Patent ID: 7433421

Claim:
A distortion compensation apparatus comprising: an update calculation section calculating a distortion compensation coefficient by use of an adaptive algorithm, so as to reduce a differential signal between a reference signal, which is a transmission signal, and a feedback signal, the reference signal and the feedback signal being complex signals; a distortion compensation coefficient storage of which stored content is updated by the calculated distortion compensation coefficient; a distortion compensation section performing distortion compensation to the transmission signal, based on the distortion compensation coefficient being read out from the distortion compensation coefficient storage; a correlation calculation section calculating a real part of correlation and an imaginary part of correlation of each the reference signal and the feedback signal; and a phase rotation section compensating a relative phase deviation between the reference signal and the feedback signal, based on the real part of correlation and the imaginary part of correlation calculated by the correlation calculation section, wherein the update calculation section calculates a distortion compensation coefficient using the post-compensation signal.