Systems and methods for signal predistortion

摘要

A single or multistage signal predistorter includes an input coupled to receive an information signal comprising input samples and an output coupled to the high power amplifier, the signal predistorter configured to receive an input sample, generate a distortion sample based on an estimate of nonlinearity of the high power amplifier at an operating saturation level, modify the input sample with a correction term to generate a predistortion signal, wherein the correction term is proportional to the distortion sample, and further wherein the predistortion signal comprises the information signal modified to account for nonlinearities in the high power amplifier.

主权项

1. A communication system, comprising a plurality of channels, each channel having a corresponding signal input, and each channel further comprising:
a high power amplifier comprising an input and an output; and a signal predistorter comprising an input coupled to receive an information signal comprising input samples and an output coupled to the high power amplifier, the signal predistorter configured to receive an input sample, generate a distortion sample based on an estimate of nonlinearity of the high power amplifier at an operating saturation level, modify the input sample with a correction term to generate a predistortion signal, wherein the correction term is proportional to the distortion sample, and further wherein the predistortion signal comprises the information signal modified to account for nonlinearities in the high power amplifier, wherein the signal predistorter is a multistage signal predistorter, wherein the proportionality of the correction term to the distortion sample is based on a convergence factor, and the convergence factor decreases at each subsequent stage of the multistage signal predistorter.