Document Type

Thesis

Date of Award

5-31-2016

Degree Name

Master of Science in Electrical Engineering - (M.S.)

Department

Electrical and Computer Engineering

First Advisor

Roberto Rojas-Cessa

Second Advisor

Nirwan Ansari

Third Advisor

MengChu Zhou

Abstract

High-Speed trains (HSTs) can travel at speeds up to 430 Km/h. The increasing adoption rate of HSTs, and large number of Internet-connected digital devices, pose a great demand for a fast and reliable Internet connection in high-speed trains. Different radio-frequency (RF) wireless communication systems have been studied for HSTs. However, RF wireless communications in high-speed mobility environments suffer from frequent handovers, penetration loss, and Doppler effect. These problems promote the use of other technologies such as free-space optical (FSO) communications to provide reliable Internet connection for HST’s passengers.

Two different approaches for performing signal handover using FSO technology for ground to train communications in high-speed trains are presented in this thesis. One uses multiple wavelengths in adjacent covered areas and the other uses a single wavelength. Considering that, the optimum distance between ground stations is obtained while considering comprehensive attenuation factors for a realistic estimation of these two approaches.

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