基于反馈迭代的双带功率放大器数字预失真

摘要

为补偿双带功率放大器中的非线性,提出了二维多项式模型并结合反馈迭代法建立数字预失真系统.相比于传统的线性化技术,二维数字预失真方法降低了对数/模转换器和模/数转换器的要求.仿真结果表明,采用间隔频率为100 MHz的两路WCDMA信号同时驱动功率放大器,二维多项式模型能够更好地消除非线性失真,反馈迭代方法在求逆上更精确.%This paper presents a 2D digital predistortion(2D-DPD) technique combined with the feedback iteration method that is applied to linearization of concurrent dual-band power amplifier.Compared with conventional linearization techniques,this 2D-DPD method reduces the requirement for the digital-to-analog and analog-to-digital converter device.This simulation results show that using two modulated wideband code-division multiple-access signals (WCDMA)at the same time,separated the frequency by 100 MHz,two-dimensional polynomial model can better eliminate the nonlinear distortion and feedback iteration method used on the inverse is more accurate.