Relevant bibliographies by topics / Visible light wireless communications

Academic literature on the topic 'Visible light wireless communications'

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Published: 6 September 2023

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Journal articles on the topic "Visible light wireless communications"

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Almadani, Yousef, David Plets, Sander Bastiaens, Wout Joseph, Muhammad Ijaz, Zabih Ghassemlooy, and Sujan Rajbhandari. "Visible Light Communications for Industrial Applications—Challenges and Potentials." Electronics 9, no. 12 (December 16, 2020): 2157. http://dx.doi.org/10.3390/electronics9122157.

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Visible Light Communication (VLC) is a short-range optical wireless communication technology that has been gaining attention due to its potential to offload heavy data traffic from the congested radio wireless spectrum. At the same time, wireless communications are becoming crucial to smart manufacturing within the scope of Industry 4.0. Industry 4.0 is a developing trend of high-speed data exchange in automation for manufacturing technologies and is referred to as the fourth industrial revolution. This trend requires fast, reliable, low-latency, and cost-effective data transmissions with fast synchronizations to ensure smooth operations for various processes. VLC is capable of providing reliable, low-latency, and secure connections that do not penetrate walls and is immune to electromagnetic interference. As such, this paper aims to show the potential of VLC for industrial wireless applications by examining the latest research work in VLC systems. This work also highlights and classifies challenges that might arise with the applicability of VLC and visible light positioning (VLP) systems in these settings. Given the previous work performed in these areas, and the major ongoing experimental projects looking into the use of VLC systems for industrial applications, the use of VLC and VLP systems for industrial applications shows promising potential.
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Manousiadis, Pavlos P., Kou Yoshida, Graham A. Turnbull, and Ifor D. W. Samuel. "Organic semiconductors for visible light communications." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (March 2, 2020): 20190186. http://dx.doi.org/10.1098/rsta.2019.0186.

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Organic semiconductors are an important class of optoelectronic material that are widely studied because of the scope for tuning their properties by tuning their chemical structure, and simple fabrication to make flexible films and devices. Although most effort has focused on developing displays and lighting from these materials, their distinctive properties also make them of interest for visible light communications (VLCs). This article explains how their properties make them suitable for VLC and reviews the main uses that have been explored. On the transmitter side, record white VLC communication has been achieved by using organic semiconductors as colour converters, while direct modulation of organic light-emitting diodes is also possible and could be of interest for display-to-display communication. On the receiver side, organic solar cells can be used to harvest power and data simultaneously, and fluorescent antennas enable fast and sensitive receivers with large field of view. This article is part of the theme issue ‘Optical wireless communication’.
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Lee, Daechun, Kyungmook Choi, Ki-Doo Kim, and Youngil Park. "Visible light wireless communications based on predistorted OFDM." Optics Communications 285, no. 7 (April 2012): 1767–70. http://dx.doi.org/10.1016/j.optcom.2011.12.048.

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Miramirkhani, Farshad, and Murat Uysal. "Channel modelling for indoor visible light communications." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (March 2, 2020): 20190187. http://dx.doi.org/10.1098/rsta.2019.0187.

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Visible light communication (VLC) allows the dual use of light-emitting diodes (LEDs) for wireless communication purposes in addition to their primary purpose of illumination. As in any other communication system, realistic channel modelling is a key for VLC system design, analysis and testing. In this paper, we present a comprehensive survey of indoor VLC channel models. In order to set the background, we start with an overview of infrared (IR) channel modelling, which has received much attention in the past, and highlight the differences between visible and IR optical bands. In the light of these, we present a comparative discussion of existing VLC channel modelling studies and point out the relevant advantages and disadvantages. Then, we provide a detailed description of a site-specific channel modelling approach based on non-sequential ray tracing that precisely captures the optical propagation characteristics of a given indoor environment. We further present channel models for representative deployment scenarios developed through this approach that were adopted by the Institute of Electrical and Electronics Engineering (IEEE) as reference channel models. Finally, we consider mobile VLC scenarios and investigate the effect of receiver location and rotation for a mobile indoor user. This article is part of the theme issue ‘Optical wireless communication’.
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Kinny, Tyran, Franklin Puthuva, Ashore Komban, and Dipti Belekar. "DATA COMMUNICATION USING VISIBLE LIGHT." International Journal of Students' Research in Technology & Management 3, no. 5 (September 27, 2015): 358–62. http://dx.doi.org/10.18510/ijsrtm.2015.354.

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Visible Light Communication (VLC) using a Light Fidelity system, as proposed by a German physicist—Harald Haas, provides transmission of data through illumination by sending data through an LED light source that varies in intensity that can be controlled and adjusted such that it appears as normal light to the naked human eye. Here the property of persistence of vision of the human eye is exploited for additional application of a free, sustainable and green source that can be used for wireless communication at very fast data rates. This paper focuses on developing a low cost Li-Fi based system and analyses its performance with respect to existing wireless technology. Wi-Fi is great for general wireless coverage within buildings, whereas Li-Fi is ideal for high density wireless data coverage in confined area and for relieving radio interference issues. Li-Fi based system provides better bandwidth, efficiency, availability and security than Wi-Fi and has already achieved higher data rates. By leveraging the low-cost nature of LEDs and lighting units there are many opportunities to exploit this medium, from public internet access through day-to-day light sources which have their primary purpose of only emitting light. This project envisions a future where data for communication devices will be transmitted through the visible spectrum thus de-clogging the currently overused RF spectrum.
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Ahmed, Iqrar, Heikki Karvonen, Timo Kumpuniemi, and Marcos Katz. "Wireless Communications for the Hospital of the Future: Requirements, Challenges and Solutions." International Journal of Wireless Information Networks 27, no. 1 (October 28, 2019): 4–17. http://dx.doi.org/10.1007/s10776-019-00468-1.

