中文摘要：

针对基于虚拟多进多出技术的无线传感器网络系统,分析了在信道衰落下的平均误码率,并提出了使用各协作节点最优传输功率的新方案,推导出基于Nt×1虚拟多进多出系统的最优传输功率表达式.理论分析和仿真表明：与等功率传输相比,传输功率优化方案可获得更低的误码率.同时,对协作节点数与传输效能的折中设计进行了探讨.仿真结果表明：低功率传输时,应适当降低协作节点数,以降低有效传输能耗.

英文摘要：

In lhis paper,authors analyzed the performance of bit error rate for a virtual multiple-input multiple-output （MIM（）） based communications architecture used in wireless sensor networks, and proposed an optimal transmitting power（TP） scheme for transmitting cooperative sensor nodes in one cluster. Closed-form of the optimal TP for each cooperating node was derived by minimizing hit error rate （BER） of the Nt× 1 virtual MIMO system. Through theo- retical analysis and simulation, it is indicated that compared to an equal TP assignment method,the lowest perfor mance of hit error rate can be obtained by using the optimal TP scheme. Furthermore,a compromise plan was made between the number of cooperating nodes and transmitting. Simulation results show that with low power delivered, the number of cooperating nodes should be decreased to obtain the lower effective transmitting energy consumption.