Comtech EF Data CDM-625A Installation And Operation Manual page 532

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
2 3 4 5
Spec limit
Rate 1/2
B/Q/OQPSK
2 3 4 5
Figure B-15. LDPC Codec Rate 1/2 BPSK/QPSK/OQPSK
6 7 8
Comtech LDPC Codec
Rate 1/2 BPSK/QPSK/OQPSK
6 7 8
B–28
Revision 0
MN-CDM625A
Eb/No in dB
9 10 11 12
Note:
The OQPSK demod
acquisition and tracking
threshold is about 1 dB
worse than the QPSK
case
9 10 11 12