%0 Journal Article
%T Time-varying Clock Offset Estimation in Two-way Timing Message Exchange in Wireless Sensor Networks Using Factor Graphs
%A Aitzaz Ahmad
%A Davide Zennaro
%A Erchin Serpedin
%A Lorenzo Vangelista
%J Mathematics
%D 2012
%I arXiv
%X 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.
%U http://arxiv.org/abs/1202.0022v1