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Thèses sur le sujet « Light-based Communication »

Auteur : Grafiati

Publié le 7 juin 2025

Mis à jour le 2 août 2025

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1

Velasquez, Estuardo Rene Garcia. "Sending Location-Based KeysUsing Visible Light Communication." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-310907.

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In this thesis we present a Security Application based on Visible Light Communication(VLC). As VLC continues to develop, the need to protect valuable informationtransmitted using this type of communication is also growing. We aim to protect thisvaluable information by proposing a security application in which the data is encryptedin a multiple-light system and only recoverable in specific locations of a movingpattern within specific time. We use the Shamir Secret Sharing algorithm as basis forthe encryption combined with additional algorithms to provide a more securetransmission. The applicati

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Enlund, Åström Isabelle. "Mobility-based Key Sharing Using Visible Light Communication." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-333031.

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Visible Light Communication (VLC) has become an increasingly interesting topicamong researchers. The LEDs used in VLC have important characteristics which differfrom radio waves, and which enables a vast spectrum to be used with many security aspects. Light cannot pass through walls and can be directed. Directing different light sources to different locations, keys can be distributed to these locations. Using this, a mobility pattern can be defined by a user. This thesis considers the Shamir's Secret Sharing algorithm and how it can be used to create a mobility pattern where each distributed k

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Hilmia, Abdalah. "Sending Location-Based Keys Using Visible Light Communication." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-276338.

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In this thesis we explore the possibilities of using Visible Light Communication (VLC) to build a system that is capable of securely sharing small amounts of data in the form of encryption keys in a boundary defined area. We design and implement the MAC and Physical layers of the system. On the transmission part, the system uses BFSK and Manchester encoding to modulate the signal. The reception is handled in windows of fixed size where the Goertzel algorithm is applied to detect the transmitted frequencies. The transmitters synchronize their transmissions using a simple static scheduling metho

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Mousa, Farag. "Secure visible light communication systems based on the position of the user." Thesis, Northumbria University, 2017. http://nrl.northumbria.ac.uk/36262/.

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In the past few decades, there has been a growing demand for bandwidth in wireless communication systems due to an increase in the number of mobile users, computer network applications and high speed internet access and services. Visible light communication (VLC) is a newly emerging technology in optical wireless communication (OWC) systems to provide both illumination and high-speed data communication. In addition, it can also be used for indoor positioning or localization with wide applications that has merited a number of attractive research studies. However, security in wireless communicat

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Mathews, Abraham. "Smart Home Based Li-Fi System : Stereo Audio & Image Streaming by Visible light." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-32835.

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To light up the world of technology, where wireless communication has bloomed to a great extend which requires a lot of data to be transmitted and received every fraction of the second a new era is coming. Electro-magnetic waves i.e., radio waves are the main way to transmit wireless data but certain limitations are there because radio waves can only support less bandwidth because of compact spectrum availability and intrusions. Visible Light Communication (VLC) has come to take way those issues. The new technology Li-Fi which stands for Light-Fidelity is a new kind of wireless communication s

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Melo, Santos João Miguel. "Hybrid GaN-based optoelectronics for visible light communications." Thesis, University of Strathclyde, 2017. http://digitool.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=27924.

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Development of light-emitting diode technology is driven mainly by the need for efficient solid-state lighting, but it is also creating opportunities for new applications such as visible light communications (VLC). Here, the solid-state visible light sources are used to transmit data with the added requirement of a short excited-state lifetime so that sources can be modulated at high speed. This research focuses on hybrid optical sources for visible light communications with an emphasis on novel formats of colour-converters for multi-wavelength photoluminescence as well as white-light generati

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Sekkiou, Imene. "Design of communication systems based on broadband sources for fiber and free space optical links." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/172542.

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[ES] Las comunicaciones ópticas inalámbricas (OWC) constituyen una tecnología muy prometedora para el desarrollo de futuras comunicaciones inalámbricas. De hecho, ha despertado un interés creciente entre los investigadores y varias empresas de todo el mundo trabajan actualmente en el desarrollo de redes inalámbricas de muy alta velocidad. Las comunidades científica e industrial consideran la OWC como una tecnología complementaria en sus diversas formas: comunicaciones ópticas en el espacio libre (FSO), comunicaciones de luz visible (VLC) o fidelidad de la luz (Li-Fi). El espectro óptico ha sid

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COCONEA, LAURA DANIELA. "Analysis, simulation and testing of ITS applications based on wireless communication technologies." Doctoral thesis, Politecnico di Torino, 2015. http://hdl.handle.net/11583/2598394.

