LTF sequence design for wide bandwidth 4x in wireless communications

Abstract

Various schemes related to four-times (4x) long training field (LTF) sequence design for wide bandwidth in wireless communications are described. A processor of an apparatus generates a physical layer protocol data unit (PPDU) LTF having a subcarrier spacing of 78.125 kHz using a predefined LTF base sequence. The apparatus then uses the PPDU to perform wireless communication in a bandwidth of 240 MHz, 480 MHz, or 640 MHz.

Description

[0001] Cross-references

[0002] This disclosure is part of a non-provisional patent application claiming priority to U.S. Provisional Patent Application No. 63 / 375,555, filed on September 14, 2022, the contents of which are incorporated herein by reference in their entirety. Technical Field

[0003] The present invention relates generally to wireless communications, and more particularly to techniques for designing a four times (4x) long-training field (LTF) sequence for wideband in wireless communications. Background Art

[0004] Unless otherwise indicated herein, the approaches described in this section are not prior art to the claims listed below and are not admitted to be prior art by inclusion in this section.

[0005] In wireless communications, such as Wi-Fi (or WiFi) and wireless local area networks (WLANs) that comply with one or more of the Institute of Electrical and Electronics Engineers (IEEE) 802.11 standards, achieving high throughput is one of the key goals for next-generation wireless connectivity. Wide bandwidths, such as 240 MHz, 480 MHz, and 640 MHz, have been considered as potential candidates for next-generation WLANs. However, how to achieve high throughput in wide bandwidths such as 240 MHz, 480 MHz, and 640 MHz remains undetermined. Therefore, there is a need to provide a solution for 4x LTF sequence design for wide bandwidths in wireless communications. Summary of the invention

[0006] The following summary of the invention is provided for reference only and is not intended to be limiting in any way. That is, the following summary of the invention is provided to introduce the concepts, highlights, benefits and advantages of the novel and non-obvious technologies described herein. Below the embodiments, a selection of embodiments is further described. Therefore, the following summary of the invention is not intended to identify the essential features of the claimed subject matter, nor is it intended to be used to determine the scope of the claimed subject matter.

[0007] The purpose of the scheme of the present invention is to provide schemes, concepts, designs, techniques, methods and devices for 4x LTF sequence design for broadband in wireless communication. According to the various schemes described herein, 4x LTF sequence design can be used for wide bandwidth, such as 240MHz, 480MHz and 640MHz. In addition, several design options are proposed, and the peak-to-average power ratio (PAPR) performance is evaluated for comparison. It is believed that the implementation of the proposed scheme can solve or alleviate the above problems.

[0008] In one aspect, a method may include generating LTFs of a physical-layer protocol data unit (PPDU) with 78.125 kHz subcarrier spacing using a predefined LTF base sequence. The method may also involve wireless communication in a 240 MHz, 480 MHz, or 640 MHz bandwidth using the PPDU.

[0009] In another aspect, an apparatus may include a transceiver and a processor coupled to the transceiver. The transceiver may be configured to perform wireless transmission and reception. The processor may be configured to generate LTFs with 78.125 kHz subcarrier spacing for a PPDU using a predefined LTF base sequence. The processor may also be configured to perform wireless communication using the PPDU in a 240 MHz, 480 MHz, or 640 MHz bandwidth.

[0010] It is worth noting that although the description described herein may involve certain radio access technologies, networks and network topologies (such as Wi-Fi), the proposed concepts, solutions and any variants / derivatives thereof can be implemented in other types of radio access technologies, networks and network topologies, such as but not limited to Bluetooth, ZigBee, Fifth Generation (5G) / New Radio (NR), LTE, LTE-Advanced, LTE-Advanced Pro, Internet of Things (IoT), Industrial Internet of Things (IIoT) and narrowband Internet of Things (NB-IoT). Therefore, the scope of the present invention is not limited to the examples described. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] The accompanying drawings are included to provide a further understanding of the present invention and are incorporated into and constitute a part of this disclosure. The accompanying drawings illustrate embodiments of the present invention and together with the description are used to explain the principles of the present disclosure. It should be understood that the drawings are not necessarily drawn to scale, as some components may be shown out of proportion to the size in actual implementation in order to clearly illustrate the concepts of the present disclosure.

[0012] Figure 1 is a schematic diagram of an example network environment in which various solutions and schemes according to the present invention may be implemented.

[0013] Figure 2 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0014] Figure 3A and Figure 3B Each is a corresponding part of an example design according to an embodiment of the present invention.

[0015] Figure 4 is a schematic diagram of an example design according to an embodiment of the present invention.

[0016] Figure 5 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0017] Figure 6 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0018] Figure 7 is a schematic diagram of an example design according to an embodiment of the present invention.

[0019] Figure 8 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0020] Fig. 9 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0021] Fig.10 is a schematic diagram of an example design according to an embodiment of the present invention.

[0022] Fig.11 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0023] Fig.12 is a schematic diagram of an example scenario according to an embodiment of the present invention.

[0024] Fig.13 is a block diagram of an example communication system according to an embodiment of the present invention.

[0025] Fig.14 is a flow chart of an example process according to an embodiment of the present invention. DETAILED DESCRIPTION

[0026] Detailed embodiments and implementations of the claimed subject matter are disclosed herein. However, it should be understood that the disclosed embodiments and implementations are merely illustrative of the claimed subject matter, which may be embodied in various forms. However, the present invention may be embodied in many different forms and should not be construed as being limited to the exemplary embodiments and implementations set forth herein. On the contrary, these exemplary embodiments and implementations are provided to make the description of the present invention thorough and complete, and to fully convey the scope of the present invention to those skilled in the art. In the following description, details of well-known features and technologies may be omitted to avoid unnecessarily obscuring the presented embodiments and implementations.

