Wireless Communications: Principles and Practice
Wireless Communications: Principles and Practice
On Limits of Wireless Communications in a Fading Environment when UsingMultiple Antennas
Wireless Personal Communications: An International Journal
Diversity through coded cooperation
IEEE Transactions on Wireless Communications
IEEE Transactions on Information Theory
Space-time block codes from orthogonal designs
IEEE Transactions on Information Theory
Evaluating the performance of convolutional codes over block fading channels
IEEE Transactions on Information Theory
On coding for block fading channels
IEEE Transactions on Information Theory
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
Space-time diversity enhancements using collaborative communications
IEEE Transactions on Information Theory
Outage analysis of coded cooperation
IEEE Transactions on Information Theory
Variable-Rate Two-Phase Collaborative Communication Protocols for Wireless Networks
IEEE Transactions on Information Theory
A simple transmit diversity technique for wireless communications
IEEE Journal on Selected Areas in Communications
Energy-efficiency of MIMO and cooperative MIMO techniques in sensor networks
IEEE Journal on Selected Areas in Communications
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Recent results have shown that it is possible to obtain the diversity advantages promised by multiple transmit/ receive antennas through the use of collaboration. Collaboration entails having a source wishing to communicate to a destination with the help of a relay. Two-phase protocols have been developed to provide collaboration in wireless networks. Previous work has assumed a fixed amount of time spent in each phase of communication. Following the results of [15], in this paper we have proposed and studied a variable time-fraction collaborative communication protocol. We provide guidelines for the construction of codes with better performance than the use of traditional Space-Time codes in the collaborative phase. We also provide an analysis of the upper bound on FER of the proposed scheme. Analytical as well as simulated results reveal the advantages of using a variable time-fraction over a fixed time-fraction. The results also show that for any relay location, the variable time-fraction protocol will perform at least as well as the fixed time-fraction protocol. Therefore, unlike with fixed time-fraction, there is no need for a relay to select an optimal time-fraction based on its relative position with respect to the source and destination.