Figure B-4. Versafec Codec – 8-Qam, Rate 0.642, 0.711, And 0.780 - Comtech EF Data CDD-880 Installation And Operation Manual

CDD-880 Multi Receiver Router
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-4. VersaFEC Codec – 8-QAM, Rate 0.642, 0.711, and 0.780
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–5
MN-CDD880
Eb/No in dB
8 9 10 11
Uncoded
8-PSK
8 9 10 11
Revision 2
12
12