Amplifier Digital Adaptive Pre-distortion System,

The topic of this thesis is the linearization technology of microwave power amplifier. This paper concerns in the rejection of adjacent channel interference (ACI) in communication system due to the nonlinear distortions of the power amplifier.With the development of wireless communication, microwave power amplifier plays the very important role. It is used in the end of transmitter, and is the most valuable part. In order to improve output power and efficiency, power amplifier always works in the saturated state, which will produce severe non-linear distortion. And the distortion is enhanced by transistor degradation, temperature changes, channel switching and power supply variations.Linearization of microwave power amplifier can solve this problem effectively. It will get a good linearization when the performances of output power and efficiency are both good. There are some ways such as feedforward, feedback predistortion and LINC in common use. Based on development of DSP technology, the adaptive technology is developed to solve it.This paper analyses all kinds of linearization technologies, and introduces digital adaptive predistortion technology based on researching the characters of power amplifier adequately. This paper involves three parts: 1) Introduction and analysis of algorithms. 2) Hardware system. 3) Software system. 4) Debug together. The end of this paper is conclusion from the project and gives some suggestions for later work.