Physical‐Layer Security for Optical Wireless Communications

Optical wireless communication (OWC) is a promising technology that will play a pivotal role in the next generations of wireless networks. This chapter presents a study of the physical-layer security (PLS) for OWC with a special focus on the indoor visible light communication (VLC). Some commonly adopted VLC systems, e.g., single-input–single-output (SISO), multiple-input–single-output (MISO), and multiuser VLC systems, are investigated. In addition, the PLS for VLC systems, incorporating cutting-edge technologies like machine learning techniques and intelligent reflecting surface, is also introduced.