Throughput Analysis of Multiple Access Relay Channel under Collision Model

—Despite much research on the throughput of relaying networks under idealized interference models, many practical wireless networks rely on physical-layer protocols that preclude the concurrent reception of multiple transmissions. In this work, we develop analytical frameworks for the uplink of a multi-source single-channel relay-aided wireless system where transmissions are scheduled to avoid collisions. We study amplify-and-forward and decode-and-forward strategies, in both time-sharing and network-coded variants, and provide mathematical models to investigate their achievable rate regions. Both general and optimal power allocations are considered. We also find the cut-set outer bounds for the rate regions. Moreover, we present a comparison between these methods with the simple time sharing scheme. Our numerical results reveal that optimizing power allocation favors the time sharing scheme significantly more than it does the relaying schemes, so that time sharing under some circu...

• Type: Journal
• Year: 2010
• Where: INFOCOM
• Authors: Seyed A. Hejazi, Ben Liang
• Keywords: Achievable Rate Regions, Communications, INFOCOM 2010, Power Allocation, Rate Regions