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For the Wireless Sensor Network (WSN), this paper proposes an efficient cooperative transmission strategy based on virtual MIMO. It cooperates together on STBC coding 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, furthermore, a decoding scheme based on block QR decomposition by using Gram-Schmidt orthonormalization is introduced.
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