Comtech EF Data CDM-625A Installation And Operation Manual page 521

CDM-625A Advanced Satellite Modem
Appendix B
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 B-4. Viterbi with Concatenated RS 220, 200 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
B–17
Revision 0
MN-CDM625A
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