Patent ID: 8655289

Claim:
A distortion compensation device comprising: a distortion compensator that predistorts an input signal based on delay signals and distortion compensation coefficients corresponding to the respective delay signals, the delay signals being obtained by applying different amounts of delay to the input signal; a calculator that calculates an error signal based on the predistorted input signal and an output signal from an amplifier that amplifies the predistorted input signal; a calculator that calculates prospective distortion compensation coefficients for updating the distortion compensation coefficients, based on the error signal; a saturation processor that performs saturation processing for, when at least one of the prospective distortion compensation coefficients does not fall into a preset range corresponding to the at least one prospective distortion compensation, changing the at least one prospective distortion compensation coefficient to a value within the preset range; and a controller that controls the updating of the distortion compensation coefficients based on pieces of coefficient saturation information indicating whether or not the saturation processing is performed on the prospective distortion compensation coefficients.