1)大信噪比情况A+m(t)>n1(t) E()=[A+m(0)3+2A+m(0)y()+n2(0)+n( ≈√A+m(O)2+2[A+m()(t) [A+m(t)[1+ 2n2(t)1 A+ m(t) s[A+m()1+h(t) A+ m(t) A+m(t)+n(t) 有用3 1）大信噪比情况 A m(t) n (t)   i ( ) [ ( )] 2[ ( )] ( ) ( ) ( ) 2 2 2 E t A m t A m t n t n t n t     c  c  s [ ( )] 2[ ( )] ( ) 2 A m t A m t n t     c 2 1 ] ( ) 2 ( ) [ ( )][ 1 A m t n t A m t c     ] ( ) ( ) [ ( )][ 1 A m t n t A m t c     A m (t) n (t)    c 有用