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针对并行估计结构的无线传感器网络,讨论了无线传感器网络中的分布式估计问题,提出了一种能量有效的分布式估计算法,并对相应的功率分配问题进行了阐述。系统对于同一观测目标采用多发送单接收模式,由汇聚中心依据观测区域内的所有传感器节点发送的信息对观测对象做出估计,该算法基于LMMSE准则,考虑总能量受限和各支路信道状态信息两方面的因素,在满足一定系统性能要求的前提下,选定部分节点作为活动节点传输数据,并参与相应的功率分配,关闭未被选中的节点电源,从而实现有效的节能,进而延长无线传感器网络的生命周期。实验结果表明,该分布式估计的功率分配算法下的系统性能以及估计值的均方误差性能明显优于基于平均功率分配算法。
Aiming at the WSN with parallel estimation structure, the distributed estimation problem in wireless sensor networks is discussed. An energy efficient distributed estimation algorithm is proposed and the corresponding power allocation problem is described. The system uses multiple sending single receiving mode for the same observation target, and the aggregation center estimates the observed objects based on the information sent by all the sensor nodes in the observed area. The algorithm considers the total energy limited and the channel states of each branch based on the LMMSE criterion Information on the two factors, to meet certain system performance requirements under the premise of the selected part of the node as the active node to transmit data and participate in the corresponding power distribution, turn off the unselected node power, in order to achieve effective energy saving, and thus extend the wireless The life cycle of the sensor network. The experimental results show that the system performance and the mean square error of the estimation under the distributed estimation power allocation algorithm are obviously better than those based on the average power allocation algorithm.