Patent ID: 6236837
Filing Date: 2001-05-22
Classification: H03F,H04B,H04L

Abstract:
A device for providing predistortion for linearization in a radio frequency RF power amplifier, comprising:(A) a polynomial predistortion unit, coupled to receive an input baseband signal and updated polynomial coefficients, for predistorting the baseband signal to provide a predistorted baseband signal in accordance with the updated polynomial coefficients;(B) an RF modulator, coupled to the polynomial predistortion unit and to an RF generator, for modulating the predistorted baseband signal to provide an RF signal;(C) an RF power amplifier, coupled to the RF modulator and to a power supply, for amplifying the RF signal to provide an amplified RF signal;(D) an RF demodulator, coupled to receive the amplified RF signal, for demodulating the amplified RF signal to provide a demodulated baseband signal; and(E) a polynomial coefficient estimator, coupled to receive the predistorted baseband signal and the demodulated baseband signal, for estimating the polynomial coefficients using orthogonal polynomial basis functions and for providing the updated polynomial coefficients for the polynomial predistortion unit for substantially linearizing the amplified RF signal.