Comtech EF Data CDM-625A Installation And Operation Manual page 559

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-5. Viterbi with Concatenated RS 220, 200 Outer Code
2 3 4
Uncoded BPSK/QPSK
Sync
threshold,
Rate 3/4
Sync
threshold,
Rate 7/8
2 3 4
5 6 7
Specification
Limit Rate 1/2
and 220,200
Specification
Limit Rate 3/4
and 220,200
Outer Code
5 6 7
B–23
MN-CDM625A
Eb/No in dB
8 9 10
Viterbi with
concatenated
RS 220,200
Outer Code
Outer Code
Specification
Limit Rate 7/8
and 220,200
Outer Code
8 9 10
Revision 4
11 12
11 12