Uplink channel power control improvement in DS-CDMA system using channel predictions

In cellular systems all Mobile’s Station (MS) signals should arrive to Base Station (BS) at equal power, if not the weaker one will be blocked and the strong signals will interference with each other. The research areas include coding and improving power control for uplink channel schemes in cell...

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Main Author:	A. Othman, Ibtesam
Format:	Thesis
Language:	English English
Published:	2013
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.uthm.edu.my/1921/1/24p%20IBTESAM.%20A.%20OTHMAN.pdf http://eprints.uthm.edu.my/1921/2/IBTESAM.%20A.%20OTHMAN%20WATERMARK.pdf
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id	my-uthm-ep.1921
record_format	uketd_dc
spelling	my-uthm-ep.19212021-10-12T04:38:50Z Uplink channel power control improvement in DS-CDMA system using channel predictions 2013-01 A. Othman, Ibtesam TK Electrical engineering. Electronics Nuclear engineering TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television In cellular systems all Mobile’s Station (MS) signals should arrive to Base Station (BS) at equal power, if not the weaker one will be blocked and the strong signals will interference with each other. The research areas include coding and improving power control for uplink channel schemes in cellular systems. Commonly the uplink channel power control schemes utilizes Signal to Interference Ratio (SIR) to design a Power Control Command (PCC) to adjust the transmit power of the mobile station in cellular systems. Conventional SIR based uplink channel power control schemes updates the transmitting power based on the current channel state, in the fact the state of channel will be changed when the transmission is made; the channel is already in its next state. The state is different from previous one. That causes the SIR to drop or rise drastically and lead to Near-Far effect interference resulting in power escalation and making the DSCDMA system go unstable. To overcome these problems, a new approach method has been developed, based on linear quadratic Gaussian (LQG) control and Extended Kalman filter for channel prediction, this method dependent on the channel state instead of the current. Using the proposed method the next state of uplink channel can be predicted and update the power accordingly. This will give us a more stable SIR behavior and leads to stable DS-CDMA system. The simulation of this research is performed using Matlab to show the result of building a DS-CDMA system link with existing SIR based uplink channel power control schemes, implementing the predictive approach for uplink channel power control achieved the signal to interference ratio (SIR) as close as possible to the predefine level in order to maximize a DS-CDMA systems capacity and performance. That is clearly shown in the results when compared with the conventional methods. 2013-01 Thesis http://eprints.uthm.edu.my/1921/ http://eprints.uthm.edu.my/1921/1/24p%20IBTESAM.%20A.%20OTHMAN.pdf text en public http://eprints.uthm.edu.my/1921/2/IBTESAM.%20A.%20OTHMAN%20WATERMARK.pdf text en validuser mphil masters Universiti Tun Hussein Malaysia Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English English
topic	TK Electrical engineering Electronics Nuclear engineering TK Electrical engineering Electronics Nuclear engineering
spellingShingle	TK Electrical engineering Electronics Nuclear engineering TK Electrical engineering Electronics Nuclear engineering A. Othman, Ibtesam Uplink channel power control improvement in DS-CDMA system using channel predictions
description	In cellular systems all Mobile’s Station (MS) signals should arrive to Base Station (BS) at equal power, if not the weaker one will be blocked and the strong signals will interference with each other. The research areas include coding and improving power control for uplink channel schemes in cellular systems. Commonly the uplink channel power control schemes utilizes Signal to Interference Ratio (SIR) to design a Power Control Command (PCC) to adjust the transmit power of the mobile station in cellular systems. Conventional SIR based uplink channel power control schemes updates the transmitting power based on the current channel state, in the fact the state of channel will be changed when the transmission is made; the channel is already in its next state. The state is different from previous one. That causes the SIR to drop or rise drastically and lead to Near-Far effect interference resulting in power escalation and making the DSCDMA system go unstable. To overcome these problems, a new approach method has been developed, based on linear quadratic Gaussian (LQG) control and Extended Kalman filter for channel prediction, this method dependent on the channel state instead of the current. Using the proposed method the next state of uplink channel can be predicted and update the power accordingly. This will give us a more stable SIR behavior and leads to stable DS-CDMA system. The simulation of this research is performed using Matlab to show the result of building a DS-CDMA system link with existing SIR based uplink channel power control schemes, implementing the predictive approach for uplink channel power control achieved the signal to interference ratio (SIR) as close as possible to the predefine level in order to maximize a DS-CDMA systems capacity and performance. That is clearly shown in the results when compared with the conventional methods.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	A. Othman, Ibtesam
author_facet	A. Othman, Ibtesam
author_sort	A. Othman, Ibtesam
title	Uplink channel power control improvement in DS-CDMA system using channel predictions
title_short	Uplink channel power control improvement in DS-CDMA system using channel predictions
title_full	Uplink channel power control improvement in DS-CDMA system using channel predictions
title_fullStr	Uplink channel power control improvement in DS-CDMA system using channel predictions
title_full_unstemmed	Uplink channel power control improvement in DS-CDMA system using channel predictions
title_sort	uplink channel power control improvement in ds-cdma system using channel predictions
granting_institution	Universiti Tun Hussein Malaysia
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2013
url	http://eprints.uthm.edu.my/1921/1/24p%20IBTESAM.%20A.%20OTHMAN.pdf http://eprints.uthm.edu.my/1921/2/IBTESAM.%20A.%20OTHMAN%20WATERMARK.pdf
_version_	1747830881877229568

Uplink channel power control improvement in DS-CDMA system using channel predictions

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