4.1 We wish to estimate the amplitudes of exponentials in noise. The observed data are Σ zin] Ar+w[n] n=0,1,...,N-1 where w[n] is WGN with variance o². Find the MVU estimator of the amplitudes and also their covariance. Evaluate your results for the case when p = 2,r₁ = 1,2-1, and N is even.