Product specifications

CDM-710 Broadcast Satellite Modem Revision 10
Eb/No Measurement MN/CDM710.IOM
The relationship used to derive the table values is as follows (only simple way for DVB-S2):
Eb/No = 10 log
10
(10
(Co+No/No )/10)
-1) - 10 log
10
(Spectral Efficiency)
and:
• Eb/No and (Co+No)/No are expressed in dB
• Spectral Efficiency includes the modulation type, code rate, overhead and
framing and is shown in the tables
The equation above applies to DVB-S and DVB-DSNG, or use the traditional relationship:
Eb/No = 10 log
10
(10
(Co+No/No )/10)
-1) - 10 log
10
(FEC Code Rate) - 10 log
10
(bits/symbol)
• Eb/No and (Co+No)/No are expressed in dB
• FEC Code Rate (Composite) = 3/4*(188/204), 7/8*(188/204) etc.
• Bits/symbol = 2 for QPSK, 3 for 8-PSK, 4 for 16-QAM
• Pay close attention to the sign of the middle term
B–2