Max-min relay selection for legacy amplify-and-forward systems with interference
IEEE Transactions on Wireless Communications
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
On the performance of cooperative-diversity networks with the Nth best-relay selection scheme
IEEE Transactions on Communications
Superposition coding cooperative relaying communications: Outage performance analysis
International Journal of Communication Systems
Distributed space-time-coded protocols for exploiting cooperative diversity in wireless networks
IEEE Transactions on Information Theory
Cooperative diversity in wireless networks: Efficient protocols and outage behavior
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
A simple Cooperative diversity method based on network path selection
IEEE Journal on Selected Areas in Communications
More Accurate ASER Bound for Opportunistic Amplify-and-Forward Relay Systems
Wireless Personal Communications: An International Journal
Wireless Personal Communications: An International Journal
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To overcome the loss in the outage probability and symbol error ratio (SER) caused by the Nth single relay opportunistic relaying (OR), in this paper, we present the N---Rth dual best relays OR schemes in which there are two relays selected out of the available relays to forward the received signals to destination over orthogonal channels by using amplify-and-forward protocols. For the proposed N---Rth OR schemes, we obtain firstly the closed-form expressions to the probability density function (PDF) and cumulative distribution function of the instantaneous end-to-end signal-to-noise ratio (SNR) by using the appropriate mathematical manipulations over independent and non-identically distributed Rayleigh fading channels. Then, based on the derived statistical descriptions, the outage probability, average SER, and ergodic capacity of the proposed dual relays OR schemes are investigated as well as the corresponding closed-form analytical solutions. The fair comparison analyses between the Nth schemes and the N---Rth schemes show that the proposed N---Rth schemes can improve greatly the outage probability and average SER of the considered OR schemes in medium and high power transmission regions (or SNR). Especially, the proposed dual relays OR schemes can provide more improvement on SER than outage probability. At the same time, the presented numerical results indicate clearly the improvement on the outage probability and average SER is at the price of the loss in the ergodic capacity, which is due to the constrain of diversity and multiplexing tradeoff in cooperative communications.