US-12627546-B2 - Signal transmission method and apparatus

Abstract

This application provides a signal transmission method and apparatus, applied to automatic driving, assisted driving, and the like. The method includes: A first device generates a first signal, where the first signal includes a first part and a second part, the second part is modulated in a phase shift keying PSK modulation scheme, the second part is encoded by using polar code, the first part is used to transmit a preconfigured sequence, a predefined sequence, or a sequence generated according to a predefined rule, and the second part is used to transmit control information. The first device sends the first signal to a second device. The second device obtains the control information. The PSK modulation scheme can improve sensitivity of a signal receive end, and improve anti-noise and anti-interference capabilities. In addition, the second part is encoded by using the polar code, which can improve anti-noise and anti-interference performance.

Inventors

• Lei Gao
• Xingqing CHENG

Assignees

• HUAWEI TECHNOLOGIES CO., LTD.

Dates

Publication Date

20260512

Application Date

20231214

Claims (17)

1. 1 . A signal transmission method, comprising: generating, by a device comprising a transceiver, a first signal comprising a first part and a second part, wherein the second part is used to transmit control information and is modulated in a phase shift keying (PSK) modulation scheme and encoded using polar code, the first part successively comprises a preamble sequence and at least one first sequence comprising at least one of an M-sequence or a second sequence generated based on an identifier of at least one of a first device or a link of the first device; and the first part is used to transmit at least one of a preconfigured sequence, a predefined sequence, or a sequence generated according to a predefined rule; and transmitting, by the transceiver, the first signal over a wireless communication channel, comprising: transmitting the first part; and transmitting the second part after the first part is transmitted.
2. 2 . The method according to claim 1 , wherein the method further comprises: sending a second signal, wherein the second signal is modulated in a Gaussian frequency-shift keying (GFSK) modulation scheme.
3. 3 . A data transmission method, comprising: receiving, by a device comprising a transceiver, a first signal comprising a first part and a second part over a wireless communication channel, comprising: receiving the first part; and receiving the second part after the first part is received, wherein the second part is used to transmit control information and is modulated in a phase shift keying (PSK) modulation scheme and encoded using polar code; the first part successively comprises a preamble sequence and at least one first sequence comprising at least one of an M-sequence or a second sequence generated based on an identifier of at least one of a first device or a link of the first device; and the first part is used to transmit at least one of a predefined sequence or a sequence generated according to a predefined rule; and obtaining the control information.
4. 4 . The method according to claim 3 , wherein the method further comprises: receiving a second signal, wherein the second signal is modulated in a Gaussian frequency-shift keying (GFSK) modulation scheme.
5. 5 . The method according to claim 3 , wherein the first part is modulated in the PSK modulation scheme.
6. 6 . The method according to claim 3 , wherein the first signal further comprises a data part that is modulated in the PSK modulation scheme.
7. 7 . The method according to claim 6 , wherein at least two among the first part, the second part, and the data part comprise same symbol rates.
8. 8 . The method according to claim 6 , wherein a symbol rate of the data part is 1 megahertz, 2 megahertz, or 4 megahertz.
9. 9 . The method according to claim 3 , wherein the first part comprises two same sequences.
10. 10 . The method according to claim 3 , wherein the second part is encoded using a first modulation scheme and a first code rate, wherein the first modulation scheme is the PSK modulation scheme and is preconfigured or predefined, and the first code rate is preconfigured, predefined, or determined according to a predefined rule for the first code rate; or the first modulation scheme and the first code rate is selected based on a first set that indicates at least one combination of a modulation scheme and a code rate; or the first modulation scheme is selected based on a second set that indicates at least one modulation scheme and the first code rate is selected based on a third set that indicates at least one code rate.
11. 11 . The method according to claim 10 , wherein the first part indicates the first modulation scheme and/or the first code rate.
12. 12 . The method according to claim 3 , wherein the second part comprises a cyclic redundancy check bit.
13. 13 . The method according to claim 12 , wherein the second part is scrambled using a third sequence, or the cyclic redundancy check bit comprised in the second part is scrambled using the third sequence, and wherein the third sequence is a sequence generated based on the identifier of at least one of the first device or the link of the first device.
14. 14 . The method according to claim 6 , wherein the data part is encoded using the polar code.
15. 15 . The method according to claim 3 , wherein the second part indicates at least one of the following: whether a data part is encoded using the polar code; a code rate for polar code encoding of the data part; a modulation scheme of the data part; length information of the data part; a number of transmission data of the data part; a number of a protocol data unit (PDU) of the data part; a number of a payload in the PDU of the data part; whether the transmission data of the data part is retransmitted; whether the PDU of the data part is retransmitted; whether the payload in the PDU of the data part is retransmitted; feedback information of transmission data of a second device; feedback information of a PDU of the second device; feedback information of a payload in the PDU of the second device; a number of data expected to be transmitted by the second device a next time; a number of a PDU expected to be transmitted by the second device the next time; a number of a payload in the PDU expected to be transmitted by the second device the next time; whether the data expected to be transmitted by the second device the next time is retransmitted; whether the PDU expected to be transmitted by the second device the next time is retransmitted; whether the payload in the PDU expected to be transmitted by the second device the next time is retransmitted; information about whether the data part exists; whether the data part comprises the PDU; whether the payload in the PDU of the data part is null; a type of data in the data part; a type of the PDU in the data part; a type of the payload of the PDU in the data part; grouping information of the data in the data part; grouping information of the PDU in the data part; grouping information of the payload of the PDU in the data part; whether to continue to send data by using a currently allocated or currently used resource or resource unit; whether to continue to receive data by using the currently allocated or currently used resource or resource unit; whether there is data to be sent; or whether data continues to be received.
