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Appendix - Overview of the Used Technologies
MDM9000 Satellite Modem
18.1.2 DVB-S2X Standard
This is the new enhanced DVB specification. The new standard allows for using the lower roll offs
(5%, 10% 15%).
Furthermore the DVB-S2X standard introduces a finer MODCOD granularity up to 113 MODCODs
and FEC codes up to 256APSK 11/15 in order to improve the performance of the DVB-S2 standard.
The new standard also includes three frame sizes (normal, short and medium) and it adds additional
standard scrambling sequences.
This standard also optimizes for linear and non-linear satellite links.
Two sets of MODCODs are available:
• One set of MODCODs is optimized for multi-carrier operation of the transponder (linear channel
operation). In multi-carrier operation, the transponder can not be saturated and a given back-off
is needed to avoid intermodulation between the individual carriers in the transponder.
• The second set of MODCODs is optimized for single carrier operation which allows to saturated
the transponder (non-linear channel).
Note that DVB-S2X receivers are also able to receive DVB-S2.
The following figure shows the efficiency fo the DVB-S2X standard compared to the DVB-S2
standard.
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