Signal Processing Method and Related Apparatus

A method, comprising:

• receiving, through a channel, a first signal and identification information;
• filtering out a partial signal at a target frequency in the first signal to obtain a second signal, wherein the second signal comprises M symbol sets, wherein each of the M symbol sets comprises N symbols, wherein M is an integer greater than 1, wherein N is an integer greater than 1, and wherein the identification information indicates polarity inversion statuses of the N symbols in each of the M symbol sets;
• and
• inverting, based on the identification information, a polarity of at least one of the N symbols in at least one of the M symbol sets to obtain a third signal comprising M×N symbols.

A transmitter device, comprising:

• a processor configured to:
• obtain a first modulated signal comprising M symbol sets, wherein each of the M symbol sets comprises N symbols, wherein M is an integer greater than 1, and wherein N is an integer greater than 1;
• invert a polarity of at least one of the N symbols in at least one of the M symbol sets to obtain a second modulated signal comprising M×N symbols, wherein power of the second modulated signal at a target frequency is less than power of the first modulated signal at the target frequency;
• and
• generate identification information indicating polarity inversion statuses of the N symbols in each of the M symbol sets;
• and
• a transceiver coupled to the processor and configured to send the second modulated signal and the identification information.

A receiver device, comprising:

• a transceiver configured to receive, through a channel, a first signal and identification information;
• and
• a processor coupled to the transceiver and configured to:
• filter out a partial signal at a target frequency in the first signal to obtain a second signal, wherein the second signal comprises M symbol sets, wherein each of the M symbol sets comprises N symbols, wherein M is an integer greater than 1, wherein N is an integer greater than 1, and wherein the identification information indicates polarity inversion statuses of the N symbols in each of the M symbol sets;
• and
• invert, based on the identification information, a polarity of at least one of the N symbols in at least one of the M symbol sets.