Browsing Electrical & Electronics Engineering by Author "Uysal, Murat"
Now showing items 161-180 of 351
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İşbirlikli haberleşmede birleştirilmiş zaman kayması ve sönümlemeli kanal katsayısı kestirimi
Çelik, Y.; Odabaşıoğlu, N.; Uysal, Murat (IEEE, 2013)In this paper, we investigate joint channel gain and time offset estimation for two different data aided methods in cooperative communication with amplify-and-forward (AF) relaying. First one is the Cascaded Estimation ... -
Joint bit and power loading for adaptive MIMO OFDM VLC systems
Siddiqi, U. F.; Narmanlıoğlu, Ömer; Uysal, Murat; Sait, S. M. (Wiley, 2020-07)Visible light communication (VLC) is a short-range wireless access technology based on the dual use of illumination structure. The frequency-selective characteristics of VLC channels motivate the use of orthogonal frequency ... -
Joint lifetime-outage optimization in relay-enabled IoT networks—A deep reinforcement learning approach
Heidarpour, A. R.; Heidarpour, M. R.; Ardakani, M.; Tellambura, C.; Uysal, Murat (IEEE, 2023-01)Network lifetime maximization in Internet of things (IoT) is of paramount importance to ensure uninterrupted data transmission and reduce the frequency of battery replacement. This letter deals with the joint lifetime-outage ... -
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 ...
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