APPARATUS AND METHOD FOR AMPLITUDE VARIATION REDUCTION OF A SIGNAL

摘要

A transmitter comprises a base band modulator (101) for generating a complex base band signal to be amplified by a power amplifier (103). The complex base band signal is fed to a first limiter (107) which generates a limited signal by limiting the complex base band signal by independently limiting the first real component and the first imaginary component. A first phase rotator (109) then phase rotates the limited signal by a first phase value to generate a phase rotated signal having a second real component and a second imaginary component. The phase rotated signal is then limited by a second limiter (111) by an independent limiting of the second real and second imaginary components. The double limited signal is then optionally phase rotated in a second phase rotator (113) to compensate for the initial phase rotation. The invention may allow improved amplitude limitation with low complexity.