Receiver, communication device, and signal processing method

A device for communication, wherein the device comprises a receiver, a transmitter, and a circuit board, wherein the receiver is configured to receive a first signal, wherein the receiver comprises a frequency mixer, a phase switching module, and an intermediate frequency processor, and wherein:

• the phase switching device is coupled to the frequency mixer, the phase switching device is configured to provide a first local oscillator signal for the frequency mixer or provide a second local oscillator signal for the frequency mixer, and a difference between a phase of the first local oscillator signal and a phase of the second local oscillator signal is a first phase difference;
• the frequency mixer is coupled to the intermediate frequency processor, and the frequency mixer is configured to:
• receive a signal provided by the phase switching device;
• perform frequency mixing on the first signal based on the signal provided by the phase switching device;
• and
• provide a signal obtained through frequency mixing for the intermediate frequency processor;
• the intermediate frequency processor is configured to amplify the signal provided by the frequency mixer;
• the transmitter is disposed on the circuit board and is configured to transmit a signal;
• and
• the receiver is disposed on the circuit board, and the receiver is configured to:
• receive a first signal;
• and
• perform frequency mixing on the first signal, wherein the first signal is coupled to the signal output by the transmitter.

A method for processing a signal, wherein the method comprises:

• providing, by a phase switching device, a first local oscillator signal or a second local oscillator signal for a frequency mixer, wherein a difference between a phase of the first local oscillator signal and a phase of the second local oscillator signal is a preset first phase difference;
• performing, by the frequency mixer, frequency mixing on a received first signal based on a signal provided by the phase switching device;
• and
• amplifying, by an intermediate frequency processor, a signal provided by the frequency mixer.