Thesis Defense - Sadi Safaraliev (MSEE)

Sadi Safaraliev- M.Sc. Electrical Electronics Engineering

Prof. Murat Uysal- Advisor

LIGHTING DESIGN CONSIDERATIONS AND CHANNEL MODELING FOR VISIBLE LIGHT COMMUNICATIONS

Date: 10.06.2019

Time: 10:00

Location: AB2 G16

Thesis Committee: 

Prof. Murat Uysal,  Özyeğin University

Asst. Prof. Ahmet Tekin,  Özyeğin University

 Asst. Prof. Tunçer Baykaş, Medipol University

Abstract

There has been extensive work on visible light communication (VLC) mainly due to scarcity in radio frequency (RF) spectrum and an urgent need for a new wireless communication system in the near future. VLC considers the dual use of LED luminaires as the light sources for illumination as well as signal sources for wireless communication applications. However, to the best of our knowledge, the existing works mainly overlook lighting design considerations which might have significant effects on the performance of VLC systems. In addition, there is a lack of proper VLC channel models which take into account wiring and cabling topologies.

In the first part of this thesis, we discuss some main indoor lighting design considerations and their implications for VLC applications. In particular, we consider some practical cabling topologies of LED luminaires and wiring topologies of LED chips within the luminaires. Based on non-sequential ray tracing, we obtain channel impulse responses (CIRs) and quantify the impact of cabling and wiring delays.

In the second part of the thesis, we consider outdoor applications of VLC. We first discuss outdoor lighting design considerations and their possible implications on VLC system design. Based on the ray-tracing approach, we obtain CIRs for an infrastructure-to-pedestrian (I2P) outdoor VLC scenario. Using these CIRs, we calculate channel DC gain, path loss, root mean square (RMS) delay spread and mean excess delay values.

Bio

Sadi Safaraliev received the B.Sc. degree in Physics from Middle East Technical University, Ankara, Turkey, in 2014, where he mainly concentrated on Optics and Optoelectronics. He enrolled as a graduate student in Electrical and Electronics Engineering Department at Ozyegin University in January 2016, Istanbul, Turkey, working toward his M.Sc. degree under the supervision of Prof. Murat Uysal. He received his M.Sc. degree in Electrical and Electronics Engineering in June 2019. His academic research interests include optics, optoelectronics, VLC, and channel modeling.

Sadi is currently a Senior Optical Design Engineer at Vestel Electronics Corp., Manisa, Turkey, since October 2014, where he is mainly responsible for optical design, tests and verification of lighting products, including designing of optical components (e.g., reflectors and lenses), benchmarking, and researching new products. His main professional fields of interest are LED lighting, automotive lighting, imaging and non-imaging optics, holographic displays and VLC.