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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

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