非线性信道的LMS Newton均衡算法的研究  

A study of LMS Newton equalization algorithm in nonlinear channel

作　　者：刘顺兰[1] 蒋树南[1] 

机构地区：[1]杭州电子科技大学通信工程学院,浙江杭州310018

出　　处：《电路与系统学报》2011年第1期108-115,共8页Journal of Circuits and Systems

基　　金：通信系统信息控制技术国家级重点实验室基金资助项目(060406016)

摘　　要：本文使用Hammerstein模型和维纳模型代替Volterra级数模型来模拟非线性结构以降低运算复杂度,提出了一个由Hammerstein模型和维纳模型构建成的非线性信道传输系统的模型,由此模型给出并推导出了基于该信道模型的NCLMS算法、改进1型NCLMS Newton算法和改进2型NCLMS Newton算法。仿真结果表明,NCLMS算法收敛速度慢且性能不稳定;改进1型NCLMS Newton算法克服了NCLMS算法收敛速度慢的缺点并提高了算法的稳定性;改进2型NCLMS Newton算法在继承了改进1型NCLMS Newton算法的优点之上进一步提高了算法的收敛速度,逼近理想NCLMS Newton算法。In this paper, we use Hammerstein model and Wiener model in non-linear structure instead of the Volterra series model in order to reduce the computational complexity, and propose a nonlinear transmission system model constructed by Hammerstein model and Wiener model. Based on the proposed system model, Nonlinear Channel LMS（NCLMS） algorithm, improved algorithm for type 1 NCLMS Newton and improved algorithm for type 2 NCLMS Newton are proposed and derived. The simulation results show that NCLMS algorithm has slow convergence and instable performance, improved algorithm for type 1 NCLMS Newton overcomes the NCLMS algorithm＇s shortcomings of slow convergence and improves the stability of the algorithm, improved algorithm for type 2 NCLMS Newton inherits the virtues of improved algorithm for type 1 NCLMS Newton and further improve the convergence speed, which is close to ideal NCLMS Newton algorithm.

关 键 词：非线性信道 HAMMERSTEIN模型 维纳模型 牛顿算法 LMS算法 

分 类 号：TN911.5[电子电信—通信与信息系统]