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Intelligent Transportation Systems (ITS) aim to improve road transport safety and efficiency, to manage road networks in the interest of the society and to provide real time responses to events. In order to reach these goals, real time feedback to the drivers is expected through the integration of telecommunications, sensing and information technologies with transport engineering. Wireless communication technologies, that have been used in industrial applications for more than 30 years, play a crucial role in ITS, as based on the concept of multiple devices (on both vehicle and infrastructur

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Zaghloul, Yasser A. "Polarization based digital optical representation, gates, and processor." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/43675.

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A complete all-optical-processing polarization-based binary-logic system, by which any logic gate or processor could be implemented, was proposed. Following the new polarization-based representation, a new Orthoparallel processing technique that allows for the creation of all-optical-processing gates that produce a unique output once in a truth table, was developed. This representation allows for the implementation of all basic 16 logic gates, including the NAND and NOR gates that can be used independently to represent any Boolean expression or function. In addition, the concept of a generaliz

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Chen, Wei-ting, and 陳偉婷. "Illumination Based LED Visible Light Communication: Design and Investigation." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/03415308845903342219.

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碩士<br>國立臺灣科技大學<br>光電工程研究所<br>100<br>In the thesis, LED plays a role in visible light communication as well as indoor lighting. The transmission speed could be upgraded to few Mbps per LED chip. In our experiment, the transmitter path is optimized by using a convergent focal lens with diameter of 55 mm, while the receiver may couple much LED power by using a divergent lens with focal length of 30 mm. In order to acquire sufficient signal power, operational amplifiers are used to improve the sensitivity of photodiode. The white LED used in this experiment is based on mixed light technology usin

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LI, SIOU-JHU, and 李修竹. "Indoor Positioning System based on Visible Light Communication Technology." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/85187944418214426093.

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碩士<br>臺北城市科技大學<br>嵌入式系統產業研發碩士專班<br>101<br>Since GPS system is released to market, booming GPS navigation devices such as smart phones, bring a lot of convenience to people's lives. Aircraft, vessels are no longer to get lost, and you don’t need to check maps again and again when you are driving. Algorithms and sensors are continuous improved, it greatly increasing the accuracy of GPS positioning reach few meters, but GPS system cannot work in the building. So you need another system to guide people in the big building. Many units have started to develop an indoor positioning system to link up

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Chen, Chia-Wei, and 陳佳偉. "Applications and Research of Camera based Visible Light Communication." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/b786xv.

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碩士<br>國立交通大學<br>光電工程研究所<br>105<br>As wireless communication is becoming more and more important in our daily lives, the traditional radio-frequency (RF) communication spectrum is nearly occupied. And the light emitting diode (LED) is replacing the traditional lighting sources in now days. For these two reason, visible light communication (VLC) is the proper solution.Besides, the mobile phone embedded with complementary-metal-oxide-semiconductor (CMOS) camera become common. It is more easy to get camera than photodiode(PD) as receiver. In this thesis, we proposed and demonstrated different tech

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Lin, Tung-Ching, and 林東慶. "High-speed GaN-based Photonic Crystal Light-emitting Diodes for Visible Light Communication Applications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/srw2p5.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>105<br>Recently, GaN based light-emitting-diodes (LEDs) have attracted a lot of attention as they can be applied to visible light communication (VLC) as the transmitter. However, the modulation bandwidth of LEDs is usually limited by the spontaneous carrier lifetime in the multiple quantum wells. Nowadays, much research has been investigated to solve this problem. In this thesis, we discuss the photonic crystal (PhC) structure embedded in LED (PhCLED) which can improve the performance of the devices on high-speed operation due to its unique spatial and temporal mana

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Gao, Wei-Zhe, and 高偉哲. "Mobile device based visible light communication system implementation and application." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/s2fj3g.

