Patent ID: 7856069

Claim:
A distortion compensation apparatus comprising: an amplifier amplifying an input signal; a calculation unit obtaining a distortion compensation coefficient of the amplifier corresponding to an amplitude level of the input signal, based on the input signal input to the amplifier and an output signal output from the amplifier; a memory storing the distortion compensation coefficient obtained by the calculation unit into a write address being made to correspond to the input signal amplitude level; a distortion compensation processing unit reading out the distortion compensation coefficient from the readout address of the memory, and performing distortion compensation processing of the input signal using the distortion compensation coefficient; and an address generator generating the write address and the readout address, based on the input signal amplitude level, wherein the address generator decides a first address obtained based on a first input signal amplitude level as write address, and a second address corresponding to a second input signal amplitude level which is close to the first input signal amplitude level as readout address.