Signal transmission method and apparatus

A communication apparatus, comprising a processor and a transceiver, wherein

• the processor is configured to:
• obtain a first bit sequence;
• map the first bit sequence to a first modulation symbol sequence, wherein a value of each modulation symbol in the first modulation symbol sequence belongs to a first constellation point set, the first constellation point set comprises K modulation symbols, each of the K modulation symbols has a different amplitude, K≥2, and K is an integer, wherein the first constellation point set further comprises a first modulation symbol and a second modulation symbol;
• perform a discrete Fourier transform (DFT) on each modulation symbol in the first modulation symbol sequence to obtain a second modulation symbol sequence;
• perform weighting on the second modulation symbol sequence to obtain a third modulation symbol sequence;
• and perform an inverse discrete Fourier transform (IFFT) on the third modulation symbol sequence to obtain a first signal;
• obtain a second bit sequence;
• map the second bit sequence to a fourth modulation symbol sequence, wherein a value of each modulation symbol in the fourth modulation symbol sequence belongs to a second constellation point set, the second constellation point set comprises a third modulation symbol and a fourth modulation symbol, an amplitude of the third modulation symbol is different from an amplitude of the fourth modulation symbol, and a ratio of the amplitude of the third modulation symbol to the amplitude of the fourth modulation symbol is different from a ratio of an amplitude of the first modulation symbol to an amplitude of the second modulation symbol;
• perform a DFT on each modulation symbol in the fourth modulation symbol sequence to obtain a fifth modulation symbol sequence;
• perform weighting on the fifth modulation symbol sequence to obtain a sixth modulation symbol sequence;
• and perform an IFFT on the sixth modulation symbol sequence to obtain a third signal;
• and
• the transceiver is configured to:
• send a second signal, wherein the second signal comprises the first signal;
• and send the third signal.

A non-transitory computer-readable storage medium storing instructions which, when executed by a communication apparatus, cause the communication apparatus to perform operations comprising:

• obtaining a first bit sequence;
• mapping the first bit sequence to a first modulation symbol sequence, wherein a value of each modulation symbol in the first modulation symbol sequence belongs to a first constellation point set, the first constellation point set comprises K modulation symbols, each of the K modulation symbols has a different amplitude, K≥2, and K is an integer, wherein the first constellation point set further comprises a first modulation symbol and a second modulation symbol;
• performing a discrete Fourier transform (DFT) on each modulation symbol in the first modulation symbol sequence to obtain a second modulation symbol sequence;
• performing weighting on the second modulation symbol sequence to obtain a third modulation symbol sequence;
• performing an inverse discrete Fourier transform (IFFT) on the third modulation symbol sequence to obtain a first signal;
• sending a second signal, wherein the second signal comprises the first signal;
• obtaining a second bit sequence;
• mapping the second bit sequence to a fourth modulation symbol sequence, wherein a value of each modulation symbol in the fourth modulation symbol sequence belongs to a second constellation point set, the second constellation point set comprises a third modulation symbol and a fourth modulation symbol, an amplitude of the third modulation symbol is different from an amplitude of the fourth modulation symbol, and a ratio of the amplitude of the third modulation symbol to the amplitude of the fourth modulation symbol is different from a ratio of an amplitude of the first modulation symbol to an amplitude of the second modulation symbol;
• performing a DFT on each modulation symbol in the fourth modulation symbol sequence to obtain a fifth modulation symbol sequence;
• performing weighting on the fifth modulation symbol sequence to obtain a sixth modulation symbol sequence;
• performing an IFFT on the sixth modulation symbol sequence to obtain a third signal;
• and
• sending the third signal.