Based on the narrow communication systems and disregarding memory effects,the paper describes an adaptive digital predistortion method which can restrain the noise effect caused by applications.

The principle of adaptive digital predistortion is introduced Secondly,the memoryless and memory models of power amplifier and two practical methods of predistortion which are look-up table based method and polynomial based method are introduced.

Because the high power amplifier of the base station is commonnly operated with digital predistortion (DPD), we introduce the principle and structure of DPD and research the operation of them.

So, digital pre-distortion technology (DPD) has also become a hot research topic.

Two kinds of typical DPD(Digital Pre-Distortion) methods are presented in the paper,which are Polynomial Estimation and LUT(look up table).

This paper introduces some structures and algorithms of Digital Predistortion(DPD) at first.

In order to cancel nonlinear distortion of power amplifier (PA) and meet the requirement of power spectral density mask specified by regulatory bodies, an adaptive digital baseband predistortion technique have been applied because of many advantages such as good linearity, wide bandwidth, high efficiency and full adaptation and become first choice of canceling distortion of nonlinear PA.