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Time-varying clock offset estimation in two-way timing message exchange in wireless sensor networks using factor graphs

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4 Author(s)
Aitzaz Ahmad ; Department of ECE, Texas A&M University, 77843 USA ; Davide Zennaro ; Erchin Serpedin ; Lorenzo Vangelista

The problem of clock offset estimation in a two-way timing exchange regime is considered when the likelihood function of the observation time stamps is exponentially distributed. In order to capture the imperfections in node oscillators, which render a time-varying nature to the clock offset, a novel Bayesian approach to the clock offset estimation is proposed using a factor graph representation of the posterior density. Message passing using the max-product algorithm yields a closed form expression for the Bayesian inference problem.

Published in:

2012 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)

Date of Conference:

25-30 March 2012