CDM-570/570L Satellite Modem with Optional IP Module Revision 4
Forward Error Correction Options MN/CDM570L.IOM
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 i n dB
Specification
Limit Rate 1/2
and 220,200
Outer Code
Uncoded BPSK/QPSK
1 2 3 4 5 6 7 8 9 10 11 12
BER

Vi ter b i with

concatenated

RS 220,200

Outer Code

Com bi ned sync
thr eshold, demod
and Viter bi
Decoder, Rate 1/2
Sync
threshold,
Rate 3/4
Specification
Limit Rat e 3/ 4
and 220,200
Outer Code
Specification
Limit Rat e 7/ 8
and 220,200
Outer Code
Sync
threshold,
Rate 7/8
Typi c al performance
Figure 7-2. Viterbi with concatenated RS Outer Code
7–11