Cooperative Wireless Systems: A Diversity-Multiplexing Tradeoff Perspective
Abstract
We consider a general multiple antenna network with multiple sources, multiple destinations and multiple relays in terms of diversity-multiplexing tradeoff (DMT). We examine several projections of this most general problem taking into account the network geometry (clustered or non-clustered), the processing capability of the relays (half-duplex or full-duplex) and the number of antennas the nodes have. We first study a system with a single source-destination pair and multiple relays, each node with a single antenna, and show that even under idealistic assumptions, this virtual multi-input multi-output (MIMO) system can never fully mimic a real MIMO DMT. We provide communication strategies that achieve the best DMT of this relay system. We extend our work to cover cooperative systems with multiple sources and multiple destinations. We next study the relay channel with multiple antenna nodes for full-duplex relays to understand the effect of increased degrees of freedom in the direct link. We find DMT upper bounds and investigate the achievable performance of decode-and-forward (DF), and compress-and-forward (CF) protocols. As having a full-duplex relay is an idealistic assumption, we also study the multiple antenna relay channel with half-duplex relays. We also study the multiple-access relay channel (MARC) as a subproblem of the most general network, and evaluate how CF works in MARC.Keywords
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