Paradise P300 User Manual
Page 162
C
%
N
N
C
N
'
E
S
N
0
E
t
N
0
E
Dec
N
0
E
b
N
0
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
f
Rate: +0.58dB
(219,201,9): +0.37dB
8PSK: -4.77dB
b
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
b
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