T 4(xw)+1(/ P()=-S 4 (2)双极性波形 g(t)=-g2(t)=g(t P p,(O)=TS(x7,) 般地如果=1()=k(与关) g2(t) 且0<k<1 则g1(t)及g2(t)组成的脉冲序列将无 离散谱 88 (2) 双极性波形 ( ) 4 1 ( ) 4 ( ) 2 Sa fT f T p s s s  =  +  ( ) ( ) ( ) 1 2 g t = −g t = g t 2 1 P = ( ) ( ) 2 s s s p  = T Sa fT 一般地,如果 (与t无关) 且 0 ≤ k ≤ 1 则 g1 (t) 及 g2 (t) 组成的脉冲序列将无 离散谱. k g t g t p = − = ( ) ( ) 1 1 2 1