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CDM-625 Advanced Satellite Modem
Forward Error Correction Options
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 7-10. Rate 1/2 BPSK, QPSK, OQPSK, LDPC coding
2
3
4
5
Rate 1/2 BPSK/QPSK/OQPSK
Spec limit
Rate 1/2
B/Q/OQPSK
2
3
4
5
MN-0000036 (Ref MN/CDM625.IOM)
6
7
8
Comtech LDPC Codec
6
7
8
7–20
Revision 1
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
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