HIGH DATA RATE RECEIVER
HDR-4G+ USER’S MANUAL
Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
© Safran Data Systems – IMP000074 e14r1
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Polarization Combining 3.5
General 3.5.1
The CORTEX HDR allows to combine two IF signals from different polarizations in post-detection
mode. Two combining modes are available:
- Automatic selection of the best channel
- Combining of the two channels, through optimal weighting. In this case up to 3 dB gain can be
achieved when both signals have the same Eb/N0.
The combining system, also named Diversity Combining Unit (DCU), receives data from two
demodulators. It resolves phase ambiguity between the two channels, and deals with the different
locking states possible. Its output feeds a FEC device, followed by a Format Output.
Note: Only DMU1 and DMU3 can be combined in the HDR.
Data Path 3.5.2
When active, the combining system output is routed to the FEC input of the first demodulator while the
data path of second demodulator remains unchanged.
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