Reliable communications at frequencies bands above 25 GHz in the tropics

The use of frequencies in the higher bands could tap upon the large spectrum available for communication use. However, it suffers greater propagation losses, making them unsuitable for long range communication. In addition, heavy tropical rain further reduces the reliability of the link and addition...

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主要作者:	Abu Bakar, Faizah
格式:	Thesis
語言:	English
出版:	2008
主題:	HE Transportation and Communications
在線閱讀:	http://eprints.utm.my/id/eprint/11294/1/FaizahAbuBakarMFKE2008.pdf
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id	my-utm-ep.11294
record_format	uketd_dc
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	HE Transportation and Communications HE Transportation and Communications
spellingShingle	HE Transportation and Communications HE Transportation and Communications Abu Bakar, Faizah Reliable communications at frequencies bands above 25 GHz in the tropics
description	The use of frequencies in the higher bands could tap upon the large spectrum available for communication use. However, it suffers greater propagation losses, making them unsuitable for long range communication. In addition, heavy tropical rain further reduces the reliability of the link and additional link budget has to be set aside for rain fade in order to improve its reliability. Rain attenuation model that has been used widely is currently base on ITU-R model. It gives same rain rate for all places in Malaysia. However, previous study in Malaysia conducted by researchers in UTM shows that rain rate is not the same for different places in Malaysia. It is localized where some places experience heavier rainfall compared to other places. Hence, the ITU-R model does not give an accurate prediction of rain attenuation in Malaysia, where the attenuation is supposed to be localized base on the data of the rain rate. This project is aimed to develop a computer program in order to predict localized rain attenuation. The analysis of calculation to produce rain attenuation is done. The best reduction factor model is chosen to get the most accurate result. Then, the planning is done, followed by the design phase. The most challenging part, which is the development of the program, is done next. To verify the program built, it is tested by entering significant inputs and the outputs are analyzed. As a result, a computer program to predict rain attenuation in Peninsular Malaysia is successfully built. The results produced by the program are compared to the ITU-R model of rain attenuation. The differences are calculated and the outcome shows that ITU-R model is not suitable to be used as a rain attenuation method in Malaysia.
format	Thesis
qualification_level	Master's degree
author	Abu Bakar, Faizah
author_facet	Abu Bakar, Faizah
author_sort	Abu Bakar, Faizah
title	Reliable communications at frequencies bands above 25 GHz in the tropics
title_short	Reliable communications at frequencies bands above 25 GHz in the tropics
title_full	Reliable communications at frequencies bands above 25 GHz in the tropics
title_fullStr	Reliable communications at frequencies bands above 25 GHz in the tropics
title_full_unstemmed	Reliable communications at frequencies bands above 25 GHz in the tropics
title_sort	reliable communications at frequencies bands above 25 ghz in the tropics
granting_institution	Universiti Teknologi Malaysia, Faculty of Electrical Engineering
granting_department	Faculty of Electrical Engineering
publishDate	2008
url	http://eprints.utm.my/id/eprint/11294/1/FaizahAbuBakarMFKE2008.pdf
_version_	1747814835967492096