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碩士<br>南臺科技大學<br>電子工程系<br>107<br>In this thesis, we design and implement a visible light communication (VLC) system that bases on a mobile device. The proposed VLC system includes a transmitter and a receiver. In the transmitter, we use high power light-emitting diodes (LEDs) as medium to transmit data, and employ ULN2803 Darlington transistor arrays chip as the LED driver. To avoid light flicker caused by transmitting too many consecutive bits of ‘0’ or bits ‘1’, the data is encoded by the Manchester encoding technique. The receiver captures the visible light signals by using the camera of mob

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Su, Yuan-Jun, and 蘇緣峻. "Interference Rejection Using Filter-Based Sensor Array for Visible Light Communication Systems." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/933647.

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碩士<br>國立臺北科技大學<br>電機工程系所<br>99<br>The goal of this thesis is to research into multi-antenna diversity techniques for spectrum sensor array receiver in visible light communication systems and to improve the performance of this system. Conventionally, photoelectric-diodes are implemented to convert optical signals into electronic signals. Since conventional photoelectric-diodes cannot distinguish inputs of different spectra, using conventional photoelectric-diodes have the disadvantage that the system is vulnerable to interference and noise, and hard to achieve wavelength division mult

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Song-Jhe, Lyu, and 呂松哲. "Impact of Nonlinear LED Transfer Function on OFDM-based Visible Light communication." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/44025512132418349918.

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碩士<br>國立雲林科技大學<br>資訊工程系<br>102<br>In the recent years, as production cost of light-emitting diode (LED) is becoming lower and visible light communication (VLC) has a great progress, the studies of VLC have drawn much interest in the literature. Many studies are investigated in the orthogonal frequency-division multiplexing (OFDM) system. However, they are explored in the absence of the nonlinear LED transfer characteristic. On the other hand, we also find that the real coefficients associated with the pair of transform functions (i.e., fast Fourier transform (FFT) and inverse FFT (IFFT)) signi

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Jiang, Ruizhe. "A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel." Thesis, 2020. http://hdl.handle.net/1805/23390.

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Indiana University-Purdue University Indianapolis (IUPUI)<br>Recently witnessed a great popularity of unobtrusive Visible Light Communication (VLC) using screen-camera channels. They overcomes the inherent drawbacks of traditional approaches based on coded images like bar codes. One popular unobtrusive method is the utilizing of alpha channel or color channels to encode bits into the pixel translucency or color intensity changes with over-the-shelf smart devices. Specifically, Uber-in-light proves to be an successful model encoding data into the color intensity changes that only requires over-

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(9166208), Ruizhe Jiang. "A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel." Thesis, 2020.

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Recently witnessed a great popularity of unobtrusive Visible Light Communication (VLC) using screen-camera channels. They overcomes the inherent drawbacks of traditional approaches based on coded images like bar codes. One popular unobtrusive method is the utilizing of alpha channel or color channels to encode bits into the pixel translucency or color intensity changes with over-the-shelf smart devices. Specifically, Uber-in-light proves to be an successful model encoding data into the color intensity changes that only requires over-the-shelf devices. However, Uber-in-light only exploit Multi

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Wu, Tsai-Chen, and 吳采晨. "Laser diode based free-space, underwater, and white-lighting visible light communication." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/30448256244050982547.

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碩士<br>國立臺灣大學<br>光電工程學研究所<br>104<br>Since visible light (wavelength ranging from 350 to 750 nm) communication (VLC) can extend the global high-speed network to specific space, its development of connecting all communication networks in human society is necessary. Using blue laser diode (LD) with higher modulation bandwidth and lower divergence than light emitting diode (LED) can not only enhance the VLC transmission performance but also further perform underwater communication. By further adhering phosphorous glass upon blue LD or mixing the red/green/blue (RGB) LDs, white-lighting source can a

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Wang, Yin-Chen, and 王尹辰. "Studies of Enhancement the Transmission Performance of LED-based Visible Light Communication." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/52030280025852721544.

