基于指数函数的变步长仿射投影符号算法  

Variable Step Size Affine Projection Sign Algorithm based on Exponential Function

作　　者：李雪蕊 林云[1] LI Xue-rui;LIN Yun(School of Communication and Information Engineering,Chongqing University of Posts and Telecoiranunications,Chongqing 400065,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065

出　　处：《通信技术》2019年第2期286-290,共5页Communications Technology

摘　　要：现有的变步长仿射投影符号算法(Variable Step Size Affine Projection Sign Algorithm,VSS-APSA)收敛速度缓慢,在非稳定环境下性能严重衰减。为了解决这些问题,提出了一种基于指数函数的变步长仿射投影符号算法。通过使用修改后的误差函数作为步长函数,利用无噪先验误差的功率与步长的非线性关系对步长值进行迭代更新。仿真实验结果证明,与传统的变步长仿射投影符号算法相比,提出的算法具有更快的收敛速度、更小的稳态误差以及更高的稳定性。The existing VSS-APS A(Variable Step Size Affine Projection Sign Algorithm)has a slow convergence rate and would severely degrade in an unstable environment.In order to solve these problems,a new VSS-APS A based on exponential function is proposed.By using the modified error function as step-size function,the step size is updated by the non-linear relationship between the power of noise-free priori estimation error and the step size.The simulation results indicate that as compared with the conventional VSS-APS A,the proposed algorithm has faster convergence rate,lower steady-state error and more stable performance.

关 键 词：自适应滤波 仿射投影符号算法 变步长 误差函数 冲激噪声 

分 类 号：TN911.72[电子电信—通信与信息系统]