无线自组织网络协作时间同步优化算法

针对无线自组织协作网络时间同步算法同步误差大及能量消耗高的问题，在分析网络时间同步模型基础上，提出无线自组织网络协作时间同步优化算法。该算法利用指数延迟模型，通过构建时间同步似然函数，对成对节点的时钟偏移及时钟漂移进行联合估计；对网络进行三角剖分，通过染色确定参考节点，然后参考节点选取主节点，利用拓扑结构的自适应变化实现全网节点时钟同步；通过时钟联合估计及自适应拓扑建立协作时间同步优化算法，其整体执行保证节点通信链路时间同步。仿真结果表明，在所提三角剖分拓扑结构控制下，与传统分簇拓扑相比，协作时间同步优化算法在平均同步误差、同步算法能量消耗方面得到了性能提升。

Cooperative Time Synchronization Optimization Algorithm for Wireless Ad Hoc Networks

The time synchronization algorithm for wireless ad hoc networks has some problems including large synchronization error and high energy consumption. A cooperative time synchronization optimization algorithm for wireless ad hoc networks is proposed on the basis of analyzing the network time synchronization models. In the proposed algorithm, an exponential delay model is used to estimate the clock offset and clock drift of pairwise nodes by constructing time synchronization likelihood function. Then the network is triangulated. The reference node is determined by dyeing, and the master node is selected by the reference node. The whole network node clock synchronization is realized by using the adaptive change of topology structure. The cooperative time synchronization optimization algorithm is established by clock joint estimation and adaptive topology, and its overall execution ensures the time synchronization of node communication link. The simulated results show that,compared with the traditional clustering topology, the proposed algorithm has achieved performance improvement in two aspects of average synchronization error and energy consumption under the control of triangulation topology proposed in this paper. Key