§4.1数字调制的基本原理 二进制已调信号波形 2ASK SAsK(t)=Eang(t-nTs)cos(aet+) 2FSK sK()=∑ag(t-nr)kos(ot+q)+∑ang(- nTs ) cos(@2t+o) 2PSK SPsK( =Eang(t-nTscos(oet+)+Eang(t-nTs )cos(aet+(+)an 1 0 1 1 0 1 0 0 2ASK 2FSK 2PSK (t) = a g(t − nT ) ( t + )+ a g(t − nT ) (c t +  + ) n c n s n sPSK n s cos cos (t) = a g(t − nT ) cos(ct + ) n sASK n s (t) = a g(t − nT )cos( t + )+a g(t − nT )cos(2t + ) n 1 n s n sFSK n s §4.1 数字调制的基本原理 二进制已调信号波形