How about minimizing the square error? J=>(x(n]-s[nl)2 Mean square error(MSE) m Example:Estimating DC in white noise xln A+wln] J(A)=(xn)-A)2 Minimize J(A)w.r.t A oA-区-网-u→i-∑m Q:Is this estimator MVU? whxiong@uestc.edu.cnwhxiong@uestc.edu.cn 7 J = Mean square error (MSE) X n (x[n] ¡ s[n]) 2 How about minimizing the square error? Minimize J(A) w.r.t A Example: Estimating DC in white noise x[n] = A + w[n] J(A) = X n (x[n]) ¡ A) 2 @J(A) @A = 2 hXx[n] ¡ NA i = 0 A b = 1 N X n x(n) Q: Is this estimator MVU?