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中文摘要：
针对WSN（无线传感器网络）提出一种基于虚拟MIMO的高效协作传输策略．该策略在簇内进行协作STBC编码，而在簇间采用协作V—BLAST编码，通过在能量和处理能力不受限的DGN（数据聚集节点，也即Sink节点）端配置多个接收天线来提取来自于各簇的信息．针对新的传输方案提出了一种基于Gram—Schmidt正交化块QR分解的解码策略，对分集与复用之间的折衷也进行了讨论．仿真表明，新方案能够在不降低系统传输可靠度的前提下，极大地提高WSN系统的传输效率．
英文摘要：
An efficient cooperative transmission strategy in WSN （Wireless Sensor Network） is proposed in this paper. In the strategy, the STBC space time coding is adopted in the inner-cluster, while the inter-cluster makes use of the V-BLAST scheme. The information coming from multiple clusters are extracted by configuring multiple receive antennas at the DGN （Data Gathering Node） whose energy and processing power are not constrained. To decrease the complexity of DGN, further more, a decoding scheme based on block QR decomposition by using Gram-Schmidt orthonormalization is introduced, in which the special structure of channel matrix is utilized to reduce the complexity of computation. The tradeoff between diversity and multiplexing is also discussed in this paper. The simulation results show that the proposed strategy can increase the efficiency of WSN, while the reliability is conserved.
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