Michael Rahaim
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A Low-Cost Open-Source Testbed for Experimental Analysis of Ultra-Dense Wireless Networks Open
Network densification has been a key contributor to the performance improvements of the wireless ecosystem, particularly in terms of aggregate capacity. In other words, adding more base stations (BSs) or access points (APs) allows for spat…
Multi-Tier Heterogeneous Beam Management for Future Indoor FSO Networks Open
To meet the growing demand for wireless capacity, communications in the Terahertz (THz) and optical bands are being broadly explored. Communications within these bands provide massive bandwidth potential along with highly directional beam …
Machine learning-based security-aware spatial modulation for heterogeneous radio-optical networks Open
In this article, we propose a physical layer security (PLS) technique, namely security-aware spatial modulation (SA-SM), in a multiple-input multiple-output-based heterogeneous network, wherein both optical wireless communications and radi…
Interference in multi-user optical wireless communications systems Open
Visible light communications (VLC) (including LiFi) represent a subset of the broader field of optical wireless communications. Where narrow beams, typical of free space optical communications are largely free from interference. VLC encomp…
Interference Mitigation Through User Association and Receiver Field of View Optimization in a Multi-User Indoor Hybrid RF/VLC Illuminance-Constrained Network Open
In this paper we address interference mitigation through user association and receiver field of view (FOV) optimization in a multi-user indoor optical wireless communication (OWC) scenario. We explore several dynamic FOV receiver solutions…
Introduction to the Special Section on Coexisting Radio and Optical Wireless Deployments (CROWD) Open
We are delighted to introduce the readers to this special section of the IEEE TRANSACTIONS ON COGNITIVE COMMUNICATIONS AND NETWORKING (TCCN), which has the purpose of addressing the current state-of-the-art for research and new efficient s…
Optimizing Handover Parameters by Q-Learning for Heterogeneous Radio-Optical Networks Open
Existing literature studying the access point (AP)-user association problem of heterogeneous radio-optical networks either investigates quasi-static network selection or only considers vertical handover (VHO) dwell time from optical to rad…
Investigation of Outage Probability and AP Placement for Mobile Users in Indoor VLC System Design Open
Providing optical wireless data access with the visible spectrum is a commercial reality. Products are available for point-to-point or point-to-multipoint solutions. However, there remain many important questions about how to successfully …
Dynamic FOV visible light communications receiver for dense optical networks Open
This study explores how the field‐of‐view (FOV) of a visible light communications (VLCs) receiver can be manipulated to realise the best signal‐to‐noise ratio (SNR) while supporting device mobility and optimal access point (AP) selection. …
Visible Light Communication Module: An Open Source Extension to the ns3 Network Simulator With Real System Validation Open
The emergence of new physical media such as optical wireless and the ability to aggregate these new media with legacy networks motivate the study of heterogeneous network performance, especially with respect to the design of protocols to b…
View article: Directional visible light communication signal enhancement using a varifocal micromirror with four degrees of freedom
Directional visible light communication signal enhancement using a varifocal micromirror with four degrees of freedom Open
We present the use of a micromirror to dynamically improve an optical wireless communiciations link. The signal-to-noise ratio (SNR) is improved by directing the output of a 675 nm laser diode modulated at 10 MHz toward a receiver and by v…