[0027] Overview

[0028] Embodiments according to the present invention relate to various techniques, methods, schemes and / or solutions related to wide bandwidth 4x LTF sequence design for wireless communication. According to the present invention, a variety of possible solutions may be implemented individually or in combination. That is, although these possible solutions may be described separately below, two or more of these possible solutions may be implemented in one combination or another combination.

[0029] It is noteworthy that in the present invention, a regular RU (rRU) refers to an RU having tones that are continuous (e.g., adjacent to each other) and not interlaced, staggered, or otherwise distributed. In addition, a 26-tone regular RU can be interchangeably represented as RU26 (or rRU26), a 52-tone regular RU can be interchangeably represented as RU52 (or rRU52), a 106-tone regular RU can be interchangeably represented as RU106 (or rRU106), a 242-tone regular RU can be interchangeably represented as RU242 (or rRU242), and so on. In addition, an aggregate (26+52) tone regular multi-RU (MRU) can be interchangeably represented as MRU78 (or rMRU78), an aggregate (26+106) tone regular MRU can be interchangeably represented as MRU132 (or rMRU132), and so on.

[0030] Since the above examples are merely illustrative examples and not an exhaustive list of all possibilities, the same applies to regular RUs of different sizes (or different numbers of tones), distributed-tone RUs, MRUs, and distributed-tone MRUs. It is also noteworthy that in the present invention, a bandwidth of 20 MHz can be interchangeably expressed as BW20 or BW20M, a bandwidth of 40 MHz can be interchangeably expressed as BW40 or BW40M, a bandwidth of 80 MHz can be interchangeably expressed as BW80 or BW80M, a bandwidth of 160 MHz can be interchangeably expressed as BW160 or BW160M, a bandwidth of 240 MHz can be interchangeably expressed as BW240 or BW240M, a bandwidth of 320 MHz can be interchangeably expressed as BW320 or BW320M, a bandwidth of 480 MHz can be interchangeably expressed as BW480 or BW480M, and a bandwidth of 640 MHz can be interchangeably expressed as BW640 or BW640M.

[0031] Figure 1 An example network environment 100 is shown in which various solutions and approaches according to the present invention may be implemented. Figure 2 to Figure 14 FIG. 1 shows an exemplary implementation of various proposed solutions in a network environment 100 according to the present invention. Figures 1 to 14 , the following description of various proposed schemes is provided.

[0032] See also Figure 1 , the network environment 100 may involve at least a STA (station) 110 and a STA 120 for wireless communication. Either of the STA 110 and the STA 120 may be used as an AP (access point) STA, or alternatively, as a non-AP STA. In some cases, the STA 110 and the STA 120 may be associated with a BSS (basic service set) according to one or more IEEE 802.11 standards (e.g., IEEE 802.11be and / or future standards). Each of the STA 110 and the STA 120 may be configured to communicate with each other by utilizing a 4x LTF sequence design for wide bandwidth in wireless communication according to various proposed schemes described below. That is, either or both of the STA 110 and the STA 120 may act as a "user" in the proposed schemes and examples described below. It is noteworthy that although various proposed schemes may be described separately or separately below, in actual implementations, some or all of the proposed schemes may be utilized or otherwise implemented in combination. Of course, each of the proposed solutions may be utilized or implemented in other ways individually or separately.

[0033] Figure 2 An example scenario 200 is shown according to an embodiment of the present invention. Scenario 200 may involve RU / MRU for BW240, BW480, and BW640 considered in LTF PAPR evaluation. Figure 2 Part (A) of FIG. 2 shows a list of RU / MUR types (expressed as the number of tones in a given RU / MRU) and the corresponding number of RU / MRUs that can be sent in BW 240 . Figure 2 Part (B) of FIG. 4 shows a list of RU / MUR types (expressed as the number of tones in a given RU / MRU) and the corresponding number of RU / MRUs that can be sent in BW 480 . Figure 2 Part (C) of FIG. 6 shows a list of RU / MUR types (expressed as the number of tones in a given RU / MRU) and the corresponding number of RU / MRUs that can be sent in BW 640 .

[0034] Under the proposed scheme according to the present invention, there may be multiple options for the design of 4x UHR (ultra-high reliability) LTF (UHR-LTF for short) for wide bandwidths (e.g., BW240, BW480, and BW640). In the first option (option 1), the 80MHz bandwidth sub-block basic sequence and optimized coefficients under IEEE 802.11be may be used to construct LTF sequences of 240MHz, 480MHz, and 640MHz wide bandwidths for the next generation of WiFi. In the second option (option 2), the 160MHz bandwidth EHT (extremely-high throughput) LTF (EHT-LTF for short) sequence under IEEE 802.11be may be used to construct LTF sequences of 480MHz and 640MHz wide bandwidths for the next generation of WiFi. In addition, the 160MHz bandwidth EHT-LTF sequence and the 80MHz bandwidth EHT-LTF sequence under IEEE 802.11be can be used to construct an LTF sequence for a 240MHz wide bandwidth. In the third option (option 3), the sub-block basic sequence and optimization coefficient for 80MHz bandwidth under IEEE 802.11ax can be used to construct LTF sequences of 240MHz, 480MHz and 640MHz wide bandwidths for the next generation of WiFi. In the fourth option (option 4), the 160MHz bandwidth HE high-efficiency (HE)-LTF sequence under IEEE802.11ax can be used to construct LTF sequences of 480MHz and 640MHz wide bandwidths for the next generation of WiFi. In addition, the 160MHz bandwidth HE-LTF sequence and the 80MHz bandwidth HE-LTF sequence under IEEE 802.11ax can be used to construct an LTF sequence for a 240MHz wide bandwidth. In the present invention, the term "4x" refers to the tone frequency in the LTF being four times that of the traditional LTF. In other words, the subcarrier spacing in the 4x LTF sequence under the proposed scheme may be 78.125 kHz (as opposed to 312.5 kHz for the conventional LTF).

