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why my constellation diagram is linear for QPSK?

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mohamis288

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here is my constellation diagram:

Screenshot (615).png


my schematic for this simulation is like this :

1685220322961.png


bit rate: 1MHz

setting:
sample rate = 100MHz
number of sample = 819101
simulation time = 819.1u

LPF filter settings is like this:
Screenshot (616).png


It is not necessary to give recommendation about systemVue software. even if you can give me some general idea about this, it would be great.

thank you
 

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