A study for interactive TV via satellite
| Autor: | Luca Longo, Carlo Elia, Giuseppe Caire, Roberto Viola |
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| Rok vydání: | 1996 |
| Předmět: |
Focus (computing)
Frequency-shift keying business.industry Computer science Time division multiple access Data_CODINGANDINFORMATIONTHEORY Service provider Return channel Transmission (telecommunications) Modulation Electrical and Electronic Engineering Telecommunications business Interactive television Computer network |
| Zdroj: | European Transactions on Telecommunications. 7:335-347 |
| ISSN: | 1541-8251 1124-318X |
| Popis: | The digital compression revolution will offer the possibility of receiving hundreds of TV channels from the same orbital location. Only some of them will be dedicated to traditional television services. The largest part will be utilized for specialized services that will require user interaction. Interaction requires a “reverse channel” from the user site to the service provider premises. In this paper we study the feasibility of such a reverse channel via satellite. After discussing some system options, we focus on the simplest and most attractive one: where the users have the capability of sending information back to the service provider directly through a satellite link. For this solution, we provide a system outline and we present a coding and modulation scheme based on pragmatic-coded non-coherent orthogonal M-FSK concatenated with shortened Reed-Solomon codes which is able to meet the transmission requirements. Next, we address the problem of symbol-timing and carrier frequency offset open-loop estimation for short burst TDMA transmission with non-coherent M-FSK modulation. Finally, we discuss some particular network aspects of such a reverse channel. |
| Databáze: | OpenAIRE |
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