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Cooperative Communications




Cooperative communications take advantage of the broadcast nature of wireless channels, use relay nodes as virtual antennas, and thus realize the benefits of multiple-input-multiple-output communications in situations where physical multiple antennas are difficult to deploy (e.g., small sensor nodes). Various cooperative protocols have been proposed, such as amplify-and-forward, ecode-and-forward, and estimate-and-forward.

Although the physical layer performance of cooperative communications has been extensively studied in the context of small networks from an information theoretic point of view, there are still many open problems in terms of how to realize its full benefits in large-scale networks through efficient resource allocation. In particular, such performance optimization requires the knowledge of global channel information (including that for source-destination, source-relay, and relay-destination channels) and heterogeneous resource constraints among users. We focus on designing cooperative communication schemes that work in large networks or new application scenarios (such cognitive radio networks).



story | by Dr. Radut