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In this paper, the authors consider a cooperative system based on relay selection in a scenario where the available Channel State Information (CSI) is subject to delays. In order to exploit the selection diversity gains of the system while providing robustness against CSI inaccuracy, they propose a robust relay selection strategy based on a Minimum Mean Square Error (MMSE) Bayesian estimator. As shown in the paper, the proposed robust strategy provides significant gains in scenarios with different levels of CSI inaccuracy.
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