Physical Layer Security of Hybrid Millimeter-Wave and Free-Space Optical Systems for 5G and Beyond Networks
Loading...
Date
2021-12-02
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Abstract
Wireless communication technologies have evolved significantly over the past decades. The explosive growth of the wireless communications market is predicted to continue in the future, with the increasing demand for all types of wireless services. Besides providing higher data rates in comparison with previous technologies, next-generation wireless networks are expected to have advanced capabilities such as ultra-low latency, high reliability, interoperability, efficient spectrum utilization along with a wide variety of applications over various domains, e.g., public safety and military, aeronautical networks, femtocells, etc.
On the other hand, security flaws have also been serious problems in the community of wireless communications. The information-theoretic security of wireless communications goes long way back to 1949, Shannon's leading work, in which a random secret key is shared to secure the communication between a legitimate pair in the presence of an eavesdropper. After many years, Wyner presented his model, aka the wiretap channel, where the fading channel impairments take place to secure the communication in the physical layer without the need for a secret key. Since then, the interest in wiretap channels has remarkably increased and also extended to other systems.
Therefore, considering the quality of service (QoS) requirements of 5G and beyond networks, hybrid Free-Space Optical (FSO) and millimeter Wave (mmWave) systems have emerged as a promising remedy due to the unique complementary properties against the different channel and environmental conditions. Consequently, in this dissertation, hybrid FSO-mmWave systems are investigated from a physical-layer security point of view in the presence of different types of eavesdroppers, where the communication between two legitimate peers takes place over both FSO and mmWave links simultaneously. Practical scenarios are examined to eavesdrop on the legitimate communication, and the effects of random radio power of mmWave links and optical irradiance of FSO links are discussed on the probability of achieving a secure transmission. The impact of fundamental physical layer parameters on the secrecy performance of the hybrid system is analyzed by obtaining analytical derivations of several performance metrics.
Description
Keywords
Physical Layer Security, Free Space Optical(FSO), Radio Frequency (RF), Hybrid FSO-RF Systems, 5G and Beyond