结合辅助分离系统的变步长盲源分离算法  

Variable Step-Size Blind Source Separation Algorithm with an Auxiliary Separation System

作　　者：欧世峰[1,2] 赵晓晖[2] 高颖[1] 

机构地区：[1]烟台大学光电信息科学技术学院,山东烟台264005 [2]吉林大学通信工程学院信息科学实验室,吉林长春130012

出　　处：《电子学报》2009年第7期1588-1593,共6页Acta Electronica Sinica

摘　　要：针对盲源分离算法中步长因子的自适应选取问题,本文基于分离性能指标与步长因子的对应关系,提出了一种新的变步长盲源分离算法.该算法通过结合一个受限的辅助分离系统,重新构造系统分离性能指标,并根据该指标参数呈指数趋势下降的变化规律来获取步长因子的自适应更新.平稳和非平稳环境下的仿真实验表明:相对于固定步长和新近的自适应变步长算法,本文提出的算法拥有更快的收敛速度和更小的稳态误差.In view of the adaptive selection of step-size factor in sequential blind source separation,a novel variable step-size algoritthm is presented based on the correspondence between separating performance index and step-size. The proposed algorithm restructures the performance index by adopting an auxiliary separation system with some restriction and attains the adaptive updating rule of step-size in the light of the index descending in an exponential form. Simulation results show that the convergence and steady-state performance of the proposed method outperforms the fixed step-size and the recently proposed adaptive step-size algorithms in both stationary and non-stationary environments.

关 键 词：盲源分离 辅助系统 自适应变步长 收敛性 

分 类 号：TN911.7[电子电信—通信与信息系统]