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CDD-880 Multi Receiver Router
Appendix B
Figure B-1. The VersaFEC Codes versus Shannon Capacity
Table B-1 specifies the 12 modulations types / code rates that comprise the VersaFEC MODCOD
Set. These chosen modulation types (BPSK, QPSK, 8-QAM and 16-QAM) and code rates afford a
continuous progression of performance in terms of both Eb/No and spectral efficiency –
essential aspects of a well-engineered ACM system.
Modulation
(MODCOD
Code Rate
No.)
BPSK (00)
0.488
QPSK (01)
0.533
QPSK (02)
0.631
QPSK (03)
0.706
QPSK (04)
0.803
8-QAM (05)
0.642
8-QAM (06)
0.711
8-QAM (07)
0.780
16-QAM (08)
0.731
16-QAM (09)
0.780
16-QAM (10)
0.829
16-QAM (11)
0.853
Table B-1. The VersaFEC MODCOD Set
Spectral
Block Size
Efficiency
(kbits)
BER = 5 x 10
(bps/Hz)
0.49
2
1.07
4.1
1.26
4.1
1.41
4.1
1.61
4.1
1.93
6.1
2.13
6.1
2.34
6.1
2.93
8.2
3.12
8.2
3.32
8.2
3.41
8.2
B–2
Typical
Latency at
Eb/No, for
64 kbps, in
-8
milliseconds
(dB)
2.4
26
2.2
53
2.7
59
3.4
62
3.8
66
4.6
89
5.2
93
5.6
97
6.3
125
7.1
129
7.7
131
8.1
132
Revision 2
MN-CDD880
Data Rate, CCM Mode
Minimum
Maximum
(kbps)
(Mbps)
16
2.19
18
4.80
21
5.67
23
6.34
26
7.22
31
8.67
35
9.60
38
10.53
47
13.16
50
14.04
54
14.91
55
15.35
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