Turbo Decoding; Low Density Parity Check; Bitrate And Overhead - Safran CORTEX RTR NeXt Series User Manual

6.10.3

Turbo decoding

The Turbo decoder is following [AD6] recommendation:
Features supported:

ASM synchronization

Data randomization removal

Payload size : 1784, 3568, 7136, 8920

Code rate = 1/2. (1/3, 1/4, 1/6 are not supported)
For more details, refer to [AD6].
6.10.4

Low Density Parity Check

The LDPC decoder is following [AD1] recommendation:
Features supported:

ASM synchronization

Data randomization removal

Block size : 1024, 4096

Code rate = 1/2, 2/3, 4/5
6.10.5

Bitrate and Overhead

In the E2R7 version and after, the bit rate configured in the demodulator corresponds to the useful bitrate.
The software automatically adjusts internal settings to match the transmitted bit rate if a FEC is activated.
Block
Code Size
(bits)
Viterbi
Reed Solomon 2040
Reed Solomon 2040
Reed Solomon 2040
Reed Solomon 2040
Reed Solomon 2040
Turbo Code 1784
Turbo Code 3568
Turbo Code 7136
Turbo Code 8920
LDPC 1024
LDPC 1024
LDPC 1024
LDPC 4096
LDPC 4096
LDPC 4096
© Safran Data Systems – IMP000074 e14r1
Radio Telemetry Receiver
User's Manual
Interleave
Code ratio
factor
- -
1
2
3
4
5
-
-
-
-
-
-
-
-
-
-
Ref.
Is.Rev
Previous Ref.:
Date:
Expansion
Factor
1/2 2
- 259/223
- 514/446
- 769/669
- 1024/892
- 1279/1115
1/2 3640/1784
1/2 7208/3568
1/2 14344/7136
1/2 17912/8920
1/2 33/16
2/3 25/16
4/5 21/16
1/2 33/16
2/3 25/16
4/5 21/16
Safran Data Systems
This document is the property of
It cannot be duplicated or distributed without expressed written consent.
D104004
07
DTU000567
21/06/2021
Transmitted
Useful Bit
Bit rate
rate (Mbps)
(Mbps)
1.000 2.000
1.000 1.161
1.000 1.152
1.000 1.149
1.000 1.148
1.000 1.147
1.000 2.040
1.000 2.020
1.000 2.010
1.000 2.008
1.000 2.0625
1.000 1.5625
1.000 1.3125
1.000 2.0625
1.000 1.5625
1.000 1.3125
.
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