A Best Relay Selection Scheme Based on Cooperative Communication
XU Yi-biao · Information Security and Communications Privacy · 2010
Opportunistic relaying uses a single relay with best channel quality for cooperative diversity, achieves the same diversity gain as that achieved by more complex space-time coding. However, the failure probability of the best relay selection may become unacceptable when the number of relays increases. Thus a modified practical best relay selection scheme is proposed by using threshold level to restrict the numbers of contending relays and using control channel in opportunistic relay communications. Simulation results show that the proposed algorithm has smaller collision probability than opportunistic relaying, and could decrease failure probability of selection while realize the rapid selection of relay nodes.