[0035] Therefore, in each of Option 1, Option 2, Option 3, and Option 4, a predefined LTF base sequence (e.g., the IEEE 802.11be 80MHz sub-block base sequence for LTF in Option 1, the IEEE802.11be 160MHz EHT-LTF sequence and the IEEE 802.11be 80MHz EHT-LTF sequence in Option 2, the IEEE802.11ax 80MHz sub-block base sequence in Option 3, and the IEEE 802.11ax 160MHz HE-LTF sequence and the IEEE802.11ax 80MHz HE-LTF sequence in Option 4) may be used to generate or otherwise construct a 4x UHR-LTF sequence for a physical-layer protocol data unit (PPDU) for wireless communication over the wide bandwidth of BW240. Figure 3A and Figure 3B An example design 300 under the proposed scheme is shown. Specifically, Figure 3A The left half of the predefined LTF base sequence used in Option 1 is marked. Figure 3B The right half of the predefined LTF base sequence used in Option 1 is marked. Figure 3A and Figure 3B , the predefined LTF base sequence used in Option 1 may be the IEEE 802.11be 80 MHz sub-block base sequence for LTF. The left half of the IEEE 802.11be 80 MHz sub-block base sequence for LTF with 78.125 kHz subcarrier spacing is interchangeably denoted herein as "LTF 80MHz_subblock_left_4x ", and IEEE for LTF with 78.125kHz subcarrier spacing

[0036] The right half of the 802.11be 80 MHz sub-block base sequence is interchangeably referred to herein as "LTF 80MHz_subblock_right_4x ”.

[0037] Figure 4 An example design 400 according to an embodiment of the present invention is shown. Under the proposed scheme, the 4x UHR-LTF sequence for BW240 under Option 1 (interchangeably denoted herein as "UHR-LTF240M_4x") can be represented as: UHR-LTF240M_4x = [c(1)*

[0038] LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)*

[0039] LTF80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)*

[0040] LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x Here, the vector of the optimized coefficient combination C = [c(1)c(2)c(3)c(4)c(5)c(6)] = [-1 -1-1 1 1 1], where "05" means five consecutive zeros, and "0 23 " indicates 23 consecutive zeros. The optimization coefficients are selected to achieve minimum PAPR for LTF and data tones using 4x UHR-LTF sequences for all RU and MRU types / sizes in BW240 under the proposed scheme.

[0041] Figure 5 An example scenario 500 under the proposed scheme is shown. The scenario 500 may involve the PAPR of the BW 240 using a 4x UHR-LTF sequence under the proposed scheme. Figure 5 The rightmost column in the table in FIG. 1 shows the spatial streams (N) ranging from 1 to 8 for various combinations of dRU / MRU types and various RU / MRU sizes. SS ) is the worst PAPR (in dB) of the number of UHR-LTFs. Figure 6 An example scenario 600 for the proposed solution is shown. The scenario 600 may involve PAPR ( LTF and data tones) for all RU and MRU types / sizes in BW 240. Figure 6 (A) of the Figure 2) and the worst-case PAPR of LTF and data tones on the MRU (2x996) in BW240 ( Figure 6 (B) of the Figure 6 In each of the graphs shown in parts (A) and (B) of , the curve on the left relates to the PAPR of the LTF tone in dB, while the curve on the right relates to the PAPR of the data tone modulated using binary phase-shift keying (BPSK) in dB.

[0042] Figure 7 An example design 700 according to an embodiment of the present invention is shown. Under the proposed scheme, the 4x UHR-LTF sequence for BW480 under Option 1 (interchangeably denoted herein as "UHR-LTF480M_4x") can be represented as: UHR-LTF480M_4x = [c(1)*

[0043] LTF 80MHz_subblock_left_4x,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)*

[0044] LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)*

[0045] LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ,0 23 ,c(7)*

[0046] LTF 80MHz_subblock_left_4x ,05,c(8)*LTF 80MHz_subblock_right_4x ,0 23 ,c(9)*

[0047] LTF 80MHz_subblock_left_4x ,05,c(10)*LTF 80MHz_subblock_right_4x ,0 23 ,c(11)*

[0048] LTF 80MHz_subblock_left_4x ,05,c(12)*LTF 80MHz_subblock_right_4x Here, the optimized coefficient combination vector C = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10)c(11)c(12)] = [-1 -1-1 11-11-1-1 1-1-1], where "05" means five consecutive zeros, and "0 23 " indicates 23 consecutive zeros. The optimization coefficients are selected to achieve minimum PAPR for LTF and data tones using 4x UHR-LTF sequences for all RU and MRU types / sizes in BW480 under the proposed scheme.

[0049] Figure 8 An example scenario 800 under the proposed scheme is shown. The scenario 800 may involve a PAPR of BW480 using a 4x UHR-LTF sequence under the proposed scheme. Figure 8 The rightmost column of the table in shows N ranging from 1 to 8 for various combinations of dRU / MRU types and various RU / MRU sizes. SS The worst PAPR (in dB) of the UHR-LTF. Fig. 9 An example scenario 900 for the proposed solution is shown. The scenario 900 may involve PAPR ( LTF and data tones) for all RU and MRU types / sizes in BW480. Fig. 9(A) of the Figure 1) and the worst-case PAPR of LTF and data tones on the MRU (2x996+484) in BW480 ( Fig. 9 (B) of the Fig. 9 In each of the graphs shown in parts (A) and (B) of , the curve on the left relates to the PAPR of the LTF tone, while the curve on the right relates to the PAPR of the data tone modulated using binary phase shift keying (BPSK).

