Comtech EF Data CDM-625 - Manual (Page 296)

CDM-625 Advanced Satellite Modem Revision 15
Forward Error Correction Options MN-CDM625
7–24
Figure 7-11. Rate 21/44 BPSK, QPSK, OQPSK Turbo Product Codec
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 21/44 BPSK/QPSK/OQPSK
1 2 3 4 5 6 7 8 9 10 11 12
BER
Spec limit
Rate 21/44
B/Q/OQPSK
Typical performance
* 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
Notes: