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Mayıs 05, 2021 - Mayıs 11, 2021
Dissertation Defense - Muhammet Selim Demir (PHDEE)
Muhammet Selim Demir - Ph.D
Prof. Murat Uysal – Advisor
Date: 11.05.2021
Time: 10:00
Location: This meeting will be held ONLINE. Please send an e-mail to gizem.bakir@ozyegin.edu.tr in order to participate in this defense.
Thesis Committee:
Prof. Murat Uysal, Özyeğin University
Prof. Hasan Fatih Uğurdağ, Özyeğin University
Assoc. Prof. Hacı İlhan, Yıldız Technical University
Prof. Sinem Çöleri, Koç University
Prof. İbrahim Altunbaş, İstanbul Technical University
Mobility Management and Resource Allocation Strategies for
Visible Light Communication Networks
Abstract:
There has been a growing interest on visible light communications (VLC) in recent years. The existing works in the literature on point-to-point VLC systems are well established and especially the studies on physical layer aspects demonstrate the potential of VLC. However, in order to transform VLC to a multi-user, multi-cell, scalable, and fully networked wireless technology significant further efforts on upper layer issues are needed. This dissertation focuses on mobility management and resource allocation techniques for indoor and vehicular VLC systems.
In the first part of this thesis, we consider a centralized direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) based VLC network and formulate a subcarrier resource allocation problem to maximize the user satisfaction index. For the solution of the resulting problem, we used the bio-inspired particle swarm optimization (PSO) method. In the second part of this thesis, we propose an energy-efficient dynamic resource management framework for indoor orthogonal frequency division multiplexing (OFDM) based VLC networks. Specifically, we formulate and investigate a stochastic cross-layer optimization problem to seemly optimize the network resources under the constraints of queue stability and power to maximize the average system throughput. In the last part of this thesis, we propose handover algorithms for indoor and outdoor VLC networks. First, we propose a handover algorithm for indoor VLC networks with coordinated multipoint (CoMP) transmission and evaluate its performance in physical channel settings based on ray tracing. Then, we present a dynamic soft handover algorithm for outdoor vehicular VLC networks.
Bio:
M. Selim Demir received the B.Sc. degree in Telecommunication Engineering from Istanbul Technical University, Istanbul, Turkey, in 2007 and the M.Sc. degree in Electrical Engineering from University of Columbia, New York, USA, in 2010. He
is currently pursuing the Ph.D. degree under the supervision of Prof. Murat Uysal at Özyeğin University, Istanbul, Turkey. Since 2011, he has been a researcher at TUBITAK BILGEM. His research interests include optical wireless communications,
visible light communications, wireless mobile networks, and deterministic networks.
M. Selim Demir received the B.Sc. degree in Telecommunication Engineering from Istanbul Technical University, Istanbul, Turkey, in 2007 and the M.Sc. degree in Electrical Engineering from University of Columbia, New York, USA, in 2010. He
is currently pursuing the Ph.D. degree under the supervision of Prof. Murat Uysal at Özyeğin University, Istanbul, Turkey. Since 2011, he has been a researcher at TUBITAK BILGEM. His research interests include optical wireless communications,
visible light communications, wireless mobile networks, and deterministic networks.