Power spectral estimation based on ARMA model 5.(=)=s..()H()H()s.(=) Let z=eio X(2) he* H(a)= k=0 W(z) k=0Power spectral estimation based on ARMA model ( ) ( ) ( ) ( ) ( ) 2 * * 1 xx ww ww j S z S z H z H H z S z z Let z e ω   = =     = 0 0 ( ) ( ) ( ) q k k k p k k k b z X z H z W z a z − = − = = = ∑ ∑