Nonlinear characteristics and pre distortion modeling of a non memory RF power amplifier

Abstract

Power amplifier is an important component of wireless communication transmitter, the nonlinear distortion of the RF power amplifier leads to a new frequency component, thereby causing interference to the transmitted signal, Cause signal distortion and increase of receiver error rate. Therefore, it is necessary to eliminate the nonlinear effects of the amplifier as much as possible. This paper mainly focuses on the power amplifier power amplifier output signal with respect to the nonlinear input signal possible distortion phenomenon research, construct a memory less predistortion mathematical model based on polynomial, the amplifier signal pre distortion compensation processing. And on the basis of the use of matlab programming to input and output data memory model of the pre distortion compensation processing, the negative impact of the predistortion model processing method can interfere with the power amplifier nonlinear about adjacent channel consumption significantly, significantly improve the linearity of the power amplifier.