Example 10.1 Constant number plus zero mean noise are yi=u+n, i=1,.,m The estimate can be defined by 空小点m m i=1 A direct estimation way (moment based method) 62=2(0y- 1ni1 i=1 UESTC 55 UESTC Example 10.1 Constant number plus zero mean noise are , 1,...., i i y n i m = + =  The estimate can be defined by 1 1 ˆ m i i y m  = =  A direct estimation way (moment based method): 1 1 ˆ m i i y m  = =  ( ) 2 2 1 1 ˆ ˆ m i i y m   = = −  ( ) ( ) 2 2 1 ; , exp 2 2 i i y p y           − = −     