基于放大器非线性拟合的自适应预失真技术

HWRD

杨文考周尚波朱维乐
电子科技大学 1603 教研室四川 成都 610054
摘 要本文提出了一种新的有效的大功率放大器非线性失真的数字自适应预失真设计方法该
方法基于有理双线性函数的非线性及其逆变换易于求解的特性设计大功率放大器的估计器以逼
近大功率放大器的非线性特性预失真器的非线性参数由估计器的逼近函数逐段取逆变换来调
节以达到预失真补偿的目的计算机仿真结果表明该方法用于正交频分复用OFDM 系统
中具有收敛速度快系统性能稳定补偿效果好等特点
关键词正交频分复用大功率放大器非线性失真自适应预失真有理函数
中图分类号TN830.6 文献标识码A 文章编号1000-436X(2002)10-0081-08
Adaptive predistortion technology based on approximating the
nonlinearity of HPA’s characteristic
YANG Wen-kao, ZHOU Shang-bo, ZHU Wei-le
1603 Reserch Studio, UEST of China, Chengdu 610054,China
Abstract: This paper presents an novel digital adaptive predistorting designing method compensating for
nonlinear distortions caused by a high-power amplifier (HPA). The method designs an estimator to
approximate the nonlinearity of HPA’s characteristic based on the characteristic and easy to obtain the
inverse of the reasonal bilinear function. To achieve the predistortion compensation, we adjust the
nonlinear parameters of the predistortor by the piecewise inverse function of the estimator. The result of
computer simulation shows that the method algorithm converges fast and robust and well effective
compensation in the orthogonal frequency division multiplexing(OFDM) system.
Key words: OFDM; HPA; nonlinear distortion; adaptive predistortion; reasonal function
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