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.
|Original language||English (US)|
|Title of host publication||2nd 6G Wireless Summit (6G SUMMIT)|
|State||Published - 2020|
Bibliographical noteKAUST Repository Item: Exported on 2022-06-24
Acknowledged KAUST grant number(s): OSR-2016-CRG5-2958-02
Acknowledgements: This work was supported by the Scientific and Technical Research Council of Turkey (TUBITAK) under the 1003-Priority Areas R&D Projects support Program No. 218E034 and in part by KAUST under Grant No. OSR-2016-CRG5-2958-02. A. Yesilkaya acknowledges the financial support from Zodiac Inflight Innovations (TriaGnoSys GmbH). H. Haas acknowledges support from the EPSRC under Established Career Fellowship Grant EP/R007101/1. He also acknowledges the financial support of his research by the Wolfson Foundation and the Royal Society.
This publication acknowledges KAUST support, but has no KAUST affiliated authors.