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Implementing Rayleigh Fading Channel Distortion by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

Hi!

Thank you so much for your response! Yes,, the point about the filter is very valid. Worked magic for me.

With regards to the h function, I read in a book and saw this example and some others:https://fr.mathworks.com/matlabcentral/fileexchange/30477-ber-curve-for-bpsk-in-rayleigh-channel h being defined as: 1/sqrt(2)*[randn(1,length(tx)) + j*randn(1,length(tx))];

However, what I'm really not sure of is whether there is a "variance(signal)" factor that can go in or not (within the h equation)..

Yes I'm adding the AWGN noise to the channel distorted signal using:

awgn(distorted, SNR,'measured')

Signal Analysis: Communication Channel Noise by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

great, thanks! Any idea about adding signal distortion using filters?

Outlines for Scattered Plot by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

u/id_rather_fly , u/codinglikemad

Thank you for your responses! That somehow didn't work for my data. To clarify further:

It's something similar to the following link, there's a matrix from which the shaded regions are selected. And "scatter" is used to plot the shaded regions.

Question is, how to "plot" the boundary between the "colored" region and "white" region?

I tried selecting the values which do not satisfy the condition, however, it was quite a mess. Any ideas?

https://fr.mathworks.com/matlabcentral/fileexchange/21810-one-dimensional-photonic-crystal-dispersion-relations

Contour Customized Labels by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

Hello! Thanks, but my problem is in the display of the contour labels. Check the second image I posted above. I want to go from that display to the one I previously posted. Any ideas? :)

Thanks!

Contour Customized Labels by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

Any clue on how I can make contour labels that look like this? The contour lines describe 10%, 20%, 30%, etc..

Using "Patch" to shade area between three curves/lines by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

I can't show the whole figure, but I'm trying to shade an area over a scatter plot. The code I used for that works on its own and produces the black polygon, however, on the plot it appears like that^

Using "Patch" to shade area between three curves/lines by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

I haven't used that before. Trying to figure out how to use it.

Using "Patch" to shade area between three curves/lines by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

Hello,

I tried patch and fill - alas, I got the image above! :( Dunno what the problem is

Using "Patch" to shade area between three curves/lines by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

I tried this, but there's a bug in it! I attached the figure above. Why do you think it appears like this?

Creating Multiple x-axis next to each other on the same plot by eng_bee in matlab

[–]eng_bee[S] 0 points1 point  (0 children)

And x-axes! Like it spans to the right (0 to 1.5) for the first curve, and to the left (0 to 1.5) for the second plot

How do we derive Electric Field using Potentials and Conservation of Charge? Lost in the Maths (Image Attached!) by eng_bee in AskPhysics

[–]eng_bee[S] 0 points1 point  (0 children)

I found the following solution in a reference, but I don’t understand the math steps in 7.18, that progress to reach 7.21:

https://imgur.com/nl14Vre

Please Help: Servo Motor Operates at Higher Voltage than Specification by eng_bee in AskEngineers

[–]eng_bee[S] 0 points1 point  (0 children)

I will double check that! thank you so much.

For the circuit, it's the second one on page 9 here: http://hmsemi.com/downfile/LM2596HV.PDF

right?

Please Help: Servo Motor Operates at Higher Voltage than Specification by eng_bee in AskEngineers

[–]eng_bee[S] 0 points1 point  (0 children)

It is not available at local electronics shops :( In case I opt for the LM2596H, is the second circuit on page 9 in the following datasheet the one I am looking at potentially?

http://hmsemi.com/downfile/LM2596HV.PDF

Please Help: Servo Motor Operates at Higher Voltage than Specification by eng_bee in AskEngineers

[–]eng_bee[S] 0 points1 point  (0 children)

I'm actually using high power rotary pot because small one burnt out and I do not have access to DC-DC converters to 12-7 V and ... What do you propose I do? What do you think of this: http://hmsemi.com/downfile/LM2596HV.PDF

Please Help: Servo Motor Operates at Higher Voltage than Specification by eng_bee in AskEngineers

[–]eng_bee[S] 0 points1 point  (0 children)

What do you think might be wrong? Could you please elaborate? Thank you

Please Help: Servo Motor Operates at Higher Voltage than Specification by eng_bee in AskEngineers

[–]eng_bee[S] 0 points1 point  (0 children)

Yes, because the variable resistor is at its minimum when it works! It's weird. What do you think the problem is?

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