Figure 59: Example Of 3 Dgus Merging For Simulation Of Independent I/Q/C Transmission In 8Psk; Figure 60: Example Of 3 Dgus With Different Offsets - Safran CORTEX Series User Manual

DGU1
Max : 1,6 Gbps
DGU2
Max : 1,6 Gbps
DGU3
Max : 1,6 Gbps

Figure 59: Example of 3 DGUs merging for simulation of independent I/Q/C transmission in 8PSK

The total number of data units that can be connected simultaneously to a modulating unit can be 1, 2, 3
or 8.
Given a modulation order n (ex: 3 in 8PSK):

I/Q/C... synchronization is guaranteed only when the number of DGUs is equal to n

the convention for bit to symbol mapping is: DGU1  I, DGU2  Q, DGU3  C (or Z) and so
on.
Multi-DGU support is enabled by adjusting the number of DGUs in the modulator's GUI or the TCP/IP
interface.
Each data unit has an adjustable starting offset, in bits. This enables to offset multiple data streams
with a predefined scheme in order to ease multi-channel ambiguity resolution at the receiving end.
Offset DGU1
Offset DGU2
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
I
PCM
Q
TCM
C
ASM
ASM
ASM
Offset DGU3

Figure 60: Example of 3 DGUs with different offsets

Ref.
Is.Rev
Date:
8PSK
Symbols
Modulator
Max : 4,8 Gbps
data
data
data
Safran Data Systems
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DTU 100782
3.5
June 1, 2021
To IF1 and/or IF2
.
Page 166