The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 04, 2003
Filed:
Aug. 15, 2002
Abstract
A piecewise polynomial predistortion method and apparatus compensates nonlinear distortion of a high power amplifier by including an amplitude predistortion circuit for predistorting an input amplitude signal based on first polynomial coefficients corresponding to the amplitude of the input amplitude signal to provide a predistorted amplitude signal, a phase predistortion circuit for predistorting an input phase signal based on the predistorted amplitude signal and second polynomial coefficients corresponding to the amplitude of the predistorted amplitude signal to provide a predistorted phase signal, a power amplifier for amplifying the predistorted amplitude and phase signal to output an amplified amplitude and phase signal, a first adaptation circuit for updating the first polynomial coefficients based on the predistorted amplitude signal and the amplified amplitude signal and a second adaptation circuit for updating the second polynomial coefficients based on the predistorted amplitude signal, the predistorted phase signal and the amplified phase signal.