Relay selection and data transmission throughput tradeoff in cooperative systems
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Analysis, insights and generalization of a fast decentralized relay selection mechanism
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Splitting algorithms for fast relay selection: generalizations, analysis, and a unified view
IEEE Transactions on Wireless Communications
Enhanced relay selection decision for cooperative communication in energy constrained networks
WD'09 Proceedings of the 2nd IFIP conference on Wireless days
Minimum energy consumption design of a two-hop relay network for QoS guarantee
WTS'10 Proceedings of the 9th conference on Wireless telecommunications symposium
The relay selection and transmission trade-off in cooperative communication systems
IEEE Transactions on Wireless Communications
Opportunistic relay selection with cooperative macro diversity
EURASIP Journal on Wireless Communications and Networking
Capacity calculation for multi-relay channel in the presence of noise and fading
CIT'11 Proceedings of the 5th WSEAS international conference on Communications and information technology
Optimal Relay Selection for Energy-Efficient Multicast
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
Capacity Maximization through Energy-Aware Multi-Mode Relaying
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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We consider a cooperative wireless network where a set of nodes cooperate to relay in parallel the information from a source to a destination using a decode-and-forward approach. The source broadcasts the data to the relays, some or all of which cooperatively beamform to forward the data to the destination. We generalize the standard approaches for cooperative communications in two key respects: (i) we explicitly model and factor in the cost of acquiring channel state information (CSI), and (ii) we consider more general selection rules for the relays and compute the optimal one among them. In particular, we consider simple relay selection and outage criteria that exploit the inherent diversity of relay networks and satisfy a mandated outage constraint. These criteria include as special cases several relay selection criteria proposed in the literature. We obtain expressions for the total energy consumption for general relay selection and outage criteria for the non-homogeneous case, in which different relay links have different mean channel power gains, and the homogeneous case, in which the relay links statistics are identical. We characterize the structure of the optimal transmission scheme. Numerical results show that the cost of training and feedback of CSI is significant. The optimal strategy is to use a varying subset (and number) of relay nodes to cooperatively beamform at any given time. Depending on the relative location of the relays, the source, and the destination, numerical computations show energy savings of about 16% when an optimal relay selection rule is used. We also study the impact of shadowing correlation on the energy consumption for a cooperative relay network.