DVB-S2
Encyclopedia : D : DV : DVB : DVB-S2
DVB-S2 is a newer specification of the DVB-S (Digital Video Broadcasting) standard, ratified by ETSI in March 2005.
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.
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 addition 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 LDPC (low density parity check). Performance should be 0.7 dB close to the Shannon limit.
- Cheap to implement.
- Integrated DVB-DATA.
Reference
- ETSI Standard [TR 102 376 V1.1.1: Digital Video Broadcasting (DVB) User guidelines for the second generation system for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (DVB-S2)]
See also
External links
- [DVB-S2 white paper (final)]
- [White paper on bandwidth efficiency]
- [DVB-S2 — ready for lift off], article in the EBU technical review.
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