Characterization And Performance Analysis For VSAT Systems In Malaysia

Zahriladha, Zakaria (2004) Characterization And Performance Analysis For VSAT Systems In Malaysia. Masters thesis, Universiti Teknologi Malaysia.

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Abstract

Accurate estimations of radio wave propagation impairments that affect link quality and availability, and determinations of the signal performance are essential to design a reliable satellite communications systems and earth terminals networks. Nowadays, the rapid development in communication satellites has brought congestion to the frequency bands below 10 GHz, thus this fact has forced to the utilization of higher frequency bands such as Ku-band (14/12 GHz) and Ka-band (20/30 GHz). However, the transmission quality at these higher frequencies and shorter wavelengths is greatly influenced by rain resulting in signal attenuation and decreased link availability especially in tropical region such as Malaysia. Therefore studies are needed to characterize the propagation effects on earth-satellite paths in order to provide guidelines and indications to the design of future reliable systems on higher frequency bands. VSAT or very small aperture terminal which is a small earth terminal is introduced in this study to analyze the effects of radio wave propagation impairments on the earth-satellite paths. Because of its small size, VSAT allows for wide spread use of satellite services in small business and domestic applications. The study has been carried out based on the VSAT technology owned by Telekom Malaysia (TM) and the MEASAT-1 satellite. Since the TM VSATs are operating at C-band (6/4 GHz), the study is focused on the comparative analysis between Ku-band ( 14/12 GHz) and Ka-band (30/20 GHz) to the existing C-band (6/4 GHz) system. Several stations have been selected for the study namely, Johor Bahru, Kuala Lumpur, Alor Setar, Kuantan, Cameron Highlands and Kota Bahru which represents the geographical location of Peninsular Malaysia. The propagation degradations have been evaluated and predicted based on the model of the Radio Communications Sector of the International Telecommunications Union (ITU-R). An analysis based on carrier-to-noise ratio (C/N) is then performed to determine the performance and viability of the VSAT systems to be operating for each station. The minimum C/N requirement for analog system is 10 dB or for digital system is 6 dB should be fulfilled in order to guarantee a good reception's quality for the VSAT systems. Results for almost all the locations indicate that the Ka-band (30/20 GHz) system suffers drastically with rain attenuation and resulting the C/N to drop below the minimum requirement level. However, the results are exceptional to Cameron Highlands because of its high position for height above sea level as compared to other locations. Further analysis on digital system in term of bit error rate (BER) gives similar conclusion as the C/N.

Item Type: Thesis (Masters)
Uncontrolled Keywords: VSATs (Telecommunication) -- Malaysia, Artificial satellites in telecommunication -- Malaysia
Subjects: T Technology > T Technology (General)
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Divisions: Library > Tesis > FKEKK
Depositing User: Burairah Hussin
Date Deposited: 10 Jun 2015 07:41
Last Modified: 13 Jan 2017 07:14
URI: http://eprints.utem.edu.my/id/eprint/14553
Statistic Details: View Download Statistic

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