Article
Chemistry, Analytical
Zengyi Xu, Jianyang Shi, Wenqing Niu, Guojin Qin, Ruizhe Jin, Zhixue He, Nan Chi
Summary: The technique of post-equalization using neural network to model and offset nonlinear distortion in VLC channels is recognized as essential for the upcoming 6G era. However, trained NN may lack generalization and require considerable computing power to retrain for different channel conditions. By using transfer learning strategy to grow DNN models from a well-trained 'stem model', it significantly improves training efficiency and working range of DNN models in real-world UVLC systems.
Article
Engineering, Electrical & Electronic
Farshad Miramirkhani, Mehdi Karbalayghareh, Murat Uysal
Summary: Non-sequential ray tracing simulations are commonly used for modeling underwater visible light communication (VLC) channels, with the accuracy highly dependent on how well the optical properties of water and scattering phase function (SPF) are modeled. Using the Mie SPF for underwater VLC channel modeling, the study demonstrates the importance of selecting realistic SPF models and shows the potential for achieving larger transmission distances.
PHYSICAL COMMUNICATION
(2021)
Article
Engineering, Civil
Mohammed Elamassie, Sadiq M. M. Sait, Murat Uysal
Summary: This article presents a study on the vertical underwater visible light communication (VLC) link, taking into consideration the fluctuation and oscillation of a buoy transmitter. A statistical model is proposed to incorporate random path loss and fading induced by relative movement changes. Closed-form expressions for bit error ratio and achievable diversity orders are derived, and numerical results are provided to validate the analytical findings.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
M. Janarthanan, Sabitha Gauni
Summary: This study proposes a novel model for UVLC transmission systems and compares the performance of different modulation techniques under water turbulent conditions. The results demonstrate the superiority of NRZ modulation scheme and its ability to achieve reliable high-speed transmission in various water turbulence.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Engineering, Multidisciplinary
Arya Maulana Ibrahimy, Budi Ikhwan Fadilah, Dharu Arseno, Brian Pamukti
Summary: Through research on Underwater Visible Light Technology Communication (UVLC), it was found to have advantages of high propagation distance and high data rate. In the experiment, the combination of LED light source and photodiode performed stably, indicating good communication performance in both indoor and underwater environments.
ENGINEERING LETTERS
(2022)
Article
Telecommunications
Monika Jain, Nikhil Sharma, Akash Gupta, Divyang Rawal, Parul Garg
Summary: In this study, a NOMA assisted underwater visible light communication system with full-duplex cooperative relaying is proposed. The system performance is verified through examining different underwater scenarios and confirming the system's viability.
VEHICULAR COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Yixin Zhang, Da Chen, Guanghua Liu, Tao Jiang
Summary: In this paper, the authors investigate two-hop active relaying schemes for dynamic magnetic induction based underwater wireless sensor networks. They propose unidirectional and tri-directional active relays to consider the angular misalignment in practical underwater MI environments. Statistical properties of the received signal-to-noise ratio (SNR) are rigorously analyzed for the proposed schemes, and closed-form expressions of the probability density functions are derived. Based on the statistical SNRs, the authors develop analytical expressions for the achievable rate and bit-to-error rate for the two-hop relaying schemes. Simulation results confirm the effectiveness of the theoretical analyses and show that the proposed tri-directional active relaying scheme performs the best among all comparative schemes.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Optics
Wenqing Niu, Jifan Cai, Zhiteng Luo, Jianyang Shi, Nan Chi
Summary: In this paper, a soft decision method based on Support Vector Machine (SVM) is proposed for underwater visible light communication (UVLC) system. By concatenating consecutive symbols to form a 4-dimensional (4-D) constellation, the correlation between symbols that previous studies have ignored is taken into account. Experimental results show that using the consecutive-symbol-expanded 4-D constellation with SVM for soft decision can greatly improve the performance.
