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In this paper, the authors exploit the benefits of the diversity gains arising from a cluster of Opportunistic Relays (OR) and from the independently fading subcarriers of multiple users. Their goal is to improve the energy-efficiency of the OR assisted Single-Carrier Frequency-Division Multiple-Access (SC-FDMA) uplink using Amplify-and-Forward (AF), where the Direct Transmission (DT) link is unavailable. By assuming that the pilot aided Channel Quality Information (CQI) of all the users may be exchanged amongst the cooperating relays, they propose two joint Dynamic Resource Allocation (DRA) schemes based on the so-called 'First-hop quality awareness'.
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