, and / or to perform other processes of the technology described herein; the transceiver 1002 may be used to receive ELR PPDU, and / or to perform other processes of the technology described herein.

[0526] In any of the above designs, the processor 1001 may include a transceiver for implementing receiving and transmitting functions. For example, the transceiver may be a transceiver circuit, an interface, or an interface circuit. The transceiver circuit, interface, or interface circuit for implementing receiving and transmitting functions may be separate or integrated. The aforementioned transceiver circuit, interface, or interface circuit may be used for reading and writing code / data, or it may be used for transmitting or relaying signals.

[0527] In any of the above designs, the processor 1001 may store instructions, which may be computer programs. These computer programs, running on the processor 1001, cause the communication device to perform the methods described in the above method embodiments. The computer program may be embedded in the processor 1001; in this case, the processor 1001 may be implemented in hardware.

[0528] In one implementation, the communication device may include circuitry capable of performing the functions of transmitting, receiving, or communicating as described in the foregoing method embodiments. The processor and transceiver described in this application can be implemented on integrated circuits (ICs), analog ICs, radio frequency integrated circuits (RFICs), mixed-signal ICs, application-specific integrated circuits (ASICs), printed circuit boards (PCBs), electronic devices, etc. The processor and transceiver can also be manufactured using various IC process technologies, such as complementary metal oxide semiconductors (CMOS), n-metal-oxide-semiconductor (NMOS), positive channel metal oxide semiconductors (PMOS), bipolar junction transistors (BJTs), bipolar CMOS (BiCMOS), silicon germanium (SiGe), gallium arsenide (GaAs), etc.

[0529] It is understood that the communication device shown in the embodiments of this application may have more components than those in Figure 13, and the embodiments of this application do not limit this. The methods executed by the processor and transceiver shown above are merely examples, and the specific steps executed by the processor and transceiver can be referred to the description of the method embodiments above.

[0530] In another possible implementation, in the communication device shown in FIG12, the processing module 802 can be one or more logic circuits, and the transceiver module 801 can be an input / output interface, or a communication interface, or an interface circuit, or an interface, etc. Alternatively, the transceiver module 801 can also be a sending module and a receiving module. The sending module can be an output interface, and the receiving module can be an input interface. The sending module and the receiving module are integrated into one module, such as an input / output interface. Referring to FIG14, FIG14 is another structural schematic diagram of the communication device provided in the embodiments of this application. As shown in FIG14, the communication device shown in FIG14 includes a logic circuit 901 and an interface 902. That is, the above-mentioned processing module 802 can be implemented by the logic circuit 901, and the transceiver module 801 can be implemented by the interface 902. Among them, the logic circuit 901 can be a chip, a processing circuit, an integrated circuit, or a system on chip (SoC) chip, etc., and the interface 902 can be a communication interface, an input / output interface, a pin, etc. For example, FIG14 shows the above-mentioned communication device as a chip, which includes a logic circuit 901 and an interface 902.

[0531] In this embodiment, the logic circuit and the interface can also be coupled to each other. The specific connection method between the logic circuit and the interface is not limited in this embodiment.

[0532] For example, when the communication device is used to perform the method, function or step performed by the first communication device in any of the foregoing method embodiments, logic circuit 901 is used to generate an ELR PPDU, which includes a first field generated based on an ELR identifier sequence; interface 902 is used to output the ELR PPDU.

[0533] For example, when the communication device is used to perform the method, function or step performed by the second communication device in any of the foregoing method embodiments, the interface 902 is used to input an ELR PPDU, the ELR PPDU including a first field, the first field being generated based on an ELR identifier sequence; and the logic circuit 901 is used to perform PPDU detection based on the first field.

[0534] In the embodiments of this application, the specific descriptions of ELR PPDU, the first field, and the ELR identifier sequence can be found in any of the foregoing method embodiments, and will not be described in detail here.

[0535] It is understood that 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 in software form, etc., and the embodiments of this application do not limit it in this way.

[0536] For specific implementations of the embodiment shown in Figure 14, please refer to the above embodiments, which will not be described in detail here.

[0537] This application also provides a wireless communication system, which includes a first communication device and a second communication device. The first communication device and the second communication device can be used to execute the methods in any of the foregoing method embodiments.

[0538] In addition, this application also provides a computer program for implementing the operations and / or processes performed by the first communication device in the method provided in this application.

[0539] This application also provides a computer program for implementing the operations and / or processes performed by the second communication device in the method provided in this application.

[0540] This application also provides a readable storage medium storing a program that is executed by one or more processors, causing a device including the one or more processors to perform the operations and / or processes performed by the first communication device in the method provided in this application.

