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Sensors 2017, 17(4), 824; doi:10.3390/s17040824

A Robust Diffusion Estimation Algorithm with Self-Adjusting Step-Size in WSNs

1,2
,
1,†,* , 2
and
2
1
College of Electronic and Information Engineering, School of Mathematics and Statistics, Southwest University, and Key Laboratory of Nonlinear Circuits and Intelligent Information Processing, Chongqing 400715, China
2
College of Electronic and Information Engineering, Southwest University, Chongqing 400715, China
Current address: Key Laboratory of Nonlinear Circuits and Intelligent Information Processing, No.2, Tiansheng Road, Beibei District, Chongqing 400715, China
*
Author to whom correspondence should be addressed.
Received: 24 February 2017 / Revised: 1 April 2017 / Accepted: 7 April 2017 / Published: 10 April 2017
(This article belongs to the Section Sensor Networks)
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Abstract

In wireless sensor networks (WSNs), each sensor node can estimate the global parameter from the local data in a distributed manner. This paper proposed a robust diffusion estimation algorithm based on a minimum error entropy criterion with a self-adjusting step-size, which are referred to as the diffusion MEE-SAS (DMEE-SAS) algorithm. The DMEE-SAS algorithm has a fast speed of convergence and is robust against non-Gaussian noise in the measurements. The detailed performance analysis of the DMEE-SAS algorithm is performed. By combining the DMEE-SAS algorithm with the diffusion minimum error entropy (DMEE) algorithm, an Improving DMEE-SAS algorithm is proposed for a non-stationary environment where tracking is very important. The Improving DMEE-SAS algorithm can avoid insensitivity of the DMEE-SAS algorithm due to the small effective step-size near the optimal estimator and obtain a fast convergence speed. Numerical simulations are given to verify the effectiveness and advantages of these proposed algorithms. View Full-Text
Keywords: robust diffusion estimation; self-adjusting step-size; non-Gaussian noise; wireless sensor networks robust diffusion estimation; self-adjusting step-size; non-Gaussian noise; wireless sensor networks
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Shao, X.; Chen, F.; Ye, Q.; Duan, S. A Robust Diffusion Estimation Algorithm with Self-Adjusting Step-Size in WSNs. Sensors 2017, 17, 824.

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