Title :
HD-SAT modems for the satellite broadcasting in the 20 GHz frequency band
Author :
Combarel, L. ; Lavan, E. ; Dosch, C. ; Palicot, J.
Author_Institution :
Alcatel Espace, Nanterre Cedex, France
Abstract :
We present two satellite modems developed in the frame work of the European RACE II HD-SAT project. We describe the HD-SAT system by presenting briefly the overall system. The propagation conditions in the 20 GHz range are particularly detailed as well as the technical answer: the graceful degradation concept. We deal with the variable bit rate-TCM 8PSK modem. The features of this modem, mainly the variable bit rate possibilities between 85 and 70 Mb/s, are described. We describe the “graceful degradation” modem which uses a hierarchical modulation scheme with time multiplexed modulation
Keywords :
digital television; high definition television; microwave propagation; modems; phase shift keying; satellite communication; television broadcasting; time division multiplexing; trellis coded modulation; 20 GHz; 45 Mbit/s; 70 Mbit/s; European RACE II HD-SAT project; HD-SAT modems; HD-SAT system; SHF; frequency band; graceful degradation modem; hierarchical modulation; propagation conditions; satellite broadcasting; satellite modems; time multiplexed modulation; variable bit rate TCM 8PSK modem; Bit rate; Cable TV; Degradation; Frequency; HDTV; Modems; Power cables; Radio broadcasting; Satellite broadcasting; TV broadcasting;
Conference_Titel :
Consumer Electronics, 1995., Proceedings of International Conference on
Conference_Location :
Rosemont, IL
Print_ISBN :
0-7803-2140-5
DOI :
10.1109/ICCE.1995.517932
