how to observe modulated waveform?

[brunx]

Hello everyone..

Is it possible to observe a modulated signal in time domain?
I am using the command y=modulate(modem.psk(M),x) and I want to observe its waveform.

Thanks in advance.

 

[Communications_Engineer]

use scatterplot in Matlab

If every thing else is alright, you will see 4 constellation points.

I have a feeling you will only see 2 constellation points (both horizontal) though, since you might be making a mistake. Check it and tell me if I'm right

 

[brunx]

Yes, it shows the constellation points but what I mean is plotting the signal in time domain. Is there a way to plot it just like viewing it in the oscilloscope in real time?

 

[Communications_Engineer]

you mean observing the phase shifts? There is a file at mathworks.com for this. Search it

 

[brunx]

Thank you sir.

Do you know some keywords for me to start with?

 

[Communications_Engineer]

look for digital modulation, it is a GUI as far as I remember. So look for a GUI on digital communication.

You can search for files by product and choose Communication Toolbox

 

[brunx]

Ok, i'll try it.
Thank you again for your help sir.