Safran CORTEX CRT Quantum User Manual page 166

c- External Input to Viterbi Decoders (TMU table/offset 26 = 2. GUI: Frame Sync. Input = Ext. Vit.
1) :
PCM/PM,
IF inputs
BPSK,
QPSK,
Aux. inputs
OQPSK
demodulator
& B/S
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© Safran Data Systems
COMMAND RANGING & TELEMETRY UNIT CORTEX
CRT QUANTUM USER'S MANUAL
(Option)
Q in I in
I rail
BP, DM-M
decoder
Figure 41: TM Chain : I/O Ports (HBW direct PCM with dual Viterbi)
Channel and phase ambiguities are solved by the I/Q interleave function (prior frame
synchronization) in the following cases:
- OQPSK with dual differential encoding,
- OQPSK with dual [convolutional + differential] encoding.
Test points and external input to the Frame Synchronizer or Viterbi Decoder are available if
one of the downlink data I/Os Test Sets is enabled. See section 2.3.4.2, Annex 5 and TMU
monitoring table, status offset 26 for more details.
Hard decision applies to external input to the Viterbi decoders (scenario c).
Auxiliary inputs: restricted to noise & spurious-free signal with limited amplitude variations.
Direct input to the Bit Synchronizer: Not available.
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Viterbi differential
decoder decoder
Viterbi differential
decoder decoder
(Option)
differential
encoder
Safran Data Systems
.
Ref. DTU 100042
Is.Rev. 5.17
Date: Dec.
03, 2021Sept. 30, 2021
Frame
Synchronizer
differential
encoder
invert/
swap
interleaving
I out Q out
(Option)
Page 86