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

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 88
Parallel Viterbi decoders 3.3.3.3
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.
Figure 16: Parallel Viterbi Decoding Module.
…, S
N2
,...S
22
,S
12
,S
N1
,….S
21
,S
11
…,D
N
,…,D
2
,D
1
,…
Viterbi
decoder
#1
Viterbi
decoder
#2
Viterbi
decoder
#N
S
11
S
N1
S
21
D
1
D
2
D
N
G1
G2
Z
-1
S
12
G1
G2
Z
-1
Z
-1
G1
G2
S
2
2
S
N2
I or Q channel
2 x Data rate
Data rate