基于大功率放大器估计器的自适应预失真技术

本文提出了一种用于正交频分复用（OFDM）系统中由大功率放大器引起的非线性失真的有效的数字自适应补偿方法。该方法是通过对大功率放大器的非线性特性进行分段估计,然后对其逐段取逆变换来调节大功率放大器的预失真器的非线性参数,以达到预失真补偿的目的。计算机仿真结果表明:该方法具有收敛速度快、需要动态存储器（RAM）少、补偿效果好等特点。

Adaptive Predistortion Technology Based on HPA Estimator

The paper presents an efficient digital adaptive method compensating for nonlinear distortions caused by a high-power amplifier (HPA) in orthogonal frequency division multiplexing(OFDM) system. Predistortion achieved by the method is by estimating HPA nonlinear characteristic by piecewise linear function and adjusting HPA estimator parameters via performing inverse transform section by section. The computer simulation shows that the method algorithm converges fast and RAM requires less and compensates effect well.