[0541] This application also provides a readable storage medium storing a program that is executed by one or more processors, causing a device including the one or more processors to perform the operations and / or processes performed by the second communication device in the method provided in this application.

[0542] This application also provides a computer program product, which includes computer code or a computer program that, when run on a computer, causes the operations and / or processes performed by the first communication device in the method provided in this application to be executed.

[0543] This application also provides a computer program product, which includes computer code or a computer program that, when run on a computer, causes the operations and / or processes performed by the second communication device in the method provided in this application to be executed.

[0544] In the embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative. For instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices, or units, or it may be an electrical, mechanical, or other form of connection.

[0545] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected according to actual needs to achieve the technical effects of the solutions provided in the embodiments of this application.

[0546] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0547] If the integrated unit is implemented as a software functional unit 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.

[0548] 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. An enhanced long-distance ELR communication method, characterized in that, include: An enhanced long-range ELR physical layer protocol data unit (PPDU) is generated. The ELR PPDU includes a first field, which is generated based on an ELR identifier sequence. The ELR identifier sequence is carried on 53 subcarriers with subcarrier indices from -26 to 26. All elements of the ELR identifier sequence on the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} are 0. Send the ELR PPDU.

2. An enhanced long-distance ELR communication method, characterized in that, include: The receiver receives an enhanced long-range ELR physical layer protocol data unit (PPDU), the ELR PPDU including a first field, the first field being generated based on an ELR identifier sequence, the ELR identifier sequence being carried on 53 subcarriers with subcarrier indices from -26 to 26, and all elements of the ELR identifier sequence on the subcarriers with subcarrier indices {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24} being 0; PPDU detection is performed based on the first field.

3. The method according to claim 1 or 2, characterized in that, The peak-to-average power ratio (PAPR) of the time-domain signal corresponding to the ELR identifier sequence is less than or equal to 3 dB.

4. The method according to any one of claims 1 to 3, characterized in that, The peak sidelobe ratio of the normalized periodic autocorrelation of the time-domain signal corresponding to the ELR identifier sequence is less than or equal to -9dB.

5. The method according to any one of claims 1 to 4, wherein the elements of the ELR identifier sequence on some or all of the subcarriers with subcarrier indices {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26} are non-zero values.

6. The method according to any one of claims 1 to 5, characterized in that, The subcarrier indices corresponding to the non-zero elements in the ELR identifier sequence are symmetric about the subcarrier index {0}.

7. The method according to any one of claims 1 to 6, wherein the ELR identifier sequence has an element of 0 on the subcarrier with subcarrier index {-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5,-3,-1,0,1,3,5,7,9,11,13,15,17,19,21,23,25}.

8. The method according to any one of claims 1 to 7, characterized in that, The number of non-zero elements in the ELR identifier sequence is 10, 12, or 14.

9. The method according to any one of claims 1 to 8, characterized in that, The number of non-zero elements in the ELR identifier sequence is 14; The ELR identifier sequence is {-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0 1 0 0 0-1 0 0 0 1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 0 0-1 0 0 0 1}; or, The ELR identifier sequence is {-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 0 0 1}.

10. The method according to any one of claims 1 to 8, characterized in that, The ELR identifier sequence is any one of the predefined sequence pairs.

11. The method according to claim 10, characterized in that, The normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -6dB.

12. The method according to claim 10 or 11, characterized in that, The number of non-zero elements in each sequence pair is 14; The sequence pairs include: {1 0 0 0 1 0 0 0 1 0 0 0 1 0 0 0-1 0 0 0 1 0 0 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0 1 0 0 0-1}, and {-1 0 0 0-1 0 0 0 1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0-1 0 0 0-1}.

13. An enhanced long-distance ELR communication method, characterized in that, include: An enhanced long-range ELR physical layer protocol data unit (PPDU) is generated, the ELR PPDU including a first field, the first field being generated based on an ELR identifier sequence carried on 53 subcarriers with subcarrier indices from -26 to 26; The ELR identifier sequence has non-zero values ​​on the subcarrier with subcarrier index {-24,24} and non-zero values ​​on some or all of the subcarriers with subcarrier index {-20,-16,-12,-8,-4,4,8,12,16,20}, and the ELR identifier sequence has non-zero values ​​on some or all of the subcarriers with subcarrier index {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}. Alternatively, the ELR identifier sequence is a sequence in a predefined sequence pair, wherein at least one sequence in the sequence pair has non-zero elements on the subcarrier with subcarrier index {-24, 24}, and any sequence in the sequence pair has non-zero elements on some or all of the subcarriers with subcarrier index {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24}, and has non-zero elements on some or all of the subcarriers with subcarrier index {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26}. Send the ELR PPDU.

