基于因子图的无线传感器网络双向定时消息交换时变时钟偏移估计
Time-varying Clock Offset Estimation in Two-way Timing Message Exchange in Wireless Sensor Networks Using Factor Graphs
摘要：
研究了当观测时间戳的似然函数服从指数分布时，双向定时交换系统中的钟差估计问题。为了捕捉节点振荡器中的缺陷，这使得时变性质的时钟偏移，提出了一种新的贝叶斯方法的时钟偏移估计使用因子图表示的后验密度。使用最大乘积算法的消息传递产生贝叶斯推理问题的封闭形式表达式。
英文摘要：
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.
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