Safran CORTEX Series - Single or Dual Viterbi Decoder; Figure 15: Viterbi Decoding Module. Single & Dual Operating Modes

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 87
Single or Dual Viterbi Decoder 3.3.3.2
The Viterbi decoding module can operate either in single mode or in dual mode:
 In the single mode, there is only one Viterbi decoder connected to the Demodulator module (I
& Q output channels of the demodulator are connected to G1 & G2 inputs of the Viterbi
decoder).
 In the dual mode, the Viterbi decoding module has two separate Viterbi decoders on I and Q
Channels.
QPSK, OQPSK
Viterbi
decoder
G1
G2
I channel
Q channel
Data
IF input
Vector Demodulator Viterbi Decoding Module
QPSK, OQPSK
UQPSK,
BPSK (I only)
Viterbi
decoder
G1
G2
I channel
Q channel
I channel
Q channel
IF input
Vector Demodulator
Viterbi Decoding Module
Viterbi
decoder
Z
-1
G1
G2
Z
-1
Figure 15: Viterbi Decoding Module. Single & Dual Operating Modes