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In a multi-relay system, the instantaneous Channel State Information (CSI) is usually required at relays to achieve space diversity. In this paper, the authors propose a delayed non-coherent relaying scheme to achieve space diversity without requiring CSI at the relays. Specifically, each relay will non-coherently amplify and forward its received signals with different delays such that a virtual multipath channel is created between the source and destination. They will first determine the most efficient way to achieve the optimum diversity gain.
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