Full-duplex digital self-interference clear method and apparatus

A full-duplex digital self-interference clear apparatus, comprising a transmit link, a receive link, an auxiliary link, a self-adaptive learning module, a pre-distortion processing module, and a self-interference clear module, wherein the pre-distortion processing module is connected to the self-adaptive learning module, the auxiliary link, and the self-interference clear module, and the self-adaptive learning module is connected to the transmit link and the receive link;

• wherein the transmit link is configured to send a first signal to a peer device under the condition that a signal is transmitted with the peer device in a full-duplex mode;
• wherein the receive link is configured to receive a second signal sent from the peer device under the condition that the signal is transmitted with the peer device in the full-duplex mode;
• wherein the transmit link is further configured to send a preamble sequence before the signal is transmitted with the peer device in the full-duplex mode;
• wherein the self-adaptive learning module is configured to, before the signal is transmitted with the peer device in the full-duplex mode, perform a calculation by a self-adaptive algorithm to obtain a pre-distortion processing coefficient according to the preamble sequence sent from the transmit link, the first interference signal generated by the preamble sequence in the receive link, and the first reconstructed interference signal obtained by performing pre-distortion processing and reconstruction on the preamble sequence;
• wherein the pre-distortion processing module and the auxiliary link are configured to perform pre-distortion processing and reconstruction on the preamble sequence to obtain the first reconstructed interference signal, and under the condition that the signal is transmitted with the peer device in the full-duplex mode, perform pre-distortion processing on the first signal sent from the transmit link to the peer device according to the pre-distortion processing coefficient to obtain a second reconstructed interference signal;
• and
• wherein the self-interference clear module is configured to perform self-interference clear according to the second reconstructed interference signal and a second interference signal of the receive link, the second interference signal of the receive link being a signal obtained through superimposition of an interference signal generated by the first signal in the receive link and the second signal received by the receive link from the peer device.