一种新的变步长LMS自适应滤波算法

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。

A New Variable Step Size LMS Adaptive Filtering Algorithm

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.