Browsing Electrical & Electronics Engineering by Author "Uysal, Murat"
Now showing items 281-300 of 351
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Practical implementation and performance study of a hard-switched hybrid FSO/RF link under controlled fog environment
Lee, I. E.; Ghassemlooy, Z.; Ng, W. P.; Gourdel, V.; Khalighi, M. A.; Zvanovec, S.; Uysal, Murat (IEEE, 2014)The availability and performance of terrestrial free-space optical (FSO) communication systems are heavily deterred by the fluctuating conditions of the atmospheric channel, particularly in the presence of visibility-limiting ... -
Pricing for open access femtocell networks using market equilibrium and non-cooperative game
Tehrani, M. N.; Uysal, Murat (IEEE, 2012)In this paper, we address the pricing problem in open-access femtocell networks. We use economic and game theoretic approaches such as market equilibrium and non-cooperative game to propose novel pricing schemes. In our ... -
Rate-adaptive OFDM MIMO VLC system
Narmanlıoğlu, Ömer; Kızılırmak, R. Ç.; Miramirkhani, Farshad; Uysal, Murat (IEEE, 2018-01-19)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 MIMO system under consideration ... -
Ray tracing based channel modeling for visible light communications
Sarbazi, Elham; Uysal, Murat; Abdallah, M.; Qaraqe, K. (IEEE, 2014)Bu bildiride, Zemax 13 yazılımı aracılığı ile görünür ışık haberleşmesi (visible light communication, VLC) kanalları karakterize edilecektir. Yaklaşımımızda, ölçülerini tanımlayacağımız iç mekân ortamı üçboyutlu olarak ... -
Real-time implementation of an underwater quantum key distribution system
Kebapçı, B.; Mutlu, Görkem; Bağlıca, İbrahim; Tosun, A.; Ergin, S.; Levent, V. E.; Uysal, Murat; Paglierani, P.; Pelekanakis, K.; Petroccia, R.; Alves, J. (IEEE, 2022)As threats in the maritime domain diversify, securing data transmission becomes critical for underwater wireless networks designed for the surveillance of critical infrastructure and maritime border protection. This has ... -
Reflector-aided underwater optical channel modeling
Yıldız, Samet; Bağlıca, İbrahim; Kebapçı, Burak; Elamassie, Mohammed; Uysal, Murat (Optica Publishing Group, 2022-10-15)Underwater visible light communication (UVLC) has been proposed as a high-speed alternative to acoustic signaling. While most UVLC systems are configured to work in line-of-sight (LOS) conditions, it is also possible to ... -
Relay selection for cooperative underwater acoustic communication systems
Karakaya, B.; Hasna, M. O.; Uysal, Murat; Duman, T. M.; Ghrayeb, A. (IEEE, 2012)In this paper, we consider a multi-carrier and multi-relay underwater acoustic communication (UWAC) system and investigate the relay selection problem. Our channel model is built on an aggregation of both large-scale path ... -
Relay selection in dual-hop vehicular networks
Seyfi, M.; Muhaidat, S.; Liang, J.; Uysal, Murat (IEEE, 2011-02)In this letter, we investigate cooperative diversity with relay selection over cascaded Rayleigh fading channels. In particular, we analyze the performance of a relay selection scheme for cooperative vehicular networks ... -
Relay-assisted OFDM for NLOS ultraviolet communication
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. The main two degrading ... -
Relay-assisted OFDM for ultraviolet communications: performance analysis and optimization
Ardakani, Maryam Haghighi; Uysal, Murat (IEEE, 2017)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 comparison to ... -
Relay-assisted OFDM transmission for indoor visible light communication
Kizilirmak, R. C.; Uysal, Murat (IEEE, 2014)In this study, we investigate a relay-assisted visible light communication (VEC) system where an intermediate light source cooperates with the main light source. Specifically, we consider two light sources in an office ... -
Relay-assisted OFDM-based visible light communications
Kızılırmak, R. Ç.; Narmanlıoğlu, Ömer; Uysal, Murat (IEEE, 2015-10)In this study, we investigate a relay-assisted visible light communication (VLC) system where an intermediate light source cooperates with the main light source. Specifically, we consider two light sources in an office ... -
Relay-assisted OFDM-based visible light communications over multipath channels
Narmanlıoğlu, Ömer; Kizilirmak, R. C.; Uysal, Murat (IEEE, 2015-07)In this paper, we investigate the performance of relay-assisted visible light communication (VLC) system over multipath channels. We consider an indoor environment where the ceiling light serves as the information source ... -
Renkli̇ Gauss gürültülü seyrek sualtı akusti̇k kanalların kesti̇ri̇mi̇
Erdogan, M.; Şenol, H.; Panayırcı, E.; Uysal, Murat (IEEE, 2012)İşbirlikli sualtı kablosuz iletişim sistemleri konusu son yıllarda büyük önem kazanmıştır. Özellikle sualtı akustik kanalların seyrek (sparse) olma özelliği taşıması ve sisteme giren toplamsal gürültünün renkli Gauss ... -
Resource allocation for downlink OFDMA in underwater visible light communications
Elamassie, Mohammed; Karbalayghareh, Mehdi; Miramirkhani, Farshad; Uysal, Murat; Abdallah, M.; Qaraqe, K. (IEEE, 2019-06)As a wireless connectivity solution with low latency and high capacity, visible light communication (VLC) is particularly attractive for high-speed underwater applications such as image or real-time video transmission. In ... -
Resource allocation for visible light communication systems using simulated annealing based on a problem-specific neighbor function
Siddiqi, U. F.; Sait, S. M.; Demir, Muhammet Selim; Uysal, Murat (IEEE, 2019)In this paper, we consider a visible light communication (VLC) system with direct current-biased orthogonal frequency division multiplexing (DC-OFDM) and investigate resource allocation for a multi-user environment. Based ... -
SC-FDE based MIMO uplink transmission over infrared communication channels
Narmanlıoğlu, Ömer; Turan, B.; Kızılırmak, R. Ç.; Ergen, S. C.; Uysal, Murat (IEEE, 2018-07-02)In this paper, we propose a multiple-input multiple-output (MIMO) uplink transmission scheme for optical wireless communication applications. The transmission is based on optical single-carrier frequency domain equalization ... -
Sensing-throughput tradeoff in cooperative spectrum sensing
Tehrani, M. N.; Uysal, Murat (IEEE, 2012)In the current literature on cognitive radio, it is commonly assumed that fixed time durations are assigned for spectrum sensing and data transmission. It is however possible to improve the performance by finding the best ... -
A simulation study of cooperative underwater acoustic communication
Sökün, Hamza Ümit (2012-08)Cooperative communication promises significant performance gains in terms of link reliability, spectral efficiency, system capacity, and transmission range. Due to its indisputable advantages for high-speed underwater ... -
Simultaneous lightwave information and power transfer in underwater visible light communications
Ghasvarianjahromi, Sara; Karbalayghareh, Mehdi; Diamantoulakis, P. D.; Karagiannidis, G. K.; Uysal, Murat (IEEE, 2019)Visible light communication (VLC) has emerged as a high-capacity connectivity solution for underwater sensor networks. Since water is relatively transparent to blue or green light, visible light lasers or LEDs can be used ...
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