Physical Layer Security Performance of MIMO RF/FSO System Based on $\kappa-\mu$/EW Distribution under the Effect of CCI

This paper presents the research of physical layer security performance of multiple-input multiple-output (MIMO) radio frequency-free space optical (RF -FSO) system based onk-µ/ Exponentiated Weibull (EW) distribution under the effect of co-channel interference (CCI). The RF links undergo the k-µ fading, and the FSO link experiences the EW distribution. The system consists of an RF source (S) with multiple antennas, a two-hop decode-and-forward (DF) relay (R) with multiple receptions is affected by CCI and there are N eavesdroppers. The influence of various key factors on the safety performance of the system is analyzed by simulations. The results show that when the influence of CCI is considered, the safety performance of the system is significantly reduced, and as the interference-to-noise ratio (INR) increases, the safety performance becomes worse. Increasing the number of antennas at the transmitting end and the receiving end of the relay have a certain effect on the safety performance of the system. When the number of eavesdroppers increases, the security performance of the system deteriorates. It provides a good theoretical basis for the research on the physical layer security performance of the mixed RF/FSO system, provides a good reference value for the actual impact and solutions that may occur in the engineering application process.