Relevant bibliographies by topics / LiFi

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'LiFi'

Author: Grafiati
Published: 4 June 2021
Last updated: 18 February 2022

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Journal articles on the topic "LiFi"

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Haas, Harald, Liang Yin, Yunlu Wang, and Cheng Chen. "What is LiFi?" Journal of Lightwave Technology 34, no. 6 (March 15, 2016): 1533–44. http://dx.doi.org/10.1109/jlt.2015.2510021.

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Wu, Xiping, and Dominic C. O'Brien. "Parallel Transmission LiFi." IEEE Transactions on Wireless Communications 19, no. 10 (October 2020): 6268–76. http://dx.doi.org/10.1109/twc.2020.3001983.

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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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Konde, Ms Poonam, and Mr Prashant Shimpi. "Accessing the Internet Through Light Using LiFi." International Journal of Trend in Scientific Research and Development Volume-2, Issue-4 (June 30, 2018): 2383–85. http://dx.doi.org/10.31142/ijtsrd15618.

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B. B., Prof Gite, Pankaj Maydeo, Shubhangi Bade, and Tushar Muluk. "Indoor Navigation using LIFI." IJARCCE 6, no. 1 (January 30, 2017): 412–13. http://dx.doi.org/10.17148/ijarcce.2017.6185.

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B. B., Prof Gite, Pankaj Maydeo, Shubhangi Bade, and Tushar Muluk. "Indoor navigation using LIFI." IJARCCE 6, no. 5 (May 30, 2017): 489–90. http://dx.doi.org/10.17148/ijarcce.2017.6594.

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Belhekar, Nikhil, Vishakha Dhamdhere, and Prof Ravikiran Suryawanshi. "Smart Parking Using Lifi." IJARCCE 7, no. 11 (November 30, 2018): 164–65. http://dx.doi.org/10.17148/ijarcce.2018.71136.

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Wu, Xiping, and Harald Haas. "Handover Skipping for LiFi." IEEE Access 7 (2019): 38369–78. http://dx.doi.org/10.1109/access.2019.2903409.

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张, 龙桥. "Research Progress of LiFi Wireless Communication." Hans Journal of Wireless Communications 10, no. 02 (2020): 13–17. http://dx.doi.org/10.12677/hjwc.2020.102002.

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Zhang, Zhenyu, Anas Chaaban, and Lutz Lampe. "Physical layer security in light-fidelity systems." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 378, no. 2169 (March 2, 2020): 20190193. http://dx.doi.org/10.1098/rsta.2019.0193.

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Light-fidelity (LiFi) is a light-based wireless communication technology which can complement radio-frequency (RF) communication technologies for indoor applications. Although LiFi signals are spatially more contained than RF signals, the broadcasting nature of LiFi also makes it susceptible to eavesdropping. Therefore, it is important to secure the transmitted data against potential eavesdroppers. In this paper, an overview of the recent developments pertaining to LiFi physical layer security (PLS) is provided, and the main differences between LiFi PLS and RF PLS are explained. LiFi achievable secrecy rates and upper bounds are then investigated under practical channel models and transmission schemes. Beamforming and jamming, which received significant research attention recently as a means to achieve PLS in LiFi, are also investigated under indoor illumination constraints. Finally, future research directions of interest in LiFi PLS are identified and discussed. This article is part of the theme issue ‘Optical wireless communication’.
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Dissertations / Theses on the topic "LiFi"

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Chen, Cheng. "Downlink system characterisation in LiFi Attocell networks." Thesis, University of Edinburgh, 2017. http://hdl.handle.net/1842/25420.

