What do I look for in a post? Clarity and Contribution.

NO vote: If the post is clear, but makes no contribution OR if the post is unclear, but makes a contribution (though I will try to improve the clarity either by comments or direct edit).

UP vote: If the post is clear and makes a contribution.

DOWN vote: If the post is unclear and makes no contribution (though I will try to see if I've missed something by commenting).

1d
reviewed Close How does the OFDM system receiver decide the OFDM symbol length?
1d
reviewed Close What is meant by isotropic diffusion?
1d
reviewed Close Calculate the Lyaponuv spectra of an EGG time series
Apr
20
awarded Caucus
Apr
20
comment Basic “filtering” in digital communications
@DilipSarwate Done! As much as is possible.
Apr
18
revised What is meant by isotropic diffusion?
Reformatting and stating
Apr
17
awarded Constituent
Apr
16
comment Kalman filter - mathematical model for signal strength based tracking
Hint: The state of your model should be the information you really care about knowing. You might want to know the $(x,y)$ position of the sender. If that's true, then you're correct: you might end up with a nonlinear signal model (to get from $(x,y)$ to the signal strength), which implies you need an Extended KF. That your signal doesn't stay constant (has noise added) does not matter for KF vs EKF. The only thing that matters is whether the signal model is linear or non-linear.
Apr
15
revised Causal and minimum phase
deleted 1 character in body
Apr
15
comment Causal and minimum phase
@MattL. You are, as usual, correct. I meant to have the exponent as $p$ rather than "-p". Does that help?
Apr
15
comment Causal and minimum phase
Response to comment #2: Yes, a minimum phase filter cannot be symmetric (except for the boring case of $H(z) = h_0$, a constant). The characteristic of the impulse response is that it has no non-zero coefficients for negative time (the impulse response does not start before the putative impulse).
Apr
15
comment Causal and minimum phase
Response to comment #1: A causal FIR filter can have zeros outside the unit circle. It just won't be minimum phase. Yes, a minimum phase FIR filter will be, by definition, causal and stable but just because an FIR filter is causal and stable does not mean it is minimum phase. Does that reconcile it?
Apr
15
answered Causal and minimum phase
Apr
15
comment FIR difference equation vs convolution summation
Please select this as the right answer if you don't need any more info.
Apr
15
comment Is it possible to have negative PSNR?
OK, so I'm wondering if what is happening is that one (or several) pixels are going outside the range 0 to 255, causing a wrapping or clipping error? That would explain getting HUGE errors for smaller noise.
Apr
15
comment Is it possible to have negative PSNR?
Isn't that 255? Or are you using 16 bit pixels? 255^2 is the square of the largest pixel value...?
Apr
15
revised Wiener filter optimal coefficients and the input signal
MInor tidyup
Apr
15
comment Is it possible to have negative PSNR?
I'm not sure where you are getting the 255^2 from? Does that mean the video is $255 \times 255$ ? Yes, you're right, though, it is a little strange...
Apr
15
comment Is it possible to have negative PSNR?
Right! But that still means the PSNR can be negative, or do you have a different question now?
Apr
14
answered Where do I ask Wireless Communications Questions
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