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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DEMODULATION UNIT
The demodulation function contains a specific feature, this is at this point of the data processing chain
that the data flow is arranged in order to meet the 8 bits symbol shift special feature for ambiguity
resolution purpose. To properly work it receives the frame synchronisation signals from the “Frame
Sync”. This way it can reorder bits to route the right channel to the right DPU.
The configuration field in the MCS is the I/Q Polarity filed. If the used configuration used is 16QAM, 8
channels we must select the “Ambig 8DPU” item, if the used configuration used is QPSK 4 channels
we must select the “Ambig 4DPU” item and if the used configuration used is QPSK 2channels we
must select the “Ambig DPUA+C” item.
The setting of the demodulator for the 16QAM 8 DPU mode is the following:
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