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complex envelope in simulink

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I have a simple model of two sines. I was expecting a spectrum (in complex enevelope) of just two carriers at my given frequencies. But I am seeing a double sided spectrum. Is this how simulink works for all signals? I am trying to create a C/3Im model, not sure how to interpret with both sides present inthe spectrum. Any thought illuminating this issue will be helpful.
spectrum two carr.png
two carriers.png

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Accepted Answer

Dimitris Kalogiros
Dimitris Kalogiros on 6 Sep 2019
Edited: Dimitris Kalogiros on 6 Sep 2019
Sum of two sine signals is a real signal. So, its spectrum is symetrical around zero.
A block diagram that produces a "complex signal" is the following:
blockDiagram.png
Two sine waves with appropriate phase difference, in order to become a sine and a cosine
Their settings are shown at the following figure:

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More Answers (1)

C Langton
C Langton on 8 Sep 2019
Thank you. I realized that the sines blocks are real signals and not complex. I was expecting them to be complex.

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