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In selective cooperative relaying only a single relay out of the set of available relays is activated, hence the available power and bandwidth resources are efficiently utilized. However, implementing selective cooperative relaying in time-varying channels may cause frequent relay switchings that deteriorate the overall performance. In this paper, the authors study the rate at which a relay switching occurs in selective cooperative relaying applications in time-varying fading channels. In particular, they derive closed-form expressions for the relay switching rate (measured in Hz) for Opportunistic Relaying (OR) and Distributed Switch and Stay Combining (DSSC).
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