In this paper, we propose a cooperative relay transmission scheme based on energy efficiency in clustered wireless sensor networks. In our scheme, the source cluster head selects the optimal neighboring cluster head as the relay node with the channel state informahon between the source cluster head and neighboring cluster heads. At the destination, a distributed reception protocol is devised based upon a Maximal Ratio Combining algorithm. To decrease energy consumption, the relay adjusts the transmiasion power depending on receiver feedback that the adjustment information is defined in the ACK frame according to receiving Signal-Noise-Ratio threshold. Then we derive the closed-form expression for the average symbol error probability based on partial channel state information.At last the Monte Carlo simulations are given to validate our analysis. The results show that the theoretical value is identical to the simulation value and our scheme can improve energy efficiency evidently without additional energy consumption.%本文针对分簇无线传感器网络,提出了一种基于能量效率的协同中继传输方案,该方案中源簇头根据源到邻簇头之间的信道状态信息选择最优中继节点;协同传输数据时,目的节点接收到两个时隙的信号后进行最大比合并,并根据设定的接收信噪比门限范围在确认帧中给中继节点反馈功率调整信息,以减少重传次数或降低中继节点的发射功率,在不增加开销的情况下可以减少系统总的能量消耗.文章利用概率密度函数推导了基于部分信道状态信息选择中继协同的误符号率闭式表达式,最后通过蒙特卡洛仿真进行了验证.结果表明:误符号率的理论推导值与仿真值一致,在相同的接收信噪比门限时,本文所提方案能够明显提高系统的能效性.
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