无线传感器网络中的协作节点个数优化

Optimum Number of Cooperative Nodes in Wireless Sensor Networks

为了提高无线传感器网络的能量效率,传感器节点采用空时编码协作和收端分集协作来传输信息。通过分析传感器节点的电路能耗和传输能耗,分别给出了两种协作方式下的网络总能耗。研究表明,对于每种协作方式,传输距离一定时,通过优化接收端协作节点的个数,可以使总能耗降低,传输距离不同时,最优的协作节点个数也不同。仿真结果显示,优化的收端分集协作总比传统的无协作方式能耗低,而当传输距离大于一个门限值时,优化后的空时编码协作优于收端分集协作。

Cooperative diversity could be used to improve energy efficiency in sensor networks. By analyzing the circuit energy consumption and the transmission energy consumption of sensor nodes, total energy consumption of space-time coded cooperation and cooperative diversity at the receiver was analyzed, respectively. Research shows that the number of collaborative nodes at the receiver can be optimized to minimize the total energy consumption when the transmission distance is a constant. We also show that the number of optimized collaborative nodes is different for various transmission distances. Simulation results indicate that the optimized space-time coded cooperation can save more energy for distances larger than a given threshold .