complex envelope in simulink

2019 9 6
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更新时间：2019 9 8
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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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Dimitris Kalogiros
编辑：Dimitris Kalogiros 2019-9-6

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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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C Langton
C Langton 2019-9-8

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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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