Time frequency analysis for wireless channel characterization / Zaiton Sharif

The ability to accurately characterize the wireless communication channel is essential for testing and designing any wireless communication systems. It fulfills the demand for a better quality of communication service in terms of higher bits rate and the use of spread spectrum technology. One of the...

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Main Author:	Sharif, Zaiton
Format:	Thesis
Language:	English
Published:	2015
Subjects:	Wireless communication systems Mobile communication systems Access control
Online Access:	https://ir.uitm.edu.my/id/eprint/15369/1/TP_ZAITON%20SHARIF%20EE%2015_5.pdf
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id	my-uitm-ir.15369
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spelling	my-uitm-ir.153692016-11-23T05:08:55Z Time frequency analysis for wireless channel characterization / Zaiton Sharif 2015 Sharif, Zaiton Wireless communication systems. Mobile communication systems. Access control The ability to accurately characterize the wireless communication channel is essential for testing and designing any wireless communication systems. It fulfills the demand for a better quality of communication service in terms of higher bits rate and the use of spread spectrum technology. One of the challenges for wireless channel characterization is the need to demonstrate an appropriate method to characterize the wireless channel hence, effective channel mitigation technique can be developed to minimize deleterious effect arise from the channel namely the short terms variations due to multipath fading. This propagation environment affects the transmitted signal in terms of scattering, diffraction and reflection as it traveled towards the receiver causing the signals to be received distorted or interfered. Therefore, the central issue in this thesis is to determine appropriate techniques to characterize such a channel. A statistical property was adopted to represent properties of the channel which was categorized under wide sense stationary uncorrelated scattering (WSSUS) conditions. In achieving research objectives, four methods are employed namely Cross Correlation Function (CCF), Cross Ambiguity Function (CAF), Cross Wigner Ville Distribution (CWVD) and Cross S Transform (CST). The transmitted signals used are pass band modulation signals and linear FM signals. CCF and CST can determine the time delay profile of the channel while the other two methods were capable of estimating all the parameters required. Both the CAF and the CWVD are able to describe the signal spreading under multipath condition. The time delay spread is estimated based on peak detection between the paths while Channel Impulse Response (CIR) is estimated based on time marginal. Doppler spread in contrast is estimated from the spread of each path in Doppler axis direction. It was found that all the four methods had estimate the time delay profile correctly while CAF and CWVD with certain specifications had estimated the Doppler spread up to 98% accuracy. CWVD had shown to be better compared to other three methods in terms of computation of the Doppler spread and the duration of the signals used. In conclusion, the methods proposed in the time frequency domain were able to perform the channel characterization under multipath condition regardless of the propagation media encountered and the number of paths existed in the channel. 2015 Thesis https://ir.uitm.edu.my/id/eprint/15369/ https://ir.uitm.edu.my/id/eprint/15369/1/TP_ZAITON%20SHARIF%20EE%2015_5.pdf text en public phd doctoral Universiti Teknologi MARA Faculty of Electrical Engineering
institution	Universiti Teknologi MARA
collection	UiTM Institutional Repository
language	English
topic	Wireless communication systems Mobile communication systems Access control
spellingShingle	Wireless communication systems Mobile communication systems Access control Sharif, Zaiton Time frequency analysis for wireless channel characterization / Zaiton Sharif
description	The ability to accurately characterize the wireless communication channel is essential for testing and designing any wireless communication systems. It fulfills the demand for a better quality of communication service in terms of higher bits rate and the use of spread spectrum technology. One of the challenges for wireless channel characterization is the need to demonstrate an appropriate method to characterize the wireless channel hence, effective channel mitigation technique can be developed to minimize deleterious effect arise from the channel namely the short terms variations due to multipath fading. This propagation environment affects the transmitted signal in terms of scattering, diffraction and reflection as it traveled towards the receiver causing the signals to be received distorted or interfered. Therefore, the central issue in this thesis is to determine appropriate techniques to characterize such a channel. A statistical property was adopted to represent properties of the channel which was categorized under wide sense stationary uncorrelated scattering (WSSUS) conditions. In achieving research objectives, four methods are employed namely Cross Correlation Function (CCF), Cross Ambiguity Function (CAF), Cross Wigner Ville Distribution (CWVD) and Cross S Transform (CST). The transmitted signals used are pass band modulation signals and linear FM signals. CCF and CST can determine the time delay profile of the channel while the other two methods were capable of estimating all the parameters required. Both the CAF and the CWVD are able to describe the signal spreading under multipath condition. The time delay spread is estimated based on peak detection between the paths while Channel Impulse Response (CIR) is estimated based on time marginal. Doppler spread in contrast is estimated from the spread of each path in Doppler axis direction. It was found that all the four methods had estimate the time delay profile correctly while CAF and CWVD with certain specifications had estimated the Doppler spread up to 98% accuracy. CWVD had shown to be better compared to other three methods in terms of computation of the Doppler spread and the duration of the signals used. In conclusion, the methods proposed in the time frequency domain were able to perform the channel characterization under multipath condition regardless of the propagation media encountered and the number of paths existed in the channel.
format	Thesis
qualification_name	Doctor of Philosophy (PhD.)
qualification_level	Doctorate
author	Sharif, Zaiton
author_facet	Sharif, Zaiton
author_sort	Sharif, Zaiton
title	Time frequency analysis for wireless channel characterization / Zaiton Sharif
title_short	Time frequency analysis for wireless channel characterization / Zaiton Sharif
title_full	Time frequency analysis for wireless channel characterization / Zaiton Sharif
title_fullStr	Time frequency analysis for wireless channel characterization / Zaiton Sharif
title_full_unstemmed	Time frequency analysis for wireless channel characterization / Zaiton Sharif
title_sort	time frequency analysis for wireless channel characterization / zaiton sharif
granting_institution	Universiti Teknologi MARA
granting_department	Faculty of Electrical Engineering
publishDate	2015
url	https://ir.uitm.edu.my/id/eprint/15369/1/TP_ZAITON%20SHARIF%20EE%2015_5.pdf
_version_	1783733378572353536

Time frequency analysis for wireless channel characterization / Zaiton Sharif

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