TM 11-5820-803-12
Figure 2-4. PSK modem theoretical bit error rate performance for various coding configurations (best case performance).
maximum bit error rate, but the satellite will not support
d. However, should the digital user require a
5
any increase in the C/KT, then the following situation
minimum bit error rate of 1 x 10- instead of 1 x 10 ,
-3
exists. Operating with the same link parameters, the
operation with differential coding only would not provide
an acceptable bit error rate. In this case, using the
55 dB and a data rate of 100 kb/s,) is now 5 dB.
internal coder/decoder would result in an acceptable bit
Referring, to the performance curves of figure 2-4 the
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error rate of 4.4 x 10 as indicated in figure 2-4.
resulting error rates for the various options are:
e. Assuming that the digital user's data rate is
-2.
-5
(1) Differential coding only
1.2 x 10
changed to 100 kb/s, that he still requires 1 x 10
2-5
