Comtech EF Data CDD-562AL Installation And Operation Manual page 234

CDD-562AL/564A/L Multi-Channel Demodulator
Eb/N0 Measurement
Example: In this diagram, the (Co+No)/No measured is 4.6 dB. If Rate 1/2 QPSK is being used, this
would correspond to an E
The exact relationship used to derive the table values is as follows:
E /N = 10 log
b 0 10
Where:
E /N and (Co+No)/No are expressed in dB
b 0
Bits/symbol = 1 for BPSK
Bits/symbol = 2 for QPSK
Bits/symbol = 3 for 8-PSK/8-QAM
Bits/symbol = 4 for 16-QAM
Code Rate for 'uncoded' = 1
/N of approximately 2.6 dB.
b 0
(Co+No/No )/10)
(10 -1) - 10 log (FEC Code Rate) - 10 log
10
B–2
Revision 0
MN-CDD562AL564AL
(bits/symbol)
10