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CDM-Qx Satellite Modem Revision 5
Forward Error Correction Options MN/CDMQx.IOM
6–17
Figure 6-8. 16-QAM Viterbi, Rate 3/4 and Rate 7/8 with 220,200 R-S Outer Code
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
Specification limit Rate
3/4 Viterbi and 220,200
RS Outer Code
Uncoded BPSK/QPSK
Typical
Performance
Specification
limit Rate 7/8
Viterbi and
220,200 RS
Outer Code
1 2 3 4 5 6 7 8 9 10 11 1
2
BER
16-QAM Viterbi, Rate 3/4 and Rate 7/8
with 220,200 RS Outer Code
Uncoded 16-QAM