Method and device for removing self-interference signal in environment using fdr mode

An apparatus for performing self-interference signal cancellation, the apparatus supporting a full duplex communication (FDR) mode, the apparatus comprising:

• a transmitted configured to transmit a signal to a target node in a predetermined time interval;
• a radio frequency (RF) unit configured to generate and store a residual self-interference signal after cancelling an analog self-interference signal associated with the signal;
• a receiver configured to receive an acknowledgement/negative-acknowledgement (ACK/NACK) signal from the target node in response to the transmitted signal;
• and
• a processor configured to determine whether to use the stored residual self-interference signal later based on the ACK/NACK signal.