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The authors consider a dual-hop cooperative spectrum sharing system with multiple relays that are available to opportunistically help the secondary communication system. In this primary/secondary cooperative system, they propose using a Reactive Relay Selection (RRS) technique at the secondary system in which the best relay is chosen based on both the first and second hops transmission conditions. In fact, the best relay is selected as the relay node that not only satisfies a minimum required rate on the first-hop transmission, but can also achieve the highest Signal-to-Noise Ratio (SNR) at the destination node.
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