Comtech EF Data CDM-700 User Manual
Page 253
CDM-700 High Speed Satellite Modem
Revision 5
Eb/No Measurement
MN/CDM700.IOM
CDM-700 Co+No/No to C/N (Es/No) and Eb/No (dB)
Code
Rate
QPSK
8-PSK
16-QAM 64-QAM
3/4 7/8 3/4 7/8 3/4 7/8 3/4 7/8
(Co+No)/No C/N = Es/No
E
b
/N
0
E
b
/N
0
E
b
/N
0
E
b
/N
0
E
b
/N
0
E
b
/N
0
E
b
/N
0
E
b
/N
0
4.5 2.6
0.9
0.3
-0.8
-1.5
-2.1
-2.7
-3.8
-4.5
5.0 3.3
1.7
1.1
-0.1
-0.7
-1.3
-2.0
-3.1
-3.7
5.5 4.1
2.4
1.8
0.6
0.0
-0.6
-1.2
-2.4
-3.0
6.0 4.7
3.1
2.4
1.3
0.7
0.1
-0.6
-1.7
-2.3
6.5 5.4
3.7
3.1
2.0
1.3
0.7
0.1
-1.0
-1.7
7.0 6.0
4.4
3.7
2.6
2.0
1.4
0.7
-0.4
-1.0
7.5 6.6
5.0
4.4
3.2
2.6
2.0
1.3
0.2
-0.4
8.0 7.3
5.6
5.0
3.8
3.2
2.6
1.9
0.8
0.2
8.5 7.8
6.2
5.5
4.4
3.8
3.2
2.5
1.4
0.8
9.0 8.4
6.8
6.1
5.0
4.4
3.8
3.1
2.0
1.3
9.5 9.0
7.3
6.7
5.6
4.9
4.3
3.7
2.6
1.9
10.0 9.5 7.9
7.2 6.1
5.5
4.9
4.2
3.1
2.5
10.5 10.1 8.4 7.8 6.7 6.0
5.4
4.8
3.7
3.0
11.0 10.6 9.0 8.3 7.2 6.6
6.0
5.3
4.2
3.6
11.5 11.2 9.5 8.9 7.8 7.1 6.5
5.9
4.8
4.1
12.0 11.7
10.1
9.4 8.3 7.7 7.1
6.4
5.3
4.6
12.5 12.2
10.6
10.0 8.8 8.2 7.6 6.9
5.8
5.2
13.0 12.8
11.1
10.5 9.4 8.7 8.1 7.5
6.4
5.7
13.5 13.3
11.6
11.0 9.9 9.2 8.6 8.0 6.9
6.2
14.0 13.8
12.2
11.5
10.4 9.8 9.2 8.5 7.4
6.8
14.5 14.3
12.7
12.0
10.9 10.3 9.7 9.0 7.9
7.3
15.0 14.9
13.2
12.6
11.4 10.8 10.2 9.6 8.4
7.8
15.5 15.4
13.7
13.1
12.0 11.3 10.7 10.1 9.0
8.3
16.0 15.9
14.2
13.6
12.5 11.8 11.2 10.6 9.5
8.8
16.5 16.4
14.7
14.1
13.0 12.3 11.7 11.1 10.0
9.3
17.0 16.9
15.3
14.6
13.5 12.9 12.2 11.6 10.5
9.8
17.5 17.4
15.8
15.1
14.0 13.4 12.8 12.1 11.0
10.4
18.0 17.9
16.3
15.6
14.5 13.9 13.3 12.6 11.5 10.9
18.5 18.4
16.8
16.1
15.0 14.4 13.8 13.1 12.0 11.4
19.0 18.9
17.3
16.6
15.5 14.9 14.3 13.6 12.5 11.9
19.5 19.5
17.8
17.2
16.0
15.4 14.8 14.1 13.0 12.4
20.0 20.0
18.3
17.7
16.5
15.9 15.3 14.6 13.5 12.9
20.5 20.5
18.8
18.2
17.0
16.4 15.8 15.2 14.0 13.4
21.0 21.0
19.3
18.7
17.6
16.9 16.3 15.7 14.5 13.9
21.5 21.5
19.8
19.2
18.1
17.4 16.8 16.2 15.0 14.4
22.0 22.0
20.3
19.7
18.6
17.9 17.3 16.7 15.5 14.9
Note:
1. Includes 2.5% Data Rate overhead (+0.107 db). Rate 7/8 is 20/23 actual (+0.03 dB).
2. Shaded are high error rate or unusable.
F–3