why my constellation diagram is linear for QPSK?

mohamis288

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here is my constellation diagram:



my schematic for this simulation is like this :



bit rate: 1MHz

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

LPF filter settings is like this:


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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