Power spectral estimation based on MA model s.()=s()u()h=u(es(e) Let z=elo ao 1 x(n)=∑b4w(n-k) u(e)0昌三A:Power spectral estimation based on MA 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 0 1 q k k q k k k a x n b w n k X z H z b z W z = − = = = − = = ∑ ∑