Secrecy and Efficiency in Overlay Cognitive Full-duplex Wireless Networks

In this paper, we proposed a new collaboration-based transmission scheme for overlay cognitive full-duplex wireless wiretap networks, where a full-duplex transmitter can help the primary system transmit information and utilizes the licensed spectrum to transmit its own information. In order to analyze the performance of the proposed scheme, we derive the exact secrecy outage probability expression of primary information transmission and the effective throughput of secondary information transmission. From the simulation results, we can conclude that the proposed scheme can effectively improve the secrecy performance of primary transmission and throughput of secondary transmission without any other additional power.