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In this paper, we obtain a general achievable rate region and some certaincapacity theorems for multiple-access relay channel (MARC), using decode andforward (DAF) strategy at the relay, superposition coding at the transmitters.Our general rate region (i) generalizes the achievability part of Slepian-Wolfmultiple-access capacity theorem to the MARC, (ii) extends the Cover-El Gamalbest achievable rate for the relay channel with DAF strategy to the MARC, (iii)gives the Kramer-Wijengaarden rate region for the MARC, (iv) meets max-flowmin-cut upper bound and leads to the capacity regions of some important classesof the MARC.

A General Achievable Rate Region for Multiple-Access Relay Channels and Some Certain Capacity Theorems