Transmitter and interference cancellation method

A transmitter, comprising:

• a first digital predistorter (DPD) located on a first transmit channel of the transmitter connected to a power amplifier (PA) located on the first transmit channel of the transmitter;
• a first processor located on a feedback channel of the transmitter, wherein the first processor is separately connected to the PA and the first DPD, wherein the first DPD is configured to perform linear predistortion on a baseband signal preceding a first baseband signal on the first transmit channel, to generate a second predistortion signal, and send the second predistortion signal to the first processor;
• a control switch, wherein the first processor is connected to the PA through the control switch;
• and
• a first non-transitory computer-readable storage medium including computer-executable instructions executed by the first processor to perform, on the transmitter, operations comprising:
• when a status of the control switch is grounded or floating, collecting a feedback interference signal of the feedback channel, acquiring a first parameter according to a correlation between the second predistortion signal sent by the first DPD and the feedback interference signal, and acquiring a feedback cancellation signal according to the first parameter and the second predistortion signal;
• performing, according to the feedback cancellation signal, interference cancellation on a signal of the feedback channel, to obtain a first mixed signal;
• sending, the first mixed signal to the first DPD, wherein the first DPD is further configured to perform linear predistortion processing according to the first baseband signal on the first transmit channel and the first mixed signal, to generate a first predistortion signal;
• amplifying, by the PA, a to-be-transmitted signal;
• and
• then transmitting, by using an antenna, the amplified to-be-transmitted signal, wherein the to-be-transmitted signal is the first predistortion signal or a signal obtained according to the first predistortion signal.