Full-duplex self-interference cancellation method and apparatus

A full-duplex self-interference cancellation apparatus, comprising:

• a time reversal filter, configured to time reversal-filter a sending signal;
• a first self-interference reconstruction module, configured to perform self-interference reconstruction on a time reversal-filtered sending signal, to obtain a first-level self-interference reconstruction signal;
• a second self-interference reconstruction module, configured to directly perform self-interference reconstruction on the sending signal, to obtain a second-level self-interference reconstruction signal;
• and
• a combiner, configured to perform, based on the first-level self-interference reconstruction signal and the second-level self-interference reconstruction signal, self-interference cancellation on a radio frequency signal received by a receive antenna.

A full-duplex self-interference channel measurement method, wherein the method comprises:

• performing first-level self-interference cancellation on a sending signal in a half-duplex timeslot, to obtain a first residual self-interference signal;
• performing residual self-interference channel estimation based on the first residual self-interference signal, to obtain an impulse response to a first residual self-interference channel;
• time reversal-filtering the sending signal based on the impulse response to the first residual self-interference channel;
• performing first-level self-interference cancellation on a time reversal-filtered sending signal, to obtain a second residual self-interference signal;
• performing second-level self-interference cancellation on the second residual self-interference signal, to obtain a third residual self-interference signal;
• and
• performing residual self-interference channel estimation based on the third residual self-interference signal, to obtain an impulse response to a second residual self-interference channel, wherein the impulse response to the second residual self-interference channel is applied to digital interference cancellation in a full-duplex timeslot.