Comtech EF Data CDM-625A - Manual (Page 694)

CDM-625A Advanced Satellite Modem MN-CDM625A
Appendix M Revision 3
M–14
Table M-4. The VersaFEC-2 ModCod Set – Short Block
ModCod Modulation Code
Rate
Spectral
efficiency,
bps/Hz
Block
size,
bits
Typical *
Es/No
(SNR), for
BER = 1 x 10 -8
(dB)
Latency
at
128 kbps
(ms)
Min.
Data Rate,
CCM Mode
(kbps)
Max.
Data Rate,
CCM Mode
(Mbps)
Min Sym
Rate, ACM
Mode
(ksps)
Max Sym
Rate, ACM
Mode
(Msps)
00 BPSK 0.489 0.489 800 -0.2 16 18.0 2.0 37 1
01 QPSK 0.489 0.977 1600 2.3 30 18.0 2.0 37 1
02 QPSK 0.537 1.075 1760 2.8 33 19.3 2.0 37 1
03 QPSK 0.586 1.173 1920 3.4 36 21.1 2.0 37 1
04 QPSK 0.611 1.221 2000 3.7 37 22.0 2.0 37 1
05 QPSK 0.635 1.270 2080 3.9 38 22.9 2.0 37 1
06 QPSK 0.660 1.319 2160 4.2 39 23.7 2.0 37 1
07 QPSK 0.684 1.368 2240 4.5 41 24.6 2.0 37 1
08 QPSK 0.733 1.466 2400 5.2 43 26.4 2.0 37 1
09 8-ARY 0.521 1.564 2560 5.6 46 28.1 2.0 37 1
10 8-ARY 0.537 1.612 2640 5.9 47 29.0 2.0 37 1
11 8-ARY 0.562 1.686 2760 6.2 49 30.3 2.0 37 1
12 8-ARY 0.586 1.759 2880 6.4 51 31.7 2.0 37 1
13 8-ARY 0.611 1.832 3000 6.6 53 33.0 2.0 37 1
14 8-ARY 0.635 1.906 3120 6.9 55 34.3 2.0 37 1
15 8-ARY 0.660 1.979 3240 7.2 57 35.6 2.0 37 1
16 8-ARY 0.684 2.052 3360 7.5 59 36.9 2.0 37 1
17 8-ARY 0.708 2.125 3480 7.8 61 38.3 2.0 37 1
18 8-ARY 0.733 2.199 3600 8.3 63 39.6 2.0 37 1
19 16-ARY 0.586 2.345 3840 8.7 67 42.2 2.0 37 1
20 16-ARY 0.611 2.443 4000 9.0 70 44.0 2.0 37 1
21 16-ARY 0.635 2.541 4160 9.3 73 45.7 2.0 37 1
22 16-ARY 0.660 2.638 4320 9.7 76 47.5 2.0 37 1
23 16-ARY 0.684 2.736 4480 10.3 79 49.3 2.0 37 1
24 16-ARY 0.708 2.834 4640 10.7 82 51.0 2.0 37 1
25 16-ARY 0.733 2.932 4800 11.0 85 52.8 2.0 37 1
26 16-ARY 0.757 3.029 4960 11.6 88 54.5 2.0 37 1
27 16-ARY 0.782 3.127 5120 12.2 91 56.3 2.0 37 1
28 32-ARY 0.660 3.298 5400 12.8 93 59.4 2.0 37 1
29 32-ARY 0.684 3.420 5600 13.1 96 61.6 2.0 37 1
30 32-ARY 0.708 3.542 5800 13.4 99 63.8 2.0 37 1
31 32-ARY 0.733 3.664 6000 14.0 102 66.0 2.0 37 1
32 32-ARY 0.757 3.787 6200 14.4 105 68.2 2.0 37 1
33 32-ARY 0.782 3.909 6400 14.8 109 70.4 2.0 37 1
34 32-ARY 0.801 4.007 6560 15.2 112 72.1 2.0 37 1
35 32-ARY 0.831 4.153 6800 15.8 117 74.8 2.0 37 1
* Typical Es/No values are shown – guaranteed values are 0.3 dB higher
Note that Es/No (SNR) is used in place of Eb/No, a convention for comparing ACM ModCods. SNR is
defined as:
Es/No = Eb/No + 10 * log
10
(Spectral Efficiency)