8 Communication systems (1)Implementation y(t=x(te' x(t)cos@t+jx(t)sin @t cos(ωt+6c RRe y(t)I 9m{y(t)} sin(oct+8c)8 Communication systems x t t j x t t y t x t e c c j t c    ( ) cos ( )sin ( ) ( ) = + = (1) Implementation