[0050] Fig.10 An example design 1000 according to an embodiment of the present invention is shown. Under the proposed scheme, the 4x UHR-LTF sequence for BW640 under Option 1 (interchangeably denoted herein as "UHR-LTF640M_4x") can be represented as: UHR-LTF640M_4x = [c(1)*

[0051] LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)*

[0052] LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)*

[0053] LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ,0 23 ,c(7)*

[0054] LTF 80MHz_subblock_left_4x ,05,c(8)*LTF 80MHz_subblock_right_4x ,0 23 ,c(9)*

[0055] LTF 80MHz_subblock_left_4x ,05,c(10)*LTF 80MHz_subblock_right_4x ,0 23 ,c(11)*

[0056] LTF 80MHz_subblock_left_4x ,05,c(12)*LTF 80MHz_subblock_right_4x ,0 23 ,c(13)*

[0057] LTF 80MHz_subblock_left_4x ,05,c(14)*LTF 80MHz_subblock_right_4x ,0 23 ,c(15)*

[0058] LTF 80MHz_subblock_left_4x ,05,c(16)*LTF 80MHz_subblock_right_4xHere, the combination of optimization coefficients

[0059] The vector C = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10)c(11)c(12)c(13)c(14)c(15)c(16)] = [-1 -1-1 1 1 1 -1-1 -1 1 -1 1 -1 1], where "05" represents 5 consecutive zeros and "023" represents 23 consecutive zeros. The optimization coefficients are selected to achieve the minimum PAPR for LTF and data tones using 4x UHR-LTF sequences for all RU and MRU types / sizes in BW640 under the proposed scheme.

[0060] Fig.11 An example scenario 1100 under the proposed scheme is shown. The scenario 1100 may involve the PAPR of BW 640 using 4x UHR-LTF sequences under the proposed scheme. Fig.11 The rightmost column of the table in shows N ranging from 1 to 8 for various combinations of dRU / MRU types and various RU / MRU sizes. SS The worst PAPR (in dB) of the UHR-LTF. Fig.12 An example scenario 1200 for the proposed solution is shown. The scenario 1200 may involve PAPR ( LTF and data tones) for all RU and MRU types / sizes in BW 640. Fig.12 ) and the worst-case PAPR for LTF and data tones on the MRU (4x996) in the BW640 ( Fig.12 on the right side of the ).

[0061] Illustrative Embodiments

[0062] Fig.13 An example system 1300 having at least an example device 1310 and an example device 1320 according to an embodiment of the present invention is shown. Each of the devices 1310 and 1320 can perform various functions to implement the schemes, techniques, processes and methods described herein related to 4x LTF sequence design for wide bandwidth in wireless communication, including the descriptions of various proposed designs, concepts, systems and methods above and the processes described below. For example, the device 1310 can be an example implementation of the communication entity 110, and the device 1320 can be an example implementation of the communication entity 120.

[0063] Each of the devices 1310 and 1320 may be part of an electronic device, which may be a STA or AP, such as a portable or mobile device, a wearable device, a wireless communication device, or a computing device. For example, each of the devices 1310 and 1320 may be implemented in a smart phone, a smart watch, a personal digital assistant, a digital camera, or a computing device such as a tablet computer, a laptop computer, or a notebook computer. Each of the devices 1310 and 1320 may also be part of a machine type device, which may be an IoT device, such as a stationary or fixed device, a home device, a wired communication device, or a computing device. For example, each of the devices 1310 and 1320 may be implemented in a smart thermostat, a smart refrigerator, a smart door lock, a wireless speaker, or a home control center. When implemented in a network device or as a network device, the device 1310 and / or the device 1320 may be implemented in a network node, such as an AP in a WLAN.

[0064] In some embodiments, each of the devices 1310 and 1320 may be implemented in the form of one or more integrated-circuit (IC) chips, such as, but not limited to, one or more single-core processors, one or more multi-core processors, one or more reduced-instruction set computing (RISC) processors, or one or more complex-instruction-set computing (CISC) processors. In the above various schemes, each of the devices 1310 and 1320 may be implemented in a STA or an AP or as a STA or an AP. Each of the devices 1310 and 1320 may include Fig.13 At least some of those components shown in, for example, Fig.13 1310 and 1320. Each of the apparatuses 1310 and 1320 may also include one or more other components (e.g., an internal power supply, a display device, and / or a user interface device) that are not related to the solution proposed by the present invention, and therefore, for the sake of simplicity and brevity, such components of the apparatuses 1310 and 1320 are not shown in FIG. Fig.13 is not shown in the figure and is not described below.

[0065] In one aspect, each of processors 1312 and processor 1322 may be implemented in the form of one or more single-core processors, one or more multi-core processors, one or more RISC processors, or one or more CISCs. That is, although the singular term "processor" is used herein to refer to processors 1312 and processor 1322, each of processors 1312 and processor 1322 may include multiple processors in some embodiments and may include a single processor in other embodiments according to the present invention. On the other hand, each of processors 1312 and processor 1322 may be implemented in the form of hardware (and optionally, firmware) having electronic components, including, for example but not limited to, one or more transistors, one or more diodes, one or more capacitors, one or more resistors, one or more inductors, one or more memristors, and / or one or more varactor diodes, which are configured and arranged to achieve specific purposes according to the present invention. In other words, in at least some embodiments, each of processors 1312 and processor 1322 is a special-purpose machine that is specially designed, arranged, and configured to perform specific tasks, including tasks related to the design of 4x LTF sequences for wide bandwidth in wireless communications based on multiple embodiments of the present invention. For example, each of processors 1312 and processor 1322 may be configured with hardware components or circuits implementing one, some, or all of the examples described and illustrated herein.

