How about CRLB method? Example:Estimating DC in WGN with unknown variance A k出=g即{立∑取-4月 whxiong@uestc.edu.cn 3whxiong@uestc.edu.cn 3 How about CRLB method? p(x; A) = 1 (2¼A) N=2 exp ½ ¡ 1 2A ³Xx[n] ¡ A ´2 ¾ Example: Estimating DC in WGN with unknown variance A