Astronomy:DVB-S2X
DVB-S2X is a digital satellite television broadcast standard.
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DVB-S2X is an extension of DVB-S2 satellite digital broadcasting standard. It was standardized by DVB Project[1] in March 2014 as an optional extension of DVB-S2 standard.[2] It became an ETSI standard.[3]
Main features
DVB-S2X increased efficiency up to 51% over DVB-S2.[4]
Improvements include:
- Higher order modulation schemes (64/128/256APSK)
- Smaller roll-off factors of 5%, 10% and 15% (though even legacy DVB-S and DVB-S2 receivers can benefit from it[5])
- Improved filtering enabling smaller carrier spacing
- Channel bonding in order to combine several carriers, increasing efficiency in 'Direct-To-Home' (DTH) applications
Channel bonding helps, particularly for UHDTV services. Statistical multiplexing is often used to allow more television services to fit into a single satellite channel. Statistical multiplexing works best when many television channels can share bandwidth. With UHDTV services, it may be possible to fit only 3 services in a single satellite channel, which reduces the effectiveness of statistical multiplexing. Bonding channels increases the number UHDTV services within the bonded channel, allowing statistical multiplexing to work more efficiently.
Because of a lack of backward compatibility with DVB-S2 decoders, Belgian company Newtec developed the 'DVB-S2plus/Extensions' technology.
Use cases
A possible use case is the launch of UHDTV-1 (e.g., 4k) television services in Ku-/Ka-band with HEVC encoding. [6]
See also
References
- ↑ "DVB - The global standard for digital television - Home" (in en-US). https://dvb.org/.
- ↑ "DVB-S2X". DVB Project. http://www.dvb.org/standards/dvb-s2x.
- ↑ "DVB-S2X specification receives approval from steering board". https://dvb.org/wp-content/uploads/2019/12/dvb_pr241_steering_board_approves_dvb-s2x.pdf.
- ↑ "DVB-S2x demystified". Newtec. http://www.satmagazine.com/story.php?number=826406321.
- ↑ "DVBS/S2 with 5% ROF" (in en). https://www.satexpander.com/dvb-s-s2-with-5-rof.
- ↑ ref, p7
External links
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