基于简化VOLTERRA级数的数字预失真系统设计方法

摘要

提出了一种基于Volterra级数的功放模型辨识简化方法,并设计了相应的数字预失真器,进行了MATLAB仿真。最后,搭建半实物的预失真平台验证基于Volterra级数的数字预失真器的线性化程度。实验得出功率放大器输出功率为40 dBm时,改善输出信号的ACPR（邻信道功率比）达15 dB以上,设计的数字预失真模块对功放的线性度改善效果明显。%Designes a digital predistortion system based on a simplified identification method using Volterra series.And uses the simulation of MATLAB to evaluate the performance of the system.Finally a hardware-in-loop simulation of the predistortion system is operated for validating the characteristics.The results indicate that the ACPR is improved by 15dB when output power is 40 dBm.In a word,the linearity of the power is improved by this adapted predistorter.