Signal sending method and apparatus, and signal receiving method and apparatus

A signal sending apparatus, comprising:

• a processing unit, configured to map a first sequence {pia0, pia1, . . . , piaP−1} into an ith subcarrier group in M subcarrier groups, wherein a length of the first sequence is P, the M subcarrier groups are in a same time cell, the ith subcarrier group comprises K consecutive subcarriers that are evenly distributed, M≥2, P≥2, K≥2, P≤K, M, P, and K are all positive integers, and i=1, 2, . . . , M, wherein there are at least two consecutively numbered subcarrier groups in the M subcarrier groups:
• an sth subcarrier group and an (s+1)th subcarrier group, wherein s is a positive integer, wherein a minimum interval between a center frequency of any subcarrier in the sth subcarrier group and a center frequency of any subcarrier in the (s+1)th subcarrier group is greater than one subcarrier, and a second sequence {pi} corresponding to the M subcarrier groups meets the following requirement:
• A sequence {xi} is a Barker sequence, wherein x1=ps+1, x2=ps+2, . . . , xM−s=pM, xM−s+1=p1, xM−s+2=p2, . . . , xM=ps, or a sequence {cxi} is a second sequence corresponding to M consecutive subcarrier groups, wherein c is a non-zero complex number, wherein
• the processing unit is further configured to generate a sending signal based on signals on subcarriers in the ith subcarrier group;
• and
• a sending unit, configured to send the sending signal generated by the processing unit.

A signal receiving apparatus, comprising:

• a processing unit, configured to generate a first sequence {pia0, pia1, . . . , piaP−1} on an ith subcarrier group in M subcarrier groups, wherein a length of the first sequence is P, the M subcarrier groups are in a same time cell, the ith subcarrier group comprises K consecutive subcarriers that are evenly distributed, M≥2, P≥2, K≥2, P≤K, M, P, and K are all positive integers, and i=1, 2, . . . , M, wherein there are at least two consecutively numbered subcarrier groups in the M subcarrier groups:
• an sth subcarrier group and an (s+1)th subcarrier group, wherein s is a positive integer, wherein a minimum interval between a center frequency of any subcarrier in the sth subcarrier group and a center frequency of any subcarrier in the (s+1)th subcarrier group is greater than one subcarrier and a second sequence {pi} corresponding to the M subcarrier groups meets the following requirement:
• A sequence {xi} is a Barker sequence, wherein x1=ps+1, x2=ps+2, . . . , xM−s=pM, xM−s+1=p1, xM−s+2=p2, . . . , xM=ps, or a sequence {cxi} is a second sequence corresponding to M consecutive subcarrier groups, wherein c is a non-zero complex number;
• and
• a receiving unit, configured to receive a sending signal on the ith subcarrier group, wherein
• the processing unit is further configured to process, by using the first sequence, the sending signal received by the receiving unit.