无线传感器网络中一种基于分簇的能量高效虚拟MIMO传输策略

Energy-efficiency Cluster-based Cooperative MIMO Transmission Scheme for Wireless Sensor Networks

协作式MIMO技术被认为是传感器网络中有效的节能解决方案之一.针对中小规模传感器网络设计了一种基于分簇的能量高效的协作式虚拟MIMO传输策略(ECCM).在考虑了分布式STBC编码信道训练开销的情况下,分析了该传输策略的系统总体能耗.基于该能耗模型,建立了一种基于端到端的全网能耗最优化模型,并用该模型来求解最优的虚拟MIMO域(分簇)个数、协作节点(虚拟天线)个数以及传输速率等网络通信参数.仿真结果表明,通过选取最优协议参数,即使考虑到电路能耗和信道训练开销,ECCM策略也能显著降低节点传输能耗,延长网络寿命.

Cooperative MIMO technique is one of the effective solutions to minimize the energy consumption. In this paper, an Energy-efficient Cluster-based Cooperative MIMO transmission scheme （ECCM） is proposed to maximize the network lifetime. This paper first analyzes the energy efficiency of ECCM with the consideration of the channel training overhead. Then, an optimization model is developed to find the optimal number of cooperative nodes, number of clusters and transmission rates. Simulation results show that tremendous energy saving is possible with judicious choice of designed protocol parameters even considering the local circuit energy cost and STBC training overhead.