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There is a trend to move the frequency band for wireless transmission to ever higher frequencies in the radio frequency (RF) spectrum to fulfil the exponentially increasing demand in wireless communication capacity. Research work has gone into improving the spectral efficiency of wireless communication system to use the scarce and expensive resources in the most efficient way. However, to make wireless communication future-proof, it is essential to explore ways to transmit wirelessly outside the traditional RF spectrum. The visible light (VL) spectrum bandwidth is 1000 times wider than the entire 300 GHz RF spectrum and is, therefore, a viable alternative. Visible light communication (VLC) enables existing lighting infrastructures to provide not only illumination but also wireless communication. In conjunction with the concept of cell densification, a networked VLC system, light fidelity attocell (LAC) network, has been proposed to offer wide coverage and high speed wireless data transmission. In this study, many issues related to the downlink system in LAC networks have been investigated. When analysing the downlink performance of LAC networks, a large number of random channel samples are required for the empirical calculation of some system metrics, such as the signal-to-interference-plus-noise ratio (SINR). However, using state-of-the-art approaches to calculate the non-line-of-sight (NLoS) channel component leads to significant computational complexity and prolonged computation time. An analytical method has been presented in this thesis to efficiently calculate the NLoS channel impulse response (CIR) in VLC systems. The results show that the proposed method offers significant reduction in computation time compared to the state-of-the-art approaches. A comprehensive performance evaluation of the downlink system of LAC networks is carried out in this thesis. Based on the research results in the literature in the field of optical wireless communication (OWC), a system level framework for the downlink system in LAC networks is developed. By using this framework, the downlink performance subject to a large number of parameters is evaluated. Additionally, the effect of varying network size, cell deployment and key system parameters are investigated. The calculation of downlink SINR statistics, cell data rate and outage probability are considered and analysed. The results show that the downlink performance of LAC networks is promising in terms of achievable data rate per unit area compared to other state-of-the-art RF small-cell networks. It is found that co-channel interference (CCI) is a major source of signal impairment in the downlink of LAC network. In order to mitigate the influence of CCI on signal distortion in LAC networks, widely used interference mitigation techniques for RF cellular systems are borrowed and extensively investigated. In this study, fractional frequency reuse (FFR) is adapted to the downlink of LAC networks. The SINR statistics and the spectral efficiency in LAC downlink system with FFR schemes are evaluated. Results show that the FFR technique can greatly improve the performance of cell edge users and as well the overall spectral efficiency. Further performance improvements can be achieved by incorporating angular diversity transmitters (ADTs) with FFR and coordinated multi-point joint transmission (JT) techniques.
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Wang, Yunlu. "Load balancing in hybrid LiFi and RF networks." Thesis, University of Edinburgh, 2018. http://hdl.handle.net/1842/31211.

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The increasing number of mobile devices challenges the current radio frequency (RF) networks. The conventional RF spectrum for wireless communications is saturating, motivating to develop other unexplored frequency bands. Light Fidelity (LiFi) which uses more than 300 THz of the visible light spectrum for high-speed wireless communications, is considered a promising complementary technology to its RF counterpart. LiFi enables daily lighting infrastructures, i.e. light emitting diode (LED) lamps to realise data transmission, and maintains the lighting functionality at the same time. Since LiFi mainly relies on line-of-sight (LoS) transmission, users in indoor environments may experience blockages which significantly affects users' quality of service (QoS). Therefore, hybrid LiFi and RF networks (HLRNs) where LiFi supports high data rate transmission and RF offers reliable connectivity, can provide a potential solution to future indoor wireless communications. In HLRNs, efficient load balancing (LB) schemes are critical in improving the traffic performance and network utilisation. In this thesis, the optimisation-based scheme (OBS) and the evolutionary game theory (EGT) based scheme (EGTBS) are proposed for load balancing in HLRNs. Specifically, in OBS, two algorithms, the joint optimisation algorithm (JOA) and the separate optimisation algorithm (SOA) are proposed. Analysis and simulation results show that JOA can achieve the optimal performance in terms of user data rate while requiring high computational complexity. SOA reduces the computational complexity but achieves low user data rates. EGTBS is able to achieve a better performance/complexity trade-off than OBS and other conventional load balancing schemes. In addition, the effects of handover, blockages, orientation of LiFi receivers, and user data rate requirement on the throughput of HLRNs are investigated. Moreover, the packet latency in HLRNs is also studied in this thesis. The notion of LiFi service ratio is introduced, defined as the proportion of users served by LiFi in HLRNs. The optimal LiFi service ratio to minimise system delay is mathematically derived and a low-complexity packet flow assignment scheme based on this optimum ratio is proposed. Simulation results show that the theoretical optimum of the LiFi service ratio is very close to the practical solution. Also, the proposed packet flow assignment scheme can reduce at most 90% of packet delay compared to the conventional load balancing schemes at reduced computational complexity.
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Theljeoui, Adel. "Système hybride de localisation des personnes âgées dans un habitat intelligent." Thesis, Toulouse 2, 2017. http://www.theses.fr/2017TOU20123.

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Durant la dernière décennie, les personnes âgées vivant seules sont de plus en plus nombreuses. Ainsi, afin de leur assurer une assistance à domicile continue, la notion de "maison intelligente" est apparue. Notre travail consiste à combiner trois technologies (Bluetooth Low Energy, audio et LiFi) afin de proposer un système hybride de localisation d'une personne âgée dans une maison intelligente, qui soit efficace et précis. Le principe d’hybridation de ces trois sous-systèmes repose sur la fusion de leurs résultats respectifs via la proposition de trois nouvelles métriques « DOP-Like » permettant d’évaluer le taux de « précision » et « d’exactitude » du résultat de chaque sous-système. Cette évaluation sert à constituer une pondération des résultats intermédiaires afin de calculer la position finale de la cible à localiser. Grâce à l’introduction de ces indicateurs, l’erreur de localisation de notre système est passée de 0,5m à 0,2m en moyenne
Over the past decade, more and more elderly people are choosing to live alone. Therefore, in order to provide them with continuous home assistance, the notion of "intelligent home" has emerged. Our aim is to combine three technologies (Bluetooth Low Energy, Audio and LiFi) to provide an efficient and accurate hybrid indoor localization system that locates an elderly person inside a smart home. The principle of hybridization of these three subsystems is based on the combination of their respective results by proposing three new DOP-Like metrics to evaluate "precision" and "accuracy" of the result of each subsystem. This evaluation serves to constitute a weighting of the intermediate results in order to calculate the final position of the target to be localized. Thanks to the introduction of these indicators, the localization error of our system decreased from an average of 0.5m to 0.2m
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Seauve, Yoann. "Exploration, conception et mise en œuvre de circuit de pilotage pour micro-écrans à LED GaN." Thesis, Université Grenoble Alpes, 2020. http://www.theses.fr/2020GRALT069.

