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    Visible Light Communications Using Four-Color LEDs

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    Author
    Vangapandu, Sai Rakesh Mohan Krishna
    Issue Date
    2018
    Keywords
    BER
    DMT
    MIMO
    RGBA LEDs
    Visible light communications
    WDM
    Advisor
    Djordjevic, Ivan B.
    
    Metadata
    Show full item record
    Publisher
    The University of Arizona.
    Rights
    Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
    Abstract
    Visible light communications (VLC) technology has gained prominence in the development of high data rate transmission for the fifth generation (5G) networks. VLC technology can be used in conjunction with the existing Wi-Fi technology to improve access and data transmission. In optical wireless communications, LED transmitters are used in applications that desire mobility and the LED divergence enable larger coverage. VLC systems offer simultaneous data transmission and illumination. However, the LED’s limited modulation bandwidth and non-linear distortions pose difficulty in achieving high transmission data rates. Wavelength division multiplexing in VLC (WDM-VLC) can be used improve the data rates to meet gigabit data standards. This thesis work focuses on VLC experiments using WDM, discrete multitone modulation (DMT), and multi-input multi-output (MIMO) techniques. The VLC system is demonstrated over commercial four-color red-green-blue-amber (RGBA) LED transmitters in three cases of interest: (a) a single LED transmitter, (b) repetition encoding, and (c) spatial multiplexing. Our proposed VLC system used bit-power allocation strategies to maximize the data transmission under bit error rate (BER) threshold of 2×10-3, which is the typical hard-decision forward error correction (FEC) threshold.
    Type
    text
    Electronic Thesis
    Degree Name
    M.S.
    Degree Level
    masters
    Degree Program
    Graduate College
    Optical Sciences
    Degree Grantor
    University of Arizona
    Collections
    Master's Theses

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