I. Introduction
The ever-growing demand for wireless communication and limited radio frequency (RF) spectrum has led to spectral congestion and has initiated interest in higher frequency bands for communications. In particular, optical wireless communication (OWC) is a promising candidate to address the RF congestion problem as it considers the broad unregulated light spectrum. Due to the confinement of OWC signals by opaque boundaries, such links are particularly interesting in secure, dense indoor deployments such as the Internet-of-Things (IoT). More recently, OWC links have been realized by leveraging the widespread use of light-emitting diodes (LEDs) in solid-state lighting (SSL) applications to realize visible light communications (VLC) which imperceptibly modulates LEDs to simultaneously illuminate and provide connectivity [1], [2], [3].