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EP-4742602-A1 - COMMUNICATION METHOD AND COMMUNICATION APPARATUS

EP4742602A1EP 4742602 A1EP4742602 A1EP 4742602A1EP-4742602-A1

Abstract

This application provides a communication method and apparatus. The method may be applied to a WLAN system supporting 802.11 series protocols such as a next-generation Wi-Fi protocol of IEEE 802.11ax like 802.11be, Wi-Fi 7, or EHT, and a next-generation protocol of 802.11be like Wi-Fi 8, and may also be applied to a UWB-based wireless personal area network system, a sensing system, and the like. The method includes: A transmit end generates a physical layer protocol data unit PPDU, and sends the PPDU to a receive end. The PPDU includes a first field, the first field is used to carry a first sequence, the first sequence is used by the receive end to perform channel estimation, the first sequence corresponds to a first bandwidth, and the first bandwidth is greater than 320 MHz. In the solutions of this application, a channel estimation sequence corresponding to a bandwidth greater than 320 MHz is designed, to support signal transmission in a large-bandwidth (for example, 640 MHz or 480 MHz) scenario.

Inventors

  • LIU, Chenchen
  • MAO, Zhi
  • GAN, Ming

Assignees

  • Huawei Technologies Co., Ltd.

Dates

Publication Date
20260513
Application Date
20240719

Claims (14)

  1. A communication method, applied to a transmit end, wherein the method comprises: generating a physical layer protocol data unit PPDU, wherein the PPDU comprises a first field, the first field is used to carry a first sequence, the first sequence is used by a receive end to perform channel estimation, the first sequence corresponds to a first bandwidth, and the first bandwidth is greater than 320 MHz; and sending the PPDU to the receive end.
  2. The method according to claim 1, wherein the first sequence comprises N subsequences, and any one of the N subsequences is obtained based on a base sequence and a parameter corresponding to the subsequence.
  3. The method according to claim 2, wherein when the first bandwidth is 640 MHz, parameters [ c 1 , ··· , c 16 ] corresponding to the N subsequences satisfy any one of the following: c 1 ⋯ c 16 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 .
  4. The method according to claim 2, wherein when the first bandwidth is 480 MHz, parameters [ c 1 , ... , c 12 ] corresponding to the N subsequences satisfy any one of the following: c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 ;
  5. A communication method, applied to a receive end and comprising: receiving a physical layer protocol data unit PPDU, wherein the PPDU comprises a first field, the first field carries a first sequence that passes through a wireless channel, the first sequence that passes through the wireless channel corresponds to a first bandwidth, and the first bandwidth is greater than 320 MHz; and performing channel estimation based on the first sequence that passes through the wireless channel and a preset first sequence.
  6. The method according to claim 5, wherein the preset first sequence comprises N subsequences, and any one of the N subsequences is obtained based on a base sequence and a parameter corresponding to the subsequence.
  7. The method according to claim 6, wherein when the first bandwidth is 640 MHz, parameters [ c 1 , ··· , c 14 ] corresponding to the N subsequences satisfy any one of the following: c 1 ⋯ c 16 = ± 1 , − 1 , 1 , 1 , 1 − 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , 1 , − 1 , − 1 − 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 16 = ± 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 16 = ± − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 .
  8. The method according to claim 6, wherein when the first bandwidth is 480 MHz, parameters [c 1 , ... , c 12 ] corresponding to the N subsequences satisfy any one of the following: c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , 1 , 1 , − 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , 1 , − 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± 1 , − 1 , 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 , 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , − 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , − 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , 1 , − 1 , 1 , 1 , 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , − 1 , − 1 , − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 ; or c 1 ⋯ c 12 = ± − 1 , 1 , 1 , − 1 , 1 , − 1 , 1 , 1 , − 1 , − 1 , − 1 , − 1 .
  9. A communication apparatus, comprising a unit or a module configured to perform the method according to any one of claims 1 to 4.
  10. A communication apparatus, comprising a unit or a module configured to perform the method according to any one of claims 5 to 8.
  11. A communication apparatus, comprising a processor, wherein the processor is configured to execute a computer program or instructions stored in a memory, to enable the communication apparatus to perform the method according to any one of claims 1 to 4.
  12. A communication apparatus, comprising a processor, wherein the processor is configured to execute a computer program or instructions stored in a memory, to enable the communication apparatus to perform the method according to any one of claims 5 to 8.
  13. A computer-readable storage medium, wherein the computer-readable storage medium stores a computer program or instructions, and when the computer program or instructions are run on a communication apparatus, the communication apparatus is enabled to perform the method according to any one of claims 1 to 4, or perform the method according to any one of claims 5 to 8.
  14. A computer program product, wherein the computer program product comprises a computer program or instructions for performing the method according to any one of claims 1 to 4, or comprises a computer program or instructions for performing the method according to any one of claims 5 to 8.

