Comtech EF Data SDM-650B - Manual (Page 138)

Theory of Operation SDM-650B Satellite Modem
5–14 Rev. 6
10 -4
10
-3
10
-5
10 -6
BER
10
-7
10 -9
10
-8
10
-10
3.0 4.0 5.0 6.0
E
b
/N
0
(dB)
7.0 8.0 9.0 10.0 11.0
10 -2
56 kbit/s
THEORETICAL
1544 kbit/s
Figure 5-5. Sequential Decoder BER Performance Curves (3/4 Rate)