Re: Correlation Estimator block threshold settings in Absolute/Dynamic mode

Thank you for your help, Nick, Christoph, and Achilleas!

@Christoph
> How close to 1 did you use thresholds for the relative threshold method?
> For the relative threshold method I use thresholds between 1-exp(-5)
> .. 1-exp(-8).

Even with 1-exp(-15) I get many false positive detections. And it
seems to get worse over time. The longer the flowgraph runs, the more
false positives are detected. I guess that somehow has to do with the
way that the threshold is updated in the relative mode? But that's
speculation..

@Nick
> The magnitude of the correlation depends on the magnitude of your signal. The AGC normalizes the signal amplitude before the correlator, so you see expected behavior. The correlation estimator block expects the input to have a normalized amplitude.
@Achilleas
> This means that if one wants to build a correlator that works with an arbitrary scaling "a" (suppose a genie gave you that at the Rx), the only thing you should have to do is to
> put as the parameter "threshold" in the block the quantity "a fraction".
> This would make the whole system transparent: no matter what the scaling is, your estimator would work exactly the same.
> HOWEVER, as it turns out the "correct" scaling that works for this block is to set "threshold= a^2 fraction".
> This is really weird and I do not see any intuition behind that type of scaling...

As genies are currently busy with forecasting the Covid-19 situation,
I'll stick with an AGC3 block prior to the Estimator. ;-)

Best regards
Fabian