Date of Award

January 2017

Document Type

Thesis

Degree Name

Master of Engineering (MEngr)

Department

Electrical Engineering

First Advisor

Saleh Faruque

Abstract

Visible light communication—(VLC) provides wide bandwidth and high security

capabilities for free space optical communication. This thesis presents the key concepts,

underlying principles and practical applications of visible light communications. In

particular, this thesis focuses on the received power distribution pattern and signal to noise

ratio for line-of-sight indoor and vehicular applications. Several methods are used to

modify the SNR and power distribution levels. It is shown that in the absence of

obstruction, the optical footprint is nearly circular and offers a platform for large- scale

deployment in commercial environments, which is similar to micro and Pico cells.

By studying various kinds of commonly used VLC channel analysis: diffuse and

line of sight channels, a simple improved indoor and intra-vehicular VLC transmission

model for power distribution and SNR is presented. Employing optical wireless

communications within the vehicle not only enhances user mobility, but also alleviates

radio frequency interference, and lowers system cost through the utilization of license free

spectrum. Moreover, a solution to increase the received power by changing the semi angle

at half power is presented. The simulation results show the improved received power

distribution and SNR. A VLC system, based on color-shift-keying (CSK) modulation and

code-division multiple-access (CDMA) is presented. CSK–CDMA VLC system is used to

enhance the VLC system capacity and mitigate single color light interference, which allows

multiple users to access the network.

Download

Share

COinS