5.2 Pulse amplitude modulation sm)=An8r(t)cos2πf6t 5.2.1.PAM:geometric representation BPSK 1)Basis function:()=g() oox。M一W州 where。=/√Eg,Eg=∫g)d=the energ "11 “2 MASK 00 2PAM The space is of 1-d and N=1. Antipodal √E 2PAM Unipolar M 4PAM -3E-间 E 3/1 UESTC-Digital transmission through the AWGN channel Prof李晓峰 16