Figure 7-4. Viterbi With Concatenated R-S Outer Code - Comtech EF Data CDM-625 Installation And Operation Manual

CDM-625 Advanced Satellite Modem
Forward Error Correction Options
1
1E-1
1E-2
1E-3
1E-4
Combined sync
1E-5
threshold, demod
and Viterbi
Decoder, Rate 1/2
1E-6
1E-7
Typical performance
1E-8
1E-9
1
BER

Figure 7-4. Viterbi with Concatenated R-S Outer Code

2 3 4 5
Uncoded BPSK/QPSK
Sync
threshold,
Rate 3/4
Sync
threshold,
Rate 7/8
2 3 4 5
6 7 8
Specification
Limit Rate 1/2
and 220,200
Outer Code
Specification
Limit Rate 3/4
and 220,200
Outer Code
6 7 8
7–17
Revision 13
MN-CDM625
Eb/No in dB
9 10 11 12
Viterbi with
concatenated
RS 220,200
Outer Code
Specification
Limit Rate 7/8
and 220,200
Outer Code
9 10 11 12