Browsing Electrical & Electronics Engineering by Author "Uysal, Murat"
Now showing items 181-200 of 351
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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 ... -
Multi-hop quantum key distribution with passive relays over underwater turbulence channels
Raouf, Amir Hossein Fahim; Safari, M.; Uysal, Murat (IEEE, 2020)Absorption, scattering, and turbulence experienced in underwater channels severely limit the range of quantum communications. In this paper, to overcome range limitations, we investigate a multi-hop underwater quantum key ... -
Multi-hop quantum key distribution with passive relays over underwater turbulence channels
Raouf, Amir Hossein Fahim; Safari, M.; Uysal, Murat (The Optical Society, 2020-12-01)Absorption, scattering, and turbulence experienced in underwater channels severely limit the range of quantum communication links. In this paper, as a potential solution to overcome range limitations, we investigate a ... -
Multi-hop relaying over the atmospheric poisson channel
Safari, M.; Rad, M. M.; Uysal, Murat (IEEE, 2011)In this paper, we study the outage behavior of a decode-and-forward multi-hop free-space optical (FSO) system over a Poisson channel degraded by atmospheric turbulence. We assume that perfect channel side information (CSI) ... -
Multi-hop relaying over the atmospheric poisson channel: outage analysis and optimization
Safari, M.; Rad, M. M.; Uysal, Murat (IEEE, 2012-03)In this paper, we study the outage behavior of a decode-and-forward multi-hop free-space optical (FSO) system over a Poisson channel degraded by atmospheric turbulence. We assume that perfect channel side information (CSI) ... -
Multi-resampling doppler compensation in cooperative underwater OFDM systems
Karakaya, B.; Hasna, M. O.; Duman, T. M.; Uysal, Murat; Ghrayeb, A. (IEEE, 2013)We consider a multi-carrier cooperative underwater acoustic communication (UWAC) system and investigate the Doppler scaling problem arising due to the motion of different nodes. Specifically, we assume an orthogonal frequency ... -
Multi-user massive MIMO visible light communications with limited pilot transmission
Narmanlıoğlu, Ömer; Uysal, Murat (IEEE, 2022-06-01)Visible light communication (VLC) building on the existing illumination infrastructure utilizes light emitting diode (LED) luminaries as wireless transmitters. To achieve data rates on the order of gigabits per second in ... -
Multi-user visible light communications: State-of-the-art and future directions
Al-Ahmadi, S.; Maraqa, O.; Uysal, Murat; Sait, S. M. (IEEE, 2018)Visible light communications (VLC) builds upon the dual use of existing lighting infrastructure for wireless data transmission. VLC has recently gained interest as cost-effective, secure, and energy-efficient wireless ... -
Multicarrier HF communications with amplify-and-forward relaying
Heidarpour, M. R.; Uysal, Murat (IEEE, 2011)High-frequency (HF) radio communication has been recognized as the primary means for long-range wireless communications since the advent of radio. With its unique features, HF communication continues to be used for a wide ... -
Multipath-doppler diversity for broadband cooperative vehicular communications
Feteiha, M. F.; Uysal, Murat (IEEE, 2011)Initial works on cooperative vehicular communications build upon the assumption of frequency-flat and quasi-static fading channels. This can be justified only for narrowband systems in very slow traffic flows such as in ... -
Multiple-relay selection in amplify-and-forward cooperative wireless networks with multiple source nodes
Wu, J.; Zhang, Y. D.; Amin, M. G.; Uysal, Murat (Springer Science+Business Media, 2012-08)In this article, we propose multiple-relay selection schemes for multiple source nodes in amplify-and-forward wireless relay networks based on the sum capacity maximization criterion. Both optimal and sub-optimal relay ... -
Network-coded cooperative systems in cognitive radio networks
Heidarpour, A. R.; Ardakani, M.; Tellambura, C.; Uysal, Murat (IEEE, 2022-12)We study the performance of a network-coded cooperative (NCC) system in an underlay cognitive radio network (CRN). The primary network (PN) consists of a single transmitter-receiver pair, and the secondary network (SN) is ... -
Network-coded cooperative systems with generalized user-relay selection
Heidarpour, A. R.; Ardakani, M.; Tellambura, C.; Di Renzo, M.; Uysal, Murat (IEEE, 2020-11)We consider a network-coded cooperative (NCC) system that consists of N >= 2 sources, M >= 1 decodeand-forward (DF) relays, and a single destination. The relays perform network coding (NC) on the received sources' symbols ... -
Neural network based digital pre-distorter design for DCO-OFDM visible light communications
Narmanlıoğlu, Ömer; Turan, B.; Coleri, S.; Uysal, Murat (IEEE, 2022)Direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) is an appealing modulation scheme for reliable, high-speed optical transmissions and foreseen to be used in the upcoming IEEE 802.11bb ... -
A new LED response model and its application to pre-equalization in VLC systems
Kısacık, Rıfat; Yagan, M. Y.; Uysal, Murat; Pusane, A. E.; Yalcinkaya, A. D. (IEEE, 2021-09-01)With the growing interest in visible light communication (VLC), it is desired to transmit data at very high rates despite the LED's bandwidth becoming a bottleneck. The bandwidth of a white LED usually ranges between ... -
Next generation M2M cellular networks: challenges and practical considerations
Ali, A.; Hamouda, W.; Uysal, Murat (IEEE, 2015-09)In this article we present the major challenges of future machine-to-machine (M2M) cellular networks such as spectrum scarcity, and support for a large number of low-power, lowcost devices. As an integral part of the future ... -
Non-line-of-sight ultraviolet communications over atmospheric turbulence channels
Ardakani, Maryam Haghighi; Heidarpour, Ali Reza; Uysal, Murat (IEEE, 2015)Ultraviolet (UV) communication enables non-line-of sight (NLOS) outdoor wireless connectivity and is particularly desirable to relax or eliminate pointing and tracking requirements of infrared links. In the current literature, ... -
Non-orthogonal multiple access (NOMA) for indoor visible light communications
Kizilirmak, R. C.; Rowel, C. R.; Uysal, Murat (IEEE, 2015)Providing multiple access support to visible light communication (VLC) systems requires new networking architecture. Non-orthogonal multiple access (NOMA) is a proposed multiple access technique for future cellular systems. ...
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