Mitigation of am interference in digital transmission

The plain-old-telephone-system (POTS) is now increasingly used to carry high-speed data such as for Internet purpose. However, problem can occur if the telephone network is in close proximity to an AM radio transmitter, transmitting high power signal at a frequency which overlaps the bandwidth...

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Main Author:	Sulaiman, Erwan
Format:	Thesis
Language:	English English English
Published:	2004
Subjects:	TK Electrical engineering Electronics Nuclear engineering
Online Access:	http://eprints.uthm.edu.my/7643/1/24p%20ERWAN%20SULAIMAN.pdf http://eprints.uthm.edu.my/7643/2/ERWAN%20SULAIMAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7643/3/ERWAN%20SULAIMAN%20WATERMARK.pdf
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id	my-uthm-ep.7643
record_format	uketd_dc
spelling	my-uthm-ep.76432022-09-08T02:16:44Z Mitigation of am interference in digital transmission 2004-03 Sulaiman, Erwan TK Electrical engineering. Electronics Nuclear engineering TK5101-6720 Telecommunication. Including telegraphy, telephone, radio, radar, television The plain-old-telephone-system (POTS) is now increasingly used to carry high-speed data such as for Internet purpose. However, problem can occur if the telephone network is in close proximity to an AM radio transmitter, transmitting high power signal at a frequency which overlaps the bandwidth of the Internet transmission. The interfering electromagnetic field can induced enough current and voltage in the telephone network and causing significant data errors. This report presents a study on the effects of high-powered AM transmission at 576 kHz on a digital transmission system. A GTEM Cell was used to generate the 576kHz clectric field intensity varying from lV/m to 15 V/m with 80% amplitude modulation. The electric field is imposed on a section of the cable and the Bit Error Rate (BER) is noted using Data Tools 5000. Shielding technique was employed using four conducted materials (soft steel, hard steel, aluminum and copper) in order to test the attenuation of the electric field reaching the cable. Measured results showed that copper (a= 5.87 x 107 S/m, fr =1) can reduce up to 70% of the BER. The relationship between electric field E and BER for copper is expressed as BER = 2 x 10~5 e0-3"^' +2.48x10"^ indicating that the BER increases exponentially with the magnitude of the applied electric field. It is obvious from the work done in this project that any network situated near a high-powered electromagnetic field transmitter should employ a good shielded cabling system. It is recommended that further study need to be carried out to find ways of mitigating the effects of the interfering field such filtering and grounding. 2004-03 Thesis http://eprints.uthm.edu.my/7643/ http://eprints.uthm.edu.my/7643/1/24p%20ERWAN%20SULAIMAN.pdf text en public http://eprints.uthm.edu.my/7643/2/ERWAN%20SULAIMAN%20COPYRIGHT%20DECLARATION.pdf text en staffonly http://eprints.uthm.edu.my/7643/3/ERWAN%20SULAIMAN%20WATERMARK.pdf text en validuser mphil masters Kolej Universiti Teknologi Tun Hussein Onn Fakulti Kejuruteraan Elektrik dan Elektronik
institution	Universiti Tun Hussein Onn Malaysia
collection	UTHM Institutional Repository
language	English 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 Sulaiman, Erwan Mitigation of am interference in digital transmission
description	The plain-old-telephone-system (POTS) is now increasingly used to carry high-speed data such as for Internet purpose. However, problem can occur if the telephone network is in close proximity to an AM radio transmitter, transmitting high power signal at a frequency which overlaps the bandwidth of the Internet transmission. The interfering electromagnetic field can induced enough current and voltage in the telephone network and causing significant data errors. This report presents a study on the effects of high-powered AM transmission at 576 kHz on a digital transmission system. A GTEM Cell was used to generate the 576kHz clectric field intensity varying from lV/m to 15 V/m with 80% amplitude modulation. The electric field is imposed on a section of the cable and the Bit Error Rate (BER) is noted using Data Tools 5000. Shielding technique was employed using four conducted materials (soft steel, hard steel, aluminum and copper) in order to test the attenuation of the electric field reaching the cable. Measured results showed that copper (a= 5.87 x 107 S/m, fr =1) can reduce up to 70% of the BER. The relationship between electric field E and BER for copper is expressed as BER = 2 x 10~5 e0-3"^' +2.48x10"^ indicating that the BER increases exponentially with the magnitude of the applied electric field. It is obvious from the work done in this project that any network situated near a high-powered electromagnetic field transmitter should employ a good shielded cabling system. It is recommended that further study need to be carried out to find ways of mitigating the effects of the interfering field such filtering and grounding.
format	Thesis
qualification_name	Master of Philosophy (M.Phil.)
qualification_level	Master's degree
author	Sulaiman, Erwan
author_facet	Sulaiman, Erwan
author_sort	Sulaiman, Erwan
title	Mitigation of am interference in digital transmission
title_short	Mitigation of am interference in digital transmission
title_full	Mitigation of am interference in digital transmission
title_fullStr	Mitigation of am interference in digital transmission
title_full_unstemmed	Mitigation of am interference in digital transmission
title_sort	mitigation of am interference in digital transmission
granting_institution	Kolej Universiti Teknologi Tun Hussein Onn
granting_department	Fakulti Kejuruteraan Elektrik dan Elektronik
publishDate	2004
url	http://eprints.uthm.edu.my/7643/1/24p%20ERWAN%20SULAIMAN.pdf http://eprints.uthm.edu.my/7643/2/ERWAN%20SULAIMAN%20COPYRIGHT%20DECLARATION.pdf http://eprints.uthm.edu.my/7643/3/ERWAN%20SULAIMAN%20WATERMARK.pdf
_version_	1747831171235971072

Mitigation of am interference in digital transmission

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