Abstract
This paper presents an overview of digital satellite communication systems based on low-cost, very small aperture terminals (VSATs) located directly at subscribers' premises. Over the last few years, such VSAT systems have become feasible because of a combination of recent advances in satellite and earth station technology. These include the deployment of higher power satellites, the use of Ku-band (14/12 GHz) frequencies, the availability of lowcast earth station antennas and microwave electronics, along with the development of cost-effective implementations for modulation, spectrum spreading, forward error control (FEC) and protocol processing. Digital communication services which potentially achieve reasonable combinations of VSAT cost and satellite usage are identified for consideration. Specific applications considered are: one-way data distribution, point-to-point data, two-way interactive-data packet networking, digital voice (including telephony and packet voice messaging), and satellite ISDN. App...
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