# Question

Suppose we use an AR (2) model to predict the next value of a random process based on observations of the two most recent samples. That is, we form

Ẏ [n + 1] = a1Y [n] + a2Y [n – 1]

(a) Derive an expression for the mean- square estimation error,

E [Ɛ2] = E [(Y n +1] –Ẏ [(n + 1]) 2]

(b) Find the values of the prediction coefficients, a1 and a2, that minimize the mean-square error.

Ẏ [n + 1] = a1Y [n] + a2Y [n – 1]

(a) Derive an expression for the mean- square estimation error,

E [Ɛ2] = E [(Y n +1] –Ẏ [(n + 1]) 2]

(b) Find the values of the prediction coefficients, a1 and a2, that minimize the mean-square error.

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