On the capacity region of multiple-access relay channels

The capacity regions of two classes of multiple­ access relay channels (MARes) are characterized. The MARes studied in this paper include a primitive relay component, which can help in relaying the messages through a non-interfering finite-capacity link to the decoder. The capacity regions for such MARes are characterized when: (a) the decoder's output is a physically degraded version of the relay's output or, (b) the relay output can be obtained as a deterministic function of the decoder output and any one of the channel inputs. For both these classes of MARes, it is shown that the cut-set outer bound is achievable. As a consequence of the result for case (b), the capacity of a class of state-dependent multiple-access channels with rate-limited state information at the decoder is also established.

• Type: Journal
• Year: 2011
• Where: CISS
• Authors: Ravi Tandon, H. Vincent Poor
• Keywords: Capacity Regions, CISS 2011, Degraded Version, Information Technology, Outer Bound