spelling	my-utm-ep.112942018-10-14T07:21:40Z Reliable communications at frequencies bands above 25 GHz in the tropics 2008-05 Abu Bakar, Faizah HE Transportation and Communications TK Electrical engineering. Electronics Nuclear engineering The use of frequencies in the higher bands could tap upon the large spectrum available for communication use. However, it suffers greater propagation losses, making them unsuitable for long range communication. In addition, heavy tropical rain further reduces the reliability of the link and additional link budget has to be set aside for rain fade in order to improve its reliability. Rain attenuation model that has been used widely is currently base on ITU-R model. It gives same rain rate for all places in Malaysia. However, previous study in Malaysia conducted by researchers in UTM shows that rain rate is not the same for different places in Malaysia. It is localized where some places experience heavier rainfall compared to other places. Hence, the ITU-R model does not give an accurate prediction of rain attenuation in Malaysia, where the attenuation is supposed to be localized base on the data of the rain rate. This project is aimed to develop a computer program in order to predict localized rain attenuation. The analysis of calculation to produce rain attenuation is done. The best reduction factor model is chosen to get the most accurate result. Then, the planning is done, followed by the design phase. The most challenging part, which is the development of the program, is done next. To verify the program built, it is tested by entering significant inputs and the outputs are analyzed. As a result, a computer program to predict rain attenuation in Peninsular Malaysia is successfully built. The results produced by the program are compared to the ITU-R model of rain attenuation. The differences are calculated and the outcome shows that ITU-R model is not suitable to be used as a rain attenuation method in Malaysia. 2008-05 Thesis http://eprints.utm.my/id/eprint/11294/ http://eprints.utm.my/id/eprint/11294/1/FaizahAbuBakarMFKE2008.pdf application/pdf en public masters Universiti Teknologi Malaysia, Faculty of Electrical Engineering Faculty of Electrical Engineering 1. Lehpamer, H. Microwave Transmission Networks Planning, Design, and Deployment. United States: McGraw-Hill. 2004. 2. Yunjiang Liu; Guoce Huang; Shunchun Zhen. Performance Analysis of Ka- Band Satellite Channel Capacity in the Presence of Rain Attenuation. Proceedings of the Microwave and Milimeter Wave Technology, 2004. ICMMT 4th International Conference. 18-21 Aug. IEEE. 2004. 175-177. 3. Freeman, R.L. Radio System Design for Telecommunications. United States: John Wiley & Sons. 1997. 4. Khajepiri, F.; Ghorbanii, A.; Amindavar, H. A new method for estimating rain attenuation at high frequencies. Proceedings of the 9th International Seminar/Workshop on Direct and Inverse Problems of Electromagnetic and Acoustic Wave Theory,2004. 11-14 Oct. IEEE. 2004. 43-46 5. Yagasena, A.; Hassan, S.I.S. Worst-month rain attenuation statistics for satellite Earth link design at Ku-band in Malaysia. Proceedings TENCON 2000. Volume 24-27 Sept.IEEE. 2000. 122-125. 6. Rec. ITU-R PN.837-1. Characteristic of precipitation for propagation modeling. PN Series Volume. ITU. Geneva. 1994. 7. Rec. ITU-R P.837-4. Characteristics of precipitation for propagation modeling. ITU. Geneva. 2003. 8. Crane, K.R. Prediction of the Effects of Rain on Satellite Communication Systems. Proceedings of the IEEE, Vol. 65, No.3. IEEE. 1977. 456-474. 9. MR. PC+ (1995). “Microwave radio path calculations plus”, Version 2.4, Harris Corporation, Farinon Division. 10. Bernhardsen, Tor. Geographic Information Systems, An Introduction. John Wiley & Sons, Inc. Norway. 2001. 11. Worboys,M, Duckham, M. GIS A Computing Perspective. CRC Press. US.2004. 12. Islam, M.R.; Tharek, A.R.; Chebil, J. Comparison between path length reductionfactor models based on rain attenuation measurements in Malaysia. Asia Pacific Microwave Conference. 3-6 Dec. IEEE. 2000. 1556-1560. 13. Moupfouma, F. Improvement of a rain attenuation prediction method for terrestrial microwave links. IEEE Transaction on Antennas and Propagation [legacy, pre-1988] Volume 32. Dec 1984. IEEE. 1368-1372. 14. Rec. ITU-R p.530-12. Propagation data and prediction methods required for the design of terrestrial line-of-sight systems. ITU. Geneva. 2007. 15. Chebil J. Rain Rate and Rain Attenuation Distribution For Microwave Propagation Study in Malaysia. Ph.D. Thesis. Faculty of Electrical Engineering,University of Technology Malaysia (UTM). 1997 16. Chapman, S.J. MATLAB® Programming for Engineers. Second Edition. Canada: Brooks/Cole. 2002.

Reliable communications at frequencies bands above 25 GHz in the tropics

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