Comtech EF Data CDM-625 - Manual (Page 302)

CDM-625 Advanced Satellite Modem Revision 15
Forward Error Correction Options MN-CDM625
7–30
Figure 7-17. Rate 3/4 QPSK, OQPSK, 8-PSK, 8-QAM, 16-QAM LDPC Codec
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 3/4 QPSK/OQPSK
8-PSK/8-QAM and 16-QAM
1 2 3 4 5 6 7 8 9 10 11 12
BER
Spec limit
Rate 3/4
16-QAM
Spec limit
Rate 3/4
QPSK/OQPSK
Typical
performance
Uncoded
8-PSK
Spec limit
Rate 3/4
8-PSK
8-QAM