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Abstract In this conceptual paper, we discuss the concept of hospital of the future (HoF) and the requirements for its wireless connectivity. The HoF will be mostly wireless, connecting patients, healthcare professionals, sensors, computers and medical devices. Spaces of the HoF are first characterized in terms of communicational performance requirements. In order to fulfil the stringent requirements of future healthcare scenarios, such as enhanced performance, security, safety, privacy, and spectrum usage, we propose a flexible hybrid optical-radio wireless network to provide efficient, high-performance wireless connectivity for the HoF. We introduce the concept of connected HoF exploiting reconfigurable hybrid optical-radio networks. Such a network can be dynamically reconfigured to transmit and receive optical, radio or both signals, depending on the requirements of the application. We envisage that HoF will consist of numerous communication devices and hybrid optical-radio access points to transmit data using radio waves and visible light. Light-based communications exploit the idea of visible light communications (VLC), where solid-state luminaries, white light-emitting diodes (LEDs) provide both room illumination as well as optical wireless communications (OWC). The hybrid radio-optical communication system can be used in principle in every scenario of the HoF. In addition to the hybrid access, we also propose a reconfigurable optical-radio communications wireless body area network (WBAN), extending the conventional WBAN to more generic and highly flexible solution. As the radio spectrum is becoming more and more congested, hybrid wireless network approach is an attractive solution to use the spectrum more efficiently. The concept of HoF aims at enhancing healthcare while using hospital resources efficiently. The enormous surge in novel communication technologies such as internet of things (IoT) sensors and wireless medical communications devices could be undermined by spectral congestion, security, safety and privacy issues of radio networks. The considered solution, combining optical and radio transmission network could increase spectral efficiency, enhancing privacy while reducing patient exposure to radio frequency (RF). Parallel radio-optical communications can enhance reliability and security. We also discuss possible operation scenarios and applications that can be introduced in HoF as well as outline potential challenges.
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Yu, Tai-Cheng, Wei-Ta Huang, Wei-Bin Lee, Chi-Wai Chow, Shu-Wei Chang, and Hao-Chung Kuo. "Visible Light Communication System Technology Review: Devices, Architectures, and Applications." Crystals 11, no. 9 (September 9, 2021): 1098. http://dx.doi.org/10.3390/cryst11091098.

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Visible light communication (VLC) is an advanced, highly developed optical wireless communication (OWC) technology that can simultaneously provide lighting and high-speed wireless data transmission. A VLC system has several key advantages: ultra-high data rate, secure communication channels, and a lack of interference from electromagnetic (EM) waves, which enable a wide range of applications. Light-emitting diodes (LEDs) have been considered the optimal choice for VLC systems since they can provide excellent illumination performance. However, the quantum confinement Stark effect (QCSE), crystal orientation, carrier lifetime, and recombination factor will influence the modulation bandwidth, and the transmission performance is severely limited. To solve the insufficient modulation bandwidth, micro-LEDs (μ-LEDs) and laser diodes (LDs) are considered as new ideal light sources. Additionally, the development of modulation technology has dramatically increased the transmission capacity of the system. The performance of the VLC system is briefly discussed in this review article, as well as some of its prospective applications in the realms of the industrial Internet of Things (IoT), vehicle communications, and underwater wireless network applications.
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Chaabawi, N. J. AL, H. Al Furiji, A. Dahir Alramadan, and M. AL Shakban. "Text Transmission Using Visible Light Communication." International Journal of Electrical and Electronics Research 10, no. 3 (September 30, 2022): 627–31. http://dx.doi.org/10.37391/ijeer.100335.

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Recently, WiFi wireless technology was used to send data by using radio signals, this paper will focus on LiFi technology which is an optical wireless networking technology that uses LEDs for the transmission of data using light-emitting diodes. LiFi production models were capable to transmit 150 megabits per second (Mbps). Visible light communication (VLC) is a facile method to overcome the spectrum crisis of radiofrequency. Light Fidelity (Li-Fi) is the wireless data transfer using LED. In this study LEDs have been used to transfer text between two computers using a processing software method, coding the Arduino Mega board by the Arduino software in both sender and receiver is observed. The system has worked better for a white LED than the red LED and IR LED. Experiments have shown that white is the most efficient color for transferring texts from one computer to another.
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Raj, Hritik, Charu Mitra, Gauri Shankar, Chandan Kumar, and Harsh Raj. "Lifi wireless communication." International Journal of Innovative Research in Physics 2, no. 2 (January 1, 2021): 15–18. http://dx.doi.org/10.15864/ijiip.2203.

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Li-Fi stands for Light-fidelity. The technology was very new and proposed by the German Physicist Harald Hass in 2011. Li-Fi basically aims to replace Wi-Fi by using light to transmit internet signals. It works on the principle of visible light communication I.e .use of visible light for communication. Though Li-Fi is a system that is capable of transmitting data at high speeds over the visible light, ultraviolet and infrared spectrum but in its present state only LED lambs can be used. It consists of a light bulb which is used as an emitter and a photo diode as a receiver. Li-Fi provides transmission of data through an LED light bulb that varies in intensity faster than human eye can follow .It is ideal for high density wireless data coverage in confined area where there is no obstacle. It provides better bandwidth efficiency, availability& security than wifi. The technology is actively being developed by several organizations across the globe. In this project we tried to show a basic prototype of wireless data transmission using LiFi and what future it holds within itself for the new generation needs
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Zadobrischi, Eduard. "The Concept regarding Vehicular Communications Based on Visible Light Communication and the IoT." Electronics 12, no. 6 (March 12, 2023): 1359. http://dx.doi.org/10.3390/electronics12061359.

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The most controversial technology—visible light communication—is becoming increasingly promising in the field of wireless networks, being ideal for many indoor and outdoor applications. This article proposes VLC methods and architectures capable of providing high security in vehicles and in their communications with the environment or other cars in traffic. The architectures proposed involve the inclusion of ambient lighting equipment and systems and indoor and outdoor lighting systems, such as headlights, traffic lights, and stoplights. Securing data within vehicular networks and validating them through multiple layers of filtering at the level of the physical PHY layer would drastically strengthen the position of VLC. They are the only source of information through which direct contact is maintained with the other entities in the network. The evaluations and proposals presented here are highly viable and deserve future consideration in light of the results obtained in the practical steps carried out in the research process.
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Dissertations / Theses on the topic "Visible light wireless communications"

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Singh, Ravinder. "Physical layer techniques for indoor wireless visible light communications." Thesis, University of Sheffield, 2015. http://etheses.whiterose.ac.uk/13818/.

