Comtech EF Data CDM-625A - Manual (Page 553)

CDM-625A Advanced Satellite Modem MN-CDM625A
Appendix B Revision 3
B–17
• VersaFEC-2 adds new circular or quasi-circular constellations for higher-order modulations
(above QPSK) to replace the square VersaFEC constellations.
• Es/No span from -1.3 dB (ModCod 0) to 16.3 dB (ModCod 37), giving an average of approx.
0.45 dB per ModCod, and a 17.6 dB total span.
• The overhead associated with AUPC is eliminated. (A framed mode such as EDMAC is
normally required.)
• Combined AUPC and ACM operation is possible - VersaFEC-2 permits up to 10 dB of AUPC
power increase, followed by 17.6 dB of ACM range, for a total of 27.6 dB of fade protection.
Table B-10. The VersaFEC-2 ModCod Set – Long 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 4800 -1.3 79 18.0 6.1 37 12.5
01 QPSK 0.489 0.977 9600 1.5 153 18.0 12.2 37 12.5
02 QPSK 0.537 1.075 10560 2.0 170 19.3 13.4 37 12.5
03 QPSK 0.586 1.173 11520 2.6 185 21.1 14.7 37 12.5
04 QPSK 0.611 1.221 12000 2.8 193 22.0 15.3 37 12.5
05 QPSK 0.635 1.270 12480 3.2 200 22.9 15.9 37 12.5
06 QPSK 0.660 1.319 12960 3.5 208 23.7 16.5 37 12.5
07 QPSK 0.684 1.368 13440 3.7 215 24.6 17.1 37 12.5
08 QPSK 0.733 1.466 14400 4.4 231 26.4 18.3 37 12.5
09 8-ARY 0.521 1.564 15360 5.1 246 28.1 19.5 37 12.5
10 8-ARY 0.537 1.612 15840 5.4 254 29.0 20.2 37 12.5
11 8-ARY 0.562 1.686 16560 5.6 265 30.3 21.1 37 12.5
12 8-ARY 0.586 1.759 17280 5.8 276 31.7 22.0 37 12.5
13 8-ARY 0.611 1.832 18000 6.0 287 33.0 22.9 37 12.5
14 8-ARY 0.635 1.906 18720 6.2 299 34.3 23.8 37 12.5
15 8-ARY 0.660 1.979 19440 6.5 311 35.6 24.7 37 12.5
16 8-ARY 0.684 2.052 20160 6.9 322 36.9 25.0 37 12.2
17 8-ARY 0.708 2.125 20880 7.2 333 38.3 25.0 37 11.8
18 8-ARY 0.733 2.199 21600 7.5 345 39.6 25.0 37 11.4
19 16-ARY 0.586 2.345 23040 8.1 368 42.2 25.0 37 10.7
20 16-ARY 0.611 2.443 24000 8.6 383 44.0 25.0 37 10.2
21 16-ARY 0.635 2.541 24960 8.9 398 45.7 25.0 37 9.8
22 16-ARY 0.660 2.638 25920 9.2 413 47.5 25.0 37 9.5
23 16-ARY 0.684 2.736 26880 9.6 429 49.3 25.0 37 9.1
24 16-ARY 0.708 2.834 27840 10.0 444 51.0 25.0 37 8.8
25 16-ARY 0.733 2.932 28800 10.5 459 52.8 25.0 37 8.5
26 16-ARY 0.757 3.029 29760 10.9 474 54.5 25.0 37 8.3
27 16-ARY 0.782 3.127 30720 11.4 489 56.3 25.0 37 8.0
28 32-ARY 0.660 3.298 32400 12.0 517 59.4 25.0 37 7.6
29 32-ARY 0.684 3.420 33600 12.5 535 61.6 25.0 37 7.3
30 32-ARY 0.708 3.542 34800 12.9 554 63.8 25.0 37 7.1
31 32-ARY 0.733 3.664 36000 13.3 573 66.0 25.0 37 6.8
32 32-ARY 0.757 3.787 37200 13.7 592 68.2 25.0 37 6.6
33 32-ARY 0.782 3.909 38400 14.2 610 70.4 25.0 37 6.4
34 32-ARY 0.801 4.007 39360 14.7 625 72.1 25.0 37 6.2
35 32-ARY 0.831 4.153 40800 15.2 648 74.8 25.0 37 6.0
36 32-ARY 0.855 4.275 42000 16.0 667 77.0 25.0 37 5.8
37 32-ARY 0.879 4.397 43200 16.7 685 79.2 25.0 37 5.7