SHAPING THE FUTURE OF SATELLITE COMMUNICATIONS
Optimal ModCod Based on NoDE
The NoDE (Noise and Distortion Estimator) estimates the margin (in dB) for each
ModCod that it receives in multi-stream operation. NoDE also takes the distortion
(typically caused by a saturated transponder) into account. When the NoDE
function has been able to estimate the link margin, this link margin is used to
determine the optimal ModCod instead of the measured EsNo.
Figure 78 - Selecting a higher ModCod Based on Estimated Link Margin
A higher ModCod is selected if the estimated link margin, marked in Figure 78 by
the dotted lines is larger than:
The sum of:
• The higher ModCod threshold;
• The higher ModCod distortion;
• The higher ModCod target margin.
This sum is visualised at the right hand side in Figure 78.
Minus
• The current ModCod threshold;
• The current ModCod distortion
This is visualised in Figure 78.
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