14. An enhanced long-distance ELR communication method, characterized in that, include: Receive enhanced long-range ELR physical layer protocol data unit (PPDU), the ELR PPDU including a first field, the first field being generated based on an ELR identifier sequence, the ELR identifier sequence being carried on 53 subcarriers with subcarrier indices from -26 to 26; The ELR identifier sequence has non-zero values ​​on the subcarrier with subcarrier index {-24,24} and non-zero values ​​on some or all of the subcarriers with subcarrier index {-20,-16,-12,-8,-4,4,8,12,16,20}, and the ELR identifier sequence has non-zero values ​​on some or all of the subcarriers with subcarrier index {-26,-22,-18,-14,-10,-6,-2,2,6,10,14,18,22,26}. Alternatively, the ELR identifier sequence is a sequence in a predefined sequence pair, wherein at least one sequence in the sequence pair has non-zero elements on the subcarrier with subcarrier index {-24, 24}, and any sequence in the sequence pair has non-zero elements on some or all of the subcarriers with subcarrier index {-24, -20, -16, -12, -8, -4, 4, 8, 12, 16, 20, 24}, and has non-zero elements on some or all of the subcarriers with subcarrier index {-26, -22, -18, -14, -10, -6, -2, 2, 6, 10, 14, 18, 22, 26}. PPDU detection is performed based on the first field.

15. The method according to claim 13 or 14, characterized in that, The PAPR of the time-domain signal corresponding to the ELR identifier sequence after 8-fold upsampling is less than or equal to 3.01dB.

16. The method according to any one of claims 13 to 15, characterized in that, The normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the traditional short training field L-STF sequence is 0 at a time offset of 0; and / or, The peak value of the normalized periodic cross-correlation between the time-domain signal corresponding to the ELR identifier sequence and the time-domain signal corresponding to the L-STF sequence is less than or equal to -6dB.

17. The method according to any one of claims 13 to 16, characterized in that, The time-domain signal corresponding to the ELR identifier sequence has a normalized periodic autocorrelation amplitude of less than or equal to -10 dB after a delay of 0.8 µs; and / or, The normalized periodic autocorrelation peak-to-sidelobe ratio of the time-domain signal corresponding to the ELR identifier sequence after a delay of 0.8 µs is less than or equal to -8 dB.

18. The method according to any one of claims 13 to 17, characterized in that, The ELR identifier sequence has all elements of 0 on the subcarrier with subcarrier indices {-25,-23,-21,-19,-17,-15,-13,-11,-9,-7,-5,-3,-1,0,1,3,5,7,9,11,13,15,17,19,21,23,25}.

19. The method according to any one of claims 13 to 18, characterized in that, The subcarrier indices corresponding to the non-zero elements in the ELR identifier sequence are symmetric about the subcarrier index {0}.

20. The method according to any one of claims 13 to 19, characterized in that, The number of non-zero elements in the ELR identifier sequence is 12, 14, 16, 18, 20, 22, 24, or 26.

21. The method according to any one of claims 13 to 20, characterized in that, The number of non-zero elements in the ELR identifier sequence is 14; The ELR identifier sequence is {-1 0-1 0-1 0 0 0 0 0 1 0 1 0 0 0-1 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 0 1 0 0 0-1 0 1 0 0 0 0 0 1 0-1 0 1}.

22. The method according to any one of claims 13 to 20, characterized in that, The number of non-zero elements in the ELR identifier sequence is 16; The ELR identifier sequence is {0 0-1 0 0 0-1 0-1 0 0 0 1 0 0 0-1 0 1 0-1 0-1 0 0 0 0 0 0 0 1 0-1 0-1 0-1 0 0 0 1 0 0 0-1 0 1 0 0 0 1 0 0}; or, The ELR identifier sequence is {0 0-1 0 0 0-1 0-1 0 0 0 0 0 1 0-1 0-1 0-1 0 0 0 1 0 0 0-1 0 0 0 1 0-1 0 1 0 1 0 0 0 0 0 1 0-1 0 0 0-1 0 0}.

23. The method according to any one of claims 13 to 20, characterized in that, The number of non-zero elements in the ELR identifier sequence is 18; The ELR identifier sequence is {0 0-1 0-1 0-1 0-1 0-1 0 0 0 1 0 0 0-1 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 1 0 0 0-1 0 0 0-1 0 0 0 1 0-1 0 1 0 0 0}; or, The ELR identifier sequence is {0 0-1 0-1 0-1 0 0 0-1 0-1 0 1 0 0 0-1 0 1 0 0 0-1 0 0 0-1 0 0 0 1 0 1 0 0 0-1 0-1 0 1 0 0 0 1 0-1 0 1 0 0 0 1 0-1 0 1 0 0}.

