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A robust approach for clock offset estimation in wireless sensor networks

Author(s): Kim, JS (Kim, Jang-Sub); Lee, J (Lee, Jaehan); Serpedin, E (Serpedin, Erchin); Qaraqe, K (Qaraqe, Khalid)Kim, JS (Kim, Jang-Sub); Lee, J (Lee, Jaehan); Serpedin, E (Serpedin, Erchin); Qaraqe, K (Qaraqe, Khalid) Source: EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING: Art. No. 132381 2010

The maximum likelihood estimators (MLEs) for the clock phase offset assuming a two-way message exchange mechanism between the nodes of a wireless sensor network were recently derived assuming Gaussian and exponential network delays. However, the MLE performs poorly in the presence of non-Gaussian or nonexponential network delay distributions. Currently, there is a need to develop clock synchronization algorithms that are robust to the distribution of network delays. This paper proposes a clock offset estimator based on the composite particle filter (CPF) to cope with the possible asymmetries and non-Gaussianity of the network delay distributions. Also, a variant of the CPF approach based on the bootstrap sampling (BS) is shown to exhibit good performance in the presence of reduced number of observations. Computer simulations illustrate that the basic CPF and its BS-based variant present superior performance than MLE under general random network delay distributions such as asymmetric Gaussian, exponential, Gamma, Weibull as well as various mixtures.

Author(s):  Kim, JS (Kim, Jang-Sub); Lee, J (Lee, Jaehan); Serpedin, E (Serpedin, Erchin); Qaraqe, K (Qaraqe, Khalid)Kim, JS (Kim, Jang-Sub); Lee, J (Lee, Jaehan); Serpedin, E (Serpedin, Erchin); Qaraqe, K (Qaraqe, Khalid)
Source:  EURASIP JOURNAL ON ADVANCES IN SIGNAL PROCESSING: Art. No. 132381 2010
Language:  English
Document Type:  Article
KeyWords Plus:  SYNCHRONIZATION; ALGORITHM; DELAYS
Addresses:  Kim, Jang-Sub; Lee, Jaehan; Serpedin, Erchin; Qaraqe, Khalid] Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA
Reprint Address:  Serpedin, E, Texas A&M Univ, Dept Elect & Comp Engn, College Stn, TX 77843 USA.
Funding Agency:  Qtel - QNRF
Publisher:  HINDAWI PUBLISHING CORPORATION
Publisher Address:  410 PARK AVENUE, 15TH FLOOR, #287 PMB, NEW YORK, NY 10022 USA
ISSN:  1687-6172
29-char Source Abbrev.:  EURASIP J ADV SIGNAL PROCESS
ISO Source Abbrev.:  EURASIP J. Adv. Signal Process.
Subject Category:  Engineering, Electrical & Electronic
ISI Document Delivery No.:  636ZY


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