无线通信中有记忆功率放大器的一种预失真方法  

A predistortion method for power amplifiers with memory in wireless communications

作　　者：金哲 宋执环[1] 何加铭[2] 

机构地区：[1]浙江大学信息科学与工程学院,浙江杭州310027 [2]宁波大学通信技术研究所,浙江宁波315211

出　　处：《电波科学学报》2008年第1期85-89,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(NO.60372026)

摘　　要：在WCDMA等宽带通信系统中,射频功率放大器记忆效应明显,传统的无记忆预失真技术无法达到理想的线性化效果。分析功放的记忆效应,并提出一种适合于有记忆射频功率放大器的预失真方法。该方法首先基于记忆多项式构造预失真器,然后采用间接学习结构设计预失真系统,并运用限定记忆递推最小二乘算法更新预失真器参数,以跟踪放大器特性的变化。仿真结果表明,该方法能较好地补偿射频功放的非线性失真和记忆效应。In broadband communication systems, such as WCDMA, memory effects of RF power amplifiers（PAs）are significant and memoryless predistortion techniques cannot linearize PAs effectively. In this paper, PA memory effects are investigated and a predistortion method is proposed for the linearization of RF PAs with memory effects. The predistorter is constructed based on memory polynomial. The indirect learning architecture is adopted to design the predistortion system and the recursive least squares algorithm with a sliding rectangular window is applied to identify the predistorter. Therefore, the linearization system can track variation of the PA characteristics. Simulation results show that the proposed method can effectively compensate the nonlinear distortion and memory effects of RF PAs.

关 键 词：射频功率放大器 记忆效应 预失真 记忆多项式 线性化 

分 类 号：TN929.5[电子电信—通信与信息系统]