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Doctorate thesis defense of Nihel Ramdhan

Doctorate thesis defense on April 26th 2021 at 09H00 ,in Sup’Com Amphitheater Ibn Khaldoun.

Entitled :VLC Integration in 5G Networks: Modeling, Techniques and Applications

Presented by :Nihel Ramdhan


President :

Mr. Pr. Fethi Tlili

Professor, SUP’COM, University of Carthage




Reviewers :

Mr. Monia Najjar

Professor, ISI, University Tunis El Manar


Mrs. Rabah Attia

Professor, EPT, University of Carthage


Examiner :

Mr. Neji Youssef

Professor, SUP’COM, University of Carthage




Thesis Supervisor :

Mr. Noureddine Boudriga

Professor, SUP’COM, University of Carthage


Unmanned Aerial Vehicles (UAV) flying in swarm formations carrying a variety of sensors for monitoring and surveillance become increasingly popular for a wide range of scientific disciplines and applications. First, we propose an optical UAV network that allows the real time data distribution to a base station, based on multiple collection trees and multiple base stations. Each UAV is identified by an optical codeword with adequate structure to reduce the codeword management process implied by the UAV mobility. Using the attributed codewords, each UAV can optically switch the gathered data to reach a base station for processing. Furthermore, we present quality-based attachment and re-attachment procedures allowing to an UAV to attach and re-attach to a tree whether it notices the quality degradation of its link to the collection tree. Second, we propose an attack detection technique in optical UAV networks. We study a specific class of attacks that vises to insert erroneous collected data in inter-UAV FSO communication links and propose a countermeasure module allowing to protect communications in optical UAV networks against erroneous packet insertion attack. Third, we propose a Fiber Bragg Grating (FBG) sensing network for vibration monitoring. The deployed FBG network allows to estimate the vibration positions on the sensed area. Based on the performed measurements, and whether the vibration exceeds a predefined threshold, a decision can be made to reduce the vibration values. To this objective, a set of optical pulses is emitted to the deployed FBG arrays. When an external axial strain is induced, the deployed FBG reacts accordingly causing a proportional shift in the reflected wavelength. Based on the reflected optical pulse wavelength, an acquisition unit can compute the fiber displacement and consequently the average vibration in a FBG specific position. The system validation contains the parameters’ validation, the design of the optical sensing circuit and the system extensibility

Keywords :

Unmanned Aerial Vehicles, Optical networks, Security, Codeword, Vibration.