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Les avancées récentes dans le domaine de la fabrication de LEDs Inorganiques permettent la production de LEDs GaN à l’échelle micrométrique. Ces composant optiques, jusqu’ici produits uniquement dans des dimensions importantes, peuvent être associés à un circuit de pilotage CMOS afin de produire des micro-écrans. Les micro-LEDs produites en GaN offrent une luminance maximum et une vitesse de commutation bien supérieures aux autres technologies LEDs généralement utilisées à l’échelle micrométrique. Cependant, elles présentent aussi des caractéristiques électriques spécifiques, telles qu’une efficacité réduite et une dispersion de fonctionnement accrue pour une utilisation sous un faible courant. Ainsi, les méthodes de pilotage couramment utilisées avec d’autres technologies LED s’avèrent peu adaptées.Cette thèse a pour objectif le développement de circuits de pilotage pixel adaptés aux micro-LEDs GaN, autant par le type de pilotage mis en place que par un encombrement compatible avec la surface des LEDs employées. Une première partie des travaux porte sur les applications d’affichage, avec une matrice de pixels compacte exploitant la forte luminance des LEDs, tout en présentant une grande résolution. L’utilisation d’un pilotage de type PWM, avec un fonctionnement intermittent des LEDs sous un fort courant, est retenu en raison des spécificités électriques de ces dernières. Afin de maintenir des dimensions réduites pour ce circuit pixel malgré la relative complexité du pilotage mis en place, une construction en 3D du circuit est présentée. Un dérivé de la technologie 3D CoolCube développée au CEA Leti est envisagé afin de construire un micro-écran sur trois niveaux superposés. Le circuit de pilotage est réparti entre les deux premiers niveaux, constitués de circuits CMOS implémentés avec des transistors de natures différentes. Tandis que les LEDs GaN constituent le troisième niveau de l’assemblage.La seconde partie des travaux est orientée vers l’exploitation du temps de commutation réduit des LEDs GaN. Cette capacité à générer un signal optique de fréquence élevée s’avère particulièrement intéressante pour la réalisation de systèmes de communication optique. Plusieurs émetteurs de communication optique en champ libre, utilisant une LED GaN pour réaliser des transferts de données avec un débit de plusieurs Gb/s, sont présentés dans la littérature. Ces systèmes mono-LED, bien que rapides, s’avèrent complexes à mettre en œuvre et particulièrement encombrants. Des émetteurs utilisant une multitude de LEDs, émettant chacune une fraction du signal optique utilisé pour la transmission, constituent une implémentation alternative. Bien que les transmissions réalisées avec ce type d’équipement restent pour l’instant plus lentes, les émetteurs matricés s’avèrent beaucoup plus compacts. Le développement d’un circuit pixel binaire, permettant la commutation d’une LED entre les deux seuls états, allumé et éteint, est présenté. Grace à un mécanisme de compensation de la capacité parasite induite par la LED, ce circuit atteint une fréquence de commutation de 333 MHz. Enfin, une réflexion quant à l’organisation d’un ensemble de ces pixels au sein d’un émetteur matricé, amène à un contrôle thermométrique des différents pixels. La répartition des LEDs à allumer en fonction du code d’entrée qui en découle permet en effet d’assurer la monotonicité de la conversion réalisée, et offre une linéarité accrue par rapport à d’autres modes de décodages plus simples d’implémentation
Recent advances in the field on inorganic LEDs, allow for manufacturing of GaN LEDs at micrometer scale. These optical devices, which were initially only manufactured with large dimensions, can be associated to a CMOS driving circuit to form micro-displays. GaN based micro-LEDs offer a maximum brightness and a commutation speed, well above other LEDs technologies used at micrometer scale. However, they also have specific electrical characteristics, such as reduced efficiency and large dispersion of behavior, when used with a reduced current. Consequently, driving methods commonly used with other types of LEDs are not appropriate for the control of such devices.This thesis focusses on the design of pixel driving circuits suitable for micro GaN LEDs, both in terms of implemented driving method and footprint compliance with the size of used LEDs. The first part of this work focusses on display applications, with a compact pixel matrix exploiting LEDs high brightness, while offering a large resolution. A PWM driving scheme, which implies sporadic operation of the LEDs under high current, is chosen to deal with LEDs specificities. In order to insure low silicon footprint despite the relatively high complexity of PWM driving, a 3D manufacturing of the circuit is introduced. A derivative of the CoolCube 3D technology that is developed by CEA Leti, is considered to manufacture a micro-display on three superposed levels. The driving circuit is split between the two first levels, made a CMOS circuit with different types of transistors. An array of GaN LEDs form the third level for the display.The second part of this thesis focusses on exploiting the reduced commutation time of the GaN LEDs. The ability to generate a high frequency optical signal is appropriate for building visible light communication emitters. Several free space optical communication emitters reported in the literature use a single GaN LED to transmit data at several Gb/s. Although, these single LED emitters are very fast, they are cumbersome and complex to build. Other emitters, based on a group of LEDs each emitting a part of the optical signal, forms an alternative solution. Even though data transmission is currently slower using these emitters, matrix based emitters are much more compact. This work introduce the design of a binary pixel, which make the LED switch between its two possible states, ON and OFF. Thanks to a LED introduced parasitic capacitance compensation method, this circuit reaches a 333 MHz operation frequency. Finally, a study of the best pixels organization inside the array led to a thermometer type of pixel control. The resulting association between each input code and the activated pixels insures the conversion monotonicity. It also shows a better linearity than other matrix control schemes with simpler implementations
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Lorrière, Nominoë. "Cellules photovoltaïques pour la récupération d'énergie et la communication de données." Electronic Thesis or Diss., Aix-Marseille, 2019. http://www.theses.fr/2019AIXM0570.

