Comtech EF Data CDM-625A - Page 571

CDM-625A Advanced Satellite Modem MN-CDM625A
Appendix B Revision 4
B–35
Figure B-17. LDPC Codec Rate 2/3 QPSK/OQPSK and 8-PSK/8-QAM
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 LDPC
Rate 2/3 QPSK/OQPSK
and 8-PSK/8-QAM
1 2 3 4 5 6 7 8 9 10 11 12
BER
Spec limit
Rate 2/3
8-PSK
Spec limit
Rate 2/3
QPSK/OQPSK
Typical
performance
Uncoded
8-PSK
Spec limit
Rate 2/3
8-QAM