Browsing by Author "Kebapci, Burak"

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    Conference paperPublicationMetadata only
    A custom-design atmospheric channel emulator for the performance evaluation of free space optical communication systems
    (IEEE, 2017) Kebapci, Burak; Miramirkhani, Farshad; Nouri, Hatef; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Kebapci, Burak; Miramirkhani, Farshad; Nouri, Hatef
    In this paper, we present our custom design atmospheric channel emulator for free space optical (FSO) system evaluations in a controlled environment. Our emulator is in the form of an atmospheric chamber with dimensions of 60 cm × 40 cm × 300 cm. It is equipped with adjustable heaters, coolers and fans to create the turbulence. It also houses a fog generator and droplet watering system to generate different weather conditions. Using this custom-design emulator, we experimentally investigate the performance of FSO links at different wavelengths in fog conditions.
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    PhD DissertationPublicationMetadata only
    Enabling techniques for next generation secure underwater optical communications
    Kebapci, Burak; Uysal, Murat; Uysal, Murat; Durak, Kadir; Edemen, Çağatay; Levent, V. E.; Erdoğan, E.; Department of Electrical and Electronics Engineering
    As threats in the maritime domain diversify, securing data transmission becomes critical for underwater wireless networks designed for the surveillance of critical infrastructure and maritime border protection. This has sparked interest in underwater Quantum Key Distribution (QKD). In this study, a fully functional BB84 QKD system is developed as a solution to emerging security need of underwater wireless communication systems. The QKD unit is built on a hybrid computation system consisting of an Field Programmable Gate Array (FPGA) and an on-board computer (OBC) interfaced with optical front-ends. A real-time photon counting module is implemented on FPGA. The transmitter and receiver units are powered with external UPS and all system parameters can be monitored from the connected computers. The system is equipped with a visible laser and an alignment indicator to validate successful manual alignment. Secure key distribution at a rate of 100 qubits per second was successfully tested over a link distance of 7 meters.
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    Poster: on-board camera video transmission over vehicular VLC
    (IEEE, 2017) Narmanlioglu, Omer; Turan, B.; Kebapci, Burak; Coleri Ergen, S.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Narmanlioglu, Omer; Kebapci, Burak
    Vehicular connectivity is envisaged to extend vehicle on-board camera videos to the nearby vehicles in order to increase drivers' road awareness. This paper demonstrates the possibilities of video transmission captured by vehicle on-board forward-looking camera via visible light communications (VLC) using taillights to provide see-beyond the front vehicle assistance. Line of sight (LoS) inter-vehicular video transmission using direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) based VLC with the data rate of 6.42 Mbps and lower latency than 32 msec is validated through experiments.