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碩士<br>國立交通大學<br>光電工程研究所<br>101<br>In recent years, light emitting diodes (LEDs) are being used in various applications such as indicators, lighting display and so on. Using LED in visible light communication (VLC) has attracted much attenuation recently. In this thesis, we experimentally realized several methods to reduce noise interference in VLC, including the following: Manchester encoding, Orthogonal frequency-division multiplexing (OFDM), and non-return-to-zero inverted (NRZI) encoding. Then we propose a data transmission scheme using visible light LEDs with color and dimming control. Dim

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Ying-AnChen and 陳盈安. "Applications of LIDAR and NLOS Communication based on Solar-Blind Ultraviolet Light." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/7pb7zt.

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碩士<br>國立成功大學<br>航空太空工程學系<br>107<br>The purpose of this study is to investigate the performance of solar-blind ultraviolet light applied to the LIDAR (Light Detection and Ranging) system and NLOS (Non-Light-of-Sight) communication system. Solar-blind ultraviolet light with wavelengths from 200nm to 280 nm, due to the absorption by the ozone layer, can hardly reach the earth's surface, hence the name solar-blind. Solar-blind ultraviolet light reacts strongly with the components of the upper and lower layer atmosphere and produces unique absorption and scattering characteristics. It is suitable f

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Chien, Ming-jen, and 簡名仁. "300Mb/s High-Speed LED Visible Light Communication Based on Micro-Projection Architecture." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/53998803120973219951.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>102<br>With the increasing demands on smart mobile phone device in modern society, micro-projection is widely expected to become an essential module in the future smart mobile phone device. In most of current micro-projectors, RGB-based LED has been widely used as the major light sources to perform the color mixture of white light,since using RGB-based LEDs as the light source have the advantages of longevity,low power consumption, and small size compared with other conventional light sources. Moreover, white light LEDs have also been used as the major light source o

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KOU, YING HUNG, and 郭盈宏. "Visible light communication system simulation based on LCD and dual-lens mobile device." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/jy6vdn.

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碩士<br>國立中正大學<br>通訊工程研究所<br>106<br>Visible Light Communication (VLC) has been widely discussed in recent years. The basic concept of VLC is send information using the same light signal while performing illumination. Considering of VLC characteristic, VLC can increase transmission bandwidth and communication security according to the weakness of short-distance communication such as Bluetooth and NFC (Near Field Communication). This paper considers the close-range visible light communication, proposes a new communication system, which uses the difference of the screen brightness of the mobile pho

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Zhao, Shuze. "A Dimmable LED Driver For Visible Light Communication Based On the LLC Resonant Converter." Thesis, 2013. http://hdl.handle.net/1807/43364.

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This work presents a new wireless Visible Light Communication lighting system targeted to future Smart Buildings. A digitally controlled LLC resonant dc-dc converter targeted to white LED luminaires is demonstrated. Visible Light Communication is implemented with minimal incremental cost, by operating the LLC converter in burst mode, without causing any visible disturbance. The converter operates with a regulated average LED current by adjusting the switching frequency, while the burst pulse timing is controlled to minimize the current disturbance and minimize the value of the output capacitor

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Teng, Chiang, and 鄧強. "Experimental Study of RGB LED Visible Light Communication System Based on Micro-Projection Architecture." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/xzcfwd.

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碩士<br>國立臺灣科技大學<br>電子工程系<br>103<br>Since Micro-projection technology for portable communication device application (such as smart phones) has been investigated very actively recently, it is expected that high-speed visible light communication (VLC) technologies based on the light sources of micro-projector i.e. RGB-based LEDs will be integrated into the architecture of micro-projection on portable communication devices. Compared with the conventional white light LED which is composed of blue LED and phosphor limiting the available modulation bandwidth, RGB-based LEDs has the advantages of provi

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Lai, Chih-Han, and 賴芷涵. "High-Speed Indoor LED-based Visible Light Communication using Orthogonal Frequency Division Multiplexing Modulation." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/t5zh4f.

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碩士<br>國立交通大學<br>光電工程研究所<br>106<br>Driven by the enormous growth of mobile data, as expected, the depleting radio frequency (RF) bandwidth has intensified the competetion among wireless service providers and eventaully turned into a hot potato. Using the off-the-shelf phosphor light-emitting diodes (LEDs) and license-free band, visible light communication (VLC) has been emerging as an complementary technology for wireless access network. Typically, however, phosphor LEDs exhibit narrow modulation bandwidth (few to ten MHz) and therby are difficult to support >Gbps traffic rate. Extending modula

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CHANG, HUNG-KAI, and 張紘愷. "Improvement of AH-ARQ Scheme Applied for QR-code-based Visible Light Communication System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/ja6m27.

