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On the Sum-Capacity of Degraded Gaussian Multiple-Access Relay Channels

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3 Author(s)
Sankar, L. ; Dept. of Electr. Eng., Princeton Univ., Princeton, NJ, USA ; Mandayam, Narayan B. ; Poor, H.V.

The sum-capacity is studied for a K-user physically degraded Gaussian multiple-access relay channel (MARC). Decode-and-forward (DF) is shown to achieve the sum-capacity and capacity region for a subclass of degraded Gaussian MARCs in which the multiple-access link from the sources to the relay is the bottleneck link. For the remaining subclass, DF is shown to achieve the K-user sum-capacity when the sources are symmetric, i.e., they transmit with the same transmit power. The optimality of DF is conjectured for the case of asymmetric sources.

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Information Theory, IEEE Transactions on  (Volume:55 ,  Issue: 12 )