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  • $\begingroup$ would you be willing to list out what each of the variables stands for? I'm rather new to this, so W, j, X(), N and k don't yet have definitions for me. $\endgroup$ Commented Jun 8, 2017 at 20:44
  • $\begingroup$ $W$ is already defined in my answer. I tried to better define some other notations. $k$ denotes index in the frequency domain and $n$ index in the time domain. $\endgroup$ Commented Jun 8, 2017 at 20:53