Opportunistic cooperation by dynamic resource allocation

Deniz Gunduz, Elza Erkip
2007 IEEE Transactions on Wireless Communications  
We consider a Rayleigh fading wireless relay channel where communication is constrained by delay and average power limitations. Assuming partial channel state information at the transmitters and perfect channel state information at the receivers, we first study the delay-limited capacity of this system and show that, contrary to a single source-single destination case, a non-zero delay-limited capacity is achievable. We introduce opportunistic decode-and-forward (ODF) protocol which utilizes
more » ... relay depending on the channel state. Opportunistic cooperation considerably improves the delay-limited capacity of the system and performs very close to the half-duplex upper bound. We also consider the system performance in terms of minimum outage probability. We show that ODF provides performance close to the half-duplex bound from the outage probability perspective as well. Our results emphasize the importance of feedback for cooperative systems that have delay sensitive applications.
doi:10.1109/twc.2007.348341 fatcat:2elshfwvgvekldkreit5gwp2e4