基于放大器非线性拟合的自适应预失真技术

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。

Adaptive predistortion technology based on approximating the nonlinearity of HPA''''s characteristic

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 HPAs 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.