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In this paper, the authors propose a dynamic power allocation scheme for a single-relay network based on Orthogonal Frequency Division Multiplexing (OFDM) modulation with limited feedback. They consider an Amplify-and-Forward (AF) cooperative diversity model, where one source node communicates with one destination node assisted by one half duplex relay. The power allocation scheme employs a codebook of quantized power allocation vectors designed offline equipped on the source, relay, and destination. The destination, which has full knowledge of Channel State Information (CSI), chooses the best power allocation vector and sends back its index to the source and relay nodes, which results in a dramatic reduced overhead over conventional resource allocation.
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