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The growing demand for bandwidth-hungry applications and increasing number of smart interconnected devices has increased the data traffic on radio access networks. Subsequently, the saturating spectral efficiencies in crowded radio frequency spectrum has impelled the researchers to exploit the optical spectrum for communications. In particular, many developments in the visible light communication (VLC) as a combined lighting and communications system have taken place. Despite abundant optical bandwidth, the data transmission rates and power efficiencies in VLC are partly limited by the electrical channel bandwidth and the type of signalling sets which can be used in this intensity modulated, direct detected system. In order to improve the power and spectral efficiencies, this thesis focuses on physical layer (PHY) techniques. The state-of-the-art single channel modulations (SCM) based on M-PAM, multi-channel modulations (MCM) based on OFDM, and IEEE standardised multi-colour modulations are investigated comprehensively through simulations and theoretical analysis, over representative VLC channels considering the optical properties of front-end devices. The bit error performances and spectral efficiencies of DC-biased and non DC-biased MCM systems are compared. A new vector coding based MCM is proposed to optimally utilise the channel state information at the transmitter as an alternative to optical OFDM. The throughputs, peak-to-average power ratios and DC-bias requirements of SCM and MCM systems are investigated which show that the lower DC-bias requirements reduce power consumed for the same throughput in SCM systems when compared to MCM systems. A new quad-chromatic colour shift keying (CSK) system is proposed which reduces power requirements and complexity, enhances throughput and realises a four-dimensional signalling to outperform the IEEE standardised tri-chromatic CSK system. For improved power efficiency and throughput of VLC PHY, use of rate-adaptive binary convolutional coding and Viterbi decoding is proposed along with frequency domain channel equalisation to mitigate temporal dispersion over representative VLC channels.
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Camacho, Pedro Alexandre Armas. "Front-end design for visible light communications systems." Master's thesis, Universidade de Aveiro, 2017. http://hdl.handle.net/10773/23477.

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Mestrado em Engenharia Eletrónica e Telecomunicações
Communications are vital in the world today. Everything is connected and this means that communication technologies are constantly being pushed to their limits. Any kind of development and improvement that can be done to increase networks capabilities, will find use in some specific application, or even in more common technologies if such is justified. One such case is VLC, it can be used to improve other communication methods capabilities, or as standalone solution, providing advantage in certain scenarios where regular wirelesscommunicationsmethodswouldnotperformaswell,orwouldnotsuit theapplication. VLCalsooffersthegreatadvantageofutilisinganewmedium of transmission for telecomunication systems, which is the visible light spectrum, and is not yet overused and overregulated as other typical mediums. This work was done in partnership with the integrated circuit systems groupd ofInstitutodeTelecomunicaçõesAveiroandaimstostudyanddevelopoptical front end systems for VLC to be used in future projects by this group.
As Telecomunicações são fundamentais nos nossos dias em que tudo está interligado, levando as tecnologias de telecomunicações constantemente ao seu limite. Todo o tipo de melhoria que possa ser feito para melhorar o desempenho de uma rede, encontrará aplicação em alguma área, mais específica, ou caso se justifique, até mesmo em tecnologias de telecomunicação mais comuns. Um exemplo é o VLC (Visible Light Communication), que pode ser utilizado para melhorar as capacidades de outros tipos de redes de telecomunicações, ou em alternativa a outros tipos de redes, oferecendo vantagens em certos cenários onde métodos tradicionais de telecomunicações sem fios não teriam tão bom desempenho, ou não serviriam a aplicação desejada. O VLC também tem como grande vantagem a hipótese de utilização de um novo meio de transmissão para sistemas de telecomunicações, que é o espectro da luz vísivel, que não se encontra ainda sobrelotado e tem regulamentos mais relaxados que outros meios de comunicação tradicionais. Este trabalho foi feito em colaboração com o grupo de sistemas e circuitos integrados do Instituto de Telecomunicações Aveiro, e visa o estudo de desenvolvimento de ‘frontends’óticosparaVLC,parautilizaçãofuturaemprojetosporpartedeste grupo.
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Tsonev, Dobroslav Antonov. "High speed energy efficient incoherent optical wireless communications." Thesis, University of Edinburgh, 2015. http://hdl.handle.net/1842/10571.

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The growing demand for wireless communication capacity and the overutilisation of the conventional radio frequency (RF) spectrum have inspired research into using alternative spectrum regions for communication. Using optical wireless communications (OWC), for example, offers significant advantages over RF communication in terms of higher bandwidth, lower implementation costs and energy savings. In OWC systems, the information signal has to be real and non-negative. Therefore, modifications to the conventional communication algorithms are required. Multicarrier modulation schemes like orthogonal frequency division multiplexing (OFDM) promise to deliver a more efficient use of the communication capacity through adaptive bit and energy loading techniques. Three OFDM-based schemes – direct-current-biased OFDM (DCO-OFDM), asymmetrically clipped optical OFDM(ACO-OFDM), and pulse-amplitude modulated discrete multitone (PAM-DMT) – have been introduced in the literature. The current work investigates the recently introduced scheme subcarrier-index modulation OFDM as a potential energy-efficient modulation technique with reduced peak-to-average power ratio (PAPR) suitable for applications in OWC. A theoretical model for the analysis of SIM-OFDMin a linear additive white Gaussian noise (AWGN) channel is provided. A closed-form solution for the PAPR in SIM-OFDM is also proposed. Following the work on SIM-OFDM, a novel inherently unipolar modulation scheme, unipolar orthogonal frequency division multiplexing (U-OFDM), is proposed as an alternative to the existing similar schemes: ACO-OFDMand PAM-DMT. Furthermore, an enhanced U-OFDMsignal generation algorithm is introduced which allows the spectral efficiency gap between the inherently unipolar modulation schemes – U-OFDM, ACO-OFDM, PAM-DMT – and the conventionally used DCO-OFDM to be closed. This results in an OFDM-based modulation approach which is electrically and optically more efficient than any other OFDM-based technique proposed so far for intensity modulation and direct detection (IM/DD) communication systems. Non-linear distortion in the optical front-end elements is one of the major limitations for high-speed communication in OWC. This work presents a generalised approach for analysing nonlinear distortion in OFDM-based modulation schemes. The presented technique leads to a closed-form analytical solution for an arbitrary memoryless distortion of the information signal and has been proven to work for the majority of the known unipolar OFDM-based modulation techniques - DCO-OFDM, ACO-OFDM, PAM-DMT and U-OFDM. The high-speed communication capabilities of novel Gallium Nitride based μm-sized light emitting diodes (μLEDs) are investigated, and a record-setting result of 3.5Gb/s using a single 50-μm device is demonstrated. The capabilities of using such devices at practical transmission distances are also investigated, and a 1 Gb/s link using a single device is demonstrated at a distance of up to 10m. Furthermore, a proof-of-concept experiment is realised where a 50-μm LED is successfully modulated using U-OFDM and enhanced U-OFDM to achieve notable energy savings in comparison to DCO-OFDM.
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Duque, Alexis. "Bidirectional visible light communications for the internet of things." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSEI072/document.

