5.2 Pulse amplitude modulation 5.2.1.PAM:geometric representation Snm(t)=An8r(t)） 1)Basis function:()=kog() +A where=VVEe,Eg=∫g -A 2PAM The space is of 1-d and N=1. Antipodal A=1 2)The signal vectors (points):s=(a) 应广向 where,,a.=snΨ，-∫Ag,)0d E =AEs UESTC-Digital transmission through the AWGN channel Prof李晓峰 8