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Re: ARMA process
Hehe, Finally I found the book !
So yes, ARMA processes can be understood as Linear-Time Invariant-Finite Impulse Response processes.
Very complete book by the way, but something I don't like in Haykins is that he sometimes change the notation w/o references or notices...
Re: peaks detection
Thank you for your advices, the becuase trouble comes from the threshold or the hystersis setting, which I want to be autoadjusted, and actually there is a lot of divergence from sample to sample and some min are higher than other max even after high passing.
And...
Sorry for the poor writing. :!:
Yes your are right but by point is : if the system have been fed by gaussian pulse so we can write in frequency domain Y=G*X with G the transfer function of the system and X the gaussian pulse's Fourier transform and X=H*I with H the dirac-to-gaussian transfer...
Imagine you have a signal like in the attachement (sorry, made with paint), noisy with not regular peaks and peak height at different levels. What you need is counting the peaks without missing them.
I most simple I thought was a low pass (smoothing) + discrimation (difference) + threshold +...
Does somebody know practically how do we define an ARMA process, are LTI ARMA process?
What I want to do is identify the coefficient of the equivalent electrical circuit from the S-parameter.
Is the Prony method appropriate in this case?
Lack of details, sorry, but if you can just give me...
I have a measured truncated spectrum and I want to know the corresponding impulse response. How should I do?
I padded the data with zeros and created the complex symmetric spectrum from these data to have a real signal when applying the ifft.
But. Results is not at all what I had expected. I...
Iam not an expert but I would say it rely only on the D/A converter.
Btw, the idea of Ankit is not bad. Or what about a Pulse Width Modulation, as it doesnt need a D/A.
Re: s-parameter from fdtd
Fairly easy :
with oAB being the FDTD reponse at the port A to the extication coming from B.
S11=FFT(o11,N)./FFT(i1,N);
S21=FFT(o21,N)./FFT(i1,N);
..
S34=FFT(o34,N)./FFT(i4,N);
and so on.
choose N with respect to the frequency resolution you want and the time...
"Laguerre expansion, Hilbert's space, Matrix pencil, auto-regression, etc" does somebody know a good reference explaining the mathematics to understand how to use these concepts in the field of interpolation and denoizing? Iam aquainted with signal processing mostly frequency domain filtering...
well, I dont have your data but if your structure is something like Metal-SiO2-Si this behavior should be correct. There is some old work about this, check slow wave mode in google.
By the way, how did you do your simulation, which software/method?
A question on how to derive S-parameter for time domain.
S11 and S12 is easy, take the FFT of the reflected and transmitted signal and normalize by the input.
Now,
S22 and S21 are derived form that but I dont know in which fashion, S22 for example looks like S11 with a 180 phase shift but not...
Thank you for the equation, I totally agree with you and that why I do not understand the behaviour of the simulations...
For the S parameter to be wrong there must be an error in the time domain propagation, but I cannot see which one, I tested mesh, ports, boundaries, material, etc..
I suspect...
I calculated the S-parameters in MicrowaveStudio, not measured them.
In FDTD, you take the FFT of the time domain responses and divide them, so S11= FFT(reflected output o11) ./ FFT(input i1).
I put two plot, one from taken from Murata for a similar inductor
the other from my calc.
If you can...
Hi everybody,
A question quite simple :
When I model an inductor with MWS, I get a phase angle of about 180 or -180, somethimes 0 deg.
I always thought that an inductor induces a lag of 90deg. ( little less for real inductor with R and C) why isnt it the case in the simulation ?
David
small...
Re: Lumped element model : Equivalent circuit
Thank you for answers but i am not sure about the first step which is the determine the parameters of the (passive) circuit before simulating it.
I still dont know :
1. I have my impedance Z11 or my S11 data (complex), first I a do a polynomial...
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