[0066] In some embodiments, the device 1310 may also include a transceiver 1316 coupled to the processor 1312. The transceiver 1316 may be capable of wirelessly transmitting and receiving data. In some embodiments, the device 1320 may also include a transceiver 1326 coupled to the processor 1322. The transceiver 1326 may include a transceiver capable of wirelessly transmitting and receiving data.

[0067] In some embodiments, the device 1310 may further include a memory 1314 coupled to the processor 1312 and accessible by the processor 1312 and storing data therein. In some embodiments, the device 1320 may further include a memory 1324 coupled to the processor 1322 and accessible by the processor 1322 and storing data therein. Each of the memory 1314 and the memory 1324 may include a type of random-access memory (RAM), such as dynamic RAM (DRAM), static RAM (SRAM), thyristor RAM (T-RAM) and / or zero-capacitor RAM (Z-RAM). Alternatively or additionally, each of the memory 1314 and the memory 1324 may include a type of read-only memory (ROM), such as a mask ROM, a programmable ROM (PROM), an erasable programmable ROM (EPROM), and / or an electrically erasable programmable ROM (EEPROM). Alternatively or additionally, each of the memory 1314 and the memory 1324 may include a type of non-volatile random-access memory (NVRAM), such as a flash memory, a solid-state memory, a ferroelectric RAM (FeRAM), a magnetoresistive RAM (MRAM), and / or a phase change memory.

[0068] Each of the devices 1310 and 1320 may be communication entities capable of communicating with each other using various proposed schemes according to the present invention. For illustrative purposes and not limitation, a description of the capabilities of the device 1310 as the communication entity 110 and the device 1320 as the communication entity 120 is provided below in the example process 1400. It is worth noting that although the example implementation described below is provided in the environment of a WLAN, it may also be implemented in other types of networks. Therefore, although the following description of the example implementation relates to a scenario in which the device 1310 acts as a transmitting device and the device 1320 acts as a receiving device, this is also applicable to another scenario in which the device 1310 acts as a receiving device and the device 1320 acts as a transmitting device.

[0069] Illustrative Process

[0070] Fig.14 An example process 1400 according to an embodiment of the present invention is shown. Process 1400 can represent aspects of implementing the various proposed designs, concepts, schemes, systems and methods described above. More specifically, process 1400 can represent aspects of the proposed concepts and schemes related to 4x LTF sequence design for wide bandwidth in wireless communications based on the present invention. Process 1400 may include one or more operations, actions, or functions as shown in one or more of blocks 1410 and 1420. Although shown as discrete blocks, the various blocks of process 1400 may be divided into additional blocks, combined into fewer blocks, or eliminated, depending on the desired implementation. In addition, the / sub-blocks of process 1400 may be arranged in Fig.14 , or, in a different order. In addition, one or more blocks / subblocks of process 1400 may be performed repeatedly or repeatedly. Process 1400 may be implemented by device 1310 and device 1320 and any variants thereof or implemented in device 1310 and device 1320. For illustrative purposes only and without limiting the scope, process 1400 is described below in an environment where device 1310 is a communication entity 110 (e.g., a transmitting device, STA or AP) of a wireless network and device 1320 is a communication entity 120 (e.g., a receiving device, STA or AP) of a wireless network, wherein the wireless network may be, for example, a WLAN according to one or more IEEE 802.11 standards. Process 1400 may start at block 1410.

[0071] At 1410 , process 1400 may involve processor 1312 of device 1310 generating LTFs of the PPDU having a 78.125 kHz subcarrier spacing by using a predefined LTF base sequence. Process 1400 may proceed from 1410 to 1420 .

[0072] At 1420 , process 1400 may involve processor 1312 performing wireless communications (eg, with device 1320 ) via transceiver 1316 utilizing a PPDU in a 240 MHz, 480 MHz, or 640 MHz bandwidth.

[0073] In some embodiments (option 1), when generating the LTF, process 1400 may involve processor 1312 using an IEEE 802.11be 80 MHz sub-block base sequence to generate the LTF of the PPDU such that the LTF is used for wireless communication in 240 MHz, 480 MHz, or 640 MHz bandwidth.

[0074] In addition, under Option 1, when generating the LTF, the process 1400 may also involve the processor 1312 generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 240 MHz, specifically: (i) LTF = [c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*

[0075] LTF 80MHz_subblock_right_4x ,0 23 ,c(3)*LTF 80MHz_subblock_left_4x ,05,c(4)*

[0076] LTF 80MHz_subblock_right_4x ,0 23 ,c(5)*LTF 80MHz_subblock_left_4x ,05,c(6)*

[0077] LTF 80MHz_subblock_right_4x ], (ii) optimized coefficient combination = [c(1)c(2)c(3)c(4)c(5)c(6)] = [-1 -1-1 1 1 1], (iii) LTF 80MHz_subblock_left_4x represents the left half of the IEEE802.11be 80MHz sub-block basic sequence with a subcarrier spacing of 78.125kHz, (iv) LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block basic sequence with a subcarrier spacing of 78.125 kHz, (v) 05 represents five consecutive zeros, (vi) 0 23 Represents 23 consecutive zeros.

