Patent ID: 8355466

Claim:
A method for reducing power amplifier induced distortion, comprising: receiving a received signal corresponding to a channel affected version of a transmitted signal, wherein the transmitted signal comprises transmit data that was distorted by a transmit power amplifier prior to transmission over the channel; iteratively estimating distortion induced by the transmit power amplifier prior to transmission in the received signal via an estimation routine to generate estimated power amplifier distortion; iteratively cancelling the estimated power amplifier distortion present in the received signal via a cancellation routine executed after each iteration of the estimation routine; comparing, after each iteration of the cancellation routine, a current estimated power amplifier distortion to a previous estimated power amplifier distortion to determine whether difference between the current estimated power amplifier distortion and the previous estimated power amplifier distortion is less than a convergence threshold; temporarily stopping the cancellation routine when the difference between the current estimated power amplifier distortion and the previous estimated power amplifier distortion is less than the convergence threshold; determining M-QAM constellation points corresponding to estimates of the transmit data, and determining particular ones of the M-QAM constellation points that are incorrectly estimated and in error; and executing, for each of the M-QAM constellation points, a M-QAM constellation point correction routine designed to move the incorrectly estimated M-QAM constellation points that are in error towards expected quadrants of those incorrectly estimated M-QAM constellation points.