Constellation not visisble after DUC?
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I am trying to simulate a system in Simulink, where i am trying to generate a QPSK modulated waveform (As you can see in the image below)
I am getting a proper constellation after the Fiilter block (as you can see in the image below)
But after the DUC unit, i am getting something
The spectrum i am getting afetr both the stages are shown below
After Root Cosine
After DUC unit
In the image below, we can see the DUC block setting
Please help me to resolve this issue.
Regards
Amol
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Answers (1)
Navya Seelam
on 2 Apr 2020
Digital Up-Converter block converts a complex digital baseband signal to a real passband signal. Since the output of DUC block is real you are getting such constellation. You will get the expected QPSK contellation when you down convert the output of DUC.
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