Non-Uniform Norm Constraint LMS Algorithm for Sparse System Identification
Non-Uniform Norm Constraint LMS Algorithm for Sparse System Identification
复制标题
稀疏系统辨识的非均匀范数约束LMS算法
DOI:
10.1109/lcomm.2013.011113.121586
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发表时间:
2013-01
期刊:
影响因子:
--
通讯作者:
Tong, F.
中科院分区:
文献类型:
--
作者:
Wu, F. Y.;Tong, F.
Sparsity property has long been exploited to improve the performance of least mean square (LMS) based identification of sparse systems, in the form of l0-norm or l1-norm constraint. However, there is a lack of theoretical investigations regarding the optimum norm constraint for specific system with different sparsity. This paper presents an approach by seeking the tradeoff between the sparsity exploitation effect of norm constraint and the estimation bias it produces, from which a novel algorithm is derived to modify the cost function of classic LMS algorithm with a non-uniform norm (p-norm like) penalty. This modification is equivalent to impose a sequence of l0-norm or l1-norm zero attraction elements on the iteration according to the relative value of each filter coefficient among all the entries. The superiorities of the proposed method including improved convergence rate as well as better tolerance upon different sparsity are demonstrated by numerical simulations.
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