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SDM-309B Satellite Modem
MN/U-SDM309B Rev. #
Conversion Of (S+N)/N TO S/N And Eb/N0 For Various Code Rates
(dB)
Code Rate 1/2
(S+N)/N
S/N
4.0
1.8
4.5
2.6
5.0
3.3
5.5
4.1
6.0
4.7
6.5
5.4
7.0
6.0
7.5
6.6
8.0
7.3
8.5
7.8
9.0
8.4
9.5
9.0
10.0
9.5
10.5
10.1
11.0
10.6
11.5
11.2
12.0
11.7
12.5
12.2
13.0
12.8
13.5
13.3
14.0
13.8
14.5
14.3
15.0
14.9
15.5
15.4
16.0
15.9
16.5
16.4
17.0
16.9
17.5
17.4
18.0
17.9
18.5
18.4
19.0
18.9
19.5
19.5
20.0
20.0
Table 6-1
EFDATA Corporation
Code Rate 3/4
Eb/N0
S/N
Eb/N0
1.8
1.8
2.6
2.6
3.3
3.3
4.1
4.1
4.7
4.7
5.4
5.4
6.0
6.0
6.6
6.6
7.3
7.3
7.8
7.8
8.4
8.4
9.0
9.0
9.5
9.5
10.1
10.1
10.6
10.6
11.2
11.2
11.7
11.7
12.2
12.2
12.8
12.8
13.3
13.3
13.8
13.8
14.3
14.3
14.9
14.9
15.4
15.4
15.9
15.9
16.4
16.4
16.9
16.9
17.4
17.4
17.9
17.9
18.4
18.4
18.9
18.9
19.5
19.5
20.0
20.0
Maintenance
Code Rate 7/8
S/N
0.0
1.8
0.8
2.6
1.6
3.3
2.3
4.1
3.0
4.7
3.6
5.4
4.3
6.0
4.9
6.6
5.5
7.3
6.1
7.8
6.7
8.4
7.2
9.0
7.8
9.5
8.3
10.1
8.9
10.6
9.4
11.2
10.0
11.7
10.5
12.2
11.0
12.8
11.5
13.3
12.1
13.8
12.6
14.3
13.1
14.9
13.6
15.4
14.1
15.9
14.6
16.4
15.2
16.9
15.7
17.4
16.2
17.9
16.7
18.4
17.2
18.9
17.7
19.5
18.2
20.0
Eb/N0
-0.6
0.2
0.9
1.6
2.3
3.0
3.6
4.2
4.8
5.4
6.0
6.6
7.1
7.7
8.2
8.8
9.3
9.8
10.3
10.9
11.4
11.9
12.4
12.9
13.5
14.0
14.5
15.0
15.5
16.0
16.5
17.0
17.5
6-6–5
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