When using the Full Duplex Radio (FDR) method, a communication device for removing a self-interference signal is configured to transmit a plurality of reference signals including a first reference signal and a second reference signal within a communication band allocated to the communication device. A configured transmitter; A receiver configured to receive self-interference signals corresponding to the first and second reference signals through a self-interference channel; A communication modem for transmitting a control signal for minimizing a difference between the power sum of the self-interference signals and the power of the self-interference reference signal; And a self-interference reference signal generator configured to generate the self-interference reference signal according to the control signal.
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