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CDM-Qx Satellite Modem Revision 5
Forward Error Correction Options MN/CDMQx.IOM
6–15
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 Turbo Product Codec
Rate 1/2 QPSK
Rate 17/18 QPSK
and 8-PSK
1 2 3 4 5 6 7 8 9 10 11 12
BER
Spec limit
Rate 17/18
8-PSK
Spec limit
Rate 17/18
QPSK/OQPSK
Spec limit
Rate 1/2
QPSK/OQPSK
Typical
performance
Uncoded
8-PSK
Performance with CDM-Qx
Figure 6-6. Rate 1/2 QPSK, Rate 17/18 QPSK and Rate 17/18 8-PSK
Spec limit
Rate 1/2
QPSK
Spec limit
Rate 17/18
QPSK