Safran CORTEX Series - Page 5

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
This document is the property of Safran Data Systems.
It cannot be duplicated or distributed without expressed written consent.
Page 5
I/Q merged output ................................................................................................................................... 74 2.2.3.2
Split 2 output (I and Q normal output) .................................................................................................... 74 2.2.3.3
Split 4 output ........................................................................................................................................... 75 2.2.3.4
CADU output formats ............................................................................................................................. 75 2.2.3.5
Specific I/Os (Customers requirements) .................................................................................................... 76 2.2.4
3 FUNCTIONAL DESCRIPTION ....................................................................................................................... 77
MONITORING & CONTROL ............................................................................................................................ 77 3.1
Monitoring.................................................................................................................................................. 77 3.1.1
Control ....................................................................................................................................................... 77 3.1.2
LOGGING ....................................................................................................................................................... 77 3.2
DEMODULATION ............................................................................................................................................ 78 3.3
IF Processing ............................................................................................................................................. 78 3.3.1
Bit Synchronization .................................................................................................................................... 78 3.3.2
Signal Processing .................................................................................................................................... 78 3.3.2.1
Customized FIR Filters ........................................................................................................................... 79 3.3.2.2
General ................................................................................................................................................. 79 3.3.2.2.1
Custom Filters Programming ............................................................................................................... 79 3.3.2.2.2
DEAF Filtering ....................................................................................................................................... 80 3.3.2.3
General ................................................................................................................................................. 80 3.3.2.3.1
Principle of the DEAF.......................................................................................................................... 81 3.3.2.3.2
Use of the DEAF .................................................................................................................................. 81 3.3.2.3.3
XDEAF for reception of dual polarization data transmission ................................................................. 83 3.3.2.4
Adjacent channel rejection ...................................................................................................................... 85 3.3.2.5
Viterbi Convolutional Decoding ................................................................................................................ 86
3.3.3
General .................................................................................................................................................... 86 3.3.3.1
Single or Dual Viterbi Decoder .............................................................................................................. 87 3.3.3.2
Parallel Viterbi decoders ......................................................................................................................... 88 3.3.3.3
Punctured Viterbi .................................................................................................................................... 89 3.3.3.4
PCM Decoding ........................................................................................................................................... 91 3.3.4
DNRZ, QPSK Decoding (DQPSK) ........................................................................................................ 91 3.3.4.1
CCSDS Recommended DNRZ Code in QPSK Mode ......................................................................... 91 3.3.4.1.1
Other Possibilities for DNRZ Codes in QPSK Mode .......................................................................... 92 3.3.4.1.2
DQPSK Configuration ......................................................................................................................... 92 3.3.4.1.3
DNRZ, OQPSK Decoding ...................................................................................................................... 93 3.3.4.2
Most Commonly Used DNRZ Code in OQPSK Mode ....................................................................... 93 3.3.4.2.1
Other Possibilities for DNRZ Codes in OQPSK Mode ....................................................................... 94 3.3.4.2.2
DOQPSK configuration ....................................................................................................................... 94 3.3.4.2.3
I/Q Shift Compensation in OQPSK Mode .................................................................................................. 95 3.3.5
CCITT V.35 De-scrambler ......................................................................................................................... 95 3.3.6
BEM: 4D-8PSK-TCM-DVB-S Reed Solomon Decoding ............................................................................ 95 3.3.7
Introduction ............................................................................................................................................. 95 3.3.7.1
4D-8PSK-TCM Coder ............................................................................................................................ 96 3.3.7.2
Differential Coder ................................................................................................................................ 97 3.3.7.2.1
Convolutional Coder ............................................................................................................................ 98 3.3.7.2.2
Constellation Mapper for 4D-8PSK-TCM ........................................................................................... 99 3.3.7.2.3
Coder/Mapper Implementation at 2, 2.25, 2.5 & 2.75 bits/channel-symbol Efficiency .................... 102 3.3.7.2.4
DVB-S Transport Layer: Reed Solomon Code ..................................................................................... 104 3.3.7.3
Synchronized Randomization ............................................................................................................ 104 3.3.7.3.1
Reed-Solomon encoding .................................................................................................................... 105 3.3.7.3.2
Packets interleaving and synchronization byte insertion ................................................................... 105 3.3.7.3.3
Interface between Trellis Coded Symbols and Bytes ........................................................................ 107 3.3.7.3.4