功放预失真中自适应算法研究  

Study of Different Modulation Methods on Digital Pre-distortion in Satellite Communication Systems

作　　者：韩冰[1] 晋东立[1] 

机构地区：[1]北京跟踪与通信技术研究所,北京100094

出　　处：《无线电通信技术》2015年第6期76-78,共3页Radio Communications Technology

摘　　要：数字基带预失真技术是补偿功放非线性的最有效方法之一,而自适应算法的选择很大程度上影响着系统的预失真性能。其中,最小均方误差(LMS)算法和递归最小二乘法(RLS)是最常用的自适应收敛算法,LMS算法计算复杂度较低,但LMS算法收敛速度慢,易陷入局部最优且精度不高,RLS收敛性能较好,但计算复杂度高。在综合分析2种算法优缺点的基础上,提出了一种LMS和RLS算法的组合算法,仿真结果表明,组合算法的预失真性能很好,而且算法复杂度较低。Digital pre-distortion is one of the most efficient ways to compensate power amplifier＇ s nonlinearity. And the choice of adaptive algorithm influences the system pre-distortion performance to some extent.LMS and RLS are frequently-used adaptive conver- gence algorithms.On the base of analyzing the advantage and disadvantage of the two methods, this paper presents a new algorithm, which combines LMS and RLS.Simulation results demonstrate that the new algorithm promotes system pre-distortion performance and lowers the system computational complexity.

关 键 词：功率放大器 数字预失真 LMS RLS变步长 

分 类 号：TN722[电子电信—电路与系统]