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QPSK noise addition help simulink

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masab_ahmad

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Hi all,

I made a QPSK mod/demod in simulink which AWGN channel. The output is fine when it comes to seeing random bits. I also dont want to use inbuilt QPSK/AWGN blocks. But the noisy scatter plot doesnt come out to be ok. Can anyone help me on this? Also, please guide me on making a BER/SNR curve from this model(attached).

Thanks
 

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