Abstract

The demand of bandwidth in mobile communication is growing exponentially day-by-day, as the number of users have been increasing drastically over the span of last five years. Fibre optics has attracted much attention due to its promising performance and operational cost reduction. In this thesis, the feasibility of using multimode fibre as an inexpensive cell feed in indoor system is investigated. The proposed architecture is analyzed using signal to noise ratio versus GI multimode fibre profile parameter α, cumulative signal to noise ratio, and multipath fading in indoor environment. The objectives of this thesis are: (i)designing COFDM based radio-over-fibre communication system, (ii)analyzing the downlink and uplink performance considering impairements in the fibre and wireless channels and investigating the effect of core refractive index profile (α) on graded index RoF link, (iii)investigating the effect of COFDM cyclic prefix to the graded index multimode fibre dispersion. The performance is evaluated through theoretical analysis and simulations using Matlab. The downlink and uplink analysis are performed considering all the impairements from the air interface and the RoF link. Thereafter, numerical results are generated for the downlink and uplink to illustrate the performance of the COFDM-RoF architecture.

Highlights

  • Communication is the most natural and social of human functions

  • The signal first goes through the Radio over fibre (RoF) link the air interface

  • The ratio includes the cumulative impairments from the air interface and the RoF link and the nonlinear distortion from the RoF link

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Summary

Introduction

Radio over fibre (RoF) refers to a technique where radio frequency (RF) signals are transmitted over optical fibre to provide wireless communication services. Wireless networks based on RoF technologies have been proposed as a promising costeffective solution to meet ever increasing user bandwidth and wireless demands Since it was first demonstrated for cordless or mobile telephone service in 1990 [5], a lot of research has been carried out to investigate its limitation and develop new and high performance RoF technologies. In this network a central base station (CBS) is connected to numerous functionally simple radio access points (RAPs) via an optic fiber.

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