Parallel Viterbi Decoders; Figure 16: Parallel Viterbi Decoding Module - Safran CORTEX Series User Manual

3.3.3.3

Parallel Viterbi decoders

The HDR supports the rate ½ Viterbi parallel processing as specified in the NASA SNUG (450-SNUG).
The number of decoders can be set between N = 1 and 16 on I and Q channels. Dual Viterbi decoding
as described in the previous paragraph can be seen as a particular case of the parallel processing with
N = 1.
The supported symbols sequence is given in the following figure.
I or Q channel
..., S ,....S
,...S ,S ,S ,S
N2 22 12 N1 21
2 x Data rate
© Safran Data Systems – IMP000074 e14r1
HIGH DATA RATE RECEIVER
HDR-4G+ USER'S MANUAL
S
11
-1
Z
S
12
S
21
-1
Z
S
2
11
2
S
N1
-1
Z
S
N2

Figure 16: Parallel Viterbi Decoding Module.

G1
D
Viterbi
decoder
#1
G2
G1
Viterbi
decoder
#2
G2
G1
Viterbi
decoder
#N
G2
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Ref. DTU 100782
Is.Rev 3.5
Date: June 1, 2021
1
D
2
...,D ,...,D
N
Data rate
D
N
Safran Data Systems
.
,...
,D
2 1
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