(a) Determine the condition of the data window function w(t), for an unbiased spectral estimate of a white noise process,  with variance     where W(f) is the Fourier transform of w(t). (b) If we also...

(a) Determine the condition of the data window function w(t), for an unbiased spectral estimate of a white noise process,
 with variance

where W(f) is the Fourier transform of w(t).

(b) If we also consider the variance, how is the “best” spectrum estimate (lowest variance) for a white noise process achieved?