中文摘要：

为了提高通信系统中功率有效性和频谱利用率,在采用预失真技术克服功率放大器（PA）的非线性失真和采用多项式模型逼近功放模型的理论基础上,分析了多项式有效阶和输出功率回退（OBO）对预失真器补偿性能的影响,并进行仿真,提出预失真建模方向,对于提高功放效率,降低系统成本,推动节能减排具有一定的实际意义。

英文摘要：

In order to improve power effectiveness and spectrum utilization rate in communication system,thepredistortion technique is applied to overcome the nonlinearity of power amplifiers（PA）,and the polynomial series model is proposed to linearize PA.The influence of polynomial order and output backoff（OBO） on the performance of the predistorter is analyzed and the conclusion is simulated.It has actual significance.