Figure 6-8. Versafec Codec – 8-Qam, Rate 0.642, 0.711, And 0.780 - Comtech EF Data CDM-840 Installation And Operation Manual

CDM-840 Remote Router
Forward Error Correction
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 6-8. VersaFEC Codec – 8-QAM, Rate 0.642, 0.711, and 0.780
2 3 4 5
Rate Rate
0.711 0.780
8-QAM 8-QAM
2 3 4 5
6 7 8
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
6 7 8
6–11
Revision 0
MN-CDM840
Eb/No in dB
9 10 11 12
Uncoded
8-PSK
9 10 11 12