功放数字基带预失真理论分析和仿真实现  

Theoretical Analysis and Simulation Implementation of Adaptive Digital Baseband Predistortion for PA

作　　者：南敬昌[1,2] 李新春[1] 刘元安[3] 唐碧华[3] 

机构地区：[1]辽宁工程技术大学电子与信息工程学院 [2]北京邮电大学,北京100876 [3]北京邮电大学

出　　处：《系统仿真学报》2008年第12期3220-3222,3228,共4页Journal of System Simulation

基　　金：国家自然科学基金资助项目(60573111);高等学校博士学科点专项科研基金资助(20030013010)

摘　　要：为了消除功放非线性带来的失真,满足制定的功率谱密度要求,自适应数字基带预失真技术以其良好的线性度、宽带宽、高效率和全自适应性等优点而成为消除功放失真的首选。从几种线性化技术的比较开始,介绍了两种数字预失真结构,给出了数字基带预失真的工作原理,构建了数字基带预失真电路并在ADS环境下实现了系统级仿真。仿真结果表明构建的数字基带预失真系统能够获得好的预失真效果,功率谱密度的最大改善能够达到30dBm。创建的系统级仿真电路对实际的数字预失真系统设计起着重要的指导作用。In order to cancel nonlinear distortion of power amplifier （PA） and meet the requirement of power spectral density mask specified by regulatory bodies, an adaptive digital baseband predistortion technique have been applied because of many advantages such as good linearity, wide bandwidth, high efficiency and full adaptation and become first choice of canceling distortion of nonlinear PA. Starting from comparison with a few linearization techniques, two kinds of digital predistortion structures were introduced, and operating theory of digital baseband predistortion was given, and digital baseband predistortion circuits and implement system-level simulation in ADS circumstance were built. Simulation result shows that created digital baseband predistortion system can obtain good predistortion effect. The created system-level simulation circuit plays an important role in designing practical predistorter.

关 键 词：数字基带预失真 自适应 仿真 功率放大器 先进设计系统 

分 类 号：TN722.75[电子电信—电路与系统] TN830.6