Help : Complex Signal .vs. Real Signal in Simulink ?

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waosai

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real signal vs complex signal

Hello everybody, I have some questions about signal type setting in simulink:

(1)“Real” and “complex”, which type should I use? What’s the difference between them?
(2)If I set the signal type to “complex”, whether I should add a “complex to magnitude-angle” module to see the output spectrum?

The detailed descripsion and figures are given in the attached word file.
 

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