虚拟MIMO技术能够有效减少信道衰落对无线链路的影响,节省无线传输时的能耗.结合MIMO多播和LEACH协议,提出新的虚拟MIMO多跳传输策略(VMMM),由于该策略避免了多跳数据转发时的簇内广播过程,从而提高整个网络的能量有效性.为优化该传输策略的性能,本文对VMMM策略的能耗进行建模分析,并在此基础上通过联合优化以确定满足最小能耗时的网络参数.仿真结果表明,与已有的虚拟MIMO多跳传输策略-vMISO协议相比,VMMM策略能够显著提高网络的能量有效性,有效延长网络生存时间达50％以上.%Virtual MIMO technique can greatly reduce the fading effect of wireless link, and save transmission energy. In this paper, we proposed a new virtual MIMO multihop transmission scheme (VMMM) by combining MIMO multicast with LEACH protocol. Through avoiding intra-cluster broadcast in multi-hop data forwarding process, this transmission scheme can improve the energy efficiency of sensor networks. In order to optimize the performance of VMMM, we first analyzed the energy consumption of this scheme, and then developed a jointly optimization model to determine the optimum network parameters. Simulation results show that compared with the previous virtual MIMO multi-hop transmission scheme (vMISO protocol) , the proposed scheme significantly improves the energy efficiency, and prolong the network lifetime by at least 50%.
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