Inverse discrete Fourier transform
ifft(x) is the inverse
discrete Fourier transform (DFT) of the Galois vector
x is in the Galois field GF(2m),
the length of
x must be 2m-1.
For an example using
ifft, see the reference
The Galois field over which this function works must have 256
or fewer elements. In other words,
x must be in
the Galois field GF(2m), where m is an
integer between 1 and 8.