一种星载功率放大器数字预失真方法  

Study on a Digital Pre-Distortion Method for Spaceborne Power Amplifier

作　　者：孙传新 胡勇 程丽君 刘敏 SUN Chuanxin;HU Yong;CHENG Lijun;LIU Min(No.29 Institute of CETC,Chengdu Sichuan 610036,China;No.30 Institute of CETC,Chengdu Sichuan 610041,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,四川成都610036 [2]中国电子科技集团公司第三十研究所,四川成都610041

出　　处：《通信技术》2023年第10期1228-1232,共5页Communications Technology

摘　　要：在卫星高速数传系统中,为了提高通信速率和频谱效率,M-QAM和M-QPSK等高阶调制方式被越来越多地采用,由此带来的功率放大器的非线性效应和记忆效应也日益严重,对通信系统性能造成很大影响。针对传统数字预失真算法收敛速度慢和计算复杂度大等问题,提出了一种基于快速横向滤波递推最小二乘(Fast Transversal Recursive Least Square,FTRLS)的参数提取算法,并对该算法进行了理论分析和性能仿真。仿真结果表明,与经典RLS算法相比,该算法具有稳态误差小、收敛速度快和计算复杂度低的优势以及更优良的功放线性化效果。In the satellite high-speed data transmission system,in order to improve the communication rate and spectral efficiency,high-order modulation methods such as M-QAM and M-QPSK are increasingly used,and the resulting nonlinear effects and memory effects of power amplifiers are also becoming more and more serious,which have a great impact on the performance of communication systems.To address the problems of slow convergence speed and large computational complexity of conventional digital pre-distortion algorithm,a parameter extraction algorithm based on fast lateral filtering(FTRLS)is proposed,and the algorithm is theoretically analyzed and simulated.Simulation results indicate that compared with the classical RLS algorithm,the algorithm has the advantages of small steady-state error,fast convergence speed and low computational complexity as well as better power amplifier linearization effect.

关 键 词：数字预失真 星载功率放大器 记忆多项式 FTRLS 

分 类 号：TN927[电子电信—通信与信息系统]