Abstract: Embodiments of this application are applied to a wireless local area network system that supports 802.11 series protocols, for example, a next-generation Wi-Fi protocol of IEEE 802.11ax, such as 802.11be, Wi-Fi 7, or EHT, or for another example, a next-generation protocol of 802.11be or Wi-Fi 8, and may be further applied to an ultra-wideband UWB-based wireless personal area network system or a sensing (sensing) system. Embodiments of this application provide a communication method and apparatus. The method includes: generating a synchronization header field based on a sequence set, where the sequence set includes at least one of the following sequences: a sequence with a length of 127, a sequence with a length of 31, a sequence with a length of 91, or a sequence with a length of 64; and sending the synchronization header field.

Abstract: A PPDU-based communication method and an apparatus are disclosed One example method includes: A transmit end generates a PPDU based on a mapping relationship between a data symbol and a chip sequence, and sends the PPDU; and correspondingly, a receive end receives the PPDU, and then processes the PPDU based on the mapping relationship, where a minimum Hamming distance is greater than or equal to L/2.

Abstract: A method includes sending, by a communication apparatus, configuration information. The configuration information includes a quantity of cyclic shift positions that corresponds to each device, the quantity of cyclic shift positions is used to cyclically shift a perfect sequence, and quantities that are of cyclic shift positions and that correspond to devices used for completing different services are different. The method is applied to an ultra-wideband (UWB)-based wireless personal local area network system, a sensing system, and the like, including 802.15 series protocols, such as an 802.15.4a protocol, an 802.15.4z protocol, or an 802.15.4ab protocol. The method is further applied to a wireless local area network system that can support a next-generation WI-FI protocol of 802.11ax, such as 802.11be, Wi-Fi 7, or extremely high-throughput (EHT), and 802.11 series protocols, such as a next generation of 802.11be or WI-FI 8.

Abstract: This application relates to a UWB-based PPDU transmission method and a related apparatus. The method includes: Two communication parties exchange a PPDU. The PPDU includes a preamble sequence. The preamble sequence is obtained by inserting one or more 0s into a sequence in a sequence set. At least some sequences in the sequence set have a zero cross-correlation zone. According to embodiments of this application, anti-interference performance of a UWB system can be improved. This application is applied to a UWB-based wireless personal area network system, a sensing system, or the like, and includes 802.15 series protocols, such as an 802.15.4a protocol, an 802.15.4z protocol, or an 802.15.4ab protocol. This application may also support wireless local area network systems of 802.11 series protocols, such as a next-generation Wi-Fi protocol of 802.11ax, for example, 802.11be, that is, Wi-Fi 7 or EHT, or the next generation of 802.11be, that is, Wi-Fi 8.

Abstract: A communication method includes generating a first sequence, where the first sequence is based on a complete complementary code set, the complete complementary code set is based on a Golay pair and a Hadamard matrix through a Kronecker product operation, and the first sequence is used for channel estimation; and sending the first sequence. In the method, use of a P-matrix is avoided in a process of constructing a plurality of streams of zero correlation sequences.

Abstract: An ultra-wideband (UWB) signal transmission method includes that a plurality of initiators simultaneously sends a UWB signal. A UWB signal sent by any initiator is obtained by performing pulse shaping and modulation on a first sequence. The first sequence is obtained by performing a cyclic shift on a second sequence, and a number of cyclic shift bits is determined based on a shift factor and a step size of the cyclic shift that are of the any initiator. A responder determines time of arrival of the plurality of UWB signals based on the plurality of received UWB signals and the second sequence.

Abstract: This application relates to signal processing methods and apparatuses. An example method includes generating a physical layer protocol data unit (PPDU) and sending the PPDU. The PPDU includes a first field, and the first field includes M sequences. The M sequences include a first sequence, a second sequence, a third sequence, and a fourth sequence. A partial sequence in the first sequence, a partial sequence in the second sequence, a partial sequence in the third sequence, and a partial sequence in the fourth sequence are determined based on Golay complementary sequences.

Abstract: This application provides a sounding frame transmission method and a related apparatus. The method is applied to a first device, and the method includes: generating a sounding frame, where the sounding frame includes a first field, the first field includes a predefined first sequence, the first sequence includes a sequence obtained after a second sequence is modulated by using at least one of the following modulation modes, and the modulation modes include: QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM; and sending the sounding frame. In this way, channel quality of a communication link in at least one of modulation modes of QPSK, 16-QAM, 64-QAM, 256-QAM, 1024-QAM, and 4096-QAM can be accurately measured when channel measurement is performed by using the first sequence, thereby enriching application scenarios of an EHT-LTF sequence.

Abstract: A long training field sequence transmission method and apparatus are provided, to send an LTF sequence on a discrete RU, and reduce a PAPR. The method includes: A STA determines an first LTF sequence, the first LTF sequence is a sequence segment that is in a total LTF sequence corresponding to a channel bandwidth and that corresponds to a first RU, N subcarriers in the channel bandwidth are in a one-to-one correspondence with N components of the total LTF sequence, the first RU is M consecutive first subcarriers in the N subcarriers, the first LTF sequence is M components in the N components; and the STA sends the first LTF sequence to an AP on a discrete RU, where the discrete RU includes M inconsecutive second subcarriers, and the M components of the first LTF sequence are respectively sent on the M inconsecutive second subcarriers.

Abstract: A data transmission method. A physical layer protocol data unit (PPDU) is generated. The PPDU includes a training field. The training field includes a sequence used for target sensing. The PPDU is sent.

Abstract: Embodiments of this application provide a method and an apparatus for transmitting a physical layer protocol data unit, to design a short training field sequence for a larger channel bandwidth. The short training field sequence designed in this application has a smaller peak-to-average power ratio PAPR and better performance. The method includes: generating a physical layer protocol data unit PPDU that complies with the 802.11be standard, where the PPDU includes a short training field, and a quantity of subcarriers of a frequency domain sequence of the short training field is greater than 2048; and sending the PPDU on a target channel, where a bandwidth of the target channel is greater than or equal to 160 MHz.

Abstract: This application provides a method and apparatus for transmitting a physical layer protocol data unit, so as to design a long training field sequence for a larger channel bandwidth. The method includes: generating a physical layer protocol data unit PPDU, where the PPDU includes a long training field, a length of a frequency domain sequence of the long training field is greater than a first length, and the first length is a length of a frequency domain sequence of a long training field of a PPDU transmitted over a channel whose bandwidth is 160 MHz; and sending the PPDU over a target channel, where a bandwidth of the target channel is greater than 160 MHz.

Abstract: Example methods for transmitting a physical layer protocol data unit (PPDU) and apparatus are described. One example method includes generating and transmitting a PPDU that includes a long training field (LTF). A length of a frequency-domain sequence of the LTF is greater than a first length, and the first length is a length of a frequency-domain sequence of an LTF of a first PPDU transmitted over a channel whose bandwidth is 160 MHz.