A signal sending method, a signal receiving method, and an apparatus are provided. The method includes: A network device generates a first sequence, where the network device maps the first sequence to the last 11 orthogonal frequency division multiplexing OFDM symbols in a first subframe, and maps, to the first M OFDM symbols in the first subframe sequentially, a second sequence that belongs to the first sequence, where the second sequence is a sequence that is mapped to M OFDM symbols in a last N OFDM symbols of the first subframe, N is greater than or equal to M, N is an integer greater than 0 and less than 12, and M is an integer greater than 0 and less than 4; and the network device sends the first subframe.