无线传感网下低能耗快速物理层主机同步

在无线传感器网络通信中,物理层同步捕获是制约节点复杂度和功耗的重要环节.为了进一步减少标签节点的同步捕获时长和反馈功耗,在脉冲主机同步算法的基础上,提出了相位误差估计同步捕获算法.标签节点采用对称双极性锯齿相关波形,锯齿信号相关输出由于具备与相位误差间的线性关系,所以可获得更好的稳定性和捕获速度.对这种基于发射端主机(锚节点)的同步捕获性能进行了理论分析,并通过仿真验证了理论分析的正确性,同时比较了与原算法在非理想信道下的捕获性能.

Energy-efficient and Rapid Master Synchronization in Physical-layer of Wireless Sensor Networks

Synchronization in physical layer of wireless sensor networks is critical in restricting complexity of tag node and power consumption. In order to reduce acquisition time and cost in feedback, the phase error estimation algorithm is proposed based on the pulse master synchronization. Because of the linear relationship between the phase error and the sawtooth correlation output using the symmetric bipolar sawtooth in the tag node, the better stability and acquisition speed can be obtained. We analyze the synchronization acquisition performance based on the master node (anchor node) at the transmitter and further verified by simulation in the paper. At the same time, the acquisition performance of the two algorithms is compared under the non-ideal channel.