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Dans cette thèse, nous concevons et étudions un système de communication bidirectionnel par lumière visible (VLC) entre une diode électroluminescente (DEL) de couleur, intégrée à un objet connecté, et un smartphone. Le dispositif est ainsi capable d'envoyer et de recevoir des informations à travers sa DEL, tandis que le smartphone utilise sa caméra pour recevoir des données et son flash pour envoyer des informations. Nous mettons en œuvre et évaluons expérimentalement ce système VLC DEL-à-camera conçu spécifiquement pour les DELs de couleur à faible puissance. En nous appuyant sur les résultats d'une vaste étude expérimentale, nous modélisons, pour la première fois dans la littérature, le canal de communication DEL-à-caméra. Nous proposons alors un modèle de processus de Bernoulli modulé par une chaîne de Markov, qui nous permet d'étudier facilement l'efficacité de différentes stratégies de retransmission des messages. Nous exploitons ce modèle afin de concevoir un simulateur pour l'évaluation des performances des communications DEL-à-caméra. Afin d'obtenir un système de communication bidirectionnel, nous étudions ensuite les communications de type flash-vers-DEL entre un smartphone non-modifié et une petite DEL de couleur. Les performances, bien que limitées, sont suffisantes pour établir une voie retour qui permet de mettre en œuvre des mécanismes de fiabilisation. Nous proposons alors un mécanisme de codage linéaire pseudo-aléatoire, spécialement adapté aux conditions et contraintes du système DEL-à-caméra en ligne de visée directe. Notre évaluation expérimentale souligne que ce type d'approche augmente le rendement jusqu'à deux fois par rapport aux stratégies de retransmission classiques. Enfin, la plupart des objets que nous adressons ont des contraintes énergétiques importantes. Par conséquent, nous comparons la consommation d'énergie de notre système avec celle d'un module Bluetooth Low Energy avec une activité similaire. Nos résultats montrent que notre système réduit la consommation d'énergie dans le cadre d'un profil d'utilisation classique
With the exponential growth of the Internet of Things, people now expect every household appliance to be smart and connected. At the same time, smartphones have become ubiquitous in our daily life. Their continuous performance improvement and their compatibility with a broad range of radio protocols as WiFi, Bluetooth Low Energy (BLE) or NFC make them the most convenient way to interact with these smart objects. However, providing wireless connectivity with BLE or NFC means adding an extra chipset and an antenna, increasing the object size and price. Previous works already have demonstrated the possibility of receiving information through visible light using an unmodified smartphone thanks to its camera. Also, LED-to-LED communication for smart devices like toys has been shown previously. However, past efforts in LED to camera communication for IoT device communication have been limited. In this work, we design LightIoT, a bidirectional visible-light communication (VLC) system between a low-cost, low-power colored LED that is part of an IoT device and an off-the-shelf smartphone. The IoT device is thus able to send and receive information through its LED, while the smartphone uses its camera to receive data and its flashlight to send information. We implement and experimentally evaluate a LED-to-camera VLC system, designed specifically for small LEDs. The proposed solution exploits the rolling shutter effect of unmodified smartphone cameras and an original decoding algorithm, achieving a throughput of nearly 2 kb/s. Based on the insight gained from an extensive experimental study, we model, for the first time in the literature, the LED-to-camera communication channel. We propose a Markov-modulated Bernoulli process model, which allows us to easily study the performance of different message retransmission strategies. We further exploit this model to implement a simulator for LED-to-Camera communications performance evaluation. In order to achieve bi-directional communications, we evaluate flashlight-to-LED communications using non-rooted smartphones and small LEDs. With these constraints, our implementation achieves a throughput of 30 bits/second. While limited, this is enough for a feed-back channel coming to support the required redundancy mechanisms. Some of these redundancy mechanisms are based on random linear coding, never tested previously in VLC. Therefore, we design and implement, for the first time in the literature, a pseudo random linear coding scheme especially fitted for line-of-sight LED-to-camera conditions. Experimental evaluation highlights that this type of approach increases the goodput up to twice compared to classical retransmission strategies. Finally, we compare the energy consumption of LightIoT with the one of a BLE module with similar activity. Our results show that using the LED for communication purposes reduces the energy consumption under a normal usage behavior
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Tran, Tuan-Anh. "Multiple-input multiple-output optical wireless communications." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:094fbe23-88c3-49c4-b64b-a1de40674123.

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Visible-light optical wireless communications (OWC) is a potential technology that can help resolve the crowdedness of the radio-frequency bands, whilst conveniently exploiting energy-saving light-emitting diodes (LEDs) as transmitters for both illumination and communications. Since there usually are many LEDs in a lighting unit, OWC has a multi- input multi-output (MIMO) geometry which, thanks to its channel diversity, can offer wireless local networks at data-rates many times higher than possible with single-channel systems. In such systems, MIMO-detection methods to separate the different optical channels play an important role in improving the system performance by helping reduce cross-talk between channels. To measure the performance of a particular geometry for MIMO communications, a simulation study, reported in this thesis, found that, amongst the signal- independent metrics, the condition number may be used as a rough predictor of the performance, whilst the channel Signal-to-Interference-and-Noise Ratio (SINR) is the most appropriate for geometry assessment. Combined with the fact that the overall performance of a MIMO system is mostly dominated by its worst channel, this indicates that the most effective way to improve the system performance is to maximise the worst channel’s SINR. One of the possible solutions to improving the SINRs is to use holograms to steer the transmitter images such that their distributions over the photo-detectors reduce overlaps. As LEDs emit partially-coherent light, the beam steering has to be carried out with partially- coherent illumination. By using two lenses to parallelise and collect partially-coherent light before and after the hologram, respectively, the source and image intensity distributions, and the autocorrelation of the hologram can be related in a succinct mathematical relationship. This leads to the development of three computational algorithms based on the autocorrelation function to obtain a quantised hologram with the desired beam-steering capability. These algorithms have their cost functions and performance comparison done at the hologram plane instead of the image plane, which therefore takes less time than traditional image-based methods. Specifically, one of these algorithms is able to save significant time over both the other autocorrelation-based algorithms and the direct binary-search, by 33% and by 50% respectively. A simulation-based study and a corresponding experiment, both reported in this thesis, found that the one of the proposed algorithms had poor power efficiency, whilst the other two were both highly effective in generating digital holograms with precise and power-efficient beam-steering performance. Of these two algorithms, one had superior time performance and was likely the best of the three proposed autocorrelation-based algorithms for generating beam-steering holograms. MIMO-OWC simulation also demonstrated the capability of using beam-steering holograms to design the channel and improve the system performance. Combining reported findings, a strategy can be devised to optimise the throughput of an imaging MIMO-OWC system for a given transmitted power.
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Li, Yichen. "Enhancing communication link performance in visible light communication." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25666.

