Physical Layer Security with MIMO-Generalized Space Shift Keying Modulation Technique in Li-Fi Systems

Abstract: In recent years, the demand for secure, high-speed wireless communication has surged with Visible Light Communication (VLC) systems, particularly Light Fidelity (Li Fi), emerging as a promising solution. Unlike traditional radio-frequency (RF) communications, VLC utilizes the visible spectrum to transmit data, offering bandwidth, security, and interference advantages. However, ensuring the confidentiality of the transmitted data against potential eavesdroppers remains a significant challenge. In this study, a physical layer security algorithm based on generalized space shift keying (GSSK) modulation for visible light communication (VLC) systems has been developed. Initially, the algorithm selects the most suitable index combinations for ideally activating the photodiodes (PD) in the receiver through a designed linear encoder, thereby enhancing error correction capabilities. Subsequently, a customized precoding matrix is developed using this index information and the channel state information (CSI) to provide an optimum bit error rate (BER) for the legitimate receiver, Bob. This approach also degrades the BER performance of the illegitimate receiver, Eve, thus ensuring high-level security at the physical layer in Li Fi systems. Experiments conducted with Monte-Carlo simulations demonstrate the effectiveness of this methodology for scenarios requiring secure communication.

Speaker Biography: Sümeyra Hassan distinguished herself by graduating with the highest honors in her department, earning a Bachelor of Science in Electrical and Electronics Engineering from Kadir Has University in 2019. She continued her academic journey at the same institution, securing a Master of Science in Electronics Engineering in 2021. She is currently a PhD student at Kadir Has University. She is involved in the TÜBİTAK-NSF Bilateral Cooperation Program, focusing on the “Nonlinear and Inseparable Radar and Data (NIRAD) Transmission Framework for Pareto Efficient Spectrum Access in Future Wireless Networks.” with Emeritus Prof. Dr. Erdal Panayırcı. Her research interests span Telecommunications, Physical Layer Security, Optical Communication, and Visible Light Communication.