Patent ID: 7289776

Claim:
A transmission device comprising: a non-linear distortion compensating section for compensating non-linear distortion of an orthogonal base-band signal that is digitally modulated to form a distortion compensated signal by using non-linear distortion compensating data; a first orthogonal modulator for orthogonally modulating the distortion compensated signal received from the non-linear distortion compensating section; a modulation signal distributor for distributing a feedback signal formed by amplifying the distortion compensated signal orthogonally modulated by the first orthogonal modulator; a phase/amplitude control section for controlling a phase and an amplitude of at least one of 1) the feedback signal distributed by the modulation signal distributor and 2) a reference signal based on the input orthogonal base-band signal; a signal combiner for generating a combinatory signal based on the feedback signal and the reference signal, at least one of the feedback signal and the reference signal that are provided to the signal combiner being phase and amplitude controlled by the phase/amplitude control section; and an updating section for updating the non-linear distortion compensating data based on the input orthogonal base-band signal and the combinatory signal provided by the signal combiner, the combinatory signal being analog-digital converted prior to being received by the updating section, wherein the phase/amplitude control section controls the phase and the amplitude of the feedback signal, and the reference signal is generated by a second orthogonal modulator by orthogonally modulating the input orthogonal base-band signal, wherein the updating section updates the non-linear distortion compensating data by using the input orthogonal base-band signal and a demodulated signal obtained by an orthogonal demodulator which one of 1) orthogonally demodulates the analog-digital converted combinatory signal and 2) provides the combinatory signal with analog-digital conversion and orthogonally demodulates the combinatory signal.