Energy efficiency of dense wireless sensor networks: To cooperate or not to cooperate
Energy efficiency of dense wireless sensor networks: To cooperate or not to cooperate
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DOI：
10.1109/jsac.2007.070220
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发表时间：
2007-02-01
影响因子：
16.4
通讯作者：
Win, Moe Z.
中科院分区：
文献类型：
--
作者：
Quek, Tony Q. S.;Dardari, Davide;Win, Moe Z.
无线传感器节点网络中的分散式检测涉及来自地理上分散的节点的关于感兴趣的现象（POI）的信息的融合。在本文中，我们研究了在密集和随机部署的无线传感器网络（WSN）中的二进制分散检测问题，其中节点和融合中心之间的通信信道是带宽受限的。我们考虑的情况下，传感器的观察，条件的备择假设，是独立的，但不相同的分布在传感器节点。我们比较了两种不同的融合架构，即并行融合架构（PFA）和合作融合架构（CIA），对于这样的带宽受限的无线传感器网络，其中每个传感器节点被限制发送1位信息的融合中心。对于每一种架构，我们推导出在融合中心的决策错误的概率表达式。我们提出了一个共识洪泛协议，并分析了它的平均能耗。我们分析了PoI强度，现实的链路模型，共识泛洪协议，和网络连接的系统可靠性和平均能耗的融合架构的影响。我们证明了在CIA中存在空间分集增益、平均能耗、共识洪泛协议的交付率、网络连通性、节点密度和POI强度之间的权衡。然后，我们提供深入了解合作无线传感器网络的设计。
Decentralized detection in a network of wireless sensor nodes involves the fusion of information about a phenomenon of interest (PoI) from geographically dispersed nodes. In this paper, we investigate the problem of binary decentralized detection in a dense and randomly deployed wireless sensor network (WSN), whereby the communication channels between the nodes and the fusion center are bandwidth-constrained. We consider a scenario in which sensor observations, conditioned on the alternate hypothesis, are independent but not identically distributed across the sensor nodes. We compare two different fusion architectures, namely, the parallel fusion architecture (PFA) and the cooperative fusion architecture (CIA), for such bandwidth-constrained WSNs, where each sensor node is restricted to send a 1-bit information to the fusion center. For each architecture, we derive expression for the probability of decision error at the fusion center. We propose a consensus flooding protocol or and analyze its average energy consumption. We analyze the effects of PoI intensity, realistic link models, consensus flooding protocol, and network connectivity on the system reliability and average energy consumption for both fusion architectures. We demonstrate that a trade-off exists among spatial diversity gain, average energy consumption, delivery ratio of the consensus flooding protocol, network connectivity, node density, and PoI intensity in CIA. We then provide insight into the design of cooperative WSNs.