Signal sending method, signal receiving method, and apparatus

A signal receiving method, applied to a guard-band (GB) deployment mode or a standalone (SA) deployment mode, and comprising:

• receiving, by a terminal device, a first subframe from a network device, wherein a first sequence is mapped to the last 11 orthogonal frequency division multiplexing (OFDM) symbols in the first subframe, a sequence that belongs to the first sequence and that is to be mapped to a first OFDM symbol to an Mth OFDM symbol is mapped to the first M OFDM symbols in the first subframe sequentially, the first OFDM symbol to the Mth OFDM symbol are M OFDM symbols of the last N OFDM symbols in the first subframe, N is greater than or equal to M, N is an integer greater than 0 and less than 12, M is an integer greater than 0 and less than 4;
• and
• performing, by the terminal device, sequence detection in the first subframe.

A communications apparatus, applied to a guard-band (GB) deployment mode or a standalone (SA) deployment mode, and comprising:

• a transceiver, configured to receive a first subframe from a network device, wherein a first sequence is mapped to the last 11 orthogonal frequency division multiplexing (OFDM) symbols in the first subframe, a sequence that belongs to the first sequence and that is to be mapped to a first OFDM symbol to an Mth OFDM symbol is mapped to the first M OFDM symbols in the first subframe sequentially, the first OFDM symbol to the Mth OFDM symbol are M OFDM symbols of the last N OFDM symbols in the first subframe, N is greater than or equal to M, N is an integer greater than 0 and less than 12, M is an integer greater than 0 and less than 4;
• and
• a processor, configured to perform sequence detection in the first subframe.