Patent ID: 6674808
Filing Date: 2004-01-06
Classification: H03F,H04L

Abstract:
A communication system comprising:a modulator for modulating a data stream onto a carrier wave to generate a modulated signal, the modulator converting data on the data stream into symbols for transmission by the transmission system; an amplifier for amplifying the modulated signal prior to transmission to generate an amplified signal, the amplifier including an amplifier filtering effect the distorts the modulated signal, wherein the modulated signal is also distorted by a pre-amplifier filtering effect; a predistorter, the predistorter receiving the modulated signal prior to amplification by the amplifier, the predistorter generating an inverse signal of the pre-amplifier filtering effect, the inverse signal varying the modulated signal to define a predistorted signal; an equalizer receiving a portion of the amplified signal, the equalizer removing he amplifier filtering effect and generating a equalized signal, the equalized signal being operable to vary generation of the inverse signals; an error estimator, the error estimator receiving the equalized signal and estimating a difference between the equalized signal and the modulated signal, defined as an error signal, the error signal having a phase error component and a magnitude error component; a predistorter tap update generator, the predistorter tap update generator generating a first signal for controlling operation of the predistorter in accordance with the phase error component output by the error estimator; and an equalizer tap update generator, the equalizer tap update generator generating a second signal for controlling operation of the equalizer in accordance with the magnitude error component output by the error estimator.