接收端带通滤波器后 y(0)={x+m()发“ 发“0 n(t=n(t)cosat-n(tsin at y)Ja+nO) Icosa t-n()inmt发“1” n(t) coso t-n(t) sin o t发“022 接收端带通滤波器后    + = 发“ ” （ ） 发“” ( ) 0 ( ) 1 ( ) n t u t n t y t i n t n t t n t t c  c s  c ( ) = ( )cos − ( )sin    − + − = 发“ ” 发“” ( )cos ( )sin 0 [ ( )]cos ( )sin 1 ( ) n t t n t t a n t t n t t y t c c s c c c s c    