Transmitter linearized using inversing and non-inversing transform processing sections and method therefor

Abstract

A transmitter () includes a nonlinear predistorter () having two instances of an inverting transform (') that may be implemented in a look-up table () and that implements a transform which is the inverse of an average terms component () of a nonlinear transform model () for an amplifier (). The look-up table () may be updated using a continuous process control loop that avoids Cartesian to polar coordinate conversions. One of the two instances of the inverting transform () is cascaded with a non-inversing transform () within a residual cancellation section () of the predistorter (). The non-inversing transform () implements a transform which is an estimate of a deviation terms component () of the nonlinear transform model (). The residual cancellation section () produces a weak signal that replaces an unwanted residual term in an amplified communication signal () with a much weaker residual term.