M-ary PAM Use M signal levels, Ay. A Each level can be used to represent Log2(M)bits °Eg,M=4=A1=3,A2=-1,A3=1A4=3 s()=A1g(t) Mapping of bits to signals si b1b2 SSs 011M-ary PAM • Use M signal levels, A1…AM – Each level can be used to represent Log2(M) bits • E.g., M = 4 => A1 = -3, A2 = -1, A3 = 1, A4 = 3 – Si(t) = Ai g(t) • Mapping of bits to signals Si b1b2 S1 00 S2 01 S3 11 S4 10 Eytan Modiano Slide 4