Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM

Simulation approaches using MATLAB for wavelet based OFDM, particularly in DWT-OFDM as alternative substitutions for Fourier based OFDM are demonstrated. Conventional OFDM systems use IFFT and FFT algorithms at the transmitter and receiver respectively to multiplex the signals and transmit them sim...

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Main Authors:	Abdullah, Khaizuran, Hussain, Zahir M.
Format:	Book Chapter
Language:	English
Published:	InTech 2011
Subjects:	TK5101 Telecommunication. Including telegraphy, radio, radar, television
Online Access:	http://irep.iium.edu.my/35320/ http://irep.iium.edu.my/35320/ http://irep.iium.edu.my/35320/ http://irep.iium.edu.my/35320/1/khaizuran.pdf

id	iium-35320
recordtype	eprints
spelling	iium-353202014-03-08T21:45:20Z http://irep.iium.edu.my/35320/ Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM Abdullah, Khaizuran Hussain, Zahir M. TK5101 Telecommunication. Including telegraphy, radio, radar, television Simulation approaches using MATLAB for wavelet based OFDM, particularly in DWT-OFDM as alternative substitutions for Fourier based OFDM are demonstrated. Conventional OFDM systems use IFFT and FFT algorithms at the transmitter and receiver respectively to multiplex the signals and transmit them simultaneously over a number of subcarriers. The system employs guard intervals or cyclic prefixes (CP) so that the delay spread of the channel becomes longer than the channel impulse response. The system must make sure that the cyclic prefix is a small fraction of the per carrier symbol duration. The purpose of employing the CP is to minimize inter-symbol interference (ISI). However a CP reduces the power efficiency and data throughput. The CP also has the disadvantage of reducing the spectral containment of the channels. Due to these issues, an alternative method is to use the wavelet transform to replace the IFFT and FFT blocks. The wavelet transform is referred as Discrete Wavelet Transform OFDM (DWT-OFDM). By using the transform, the spectral containment of the channels is better since they are not using CP. The wavelet based OFDM (DWT-OFDM) is assumed to have ortho-normal bases properties and satisfy the perfect reconstruction property. We use different wavelet families and compare with conventional FFT-OFDM system. BER performances of both OFDM systems are also obtained. It is found that the DWT-OFDM platform is superior as compared to others as it has less error rate, especially using bior5.5 or rbior3.3 wavelet family. InTech 2011-08-29 Book Chapter PeerReviewed application/pdf en http://irep.iium.edu.my/35320/1/khaizuran.pdf Abdullah, Khaizuran and Hussain, Zahir M. (2011) Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM. In: Discrete wavelet transforms: algorithms and applications. InTech, Rijeka, Croatia, pp. 57-66. ISBN 9789533074825 http://www.intechopen.com/books/discrete-wavelet-transforms-algorithms-and-applications/simulation-of-models-and-ber-performances-of-dwt-ofdm-versus-fft-ofdm 10.5772/20260
repository_type	Digital Repository
institution_category	Local University
institution	International Islamic University Malaysia
building	IIUM Repository
collection	Online Access
language	English
topic	TK5101 Telecommunication. Including telegraphy, radio, radar, television
spellingShingle	TK5101 Telecommunication. Including telegraphy, radio, radar, television Abdullah, Khaizuran Hussain, Zahir M. Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM
description	Simulation approaches using MATLAB for wavelet based OFDM, particularly in DWT-OFDM as alternative substitutions for Fourier based OFDM are demonstrated. Conventional OFDM systems use IFFT and FFT algorithms at the transmitter and receiver respectively to multiplex the signals and transmit them simultaneously over a number of subcarriers. The system employs guard intervals or cyclic prefixes (CP) so that the delay spread of the channel becomes longer than the channel impulse response. The system must make sure that the cyclic prefix is a small fraction of the per carrier symbol duration. The purpose of employing the CP is to minimize inter-symbol interference (ISI). However a CP reduces the power efficiency and data throughput. The CP also has the disadvantage of reducing the spectral containment of the channels. Due to these issues, an alternative method is to use the wavelet transform to replace the IFFT and FFT blocks. The wavelet transform is referred as Discrete Wavelet Transform OFDM (DWT-OFDM). By using the transform, the spectral containment of the channels is better since they are not using CP. The wavelet based OFDM (DWT-OFDM) is assumed to have ortho-normal bases properties and satisfy the perfect reconstruction property. We use different wavelet families and compare with conventional FFT-OFDM system. BER performances of both OFDM systems are also obtained. It is found that the DWT-OFDM platform is superior as compared to others as it has less error rate, especially using bior5.5 or rbior3.3 wavelet family.
format	Book Chapter
author	Abdullah, Khaizuran Hussain, Zahir M.
author_facet	Abdullah, Khaizuran Hussain, Zahir M.
author_sort	Abdullah, Khaizuran
title	Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM
title_short	Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM
title_full	Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM
title_fullStr	Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM
title_full_unstemmed	Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM
title_sort	simulation of models and ber performances of dwt-ofdm versus fft-ofdm
publisher	InTech
publishDate	2011
url	http://irep.iium.edu.my/35320/ http://irep.iium.edu.my/35320/ http://irep.iium.edu.my/35320/ http://irep.iium.edu.my/35320/1/khaizuran.pdf
first_indexed	2023-09-18T20:50:39Z
last_indexed	2023-09-18T20:50:39Z
_version_	1777409971583975424

Simulation of models and BER performances of DWT-OFDM versus FFT-OFDM

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