16. 16 . The method according to claim 3 , wherein the first signal is used for broadcast, the second part comprises type information of the broadcast, and the type information of the broadcast comprises at least one of the following: whether the broadcast is scanned, whether the broadcast is connected, whether the broadcast is used for directional transmission, or whether the broadcast is used for non-directional transmission.
17. 17 . A device, comprising: a transceiver configured to transmit a signal; a processor; and a memory comprising computer instructions that, when executed by the processor, cause the device to: generate a signal comprising a first part and a second part, wherein the second part is used to transmit control information and is modulated in a phase shift keying (PSK) modulation scheme and encoded using polar code, the first part successively comprises a preamble sequence and at least one first sequence comprising at least one of an M-sequence or a second sequence generated based on an identifier of at least one of a first device or a link of the first device; and the first part is used to transmit at least one of a preconfigured sequence, a predefined sequence, or a sequence generated according to a predefined rule; and transmit, by the transceiver, the signal over a wireless communication channel, the transceiver further configured to: transmit the first part; and transmit the second part after the first part is transmitted.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application is a continuation of International Application No. PCT/CN2021/100626, filed on Jun. 17, 2021, the disclosure of which is hereby incorporated by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a signal transmission method and apparatus. BACKGROUND In a wireless communication scenario, there may be a plurality of communication domains in a communication area or range. One communication domain is a system including: a group of communication nodes that have a communication relationship, and a communication connection relationship (namely, a communication link) between the communication nodes. One communication domain includes one primary communication node (which may be referred to as a primary node for short) and at least one secondary communication node (which may be referred to as a secondary node for short). The primary node manages a time-frequency resource of the communication domain, and has a function of scheduling a resource for the communication link between the communication nodes in the communication domain. Generally, a plurality of communication domains exist densely. Because the communication domains work independently, there may be mutual interference between the communication domains. However, currently, anti-interference performance is poor during signal transmission between communication nodes. As a result, the signal transmission may fail. SUMMARY This application provides a signal transmission method and apparatus, to improve anti-interference performance during signal transmission between communication nodes. According to a first embodiment, this application provides a signal transmission method. The method may be applied to a first device, and a processor, a chip, a chip system, a function module, or the like of the first device. The method may include: generating a first signal, where the first signal includes a first part and a second part, the second part may be modulated in a phase shift keying (PSK) modulation scheme, the second part may be encoded by using polar code, the first part may be used to transmit a preconfigured sequence, a predefined sequence, or a sequence generated according to a predefined rule, and the second part may be used to transmit control information; and sending the first signal. According to the method, the control information in the first signal is modulated in the PSK modulation scheme. Compared with a frequency modulation-type modulation scheme and an amplitude modulation-type modulation scheme, in the PSK modulation scheme, receiving sensitivity of a signal receive end to the control information can be improved, and anti-noise and anti-interference performance can be improved. The control information is encoded by using the polar code. This can also improve receiving sensitivity of the signal receive end to the control information, and can improve anti-noise and anti-interference performance. The control information is modulated in the PSK modulation scheme and encoded by using the polar code. This can improve accuracy of receiving the control information by the signal receive end, thereby improving reliability of content indicated by the control information, and ensuring reliability of data transmission. In an embodiment, the first part may be modulated in the PSK modulation scheme. The first part and the second part have a same modulation scheme or a same type of a modulation scheme, and results of synchronization and channel estimation at the signal receive end can better adapt to a demodulation requirement of the second part, so that anti-noise and anti-interference performance of signal transmission can be improved. In addition, the first part and the second part use a same modulation scheme or a same type of modulation scheme, so that implementation complexity of a signal transmit end and the signal receive end can be reduced. In an embodiment, the first part may successively include a preamble sequence and at least one first sequence, the first sequence may include an M-sequence and/or a second sequence, and the second sequence may be a sequence generated based on an identifier of a first device and/or a sequence generated based on an identifier of a link of the first device. In this way, synchronization and channel estimation performance at the signal receive end can be improved. A side lobe of an autocorrelation function of the M-sequence is small, and a probability of errors occurring in synchronization and channel estimation is low. Therefore, the M-sequence has excellent synchronization and channel estimation performance at a low signal to interference plus noise ratio. Because identifiers of different devices and/or identifiers of different links are usually different, sequences generated based on the identifiers of the different devices and/or the identifiers of the different links are usually differe