Thesis Defense – Zeynep Özbilgin (MSEE)

Zeynep Özbilgin – M.Sc. in Electrical and Electronics Engineering  

Prof. Murat Uysal – Advisor

Date: 21.05.2024

Time: 11.00

Location: AB1 238

EFFECT OF PHASE NOISE ON THE PERFORMANCE OF COHERENT VISIBLE LIGHT COMMUNICATION SYSTEMS

 Prof. Murat Uysal, Özyeğin University

Asst. Prof. Çağatay Edemen, Özyeğin University

Assoc. Prof. Eylem Erdoğan, Izmir Institue of Technology

Abstract:

Visible light communication (VLC) builds upon the dual use of illumination infrastructure for wireless access. The recent commercialization of laser diode (LD)–empowered white light luminaires gives the opportunity to build coherent VLC systems. Coherent VLC systems can leverage the high bandwidth of lasers and advanced digital signal processing techniques to significantly improve the data rates. For coherent reception, a local oscillator in the form of a monochromatic laser is used. In practice, lasers suffer from random fluctuations in phase due to spontaneous emission and carrier density fluctuations. In this paper, we analyze the effects of phase noise on the performance of a coherent VLC system. We assume that a phase locked loop (PLL) is used for phase recovery. Based on the statistical distribution of the residual phase, we derive an approximate closed-form expression for the pairwise error probability (PEP) which is then used to obtain a union bound on the error rate. Through comprehensive simulations, we validate the accuracy of the derived expression and quantify the impact of phase noise on the error rate performance.

Bio:

Zeynep Ozbilgin obtained her Bachelor's degree in Electrical and Electronics Engineering with high honors from Istanbul Medipol University in June 2022. Following August, she entered Ozyegin University for Master of Science degree in Electrical and Electronics Engineering. She is currently working in communication systems engineering with the Communication Theory and Technologies (CT&T) Research Group at the Ozyegin University, Istanbul, Turkey. Her main research interests include wireless communication, coherent visible light communication, and deep learning.