Patent ID: 6836646
Filing Date: 2004-12-28
Classification: H03F,H04B,H04L

Abstract:
A method for compensating for non-linear distortion generated during non-linear high-power amplification in a transmitter after quadrature modulation, the transmitter having a distortion extractor for extracting a non-linear distortion component from a non-linearly high-power amplified modulated signal, a quadrature modulator for quadrature modulating the non-linear distortion component into a baseband distortion component after phase adjustment, and a distortion overlapping section for overlapping the baseband signal with a phase-inverted distortion component of the baseband distortion component, the method comprising the steps of:attenuating an output signal of the high-power amplifier by a gain of the high-power amplifier when the high-power amplifier generates an amplified signal, and extracting a non-linear distortion component by subtracting a phase-adjusted input signal of the high-power amplifier from the attenuated output signal; and converting the non-linear distortion component into a DC (Direct Current) component, and automatically controlling an attenuation of the output signal of the high-power amplifier to minimize the DC component.