Browsing by Author "Uysal, Murat"
Now showing items 81-100 of 391
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Device-to-device communication in 5G cellular networks: challenges, solutions, and future directions
Tehrani, M. N.; Uysal, Murat; Yanikomeroglu, H. (IEEE, 2014-05)In a conventional cellular system, devices are not allowed to directly communicate with each other in the licensed cellular bandwidth and all communications take place through the base stations. In this article, we envision ... -
Distance and power based experimental verification of channel model in visible light communication
Kısacık, Rıfat; Efe, B. C.; Pusane, A. E.; Uysal, Murat; Baykas, T.; Dündar, G.; Yalcinkaya, A. D. (IEEE, 2019)In this work, a channel model for line-of-sight (LOS) in visible light communication is elaborated. In the proposed channel model, there is no optical component, such as filter or lens, between the transmitting LED and the ... -
Distributed MIMO for Li-Fi: Channel measurements, ray tracing and throughput analysis
Eldeeb, Hossıen Badr; Mana, S. M.; Jungnickel, V.; Hellwig, P.; Hilt, J.; Uysal, Murat (IEEE, 2021-08-15)LiFi has been considered as a promising candidate for future wireless indoor networks. The IEEE P802.15.13 and P802.11bb standardization groups agreed upon channel models generated using the non-sequential ray tracing ... -
Diversity gain analysis of underwater vertical MIMO VLC links in the presence of turbulence
Yılmaz, Anıl; Elamassie, Mohammed; Uysal, Murat (IEEE, 2019)To satisfy the demands of high data rate underwater applications such as image and real-time video transmission, underwater visible light communication (UVLC) has emerged as an alternative to acoustic signaling. One of the ... -
Diversity techniques for ultraviolet communications
Ardakani, Maryam Haghighi (2016-08)Strong molecular and aerosol scattering in ultraviolet (UV) wavelengths enable mechanisms where transmitter can communicate with the receiver in the absence of line of sight (LOS) link. Recent advances in solid state ... -
Diversity-multiplexing trade-off in coherent free-space optical systems with multiple receivers
Aghajanzadeh, S. M.; Uysal, Murat (IEEE, 2010-12)In this paper, from an information theory point of view, we investigate the performance of a coherent freespace optical (FSO) communication system with multiple receive apertures over atmospheric turbulence channels. Our ... -
Diversity-multiplexing tradeoff for log-normal fading channels
Nouri, Hatef; Uysal, Murat (IEEE, 2016-07)Although there has been a growing interest on the study of diversity-multiplexing tradeoff (DMT), the existing works are mostly restricted to the outcomes reported for Rayleigh, Rician, and Nakagami fading channels. In ... -
Diversity-multiplexing tradeoff for network coded cooperative OFDMA systems
Heidarpour, Ali Reza (2016-08)Cooperative communication (CC) exploits the broadcasting nature of wireless transmission and creates a distributed multiple-input multiple-output (MIMO) system among the wireless nodes which are physically separated from ... -
Diversity-multiplexing tradeoff for network coded cooperative OFDMA systems
Heidarpour, Ali Reza; Kurt, G. K.; Uysal, Murat (IEEE, 2015)Network coded cooperation (NCC) is an effective method to improve the throughput efficiency in cooperative wireless networks. In an effort to have further gains over the initial works, which build upon the assumption of ... -
DMT analysis and optimal scheduling for two-hop parallel relay networks
Khayatian, H.; Parvaresh, F.; Abouei, J.; Saberali, S. M.; Uysal, Murat (Elsevier, 2021-06)Two-hop parallel networks with half-duplex relays over quasi-static Rayleigh fading channels are considered. Assuming relays have only local channel state information, optimal communication schemes for these networks in ... -
DMT analysis of coherent free-space optical systems over atmospheric turbulence channels
Aghajanzadeh, S. M.; Uysal, Murat (IEEE, 2010)In this paper, we investigate the diversity-multiplexing tradeoff (DMT) performance of a coherent free-space optical (FSO) communication system with multiple receive apertures over atmospheric turbulence channels. Our study ... -
DMT analysis of multi-hop coherent FSO communication over atmospheric channels
Aghajanzadeh, S. M.; Uysal, Murat (IEEE, 2011)In this paper, we investigate the diversity-multiplexing tradeoff (DMT) of a multi-hop coherent free-space optical (FSO) system over atmospheric channels. We consider a relay-assisted FSO system with decode-and-forward ... -
Drizzle attenuation model for visible and infrared wavelengths
Elamassie, Mohammed; Uysal, Murat (IEEE, 2022)In an outdoor environment, the transmitted optical signal is affected by the atmospheric particles that may scatter or absorb light such as drizzle, rain, snow, fog, and aerosols. Various earlier studies have attempted to ... -
Editorial
Uysal, Murat; Alves, L. N.; Cheng, J.; Chenji, H.; Safari, M.; Özyeğin University; (ORCID 0000-0001-5945-0813 & YÖK ID 124615) Uysal, Murat; Uysal, Murat; 1 (2018-12)N/A -
Effect of eddy diffusivity ratio on underwater optical scintillation index
Elamassie, Mohammed; Uysal, Murat; Baykal, Y.; Abdallah, M.; Qaraqe, K. (The Optical Society, 2017-10-11)The performance of underwater optical wireless communication systems is severely affected by the turbulence that occurs due to the fluctuations in the index of refraction. Most previous studies assume a simplifying, yet ... -
Effect of fog and rain on the performance of vehicular visible light communications
Elamassie, Mohammed; Karbalayghareh, Mehdi; Miramirkhani, Farshad; Kızılırmak, R. Ç.; Uysal, Murat (IEEE, 2018-07-20)In Intelligent Transportation Systems, visible light communication (VLC) has emerged as a powerful candidate to enable wireless connectivity in vehicle-to-vehicle (V2V) and vehicle-to- infrastructure (V2I) links. While VLC ... -
Effect of LED wiring and cabling topologies on visible light communication channels
Safaraliev, Sadi; Miramirkhani, Farshad; Uysal, Murat (IEEE, 2018-01-19)Visible light communication (VLC) is an emerging short-range wireless access technology. It involves the dual use of illumination infrastructure for communication purposes and builds upon the principle of modulating light ... -
Effect of partial coherence on MISO FSO systems
Gökçe, M. C.; Baykal, Y.; Uysal, Murat (IEEE, 2015)Multiple-input single-output (MISO) techniques are employed in free space optical (FSO) systems to mitigate the degrading effects of atmospheric turbulence and therefore the link reliability is improved. In this paper, we ... -
Effect of scattering phase function on underwater visible light communication channel models
Miramirkhani, F.; Karbalayghareh, M.; Uysal, Murat (Elsevier, 2021-10)Non-sequential ray tracing simulations are commonly employed to model underwater visible light communication (VLC) channels. The accuracy of such simulations highly depends on how well the optical properties of water (i.e., ... -
Effect of sea waves on vertical underwater visible light communication links
Elamassie, Mohammed; Sait, S. M.; Uysal, Murat (IEEE, 2023-04)Underwater visible light communication (VLC) has been proposed to deal with emerging high bandwidth underwater applications. Initial research works on underwater VLC are based on the assumption that both transmitter and ...
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