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L’invention des LED bleues de forte intensité en 1993 a permis une révolution générale de l’éclairage pour le grand public aussi bien que pour les commerces. Ces nouveaux dispositifs, proposent un rendement énergétique bien supérieur aux technologies commerciales précédentes, ce qui explique leur déploiement massif depuis la fin des années 2000. Les matériaux semiconducteurs composant les LED sont déjà utilisés dans le domaine de la microélectronique pour effectuer des fonctions logiques à hautes fréquences.La technologie LiFi tend à cumuler ces deux propriétés en ajoutant une fonction de transmission d’information aux points d’éclairages existants. L’information est transmise en modulant l’intensité de la lumière à haute fréquence, bien au delà des capacités distinctives de l’oeil. Cette technologie devrait subir un déploiement avec l’arrivée de l’Internet des Objets (IoT) qui apporte une grande demande de connections sans fil, incompatible avec les réseaux radiofréquences actuels. Le travail présenté ici porte sur la réception de cette modulation lumineuse. Les récepteurs usuellement utilisés sont des photodiodes mais ces dernières imposent des contraintes d’éclairage et de consommation difficilement corrélables avec les impératifs de l’IoT. Ainsi, ces travaux étudient la possibilité de réception de la modulation LiFi par des cellules et modules photovoltaïques, dont les deux principales qualités restent les grandes dimensions du détecteur permettant une omnidirectionnalité de réception et une résistance à l’ombrage ainsi que le caractère passif de la détection
The invention of high-intensity blue LED hit the market and the retail industry in 1993. It even brought a revolution in lighting history. These new devices significantly improved energy efficiency than ever before and led to their massive deployment since the end of the 2000s. Semiconductor materials for LED devices are used in the microelectronics domain to implement high-frequency logic functions.Light fidelity (LiFi) technologies combine illumination and communication capabilities by implanting information transmission function to existing lighting equipment. Information is transmitted by using intensity modulation of optical sources at high frequencies, far beyond the range of visual perception. LiFi is an enabling technology for the Internet of Things (IoT) systems. IoT requires a large number of wireless connections, so it is not compatible with existing radiofrequency networks.This work is based on the reception of light modulation. Photodiodes are the mostly used receivers, however their constraints on lighting and consumption make it difficult to meet the requirements of the IoT. On the ground of this, this research is aimed at studying the possibility of receiving LiFi modulation by photovoltaic cells and modules due to their two main qualities: passive detection and large dimensions (omnidirectional reception and shade resistance)
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Uzeir, Eduart. "Una rassegna delle tecnologie di comunicazione ottica senza fili." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2017. http://amslaurea.unibo.it/13271/.

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La tesi fa una panoramica delle tecnologie di comunicazione ottica, i principi di funzionamento, tecniche e strumenti utilizzati e possibili campi di applicazione. Nello specifico si esamina FSO, una tecnologia che opera nella banda delle frequenze a Infrarossi. VLC che opera nello spettro della luce visibile e UVC che opera con la luce Ultravioletta. Il terzo capitolo anlaizza LiFi, una tecnlogia che rappresenta l'evoluzione di VLC.
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Mohammedi, Merah Mounir. "Conception et réalisation d’un lien Light-Fidelity multi-utilisateur en intérieur." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV061/document.

