Signal sending method and apparatus and signal receiving method and apparatus

A signal sending apparatus, comprising:

• a processor, configured to generate a first signal, wherein the first signal comprises at least one sequence pair, each of the at least one sequence pair comprises two sequences, and an element value of one sequence of the two sequences is a value obtained by multiplying or dividing an element value of the other sequence of the two sequences and an element value of a first sequence corresponding to the other sequence, wherein the first sequence is different than the other sequence, wherein each sequence in the at least one sequence pair and the first sequence are complex sequences with lengths greater than 1;
• and
• a transmitter, configured to send the first signal generated by the processor to a terminal device.

A signal receiving apparatus, comprising:

• a receiver, configured to receive a first signal, wherein the first signal comprises at least one sequence pair, each of the at least one sequence pair comprises two sequences, and an element value of one sequence of the two sequences is a value obtained by multiplying or dividing an element value of the other sequence of the two sequences and an element value of a first sequence corresponding to the other sequence, wherein the first sequence is different than the other sequence, wherein each sequence in the at least one sequence pair and the first sequence are complex sequences with lengths greater than 1;
• and
• a processor, configured to calculate, according to a target calculation rule, the element value of the one sequence of the two sequences received by the receiver and the element value of the other sequence of the two sequences, to obtain a third sequence corresponding to the other sequence, and obtain a timing position by using the first sequence and the third sequence.