关键词: 全双工, 最优中继选择, 信道估计误差, 保密中断概率

Abstract:

In view of the fact that most of physical layer security research does not consider the impact of channel estimation error on security performance at present, a full-duplex two-way relay network security performance based on imperfect Channel State Information（CSI） is studied. It is assumed that there are no direct links between users in the system at first, and that CSI cannot be obtained. The optimal relay selection scheme is adopted, and the expressions of system security capacity and Secrecy Outage Probability（SOP） are derived according to the principle of maximum and minimum. Further, the main factors affecting the secrecy performance of the system are analyzed, and the performance difference between full-duplex and half-duplex systems is compared. The simulation results show that the system secrecy performance is best when the relay node is at the midpoint between users. Meanwhile, reducing the channel estimation error, the average signal-to-noise ratio of the eavesdropping link and the residual self-interference can effectively reduce the system SOP, and appropriately increasing the number of relays can obtain better security performance.

Key words: full-duplex, optimal relay selection, channel estimation error, Secrecy Outage Probability（SOP）