Partial Feedback Impact on Achievable Rate Region in Multiple Access Relay Channels

Abstract

For discrete memoryless Slepian-Wolf multiple access relay channel with relay-sources feedback (SW-MARCRSF),<br><br>an achievable rate region via partial decode and forward strategy at the relay is proposed, and by extending the<br><br>results to the continuous alphabet version, the corresponding achievable rate region of the Gaussian SW-MARC-RSF<br><br>is obtained. It is shown that our results include the important previous works on multiple-access channel (MAC)<br><br>with feedback (Cover-Leung rate region) and without feedback (Slepian-Wolf (SW) rate region, etc.) as special cases.<br><br>Finally, through comparison of the achievable rate regions, with and without feedback, the impact of feedback on<br><br>achievability is analyzed. The derived achievable rate region is shown to resolve the residual uncertainty at the receiver<br><br>in an efficient way and demonstrates that in the partial decode and forward strategy, relay-sources feedback increases<br><br>the achievable rate region in both discrete memoryless and Gaussian multiple access relay channels.