DVB-S2

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DVB-S2 is a newer specification of the DVB-S (Digital Video Broadcasting) standard, ratified by ETSI in March 2005.

1 Specifications and performance
2 Main features:
3 Reference
4 See also
5 External links

Specifications and performance

The authors claim that DVB-S2 performance gain over DVB-S is circa 30%. DVB-S2 is to be introduced now in Europe. On Astra 19.2°E since november 2005 two transponders send in DVB-S2. DVB-S2 in Europe is tightly tied with the introduction of HDTV and H.264.

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Main features:

DVB-S2 combines DVB-S (intended for final consumers) with DVB-DSNG (used by professional users),
Adaptative coding to optimize the use of satellite transponders.
4 modulation modes: QPSK, 8PSK (used in non-linear transponders near to saturation); 16APSK and 32APSK (for professional, semi-linear applications).
Improved rolloff: α = 0.20 and α = 0.25 in adition to the DVB-S α = 0.35.
Forward error correction: DVB-S2 uses a FEC system based on concatenation of the Bose-Chaudhuri-Hochquenghem code with a low density parity check. Performance should be 0.7 dB close to the Shannon limit.
Cheap to implement.
Integrated DVB-DATA.