Secrecy Outage Analysis of Full Duplex Cellular Multiuser Two-Way AF Relay Networks

In this paper, we investigate the secrecy outage performance of a full-duplex cellular multiuser two-way amplify-and-forward relay network, where a multiantenna base station communicates with one of the several users by the assistance of a relay in the presence of a passive eavesdropper. Specifically, we first formulate the instantaneous end-to-end signal-to-interference-plus-noise ratio (SINR) by employing antenna selection transmission scheme at the BS with user scheduling. Further, by considering the maximal ratio combining scheme at the eavesdropper, the SINR of the wiretap links is also evaluated. Based on the above formulations, we derive the closed-form expression of secrecy outage probability (SOP) for the considered system. Our results reveal that the SOP performance can be improved if the number of antennas at the BS and/or number of users increases. It is also shown that the residual self interference can severely degrade the SOP, and even SOP reaches an error floor for larger transmit power. Finally, the numerical and simulation results corroborate our theoretical findings.