CDM-625A Advanced Satellite Modem
Appendix B
1
1E-1
Uncoded
BPSK/QPSK
1E-2
Rate
0.642
8-QAM
1E-3
1E-4
1E-5
1E-6
1E-7
1E-8
1E-9
1
BER
Figure B-20. VersaFEC Codec Rates 0.642, 0.711, and 0.780 8-QAM
2
3
4
Rate
Rate
0.711
0.780
8-QAM
8-QAM
2
3
4
5
6
7
Comtech VersaFEC® Codec
Rate 0.642, 0.711, 0.780
8-QAM
Typical performance show -
guaranteed performance curves
are 0.3 dB to the right
5
6
7
B–33
MN-CDM625A
Eb/No in dB
8
9
10
Uncoded
8-PSK
8
9
10
Revision 0
11
12
11
12
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