Vol.4 No.6 (December 2014)
A New Relay Selection Strategy under Interference Temperature Constraint
One of the key problems in cooperative communication is how to allocate and manage the relay nodes, especially in the secondary user system under the interference temperature constraint. The design of the collaborative scheme should not only maximize the performance of the system, but also need to control the secondary user system’s interference in the primary user system. For this situation, a relay selection strategy is proposed based on the collaborative beamforming in the secondary user system. To minimize the outage probability of the secondary user system, a threshold is determined which only allocates the transmission power to the efficient relay links to improve the transfer performance of the system. The simulation results demonstrate that the proposed strategy can effectively reduce the outage probability of the secondary user system, and more over, it is better than the Single Relay Amplify-and-Forward (SAF) scheme and the All Relays Amplify-and-Forward (AAF) scheme.
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