[0078] Alternatively, under Option 1, when generating the LTF, the process 1400 may further involve the processor 1312 generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 480 MHz. Specifically: (i) LTF = [c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*

[0079] LTF 80MHz_subblock_right_4x ,0 23 ,c(3)*LTF 80MHz_subblock_left_4x ,05,c(4)*

[0080] LTF 80MHz_subblock_right_4x ,0 23 ,c(5)*LTF 80MHz_subblock_left_4x ,05,c(6)*

[0081] LTF 80MHz_subblock_right_4x ,0 23 ,c(7)*LTF 80MHz_subblock_left_4x ,05,c(8)*

[0082] LTF 80MHz_subblock_right_4x ,0 23 ,c(9)*LTF 80MHz_subblock_left_4x ,05,c(10)*

[0083] LTF 80MHz_subblock_right_4x ,0 23 ,c(11)*LTF 80MHz_subblock_left_4x ,05,c(12)*

[0084] LTF 80MHz_subblock_right_4x ], (ii) the optimized combination of coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10)c(11))c(12)] = [-1 -1 -1 1 1 -1 -1 -1 1 -1 -1], (iii)

[0085] LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a subcarrier spacing of 78.125 kHz, (iv) LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block basic sequence with a subcarrier spacing of 78.125 kHz, (v) 05 represents five consecutive zeros, (vi) 0 23 Represents 23 consecutive zeros.

[0086] Alternatively, under Option 1, when generating the LTF, the process 1400 may further involve the processor 1312 generating the LTF of the PPDU using a combination of optimized coefficients, so that the LTF is used for wireless communication with a bandwidth of 640 MHz. Specifically: (i) LTF = [c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*

[0087] LTF 80MHz_subblock_right_4x ,0 23 ,c(3)*LTF 80MHz_subblock_left_4x ,05,c(4)*

[0088] LTF 80MHz_subblock_right_4x ,0 23 ,c(5)*LTF 80MHz_subblock_left_4x ,05,c(6)*

[0089] LTF 80MHz_subblock_right_4x ,0 23 ,c(7)*LTF 80MHz_subblock_left_4x ,05,c(8)*

[0090] LTF 80MHz_subblock_right_4x ,023 ,c(9)*LTF 80MHz_subblock_left_4x ,05,c(10)*

[0091] LTF 80MHz_subblock_right_4x ,0 23 ,c(11)*LTF 80MHz_subblock_left_4x ,05,c(12)*

[0092] LTF 80MHz_subblock_right_4x ,0 23 ,c(13)*LTF 80MHz_subblock_left_4x ,05,c(14)*

[0093] LTF 80MHz_subblock_right_4x ,0 23 ,c(15)*LTF 80MHz_subblock_left_4x ,05,c(16)*

[0094] LTF 80MHz_subblock_right_4x ], (ii) optimized coefficient combination = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10)c(11))c(12)c(13)c(14)c(15)c(16)] = [-1 -1 -1 1 1 1 -1 -1 -11 -1 1 1-1 1], (iii) LTF 80MHz_subblock_left_4x represents the left half of the IEEE802.11be 80MHz sub-block basic sequence with a subcarrier spacing of 78.125kHz, (iv) LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block basic sequence with a subcarrier spacing of 78.125 kHz, (v) 05 represents five consecutive zeros, (vi) 0 23 Represents 23 consecutive zeros.

[0095] In some implementations (option 2), when generating the LTF, the process 1400 may involve the processor 1312 generating the LTF of the PPDU using an IEEE 802.11be 160 MHz Extremely High Throughput (EHT)-LTF sequence so that the LTF is used for wireless communication in a 480 MHz or 640 MHz bandwidth.

[0096] In some implementations (option 2), when generating the LTF, the process 1400 may involve the processor 1312 generating the LTF of the PPDU using the IEEE 802.11be 160MHz EHT-LTF sequence and the IEEE 802.11be 80MHz EHT-LTF sequence so that the LTF is used for wireless communication with a 240MHz bandwidth.

[0097] In some implementations (option 3), when generating the LTF, process 1400 may involve processor 1312 generating the LTF of the PPDU using an IEEE 802.11ax 80 MHz sub-block base sequence such that the LTF is used for wireless communication in a 240 MHz, 480 MHz, or 640 MHz bandwidth.

[0098] In some embodiments (option 4), when generating the LTF, process 1400 may involve processor 1312 generating the LTF of the PPDU using an IEEE 802.11ax 160 MHz HE-LTF sequence so that the LTF is used for wireless communication in a 480 MHz or 640 MHz bandwidth.

[0099] In some embodiments (option 4), when generating the LTF, the process 1400 may involve the processor 1312 using the IEEE 802.11ax 160MHz HE-LTF sequence and the IEEE 802.11ax 80MHz HE-LTF sequence to generate the LTF of the PPDU, so that the LTF is used for wireless communication with a bandwidth of 240MHz.

[0100] Additional Notes

[0101] The subject matter described herein sometimes shows different components contained in or connected to other different components.It should be understood that the architecture depicted in this way is only an example, and many other architectures can actually be implemented to achieve the same function.In a conceptual sense, any component arrangement that achieves the same function is effectively "associated" so that the desired function is achieved.Therefore, any two components combined here to achieve a specific function can be regarded as "associated" with each other so that the desired function is achieved, regardless of the architecture or intermediate components.Similarly, any two components so associated can also be regarded as "operably connected" or "operably coupled" to each other to achieve the desired function, and any two components that can be so associated can also be regarded as "operably coupled" to each other to achieve the desired function.Specific examples of operable coupling include but are not limited to physically pairable and / or physically interacting components and / or wirelessly interactive and / or wirelessly interactive components and / or logically interacting and / or logically interactive components.

[0102] In addition, with respect to the use of substantially any plural and / or singular terms herein, those skilled in the art may translate from the plural to the singular and / or from the singular to the plural, depending on the context and / or application. For clarity, various singular / plural permutations may be expressly set forth herein.

