Quantum and Evolution Series Installation and Operating Handbook
7-46
Description:
Selects the modulation used for the carrier. (In DVB-S2 IP
multistreaming mode then there will be one of these screens for each
stream, as each stream can have a separate modulation associated with
it.) Trade-off between bandwidth efficiency, resilience to noise, and
power required. Except for the lowest of data rates, where BPSK
reduces the effects of system phase noise, the higher modulation
schemes are preferred for bandwidth efficiency.
Edit-Tx-Modulation-Advanced Menu
This menu can be selected (when user level is set to
Advanced
) following the setting of the
modulation type. It contains the following options:
•
Symbol mapping.
This determines how data is mapped to signal constellations in
QPSK mode.
•
Bit order
. This controls whether I and Q bits are swapped in BPSK mode.
Edit-Tx-Modulation-Advanced-I/Q Symbol Mapping Screen
Options:
IESS compatible
OM-73 compatible
Factory default:
IESS compatible
Description:
Determines how data is mapped to signal constellations in QPSK mode.
Advanced: 1:Symbol mapping
2:Bit order
I/Q symbol mapping: [IESS compatible]
1:IESS compatible
2:OM-73 compatible
