Based on MLE of Pairwise Broadcast Clock Synchronization for Wireless Sensor Network

Pairwise Broadcast is a novel low-power wireless sensor network clock synchronization method. A subset of sensor nodes are synchronized by overhearing the timing message exchanges of a pair of sensor nodes. Therefore, a group of sensor nodes can be synchronized without sending any extra messages. This paper mainly account for the problem that the original Pairwise Broadcast Synchronization in absence of the clock skew between the pairwise broadcast node, proposed that use MLE(Maximum Likelihood Estimation) for accurate estimation of the clock offset and clock skew of nodes under Gaussian delay model. The simulation results indicate this method to ensure high accuracy simultaneously effectively reduce energy consumption.