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This paper considers a multi-source Orthogonal Frequency Division Multiplexing (OFDM)-based network of access points wherein dedicated relays use the decode-and-forward relaying. The authors investigate the joint problem of transmission strategy selection (relaying v/s direct), relay assignment, and power allocation to maximize the minimum rate across sources in two different cooperative scenarios; subcarrier-based and block-based relaying. In the subcarrier-based scheme, each subcarrier is treated as an independent transmission; however, in addition to the synchronization problems caused, it is likely impractical for a relay to decode a subset of subcarriers. Thus, they study relay selection for the entire OFDM block.
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