Novel joint secure resource allocation optimization for full-duplex relay networks with cooperative jamming

In this paper, a novel joint secure resource allocation optimization is proposed for full-duplex (FD) relay networks with cooperative jamming (CJ) in the presence of multiple source-destination (SD) pairs and an eavesdropper. We first derive the expression of the secrecy capacity for a single FD relay link with CJ. Then the joint power allocation and relay subchannel assignment (JPARA) optimization is proposed to maximize the sum secrecy capacity of the network. The proposed optimization is evaluated by numerical results, which prove that significant performance gain can be achieved by full-duplex relays when the self-interference is well suppressed. Besides, the cooperative jamming scheme is shown to improve the throughput effectively in the FD mode, while higher gap tends to be achieved by CJ in the HD mode.