DISTORTION COMPENSATION DEVICE AND DISTORTION COMPENSATION METHOD

摘要

A distortion-compensation-coefficient storage unit (33) stores a distortion compensation coefficient. An address generating unit (31) takes a logarithm of power of an input signal, and exponentiates the value obtained by taking a logarithm, and selects a distortion compensation coefficient stored in the distortion-compensation-coefficient storage unit (33) according to the value obtained by exponentiation. A pre-distortion unit (32) acquires the selected distortion compensation coefficient from the distortion-compensation-coefficient storage unit (33), and perform distortion compensation processing on the signal input to the address generating unit (31) using the acquire distortion compensation coefficient. An amplifier amplifies the signal subjected to the distortion compensation processing. The distortion-compensation-coefficient calculating unit (34) updates a distortion compensation coefficient that is stored in the distortion-compensation-coefficient storage unit (33) based on an amplified transmission signal and a signal input to the address generating unit (31).