Description

This application claims priority to Chinese Patent Application No. 202310952235.X, filed with the China National Intellectual Property Administration on July 29, 2023 and entitled "COMMUNICATION METHOD AND COMMUNICATION APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD Embodiments of this application relate to the communication field, and more specifically, to a communication method and a communication apparatus. BACKGROUND As wireless traffic increases at an ultra-high speed, users have increasingly high requirements on communication quality of service, such as a low latency and ultra-reliability. As a key technology for carrying a wireless traffic service, a wireless local area network (wireless local area network, WLAN) continuously develops and evolves to meet increasingly high requirements of people for wireless transmission. Since the 802.11a/g standard, the WLAN has experienced standard evolution processes such as the 802.11n standard, 802.11ac standard, 802.11ax standard, and 802.11be standard. 802.11be uses an orthogonal frequency division multiple access (orthogonal frequency division multiple access, OFDMA) technology, and supports transmission of a physical layer protocol data unit (physical layer protocol data unit, PPDU) with a maximum bandwidth of 320 MHz, to implement an ultra-high transmission rate and support an ultra-massive user scenario. However, more subcarriers in a large bandwidth bring a higher peak to average power ratio (peak to average power ratio, PAPR), resulting in non-linear distortion of a signal and reducing system performance. SUMMARY This application provides a communication method and a communication apparatus. A channel estimation sequence corresponding to a large bandwidth (a bandwidth greater than 320 MHz, for example, a 640 MHz bandwidth or a 480 MHz bandwidth) is designed, to support large-bandwidth communication. According to a first aspect, a communication method is provided. The method may be performed by a transmit end, or may be performed by a component (for example, a chip, a circuit, or a module) configured in the transmit end. This is not limited in this application. The method includes: generating a physical layer protocol data unit PPDU, where the PPDU includes a first field, the first field is used to carry a first sequence, the first sequence is used by a receive end to perform channel estimation, the first sequence corresponds to a first bandwidth, and the first bandwidth is greater than 320 MHz; and sending the PPDU to the receive end. Optionally, if the first bandwidth is 640 MHz or 480 MHz, the first sequence may be understood as a channel estimation sequence in a 640 MHz PPDU or a 480 MHz PPDU. For example, the transmit end may be an access point (access point, AP) or a non-access point (non-access point, non-AP) station (station, STA). The receive end may be an AP or a STA. This is not limited in this application. For example, in a communication scenario, the transmit end is an AP, and the receive end is a STA; or in a communication scenario, the transmit end is a STA, and the receive end is an AP; or in a communication scenario, the transmit end is a STA, and the receive end is a STA; or in a communication scenario, the transmit end is an AP, and the receive end is an AP. According to the foregoing solution, the first sequence (namely, a long training field (long training field, LTF) sequence) corresponding to the bandwidth greater than 320 MHz is designed, to support signal transmission in a future large-bandwidth (for example, 640 MHz or 480 MHz) scenario. The first sequence has a low PAPR in the entire bandwidth and also has a low PAPR on an RU/MRU. The first sequence also has a low PAPR on a plurality of spatial streams in a multi-spatial-stream transmission scenario. Therefore, system transmission performance can be ensured. With reference to the first aspect, in some implementations of the first aspect, the first sequence includes N subsequences, and any one of the N subsequences is obtained based on a base sequence and a parameter corresponding to the subsequence, for example, is obtained by multiplying the base sequence by the parameter corresponding to the subsequence. The base sequence includes a first base sequence and a second base sequence. For example, the first base sequence is LTF80MHz_4x_left, and the second base sequence is LTF80MHz_4x_right. The parameter corresponding to the any subsequence may be ±1. According to the foregoing solution, the first base sequence and the second base sequence are used as base sequences, and any one of the N subsequences in the first sequence is obtained by multiplying the base sequence by ±1. It can be ensured that the first sequence has a low PAPR in the entire bandwidth and also has a low PAPR on each RU/MRU. The first sequence also has a low PAPR on a plurality of spatial streams in a multi-spatial-stream transmission scenario, to fully ensure communication