complex envelope in simulink

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C Langton
C Langton on 6 Sep 2019
Answered: C Langton on 8 Sep 2019
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

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:

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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