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P300H P300 Series Modem Installation and Operating Handbook Page 162
8.12.5 Tables to Convert (C+N)/N to Eb/No
4.6 2.75
4.8 3.05
Adjust for Adjust for Adjust for
modulation: FEC Rate: RS Codec:
BPSK: -0dB ½ Rate: +3.0dB (n,k,t)=
QPSK: -3.0dB ¾ Rate: +1.25dB (126,112,7): +0.51dB
OQPSK: -3.0dB
Rate: +0.58dB (219,201,9): +0.37dB
8PSK: -4.77dB
Rate: +1.76dB (225,205,10): +0.40dB
5.0 3.35
5.2 3.64
5.4 3.92
5.6 4.20
5.8 4.47
6.0 4.74
6.2 5.01
6.4 5.27
6.6 5.53
6.8 5.78
7.0 6.03
7.2 6.28
7.4 6.53
7.6 6.77
7.8 7.01
8.0 7.25
8.2 7.49
8.4 7.72
8.6 7.95
8.8 8.19
9.0 8.42
9.2 8.64
9.4 8.87
9.6 9.10
9.8 9.32
10.0 9.54
10.5 10.09
11.0 10.64
11.5 11.18
12.0 11.72
12.5 12.25
13.0 12.78
13.5 13.30
14.0 13.82
14.5 14.34
15.0 14.86
15.5 15.38
16.0 15.89
16.5 16.40
17.0 16.91
17.5 17.42
18.0 17.93
18.5 18.44
19.0 18.94
19.5 19.45
>20 =(C+N) / N
(error <0 .04dB)
Example: 8SPK with
Rate TCM FEC, & RS=(219,201,9)
(C+N)/N= C/N= 8PSK so 2/3 Rate FEC, so RS Code (219,201,9) so
8.4dB 7.72dB subtract 4.77dB add 1.76dB add 0.37dB
Measure Look up Calculate Eb/No = C/N - 2.64dB