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De nos jours, le nombre d'appareils connectés nécessitant un accès aux données mobiles est en augmentation constante. L'arrivée d'encore plus d'ojects multimédias connectés et la demande croissante d'informations par appareil ont mis en évidence les limites de la quatrième génération de réseaux cellulaires (4G). Cela a poussé au développement de nouvelles méthodes, dont la 5G. L'objectif est d'être en mesure de prendre en charge la croissance des systèmes portables, des capteurs ou des sysèmes associés à l'internet des objets (IoT). La vision derrière la 5G est de permettre une société entièrement mobile et connectée avec une expérience consistente.Les petites cellules sont la base des normes de communication avancées telles que 4G et maintenant 5G. Ils résultent de l’utilisation de bandes de fréquences plus élevées pour l’accès radiofréquences (RF) afin de supporter de nouvelles normes et exigences croissantes en bande passante. La 5G utilise des ondes millimétriques et nécessite un déploiement dans un environnement urbain intérieur et urbain dense, ce qui peut s'avérer être un défi. C’est là que la 5G devra inclure des solutions de réseau hybrides et pouvoir coexister avec d’autres technologies d’accès sans fil. La communication par lumière visible (VLC) s’inscrit dans ce moule puisque la lumière visible correspond à la bande comprise entre 400 et 800 THz. Le spectre disponible est des milliers de fois plus large que le spectre RF et il n’interfère pas avec celui-ci. Le principe se base sur la combinaison de l'éclairage avec un lien de communication pouvant atteindre des dizaines de gigabits par seconde. Le potentiel est d’offrir un complément à la 5G dans un réseau hybride, offrant une vitesse élevée, aucune interférence et une sécurité accrue au prix d’une couverture limitée et d’une faible maturité technologique.L’objectif de cette thèse est donc de proposer et d’évaluer une implémentation expérimentale d’un système VLC en intérieur et multi-utilisateurs afin de répondre aux objectifs de la configuration light-fidelity (Li-Fi) dans le contexte d’une petite cellule. La première étape de cette étude est un état de l'art détaillé sur le principe de VLC dans la communication sans fil en intérieur et de l’accès multi-utilisateur. Cela permet de mieux expliquer le concept de notre désign et de comparer notre approche aux travaux existants. La deuxième étape consiste en une analyse des principes et des hypothèses pour le système VLC multi-utilisateurs en intérieur portant à la fois sur la technique de modulation et sur les schémas d’accès multi-utilisateurs. Les conclusions tirées des analyses théoriques et numériques servent de base pour la suite du travail. La troisième étape consiste en plusieurs analyses expérimentales sur l'optimisation des performances de diffusion pour un utilisateur unique, puis sur les performances multi-utilisateurs du système à l'aide de divers schémas d'accès. Le débit total avec une LED blanche commerciale atteint 163 Mb/s avec un taux d'erreur réduit d'un facteur de 3,55 grâce au processus d'optimisation des performances. Cette technique a l'avantage d'augmenter la flexibilité pour un scénario avec plusieurs utilisateurs sans augmenter la complexité car seuls les paramètres des filtres de modulation sont altérés. La taille de la cellule obtenue est de 4.56 m² à une distance de 2,15 mètres du transmetteur. Le capacité peut atteindre jusqu'à 40 utilisateurs, ou 40.62 Mb/s dans un scénario à 4 utilisateurs. Il est donc démontré que le système proposé pourrait fonctionner comme une cellule à une distance réaliste, avec un débit de données élevé et la capacité de répondre aux besoins d’un grand nombre d’utilisateurs tout en limitant les coûts de mise en œuvre
Nowadays, the number of connected devices requiring access to mobile data is considerably increasing. The arrival of even more connected multimedia objects and the growing demand for more information per device highlighted the limits of the fourth generation of broadband cellular networks (4G). This pushed for the development of new methods, one of which is 5G. The goal is to be able to support the growth of wearable, sensors, or related internet-of-object (IoT) systems. The vision behind 5G is to enable a fully mobile and connected society with a consistent experience. In consequence, there is a fundamental need to achieve a seamless and consistent user experience across time and space.Small cells are the basis of advanced communications standards such as 4G and now, 5G. They exist as a result of using higher frequency bands for RF access in order to support new standards and the increasing demands in bandwidth. 5G use millimeter waves and requires a deployment across indoor and dense urban environment which may prove to be a challenge. This is where 5G will need to include hybrid networking solutions and be able to coexist with other wireless access technologies. Visible light communication (VLC) fits into that mold since visible light corresponds to the band between 400 and 800 THz. The available spectrum is multiple thousand times the size of the RF spectrum and it does not interfere with it. The technique combines illumination with communication at possibly tens of gigabits per second. It has the potential to offer a synergistic pairing with 5G in a hybrid network, offering high speed, no interferences, and more security at the cost of limited coverage and low technological maturity.The goal of this thesis is thus to propose and evaluate an experimental implementation of an indoor multi-user VLC system in order to answer the objectives of Li-Fi setup in the context of a small cell. The first step of this study is a detailed state-of-the-art on VLC in indoor wireless communication and multi-user access. It allows the design of our work to be better explained and to compare our approach with existing works. The second step is an analysis of the principles and hypothesis supporting the indoor multi-user VLC system in the study both on the modulation technique and the multi-user access schemes. The conclusions drawn from theoretical and numerical analysis are used as a basis for the rest of the work. The third step is the experimental setup investigations on the single-user broadcast performances optimization and then on the multi-user performances of the system using various schemes. The total throughput using an off-the-shelf white LED reaches 163 Mb/s with a bit-error rate decreased by a factor of 3.55 thanks to the performance optimization process. This technique has the advantage of increasing the flexibility for a multi-access scenario while not augmenting the complexity as it only optimizes the modulation filter parameters. The multi-user access is obtained for a cell size of 4.56 m² at a distance of 2.15 meter away from the transmitter. The user capacity can reach up to 40 users, or 40.62 Mb/s in a 4-user scenario. It is thus demonstrated that the proposed system could function as a cell at a realistic range, with high data rate and the ability to provide for a large amount of users while limiting the cost of implementation
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Bechadergue, Bastien. "Mesure de distance et transmission de données inter-véhicules par phares à LED." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLV085/document.