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With data throughput increasing exponentially in wireless communication networks, the limited radio frequency (RF) spectrum is unable to meet the future data rate demand. As a promising complementary approach, optical wireless communication (OWC) has gained significant attention since its licence-free light spectrum provides a considerable amount of communication bandwidth. In conventional OWC systems, the information-carried signal has to be real-valued and non-negative due to the incoherent light output of the conventional optical transmitter, light emitting diode (LED). Therefore, an intensity modulation and direct detection (IM/DD) system is used for establishing the OWC link. Some modified orthogonal frequency division multiplexing (OFDM) schemes have been proposed to achieve suitable optical signals. In previous research, three OFDM-based schemes have been presented, including DC-biased optical orthogonal frequency division multiplexing (DCO-OFDM), asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) and unipolar orthogonal frequency division multiplexing (U-OFDM). Basic concepts of SPAD receivers are studied and a novel application in OWC is proposed for a permanent downhole monitoring (PDM) system in the gas and oil industry. In this thesis, a complete model of the SPAD-based OWC system is presented, including some related SPAD metrics, the photon counting process in SPAD and a specific nonlinear distortion caused by passive quenching (PQ) and active quenching (AQ) recharged circuits. Moreover, a practical SPAD-based visible light communication (VLC) system and its theoretical analysis are presented in a long-distance gas pipe with a battery-powered LED and a basic on-off keying (OOK) modulation scheme. In this thesis, two novel optical orthogonal frequency division multiplexing (O-OFDM) technologies are proposed: non-DC-biased orthogonal frequency division multiplexing (NDCOFDM) and OFDM with single-photon avalanche diode (SPAD). The former is designed for optical multiple-input multiple-output (O-MIMO) systems based on the optical spatial modulation (OSM) technique. In NDC-OFDM, signs of modulated O-OFDM symbols and absolute values of the symbols are separately transmitted by different information carrying units. This scheme can eliminate clipping distortion in DCO-OFDM and achieve high power efficiency. Furthermore, as the indices of transmitters carry extra information bits, NDC-OFDM gives a significant improvement in spectral efficiency over ACO-OFDM and U-OFDM. In this thesis, SPAD-based OFDM systems with DCO-OFDM and ACO-OFDM are presented and analysed by considering the nonlinear distortion effect of PQ SPAD and AQ SPAD. A comprehensive digital signal processing of SPAD-based OFDM is shown and theoretical functions of the photon counting distribution in PQ SPAD and AQ SPAD are given. Moreover, based on Bussgang theorem, a conventional method for analysing memoryless distortion, close-formed bit-error rate (BER) expressions of SPAD-based OFDM are derived. Furthermore, SPAD-based OFDM is compared with conventional photo-diode (PD) based OFDM systems, and a gain of 40 dB in power efficiency is observed.
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Chowdhury, H. (Helal). "Data download on the move in visible light communications:design and analysis." Doctoral thesis, Oulun yliopisto, 2016. http://urn.fi/urn:isbn:9789526213620.

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Abstract In visible light communication (VLC), light emitting diodes (LEDs) are used as transmitters; the air is the transmission medium and the photodiodes are used for receivers. This is often referred to as light fidelity (Li-Fi). In this thesis, we provide the methodology to evaluate the performance of VLC hotspot networks in the context of data downloading on the move scenarios by using throughput-distance relationship models. In this context, first we study the different properties of optical transceiver elements, noise sources, characterization and modelling of artificial light interference, different link topologies and then we introduce the throughput-distance relationship model. Secondly, the analytically based throughput-distance relationship has been developed for evaluating the performance of VLC hotspot networks in indoor environment in both day and night conditions. Simulation results reveal that background noise has a significant impact on the performance of VLC hotspots. As expected, in both indoor and outdoor environments the VLC hotspot performs better at night than during day. The performance of VLC hotspot networks is also quantified in terms of received file size at different bit error rate requirements and velocities of the mobile user. Thirdly, we study the performance of hybrid (Radio-Optical) WLAN-VLC hotspot and compare its performance with stand-alone VLC-only or WLAN-only hotspot cases. In this case, we also consider the data download on the move scenarios in an indoor environment for a single-user as well as for multi-user cases. In this hybrid WLAN-VLC hotspot, both the WLAN and the VLC are characterized by their throughput and communication range. Simulations have been performed to evaluate the performance of such network for data downloading on the move scenario by taking into account performance metrics such as filesize, average connectivity and system throughput. Simulation results reveal that the considered hybrid WLAN-VLC performs always better than stand-alone VLC-only or WLAN-only hotspot both for a single and multi-user cases. Finally, this thesis analyses the feasibility and potential benefits of using hybrid radio-optical wireless systems. In this respect, cooperative communication using optical relays are also introduced in order to increase the coverage and energy efficiency of the battery operated device. Potential benefits are identified as service connectivity and energy efficiency of battery operated device in an indoor environment. Simulation results reveal that user connectivity and energy efficiency depend on user density, coverage range ratio between single-hop and multi-hop, relay probabilities and mobility of the user
Tiivistelmä Näkyvään valoon pohjautuvassa tiedonsiirrossa (VLC) valodiodeja (LED) käytetään lähettiminä, ilma on siirtokanava ja valoilmaisimia käytetään vastaanottimina. Tätä kutsutaan usein nimellä light fidelity (Li-Fi). Tässä työssä tarjoamme menetelmiä VLC ”hotspot” verkkojen suorituskyvyn arviointiin tiedonsiirtonopeus-etäisyysmalleilla skenaarioissa, jossa tietoa ladataan liikkeessä. Tässä kontekstissa tutkimme ensin optisen lähettimen komponenttien eri ominaisuuksia, kohinan lähteitä, keinovalon häiriömalleja ja tiedonsiirtolinkkien topologioita, jonka jälkeen esittelemme tiedonsiirtonopeuden ja etäisyyden välisen mallin. Toiseksi kehitetyn analyyttisen tiedonsiirto-etäisyys mallia käytetään arvioitaessa VLC hotspot verkkojen suorituskykyä sisäympäristössä sekä päivä että yö olosuhteissa. Simulointien tulokset osoittavat, että taustakohinalla on suuri vaikutus VLC verkkojen suorituskykyyn. Kuten odotettua, sisä- ja ulkotiloissa VLC hotspot toimii paremmin yöllä kuin päivällä. VLC hotspot verkkojen suorituskyky arvioidaan myös vastaanotetun tiedoston koon, eri bittivirhesuhteen vaatimuksilla ja liikkuvan käyttäjän nopeuden suhteen. Kolmanneksi tutkimme hybridi WLAN-VLC hotspot verkon suorituskykyä ja vertaamme sen suorituskykyä pelkän VLC- tai WLAN hotspot tapauksessa. Käsittelemme myös skenaarioita jossa tiedoston lataus tapahtuu liikkeessä sisätilassa yhden käyttäjän sekä monen käyttäjän tapauksissa. Tässä hybridi WLAN-VLC hotspot, sekä erilliset WLAN- ja VLC verkot ovat määritelty niiden tiedonsiirtonopeuden ja kantaman perusteella. Näiden verkkojen suorituskykyä arvioitaessa on tehty joukko tietokonesimulointeja verkossa tapahtuvasta tietojen lataamisesta liikkeessä ottamalla huomioon suorituskyvyn mittarit kuten tiedoston koko, keskimääräinen yhteyden kesto ja saavutettu läpäisy. Simuloinnin tulokset paljastavat, että hybridi WLAN-VLC toimii aina paremmin kuin pelkkä VLC tai WLAN hotspot sekä yhden että monen käyttäjän tapauksessa. Lopuksi työssä analysoidaan ehdotetun järjestelmän toteutettavuus ja mahdolliset edut käytettäessä hybridejä radio-optisia langattomia järjestelmiä. Tältä osin esitellään myös kooperatiiviseen viestintään perustuvat optiset releet parantamaan verkon kattavuutta ja energiatehokkuutta akkukäyttöisissä laitteissa. Mahdolliset hyödyt tunnistetaan palvelun konnektiivisuudessa ja energiatehokkuudessa akkukäyttöisissä laitteissa sisätiloissa. Simulointien tulokset osoittavat, että käyttäjien konnektiivisuus ja energiatehokkuus riippuvat käyttäjätiheydestä, kantaman ja etäisyyden välisestä suhteesta yhden hypyn ja monen hypyn välillä, releointi todennäköisyydestä ja käyttäjien mobiliteetista
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Azim, Ali Waqar. "Signal Processing Techniques for Optical Wireless Communication Systems." Thesis, Université Grenoble Alpes (ComUE), 2018. http://www.theses.fr/2018GREAT059/document.

