正交小波变换和时间分集联合盲均衡算法  

The orthogonal wavelet transform and time diversity combined blind equalization algorithm

作　　者：郭业才[1] 丁雪洁[1] 

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

出　　处：《南京信息工程大学学报（自然科学版）》2010年第1期1-5,共5页Journal of Nanjing University of Information Science & Technology（Natural Science Edition）

基　　金：全国优秀博士学位论文作者专项资金(200753);江苏省高校自然科学基金(08KJB510010;07KJB510068);江苏省"六大人才高峰"培养对象资助;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：为了克服水声信道多径效应及常数模算法的缺陷,将时间分集技术应用于盲均衡算法中以减小多径效应对信号传输的影响,利用双曲正切误差函数代替常模误差函数,以减小均方误差,并以软切换的方式与判决引导(DD)算法相结合,同时引入数字锁相环共同纠正多普勒效应引起的相位旋转.为加快算法的收敛速度,对输入信号进行正交小波变换以减小输入信号的自相关性,从而提出一种正交小波变换和时间分集技术联合盲均衡算法(WT-CTDE).水声信道仿真结果验证了该算法的有效性.To overcome the defects of multi-path underwater acoustic channel and Constant Modulus Algorithm （CMA） ,the orthogonal wavelet transform and time diversity combined blind equalization algorithm is proposed. In this proposed algorithm, time diversity is applied to blind equalizer to reduce fading effect, and the mean square er- ror is decreased by using hyperbolic tangent error function instead of constant modulus error function and combining it with the decision directed （DD） algorithm in the manner of soft transform. The phase-locked loop is introduced to correct its phase rotation caused by the Doppler effect, and orthogonal wavelet transform is utilized to reduce the self-correlation of the input signal in order to improve the algorithm＇s convergence rate. The effectiveness of the proposed algorithm is best proved by the simulation in underwater acoustic channel.

关 键 词：时间分集 正交小波变换 双曲正切误差函数 判决引导算法 数字锁相环 

分 类 号：TN911.7[电子电信—通信与信息系统]