Comtech EF Data CDM-625 - Figure 7-20. Versafec Codec - 8-QAM, Rate 0.642, 0.711, and 0.780

CDM-625 Advanced Satellite Modem Revision 13
Forward Error Correction Options MN-CDM625
7–33
Figure 7-20. VersaFEC Codec – 8-QAM, Rate 0.642, 0.711, and 0.780
1E-9
1E-8
1E-7
1E-6
1E-5
1E-4
1E-3
1E-2
1E-1
1 2 3 4 5 6 7 8 9 10 11 12
Eb/No in dB
Uncoded
BPSK/QPSK
Comtech VersaFEC® Codec
Rate 0.642, 0.711, 0.780
8-QAM
1 2 3 4 5 6 7 8 9 10 11 12
BER
Rate
0.711
8-QAM
Rate
0.642
8-QAM
Typical performance show -
guaranteed performance curves
are 0.3 dB to the right
Uncoded
8-PSK
Rate
0.780
8-QAM