Figure 7-11. Rate 21/44 Bpsk, Qpsk, Oqpsk Turbo Product Codec - Comtech EF Data CDM-625 Installation And Operation Manual

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
1E-8
Typical performance
1E-9
1
BER

Figure 7-11. Rate 21/44 BPSK, QPSK, OQPSK Turbo Product Codec

2 3 4 5
Spec limit
Rate 21/44
B/Q/OQPSK
2 3 4 5
6 7 8
Comtech Turbo Product Codec
Rate 21/44 BPSK/QPSK/OQPSK
6 7 8
7–24
Revision 13
MN-CDM625
Eb/No in dB
9 10 11 12
Notes:
* Rate 21/44 QPSK is
shown as R1/2 on the
front panel
* The OQPSK acquisition
and tracking thresholds
are approx. 1 dB worse
than the QPSK case
9 10 11 12