Browsing by Author "2"
Now showing items 301-320 of 398
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Pedestrian tracking in outdoor spaces of a suburban university campus for the investigation of occupancy patterns
Göçer, Özgür; Göçer, K.; Özcan, Barış; Bakovic, M.; Kıraç, Mustafa Furkan (Elsevier, 2019-02)The design of a livable and comfortable environment has been one of the main aims of sustainable university campus design. The creation of outdoor spaces for accommodating amenities has a positive effect on users with ... -
Performance analysis and optimization of unipolar OFDM based relay-assisted visible light communications☆☆
Narmanlıoğlu, Ömer; Djengomemgoto, G.; Uysal, Murat (Elsevier, 2017)In this paper, we consider a relay-assisted visible light communication (VLC) system where an intermediate light source cooperates with the main light source. Following the IEEE 802.15.7r1 VLC reference channel model, we ... -
Performance analysis of MIMO free-space optical communication systems with selection combining
Kazemi, Hossein; Uysal, Murat (IEEE, 2013)In this paper, we investigate the outage performance of a multi-input multi-output (MIMO) free-space optical (FSO) communication system with selection combining (SC). Under the assumption of log-normal distributed atmospheric ... -
Performance analysis of MIMO NLOS UV communications over atmospheric turbulence channels
Ardakani, Maryam Haghighi; Heidarpour, Ali Reza; Uysal, Murat (IEEE, 2016)Strong molecular and aerosol scattering in ultraviolet (UV) wavelengths enable the non-line-of-sight (NLOS) outdoor wireless connectivity which is attractive in many applications due to covertness and security. In the ... -
Performance analysis of MIMO NLOS UV communications over atmospheric turbulence channels
Ardakani, Maryam Haghighi; Heidarpour, Ali Reza; Uysal, Murat (IEEE, 2016)Strong molecular and aerosol scattering in ultraviolet (UV) wavelengths enable the non-line-of-sight (NLOS) outdoor wireless connectivity which is attractive in many applications due to covertness and security. In the ... -
Performance analysis of quantum key distribution in underwater turbulence channels
Raouf, Amir Hossein Fahim; Safari, M.; Uysal, Murat (The Optical Society, 2020)The current literature on quantum key distribution is limited mainly to transmissions over fiber optic, atmospheric, or satellite links and is not directly applicable to underwater environments with different channel ... -
Performance characterization of vertical underwater VLC links in the presence of turbulence
Elamassie, Mohammed; Uysal, Murat (IEEE, 2018-09-24)In this paper, we investigate the performance of vertical underwater visible light communication (VLC) links. In vertical links, water properties such as temperature and salinity change with the depth. This leads to changes ... -
Performance evaluation of vehicle-to-vehicle visible light communications in the presence of denial of service attacks
Marin-Garcia, I.; Miramirkhani, Farshad; Uysal, Murat; Perez-Jimenez, R. (IEEE, 2019-06)Visible Light Communication (VLC) has been proposed as an efficient vehicle-to-vehicle (VLC) connectivity solution for Intelligent Transportation Systems. By using the preexisting hardware in vehicles (headlights and ... -
Performance of MIMO enhanced unipolar OFDM with realistic indoor visible light channel models
Yesilkaya, A.; Miramirkhani, Farshad; Basar, E.; Panayirci, E.; Uysal, Murat (IEEE, 2016)Visible light communication (VLC) involves the dual use of illumination infrastructure for high speed wireless access. Designing such optical based communication systems, realistic indoor optical channel modeling becomes ... -
Performance of MIMO enhanced unipolar OFDM with realistic indoor visible light channel models
Yesilkaya, A.; Miramirkhani, Farshad; Basar, E.; Panayirci, E.; Uysal, Murat (IEEE, 2016)Visible light communication (VLC) involves the dual use of illumination infrastructure for high speed wireless access. Designing such optical based communication systems, realistic indoor optical channel modeling becomes ... -
Performance of multiuser scheduling in free space optical systems over atmospheric turbulence channels
Zhalehpour, Sasan; Uysal, Murat (IEEE, 2015-10)In this study, the authors consider a multiuser multiple-input multiple-output (MU-MIMO) free space optical (FSO) communication system and investigate the performance of various scheduling protocols which provide different ... -
Performance of OFDM-based adaptive visible light communications
Narmanlıoğlu, Ömer; Kızılırmak, R. C.; Uysal, Murat (IEEE, 2017)In this paper, we investigate the performance of a direct current biased optical orthogonal frequency division multiplexing (DCO-OFDM) based adaptive transmission in the context of visible light communication (VLC). We ... -
Performance of the OZU speaker verification systems with the NIST SRE 2010 data in a multi-class scenario
Yeşil, Fatih; Demiroğlu, Cenk (IEEE, 2012)Konuşmacı doğrulama sistemlerinin başarımı tipik olarak ikili karar mekanizmasına dayanır. Yine de finans şirketlerinin çağrı merkezi gibi 100%’ e yakın kesinlik gerektiren uygulamalarda var olan sistemlerin ikili kararlarına ... -
Physical layer implementation of standard compliant vehicular VLC
Turan, B.; Narmanlioglu, Omer; Coleri Ergen, S.; Uysal, Murat (IEEE, 2017)Visible light communication (VLC) has recently gained popularity as a complementary technology to radio frequency (RF) based alternatives for vehicular communications as a low-cost, secure and RF interference free technology. ... -
Pilot-aided channel estimation on SC-PAM based visible light communications
Narmanlıoğlu, Ömer; Turan, B.; Kizilirmak, R. Ç.; Ergen, S. C.; Uysal, Murat (IEEE, 2018-07-02)Estimation of the time-varying optical wireless channel response is crucial in order to decode received signals coherently. In this work, we investigate symbol-error-rate and mean absolute error performance of different ... -
A platform for personal e-mobility with route forecasting
Kaya, Kamil; Poyrazoğlu, Göktürk (IEEE, 2020)This study reports a new e-mobility platform to construct effective usage of charging points by electric vehicle users to eliminate long charge durations. The e-mobility platform includes such subsystems as smartphones, ... -
Policy conflict resolution in IoT via planning
Göynügür, Emre; Bernardini, S.; Mel, G. de; Talamadupula, K.; Şensoy, Murat (Advances in Artificial Intelligence, 2017)With the explosion of connected devices to automate tasks, manually governing interactions among such devices—and associated services—has become an impossible task. This is because devices have their own obligations and ... -
Portable low cost ultrasound imaging system
Sobhani, Mohammad Rahim; Ozum, H. E.; Yaralıoğlu, Göksen Göksenin; Ergun, A. S.; Bozkurt, A. (IEEE, 2016)The applications of ultrasound in medicine have been increasing in the last decade either in diagnostics or in treatments. Ultrasound is routinely used in clinical examinations, such as pregnancy exams. On the other hand, ... -
Postprocessing synthetic speech with a complex cepstrum vocoder for spoofing phase-based synthetic speech detectors
Demiroğlu, Cenk; Buyuk, O.; Khodabakhsh, Ali; Maia, R. (IEEE, 2017-06)State-of-the-art speaker verification systems are vulnerable to spoofing attacks. To address the issue, high-performance synthetic speech detectors (SSDs) for existing spoofing methods have been proposed. Phase-based SSDs ... -
Predictability of emerging market local currency bond risk premia
Akgiray, V.; Baronyan, S.; Şener, Emrah; Yıldız, Osman (Taylor & Francis, 2015)This article investigates the source of predictability of emerging market (EM) local currency bond risk premia by using a dynamic factor approach based on a large panel of economic and financial time series. We find strong ...
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