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针对无线传感器网络(WSN)中多节点协作传输问题,研究了分簇式无线传感器网络中基于虚拟多输入单输出(MISO)技术的系统性能.首先推导了系统簇内广播阶段、簇间传输阶段的误符号率(SER)以及2个阶段系统整体误符号率的表达式;然后给出了系统整体误符号率一种有效的下界,并进行了仿真验证;最后将系统误符号率作为约束,建立了优化系统功率分配模型,并提出了求解该模型极值解的有效方法.仿真结果表明,在满足系统一定误符号率要求下,优化模型有效地节约了系统能量.
Aiming at the problem of multi-node cooperative transmission in wireless sensor networks (WSNs), the performance of the system based on Virtual Multiple Input Single-Output (MISO) in clustered WSNs is studied.Firstly, (SER) as well as the expression of the symbol error rate of the whole system in two phases. Then, an effective lower bound of the symbol error rate of the system is given and verified by simulation. Finally, the system symbol error rate is used as the constraint, An optimal power distribution model for the system is established and an effective method for solving the extreme solution of the model is proposed.The simulation results show that the optimization model can effectively save the system energy when meeting certain error symbol rate of the system.