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Technical University of Crete
Technical University of Crete
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| URI: | http://purl.tuc.gr/dl/dias/D4EFC706-5B4F-4FFC-8CD4-8222208DE71C | ||
| Year | 2007 | ||
| Type of Item | Peer-Reviewed Journal Publication | ||
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| Bibliographic Citation | A. Bletsas, H. Shin, M.Z. Win, "Cooperative Communications with Outage-Optimal Opportunistic Relaying", IEEE Transactions on Wireless Communications (TWC), vol. 6, no. 9, pp. 3450-3460, Sept. 2007. DOI: 10.1109/TWC.2007.06020050 https://doi.org/10.1109/TWC.2007.06020050 | ||
| Appears in Collections |
In this paper, we present simple opportunistic relaying with decode-and-forward (DaF) and amplify-and-forward (AaF) strategies under an aggregate power constraint. In particular, we consider distributed relay-selection algorithms requiring only local channel knowledge. We show that opportunistic DaF relaying is outage-optimal, that is, it is equivalent in outage behavior to the optimal DaF strategy that employs all potential relays. We further show that opportunistic AaF relaying is outage-optimal among single-relay selection methods and significantly outperforms an AaF strategy based on equal-power multiple-relay transmissions with local channel knowledge. These findings reveal that cooperation offers diversity benefits even when cooperative relays choose not to transmit but rather choose to cooperatively listen; they act as passive relays and give priority to the transmission of a single opportunistic relay. Numerical and simulation results are presented to verify our analysis.
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