Chapter 8 Communication Systems Quadrature Multiplexing(正交多路复用) coso t cos o t X y LPF r()communication Channel LPF f sin o t sin o t y()=x() y2(=x2() 88 Chapter 8 Communication Systems Quadrature Multiplexing（正交多路复用） t c cos x (t) 1 t c sin x (t) 2 r(t) t c sin t c cos LPF LPF y (t) 1 y (t) 2  M  M Communication Channel r(t) w (t) 1 w (t) 2 y (t) x (t) 1 = 1 y (t) x (t) 2 = 2