Browsing Electrical & Electronics Engineering by Author "Sait, S. M."
Now showing items 1-15 of 15
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Adaptive modulation for FSO IM/DD systems with multiple transmitters and receivers
Nouri, Hatef; Sait, S. M.; Uysal, Murat (IEEE, 2023-02)Atmospheric turbulence is a major impairment in free space optical (FSO) communication systems. Since turbulence induced fading exhibits quasi-static characteristics, reliable feedback of channel state information is ... -
Composite fading model for aerial MIMO FSO links in the presence of atmospheric turbulence and pointing errors
Khallaf, H. S.; Kato, K.; Mohamed, E. M.; Sait, S. M.; Yanikomeroglu, H.; Uysal, Murat (IEEE, 2021-06)In this letter, we introduce accurate approximation expressions for composite fading channel model and outage probability of multiple-input multiple-output (MIMO) free space optical (FSO) link between two unmanned aerial ... -
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 ... -
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 ... -
Effect of wiring and cabling topologies on the performance of distributed MIMO OFDM VLC systems
Narmanlıoğlu, Ömer; Kızılırmak, R. Ç.; Miramirkhani, Farshad; Safaraliev, Sadi; Sait, S. M.; Uysal, Murat (IEEE, 2019)Since most indoor spaces have multiple luminaires for illumination, for visible light communication (VLC) systems, multiple-input multiple-output (MIMO) communication emerges as a natural solution to improve the data rates ... -
Finite-SNR diversity gain analysis of FSO systems over gamma-gamma fading channels with pointing errors
Elamassie, Mohammed; Sait, S. M.; Uysal, Murat (IEEE, 2021-06)Free space optical (FSO) communication systems are subject to turbulence-induced fading as a result of fluctuations in the refractive index. Gamma-Gamma (GG) distribution is commonly used in the literature to characterize ... -
Infrastructure-to-vehicle visible light communications: Channel modelling and performance analysis
Eldeeb, Hossien Badr Hossien; Elamassie, Mohammed; Sait, S. M.; Uysal, Murat (IEEE, 2022-03)Visible light communication (VLC) has emerged as a potential wireless connectivity solution for infrastructure-to-vehicle (I2V) communications. In this paper, we investigate the performance of I2V VLC systems with access ... -
Joint bit and power loading for adaptive MIMO OFDM VLC systems
Siddiqi, U. F.; Narmanlıoğlu, Ömer; Uysal, Murat; Sait, S. M. (Wiley, 2020-07)Visible light communication (VLC) is a short-range wireless access technology based on the dual use of illumination structure. The frequency-selective characteristics of VLC channels motivate the use of orthogonal frequency ... -
Multi-user visible light communications: State-of-the-art and future directions
Al-Ahmadi, S.; Maraqa, O.; Uysal, Murat; Sait, S. M. (IEEE, 2018)Visible light communications (VLC) builds upon the dual use of existing lighting infrastructure for wireless data transmission. VLC has recently gained interest as cost-effective, secure, and energy-efficient wireless ... -
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 ... -
SLIPT for underwater visible light communications: Performance analysis and optimization
Uysal, Murat; Ghasvarianjahromi, Sara; Karbalayghareh, M.; Diamantoulakis, P. D.; Karagiannidis, G. K.; Sait, S. M. (IEEE, 2021-10)In this paper, we investigate simultaneous lightwave information and power transfer (SLIPT) for underwater visible light communication systems. We consider three SLIPT methods namely time switching (TS), power splitting ... -
Underwater visible light communications in cascaded gamma-gamma turbulence
Elamassie, Mohammed; Sait, S. M.; Uysal, Murat (IEEE, 2018)In this paper, we investigate the performance of vertical underwater visible light communication (VLC) links in the presence of moderate and strong turbulence conditions using Gamma-Gamma (GG) probability density function. ... -
Unified resource allocation and mobility management technique using particle swarm optimization for VLC networks
Demir, Muhammet Selim; Sait, S. M.; Uysal, Murat (IEEE, 2018-12)In this paper, we present a unified resource allocation and mobility management algorithm based on particle swarm optimization (PSO) for indoor visible light communication (VLC) networks. We consider a VLC network where ... -
Visible light communication for connected vehicles: How to achieve the omnidirectional coverage?
Eldeeb, Hossıen Badr; Sait, S. M.; Uysal, Murat (IEEE, 2021)Visible light communication (VLC) is based on the idea of modulating the light intensity of LEDs to transmit information and enables the dual use of exterior automotive and road side infrastructure lighting for both ...
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