DVB-S2X is a digital satellite television broadcast standard. It has been standardised by DVB Project
The latest technology in Satellite broadcasting DVB-S2X is an extension of the DVB-S2. DVB-S2X offers improved performance and features for the core applications of DVB-S2, including Direct to Home (DTH), contribution, VSAT and DSNG.
Compare to DVB-S2, DVB-S2X improvements are :
- Higher Modulation Schemes (64/128/256APSK)
- Smaller Roll-off factors
- Improved filtering making it possible to have smaller carrier spacing
DVB-S2X is based on DVB-S2 specifications but it is better improved then DVB-S2. It uses the proven and powerful LDPC Forward Error Correction (FEC) scheme in combination with BCH FEC as outer code and introduces the following additional elements:
- Smaller roll-off options of 5% and 10% (in addition to 20%, 25% and 35% in DVB-S2)
- A finer gradation and extension of number of modulation and coding modes
- New constellation options for linear and non-linear channels
- Additional scrambling options for critical co-channel interference situations
- Channel bonding of up to 3 channels
- Very Low SNR operation support down to -10 dB SNR
- Super-frame option
DVB-S2X has been introduced at the same time as the new efficient HEVC video coding scheme. It is expected that new satellite receivers will combine these two technologies to make the delivery of HD (High Definition) and especially UHD (Ultra High Definition) services more efficient.
Source : DVB org official site