Re: SNR penalty due to Linear Interpolation

On Mar 18, 5:19=A0pm, "cpshah99" <cpsha...@xxxxxxxxxxxxxx> wrote:

Hi Jerry

I think what I have done is correct. I am resampling the carrier
modulate=
d
signal. So this carrier phase and timing impairements.

And the good thing is that at RX, using adaptive linear iterpolator,
it
locks to the value of velocity but at higher SNR.

I am thinking I need to do detail study of this topic.

Thanks

Chintan

If you use a loop filter, the bandwidth of this filter has to be
sufficiently
high to handle the Doppler. And that means that the filter admits
more
noise. This is covered in Myer/Moeneclaey/Fechtel, page 97 ....

I've never tried this, but it should be possible to keep the bandwidth of
the loop filter narrow. Radar systems use Kalman and related techniques to
track the ebb and flow of target doppler, as the target manoeuvres. It
should be possible to use such an approach to make the loop adjust in a
focused manner, rather than just widening the loop, and letting it move
around in a rather unfocused manner. Of course, if your target tracking
algorithm gets fooled by tricky manoeuvres, you might regret trying this.
Watch out for targets doing inverted half loops, and reversing their
Doppler shift in a few seconds. :-\

Regards,
Steve

.

Relevant Pages

  • Re: SNR penalty due to Linear Interpolation
    ...  And that means that the filter admits ... the loop filter narrow. ... track the ebb and flow of target doppler, ...
    (comp.dsp)
  • Knapsack Problem
    ... try to make the target up from and it then calls the recursive SUM function ... Now as well as nest and N we also need the CurrentSum, ... The logic in each loop is to first test to see if adding the next selected ...
    (microsoft.public.excel.programming)
  • Re: Shimmed Mounts and Extension Tubes
    ... It's closed loop control from the PD AF ... Use a 50mm f/1.4, a target at arms length and one larger one, ... The AF marker blinks in red --- focus distance aquired. ... While you switch to the distant target, the lens moves to the ...
    (rec.photo.digital.slr-systems)
  • Re: programmiclly adding records hits db size limit
    ... Set rstTargetTbl1 = CurrentDb.OpenRecordset ... LOOP through all addtional fields in source table insert into target ... HTH - RuralGuy acXP WinXP Pro ...
    (microsoft.public.access.modulesdaovba)
  • Re: Compare Records & Move to new table in VBA
    ... Loop through the first source table. ... AddNew on the target table if it matches. ... Create a query, using 2 copies of the table. ...
    (microsoft.public.access.modulesdaovba)