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En réponse aux problèmes croissants liés aux transports routiers - accidents, pollutions,congestions - les véhicules à faibles émissions, équipés de systèmes de transports intelligents (ITS)sont progressivement développés. Si la finalité de cette démarche est le véhicule entièrementautonome, on peut néanmoins s'attendre à voir d'abord sur nos routes des véhicules automatisés surdes phases de conduite spécifiques. C'est le cas du convoi automatisé, qui permet à plusieursvéhicules de rouler en convois de manière automatique et donc d'augmenter la capacité des voies decirculation tout en réduisant la consommation de carburant. La fiabilité de cet ITS repose surplusieurs briques technologiques, et en particulier sur la mesure de distance et la transmission dedonnées véhicule-véhicule (V2V).De nombreux systèmes permettent de réaliser ces deux fonctions vitales comme, par exemple, lesradars ou lidars pour la mesure de distance et la technologie IEEE 802.11p pour la communicationvéhiculaire. Si ces différents dispositifs présentent de très bonnes performances, ils sont néanmoinsparticulièrement sensibles aux interférences, qui ne cessent de se multiplier à mesure que le nombrede véhicules équipés augmente et que le trafic est dense. Pour pallier les dégradations deperformances induites par de telles situations, des technologies complémentaires pourraient donc êtreutiles. Le récent développement des diodes électroluminescentes (LED) blanches, en particulier pourl'éclairage automobile, a permis l'émergence des communications optiques visibles sans fil (VLC).Les phares à LED sont alors utilisés pour transmettre des données entre véhicules et avec lesinfrastructures. Malgré la puissance limitée de ces éclairages, plusieurs études ont montré qu'unetransmission de qualité est possible sur quelques dizaines de mètres, faisant de la VLC uncomplément particulièrement intéressant à l'IEEE 802.11p, en particulier pour les convoisautomatisés. Par analogie, on peut alors se demander si les phares ne pourraient pas être aussi utiliséspour mesurer la distance V2V.Le but de cette thèse est donc de proposer et évaluer un système dédié aux situations de convoisautomatisés qui, à partir des phares avant et arrière des véhicules, transmet des données et mesuresimultanément la distance V2V. Dans un premier temps, une étude détaillée de l'état de l'art de laVLC pour la communication V2V est effectuée afin de déterminer l'architecture de base de notresystème. La fonction de mesure de distance est ensuite ajoutée, après une revue des différentestechniques usuelles. Une fois l'architecture générale du système établie, elle est dans un premiertemps validée par des simulations avec le logiciel Simulink. En particulier, les différents paramètressont étudiés afin de déterminer leur impact sur la résolution de mesure de distance et les performancesen transmission de données, puis afin de les optimiser. Si ces simulations fournissent des indicateursimportants pour la compréhension du système, elles ne peuvent cependant remplacer les tests d'unprototype réel. L'implémentation de ce prototype est alors détaillée ainsi que les tests réalisés dansdifférentes configurations. Ces différents tests démontrent l'intérêt des solutions proposées pour lamesure de distance et la communication V2V en convois automatisés
In response to the growing issues induced by road traffic - accidents, pollution, congestion- low-carbon vehicles equipped with intelligent transportation systems (ITS) are being developed.Although the final goal is full autonomy, the vehicles of the near future will most probably be selfdrivingin certain phases only, as in platooning. Platooning allows several vehicles to moveautomatically in platoons and thus to increase road capacity while reducing fuel consumption. Thereliability of this ITS is based on several core technologies and in particular on vehicle-to-vehicle(V2V) distance measurement and data transmission.These two vital functions can be implemented with several kinds of systems as, for instance, radars orlidars for range-finding and IEEE 802.11p-based devices for vehicular communication. Althoughthese systems provide good performances, they are very sensitive to interferences, which may be agrowing issue as the number of vehicles equipped will increase, especially in dense traffic scenario.In order to mitigate the performance degradation occurring in such situations, complementarysolutions may be useful. The recent developments of white light-emitting diodes (LED), especiallyfor the automotive lighting, has allowed the emergence of visible light communication (VLC). WithVLC, the vehicle headlamps and taillights are used to transmit data to other vehicles orinfrastructures. Despite the limited optical power available, several studies have shown thatcommunication over tens of meters are possible with a low bit error rate (BER). VLC could thus bean interesting complement to IEEE 802.11p, especially in platooning applications. By analogy, onecould wonder if the automotive lighting can also be used for V2V range-finding.The goal of this thesis is thus to propose and evaluate a system dedicated to platooning configurationsthat can perform simultaneously the V2V distance measurement and data transmission functionsusing the headlamps and taillights of the vehicles. The first step of this study is thus a detailed stateof-the art on VLC for V2V communication that will lead to a first basic architecture of our system.Then, the range-finding function is added, after a careful review of the classical techniques. Once thegeneral architecture of the system is drawn, it is validated through simulations in the Simulinkenvironment. The different degrees of freedom in the system design are especially studied, in orderfirst to evaluate their impact on the measurement resolution and the communication performances,and then to be optimized. Although these simulations provide crucial keys to understand the system,they cannot replace real prototype testing. The implementation of the prototype is thus fullydescribed, along with the results of the different experiments carried out. It is finally demonstratedthat the proposed solution has a clear interest for V2V range-finding and communication inplatooning applications
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9

