基于正交小波包变换的判决反馈盲均衡算法  

Decision Feedback Blind Equalization Algorithm Based on Orthogonal Wavelet Packet Transform

作　　者：郭业才[1,2] 杨超[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》2010年第3期570-572,共3页Journal of System Simulation

基　　金：全国博士论文作者专项基金(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);江苏省自然科学基金(BK2009410);南京信息工程大学科研机构和创新团队(2009)(JG0803;TD0810)

摘　　要：针对严重线性失真的水声信道,在分析正交小波包变换理论和判决反馈盲均衡算法的基础上,利用正交小波包变换良好的去相关性特性,对判决反馈盲均衡算法的前馈滤波器权向量进行修正,提出了基于正交小波包变换的判决反馈盲均衡算法(WPT-DFE)。与基于正交小波变换的判决反馈盲均衡算法(WT-DFE)和常规判决反馈盲均衡算法(CMA-DFE)相比,该算法具有收敛速度快、跟踪性能好、稳态误差小的特点。水声信道的仿真结果,验证了算法的有效性。For overcoming effect of the underwater acoustic channel on communication quality, orthogonal Wavelet Packet Transform based Decision Feedback blind Equalization algorithm （WPT-DFE） was proposed, on the basis of analyzing orthogonal wavelet packet transform theory and the feature of decision feedback blind equalization algorithm. In this proposed WPT-DFE algorithm, correlativity of signals is lowed by orthogonal wavelet packet transform and iterative formula of forwardback weight vectors is modified by using orthogonal wavelet packet transform. The proposed WPT-DFE algorithm outperforms orthogonal Wavelet Transform based Decision Feedback blind Equalization algorithm （WT-DFE） and traditional Decision Feedback blind Equalization algorithm based on Constant Modulus Algorithm （CMA-DFE） in convergent rate, tracking performance, and Mean Square Error （MSE）. The efficiency of the proposed WPT-DFE algorithm is proved by computer simulation with underwater acoustic channels.

关 键 词：正交小波包变换 判决反馈 盲均衡 水声信道 

分 类 号：TN991[电子电信—信号与信息处理]