x$[$n$]=$

$2$X k$=1$

Akcos$(2\backslash$pi fkn$)!+$ w$[$n$]$

For this model, the unknowns are Aks and we know fks$.$ We expect you to derive the EM$$algorithm for this problem.

$($a$)(5$ points$)$ Determine complete and incomplete data and the noise associated with it