Li, Liyi. "Structural, functional analysis of synaptotagmin 1 in synaptic transmission using hippocampal autapses." [S.l.] : [s.n.], 2005. http://webdoc.sub.gwdg.de/diss/2005/liyi.

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Appleton, Catherine. "Life after life imprisonment." Thesis, University of Oxford, 2008. http://ora.ouls.ox.ac.uk/objects/uuid:ee377c75-7a0b-4ee5-9442-39034b5cd8ab.

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Books on the topic "LiFi"

1

Life Lift. Podgorica: Nova knjiga, 2012.

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F, Harrington Robert. Lift for life. Lima, Ohio: Fairway Press, 1995.

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1805-1902, Cartwright Lili, ed. Lili at Aynhoe: Victorian life in an English country house. London: Barrie & Jenkins, 1989.

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52 simple ways to give your spiritual life a lift. Nashville: Oliver-Nelson, 1991.

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A pirate's life: A captain's hat, lift-the-flaps, and stickers inside! [New York, NY: Price Stern Sloan, 2006.

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Mark, Croswell, ed. Lift up a standard: The life and legacy of Ralph C. Horner. [Indianapolis, Ind: Wesleyan Pub. House], 2012.

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Drummond, Andrew. Life after life. [Great Britain]: [s.n.], 1988.

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McCorkle, Jill. Life after life. Waterville, Maine: Thorndike Press, 2013.

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Pendleton, Don. Life to life. New York: Warner Books, 1987.

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Moody, Raymond A. Life after life and reflections on life after life. Carmel, N. Y: Guideposts, 1987.

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Book chapters on the topic "LiFi"

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Chen, Cheng, Mohamed Sufyan Islim, and Harald Haas. "Visible Light Communications and LiFi." In Handbook of Laser Technology and Applications, 443–62. 2nd ed. 2nd edition. | Boca Raton : CRC Press, 2021– |: CRC Press, 2021. http://dx.doi.org/10.1201/9781003130123-31.

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Yin, Liang, and Harald Haas. "Non-Orthogonal Multiple Access in LiFi Networks." In Multiple Access Techniques for 5G Wireless Networks and Beyond, 609–38. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-92090-0_19.

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Ivascu, Cristian-Ovidiu, Doru Ursutiu, and Cornel Samoila. "Improve VLC LiFi Performance for V2V Communication." In Lecture Notes in Networks and Systems, 315–29. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23162-0_29.

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Kalita, Chinmoy Sailendra, and Maushumi Barooah. "LiFi Based Scheme for Handover in VANET: A Proposed Approach." In Communications in Computer and Information Science, 64–71. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-9671-1_5.

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Jiang, Yufei, Majid Safari, and Harald Haas. "Joint Frame Detection and Channel Estimation for DCO-OFDM LiFi Systems." In Ubiquitous Networking, 532–41. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-68179-5_46.

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Yu, Ho Kyung, and Jeong Gon Kim. "Performance Analysis of Single-Pulse Modulation in Factory Environment Based on LiFi Standard." In Advances in Computer Science and Ubiquitous Computing, 45–50. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-15-9343-7_7.

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Sharma, Pradip Kumar, Byoung Wook Kwon, and Jong Hyuk Park. "DSS-SL: Dynamic Signage System Based on SDN with LiFi Communication for Smart Buildings." In Advances in Computer Science and Ubiquitous Computing, 805–10. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-7605-3_128.

