Browsing Electrical & Electronics Engineering by Author "Uysal, Murat"
Now showing items 61-80 of 351
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Coverage of a shopping mall with flexible OLED-based visible light communications
Chaleshtori, Z. N.; Zvanovec, S.; Ghassemlooy, Z.; Eldeeb, Hossıen Badr; Uysal, Murat (The Optical Society, 2020-03-30)Visible light communications (VLC) can utilize light-emitting diodes (LEDs) to provide illumination and a safe and low-cost broadcasting network simultaneously. In the past decade, there has been a growing interest in using ... -
A cross-layer design for dynamic resource management of VLC networks
Demir, Muhammet Selim; Uysal, Murat (IEEE, 2021-03)In this article, we propose a cross-layer resource management mechanism for an indoor multiuser visible light communication (VLC) access network. The physical layer builds upon DC-biased orthogonal frequency division ... -
A custom-design atmospheric channel emulator for the performance evaluation of free space optical communication systems
Kebapci, Burak; Miramirkhani, Farshad; Nouri, Hatef; Uysal, Murat (IEEE, 2017)In this paper, we present our custom design atmospheric channel emulator for free space optical (FSO) system evaluations in a controlled environment. Our emulator is in the form of an atmospheric chamber with dimensions ... -
DCT-OFDM tabanlı görünür ışık haberleşmesi
Narmanlıoglu, Ömer; Uysal, Murat (2016)Visible light communication (VLC) is a short-range wireless transmission technique in which light emitting diodes (LEDs) are used as data transmitters. Because of non-coherent characteristics of LEDs, only intensity can ... -
Deep Q-learning based optimization of VLC systems with dynamic time-division multiplexing
Siddiqi, U. F.; Sait, S. M.; Uysal, Murat (IEEE, 2020)The traditional method to solve nondeterministic-polynomial-time (NP)-hard optimization problems is to apply meta-heuristic algorithms. In contrast, Deep Q Learning (DQL) uses memory of experience and deep neural network ... -
Deep reinforcement based power allocation for the max-min optimization in non-orthogonal multiple access
Siddiqi, U. F.; Sait, S. M.; Uysal, Murat (IEEE, 2020)NOMA is a radio access technique that multiplexes several users over the frequency resource and provides high throughput and fairness among different users. The maximization of the minimum the data-rate, also known as ... -
Delivery phase in cache-based wireless networks with modified LT codes
Raouf, A. H. F.; Abouei, J.; Jaseemuddin, M.; Uysal, Murat (Springer Nature, 2020-10)Caching has emerged as an efficient technique to reduce delivery latency and network congestion. The focus of this paper is on content delivery in the caching-based wireless systems. In view of the fact that in such systems, ... -
Design and analysis of broadband amplify-and-forward cooperative systems: A fractionally-spaced sampling approach
Heidarpour, M. R.; Uysal, Murat; Damen, M. O. (IEEE, 2016-10-01)In this paper, we propose novel fractionally-spaced frequency-domain equalizers for the amplify-and-forward cooperative systems. In the proposed equalization schemes, the sampling rate of the received signal remains at ... -
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-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; 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 ...
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