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In this paper, the authors consider a clustered wireless sensor network where sensors within each cluster relay data packets to nearby clusters using cooperative communications. They propose a cooperative transmission scheme based on distributed Space-Time Block Coding (STBC), and conduct a systematic analysis on the resulting energy consumption. Compared with existing work, their distinctions are two-fold: only sensors that can correctly decode received packets participate in the cooperative transmission, where the number of cooperating nodes depends on both channel and noise realizations; and they use packet-error-rate based analysis rather than symbol-error-rate based analysis.
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