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5G system-level simulation showing unwanted signal in spectram analyzer

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File attached.
I'm using Matlab's 5G toolbox to do a system level simulation (with the attached code). The code runs fine. To generate traffic, I am using OnOffTraffic generator function. I am producing only downlink traffic (gNB to UE).
As I understand, the system level simulation does not transmit SSB (signaling). Only data is being transmitted. But if I plot a spectrogram of the received samples (from signal analyzer app), I am seeing power at certain intervals (has pattern). These are surely not data traffic as I have confirmed by varying data rates and on-off timing.
Can anyone give me any idea on what these narrow signals are ? How are they even there ? Or how to know where they are generated from ?
Thank you,
Sam
  1 Comment
Saurav
Saurav on 7 Oct 2024 at 11:15
Can you provide the snapshot of what you are getting in the Signal analyzer app, and what exactly are you plotting?would be helpful in debugging.

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