Cooperative distributed MIMO channels in wireless sensor networks
Cooperative distributed MIMO channels in wireless sensor networks
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DOI：
10.1109/jsac.2007.070215
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发表时间：
2007-02
影响因子：
16.4
通讯作者：
A. D. Coso;U. Spagnolini;C. Ibars
中科院分区：
文献类型：
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作者：
A. D. Coso;U. Spagnolini;C. Ibars
大量的网络节点和能量约束使得无线传感器网络（WSN）成为协作分集的重要应用领域之一。节点合作增加了无线信道的空间分集，从而降低了传输功率。在本文中，我们提出了一种多跳无线传感器网络，将节点分组在协作集群中，利用集群节点之间的发送和接收合作。通过连接单个集群到集群的跳来实现多跳传输，其中每个集群到集群链路被定义为一个协作的分布式多输入多输出（MIMO）信道。传输分集通过基于两个时隙的时分、解码和转发中继方案来利用：用于集群内数据共享的集群内时隙和用于集群之间传输的集群间时隙。在接收端，基于选择分集算法设计了分布式接收协议。提出的多跳协作WSN在给定每条链路能量约束的情况下，通过推导每一跳的簇内和簇间槽上分配的最佳时间和功率，优化设计为端到端中断概率最小。提出了一种简化的次优资源分配方法，其执行性能接近于最优策略。结果表明，该方案可实现与等效MIMO系统相当的分集，并显著降低能耗。非合作渠道
The large number of network nodes and the energy constraints make Wireless Sensor Networks (WSN) one of the most important application fields for Cooperative Diversity. Node cooperation increases the spatial diversity of wireless channels and, thus, reduces the transmitted power. In this paper, we propose a multi-hop WSN with nodes grouped in cooperative clusters that exploits transmit and receive cooperation among cluster nodes. Multi-hop transmission is carried out by concatenating single cluster-to-cluster hops, where every cluster-to-cluster link is defined as a cooperative distributed multiple-input-multiple-output (MIMO) channel. Transmit diversity is exploited through a time-division, decoder-and-forward, relaying scheme based upon two time slots: the Intracluster Slot, used for data sharing within the cluster, and the Intercluster Slot, used for transmission between clusters. At the receiver side, a distributed reception protocol is devised based upon a Selection Diversity algorithm. The proposed multi-hop cooperative WSN is optimally designed for minimum end-to-end outage probability by deriving the optimum time and power allocated on the intracluster and intercluster slots of every single hop, given a per-link energy constraint. A simplified suboptimum resource allocation is also proposed, which performs close to the optimal policy. Results show that the proposed scheme achieves diversity equal to the equivalent MIMO system and significantly reduces energy consumption with respect to. the non-cooperative channel