Characterization of Line-of-Sight Link Availability in Indoor Visible Light Communication Networks Based on the Behavior of Human Users

Rodoplu, Volkan; Hocaoglu, Kemal; Adar, Anil; Cikmazel, Rifat Orhan; Saylam, Alper

doi:10.1109/access.2020.2974704

Cited by 15 publications

(7 citation statements)

References 32 publications

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“…• Line-of-Sight (LoS): VLC generally necessitates a clear LoS between the transmitter and receiver, potentially limiting its applicability in certain situations. This requirement also introduces constraints on mobility and coverage [48,49]. [53].…”

Section: The Basics Of Vlcmentioning

confidence: 99%

A Review of Cognitive Hybrid Radio Frequency/Visible Light Communication Systems for Wireless Sensor Networks

Miranda,

Barriquello,

Reguera

et al. 2023

Sensors

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The development and growth of Wireless Sensor Networks (WSNs) is significantly propelled by advances in Radio Frequency (RF) and Visible Light Communication (VLC) technologies. This paper endeavors to present a comprehensive review of the state-of-the-art in cognitive hybrid RF-VLC systems for WSNs, emphasizing the critical task of seamlessly integrating Cognitive Radio Sensor Networks (CRSNs) and VLC technologies. The central challenge addressed is the intricate landscape of this integration, characterized by notable trade-offs between performance and complexity, which escalate with the addition of more devices and increased data rates. This scenario necessitates the development of advanced cognitive radio strategies, potentially facilitated by Machine Learning (ML) and Deep Learning (DL) approaches, albeit introducing new complexities such as the necessity for pre-training with extensive datasets. The review scrutinizes the fundamental aspects of CRSNs and VLC, spotlighting key areas like Energy Efficient Resource Allocation, Industrial Scenarios, and Energy Harvesting, and explores the synergistic amalgamation of these technologies as a promising pathway for enhanced spectrum utilization and network performance. By delving into the integration of cognitive radio technology with visible light, this study furnishes valuable insights into the potential for innovative applications in wireless communication, presenting a balanced overview of the current advancements and prospective avenues in the field of cognitive hybrid RF/VLC systems.

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Section: The Basics Of Vlcmentioning

confidence: 99%

A Review of Cognitive Hybrid Radio Frequency/Visible Light Communication Systems for Wireless Sensor Networks

Miranda,

Barriquello,

Reguera

et al. 2023

Sensors

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“…In IIoT scenarios, apart from the LoS component, specular multipath components (SMCs) and dense multipath components (DMCs) are modeled as h NLoSSMC qp,fc (t, τ ) and h NLoSDMC qp,fc (t, τ ), respectively. The accuracy of channel models can be significantly improved by considering DMCs, which are caused by smaller scatterers and these scatterers are distributed near SMCs [22] Besides, different from traditional radio frequency (RF) communication systems, the transmitted optical signals in VLC systems have extremely short wavelength [36] and no phase since light-emitting diode (LED) lights emit incoherent light [5]. It follows that the superposition of real-valued multipath signals at the Rx will not lead to SSF, but show slow-changing shadowing.…”

Section: A Cirmentioning

confidence: 99%

Pervasive Wireless Channel Modeling Theory and Applications to 6G GBSMs for All Frequency Bands and All Scenarios

Wang

Gao

et al. 2022

IEEE Trans. Veh. Technol.

107

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In this paper, a pervasive wireless channel modeling theory is first proposed, which uses a unified channel modeling method and a unified equation of channel impulse response (CIR), and can integrate important channel characteristics at different frequency bands and scenarios. Then, we apply the proposed theory to a three dimensional (3D) space-time-frequency (STF) non-stationary geometry-based stochastic model (GBSM) for the sixth generation (6G) wireless communication systems. The proposed 6G pervasive channel model (6GPCM) can characterize statistical properties of channels at all frequency bands from sub-6 GHz to visible light communication (VLC) bands and all scenarios such as unmanned aerial vehicle (UAV), maritime, (ultra-)massive multiple-input multiple-output (MIMO), reconfigurable intelligent surface (RIS), and industry Internet of things (IIoT) scenarios. By adjusting channel model parameters, the 6GPCM can be reduced to various simplified channel models for specific frequency bands and scenarios. Also, it includes standard fifth generation (5G) channel models as special cases. In addition, key statistical properties of the proposed 6GPCM are derived, simulated, and verified by various channel measurement results, which clearly demonstrates its accuracy, pervasiveness, and applicability.

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“…Therefore, only LoS components are considered. In addition, shadowing can occur due to random movements of people and objects, potentially causing data transmission outages [3,21,22]. This work considers the optimization of user grouping based on long-term channel conditions.…”

Section: Transmitted and Received Signalsmentioning

confidence: 99%

Efficient User Grouping for MU-MIMO Visible Light Communications Based on Block Diagonalization

Panta¹,

Saengudomlert²,

Sterckx³

2022

ECTI-EEC

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This paper investigates efficient user grouping methods for multi-user multi-input multi-output (MU-MIMO) visible light communication (VLC) systems. Block diagonalization (BD) precoding is considered for interference avoidance. In addition, time division multiplexing (TDM) is applied to perform user grouping when the number of users exceeds the limit of BD precoding based on the number of light emitting diode (LED) transmitters and the total number of users' photodiodes (PDs). User grouping methods are proposed based on pairwise interference considerations among users in the same group. The proposed methods can be implemented through integer linear programming (ILP), which requires less computation than exhaustive search. The numerical results on the average minimum user throughputs over random scenarios indicate that the proposed hybrid method can significantly outperform random user grouping and performs reasonably well compared to exhaustive search. Finally, this study demonstrates that, when BD precoding greatly attenuates the desired user signals, user grouping can help improve minimum user throughputs even though BD precoding can support all users as a single group.

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Characterization of Line-of-Sight Link Availability in Indoor Visible Light Communication Networks Based on the Behavior of Human Users

Cited by 15 publications

References 32 publications

A Review of Cognitive Hybrid Radio Frequency/Visible Light Communication Systems for Wireless Sensor Networks

A Review of Cognitive Hybrid Radio Frequency/Visible Light Communication Systems for Wireless Sensor Networks

Pervasive Wireless Channel Modeling Theory and Applications to 6G GBSMs for All Frequency Bands and All Scenarios

Efficient User Grouping for MU-MIMO Visible Light Communications Based on Block Diagonalization

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