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Le spectre radiofréquence (RF) diminue en raison d'une augmentation de la demande d'applications sans fil. Par conséquent, il existe une demande importante de régions de spectre alternatifs pour les communications afin d'incliner le spectre RF conventionnel. Dans ce contexte, les communications optiques sans fil (OWC) sont explorées comme un candidat potentiel pour compléter les communications RF. Le travail actuel se concentre sur les techniques d'atténuation des déficiences et les approches de modulation efficaces en énergie pour OWC. Dans un premier temps, on étudie le rapport de puissance crête à moyenne (PAPR) pour le multiplexage par répartition orthogonale de la fréquence optique (O-OFDM) et on présente deux techniques de réduction de PAPR orientées vers la décision. La complexité de ces méthodes est comparativement plus faible que celle des autres méthodes de réduction PAPR, tandis que leurs performances sont également analogues à celles des autres alternatives. Deuxièmement, une approche d'accès multiple par répartition en fréquence optique-porteuse unique (O-SCFDMA), appelée O-SCFDMA sans symétrie d'Hermitain (HSFO-SCFDMA) est proposée. Ce dernier évite la symétrie hermiatienne normalement attendue pour d'autres O-OFDM et Approches O-SCFDMA. Les résultats de la simulation affirment que HSFO-SCFDMA est plus efficace que toute autre approche O-SCFDMA pour OWC et manifeste le plus faible PAPR parmi les autres alternatives. Troisièmement, la performance du précodage est analysée pour l'O-OFDM (LACO-OFDM) asymétriquement en couches. Deux types de précodage sont utilisés, à savoir le précodage par transformée de Fourier et le précodage par transformée d'Hartley. Il est établi que le LACO-OFDM précodé a transformée Hartley présente le PAPR le plus faible et est moins vulnérable à la distorsion non linéaire introduite par les diodes électroluminescentes (LED), mais le rapport signale sur bruit (SNR) augmente ( électrique et optique à la fois) en raison de la structure en couches qui est plus élevée que le LACO-OFDM conventionnelle
The radio-frequency (RF) spectrum is dwindling due to an increase in the demand of wireless applications. Hence, there is substantial demand of alternative spectrum regions for communications to recline the conventional RF spectrum. In this context, optical wireless communications (OWC) is explored as a likely candidate to supplement the RF communications. The current work focuses on impairment mitigation techniques and energy-efficient modulation approaches for OWC. Firstly, the peak-to-average power ratio (PAPR) for optical-orthogonal frequency division multiplexing (O-OFDM) is studied and two decision-directed PAPR reduction techniques are presented. The complexity of these methods is comparatively lower than other PAPR reduction methods, whilst, their performance is likewise analogous with other alternatives. Secondly, an optical-single-carrier frequency division multiple access (O-SCFDMA) approach, referred to as Hermitain symmetry free O-SCFDMA (HSFO-SCFDMA) is proposed, that averts Hermiatian symmetry which is normally expected for other O-OFDM and O-SCFDMA approaches. The simulation results affirm that HSFO-SCFDMA is more efficient than any other O-SCFDMA approach for OWC and manifests the lowest PAPR among the other alternatives. Thirdly, the performance of precoding is analyzed for layered asymmetrically clipped O-OFDM (LACO-OFDM). Two types of precoding are employed, i.e., Fourier transform precoding and Hartley transform precoding. It is established that Hartley transform precoded LACO-OFDM exhibits the lowest PAPR and is less vulnerable to non-linear distortion introduced by the light emitting diodes (LEDs), howbeit, the signal-to-noise ratio (SNR) increase (both electrical and optical) owing to the layered structure is higher than conventional LACO-OFDM
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Hoang, Thai Bang. "Infrared and visible wireless optical technology for body sensor connectivity." Thesis, Limoges, 2019. http://www.theses.fr/2019LIMO0027/document.

