QR-based incremental minimum-Wilcoxon-norm strategies for distributed wireless sensor networks

Authors:
Upendra Kumar Sahoo;Ganapati Panda;Bernard Mulgrew;Babita Majhi
Affiliations:
Department of ECE, National Institute of Technology, Rourkela 769008, India;School of Electrical Science, Indian Institute of Technology, Bhubaneswar 751013, India;IDCOM, The University of Edinburgh, Edinburgh, UK;Department of CS&IT, G. G. Vishwayavidyalaya, Central University, Bilaspur 495009, India
Venue:
Signal Processing
Year:
2012

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Abstract

When outliers are present in the desired data, the conventional distributed adaptive estimation algorithms exhibit poor performance. To alleviate this shortcoming a novel distributed robust incremental strategy based on QR decomposition and the Wilcoxon score is proposed which convergence speed is faster than the other previous techniques. To demonstrate the potential of this algorithm simulation study is carried out for the distributed estimation of parameters in the presence of weak to strong outliers in the desired data. The results show that the performance of the new algorithm is robust against outliers compared to conventional incremental RLS algorithm. Further to achieve low communication overhead, a new scheme is introduced and its performance has been assessed through simulation study. It is observed that the proposed scheme even though exhibits slightly inferior performance but offers substantially reduction in terms of communication overhead.