Patent ID: 7280611

Claim:
A nonlinear distortion compensating device comprising: a distortion compensating calculator operable to receive an input signal and a distortion compensating coefficient so that said distortion compensating coefficient is a stored distortion compensating coefficient, and output the input signal with phase distortion and amplitude distortion compensated; a demodulator operable to demodulate the input signal and output a demodulated signal; a modulator operable to receive the demodulated signal output from the demodulator, modulate the demodulated signal, and output a modulated signal; and a distortion estimating updater operable to feed back parts of the signal output from the distortion compensating calculator as a fed back signal, estimate an estimated distortion amount from the fed back signal and the modulated signal output by the modulator, and update the distortion compensating coefficient stored in the distortion compensating calculator based on the estimated distortion amount.