Relay Selection for Secure Successive AF Relaying Networks With Untrusted Nodes

摘要: In this paper, the security aspect of an amplify-and-forward relaying network with untrusted relay nodes is considered. The can help to forward received signal and they may also try decode such information, which be regarded as potential eavesdroppers (Eves). To deal a challenging issue, successive scheme adopted, where multi-antenna source transmits two selected alternately, conventional detrimental inter-relay interference used jam without external helpers. Considering different complexity requirements, several selection schemes are proposed, closed-form expressions lower bound secrecy outage probability derived accordingly. obtain some insights for design, asymptotic analysis given, shows that maximum diversity order $N-1$ achieved, $N$ number relays. Moreover, spectral efficiency improved dramatically scheme. Simulation results show proposed max–min has almost same performance optimal one, theoretical match well simulation results.