频移键控 Figure 5.6 Binary frequency shift keying Amplitude Bit rate:5 r=1 S=N B=(1+d)S+2Df 0 1 0 B=S(1+d)+2Df WAAMAA S(1+d) S(1+d) Time 1 signal i 1 signal i1 signal i 1 signali 1 signal i element element I elementI element element 0 0 15 Baud rate:5 2Df 如果两个频率的差是2△f,那么BFSK要求的带宽是 B (1+d)×S+2△f 5.12 5.12 Figure 5.6 Binary frequency shift keying 频移键控 如果两个频率的差是2f ,那么BFSK要求的带宽是 B d S f      (1 ) 2