Please use this identifier to cite or link to this item: https://dspace.iiti.ac.in/handle/123456789/16439
Title: Advanced techniques for enhancing performance in visible light communication systems
Authors: Sharma, Anupama
Supervisors: Bhatia, Vimal
Keywords: Electrical Engineering
Issue Date: 30-Apr-2025
Publisher: Department of Electrical Engineering, IIT Indore
Series/Report no.: TH707;
Abstract: With the increase in high-speed-data demand for the upcoming fifth generation (5G) and beyond communication systems visible light communications (VLC) has emerged as a low-cost, green, and secure technology complementary to the currently congested traditional radio frequency (RF) communications owing to its wide license-free spectrum. In VLC, data transmission is achieved by modulating the intensity of light emitted from light-emitting diodes (LEDs). Using LEDs as transmitters, VLC enables simultaneous data communication and illumination. Despite VLC’s promise as a viable supplement to RF-based communication systems, the performance of a VLC system is significantly limited by several factors, such as: (a) multiplicative fading distortion due to user mobility and multipath between receiver and transmitter, (b) nonlinear characteristics of an LED, (c) presence of thermal and ambient noise, (d) absence of a direct link, and (e) limited coverage as visible light can not penetrate obstacles and is reflected back due to the high penetration loss. Moreover, the illumination requirements of LEDs pose a challenge to the practical deployment of VLC. The aforementioned VLC channel impairments significantly degrade the achievable bit error rate (BER) performance, and cause a significant performance-gap between the promised and the achieved sum rate of VLC based systems.
URI: https://dspace.iiti.ac.in:8080/jspui/handle/123456789/16439
Type of Material: Thesis_Ph.D
Appears in Collections:Department of Electrical Engineering_ETD

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