Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels

High-data-rate communications are limited not only by noise but often more significantly by the intersymbol interference (lSI) which arises due to the memory of the dispersive multipath fading channels. The aim of this thesis is to investigate the performance of the Orthogonal Frequency Division...

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Main Author:	Abdo Saeed, Mohammed
Format:	Thesis
Language:	English English
Published:	2003
Subjects:	Multiplexing
Online Access:	http://psasir.upm.edu.my/id/eprint/12211/1/FK_2003_50_A.pdf
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id	my-upm-ir.12211
record_format	uketd_dc
spelling	my-upm-ir.122112011-07-14T05:07:32Z Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels 2003-09 Abdo Saeed, Mohammed High-data-rate communications are limited not only by noise but often more significantly by the intersymbol interference (lSI) which arises due to the memory of the dispersive multipath fading channels. The aim of this thesis is to investigate the performance of the Orthogonal Frequency Division Multiplexing (OFDM) scheme over wideband multipath fading channels. OFDM is a technique that can be used for transmitting data at extremely high rates by means of splitting up the serial data stream into several parallel streams which are transmitted simultaneously on different subcarriers, each occupying a small fraction of the available bandwidth. By inserting guard interval that is longer than the delay spread of the channel between the OFDM symbols, the lSI can be mitigated or totally eliminated.In this thesis, the theoretical description and modeling of dispersive multipath fading channels is presented. A proposed channel model based on Saleh and Valenzuela model is introduced and implemented by computer simulation. The bit-error-rate (BER) performance of the uncoded OFDM system, in terms of energy per bit-to noise ratio (EBNR), is investigated by simulations for different modulation schemes with both coherent and differential detection. The influence of the number of carriers as well as the guard interval duration on the performance is also investigated. We observed that the EBNR required to achieve a certain BER is significantly increased by 8 - 1 0 dB for dense multipath fading channels over that required in additive white Gaussian noise (AWGN) channels due to the decrease of the signal power as a result of increasing the number of paths. In addition, differential modulation improves performance in environments where rapid changes in phase are possible. OFDM can be implemented equally well with coherent (non-differential) modulation and demodulation to maximize the signal-to-noise ratio performance of the system. These performance measures are useful for the design and assessment of high speed indoor wireless communication systems. Multiplexing 2003-09 Thesis http://psasir.upm.edu.my/id/eprint/12211/ http://psasir.upm.edu.my/id/eprint/12211/1/FK_2003_50_A.pdf application/pdf en public masters Universiti Putra Malaysia Multiplexing Faculty of Engineering English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Multiplexing
spellingShingle	Multiplexing Abdo Saeed, Mohammed Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels
description	High-data-rate communications are limited not only by noise but often more significantly by the intersymbol interference (lSI) which arises due to the memory of the dispersive multipath fading channels. The aim of this thesis is to investigate the performance of the Orthogonal Frequency Division Multiplexing (OFDM) scheme over wideband multipath fading channels. OFDM is a technique that can be used for transmitting data at extremely high rates by means of splitting up the serial data stream into several parallel streams which are transmitted simultaneously on different subcarriers, each occupying a small fraction of the available bandwidth. By inserting guard interval that is longer than the delay spread of the channel between the OFDM symbols, the lSI can be mitigated or totally eliminated.In this thesis, the theoretical description and modeling of dispersive multipath fading channels is presented. A proposed channel model based on Saleh and Valenzuela model is introduced and implemented by computer simulation. The bit-error-rate (BER) performance of the uncoded OFDM system, in terms of energy per bit-to noise ratio (EBNR), is investigated by simulations for different modulation schemes with both coherent and differential detection. The influence of the number of carriers as well as the guard interval duration on the performance is also investigated. We observed that the EBNR required to achieve a certain BER is significantly increased by 8 - 1 0 dB for dense multipath fading channels over that required in additive white Gaussian noise (AWGN) channels due to the decrease of the signal power as a result of increasing the number of paths. In addition, differential modulation improves performance in environments where rapid changes in phase are possible. OFDM can be implemented equally well with coherent (non-differential) modulation and demodulation to maximize the signal-to-noise ratio performance of the system. These performance measures are useful for the design and assessment of high speed indoor wireless communication systems.
format	Thesis
qualification_level	Master's degree
author	Abdo Saeed, Mohammed
author_facet	Abdo Saeed, Mohammed
author_sort	Abdo Saeed, Mohammed
title	Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels
title_short	Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels
title_full	Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels
title_fullStr	Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels
title_full_unstemmed	Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels
title_sort	performance evaluation of orthogonal frequency division multiplixing systems over indoor multipath fading channels
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Engineering
publishDate	2003
url	http://psasir.upm.edu.my/id/eprint/12211/1/FK_2003_50_A.pdf
_version_	1747811329185415168

Performance Evaluation Of Orthogonal Frequency Division Multiplixing Systems Over Indoor Multipath Fading Channels

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