Optical IRS for Visible Light Communication: Modeling, Design, and Open Issues

TL;DR

This paper reviews the use of optical intelligent reflecting surfaces (OIRS) in visible light communication, focusing on modeling, design techniques, and open challenges to improve indoor VLC coverage and reliability.

Contribution

It provides a comprehensive overview of OIRS for VLC, including new channel models, design strategies, and identifies key open issues for future research.

Findings

Comparison of optics and association channel models

Design techniques for beam alignment and reflection optimization

Identification of open challenges in OIRS-aided VLC

Abstract

Optical intelligent reflecting surface (OIRS) offers a new and effective approach to resolving the line-of-sight blockage issue in visible light communication (VLC) by enabling redirection of light to bypass obstacles, thereby dramatically enhancing indoor VLC coverage and reliability. This article provides a comprehensive overview of OIRS for VLC, including channel modeling, design techniques, and open issues. First, we present the characteristics of OIRS-reflected channels and introduce two practical models, namely, optics model and association model, which are then compared in terms of applicable conditions, configuration methods, and channel parameters. Next, under the more practically appealing association model, we discuss the main design techniques for OIRS-aided VLC systems, including beam alignment, channel estimation, and OIRS reflection optimization. Finally, open issues are identified to stimulate future research in this area.