Browsing by Author "Levent, V. E."

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FPGA based DCO-OFDM PHY transceiver for VLC systems
(IEEE, 2019) Levent, V. E.; Sağlam, Gürol; Uğurdağ, Hasan Fatih; Annafianto, Nur Fajar Rizqi; Aydın, Furkan; Tesfay, Shewit Weldu; Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Kebapçı, Burak; Uysal, Murat; Electrical & Electronics Engineering; UĞURDAĞ, Hasan Fatih; UYSAL, Murat; Sağlam, Gürol; Annafianto, Nur Fajar Rizqi; Aydın, Furkan; Tesfay, Shewit Weldu; Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Kebapçı, Burak
Satisfying the demand for high bandwidth and low latency in Visible Light Communication (VLC) systems is a difficult challenge. VLC channels exhibit frequency-selectiveness at peak-speeds. This phenomenon generates a serious inter-symbol interference effect. A physical layer (PHY) design that can carry out physical layer communication tasks to overcome all these strains is required. In this study, an FPGA based PHY design that implements DCO-OFDM algorithm is described for VLC systems. A demo was performed with the developed PHY design using an LED transmitter and a photodetector receiver.
Open Access
FPGA-based implementation of an underwater quantum key distribution system with BB84 protocol
(IEEE, 2023-08) Kebapçı, B.; Levent, V. E.; Ergin, S.; Mutlu, Görkem; Bağlıca, İbrahim; Tosun, A.; Paglierani, P.; Pelekanakis, K.; Petroccia, R.; Alves, J.; Uysal, Murat; Electrical & Electronics Engineering; UYSAL, Murat; Bağlıca, İbrahim
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 paper, we present an FPGA-based real-time implementation of an underwater QKD system based on the BB84 protocol. The QKD unit is built on a hybrid computation system consisting of an 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.
Metadata only
Real-time implementation of an underwater quantum key distribution system
(IEEE, 2022) Kebapçı, B.; Mutlu, Görkem; Bağlıca, İbrahim; Tosun, A.; Ergin, S.; Levent, V. E.; Uysal, Murat; Paglierani, P.; Pelekanakis, K.; Petroccia, R.; Alves, J.; Electrical & Electronics Engineering; UYSAL, Murat; Bağlıca, İbrahim
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 paper, we present a real-time implementation of an underwater QKD system based on the BB84 protocol. The QKD unit is built on a hybrid computation system consisting of an FPGA and an on-board computer (OBC) interfaced with optical front-ends. A real-time photon counting module has been 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 also equipped with a visible laser and an alignment indicator to validate successful manual alignment.