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Time Varying AWGN Channel Model

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Aggieland

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Dear All
I have a problem.
I have a Simulink model for MIMO System which I add AWGN noise at the end.
I am looking for a "time varying AWGN Channel".
And I don't know how to model this to make it reasonable.
Basically we need to change the SNR of the channel butwe need this changes to be like the real changes that happen in the channel.
Does any body knows a model that I can implement?
I appreciate your help.
Regards;
 

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