Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Visible light communication"”.
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High bandwidth neural interfacing using visible light communication
… optogenetics, which allow increasingly precise light mediated activation of nerve cells, the preference for mice was further reinforced where they are the primary animal of choice. However, the majority of currently available wireless devices are too big and heavy to allow the freely moving …
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High-Speed Organic Photodetectors for Visible Light Communication
… conventional rigid electronics. In recent years, visible light communication (VLC) has attracted considerable interest for use in in-home and sensor networks. Organic optoelectronic devices such as organic light-emitting diodes (OLEDs) and organic photodetectors (OPDs) have great potential for VLC …
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Simulation, performance and interference analysis of multi-user visible light communication systems
… of each medium. This study considers Visible Light Communications (VLC), which is expected to coexist with legacy and future radio frequency (RF) media. While most of the research on VLC has been done on optimizing the physical medium, research on higher network layers is only …
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A Machine Learning Based Visible Light Communication Model Leveraging Complementary Color Channel
… 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 …
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Design and implementation of a methodology to characterize indoor visible light communication channels
Understanding the channel behavior in communication systems is important for ensuring reliable and robust connectivity. This is also true for Visible Light Communication systems in different environments and scenarios. In this work, we develop an adaptable, simple, and reliable method to quantify, …
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Improvements of VLC (Visible Light Communication) transmissions under illumination constraints : theoretical studies and experiments
Les réseaux de communication en lumière visible (VLC) s’appuyant sur l’utilisation de diodes électroluminescentes (LED) bénéficient actuellement d’un intérêt grandissant, en partie grâce à leur robustesse face aux interférences électromagnétiques, leur large bande disponible non-régulée, leur …
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A new optimization uniformity for indoor visible light communication systems using optical attocells configuration
… Therefore, an alternative technology called visible light communications (VLC) was adopted to overcome these challenges. This technology is expected to support 5G and beyond due to its high and free frequency offered, as well as robust security. The main problem of this research is, the …
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Multiple-input multiple-output visible light communication receivers for high data-rate mobile applications
Visible light communication (VLC) is an emerging form of optical wireless communication that transmits data by modulating light in the visible spectrum. To meet the growing demand for wireless communication capacity from mobile devices, we investigate multiple-input multiple-output (MIMO) VLC to …
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Fast-Response Switching-Mode Power Converters/Amplifiers for Envelope Tracking Applications and Visible Light Communication
… emergentes como la comunicación por luz visible (VLC). Para mejorar el rendimiento de los LPAs, las técnicas de seguimiento de envolvente (ET) han sido ampliamente utilizadas en transmisores RF, modulando la tensión de alimentación en función de la envolvente de la señal. En VLC, que …
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Magnetic Communication in Harsh Environments Employing High-Sensitive Wideband Magnetic Field Sensors
… many transmission media other than air, current communication systems are unable to provide sufficiently fast and stable data transmission for modern applications. Examples include underground and underwater communication, as well as data transmission in process engineering, e.g., communication …
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GaN-based distributed feedback laser diodes and their applications
… frequency laser diodes (LDs) operating in the visible region of the electromagnetic spectrum, arising from the various potential applications, most notably in atomic cooling, visible light communication (VLC), medical diagnostics, and spectroscopy. This thesis investigates Gallium Nitride (GaN) …
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Convertidores conmutados de potencia para transmisores de comunicación por luz visible
… en entornos cerrados. La comunicación por luz visible (Visible Light Communication, VLC) es una de las opciones más prometedoras para reducir la saturación de espectro RF. Este sistema de comunicación inalámbrica utiliza el amplio y libre espectro de luz visible (430-750 THz) para transmitir la …
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Linear Mode CMOS Compatible p-n Junction Avalanche Photodiode for Smart-lighting Applications
<p>There is a need in emerging smart lighting concepts for a high-speed sensing capability to enable adaptive lighting (smart spaces) and visible light communication. One approach to address this need is to design and manufacture a novel complementary-metal—oxide—semiconductor (CMOS) compatible, …
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Coexistence of directional and non-directional technologies in 6G wireless dense networks
… we consider dense deployment of directional visible light APs. Firstly, we analyze the performance of a visible light communication (VLC) link and propose algorithmic methods as well as novel receiver structures to enhance its quality. Secondly, we study handover algorithms and investigate an …
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Heterogeneous integration of optical wireless communications within next generation networks
… needed to satisfy demand. Optical wireless (OW) communication offers vast unused spectrum and high area spectral efficiency. In this work, optical cells are envisioned as supplementary access points within heterogeneous RF/OW networks. These networks opportunistically offload traffic to optical …
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Power scaling and nonlinear conversion in fiber-based sources at novel wavelengths
… and enable further applications in imaging, communication, and material processing. This dissertation focuses on different ways to increase the power of fiber-based laser systems at novel wavelengths outside the typical gain emission spectrum of rare-earth gain dopants. The first part of this …
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Transmission Capacity Improvement for Single Photon Avalanche Diode-based Optical Communication Using PAM Modulation
… transmission capacity improvement in optical communication links due to the use of single photon avalanche diode (SPAD) optical receivers. Currently, for non-optically amplified optical communication links that use intensity modulation with direct detection, the highest optical sensitivity is …
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Investigations into the physical layer of underwater networks to enhance channel capacity and performance.
… that uses high data rate wireless visible light communication to transmit information through the underwater environment towards the floating sink nodes on the surface. This link is supported by optic fibre and artificial intelligence to connect source nodes to each other with smart …