Comtech EF Data CDM-700 - Manual (Page 149)

CDM-700 High Speed Satellite Modem Revision 5
Summary of Specifications MN/CDM700.IOM
10–7
10.7 BER Performance
Note: For Turbo coding and modulation types, guaranteed (typical in parenthesis):
Requirement Information Only
Eb/No
3/4
Eb/No
7/8
3/4
Spectral
Efficiency
7/8
Spectral
Efficiency
Es/No =
C/N
3/4
Es/No =
C/N
7/8
QPSK 10-5
10-8
10-10
3.9 (3.4)
4.2 (3.7)
4.4 (3.9) 4.4 (3.9)
4.6 (4.1)
4.9 (4.4)
1.463415 1.696713
5.6 (5.1)
5.9 (5.4)
6,1 (5.6) 6.1 (5.6)
6.3 (5.8)
6.6 (6.1)
8-PSK 10-5
10-8
10-10
6.7 (6.2)
7.0 (6.5)
7.2 (6.7) 7.3 (6.8)
7.6 (7.1)
7.8 (7.3)
2.195122 2.545069
10.1 (9.6)
10.4 (9.9)
10.6 (10.1)
10.8 (10.2)
11.0 (10.5)
11.2 (10.7)
16-QAM 10-5
10-8
10-10
7.7 (7.2)
8.0 (7.5)
8.2 (7.7) 8.3 (7.8)
8.5 (8.0)
8.8 (8.3)
2.926829 3.393425
12.4 (11.9)
12.7 (12.2)
12.9 (12.4) 13.0 (12.5)
13.2 (12.7)
13.5 (13.0)
64-QAM 10-5
10-8
10-10
12.0 (11.5)
12.3 (11.8)
12.5 (12.0) 12.6 (12.1)
12.9 (12.4)
13.3 (12.8)
4.390244 5.090138
18.4 (17.1)
18.7 (18.2)
18.9 (18.6) 19.7 (17.7)
20.0 (18.0)
20.4 (18.4)
Notes:
1. 16-QAM 3/4, add 0.2 dB above 51 Mbps.
2. 16-QAM 3/4, add 0.4 dB above 103 Mbps.
3. 64-QAM 3/4 , operates to 32 Msps. 64-QAM 7/8, operates to 30.6 Msps.
Additional Information:
For comparison with DVB-S2 it is convenient to use Spectral Efficiency (bps/Hz) and Es/No
(Es/No = C/N in the symbol rate bandwidth). Es/No is given by:
Es/No = C/N = Eb/No + 10 Log (Spectral Efficiency).
10.7.1 Adjacent Channel
No more than 0.5 dB Eb/No degradation in the presence of a like modulated adjacent carrier
spaced 1.3 x symbol rate from the desired carrier and 10 dB higher than the desired.