Patent ID: 8351878

Claim:
A radio apparatus comprising: a power amplifier that amplifies a power of an input signal; a storage unit that stores a distortion correction coefficient for correcting distortion occurring in the power amplifier, the distortion correction coefficient being stored in association with a predetermined power range of the input signal; a distortion corrector that acquires a distortion correction coefficient corresponding to the power of the input signal from the storage unit and performs a distortion correction process on the input signal using the acquired distortion correction coefficient; an arithmetic operator that calculates a distortion correction coefficient according to the input signal and an output signal output from the power amplifier; a comparator that compares a first threshold with the distortion correction coefficient obtained by the arithmetic operator, the first threshold being the maximum distortion correction coefficient that ensures predetermined quality with respect to an input signal having the minimum power in a power range regarding which the maximum difference between expected values of a distortion correction coefficient corresponding to each signal within the power range is equal to or larger than a predetermined value; and an update unit that updates the distortion correction coefficient stored in the storage unit and corresponding to the input signal to the first threshold, when the distortion correction coefficient obtained by the arithmetic operator is larger than the first threshold as a result of the comparing by the comparator.