基于正交小波包变换的变步长双模式盲均衡算法  

Variable Step-size Dual-mode Blind Equalization Algorithm Based on Orthogonal Wavelet Packet Transform

作　　者：郭业才[1,2] 纪娟娟[2] 

机构地区：[1]南京信息工程大学电子与信息工程学院,南京210044 [2]安徽理工大学电气与信息工程学院,淮南232001

出　　处：《系统仿真学报》2011年第2期335-338,345,共5页Journal of System Simulation

基　　金：江苏省自然科学基金(BK2009410);全国博士论文作者专项基资金(200753);江苏省高等学校自然科学基金(08KJB510010);江苏省"六大人才高峰"培养对象资助(2008026);安徽省省高等学校自然科学基金(KJ2010A096);南京信息工程大学科研机构和创新团队(2009)(JG0803;TD0810)

摘　　要：在分析正交小波包变换盲均衡算法特性的基础上,提出一种基于正交小波包变换的变步长双模式盲均衡算法(WPT-VDMA)。该算法利用正交小波包变换良好的去相关性和变步长,来加快收敛速度;利用符号判决实现基于正交小波包变换的常数模盲均衡算法(WPT-CMA)与基于正交小波包变换的判决导引盲均衡算法(WPT-DD)间的切换,以减小均方误差。仿真结果表明,与WPT-CMA和WPT-DMA(基于正交小波包变换的双模式盲均衡算法)相比,WPT-VDMA收敛后的均方误差分别减少约3.1dB和2.2dB,收敛速度分别快约6500步和3000步。因此,该算法具有收敛速度快、跟踪性能好、均方误差小的特点。On the basis of analyzing of Wavelet Packet Transform based on CMA（WPT-CMA）,Orthogonal Wavelet Packet Transform based Variable step-size Dual-Mode blind equalization Algorithm（WPT-VDMA） was proposed.The convergence rate of the proposed algorithm could be improved via using the better de-correlation of wavelet packet transform and defining a variable step-size function,and its mean square error could be reduced by switching between orthogonal Wavelet Packet Transform based Constant Modulus blind equalization Algorithm（WPT-CMA） and orthogonal Wavelet Packet Transform based Decision Directed blind equalization algorithm（WPT-DD） according to sign decision.Simulation results with underwater acoustic channels show that the WPT-VDMA has a drop of about 3.1dB and 2.2dB for the mean square error（MSE） and an improvement of about 6500 steps and 3000steps for the convergence rate comparison with the WPT-CMA and WPT-DMA（orthogonal Wavelet Packet Transform based Dual-Mode blind equalization Algorithm）.Accordingly,the proposed algorithm has faster convergence rate,better tracking performance,and less mean square error.

关 键 词：盲均衡 正交小波包变换 变步长 判决导引 水声信道 

分 类 号：TN911.72[电子电信—通信与信息系统]