Question about Fading Simulation

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Reni Septiana

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Hello.. I have read some multipath fading simulation codes. What makes me wonder is in all of them, fading is applied directly on mapped transmitted data (BPSK, QPSK, QAM, etc) without multiplying it with carrier signal.
In real world, fading is occured in analog signal, not digital (I'm sorry if I use the wrong term, I hope you know what I mean ). Isn't it?
Thanks in advance, and sorry for my bad english...
 

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