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碩士<br>國立中正大學<br>通訊工程研究所<br>107<br>In our daily life, data transmission has become important thanks to the developments of communication system based on electromagnetic (EM) techniques. However, the limitations of transmission also appear along with the popularity of wireless communications. Especially, electromagnetic interference (EMI) and frequency spectrum shortage limit the applications of wireless communication in mobile devices. To overcome these limitations, we design a wireless visible light communication (VLC) system applied to the mobile device with liquid-crystal display (LCD) monit

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Chen, Yan-Ren, and 陳衍任. "Error Compensation and Automatic Height Detection with Indoor Positioning System Based on Visible Light Communication." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/kdyje7.

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碩士<br>國立雲林科技大學<br>電子工程系<br>102<br>In recent years, the information and communication technology has been applied to the development of the next generation of smart living space. Due to light-emitting diodes have intelligent lighting fixtures and wireless optical communication property, light-emitting diodes has been regarded as one of the solutions of smart living space. Based on this trend, we propose an indoor positioning system based on visible light signals. Distance between the reference point and the positioning point is obtained by ideal optic signal radiation characteristic, and coordi

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Alkhazragi, Omar. "Wavelength Dependence of Underwater Turbulence Characterized Using Laser-Based White Light." Thesis, 2019. http://hdl.handle.net/10754/631898.

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The means of communication in oceanic environments is currently dominated by sonar. Although it is reliable for long-distance transmission, the vision of internet of underwater things (IoUT) requires an alternate means for high-data-rate transmission. It is also envisaged that a networked underwater and above-water objects, such as sensor nodes, and autonomous underwater vehicles will benefit seafloor exploration. The use of laser-based optical communication is poised to realize this dream while working hand-in-hand with acoustic and radio-frequency technologies from the littoral zone to deep

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Wu, Chun-Jui, and 吳軍銳. "Experimental study of 500 Mb/s high-speed visible light communication system based on RGB LED." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/03776446556414062023.

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碩士<br>國立臺灣科技大學<br>光電工程研究所<br>103<br>Due to the high potential of using micro-projection technology for porta-ble device application, it is expected that high-speed visible communication technologies based on the light sources of micro-projector will be integrated into the architecture of micro-projection. In distinguished with the conventional white light LED which is composed of blue LED and phosphor, this research intends to implement an experimental short-range high-speed visible light communication (VLC) system based on the use of RGB-based LED which has widely employed as the light source

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Alatawi, Abdullah. "Fabrication and Characterization of GaN-Based Superluminescent Diode for Solid-State Lighting and Visible Light Communication." Diss., 2020. http://hdl.handle.net/10754/662640.

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To date, group-III-nitride has undergone continuous improvements to provide a broader range of industrial applications, such as solid-state lighting (SSL), visible light communications (VLC), and light projection. Recently, VLC has attained substantial attention in the field of wireless communication because it offers ~ 370 THz of bandwidth of unregulated visible spectrum, which makes it a critical factor in the evolution of the 5G networks and beyond. GaN-based light-emitting diode (LED) and laser diode (LD) have become increasingly appealing in energy-sufficient SSL replacing conventional l

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JHANG, BO-KAI, and 張柏凱. "Design and Implementation of an Indoor Real-Time Audio Transceiver System Based on Visible Light Communication." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/99wj8q.

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碩士<br>南臺科技大學<br>電子工程系<br>107<br>Abstract With the exponentially growing demand of the wireless equipment, the ultra-high data rate and band width efficiency have attracted an increasing interest in the area of wireless communication techniques. The primary problem with the existing wireless techniques is that the wireless equipment is easily interfered by the electromagnetic interference (EMI) in an indoor environment. To combat this problem, visible light communications technology is the promising wireless communication technique due to its EMI-free, unlicensed spectrum, high data rate, and

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Shiu, Ruei-Jie, and 許睿杰. "Studies of Modulation Formats and Signal Processing Techniques for CMOS Image Sensor Receiver Based Visible Light Communication." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/fkun93.

