无线传感器网络IRBS时间同步优化算法

IRBS Time Synchronous Optimization Algorithm of Wireless Sensor Networks

针对无线传感器网络参考广播时间同步(RBS)算法网络同步精度低和网络能耗开销较大的问题,提出了一种改进的参考广播同步算法IRBS(Improved References Broadcast Ring Synchronization)。该算法是在RBS算法的基础上,采用最大后验法估算不相邻接收节点之间相位偏差,然后采用最小二乘法拟合对时间偏差和频率偏差进行补偿。仿真结果显示,改进的算法同步精度优于RBS算法,且网络开销和能耗也显著减少。

Aiming at wireless sensor network References Broadcast Time Synchronization （RBS） algorithm having a problem that network synchronous low accuracy and network large overhead of energy consUmption, improved algorithm IRBS is proposed. The algorithm was based on RBS algorithm, and estimated phase offset of nonadjacent receiving nodes by maxi- mum posteriori estimation,then used least-squares fit to compensate time deviation and frequency deviation. Simulation results show that, improved algorithm synchronization accuracy is better than RBS algorithm, the network overhead and energy con- sumption are also significantly reduced.