5.2 Pulse amplitude modulation s(t)=Agr(t) 5.2.1.PAM:geometric representation 1)Basis function:()=kog() where。=/√Eg,E。=∫'ng()dthe energ 11 10 01 00 2PAM The space is of 1-d and N=1.. Antipodal 2)The signal vectors (points):s=(a) E 2PAM where,d(d Unipolar VE。 =AEs 4PAM A=1 E UESTC-Digital transmission through the AWGN channel Prof李晓峰 11