Abstract: In order to carry out high-precision control of distortion compensation, a received signal is split into two signals. One of the resulting signals ("the first signal") is provided to a distortion generator with similar characteristics to the distortion produced at the signal transmitting side, and the phase and amplitude of the other of the resulting signals ("the second signal") are controlled. By adding these two signals, the desired signal is suppressed and only the distortion component is extracted. This process is controlled by correlation detection of the desired signal. Next, the distortion component contained in the second signal is removed by controlling the phase and amplitude of this extracted distortion component and adding the result to the second signal. This process is controlled by detecting the correlation between the extracted distortion component and the error component contained in the signal after the addition.