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NorbertoBarroca1-Visitor
1-Visitor
January 29, 2011
Question

Half-Sin pulse shapping

  • January 29, 2011
  • 1 reply
  • 2187 views

I'm trying to implement an Half Sin Pulse shapping filter like the one shown bellow.

Filter.PNG

My input values are given by:

Input.PNG

My filter function is:

FilterO.PNG

However when I make the convolution between the input values and the filter the result is no the expected I alway have zero can someone help me?

res.PNG

Message was edited by: Norberto Barroca

1 reply

A
Anonymous
January 31, 2011

Hi Norberto

Would recommend change to definition of pulse for clarity, at 2TC 4TC etc output is defined by 2nd condition but mathematically it could be either 1 or -1.

The main problem however seems to be the way mathcad divides the period of the integral.

It is reaching a limit at which it cannot resolve the information & everything collapses to the 0 result that you get.

Not too useful in your case where you actually want to integrate between infinities.

Example sheet gives same output for I =100, 455 & 460 *Tc (3.1830988618x10^-7s) but 0s for the 461* Tc case.

It might be that for a different system (eg not mathcad 12 ...) it will run to different limits, I'll be interested to hear comments about this.

Note that I've tried changing TOL & CTOL values - does improve the accuracy of the result given but not the level at which it 'breaks' & gives a zero answer.

Regards

Andy

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