[0103] In addition, it will be understood by those skilled in the art that the terms used herein in general, and particularly in the appended claims, such as the bodies of the appended claims, are generally intended to be "open" terms, such as the term "including" should be interpreted as "including but not limited to", the term "comprising" should be interpreted as "including but not limited to", the term "having" should be interpreted as "having at least", etc. It will be further understood by those skilled in the art that if a specific number of an introduced claim element is intended, such an intent will be explicitly stated in the claim, and in the absence of such a statement, such an intent is absent. For example, to aid understanding, the appended claims may contain the use of the introductory phrases "at least one" and "one or more" to introduce claim elements. However, the use of such phrases should not be interpreted as implying that a claim element introduced by the indefinite article "a" or "an" limits any particular claim containing such introduced claim element to only include one such element, for example, "a" and / or "an" should be interpreted as meaning "at least one" or "one or more", and the same applies to the use of definite articles used to introduce claim elements. Furthermore, even if a specific number of an introduced claim element is explicitly recited, one skilled in the art will recognize that such a statement should be interpreted to mean at least the recited number, e.g., the recitation "two elements" without other modifiers means at least two elements or two or more elements. Furthermore, where similar "at least one of A, B, and C, etc." is used, for purposes thereof, generally such a construction will be understood by one skilled in the art to be of such convention, e.g., "a system having at least one of A, B, and C" will include, but is not limited to, a system having A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. Where similar "at least one of A, B, or C, etc." is used, for purposes thereof, generally such a construction will be understood by one skilled in the art to be of such convention, e.g., "a system having at least one of A, B, or C" will include, but is not limited to, a system having A alone, B alone, C alone, A and B together, A and C together, B and C together, and / or A, B, and C together, etc. Those skilled in the art will further understand that any transitional words and / or phrases that actually represent two or more alternatives, whether in the specification, claims or drawings, should be understood to include the possibility of one of the multiple terms, any of the multiple terms, or both terms. For example, the phrase "A or B" will be understood to include the possibility of "A" or "B" or "A and B".

[0104] As can be seen from the above, it can be understood that various embodiments of the present application have been described herein for illustrative purposes, and various modifications can be made without departing from the scope and spirit of the present application. Therefore, the various embodiments disclosed herein are not meant to be restrictive, and the true scope and spirit are determined by the appended claims.

Claims

1. A method comprising: Generate a long training field (LTF) of a physical layer protocol data unit (PPDU) with a subcarrier spacing of 78.125 kHz using a predefined LTF basic sequence; as well as The PPDU is used to perform wireless communication in a 240 MHz, 480 MHz or 640 MHz bandwidth.

2. The method according to claim 1, wherein: Generating the LTF includes: generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11be 80 MHz sub-block base sequence, so that the LTF is used for wireless communication with a bandwidth of 240 MHz, 480 MHz, or 640 MHz.

3. The method according to claim 2, wherein: Generating the LTF further includes: generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 240 MHz, wherein: LTF=[c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)* LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)* LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ], The combination of the optimized coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)] = [-1-1-1 1 1 1], LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, 05 means five consecutive zeros, and 0 23 Represents 23 consecutive zeros.

4. The method according to claim 2, wherein: Generating the LTF further includes: generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 480 MHz, and wherein: LTF=[c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)* LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)* LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ,0 23 ,c(7)* LTF 80MHz_subblock_left_4x ,05,c(8)*LTF 80MHz_subblock_right_4x ,0 23 ,c(9)* LTF 80MHz_subblock_left_4x ,05,c(10)*LTF 80MHz_subblock_right_4x ,0 23 ,c(11)* LTF 80MHz_subblock_left_4x ,05,c(12)*LTF 80MHz_subblock_right_4x ], The combination of the optimized coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10) c(11))c(12)]=[-1-1-1 1 1-1 1-1-1 1-1-1], LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, LTF 80MHz_subblock_right_4x Represents IEEE 802.11be with 78.125kHz subcarrier spacing The right half of the 80MHz sub-block basic sequence, 05 means five consecutive zeros, and 0 23 Represents 23 consecutive zeros.

5. The method according to claim 2, wherein: Generating the LTF further includes: generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 640 MHz, wherein: LTF=[c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3) *LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)* LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ,0 23 ,c(7)* LTF 80MHz_subblock_left_4x ,05,c(8)*LTF 80MHz_subblock_right_4x ,0 23 ,c(9)* LTF 80MHz_subblock_left_4x ,05,c(10)*LTF 80MHz_subblock_right_4x ,0 23 ,c(11)* LTF 80MHz_subblock_left_4x ,05,c(12)*LTF 80MHz_subblock_right_4x ,0 23 ,c(13)* LTF 80MHz_subblock_left_4x ,05,c(14)*LTF 80MHz_subblock_right_4x ,0 23 ,c(15)* LTF 80MHz_subblock_left_4x ,05,c(16)*LTF 80MHz_subblock_right_4x ], The combination of the optimized coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10) c(11))c(12)c(13)c(14)c(15)c(16)]=[-1-1-1 1 1 1 1-1-1-1 1-1 1 1-1 1], LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, 05 means five consecutive zeros, and 0 23 Represents 23 consecutive zeros.

6. The method according to claim 1, wherein: Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11be 160 MHz Extremely High Throughput (EHT)-LTF sequence, so that the LTF is used for wireless communication at a bandwidth of 480 MHz or 640 MHz.

7. The method according to claim 1, wherein: Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11be 160MHz Extremely High Throughput (EHT)-LTF sequence and an IEEE 802.11be 80MHz EHT-LTF sequence, so that the LTF is used for wireless communication with a bandwidth of 240MHz.

8. The method according to claim 1, wherein: Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11ax 80 MHz sub-block base sequence, so that the LTF is used for the wireless communication with a bandwidth of 240 MHz, 480 MHz, or 640 MHz.

