Interference cancellation method, device, and system

A first device comprising:

• a multiplexer, a jitter extraction submodule, a first interference reconstruction submodule, and a first interference cancellation submodule, wherein
• the multiplexer is configured to obtain a first transmit signal and a first pilot signal, multiplex the first transmit signal and the first pilot signal into a first signal, and send the first signal to a second device, and send a first self-interference signal, generated when the first transmit signal is sent to the second device, to a receive end of the first device, where the first transmit signal and the first pilot signal use different frequency bands;
• the jitter extraction submodule is configured to obtain the first pilot signal and a second signal, wherein the second signal comprises the first self-interference signal, a second pilot signal, and a second receive signal from the second device, wherein the second pilot signal is obtained after the first pilot signal undergoes a channel jitter, wherein frequency bands used by the first transmit signal and the second receive signal completely or partially overlap, and wherein the second receive signal and the second pilot signal use different frequency bands;
• the jitter extraction submodule is further configured to extract jitter information of the first self-interference signal based on the first pilot signal and the second pilot signal;
• the first interference reconstruction submodule is configured to obtain the first transmit signal and the jitter information of the first self-interference signal, and reconstruct a second self-interference signal based on the first transmit signal and the jitter information, to obtain a cancellation signal of the first self-interference signal;
• and
• the first interference cancellation submodule is configured to obtain the second signal and the cancellation signal of the first self-interference signal, and cancel the first self-interference signal from the second receive signal based on the cancellation signal.

A microwave transmission system comprising:

• a first device, a second device, and an intermediate frequency cable connecting the first device and the second device, wherein the first device is an indoor unit (IDU), and the second device is an outdoor unit (ODU);
• or the first device is an ODU, and the second device is an IDU;
• the first device is configured to send a first signal to the second device, wherein the first signal comprises a first transmit signal and a first pilot signal, and send a first self-interference signal, generated when the first transmit signal is sent to the second device, to a receive end of the first device, where the first transmit signal and the first pilot signal use different frequency bands;
• the second device is configured to send a second receive signal to the first device by using the intermediate frequency cable;
• the first device is further configured to obtain a second signal, wherein the second signal comprises the first self-interference signal, a second pilot signal, and the second receive signal from the second device, wherein the second pilot signal is obtained after the first pilot signal undergoes a channel jitter, wherein frequency bands used by the first transmit signal and the second receive signal completely or partially overlap, and wherein the second receive signal and the second pilot signal use different frequency bands;
• the first device is further configured to extract jitter information of the first self-interference signal based on the first pilot signal and the second pilot signal;
• the first device is further configured to reconstruct a second self-interference signal based on the first transmit signal and the jitter information, to obtain a cancellation signal of the first self-interference signal;
• and
• the first device is further configured to cancel the first self-interference signal from the second receive signal based on the cancellation signal.