Patent ID: 6567478
Filing Date: 2003-05-20
Classification: H03F,H04B,H04J,H04L,H04W

Abstract:
A radio apparatus for compensating for non-linear distortion of a transmission power amplifier, characterized by having:a first DA converter for converting a transmit signal to an analog signal and outputting the analog transmit signal; a transmission power amplifier for amplifying and transmitting the transmit signal; branching means for branching part of an output signal of said transmission power amplifier; an AD converter for converting, to a digital signal, the output signal of the transmission power amplifier branched by the branching means or a signal obtained by subjecting this output signal to predetermined processing, and outputting the digital signal as a feedback signal; an error estimating arithmetic unit for estimating and outputting an error signal, which is ascribable to non-linear distortion of the amplifier, using the feedback signal and a reference signal, which is the transmit signal; a second DA converter for converting said error signal to an analog signal and outputting the analog signal; and a combiner for combining, and outputting to the transmission power amplifier, the transmit signal converted to the analog signal by the first DA converter and the error signal converted to the analog signal by the second DA converter.