How to plot frequency spectrum of QPSK signal?

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Oai Vu 2020-7-9

I'm trying to plot the frequency spectrum of a QPSK signal

binary_data = qammod(binary_data,4).*exp(1i*-pi/2);

Here, binary_data is my QPSK signal after I've used the 'quammod' function.

As you know, my binary_data consists of complex numbers. So how to plot its spectrum?

I used to plotting the signal which consists of real elements, not complex ones.

Wireless Communications Communications Toolbox PHY Components Modulation QPSK

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