Security-Reliability Tradeoff for Secure Relaying Systems With Full-Duplex Radio

This paper focuses on how to effectively improve the tradeoff between security and reliability by developing power allocation problems for a secure relaying network with a full-duplex (FD) relay, an FD receiver and a passive eavesdropper. FD radio here is utilized for cooperative jamming. The security and reliability are characterized by the secrecy rate and the data rate, respectively. The total transmit power is divided into two parts: one for data transmission and the other for jamming. The power allocation problem is split into data rate optimization and secrecy rate optimization, which will greatly simplify the tradeoff process. Closed-form solutions of the two subproblems are obtained. By applying these results, a security-reliability tradeoff strategy is proposed. Numerical results have shown that the proposed security-reliability tradeoff strategy can approach the Pareto optimal front. Using the strategy, one can make the tradeoff between security and reliability efficiently by adjusting only one tradeoff factor.