Browsing Faculty of Engineering by Author "(ORCID 0000-0001-5945-0813 & YÖK ID 124615) Uysal, Murat"
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Kaskat nakagami kanallara sahip röleli sistemler için dağıtılmış uzay-zaman kafes kod tasarımı
İlhan, H.; Altunbaş, İ.; Uysal, Murat (IEEE, 2010)Bu çalışmada, tek roleli, işbirlikli ve kodlamalı bir sistemin kanallarının kaskat Nakagami dağılımlı olması durumundaki hata performans analizi yapılmıştır. Sistemin genel çiftsel hata olasılığı üst sınırı kullanılarak ... -
Kuvvetlendir-ve-aktar tipi işbirlikli haberleşme sistemlerinde zaman senkronizasyonu
Odabaşıoğlu, N.; Ak, S.; Uysal, Murat (IEEE, 2010)The synchronization problem in wireless communication systems becomes more important especially in cooperative communication systems than it is for other diversity systems because all terminals in the cooperation use their ... -
LiFi channel models: office, home, manufacturing cell
Uysal, Murat; Miramirkhani, Farshad; Baykas, T.; Serafimovski, N.; Jungnickel, J. (IEEE, 2015-09)Purpose Providing channel models which allow a fair comparison of different physical layer (PHY) High Rate PD Communications proposals submitted to TG7r1 in response to the Call for Proposals (CFP). ... Notice This document ... -
LiFi reference channel models: office, home, hospital
Uysal, Murat; Miramirkhani, Farshad (IEEE, 2015-07)Purpose To introduce reference channel models for the evaluation of different PHY proposals. Notice This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding ... -
Limited feedback channel estimation for multi-user massive mimo visible light communications
Narmanlıoğlu, Ömer; Uysal, Murat (IEEE, 2020)Building on the existing illumination infrastructure, visible light communication (VLC) utilizes light emitting diode (LED) luminaries as wireless access points. The presence of large number of ceiling lights in conference ... -
Link adaptation for MIMO OFDM visible light communication systems
Narmanlıoğlu, Ömer; Kizilirmak, R. C.; Baykas, T.; Uysal, Murat (IEEE, 2017-11-10)In this paper, we investigate link adaptation for an orthogonal frequency division multiplexing (OFDM)-based multiple-input multiple-output (MIMO) visible light communication (VLC) system. The proposed adaptive OFDM VLC ... -
Link allocation for multiuser systems with hybrid RF/FSO backhaul: Delay-limited and delay-tolerant designs
Jamali, V.; Michalopoulos, D. S.; Uysal, Murat; Schober, R. (IEEE, 2016-05)In this paper, we consider a cascaded radio frequency (RF) and hybrid RF/free space optical (FSO) system where several mobile users transmit their data over an RF link to a decode-and-forward relay node (e.g., a small cell ... -
Low complexity least minimum symbol error rate based post-distortion for vehicular VLC
Mitra, R.; Miramirkhani, F.; Bhatia, V.; Uysal, Murat (IEEE, 2020-10)Vehicular visible light communications (VLC) has emerged as a viable supplement for high speed next-generation vehicle to vehicle (V2V) communication systems. However, performance of a V2V-VLC link is impaired due to ... -
MAC layer performance of multi-hop vehicular VLC networks with CSMA/CA
Eldeeb, Hossıen Badr; Adam, Evşen Yanmaz; Uysal, Murat (IEEE, 2020)Majority of works in the field of vehicular visible light communication (VLC) networks are based on some ideal assumptions. Particularly, the ideal Lambertian pattern is assumed for channel modeling and only a simple ... -
MAC layer performance of the IEEE 802.15.7 visible light communication standard
Shams, Parvaneh; Erol-Kantarci, M.; Uysal, Murat (Wiley, 2016-05)Visible light communications (VLC) is a high-speed wireless communication technology that has recently emerged. VLC uses the illumination infrastructure to meet broadband needs of bandwidth-hungry devices. Its high data ... -
Magnitude and wrap-phase OFDM for MIMO visible light communication systems
Al-Nahhal, Mohamed; Başar, E.; Uysal, Murat (IEEE, 2021-07)Generalized light emitting diode (LED) index modulation (GLIM) has been proposed as an effective multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) scheme for visible light communications ... -
Markov-based performance analysis of medium access in visible light communications
Shams, Parvaneh; Narmanlıoğlu, Ömer; Erol-Kantarcı, M.; Uysal, Murat (IEEE, 2015)Visible light communication (VLC) uses the illumination infrastructure to provide high speed wireless connectivity. VLC has recently emerged as a promising alternative/complementary technology to conventional radio-frequency ... -
Measurement based non-line-of-sight vehicular visible light communication channel characterization
Turan, B.; Narmanlıoğlu, Ömer; Koc, O. N.; Kar, E.; Coleri, S.; Uysal, Murat (IEEE, 2022-09)Vehicular visible light communication (V-VLC) aims to provide secure complementary vehicle-to-everything-communications (V2X) to increase road safety and traffic efficiency. V-VLC provides directional transmissions, mainly ... -
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Mixed RF and hybrid RF/FSO relaying
Jamali, V.; Michalopoulos, D. S.; Uysal, Murat; Schober, R. (IEEE, 2015)In this paper, we consider a mixed RF and hybrid RF/FSO system where several mobile users transmit their data over an RF link to a relay node (e.g. a small cell base station) and the relay forwards the information to a ... -
Mixture-kernel based post-distortion in RKHS for time-varying VLC channels
Mitra, R.; Miramirkhani, Farshad; Bhatia, V.; Uysal, Murat (IEEE, 2019-02)Visible light communication (VLC) based systems are a viable green supplement to existing radio frequency based communication systems. However, it has been found that the performance of VLC based systems is impaired in ... -
A mobile channel model for vlc and application to adaptive system design
Miramirkhani, Farshad; Narmanlıoğlu, Ömer; Uysal, Murat; Panayirci, E. (IEEE, 2017-05)In this letter, we propose a realistic channel model for visible light communication (VLC) assuming a mobile user. Based on non-sequential ray tracing, we first obtain channel impulse responses for each point over the user ... -
Modulating retroreflector based free space optical link for UAV-to-ground communications
Dabiri, M. T.; Rezaee, M.; Mohammadi, L.; Javaherian, F.; Yazdanian, V.; Hasna, M. O.; Uysal, Murat (IEEE, 2022-10)Weight reduction and low power consumption are key requirements in the next generation of unmanned aerial vehicle (UAV) networks. Employing modulating retro-reflector (MRR)-based free space optical (FSO) technology is an ... -
Moment generating function-based performance evaluation of amplify-andforward relaying in N∗Nakagami fading channels
İlhan, H.; Altunbaş, İ.; Uysal, Murat (IEEE, 2011-02-11)In this study, the authors investigate the error rate performance of amplify-and-forward relaying over N∗Nakagami fading channels. This is a recently introduced channel model that involves the product of N Nakagami-m-distributed ... -
Multi-hop coherent free-space optical communications over atmospheric turbulence channels
Aghajanzadeh, S. M.; Uysal, Murat (IEEE, 2011)In this paper, we investigate multi-hop relaying as an efficient fading mitigation tool for coherent free-space optical (FSO) systems over atmospheric turbulence channels. We consider an FSO relaying system with ...
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