Selfish behavior detection of cooperative relay

A selfish behavior detection technique is investigated to assist secure cooperative transmission at the physical layer. The detection technique calculates the correlation ratio between signals received from the diversity branches to determine the relay's behavior in amplify and forward cooperation strategy. The correlation ratio is considerably reduced because the relay's selfish behavior makes the correlation between the received signals in the diversity branch degraded. Simulation results show that the proposed mechanism can effectively detect selfish nodes and performance will be improved significantly with the destination's detection technique.