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Physical Layer Security in mmWave Wireless Communication Systems

Qianyue Qu

Published Mar 31, 2025• 0 citations
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Physical layer security is one of the trending research areas in tackling data security issues of wireless networks. The main focus of this work is to explore practically the possibilities and performance of secret key generation solutions exploiting wireless channel randomness. This paper describes the implementation of a real-time secure key generation algorithm in a 60 GHz millimetre wave (mmWave) communication system. The performance of the algorithm is evaluated systematically for different parameter combinations to find the optimal parameter values for the system in an indoor static office environment.
Hybrid Free-Space Optical (FSO) and millimeter Wave (mmWave) systems have emerged as a promising candidate for high data rate wireless transmissions due to the unique complementary properties against the different channel and environment conditions. Consequently, in this study, we investigate the hybrid FSO-mmWave systems from a physical-layer security point of view in the presence of a hybrid type eavesdropper, where the communication between two legitimate peers takes place over both FSO and RF links simultaneously. We examine practical scenarios to eavesdrop the legitimate communication and discuss the effects of random radio power of mmWave link and optical irradiance of FSO link on the probability of achieving a secure transmission. The impact of the fundamental physical layer parameters on the secrecy performance of the hybrid system is analyzed by obtaining closed-form derivations of the probability of strictly positive secrecy capacity (SPSC) for correlated wiretap channels.