一种有效的水声信道盲均衡算法  

An Effective Blind Equalization Algorithm for Underwater Acoustic Channels

作　　者：宁小玲[1] 刘忠[1] 李朝旭[1] 夏清涛[1] 

机构地区：[1]海军工程大学电子工程学院,武汉430033

出　　处：《武汉理工大学学报（交通科学与工程版）》2012年第1期171-175,共5页Journal of Wuhan University of Technology（Transportation Science & Engineering）

基　　金：国家863计划项目(批准号:2007AA01Z309);国防预研基金项目资助

摘　　要：针对超指数迭代判决反馈盲均衡(SEIDFE)算法在水声通信系统中表现出的收敛性差的问题,提出了一种稳健性好、收敛快的双模式超指数迭代判决反馈盲均衡算法.该算法对均衡器输出的实部和虚部分别进行非线性变换以修正误差控制信号,从而纠正载波相位旋转;在此基础上,将一种新的自适应变步长算法应用到前馈滤波器前向权值的迭代步长中,提高算法收敛速度;并采取判决误差切换准则,将上述改进算法与判决导引算法有机结合起来,提高算法稳健性和收敛性能.仿真结果证明了该算法的有效性.In order to overcome the ill convergence performance of super-exponential iteration decision feedback algorithm（SEIDFE） in underwater acoustic communication system,a robust dual-mode super-exponential iteration decision feedback blind equalization algorithm with the fast convergence speed is proposed.The non-linear transformation for the real part and imaginary part of equalization output is carried out by the presented algorithm to modify error control signal,so as to correct the deviation of carrier wave phase.Then,a new adaptive variable size step algorithm is introduced in the iteration size step of the weights in feed-forward filter,increasing the convergence speed of algorithm.Furthermore,the improved algorithm and decision directed algorithm are combined based on judgment error switching criterion to improve the robustness and convergence performance.The simulation results demonstrate that the effectiveness of new algorithm.

关 键 词：水声信道 盲均衡 超指数迭代 判决反馈 变步长 判决导引 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]