Browsing Faculty of Engineering by OzU Authors "Uysal, Murat"
Now showing items 21-40 of 347
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Aperture averaging in multiple-input single-output free-space optical systems using partially coherent radial array beams
Gökçe, M. C.; Baykal, Y.; Uysal, Murat (The Optical Society, 2016-06)Multiple-input single-output (MISO) techniques are employed in free-space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, for the MISO FSO system, a partially coherent radial ... -
Asymptotic performance of generalized transmit laser selection over lognormal turbulence channels
Elamassie, Mohammed; Uysal, Murat (IEEE, 2020-08)In free space optical communication systems, transmit laser selection (TLS) has been proposed as an efficient fading-mitigation technique over turbulence channels. In TLS, the transmitter is equipped with a number of laser ... -
Auction based spectrum trading for cognitive radio networks
Tehrani, M. N.; Uysal, Murat (IEEE, 2013-06)In this letter, we consider the shared used model in cognitive radio networks and design a spectrum trading method to maximize the total satisfaction of the Secondary Users (SUs) and revenue of the Wireless Service Provider ... -
AUV trajectory optimization for an optical underwater sensor network in the presence of ocean currents
Mahmoodi, Khadıjeh Ali; Uysal, Murat (IEEE, 2021)Autonomous underwater vehicles (AUVs) are instrumental for data offloading in underwater sensor networks (USNs). With high data rate capacity at transmission ranges in the order of several tens of meters, visible light ... -
Bit error rate analysis of MISO FSO systems
Gökçe, M. C.; Baykal, Y.; Uysal, Murat (Informa Group Company, 2016-05-09)Multiple-input single-output (MISO) systems are employed in free space optical (FSO) links to mitigate the degrading effects of atmospheric turbulence. In this paper, we consider a MISO FSO system with practical transmitter ... -
Bit-error-rate performance of an underwater wireless optical link under misalignment and turbulence effects
Ijeh, I. C.; Khalighi, M. A.; Elamassie, Mohammed; Hranilovic, S.; Uysal, Murat (IEEE, 2022)Underwater wireless optical communication (UWOC) links are highly susceptible to the degrading effects of oceanic turbulence and beam misalignment. In this paper, considering a silicon photo-multiplier at the receiver, we ... -
Broadcasting brake lights with MIMO-OFDM based vehicular VLC
Turan, B.; Narmanlıoğlu, Ömer; Coleri Ergen, S.; Uysal, Murat (IEEE, 2016)Inter-vehicular connectivity to enhance road safety and enable highly autonomous driving is increasingly becoming popular. Despite the prevalent works on radio-frequency (RF) based vehicular communication schemes, visible ... -
Capacity analysis of free space optical links for a partially coherent gaussian beam over a turbulent channel with pointing errors
Lee, I. E.; Ghassemlooy, Z.; Ng, W. P.; Khalighi, M. A.; Uysal, Murat (IEEE, 2013)In this paper, we investigate the joint effects of beam width and the spatial coherence length in a partially coherent free-space optical (FSO) link from the information theory perspective, taking into account the combined ... -
Capacity analysis of NOMA-enabled underwater VLC networks
Elamassie, Mohammed; Bariah, L.; Uysal, Murat; Muhaidat, S.; Sofotasios, P. C. (IEEE, 2021)Visible light communication (VLC) has recently emerged as an enabling technology for high capacity underwater wireless sensor networks. Non-orthogonal multiple access (NOMA) has been also proven capable of handling a massive ... -
Capacity of hybrid cognitive radio networks with distributed VAAs
Hong, X.; Wang, C.-X.; Uysal, Murat; Ge, X.; Ouyang, S. (IEEE, 2010-09)A cooperative hybrid cognitive radio (CR) network is proposed to simultaneously operate on a dedicated licensed band and a secondary band. The licensed band is used for communications between a base station (BS) and mobile ... -
Centralized light access network (C-LiAN): a novel paradigm for next generation indoor VLC networks
Kizilirmak, R. Ç.; Narmanlıoğlu, Ömer; Uysal, Murat (IEEE, 2017)Visible light communication (VLC) builds upon the idea of using existing lighting infrastructure for wireless data transmission. In a conventional VLC network, each light fixture acts as an access point (AP) which are ... -
Channel estimation for amplify-and forward relaying: cascaded against disintegrated estimators
Amin, O.; Gedik, B.; Uysal, Murat (IEEE, 2010)The authors investigate the performance of amplify-and-forward relaying with two different pilot-symbol-assisted channel estimation methods. In the first estimation method, the cascaded channel consisting of source-to-relay ... -
Channel estimation in underwater cooperative OFDM system with amplify-and-forward relaying
Şenol, H.; Panayırcı, E.; Erdoğan, M.; Uysal, Murat (IEEE, 2012)This paper is concerned with a challenging problem of channel estimation for amplify-and-forward cooperative relay based orthogonal frequency division multiplexing (OFDM) systems in the resence of sparse underwater acoustic ... -
Channel measurements and ray tracing simulations for MIMO light communication at 200 MHz
Eldeeb, Hossıen Badr; Uysal, Murat; Mana, S. M.; Hellwig, P.; Hilt, J.; Jungnickel, V. (IEEE, 2020-09)In this paper, we investigate 2 × 2 MIMO light communication channels using non-sequential ray tracing simulations, and measurements over 200 MHz bandwidth using a MIMO channel sounder. Results indicate good agreement ... -
Channel modeling and characterization for visible light communications
Miramirkhani, Farshad; Uysal, Murat (IEEE, 2015-12)In this paper, we present a comprehensive channel modeling and characterization study for visible light communications. Our study is based on ray tracing, which allows for an accurate description of the interaction of rays ... -
Channel modeling and performance characterization of underwater visible light communications
Elamassie, Mohammed; Miramirkhani, Farshad; Uysal, Murat (IEEE, 2018-07-03)Underwater visible light communication (UVLC) has emerged as an attractive complementary solution to long-range acoustic communication and is able to achieve much higher data speeds. In this paper, we investigate the ... -
Channel modeling for visible light communications
Miramirkhani, Farshad; Uysal, Murat; Panayirci, E. (Springer Science+Business Media, 2016)In this chapter, we present a novel and realistic channel modeling approach for visible light communications that overcomes to the limitations of previous works. In our work, we consider wavelength dependency, effect of ... -
Channel modelling and performance limits of vehicular visible light communication systems
Karbalayghareh, M.; Miramirkhani, F.; Eldeeb, Hossıen Badr; Kızılırmak, R. Ç.; Sait, S.Q.; Uysal, Murat (IEEE, 2020-07)Visible light communication (VLC) has been proposed as an alternative or complementary technology to radio frequency vehicular communications. Front and back vehicle lights can serve as wireless transmitters making VLC a ... -
Channel modelling for indoor visible light communications
Miramirkhani, Farshad; Uysal, Murat (Royal Society Publishing, 2020-04-17)Visible light communication (VLC) allows the dual use of light-emitting diodes (LEDs) for wireless communication purposes in addition to their primary purpose of illumination. As in any other communication system, realistic ... -
Channel modelling for light communications: Validation of ray tracing by measurements
Eldeeb, Hossıen Badr; Uysal, Murat; Mana, S. M.; Hellwig, P.; Hilt, J.; Jungnickel, V. (IEEE, 2020)Light communications, also denoted as LiFi, is promising for future wireless indoor networks. For performance evaluation, the IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models based on ...
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