Ahsfmcl--Television is the must popular audiovisual applicatiun ever used. The technoligical headways in digital transmissions allow new interactive services to complement classical Television broadcasts. However, the solutious available need specific infrastructures often making them hard and costly to deploy. MITT is a propositiun for interactive television to he deployed using association of mrrent distribution television systems (e.g., satellite DVB-S, cable DVB-T, TV over xDSL, etc.) and clwieal Internet infrastructure. MITv makes use of the natural association between broadcasted TV programs and associated interactive contents to manage replication of those contents over an adhoc infrastructure. The replication phaTe can be based on IP Multieast over satellite service, providing a high performance and realistic way to convey the interactive content over the geographically distributed replication units. The proximity between replication units and end-users then allow a very high quality for interactive media presentation by the way of an access network such as xDSL. The MlTv system was entirely developed and tested in real conditions through a satellite/xDSL network emulator.Zndex terms-lP multicast, Interactive TV, Caching, DVB, xDSL, Network emulation.
Abstract. Geostationary satellites are an efficient way to provide a large scale multipoint communication service. In the context of reliable multicast communications, a new hybrid satellite/terrestrial approach is proposed. It aims at reducing the overall communication cost using satellite broadcasting only when enough receivers are present, and terrestrial transmissions otherwise. This approach has been statistically evaluated for a particular cost function and appears to be advantageous. Then since the hybrid approach relies on Forward Error Correction, several practical aspects of MDS and LDPC codes are investigated in order to determine impact of code selection.
This paper addresses the problem of group size estimation for hybrid satellite/terrestrial multipoint communications. Estimators based on the maximum likelihood principle are investigated. These estimators assume that a Nack suppression mechanism is implemented at transport layer. The performance of these estimators is studied theoretically and via simulations. The integration of an appropriate group size estimator in a transport mechanism is finally considered.
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