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Proceedings Paper

Clock offset estimation in wireless sensor networks using robust M-estimation
Author(s): Jaehan Lee; Jangsub Kim; Khalid Qaraqe; Erchin Serpedin
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Paper Abstract

Clock synchronization plays a crucial role in Wireless Sensor Networks (WSNs). Assuming that there is no clock skew between sensor nodes, the Maximum Likelihood Estimate (MLE) of clock offset was derived by [1] for clock synchronization protocols assuming exponential random delays and a two-way message exchange mechanism as in TPSN (Timing-sync Protocol for Sensor Networks [2]) or NTP (Network Time Protocol). The MLE is appropriate for the case that the random delays in WSNs are exponentially distributed. However, the performance of the MLE is deteriorated considerably in the case that the underlying distribution is contaminated by or mixed with other distributions. Hence, a robust estimator is needed. In this paper, clock offset estimators based on the robust M-estimation method are proposed and it is shown that the proposed estimators present excellent performance in the mean squared error (MSE) sense under the condition that the underlying distribution is mixed with other distribution.

Paper Details

Date Published: 7 January 2009
PDF: 5 pages
Proc. SPIE 7297, Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV, 729726 (7 January 2009); doi: 10.1117/12.823690
Show Author Affiliations
Jaehan Lee, Texas A&M Univ. (United States)
Jangsub Kim, Texas A&M Univ. (United States)
Khalid Qaraqe, Texas A&M Univ. (United States)
Erchin Serpedin, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 7297:
Advanced Topics in Optoelectronics, Microelectronics, and Nanotechnologies IV
Paul Schiopu; Cornel Panait; George Caruntu; Adrian Manea, Editor(s)

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