LEAKAGE SIGNAL CANCELLER

摘要

A quadrature modulator (202) takes out a part of a transmission signal and generates a cancel signal. A signal comparison means (300) compares the amplitude and phase of the cancel signal generated from the quadrature modulator (202) with those of a received signal and outputs a signal corresponding to comparison result to the quadrature modulator (202). The quadrature modulator (202) generates a cancel signal based on the output signal from the signal comparison means (300) and they perform feedback control such that the cancel signal and a leakage signal have an equal amplitude and become in-phase. A synthesizer (205) synthesizes the cancel signal outputted from the quadrature modulator (202) and its reverse phase cancel signal thus canceling the leakage signal.