基于子带分解和比例归一化算法的回声消除器设计与仿真  

Design and simulation of echo canceller based on sub-band decomposition and proportionate NLMS algorithm

作　　者：徐丽[1] 巨永锋[2] 

机构地区：[1]长安大学信息工程学院,陕西西安710064 [2]长安大学电子与控制工程学院,陕西西安710064

出　　处：《电子设计工程》2012年第9期4-6,共3页Electronic Design Engineering

基　　金：中央高校基本科研业务费专项基金资助(CHD2011JC125)

摘　　要：针对稀疏信道条件下的网络回声抵消问题,提出了一种比例归一化子带自适应滤波算法。该算法基于子带分解结构,并利用网络中回声路径的稀疏特性,使得各个系数的步长与该系数的绝对值成比例,加快了活动系数的收敛速度,从而改善了子带分解算法在稀疏信道条件下的性能。仿真结果表明:将所提算法应用于网络回声消除器,能够获得很快的收敛速度和很低的稳态失调。To improve convergence speed of adaptive algorithm for network echo cancellation applications in sparse circumstance, a proportionate step-size adaptation algorithm based on sub-band decomposition structure is proposed. This presented algorithm exploits structure characteristic of sparse impulse response and updates each coefficient in the weight vector proportionate to its magnitude by selecting a proportionate matrix at per iteration. The new algorithms can achieve much faster convergence rate in sparse impulse responses than the original sub-band adaptive algorithm. Simulation results indicate that the algorithm demonstrates good performance for network echo cancellation.

关 键 词：稀疏信道 子带自适应滤波器 稀疏冲激响应 回声消除 稳态失调 

分 类 号：TP302.7[自动化与计算机技术—计算机系统结构]