Comtech EF Data CDM-710 Installation And Operation Manual page 107

CDM-710 Broadcast Satellite Modem
Forward Error Correction Options
QPSK 1/4, 1/3 and 2/5 are for information purposes. Es/No for short FECFrame is about 0.3 dB
higher than the standard. Values in the table are approximate.
DVB-S2 Short FECFrame = 16,200 bits
Inner **Es/No
At PER =
Type FEC
10
Code
QPSK 1/4 -1.55
QPSK 1/3 -0.44
QPSK 2/5 0.50
QPSK 1/2 1.80
QPSK 3/5 3.03
QPSK 2/3 3.90
QPSK 3/4 4.83
QPSK 4/5 5.48
QPSK 5/6 5.98
QPSK 8/9 7.00
QPSK 9/10 7.22
8PSK 3/5 6.50
8PSK 2/3 7.62
8PSK 3/4 8.91
8PSK 5/6 10.45
8PSK 8/9 11.79
8PSK 9/10 12.08
16APSK 2/3 10.27
16APSK 3/4 11.51
16APSK 4/5 12.33
16APSK 5/6 12.91
16APSK 8/9 14.19
16APSK 9/10 14.43
32APSK 3/4 14.03
32APSK 4/5 14.94
32APSK 5/6 15.58
32APSK 8/9 16.99
32APSK 9/10 17.35
*The occupied bandwidth is 1.19 x Symbol Rate for 35% and 1.15 x Symbol Rate for 25% taken at
the -10 dB points on the plot of power spectral density.
**Includes implementation loss.
The figures that follow contain the error performance characteristics. To convert Es/No to Eb/No
use Eb/No = Es/No - 10xLog(Spectral Efficiency).
Spectral Normalized
Efficiency Symbol Rate
-7
(bps/Hz)
(= Bit Rate x)
Pilots Off
0.365324 2.737
0.629060 1.590
0.760928 1.314
0.848840 1.178
1.156532 0.865
1.288400 0.776
1.420269 0.704
1.508181 0.663
1.596093 0.627
1.727961 0.579
NA NA
1.725319 0.580
1.922040 0.520
2.118761 0.472
2.381056 0.420
2.577778 0.388
NA NA
2.548792 0.392
2.809662 0.356
2.983575 0.335
3.157488 0.317
3.418357 0.293
NA NA
3.493093 0.286
3.709309 0.270
3.925526 0.255
4.249850 0.235
NA NA
* Occupied Spectral
BW for Efficiency
(bps/Hz)
10 Mbps
(25% Rolloff)
31.479 0.357467
18.281 0.615532
15.113 0.744564
13.548 0.830585
9.944 1.131661
8.926 1.260693
8.097 1.389725
7.625 1.475747
7.205 1.561768
6.655 1.690800
NA NA
6.665 1.692033
5.983 1.884959
5.428 2.077885
4.830 2.335120
4.461 2.528046
NA NA
4.512 2.505223
4.093 2.761633
3.854 2.932574
3.642 3.103514
3.364 3.359924
NA NA
3.292 3.419165
3.100 3.630805
2.930 3.842446
2.706 4.159906
NA NA
7–5
Revision 9
MN/CDM710.IOM
Normalized * Occupied
Symbol Rate BW for
(= Bit Rate x) 10 Mbps
(25% Rolloff)
Pilots On
2.797 32.171
1.625 18.683
1.343 15.445
1.204 13.846
0.884 10.162
0.793 9.122
0.720 8.275
0.678 7.793
0.640 7.363
0.591 6.802
NA NA
0.591 6.797
0.531 6.101
0.481 5.534
0.428 4.925
0.396 4.549
NA NA
0.399 4.590
0.362 4.164
0.341 3.921
0.322 3.705
0.298 3.423
NA NA
0.292 3.363
0.275 3.167
NA NA
0.240 2.764
NA NA