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Cette thèse est axée sur le domaine de la communication optique sans fil en intérieur pour la surveillance de la santé basée sur des capteurs corporels. L’état de l'art des communications optique sans fil dans les domaines infrarouge, visible et UV ainsi que l'analyse des systèmes liés à la santé utilisant cette technologie ont été fournis. Cela a permis de définir les objectifs et l'orientation de cette thèse. Nous avons étudié l'utilisation de la technologie infrarouge pour la transmission de données entre un capteur porté par un patient et des récepteurs situés aux coins d'un panneau d'éclairage central au plafond de l'environnement. Un lien en visible a été utilisé pour la transmission de données du luminaire vers le patient portant un smartphone équipé d'un décodeur. Les principaux défis étaient la robustesse des liens infrarouge et visible en ce qui concerne la mobilité du patient et l'impact du corps de l'utilisateur en raison de l'emplacement du capteur. Les simulations de canaux réalisées grâce à la technique de Ray-Tracing associée à la méthode de Monte-Carlo ont permis de déterminer le gain de canal qui est le paramètre principal représentant la performance. En raison de la mobilité du patient, l'analyse a été réalisée de manière statistique et en tenant compte de différents emplacements du capteur sur le corps, de la cheville à l'épaule. Les paramètres physiques et géométriques optimaux relatifs aux émetteurs et aux récepteurs afin de garantir les meilleures performances ont été déduites. Il a été démontré qu’il est essentiel de modéliser la présence du corps pour les deux liaisons montante et descendante. Les performances globales du système ont mis en évidence le potentiel des transmissions sans fil entièrement optiques pour la surveillance médicale basée sur des capteurs corporels. Cela a été en partie confirmé par des expérimentations menées à partir de prototypes de capteur communicant en infrarouge et de produits commerciaux pour la liaison en visible
This thesis is focused on the field of indoor optical wireless communication for health monitoring based on body sensors. The state of the art of optical wireless in the infrared, visible and UV domains as well as the analysis of health related systems using this technology have been provided. This helped to define the objectives and orientations of this thesis. We have studied the use of infrared technology for data transmission between a sensor worn by a patient and receivers located at the corners of a central lighting panel at the ceiling of the environment. A link in visible was used for the transmission of data from the luminaire to the patient carrying a smartphone equipped with a decoder. The main challenges were the robustness of the infrared and visible links with regard to patient mobility and the impact of the user's body due to the location of the sensor. The channel simulations performed using the Ray-Tracing technique associated with the Monte-Carlo method allowed determining the channel gain, which is the main parameter representing the performance. Due to the patient mobility, the analysis was performed statistically and taking into account different locations of the sensor on the body, from the ankle to the shoulder. The optimal physical and geometrical parameters for transmitters and receivers to ensure the best performance have been deduced. It has been shown that it is essential to model the presence of the body for both uplink and downlink. The overall performance of the system has highlighted the potential of fully optical wireless transmissions for medical surveillance based on body sensors. This has been partly confirmed by experiments carried out from infrared communicating sensor prototypes and commercial products for the visible link
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Yu, Zhenhua. "Optical wireless communications with optical power and dynamic range constraints." Diss., Georgia Institute of Technology, 2014. http://hdl.handle.net/1853/51784.

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Along with the rapidly increasing demand for wireless data while more and more crowded radio frequency (RF) spectrum, optical wireless communications (OWC) become a promising candidate to complement conventional RF communications, especially for indoor short and medium range data transmissions. Orthogonal frequency division multiplexing (OFDM) is considered for OWC due to its ability to boost data rates. However, the average emitted optical power and dynamic range of driving signals of LEDs are two major constraints in OWC. OFDM waveforms exhibits high upper and lower peak-to-average power ratios (PAPRs), which make OFDM signals optical power inefficient and easy to violate the dynamic range of LEDs, resulting clipping and nonlinear distortions. In this dissertation, we analyze and design optical power and dynamic range constrained OWC systems, for which OFDM is our major subject. We first derive distributions of upper PAPR and lower PAPR of OWC-OFDM signals. Then we analyze the clipped OFDM signals in term of error vector magnitude (EVM), signal-to-distortion ratio (SDR), and achievable data rates under both optical power and dynamic range constraints. The next part of this dissertation is the OFDM system design for visible light communications (VLC) considering illumination requirement. We investigate the illumination-to-communication efficiency (ICE) in VLC-OFDM, and design the brightness control and flickering mitigation schemes for VLC-OFDM. In the end, to reduce the complexity of driving circuits of LEDs , we propose using delta-sigma modulators in VLC-OFDM systems to convert continuous magnitude OFDM symbols into two-level LED driver signals without loss of the communication theory advantages of OFDM.
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Books on the topic "Visible light wireless communications"

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Riurean, Simona Mirela, Monica Leba, and Andreea Cristina Ionica. Application of Visible Light Wireless Communication in Underground Mine. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-61408-9.

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Wang, Zhaocheng, Qi Wang, Wei Huang, and Zhengyuan Xu, eds. Visible Light Communications. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119331865.

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Chi, Nan. LED-Based Visible Light Communications. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-56660-2.

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United, States Congress Senate Committee on Commerce Science and Transportation Subcommittee on Communications. The nation's wireline and wireless communications infrastructure in light of September 11th: Hearing before the Subcommittee on Communications of the Committee on Commerce, Science, and Transportation, United States Senate, One Hundred Seventh Congress, second session, March 6, 2002. Washington: U.S. G.P.O., 2005.

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Riurean, Simona Mirela, Monica Leba, and Andreea Cristina Ionica. Application of Visible Light Wireless Communication in Underground Mine. Springer International Publishing AG, 2021.

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Riurean, Simona Mirela, Monica Leba, and Andreea Cristina Ionica. Application of Visible Light Wireless Communication in Underground Mine. Springer International Publishing AG, 2022.

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Ghassemlooy, Zabih, Luis Nero Alves, Stanislav Zvánovec, and Mohammad-Ali Khalighi, eds. Visible Light Communications. CRC Press, 2017. http://dx.doi.org/10.1201/9781315367330.

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Wang, Jin-Yuan, ed. Visible Light Communications. InTech, 2017. http://dx.doi.org/10.5772/66915.

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Haigh, Paul Anthony. Visible Light Communications. Institute of Physics Publishing, 2020.

