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Well,
(1)
These are not steps, these are auxiliary variables for the formula.
I am doing it so, because it was writen in the book so. Of coures you can do it in one step.
Maybe the book uses this auxiliary variable because it would be too long formula to write it in one or two line.
2)
Well...
This can be the answer for your question.
This is a matlab code.
create a QAMSER.m file
copy this into the file
open and run it in matlab.
You can change m (the modulation number), so you can calculate SER for any QAM channel with rayleigh fading.
(by the way, it gives back the same result as...
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