Article
Engineering, Electrical & Electronic
Wenqing Niu, Hui Chen, Fangchen Hu, Jianyang Shi, Yinaer Ha, Guoqiang Li, Zhixue He, Shaohua Yu, Nan Chi
Summary: This paper investigates the performance of Tomlinson-Harashima precoding (THP) in bandwidth-limited underwater visible light communication (UVLC) system and proposes a neural network-based THP. Experimental results demonstrate the feasibility of the proposed method in achieving high data rates and transmission performance.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Rui Jiang, Caiming Sun, Xinke Tang, Long Zhang, Hongjie Wang, Aidong Zhang
Summary: In this article, an asymmetric clipped optical orthogonal frequency division multiplexing and non-orthogonal multiple access (ACO-OFDM-NOMA) scheme is proposed for the uplink UVLC system to achieve energy saving and support massive device connectivity. A low-complexity iterative algorithm is developed to jointly optimize user-subcarrier pairing and power allocation in order to maximize system utility. Simulation results demonstrate that the proposed algorithm outperforms the greedy algorithm and traditional ACO-OFDMA system in terms of system utility.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Junyu Chen, Ming Jiang
Summary: This study proposes a novel blind receiver architecture, BDNet, based on deep learning, which effectively addresses blind channel estimation, channel equalization, and data detection issues in underwater visible light communication systems.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2021)
Article
Optics
Jifan Cai, Ziwei Li, Nan Chi
Summary: This paper proposes a novel approach to underwater visible light channel estimation using a physical prior inspired network based on ensemble learning. The ensemble estimator outperforms other estimators in terms of mean square error performance and spectrum mismatch. Therefore, the proposed ensemble estimator is a valuable tool for underwater visible light channel estimation.
Article
Computer Science, Information Systems
Mohammad Furqan Ali, Dushantha Nalin K. Jayakody, Yonghui Li
Summary: Underwater visible light communication (UVLC) has emerged as a potential wireless carrier for signal transmission in oceanic environments. It offers high capacity data-rate and bandwidth with minimal delay, but faces challenges in long range deployment due to signal attenuation and turbulent channel conditions. This study provides a comprehensive survey of UVLC implementations and summarizes various techniques and applications related to optical signal propagation.
Article
Optics
Junrong Ding, Xiaolong Xie, Ling Wang, Liying Tan, Jing Ma, Dongpeng Kang
Summary: The performance of a dual-hop mixed FSO/RF system with fixed-gain relaying is studied under direct detection and heterodyne detection techniques. The FSO link is modeled using the Fisher-Snedecor F distribution, while the RF link experiences kappa - mu shadowed fading. Closed-form approximate expressions for various performance metrics are derived using the bivariate Fox's H function, and asymptotic analysis is performed at high signal-to-noise ratio. Numerical results and Monte Carlo simulations validate the derived approximate expressions.
Article
Computer Science, Information Systems
Mohamed Mahmoud, Ayman I. Boghdady, Abd El-Rahman A. El-Fikky, Moustafa H. Aly
Summary: This paper studied the probability distribution function of the channel gain for dynamic UVLC models in different types of water, using goodness-of-fit analysis. Different water channels and dynamic scenarios were used, revealing that UVLC is best represented by Weibull, Gamma or Lognormal distributions.
Article
Engineering, Electrical & Electronic
Omer Narmanlioglu, Murat Uysal
Summary: This paper proposes an event-triggered adaptive handover mechanism for centralized hybrid VLC/millimeter wave (MMW) systems, which can significantly improve system performance while minimizing signaling overhead.
IEEE TRANSACTIONS ON COMMUNICATIONS
(2022)
Article
Engineering, Electrical & Electronic
Hossien B. Eldeeb, Mohammed Elamassie, Sadiq M. Sait, Murat Uysal
Summary: This paper investigates the performance of infrastructure-to-vehicle (I2V) visible light communication (VLC) systems with access points in the form of streetlights. Based on non-sequential ray tracing simulations, a closed-form path loss expression and probability distribution function (PDF) are derived. A closed-form bit error rate (BER) expression is obtained using the derived PDF. The accuracy of the derived BER expression is confirmed through comparison with Monte Carlo simulation results, and the effect of transceiver and infrastructure parameters on the BER performance is demonstrated.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Rifat Ksack, Muhammed Yaser Yagan, Murat Uysal, Ali Emre Pusane, Tuncer Baykas, Gunhan Dundar, Arda Deniz Yalcinkaya
Summary: Visible light communication (VLC) is an emerging technology that faces limitations in data transmission due to the modulation bandwidth of LEDs. This paper presents a power-efficient VLC receiver with a switchable equalizer that supports LEDs with different bandwidths. Experimental results show significant improvement in data rate for different tested LEDs.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Lina Bariah, Mohammed Elamassie, Sami Muhaidat, Paschalis C. Sofotasios, Murat Uysal
Summary: This paper focuses on the promising potential of underwater visible light communication (VLC) systems in enabling high data rate, massive connectivity, and ultra-low latency. It introduces non-orthogonal multiple access (NOMA) to improve the spectral efficiency and connectivity of underwater VLC communications. The paper develops a mathematical framework to evaluate the performance of NOMA-enabled underwater VLC systems in the presence of turbulence, considering factors such as path loss and water type.
