On Oct 28, 11:25 pm, "Aymen " <aymenkoo...@gmail.com> wrote:

Since its stochastic, you can just use random phases.
The 2nd order statistical properties (standard deviation and variance)
will be preserved, no matter what the phases are.

But before hitting it with ifft, you need to compose a vector of
complex numbers.
The composition of this vector depends upon what you have already.
Does the frequency go from zero to the Nyquist, then negative?
Or are all the frequencies positive?
And is the first frequency zero?

Basically, if Y is a column vector of complex numbers prepared from
the amplitudes with the first frequency being greater than zero, then
your vector for ifft should look like this:
Y1=[0;Y;flipud(conj(Y))];
If there is a zero frequency, it will look like this:
Y1=[Y;flipud(conj(Y(2:end)))];