Type of Document Master's Thesis Author Kunchaicharoenkul, Kanokporn URN etd-09182008-063236 Title An educational VSAT system for Thailand Degree Master of Science Department Electrical Engineering Advisory Committee
Advisor Name Title Pratt, Timothy J. Committee Chair Bostian, Charles W. Committee Member Safaai-Jazi, Ahmad Committee Member Keywords
- very small aperture terminal (VSAT)
Date of Defense 1996-09-05 Availability restricted Abstract
Very small aperture terminal (VSA T) networks offer great opportunities to combine satellite technology and the needs of education in Thailand. An educational VSAT network for Thailand needs a central hub station in Bangkok and seven remote sites with VSAT equipment. The network supports two way compressed video, voice and data links between the central hub and VSAT sites.
This thesis examines rain margin, system availability, VSAT antenna size and transponder power utilization in an educational VSAT system using Ku-band. Demand assignment multiple access (DAMA) and single channel per carrier (SCPC) transmission techniques work well for multiple access purposes and minimizes the cost of the space segment. The moving picture expert group-2 (MPEG-2) system is the best choice of compression system in this design.
The final performance analysis shows that with the THAICOM-l satellite and 2-Watt VSAT transmitters, and 1.8m or 2.4m VSAT antennas, VSAT-to-hub links can be established using the full transponder power with significant rain margins. Typical outage times for this system are 98.5% for the hub-to-VSAT links and 95.0% for the VSAT-to-hub links.
Filename Size Approximate Download Time (Hours:Minutes:Seconds)
28.8 Modem 56K Modem ISDN (64 Kb) ISDN (128 Kb) Higher-speed Access LD5655.V855_1996.K863.pdf 3.93 Mb 00:18:10 00:09:21 00:08:10 00:04:05 00:00:20next to an author's name indicates that all files or directories associated with their ETD are accessible from the Virginia Tech campus network only.
If you have questions or technical problems, please Contact DLA.