Browsing Electrical & Electronics Engineering by Author "Uysal, Murat"
Now showing items 101-120 of 351
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Exact closed-form error probability expression for cooperative diversity networks with channel estimation errors in time selective Rayleigh fading channels
Ikki, S. S.; Al-Dharrab, S. I.; Uysal, Murat (IEEE, 2010)In this paper, we investigate the performance of a cooperative network with adaptive decode-and-forward (DF) relaying over time-selective frequency-flat Rayleigh fading channels. In adaptive DF relaying, only a subset of ... -
Experimental characterization of multi-hop vehicular VLC systems
Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Uysal, Murat (IEEE, 2021)In vehicular visible light communication (VLC), the reliable communication distance may be relatively short due to its dependence on many factors including the weather condition. This necessitates the use of relay-assisted ... -
Experimental demonstration of an FPGA-based outdoor VLC broadcasting system
Bağlıca, İbrahim; Ashfaq, Bismillah Nasir; Ergin, S.; Kebapçı, B.; Baykas, T.; Uysal, Murat (IEEE, 2023)Visible light communication (VLC) uses light-emitting diodes (LEDs) to transmit data by turning them on and off at very high speeds, too fast for the human eye to perceive. In outdoor environments, LED-based streetlights ... -
Experimental demonstration of polarisation shift keying in the free space optical turbulence channel
Tang, X.; Ghassemlooy, Z.; Rajbhandari, S.; Uysal, Murat (IEEE, 2012)In this paper, the performance of binary polarisation shift keying (BPOLSK) with the direct detection (DD) scheme is experimentally investigated. BPOLSK scheme is used to mitigate the atmospheric turbulence induced fading ... -
Experimental evaluation of a software defined visible light communication system
Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Kebapçı, Burak; Uysal, Murat (IEEE, 2020)Visible light communication (VLC) allows the dual use of light-emitting diodes (LEDs) for illumination and communication purposes. With its large bandwidth and immunity to electromagnetic interference, VLC can be used as ... -
Experimental evaluation of unipolar OFDM VLC system on software defined platform
Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Uysal, Murat; Kınav, E. (IEEE, 2019)With unique features and advantages, visible light communication (VLC) is considered as a powerful complementary wireless access technology to radio frequency solutions such as WiFi. To handle the frequency-selectivity of ... -
Experimental investigation of lens combinations on the performance of vehicular VLC
Mohamed, Bassam Aly Abdelrahman; Elamassie, Mohammed; Eldeeb, Hossıen Badr; Uysal, Murat (IEEE, 2020)With the increasing adoption of LEDs in outdoor light sources such as traffic lights, street lights and vehicle headlamps, visible light communication (VLC) has the promise to become a major enabler for vehicle-to-vehicle ... -
Experimental investigation of pointing errors on drone-based FSO systems
Tosun, Anılcan; Nouri, Hatef; Uysal, Murat (IEEE, 2020-10-05)Airborne free space optical (FSO) links can be efficiently used for backhaul/fronthaul needs of future cellular networks. Unlike terrestrial FSO links where a fixed connection between two buildings is considered, airborne ... -
Experimental investigation on the effect of wavelength on aperture averaging in FSO communications
Nouri, Hatef; Uysal, Murat (The Optical Society, 2020-06-01)Atmospheric turbulence is a major impairment in free-space optical (FSO) communication systems. Based on the fact that the size of receiver aperture is much larger than operation wavelength, aperture averaging extracts ... -
An experimental study of underwater visible light communication
Yıldız, Samet; Baǧlıca, İbrahim; Kebapçı, B.; Elamassie, Mohammed; Uysal, Murat (IEEE, 2022)Visible light communication (VLC) has emerged as a powerful high-data-rate alternative to conventional underwater acoustic technology for short and medium link distances. In this paper, we develop an experimental underwater ... -
Experimental validation of a novel RLL code for visible light communication
Yagan, M. Y.; Kısacık, Rıfat; Erkinaci, T.; Pusane, A. E.; Uysal, Murat; Baykas, T.; Dundar, G.; Yalcinkaya, A. D. (IEEE, 2020)Flicker arising in visible light communication (VLC) system is typically mitigated by run-length-limited (RLL) codes. The IEEE 802.15.7 standard proposes RLL codes according to the modulation type and data rate. In this ... -
Fast-decodable MIMO HARQ systems
Hosseini, S. S.; Abouei, J.; Uysal, Murat (IEEE, 2015-05)This paper presents a comprehensive study on the problem of decoding complexity in a Multi-Input Multi-Output (MIMO) Hybrid Automatic Repeat reQuest (HARQ) system based on Space-Time Block Codes (STBCs). We show that there ... -
Feedback-free adaptive modulation selection algorithm for FSO systems
Elamassie, Mohammed; Uysal, Murat (IEEE, 2021-09)Free space optical (FSO) communication systems experience turbulence-induced fading. As a possible solution to mitigate the effects of fading, adaptive transmission that allows the adjustment of transmission parameters ... -
Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors
Elamassie, Mohammed; Sait, S. M.; Uysal, Murat (IEEE, 2021-06)Free space optical (FSO) communication systems are subject to turbulence-induced fading as a result of fluctuations in the refractive index. Gamma-Gamma (GG) distribution is commonly used in the literature to characterize ... -
Finite-SNR diversity-multiplexing tradeoff for network coded cooperative OFDMA systems
Heidarpour, Ali Reza; Karabulut Kurt, G.; Uysal, Murat (IEEE, 2017-03)Network-coded cooperation (NCC) is an effective method to improve the throughput efficiency in cooperative wireless networks. The combined use of orthogonal frequency division multiplexing (OFDM) with NCC has been further ... -
Finite-SNR DMT analysis for multisource multirelay NCC systems with imperfect CSI
Heidarpour, Ali Reza; Karabulut Kurt, G.; Uysal, Murat (IEEE, 2016)Network coded cooperative (NCC) systems have recently attracted attention with their high spectral and power efficiency. In this paper, we investigate the information theoretical limits of NCC systems in the presence of ... -
Flexible generalized spatial modulation for visible light communications
Al-Nahhal, Mohamed; Başar, E.; Uysal, Murat (IEEE, 2021-01)Adaptive spatial modulation (ASM) varies the modulation size across the transmit light-emitting diodes (LEDs) to improve the overall spectral efficiency of visible light communication (VLC) systems. This article proposes ... -
A flexible OLED VLC system for an office environment
Chaleshtori, Z. N.; Zvanovec, S.; Ghassemlooy, Z.; Eldeeb, Hossıen Badr; Uysal, Murat (IEEE, 2020)The potential use of flexible substrate-based organic light emitting diodes (OLEDs) as curved or rolled lighting sources offers news opportunities for the implementation of visible light communications (VLC) in indoor ... -
FPGA based DCO-OFDM PHY transceiver for VLC systems
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 (IEEE, 2019)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 ... -
FPGA-based implementation of an underwater quantum key distribution system with BB84 protocol
Kebapçı, B.; Levent, V. E.; Ergin, S.; Mutlu, Görkem; Bağlıca, İbrahim; Tosun, A.; Paglierani, P.; Pelekanakis, K.; Petroccia, R.; Alves, J.; Uysal, Murat (IEEE, 2023-08)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 ...
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