Comtech EF Data CDM-710G - Manual (Page 164)

CDM-710G High-Speed Satellite Modem Revision 1
Forward Error Correction Options MN-CDM710G
11–4
Table 11-2. Occupied Bandwidth for DVB-S2 Short FECFrame = 16,200 bits*
(QPSK 1/4, 1/3 and 2/5 are for information purposes)
Type
Inner
FEC
Code
***Es/No
At PER =
10 -7
Pilots Off Pilots On
Spectral
Efficiency
(bps/Hz)
Normalized
Symbol Rate
(= Bit Rate x)
** Occupied
BW for
10 Mbps
(25% Rolloff)
Spectral
Efficiency
(bps/Hz)
Normalized
Symbol Rate
(= Bit Rate x)
** Occupied
BW for
10 Mbps
(25% Rolloff)
QPSK 1/4 -1.55 0.365324 2.737 31.479 0.357467 2.797 32.171
QPSK 1/3 -0.44 0.629060 1.590 18.281 0.615532 1.625 18.683
QPSK 2/5 0.50 0.760928 1.314 15.113 0.744564 1.343 15.445
QPSK 1/2 1.80 0.848840 1.178 13.548 0.830585 1.204 13.846
QPSK 3/5 3.03 1.156532 0.865 9.944 1.131661 0.884 10.162
QPSK 2/3 3.90 1.288400 0.776 8.926 1.260693 0.793 9.122
QPSK 3/4 4.83 1.420269 0.704 8.097 1.389725 0.720 8.275
QPSK 4/5 5.48 1.508181 0.663 7.625 1.475747 0.678 7.793
QPSK 5/6 5.98 1.596093 0.627 7.205 1.561768 0.640 7.363
QPSK 8/9 7.00 1.727961 0.579 6.655 1.690800 0.591 6.802
QPSK 9/10 7.22 NA NA NA NA NA NA
8PSK 3/5 6.50 1.725319 0.580 6.665 1.692033 0.591 6.797
8PSK 2/3 7.62 1.922040 0.520 5.983 1.884959 0.531 6.101
8PSK 3/4 8.91 2.118761 0.472 5.428 2.077885 0.481 5.534
8PSK 5/6 10.45 2.381056 0.420 4.830 2.335120 0.428 4.925
8PSK 8/9 11.79 2.577778 0.388 4.461 2.528046 0.396 4.549
8PSK 9/10 12.08 NA NA NA NA NA NA
16APSK 2/3 10.27 2.548792 0.392 4.512 2.505223 0.399 4.590
16APSK 3/4 11.51 2.809662 0.356 4.093 2.761633 0.362 4.164
16APSK 4/5 12.33 2.983575 0.335 3.854 2.932574 0.341 3.921
16APSK 5/6 12.91 3.157488 0.317 3.642 3.103514 0.322 3.705
16APSK 8/9 14.19 3.418357 0.293 3.364 3.359924 0.298 3.423
16APSK 9/10 14.43 NA NA NA NA NA NA
32APSK 3/4 14.03 3.493093 0.286 3.292 3.419165 0.292 3.363
32APSK 4/5 14.94 3.709309 0.270 3.100 3.630805 0.275 3.167
32APSK 5/6 15.58 3.925526 0.255 2.930 3.842446 NA NA
32APSK 8/9 16.99 4.249850 0.235 2.706 4.159906 0.240 2.764
32APSK 9/10 17.35 NA NA NA NA NA NA
* Es/No for short FECFrame is about 0.3 dB higher than the standard. Values in the table are
approximate.
** Taken at the -10 dB points on the plot of power spectral density, the occupied bandwidth is
1.19 x Symbol Rate for 35% and 1.15 x Symbol Rate for 25%
*** Includes implementation loss.