Data compression method and apparatus

A communications apparatus, comprising a processor and a communications interface, wherein

• the processor is configured to perform first processing on binary phase shift keying (BPSK) modulated data with a length of M, to obtain first frequency domain data with a length of M, wherein the first processing comprises Fourier transform, and M is an even number;
• the processor is further configured to perform second processing on second frequency domain data with a length of Q, to obtain time domain data, wherein data in the second frequency domain data is comprised in the first frequency domain data, Q is a positive integer, M is greater than Q, Q is greater than or equal to M/2, and the second processing comprises inverse Fourier transform;
• and
• the processor sends the time domain data on one time domain symbol through the communications interface.

A non-transitory computer-readable storage medium, comprising instructions, wherein when the instructions are executed by at least one processor, cause the at least one processor to perform operations comprising:

• performing first processing on π/2-binary phase shift keying (BPSK) modulated data with a length of M, to obtain first frequency domain data with a length of M, wherein the first processing comprises Fourier transform, and M is an even number;
• performing second processing on second frequency domain data with a length of Q, to obtain time domain data, wherein data in the second frequency domain data is comprised in the first frequency domain data, Q is a positive integer, M is greater than Q, Q is greater than or equal to M/2, and the second processing comprises inverse Fourier transform;
• and
• sending the time domain data on one time domain symbol.