一种WSN中能量有效的分布式检测和功率分配算法  

A energy-efficient distributed detection and power allocation algorithm in wireless sensor networks

作　　者：郭晓东[1] 杜鹏[1] 张雪芬[2] 

机构地区：[1]山东大学网络与信息中心,山东济南250100 [2]山东财经大学计算机科学与技术学院,山东济南250014

出　　处：《山东大学学报（理学版）》2012年第9期60-64,共5页Journal of Shandong University(Natural Science)

摘　　要：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 parallel estimation structure for wireless sensor network, the distributed estimation problems in wireless sensor network were discussed and an energy efficient distributed estimation algorithm was presented in this paper as well as the corresponding power allocation problems are described. The system used the pattern of multiple transmission and single receiver for the same observation target. Convergence center gived the estimation of observation objects according to the messages sent by all sensor nodes in the observation areas. The algorithm was based on LMMSE standards. Considering two factors of total energy restriction and the state information of each branch channel and to satisfy the performance requirements of the premise, part of the node was chosed as the active node to transmit data and participate in the corresponding power distribution. Then the not selected node power supply was closed to save energy effectively and prolong the lifetime of wireless sensor network. The experimental results show that the system perform ance of the distributed estimation algorithm for power allocation and the estimated value of the mean square error per formance are superior to the algorithm for the equal power allocation.

关 键 词：无线传感器网络 能量有效 分布式估计 功率分配 平均功率 

分 类 号：TN911.22[电子电信—通信与信息系统]