Patent ID: 7991073

Claim:
A distortion compensation apparatus, comprising: a distortion compensation unit that performs distortion compensation processing on a transmission signal by a series operation; a coefficient update unit that updates a group of series operation coefficients used for the series operation based on a feedback signal of transmission signal output that is output after power amplification processing is performed on output of the distortion compensation unit and the transmission signal; an initial coefficient memory that stores one or more groups of initial values for coefficient update processing by the coefficient update unit, the one or more groups of initial values relating to one or more groups of series operation coefficients used for the distortion compensation processing; and a power fluctuation detection unit that detects a power fluctuation of the transmission signal and, when the power fluctuation is detected, reads one of the one or more groups of initial values from the initial coefficient memory and provides the one of the one or more groups of initial values to the coefficient update unit.