On Physical Layer Security of Double Shadowed Rician Fading Channels

With the proliferation of fifth-generation (5G) mobile communication wireless networks, the investigation into the performance of physical layer secrecy is increasingly becoming the center of attention of recent studies. Physical layer security (PLS) is the pivotal notion of enhancing the secrecy of mobile communication wireless networks against eavesdropping by utilizing the intrinsic randomness of the wireless channel. In this study, we focus on the information-theoretic secrecy perspective in which authorized users convey their information to each other through a quasi-static channel and adversary users are obtaining this secret information through illegitimate wiretap quasi-static channel, where it is assumed that all the channels are represented as double shadowed Rician distributed. In this context, analytical solutions for the expressions of various physical layer secrecy metrics include the strictly positive secrecy capacity (SPSC) and the lower bound on secure outage probability (SOP^L) are procured in closed-form. In addition, another physical layer secrecy metric, i.e., average secrecy capacity (ASC) is also investigated and determined in analytical closed-form. The effect of double shadowing on the performance of PLS is investigated. It is found that severer shadowing improves the secrecy performance. Our results also show that the legitimate users can communicate secretly when the legitimate channel link is superior to illegitimate channel link.