Generate a realization of stationary Gaussian noise with given 2-sided PSD Y = STATGAUSSNOISEGEN(N,PSD,fltrOrdr,Fs, noise_num, noisefile) Generates a realization Y of stationary gaussian noise with a target 2-sided power spectral density given by PSD. Fs is the sampling frequency of Y. PSD is an M-by-2 matrix containing frequencies and the corresponding PSD values in the first and second columns respectively. The frequencies must start from 0 and end at Fs/2. The order of the FIR filter to be usedis given by fltrOrdr. (Optional) noise_num = noise realization number from a pre-created noise realizations file (Optional) noisefile = pre-created noise realizations filename