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Othman, Norzalina, Lutfil Hadi Ideris, and Zainal Abidin Che Hassan. "Small Scale Prototype Development of Vehicle to Vehicle (V2V) Communication Using the Light Fidelity (LiFi) Technology." In Advanced Structured Materials, 297–304. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-67750-3_25.

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Roelevink, Johanna. "Introduction to the Acts and the Instructions of the Delegates of the States General." In Acta of the Synod of Dordt, LIII—LXII. Göttingen: Vandenhoeck & Ruprecht, 2014. http://dx.doi.org/10.13109/9783666550782.liii.

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Thøgersen, Jacob, and Inge Lise Pedersen. "Lifestyle." In Handbook of Pragmatics, 1–13. Amsterdam: John Benjamins Publishing Company, 2012. http://dx.doi.org/10.1075/hop.16.lif1.

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Conference papers on the topic "LiFi"

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Haas, Harald, and Cheng Chen. "What is LiFi?" In 2015 European Conference on Optical Communication (ECOC). IEEE, 2015. http://dx.doi.org/10.1109/ecoc.2015.7341879.

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Monisha, M., and G. Sudheendra. "Lifi- Light Fidelity Technology." In 2017 International Conference on Current Trends in Computer, Electrical, Electronics and Communication (CTCEEC). IEEE, 2017. http://dx.doi.org/10.1109/ctceec.2017.8455097.

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Haas, Harald, and Tezcan Cogalan. "LiFi Opportunities and Challenges." In 2019 16th International Symposium on Wireless Communication Systems (ISWCS). IEEE, 2019. http://dx.doi.org/10.1109/iswcs.2019.8877151.

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Heidinger, Michael, Florian Hanebeck, Qihao Jin, Rainer Kling, and Wolfgang Heering. "IRFi-SDR: An IR software defined radio." In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864113.

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"Table of contents." In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864114.

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Lorriere, N., G. Chabriel, J. Barrere, M. Pasquinelli, G. Pic, N. Vannieuwenhuyse, L. Escoubas, and J. J. Simon. "LiFi Reception from Organic Photovoltaic Modules Subject to Additional DC Illuminations and Shading Effects." In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864115.

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Bechadergue, Bastien, Carlos Dominguez, Arunkumar Pesala, Preethi Chandra, Gianluca Allegretto, and Sebastien Richer. "Vehicle-to-Vehicle Optical Wireless Communication with the Smart Corner ™ Automotive Headlamp." In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864116.

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Alshehri, Bandar, Karim Dogheche, Aberrahim Ramdane, and El Hadj Dogheche. "Design and Fabrication of Micro LEDs for High Data Rate LiFi Communications." In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864117.

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Albert, Gila, Gabriel Dekel, Sapir Kurland, Moshe Ran, Dror Malka, and Gilad Katz. "Which LiFi's apps may fit mostly to 5G and beyond-5G Technology?" In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864118.

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Lam, E. W., and T. D. C. Little. "Indoor 3D Localization with Low-Cost LiFi Components." In 2019 Global LIFI Congress (GLC). IEEE, 2019. http://dx.doi.org/10.1109/glc.2019.8864119.

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Reports on the topic "LiFi"

1

IMRICH, KENNETH. DWPF Air Lift Pump Life Cycle Evaluation. Office of Scientific and Technical Information (OSTI), March 2004. http://dx.doi.org/10.2172/822142.

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SMITH, MICHAEL. DWPF Glass Air-Lift Pump Life Cycle Testing and Plant Implementation. Office of Scientific and Technical Information (OSTI), May 2004. http://dx.doi.org/10.2172/824423.

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Thayer, Colette. Life Reimagined Life Budget Survey. AARP Research, December 2014. http://dx.doi.org/10.26419/res.00094.001.

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Thayer, Colette. Life Reimagined Life Budget Survey: Infographic. AARP Research, December 2014. http://dx.doi.org/10.26419/res.00094.002.

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Jaboln, Sara. Chai Life. Ames: Iowa State University, Digital Repository, 2014. http://dx.doi.org/10.31274/itaa_proceedings-180814-978.

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Day, L., ed. Life sciences. Office of Scientific and Technical Information (OSTI), April 1991. http://dx.doi.org/10.2172/5109458.

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Marshak, David. Standard Life. Boston, MA: Patricia Seybold Group, December 2001. http://dx.doi.org/10.1571/cs12-20-01cc.

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Doblhammer, Gabriele. The late life legacy of very early life. Rostock: Max Planck Institute for Demographic Research, September 2003. http://dx.doi.org/10.4054/mpidr-wp-2003-030.

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Fang, Hanming, and Zenan Wu. Life Insurance and Life Settlement Markets with Overconfident Policyholders. Cambridge, MA: National Bureau of Economic Research, March 2017. http://dx.doi.org/10.3386/w23286.

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Paul, Satashree. How Early Life Stress Effects Telomeres in Later Life. Spring Library, April 2021. http://dx.doi.org/10.47496/nl.blog.25.

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