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碩士<br>國立交通大學<br>光電工程研究所<br>106<br>Nowadays, visible light communication (VLC) has become one of the promising wireless communications, Due to the saturation of frequency bands used by traditional wireless communication technologies VLC can provide extra wireless communication channels by using the visible spectrum. Besides, VLC can provide additional values for lighting and wireless communication industries. By seizing the opportunity the fifth generation mobile communication (5G) integrated with the Internet of Things (IoT), VLC could be part of the crucial and promising issue in communicatio

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Tan, Cheng-Hua, and 譚政華. "An Entrance Control System based on Visible Light Communication to Support One-pass Password and Self-Learning." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/488z3m.

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碩士<br>國立高雄應用科技大學<br>電子工程系碩士班<br>101<br>High-speed switching capability of Light Emitting Diode (LED) conducts the data communication in light. In this thesis, an entrance control system is investigated and developed to validate the feasibility VLCID application in entrance control systems. In this thesis, short-distance light communication technology and embedded system technology are involved to develop a new entrance control system with light keys. The new entrance control system based on short-distance light communication to authenticate the specific light key by the exchange of confidentia

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YE, CHENG-EN, and 葉承恩. "The Investigation of a Concentration Photovoltaic Module Based Laser Wireless Power Transmission and Visible Light Communication System." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/p42c5c.

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碩士<br>國立金門大學<br>電子工程學系碩士班<br>107<br>The aim of this research is to develop a wireless power transmission (WPT) and visual light communication (VLC) hybrid system based on a laser diodes (LD) array and a concentration photovoltaic (CPV) module. The Light Fidelity (Li-Fi), which is one of the novel VLC technology, could simultaneously transmit power and data by a photovoltaic (PV) module receiver. In this study, we further propose using an LD array and a CPV module as the transmitter and receiver to improve the developed Li-Fi system’s power efficiency and data rate. The hardware circuit and com

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"GaN-Based Micro-LED Visible Light Communication: Line-of-Sight VLC with Active Tracking and None-Line-of-Sight VLC Demonstration." Doctoral diss., 2017. http://hdl.handle.net/2286/R.I.45589.

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abstract: Visible light communication (VLC) is the promise of a high data rate wireless network for both indoor and outdoor uses. It competes with 5G radio frequency (RF) system as well. Even though the breakthrough of Gallium Nitride (GaN) based micro-light-emitting-diodes (micro-LEDs) enhances the -3dB modulation bandwidth dramatically from tens of MHz to hundreds of MHz, the optical power onto a fast photo receiver drops exponentially. It determines the signal to noise ratio (SNR) of VLC. For full implementation of the useful high data-rate VLC link enabled by a GaN-based micro-LED, it need

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Ho, Kang-Ting. "Photodetector Characteristics in Visible Light Communication." Thesis, 2016. http://hdl.handle.net/10754/609456.

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Typically, in the semiconductor industry pn heterojunctions have been used as either light-emitting diodes (LED) or photodiodes by applying forward current bias or reverse voltage bias, respectively. However, since both devices use the same structure, the light emitting and detecting properties could be combine in one single device, namely LED-based photodetector. Therefore, by integrating LED-based photodetectors as either transmitter or receiver, optical wireless communication could be easily implemented for bidirectional visible light communication networks at low-cost. Therefore, this diss

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Lin, Wei-Ting, and 林威廷. "An OFDM-based Transceiver for Visible Light Communications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/372p29.

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碩士<br>國立清華大學<br>電機工程學系<br>107<br>In this thesis, we have designed a transceiver for VLC to attain the high-speed transmission. To achieve the goal of high-speed transmission and accommodate different channel decay from different LED, we adopt orthogonal frequency division multiplexing (OFDM) system. However, due to intensity modulation/direct detection (IM/DD) technology, OFDM system is substituted for DC-biased optical OFDM (DCO-OFDM) system. Before designing the system, we set up some parameters to be the specification. First, we use 16-QAM modulation and 1024 points Fast Fourier Transform

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Chang, Yi-Ting, and 張逸廷. "A CDMA-based Indoor Visible Light Communications System for Message Broadcasting." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/50962734927596753293.

