SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
ACM
In Adaptive Coding and Modulation mode, the modulation parameters of the
Baseband frames can vary over time, according to the instantaneous receiving
conditions of the site where the frames will be received. In ACM a feedback
mechanism is used between the demodulator and the modulator. This feedback
mechanism dynamically tells the modulator which modulation parameters to use
for each Baseband frame. ACM allows operating satellite links with almost no
margin, since the system adapts automatically to fading or interference conditions.
Figure 62- ACM
Newtec’s implementation of ACM for applications is called FlexACM. It relies on a
unique very accurate linear and non-linear distortion measurement technology in
the demodulator (called NoDE) and advanced traffic shaping technologies in the
hub.
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