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Appendix - Overview of the Used Technologies
In a linear environment, as described in , the Link Margin Estimates (LME) provided with or without
NoDE is identical. They correspond with the difference between the channels Es/No and the
(Es/No)QEF of the corresponding MODCOD, which is the real operation margin of the transmission.
When non-linear distortion is present, the real link margin is decreased and is no longer equal to the
difference between the measured Es/No value and (Es/No)QEF. NoDE calculates the amount of
distortion present on the received signal, then corrects the minimum Es/No value to obtain quasi
error-free transmission by a delta Δ that takes into account the effect of the distortion. In a non-linear
environment, as described in , NoDE enables the measurement of an accurate Link Margin
Estimation.
By providing the operator with an accurate estimation of the Real Link Margin, NoDE prevents the
link being operated in a region where the performance is unpredictable and only marginally stable.
By observing the evolution of (Es/No)QEF + ∆ functioning in a variation of the uplink power, NoDE
can also help the operator to find the optimal operational point of the transponder without
interrupting the transmission.
To get an overview of the statistics and the "calculation" of the link margin navigate to the following:
MDM6000 >> Demodulator >> ModCod Statistics
The parameters Link Margin and C/ND provide information on the current link quality for a certain
ModCod. FlexACM makes use of these statistics to define whether a new MODCOD must be
selected.
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