DVB-S2X
This article has multiple issues. Please help improve it or discuss these issues on the talk page. (Learn how and when to remove these messages)
|
DVB-S2X is a digital satellite television broadcast standard.
| List of digital television broadcast standards |
|---|
| DVB standards (countries) |
| ATSC standards (countries) |
|
| ISDB standards (countries) |
| DTMB standards (countries) |
| DMB standard (countries) |
| Codecs |
|
| Terrestrial Frequency bands |
| Satellite Frequency bands |
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
[edit | edit source]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
[edit | edit source]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
[edit | edit source]References
[edit | edit source]- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ ref, p7
