Newtec M6100 - 12.9 Equalink

Newtec Proprietary
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Features Descriptions M6100 Broadcast Satellite Modulator
12.9 Equalink™
Equalink™ is introduced to optimize the satellite link performance by counteracting distortion effects
in a satellite link.
The following distortions can be present:
Linear distortion
Linear distortions are typically compensated by the demodulator equalizer on most
modern demodulators.
Older demodulators with less good equalizer specs can suffer from linear distortion.
Therefor linear Equalink is only used to optimize a broadcast network with old
demodulators..
• Imperfections of the amplitude response of the transponder;
• Degradation caused by the phase response of the IMUX/OMUX filters lead to imperfections in
the group delay response.
Non Linear distortion
• AM/AM (output amplitude versus input amplitude);
• AM/PM (output phase versus input amplitude);
• Caused by the non-linearity in the amplifier of the satellite.
BER performance degradation due to transmission channel impairments is becoming increasingly
important in DVB-S2 systems operating with higher order modulation formats (16APSK, 32APSK), in
particular at higher symbol rates.
The Equalink™ concept effectively optimizes satellite link performance by counteracting these
distortion effects.