Physical-layer security in visible light communications

Anil Yesilkaya, Tezcan Cogalan, Serhat Erkucuk, Yalcin Sadi, Erdal Panayirci, Harald Haas, H. Vincent Poor

Research output: Chapter in Book/Report/Conference proceedingConference contribution

26 Scopus citations


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 languageEnglish (US)
Title of host publication2nd 6G Wireless Summit 2020
Subtitle of host publicationGain Edge for the 6G Era, 6G SUMMIT 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781728160474
StatePublished - Mar 2020
Externally publishedYes
Event2nd 6G Wireless Summit, 6G SUMMIT 2020 - Levi, Lapland, Finland
Duration: Mar 17 2020Mar 20 2020

Publication series

Name2nd 6G Wireless Summit 2020: Gain Edge for the 6G Era, 6G SUMMIT 2020


Conference2nd 6G Wireless Summit, 6G SUMMIT 2020
CityLevi, Lapland

All Science Journal Classification (ASJC) codes

  • Artificial Intelligence
  • Hardware and Architecture
  • Signal Processing
  • Safety, Risk, Reliability and Quality
  • Computer Networks and Communications
  • Instrumentation


  • Generalized space shift keying (GSSK)
  • Non-orthogonal multiple access (NOMA)
  • Physical-layer security
  • Visible light communications (VLC)


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