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I have found negative value of SNR(in dBc) of an ECG signal by using spectrum analyzer block in simulink.Is it correct?
That is normal. A negative dBc value simply means that the signal is weaker than the carrier. HTH

9年以上前 | 1

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Can I get Antenna Toolbox on trial basis?
<https://www.mathworks.com/products/antenna/> There is a product trial link on the right panel beside MATLAB logo. HTH

9年以上前 | 1

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Strange results with xcorr
You may want to get the lags from xcorr too so you can plot the correlation over lags. [C,lags] = xcorr(s1,s2); plot(la...

9年以上前 | 0

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Out of Memory error!
I'm a bit confused by your code snippet. For example, your input, signal, is never used in the function, so I'm not sure what yo...

9年以上前 | 0

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Help required with simulating Ultrasonic Transducers!
Most Phased Array System Toolbox functions today assumes plane wave. So if you are only doing flash mode, then it is applicable....

9年以上前 | 0

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Simulating a known signal at an array of antennas
I would suggest you looking at |phased.Collector| to collect signal and |phased.ReceiverPreamp| to add noise. Say you have a sig...

9年以上前 | 1

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Difference between steering and angle parameter!
The input 'Ang' specifies the direction at which the signal is transmitted. The input 'Steer' only applies when you have a su...

9年以上前 | 1

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coder.extrinsic error! Radar designing
coder.extrinsic should have no effect in regular MATLAB. It only applicable when you try to generate the code. But I'm not sure ...

9年以上前 | 1

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Is the size of antenna array correspond to the number on transmit antenna ???
I don't quite get your question. From your description "an antenna array of size 256x64 at transmitter", I'd say 256x64 is the a...

9年以上前 | 0

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Radar sector scanning!
The example uses the electronic scanning, i.e., scanning the beam via changing the phase at each element. Also for simple rotati...

9年以上前 | 0

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In order to generate vertical coverage plots or blake charts using radarvcp the frequency limit is 10 Ghz . I need to make plots at 16 Ghz. I can't determine what function is generating the error message about exceeding the 10 Ghz limit. Help?
I think the limit is set by the original model developed by Blake. I believe beyond 10 GHz the model is not validated. The error...

10年弱前 | 1

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Specifying SNR level of signal returned from Phased Array System Toolbox's function sensorsig
You can specify the signal power if you specify the SCOV input as a scalar. See the reference page at <http://www.mathworks.c...

10年弱前 | 0

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FMCW sweeptime Query!
I don't have your data to test it, but if you are using a 1ms sweeping time, then you need to update your sweep slope too. Inste...

10年弱前 | 2

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How to use spectrum analyzer object to show a signal waveform ?
You can set FrequencyResolutionMethod to 'Window length' to manually adjust the length of signal used to compute the spectrum, e...

10年弱前 | 0

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FMCW Radar Query!
Looks like you are using Phased Array System Toolbox, in that case, have you checked out its library in Simulink? There is a FMC...

10年弱前 | 0

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Question about sensorsig function of phased array system toolbox
If I understand it correctly, the signal at antenna #2 is essentially the negative of the antenna #1. This is because the first ...

10年弱前 | 1

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Phased Array Simulink modeling, Barrage
If you always outputing multiple number of pulses, then you may want to consider setting OutputFormat to Pulses and simply speci...

10年弱前 | 0

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phased.FreeSpace Error invoking stepImpl
Looks like your signal changed the complexity during your simulation. An easy way to fix this is to always convert your input to...

10年弱前 | 0

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How can i find the path of a file?
Try fileparts(which('File.sldd')) But your File.sldd has to be on path.

10年弱前 | 5

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Frequency domain of wvtool - how to replicate?
You need more points in there. The default is probably 512 or 1024. Try plot(db(abs(fft(w,1024))));axis([0 50 -80 40]); ...

10年弱前 | 0

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I have communication systems toolbox. I am not able to find FM Modulator baseband module in Simulink. Help
What version do you have? According the documentation below, you should be able to find it under Modulation library, then Analog...

10年弱前 | 0

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Different plots using rocpfa
I think you probably refer to the case where you take the magnitude of the signal to do the detection and in that case I agree w...

10年弱前 | 0

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Direction of arrival estimation of multiple signals using Capon (MVDR) beamformer
I would replace your signal definition with the following x = x + amp(k)*aU(k,:).'*exp(1i*randn(size(t))); HTH

10年弱前 | 0

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area of power spectrum units
If your horizontal axes is in Hz, then the unit will be fT^2/Hz*Hz=fT^2.

10年弱前 | 0

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How to excite each antenna with a different level of power by using phased array toolbox or antenna toolbox?
You can do this by passing in a weight vector to array. For example, say you have an 8-element array and you want to excite it e...

10年弱前 | 0

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A few questions about the output value of dsp.SpectrumAnalyzer
Here is how I look at it: (1) For all those FFT based spectrum analysis tool, the theory behind it is that the base of FFT ma...

10年弱前 | 0

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mex file gives two different results. what is the cause?
maybe you have some random number in functions you use? Could you try to run rng(0) before each run of your script and s...

10年弱前 | 0

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What toolboxes, if any, come with MatLab prerelease?
You may find the following answer useful <https://www.mathworks.com/matlabcentral/answers/101155-how-do-i-obtain-a-prerelease...

10年弱前 | 0

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Notice of amplitude modulation in FMCW example
This is due to the distortion of the propagation. In your setup, the distance between the radar and the target is approximately ...

10年弱前 | 0

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How to use the fast fourier transform to calculate the output of a transfer function?
I assume your X, H, and Y are all in frequency domain? In that case, your H has to match the size of X and it should be a elemen...

10年弱前 | 2

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