Browsing by Author "Uysal, Murat"
Now showing items 101-120 of 391
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Effect of wiring and cabling topologies on the performance of distributed MIMO OFDM VLC systems
Narmanlıoğlu, Ömer; Kızılırmak, R. Ç.; Miramirkhani, Farshad; Safaraliev, Sadi; Sait, S. M.; Uysal, Murat (IEEE, 2019)Since most indoor spaces have multiple luminaires for illumination, for visible light communication (VLC) systems, multiple-input multiple-output (MIMO) communication emerges as a natural solution to improve the data rates ... -
Efficient resource allocation scheme for multi-user hybrid VLC/IR networks
Eldeeb, Hossıen Badr; Selmy, H. A. I.; Elsayed, H. M.; Badr, R. I.; Uysal, Murat (IEEE, 2019)An optimal fair resource allocation (OFRA) scheme is proposed to mitigate both inter-symbol and inter-user interferences in uplink multi-user VLC/IR networks. The scheme aims to improve the fairness among the users in terms ... -
Efficient resource allocation scheme in multi-user liFi networks based on angle oriented transceiver
Selmy, H. A. I.; Elsayed, H. M.; Badr, R. I.; Eldeeb, Hossıen Badr; Uysal, Murat (IEEE, 2021)In this paper, an efficient resource allocation scheme in multi-user LiFi networks is proposed using the angle oriented (AO) technology at the receiver and transmitter sides. To cope with the inter-symbol and inter-user ... -
EM-based joint time delay and channel estimation for cooperative communications
Ak, S.; Odabaşıoğlu, N.; Uysal, Murat (IEEE, 2011)In this paper, we study joint time delay and channel estimation for a cooperative communication system with amplify-and-forward (AF) relaying. The proposed joint estimator is based on Expectation-Maximization (EM) algorithm ... -
Emerging optical wireless communications-advances and challenges
Ghassemlooy, Z.; Arnon, S.; Uysal, Murat; Xu, Z.; Cheng, J. (IEEE, 2015-09)New data services and applications are emerging continuously and enhancing the mobile broadband experience. The ability to cope with these varied and sophisticated services and applications will be a key success factor for ... -
End-to-end performance of mixed RF/FSO transmission systems
Samimi, H.; Uysal, Murat (IEEE, 2013-11)In this paper, we consider a heterogenous scenario where free-space optical (FSO) and radio-frequency (RF) technologies are deployed together as a dual-hop communication system, and we investigate the end-to-end outage ... -
Energy aware trajectory optimization of solar powered AUVs for optical underwater sensor networks
Mahmoodi, Khadijeh Ali; Uysal, Murat (IEEE, 2022-12)Visible light communication (VLC) provides an alternative underwater wireless connectivity solution with its low latency and high data rates albeit at relatively shorter distances in the order of tens of meters. In the ... -
Enhanced MRC for decode-and-forward cooperative diversity systems
Nasri, A.; Schober, R.; Uysal, Murat (IEEE, 2012-10)In this letter, we propose a novel enhanced maximal-ratio combining (E-MRC) scheme for multi-branch decode-and-forward (DF) cooperative diversity systems consisting of a source, a destination, and multiple relays. This ... -
Enhanced unipolar OFDM based relay-assisted visible light communications
Gerard, Djengomemgoto (2016-08)Due to spectrum scarcity of the conventional radio frequency (RF) and the higher demand for wireless services, visible light communication (VLC) has emerged as a complementary solution to RF technology for ubiquitous ... -
Error probability of DF relaying with pilot-assisted channel estimation over time-varying fading channels
Ikki, S. S.; Al-Dharrab, S.; Uysal, Murat (IEEE, 2012-01)In this paper, we investigate the error rate performance of a cooperative network with adaptive decode-and-forward (DF) relaying over time-selective frequency-flat Rayleigh-fading channels. We assume pilot-symbol-assisted ... -
Error-rate performance analysis of cooperative OFDMA system with decode-and-forward relaying
Fareed, M. M.; Uysal, Murat; Tsiftsis, T. A. (IEEE, 2014-06)In this paper, we investigate the performance of a cooperative orthogonal frequency-division multiple-access (OFDMA) system with decode-and-forward (DaF) relaying. Specifically, we derive a closed-form approximate ... -
eU-OFDM based multiple access for visible light communication networks
Djengomemgoto, Gerard; Narmanlıoğlu, Ömer; Kizilirmak, R. C.; Uysal, Murat (IEEE, 2017)In this paper, we propose a novel protocol for cooperative multiple access in visible light communication (VLC) networks. The proposed protocol exploits the features of enhanced unipolar orthogonal frequency division ... -
A European view on the next generation optical wireless communication standard
Jungnickel, V.; Uysal, Murat; Serafimovski, N.; Baykas, T.; O’Brien, D.; Ciaramella, E.; Ghassemlooy, Z.; Green, R.; Haas, H.; Haigh, P. A.; Gil Jimenez, V. P.; Miramirkhani, Farshad; Wolf, M.; Zvánovec, S. (IEEE, 2015)Optical wireless technology uses light for mobile communications. The idea is to simultaneously combine the illumination provided by modern high-power light-emitting diodes (LEDs) with high-speed wireless communications. ... -
Event-triggered adaptive handover for centralized hybrid VLCMMW networks
Narmanlıoğlu, Ömer; Uysal, Murat (IEEE, 2022-01)Visible light communication (VLC) builds upon the dual use of LED-based lighting infrastructure for data transmission. It is particularly attractive for user-dense environments and mainly positioned as a complementary ... -
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 ... -
An experimental and numerical investigation of immersion cooled blue led combined with yag:ce phosphor for thermal, electrical and optical performance
At the new age of illumination, light emitting diodes (LEDs) have been proven to be the most efficient alternative to conventional light sources. Yet, in comparison to the other lighting systems, LEDs can withstand a lower ... -
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 ...
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