IEEE PHOTONICS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Shimaa Naser, Lina Bariah, Sami Muhaidat, Mahmoud Al-Qutayri, Murat Uysal, Paschalis Sofotasios
Summary: This paper investigates the integration of spatial modulation and space-time block codes in visible light communication to improve system reliability and data transmission rate. The author also extends the research results to different numbers of light-emitting diodes and pulse amplitude modulation sizes, and provides an upper bound for the corresponding bit error rate.
IEEE PHOTONICS JOURNAL
(2022)
Article
Computer Science, Information Systems
Hamed Tadayyoni, Maryam Haghighi Ardakani, Ali Reza Heidarpour, Murat Uysal
Summary: UV communication links are attractive for UAV networks due to their strong scattering and ability to establish NLOS outdoor connectivity. This study investigates the performance of the uplink airborne UV in the presence of interference and validates the findings through numerical results.
IEEE WIRELESS COMMUNICATIONS LETTERS
(2022)
Article
Computer Science, Hardware & Architecture
Ikenna Chinazaekpere Ijeh, Mohammad Ali Khalighi, Mohammed Elamassie, Steve Hranilovic, Murat Uysal
Summary: This study investigates the performance analysis of a vertical underwater wireless optical communication (UWOC) link subject to oceanic turbulence and pointing errors, and further explores the appropriate selection of link parameters to optimize performance. An accurate mathematical framework and realistic parameters are considered, and an analytical expression for calculating link outage probability is provided and validated through numerical simulations. The necessity of optimal transmitter/receiver parameter selection to minimize link outage is demonstrated.
JOURNAL OF OPTICAL COMMUNICATIONS AND NETWORKING
(2022)
Article
Telecommunications
Ali Reza Heidarpour, Mohammad Reza Heidarpour, Masoud Ardakani, Chintha Tellambura, Murat Uysal
Summary: This letter addresses the joint lifetime-outage optimization in relay-enabled IoT networks using a multiple relay selection scheme. The proposed DDQN-MRS scheme achieves superior performance compared to benchmark MRS schemes, as shown by our results.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Telecommunications
Hatef Nouri, Sadiq M. Sait, Murat Uysal
Summary: This letter proposes an adaptive algorithm for free space optical communication systems to address the impact of atmospheric turbulence. By reliable feedback of channel state information, adaptive transmission is implemented to adapt to turbulence-induced fading. The algorithm adjusts the modulation size/type according to the channel fading conditions to maximize spectral efficiency under peak and average power constraints, while maintaining a targeted value of outage probability. Extensive Monte Carlo simulations are presented to demonstrate the performance of the proposed adaptive scheme over turbulence channels.
IEEE COMMUNICATIONS LETTERS
(2023)
Article
Engineering, Civil
Mohammed Elamassie, Sadiq M. M. Sait, Murat Uysal
Summary: This article presents a study on the vertical underwater visible light communication (VLC) link, taking into consideration the fluctuation and oscillation of a buoy transmitter. A statistical model is proposed to incorporate random path loss and fading induced by relative movement changes. Closed-form expressions for bit error ratio and achievable diversity orders are derived, and numerical results are provided to validate the analytical findings.
IEEE JOURNAL OF OCEANIC ENGINEERING
(2023)
Article
Engineering, Electrical & Electronic
Bassam Aly, Mohammed Elamassie, Murat Uysal
Summary: This paper investigates the application of visible light communication technology for vehicular connectivity, focusing on communication between heavy vehicles. Experimental measurements are used to propose an accurate path loss model that considers the impact of vertical displacement and oscillation. A bit error rate expression is derived for the VLC-based truck-to-truck communication system, and the effects of various system and channel parameters on performance are investigated. The proper selection of photodetector location is further studied to mitigate the degrading effects of vertical oscillation.
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
(2023)
Article
Computer Science, Information Systems
Ali Reza Heidarpour, Mohammad Reza Heidarpour, Masoud Ardakani, Chintha Tellambura, Murat Uysal
Summary: This article studies the problem of network lifetime optimization in a multiuser mobile-edge computing system and proposes a deep reinforcement learning method. The experimental results demonstrate that this method has a fast convergence rate and a small oscillation amplitude, and can significantly improve the network lifetime compared to other schemes.
IEEE INTERNET OF THINGS JOURNAL
(2023)
