Performance Analysis of $l_0$ Norm Constraint Least Mean Square Algorithm

As one of the recently proposed algorithms for sparse system identification, l 0 norm constraint Least Mean Square ( l 0 -LMS) algorithm modifies the cost function of the traditional method with a penalty of tap-weight sparsity. The performance of l 0 -LMS is quite attractive compared with its vario...

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Bibliographic Details
Published in:IEEE transactions on signal processing 2012-05, Vol.60 (5), p.2223-2235
Main Authors: Su, Guolong, Jin, Jian, Gu, Yuantao, Wang, Jian
Format: Article
Language:English
Subjects:
Algorithms
Approximation
Convergence
Deviation
Gaussian
Least mean squares algorithm
Norms
Taylor series
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Summary:As one of the recently proposed algorithms for sparse system identification, l 0 norm constraint Least Mean Square ( l 0 -LMS) algorithm modifies the cost function of the traditional method with a penalty of tap-weight sparsity. The performance of l 0 -LMS is quite attractive compared with its various precursors. However, there has been no detailed study of its performance. This paper presents comprehensive theoretical performance analysis of l 0 -LMS for white Gaussian input data based on some reasonable assumptions, which are reasonable in a large range of parameter setting. Expressions for steady-state mean square deviation (MSD) are derived and discussed with respect to algorithm parameters and system sparsity. The parameter selection rule is established for achieving the best performance. Approximated with Taylor series, the instantaneous behavior is also derived. In addition, the relationship between l 0 -LMS and some previous arts and the sufficient conditions for l 0 -LMS to accelerate convergence are set up. Finally, all of the theoretical results are compared with simulations and are shown to agree well in a wide range of parameters.
ISSN:1053-587X
1941-0476
DOI:10.1109/TSP.2012.2184537