Signal transmission method and apparatus

A signal transmission method, wherein the method comprises:

• in a communications system:
• determining, by the communications system, a quantity of reception sampling points;
• when a signal is received, performing autocorrelation processing on the signal according to the quantity of the reception sampling points and based on a preset rule, wherein the signal comprises a target signal from a transmit-end device, a short training sequence field of the target signal carries a short training sequence symbol, the short training sequence symbol is used to indicate a target short training sequence, the target sequence is generated by the transmit-end device according to a symbol sequence and an initial short training sequence after the transmit-end device generates the initial short training sequence, and the symbol sequence is generated by the transmit-end device according to the quantity of the reception sampling points, so that only one peak value greater than a preset target threshold exists in a processing result obtained through the autocorrelation processing, a location of the one peak value is determined, and initial time synchronization is performed on a target signal according to the location of the one peak value;
• and
• determining, by the communications system, a location of the peak value, and performing initial time synchronization on the target signal according to the location of the peak value.

A signal transmission apparatus, wherein the apparatus comprises:

• a processor, configured to:
• generate an initial short training sequence, wherein the initial short training sequence comprises M sub-sequences b, and each of the sub-sequences b comprises N transmission sampling points;
• determine a quantity of reception sampling points used by a receive-end device when the receive-end device performs autocorrelation processing;
• generate a symbol sequence according to the quantity of the reception sampling points, wherein the symbol sequence is represented as {a0,a1, . . . , ai, . . . , aK-1},
• generate a target short training sequence according to the symbol sequence and the initial short training sequence, wherein the target short training sequence is represented as {a0b,a1b, . . . , aib, . . . , aK-1b}, so that only one peak value greater than a preset target threshold exists in a processing result obtained through autocorrelation processing that is performed by the receive-end device on the target short training sequence according to a preset rule, and
• determine a location of the one peak value, and performing initial time synchronization on a target signal according to the location of the one peak value;
• and
• a transmitter, in communication with the processor and configured to send a target signal to the receive-end device, wherein a short training sequence field of the target signal carries a short training sequence symbol, and the short training sequence symbol is used to indicate the target short training sequence.

A signal transmission apparatus, wherein the apparatus comprises:

• a processor, configured to determine a quantity of reception sampling points;
• a receiver, in communication with the processor and configured to receive a signal;
• and
• the processor is further configured to perform autocorrelation processing on the signal according to the quantity of the reception sampling points and based on a preset rule, wherein the signal comprises a target signal from a transmit-end device, a short training sequence field of the target signal carries a short training sequence symbol, the short training sequence symbol is used to indicate a target short training sequence, the target sequence is generated by the transmit-end device according to a symbol sequence and an initial short training sequence after the transmit-end device generates the initial short training sequence, the symbol sequence is generated by the transmit-end device according to the quantity of the reception sampling points, so that only one peak value greater than a preset target threshold exists in a processing result obtained through the autocorrelation processing, and a location of the one peak value is determined, and initial time synchronization is performed on a target signal according to the location of the one peak value;
• and
• determine a location of the one peak value, and perform initial time synchronization on the target signal according to the location of the one peak value.