Table A-1. Eb/No, Spectral Efficiency And Occupied Bandwidth - Comtech EF Data CDM-710 Installation And Operation Manual

CDM-710/L Broadcast Satellite Modem
Appendix A
Eb/No=Es/No-10
Another useful parameter is the occupied bandwidth between -10 dB
points of the power spectral density, which are approximately:
Occupied Bandwidth = 1.19 x Symbol Rate, for 35% Rolloff
Table A-1 provides the Eb/No, spectral efficiency, and occupied bandwidth for
the CDM-710.
Table A-2 and Table A-3 outline these parameters per the modem's DVB
schemes.
Figure 7-1 through Figure 7-7 illustrate the error performance characteristics.

Table A-1. Eb/No, Spectral Efficiency and Occupied Bandwidth*

Mode Type FEC Code
DVB-S QPSK Conv+RS
QPSK Conv+RS
QPSK Conv+RS
QPSK Conv+RS
QPSK Conv+RS
DVB-DSNG 8PSK Conv+RS
8PSK Conv+RS
8PSK Conv+RS
16QAM Conv+RS
16QAM Conv+RS
* 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%.
(Spectral Efficiency)
Log
= 1.15 x Symbol Rate, for 25% Rolloff
= 1.12 x Symbol Rate, for 20% Rolloff
Inner
Code Eb/No at QEF
Rate
1/2 4.5
2/3 5.0
3/4 5.5
5/6 6.0
7/8 6.4
2/3 6.9
5/6 8.9
8/9 9.4
3/4 9.0
7/8 10.7
A–4
MN/CDM710.IOM
Revision 12
Spectral Normalized
Bandwidth for
Efficiency Symbol Rate
10 Mbps (35%
(bps/Hz) (=Bit Rate x)
0.921569 1.085
1.228758 0.814
1.382353 0.723
1.535948 0.651
1.612745 0.620
1.843137 0.543
2.303922 0.434
2.457516 0.407
2.764706 0.362
3.225490 0.310
Occupied *
Rolloff)
12.913
9.685
8.609
7.748
7.379
6.456
5.165
4.842
4.304
3.689