Physical-layer security in visible light communications
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Date
2020
Authors
Çoğalan, Tezcan
Erküçük, Serhat
Şadi, Yalçın
Panayırcı, Erdal
Haas, Harald
Poor, Harold Vincent
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Institute of Electrical and Electronics Engineers Inc.
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Abstract
Optical wireless communications (OWC) and its potential to solve physical layer security (PLS) issues are becoming important research areas in 6G communications systems. In this paper, an overview of PLS in visible light communications (VLC), is presented. Then, two new PLS techniques based on generalized space shift keying (GSSK) modulation with spatial constellation design (SCD) and non-orthogonal multiple access (NOMA) cooperative relaying are introduced. In the first technique, the PLS of the system is enhanced by the appropriate selection of a precoding matrix for randomly activated light emitting diodes (LEDs). With the aid of a legitimate user's (Bob's) channel state information (CSI) at the transmitter (CSIT), the bit error ratio (BER) of Bob is minimized while the BER performance of the potential eavesdroppers (Eves) is significantly degraded. In the second technique, superposition coding with uniform signaling is used at the transmitter and relays. The design of secure beamforming vectors at the relay nodes along with NOMA techniques is used to enhance PLS in a VLC system. Insights gained from the improved security levels of the proposed techniques are used to discuss how PLS can be further improved in future generation communication systems by using VLC.
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Keywords
Generalized space shift keying (GSSK), Non-orthogonal multiple access (NOMA), Physical-layer security, Visible light communications (VLC)
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18
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