Comtech EF Data CDM-625A Installation And Operation Manual page 570

CDM-625A Advanced Satellite Modem
Appendix B
1
1E-1
Uncoded
BPSK/QPSK
1E-2
1E-3
1E-4
1E-5
1E-6
1E-7
Typical
performance
1E-8
1E-9
1
BER
Figure B-16. LDPC Codec Rate 1/2 BPSK/QPSK/OQPSK
2 3 4
Spec limit
Rate 1/2
B/Q/OQPSK
2 3 4
5 6 7
Comtech LDPC Codec
Rate 1/2 BPSK/QPSK/OQPSK
5 6 7
B–34
MN-CDM625A
Eb/No in dB
8 9 10 11
Note:
The OQPSK demod
acquisition and tracking
threshold is about 1 dB
worse than the QPSK
case
8 9 10 11
Revision 4
12
12