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碩士<br>國立交通大學<br>資訊科學與工程研究所<br>101<br>Recently, the technology of visible light communication (VLC) has been widely discussed. Communication through visible light has several advantages, such as freedom of license, line-of-sight security, and less health concern compared to radio-based systems. In addition, the rapid progress of light emitting diode (LED) technology by solid-state lighting (SSL) allows VLC to be easily deployed and integrated with existing lighting infrastructure at low costs. However, VLC network, when integrated with lighting infrastructure, is usually for one-way communicati

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Marcocci, Patrizio. "Vehicular and Positioning Visible Light Systems with Low-cost LED-based Devices." Doctoral thesis, 2019. http://hdl.handle.net/2158/1150562.

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Artificial lighting is everywhere, from the light bulbs on our ceilings to car headlights. This makes Visible Light Communication (VLC) an attracting technology since it uses modulated optical radiation in the visible light spec- trum, exploiting the light emission of LEDs. The main advantage of VLC is that it can provide both standard illumination and data connection. Also VLC systems are suitable for many different applications due to their rela- tively simple design for basic functioning, efficiency and large geographical distribution. Recently both Vehicular VLC (V 2LC) and LED-based Posi-

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Lam, Emily. "Using angle diverse and modulated optical sources for 3D indoor positioning." Thesis, 2020. https://hdl.handle.net/2144/41040.

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Indoor positioning is an enabling technology primed to impact the indoor application space as Global Navigation Satellite Systems (GNSS) did for the outdoor space. Amongst the competing positioning technologies are methods of different mediums: light, radio frequency and ultra-wideband, ultrasonic, and imaging; methods of different modalities: received signal strength, angle-of-arrival, time-of-flight; and methods of different mathematics: trilateration, triangulation, machine learning, and signal processing. Light-based positioning compared to other positioning schemes exploits fixed-locat

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Liu, Yen-Chun, and 劉彥醇. "Studies of Transmission and Demodulation Performance Improvements Using CMOS Rolling Shutter Receiver Based Visible Light Communications." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/397u6m.

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碩士<br>國立交通大學<br>光電工程研究所<br>106<br>The rapid development of modern wireless communication technologies allow people to connect to the Internet nearly anywhere and anytime. The bandwidth demand for wireless communication is growing rapidly. Unfortunately, there is limited available electromagnetic spectrum in the traditional radio-frequency (RF) communications. Visible light communication (VLC) has attracted much attention in recent years. Many literatures indicate that VLC could be a promising solution for the 5G and beyond mobile wireless communication due to the availability of extra electrom

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Wang, Wei-Chung, and 王瑋鈞. "Studies of Signal Processing Schemes to Enhance the Transmission Quality in Smart Phone Based Visible Light Communications." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/h6grxs.

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Holguin, Lerma Jorge Alberto. "High-Speed GaN-Based Distributed-Feedback Lasers and Optoelectronics." Diss., 2020. http://hdl.handle.net/10754/665246.

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Gallium nitride (GaN) is a semiconductor material highly regarded for visible light generation since it provides the most efficient platform for compact violet, blue, and green light emitters, and in turn, high-quality and ubiquitous white lighting. Despite this fact, the potential of the GaN platform has not been fully exploited. This potential must enable the precise control in the various properties of light, realizing functions beyond the conventional. Simultaneously, the field of the telecommunications is looking for candidate technologies fit for wireless transmission in the next generat

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"Study of architectures and protection schemes for high-speed WDM-based passive optical access networks utilizing centralized light sources for colorless optical network units." 2006. http://library.cuhk.edu.hk/record=b5893002.

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Zhang Bo.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2006.<br>Includes bibliographical references (leaves 55-59).<br>Abstracts in English and Chinese.<br>Chapter Chapter 1 --- Introduction to Passive Optical Networks --- p.1<br>Chapter 1.1 --- Passive Optical Network (PON) --- p.2<br>Chapter 1.1.1 --- PON architecture --- p.3<br>Chapter 1.1.2 --- PON benefits --- p.4<br>Chapter 1.2 --- The History of PON --- p.4<br>Chapter 1.3 --- WDM-PON --- p.5<br>Chapter 1.4 --- Outline of This Thesis --- p.8<br>Chapter Chapter 2 --- Previous Schemes for Colorless ONU Operation in WDM-PON

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