Mocomtech CDM-QX - Manual (Page 177)

CDM-Qx/QxL Multi-Channel Satellite Modem with DoubleTalk™ Carrier-in-Carrier® Revision 7
Forward Error Correction Options MN/CDMQX.IOM
7–11
Figure 6-4. Comtech EF Data Turbo Product Codec Rate 3/4 QPSK, 8-PSK and 16-QAM
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
Unc oded
BPSK/QPSK
Rate 3/4 QPSK, 8-PSK
and 16-QAM
1 2 3 4 5 6 7 8 9 10 11
BER
Spec limit
Rate 3/4
16-QAM
Spec limit
Rate 3/4
8-PSK
Spec limit
Rate 3/4
QPSK/OQPSK
Ty pical performanc e
Uncoded
8-PSK
Unc oded
16-QAM
Performance with CDM-Qx
Comtech Turbo Product Codec
Spec limit
Rate 3/4
QPSK