Hybrid free-space optical (FSO) and millimeter wave (mmWave) systems have been proposed as an efficient solution to improve spectral efficiency maintain link reliability. The comparable supported data rate the complementary characteristics in different weather conditions of both links, i.e., FSO mmWave) attracted research efforts towards analyzing performance aspects hybrid FSO-mmWave systems. ...

A novel digital signal processing (DSP)-based scheme for physical layer security in coherent optical communication systems is proposed and numerically investigated. The encryption accomplished by two dispersive elements one phase modulator (PM) driven a DSP-generated key, whilst decryption uses similar components but with inverted dispersion values keys. critical aspect of the DSP-based that ke...

This article highlights challenges associated with securing visible light communication (VLC) systems by using physical layer security (PLS) techniques. Motivated the achievements in PLS studies for radio frequency (RF) communication, many techniques VLC were also rigorously investigated tailoring RF to environment. However, careful consideration of inherent differences between and is still nee...

This work investigates the impact of ever-present electromagnetic interference (EMI) on achievable secrecy performance reconfigurable intelligent surface (RIS)-aided communication systems. We characterize end-to-end RIS channel by considering key practical aspects such as spatial correlation, transmit beamforming vector, phase-shift noise, coexistence direct and indirect channels, presence stro...

Reconfigurable intelligent surface (RIS)-aided wireless communications have drawn significant attention recently. We study the physical layer security of downlink RIS-aided transmission framework for randomly located users in presence a multi-antenna eavesdropper. To show advantages networks, we consider two practical scenarios: Communication with and without RIS. In both cases, apply stochasti...