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QPSK Spectrum in Simulink

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Sordido

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Hi everyone.

I just want to plot the QPSK baseband spectrum from the output data of the QPSK simulink block.
However the output of this block are the symbol coordenates in the signal space and when I use "spectrum scope" i don't get the theorical spectrum for the qpsk (the sinc function..).

How can I do it? Can I use the qpsk block?

thanks in advance!
 

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