24. The method according to any one of claims 13 to 20, characterized in that, The normalized periodic cross-correlation function amplitude between the time-domain signals corresponding to the two sequences in the sequence pair is less than or equal to -9dB.

25. The method according to claim 24, characterized in that, The number of non-zero elements in each sequence pair is 14; The sequence pairs include: {-1 0-1 0-1 0 0 0 0 0 1 0 1 0 0 0-1 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 1 0 0 0-1 0 1 0 0 0 0 0 1 0-1 0 1} and {0 0-1 0 0 0 0 0 1 0-1 0-1 0-1 0-1 0 0 0 0 0-1 0 0 0 1 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0-1 0-1 0 1 0 0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0}.

26. The method according to claim 24, characterized in that, The number of non-zero elements in each sequence pair is 16; The sequence pairs include: {1 0-1 0-1 0-1 0 0 0 1 0-1 0 0 0-1 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 0 1 0 0 0 1 0 1 0-1 0-1 0-1} and {0 0-1 0 0 0-1 0-1 0 0 0 1 0 0 0-1 0 1 0-1 0-1 0 0 0 0 0 0 0 1 0-1 0-1 0-1 0 0 0 1 0 0 0-1 0 1 0 0 0 1 0 0 0 1 0 0 0}; or, The sequence pairs include: {0 0-1 0 0 0 1 0-1 0 0 0 0 0-1 0-1 0-1 0-1 0 0 0 1 0 0 0-1 0 0 0 1 0-1 0 1 0-1 0-1 0 0 0 0 0 1 0 1 0 0 0-1 0 0 0-1 0 0} and {1 0-1 0-1 0 0 0 1 0-1 0 0 0-1 0 0 0 0 0-1 0 0 0 0 0 0-1 0 0 0 0 0 1 0 0 0 1 0 1 0-1 0-1 0-1}.

27. The method according to claim 24, characterized in that, The number of non-zero elements in each sequence pair is 18; The sequence pairs include: {-1 0 0 0 0 0-1 0 1 0 0 0 1 0-1 0-1 0 1 0-1 0-1 0 0 0 0 0 0 1 0 1 0 1 0 1 0 1 0-1 0 0 0 1 0 1 0 0 0 0 0-1} and {0 0-1 0-1 0-1 0 0 0-1 0-1 0 1 0 0 0-1 0 1 0 0 0-1 0 0 0-1 0 0 0 1 0 1 0 0 0-1 0-1 0 1 0 0 0-1 0 1 0 0 0-1 0-1 0 1 0 0 0 1 0-1 0 1 0 0 0}; or, The sequence pairs include: {0 0-1 0 1 0 1 0 1 0-1 0 0 0-1 0 0 0-1 0-1 0 0 0 1 0 0 0 1 0 0 0-1 0 1 0 0 0 1 0 0 0 1 0 1 0-1 0 1 0 1 0 0} and {0 0-1 0 -1 0-1 0 0 0-1 0 0 0 0-1 0-1 0-1 0 1 0 1 0 0 0-1 0 1 0 1 0 1 0 -1 0 0 0 0 0-1 0 0 0 1 0-1 0 1 0 0}; or, The sequence pairs include: {0 0-1 0 0 0 1 0 1 0-1 0 0 0-1 0 1 0-1 0 1 0 0 0-1 0 0 0-1 0 0 0 1 0 1 0 1 0 1 0 0 0 1 0 1 0-1 0 0 0 1 0 0 0} and {1 0-1 0 -1 0 0 0 0 0 1 0-1 0-1 0-1 0 1 0 0 0-1 0 0 0 0 0 0-1 0 0 0 1 0 -1 0 1 0 1 0 1 0 0 0 0 0-1 0-1 0-1}.

28. A communication device, characterized in that, include: One or more processors, said one or more processors being coupled to one or more memories; The one or more memories are used to store computer programs, and the one or more processors are used to execute the computer programs stored in the one or more memories, so that the communication device performs the method as described in any one of claims 1 to 27.

29. A readable storage medium, characterized in that, The device is used to store a program, which is executed by one or more processors, such that a device including the one or more processors performs the method as described in any one of claims 1 to 27.

30. A computer program product, characterized in that, When the computer program product is executed, the method as described in any one of claims 1 to 27 is performed.

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