一种新的变步长LMS自适应滤波算法  

A New Variable Step Size LMS Adaptive Filtering Algorithm

作　　者：周学文[1] 柯熙政[1] 

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《西安理工大学学报》2006年第3期290-293,共4页Journal of Xi'an University of Technology

基　　金：陕西省"火炬计划"资助项目(2002KH52);陕西省教育厅专项科研基金资助项目(04JK247)

摘　　要：对变步长自适应滤波算法进行了讨论,提出了一种新的变步长LMS算法。新算法用误差信号的自相关及均方误差的时域平均来调节自适应滤波算法的步长。由于不需要指数运算,新算法的运算量大大降低,收敛速度快,且消除了不相关噪声的干扰。将该算法用于码间干扰比较严重的大气激光通信系统中,仿真结果验证了算法的优越性。Based on adaptive filtering algorithm with variable step size, this paper presents a new variable-step-size LMS algorithm, which uses the estimation of the autocorrelation about error signal and time-average of mean square error to adjust the step of adaptive algorithm. The quantity of the new algorithm＇s operation is reduced greatly, and the speed of convergence is quickened, as the new algorithm doesn＇t need operation of exponent. At the same time, the new algorithm eliminates the interference of uncorrelated noise. The new algorithm can be applied in laser communication system in atmosphere with quite serious inter-symbol interference. Simulation results validate the superiority of the new algorithm.

关 键 词：变步长LMS 自适应 滤波器 激光通信 

分 类 号：TN911.72[电子电信—通信与信息系统]