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Arnon, Shlomi. Visible Light Communication. Cambridge University Press, 2015.

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Book chapters on the topic "Visible light wireless communications"

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Ghassemlooy, Z., W. Popoola, and S. Rajbhandari. "Visible Light Communications." In Optical Wireless Communications, 397–468. Second edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, 2018.: CRC Press, 2019. http://dx.doi.org/10.1201/9781315151724-8.

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Narmanlioglu, Omer, Refik Caglar Kizilirmak, Farshad Miramirkhani, and Murat Uysal. "Cooperative Visible Light Communications." In Optical Wireless Communications, 345–62. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30201-0_15.

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Hoeher, Peter Adam. "Modulation Schemes for Optical Wireless Communications." In Visible Light Communications, 24–33. München: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9783446463035.004.

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Hoeher, Peter Adam. "Modulation Schemes for Optical Wireless Communications." In Visible Light Communications, 65–132. München: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9783446461727.004.

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Tsonev, Dobroslav, Mohamed Sufyan Islim, and Harald Haas. "OFDM-Based Visible Light Communications." In Optical Wireless Communications, 255–98. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30201-0_12.

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Miramirkhani, Farshad, Murat Uysal, and Erdal Panayirci. "Channel Modeling for Visible Light Communications." In Optical Wireless Communications, 107–22. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30201-0_6.

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Erol-Kantarci, Melike, and Murat Uysal. "Multiple Access in Visible Light Communication Networks." In Optical Wireless Communications, 451–61. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30201-0_20.

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Ngene, C. E., Prabhat Thakur, and Ghanshyam Singh. "Power Allocation Techniques for Visible Light." In Enabling Technologies for Next Generation Wireless Communications, 45–78. First edition. | Boca Raton, FL : CRC Press/Taylor & Francis Group, LLC, 2021. | Series: Artificial intelligence (AI). Elementary to advanced practices: CRC Press, 2020. http://dx.doi.org/10.1201/9781003003472-5.

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Kashef, Mohamed, Muhammad Ismail, Mohamed Abdallah, Khalid A. Qaraqe, and Erchin Serpedin. "Visible Light Communications for Energy Efficient Heterogeneous Wireless Networks." In Energy Management in Wireless Cellular and Ad-hoc Networks, 299–317. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-27568-0_13.

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Nagarajan, G., and P. Magesh Kannan. "Visible Light Communication for Advanced Wireless 5G Light-Fidelity Networks." In Advanced Wireless Sensing Techniques for 5G Networks, 285–300. Boca Raton : Taylor & Francis, a CRC title, part of the Taylor & Francis imprint, a member of the Taylor & Francis Group, the academic division of T&F Informa, plc, 2019.: Chapman and Hall/CRC, 2018. http://dx.doi.org/10.1201/9781351021746-17.

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Conference papers on the topic "Visible light wireless communications"

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Niarchou, E., A. C. Boucouvalas, Z. Ghassemlooy, L. N. Alves, and S. Zvanovec. "Visible Light Communications for 6G Wireless Networks." In 2021 Third South American Colloquium on Visible Light Communications (SACVLC). IEEE, 2021. http://dx.doi.org/10.1109/sacvlc53127.2021.9652231.

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RamKumar, V., N. Padmavathi, I. Chandra, R. Renugadevi, Christo Ananth, and Darwin Nesakumar A. "An Intelligent Light Assisted Wireless Vehicle Communications using Visible Light Communication." In 2023 International Conference on Advances in Computing, Communication and Applied Informatics (ACCAI). IEEE, 2023. http://dx.doi.org/10.1109/accai58221.2023.10199320.

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Liao, Chien-Lan, Yung-Fu Chang, Chong-Lung Ho, Meng-Chyi Wu, Yuan-Tai Hsieh, Chien-Yu Li, Mau-Phon Houng, and Cheng-Fu Yang. "Light-emitting diodes for visible light communication." In 2015 International Wireless Communications and Mobile Computing Conference (IWCMC). IEEE, 2015. http://dx.doi.org/10.1109/iwcmc.2015.7289162.

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Wang, Zhaocheng, Tianqi Mao, and Qi Wang. "Optical OFDM for visible light communications." In 2017 13th International Wireless Communications and Mobile Computing Conference (IWCMC). IEEE, 2017. http://dx.doi.org/10.1109/iwcmc.2017.7986454.

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Babatundi, Ojemba, Lijun Qian, and Julian Cheng. "Downlink scheduling in visible light communications." In 2014 Sixth International Conference on Wireless Communications and Signal Processing (WCSP). IEEE, 2014. http://dx.doi.org/10.1109/wcsp.2014.6992032.

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Soderi, Simone. "Enhancing Security in 6G Visible Light Communications." In 2020 2nd 6G Wireless Summit (6G SUMMIT). IEEE, 2020. http://dx.doi.org/10.1109/6gsummit49458.2020.9083740.

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Yesilkaya, Anil, Tezcan Cogalan, Serhat Erkucuk, Yalcin Sadi, Erdal Panayirci, Harald Haas, and H. Vincent Poor. "Physical-Layer Security in Visible Light Communications." In 2020 2nd 6G Wireless Summit (6G SUMMIT). IEEE, 2020. http://dx.doi.org/10.1109/6gsummit49458.2020.9083799.

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Chowdhury, Helal, and Marcos Katz. "Cooperative multihop connectivity performance in visible light communications." In 2013 IFIP Wireless Days (WD). IEEE, 2013. http://dx.doi.org/10.1109/wd.2013.6686444.

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Karbalayghareh, Mehdi, Farshad Miramirkhani, Majid Safari, and Murat Uysal. "Vehicular Visible Light Communications with SPAD Receivers." In 2019 IEEE Wireless Communications and Networking Conference (WCNC). IEEE, 2019. http://dx.doi.org/10.1109/wcnc.2019.8885957.

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Shihe Long, Mohammad-Ali Khalighi, Mike Wolf, Salah Bourennane, and Zabih Ghassemlooy. "Channel characterization for indoor visible light communications." In 2014 3rd International Workshop in Optical Wireless Communications (IWOW). IEEE, 2014. http://dx.doi.org/10.1109/iwow.2014.6950780.

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Reports on the topic "Visible light wireless communications"

1

Kulhandjian, Hovannes. A Visible Light Communications Framework for Intelligent Transportation Systems. Mineta Transportation Institute, August 2020. http://dx.doi.org/10.31979/mti.2020.1911.

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