9. The method according to claim 1, wherein: Generating the LTF includes: generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11ax 160 MHz High Efficiency (HE)-LTF sequence, so that the LTF is used for wireless communication with a bandwidth of 480 MHz or 640 MHz.

10. The method according to claim 1, wherein: Generating the LTF includes: using an Institute of Electrical and Electronics Engineers (IEEE) 802.11ax 160MHz High Efficiency (HE)-LTF sequence and an IEEE 802.11ax 80MHz HE-LTF sequence to generate the LTF of the PPDU, so that the LTF is used for wireless communication with a bandwidth of 240MHz.

11. A communication device, comprising: a transceiver configured for wireless transmission and reception; as well as A processor coupled to the transceiver and configured to perform operations including: Generate a long training field (LTF) of a physical layer protocol data unit (PPDU) with a subcarrier spacing of 78.125 kHz using a predefined LTF basic sequence; as well as The PPDU is used via the transceiver for wireless communication in a 240 MHz, 480 MHz, or 640 MHz bandwidth.

12. The device according to claim 11, wherein Generating the LTF includes: generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11be 80 MHz sub-block base sequence, so that the LTF is used for wireless communication with a bandwidth of 240 MHz, 480 MHz, or 640 MHz.

13. The device according to claim 12, wherein: Generating the LTF further includes: generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 240 MHz, wherein: LTF=[c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)* LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)* LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ], The combination of the optimized coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)] = [-1-1-1 1 1 1], LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, 05 means five consecutive zeros, and 0 23 Represents 23 consecutive zeros.

14. The device according to claim 12, wherein: Generating the LTF further includes: generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 480 MHz, and wherein: LTF=[c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3)* LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)* LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ,0 23 ,c(7)* LTF 80MHz_subblock_left_4x ,05,c(8)*LTF 80MHz_subblock_right_4x ,0 23 ,c(9)* LTF 80MHz_subblock_left_4x ,05,c(10)*LTF 80MHz_subblock_right_4x ,0 23 ,c(11)* LTF 80MHz_subblock_left_4x ,05,c(12)*LTF 80MHz_subblock_right_4x ], The combination of the optimized coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10) c(11))c(12)]=[-1-1-1 1 1-1 1-1-1 1-1-1], LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, LTF 80MHz_subblock_right_4x Represents IEEE 802.11be with 78.125kHz subcarrier spacing The right half of the 80MHz sub-block basic sequence, 05 means five consecutive zeros, and 0 23 Represents 23 consecutive zeros.

15. The device according to claim 12, wherein: Generating the LTF further includes: generating the LTF of the PPDU using a combination of optimized coefficients so that the LTF is used for wireless communication with a bandwidth of 640 MHz, wherein: LTF=[c(1)*LTF 80MHz_subblock_left_4x ,05,c(2)*LTF 80MHz_subblock_right_4x ,0 23 ,c(3) *LTF 80MHz_subblock_left_4x ,05,c(4)*LTF 80MHz_subblock_right_4x ,0 23 ,c(5)* LTF 80MHz_subblock_left_4x ,05,c(6)*LTF 80MHz_subblock_right_4x ,0 23 ,c(7)* LTF 80MHz_subblock_left_4x ,05,c(8)*LTF 80MHz_subblock_right_4x ,0 23 ,c(9)* LTF 80MHz_subblock_left_4x ,05,c(10)*LTF 80MHz_subblock_right_4x ,0 23 ,c(11)*LTF 80MHz_subblock_left_4x ,05,c(12)*LTF 80MHz_subblock_right_4x ,0 23 ,c(13)* LTF 80MHz_subblock_left_4x ,05,c(14)*LTF 80MHz_subblock_right_4x ,0 23 ,c(15)* LTF 80MHz_subblock_left_4x ,05,c(16)*LTF 80MHz_subblock_right_4x ], The combination of the optimized coefficients = [c(1)c(2)c(3)c(4)c(5)c(6)c(7)c(8)c(9)c(10) c(11))c(12)c(13)c(14)c(15)c(16)]=[-1-1-1 1 1 1 1-1-1-1 1-1 1 1-1 1], LTF 80MHz_subblock_left_4x represents the left half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, LTF 80MHz_subblock_right_4x represents the right half of the IEEE 802.11be 80 MHz sub-block base sequence with a sub-carrier spacing of 78.125 kHz, 05 means five consecutive zeros, and 0 23 Represents 23 consecutive zeros.

16. The device according to claim 11, wherein Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11be 160 MHz Extremely High Throughput (EHT)-LTF sequence, so that the LTF is used for wireless communication at a bandwidth of 480 MHz or 640 MHz.

17. The device according to claim 11, wherein: Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11be 160MHz Extremely High Throughput (EHT)-LTF sequence and an IEEE 802.11be 80MHz EHT-LTF sequence, so that the LTF is used for wireless communication with a bandwidth of 240MHz.

18. The device according to claim 11, wherein Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11ax 80 MHz sub-block base sequence, so that the LTF is used for the wireless communication with a bandwidth of 240 MHz, 480 MHz, or 640 MHz.

19. The device according to claim 11, wherein: Generating the LTF includes: generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11ax 160 MHz High Efficiency (HE)-LTF sequence, so that the LTF is used for wireless communication with a bandwidth of 480 MHz or 640 MHz.

20. The device according to claim 11, wherein Generating the LTF includes generating the LTF of the PPDU using an Institute of Electrical and Electronics Engineers (IEEE) 802.11ax 160MHz High Efficiency (HE)-LTF sequence and an IEEE 802.11ax 80MHz HE-LTF sequence, so that the LTF is used for wireless communication with a bandwidth of 240MHz.

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