5.4.1 Orthogonal signal waveforms Consider a space with orthonormal basis of{Ψ1，Ψ2，，Ψw},forM-ary transmission And,construct signal set s,s2,,s such that, s,=VE,业1，S,=VE,业，，sw=VEΨu They are,1)orthogonal,2)M-dimensional,3)having equal energies. For convenience of graphing,take M=3 in our discussion. The coordinates and constellations are, 2(04 s=(VE,0,0） dnm=小sm-snl s,=(0VE,0) 2e, =WEE s=(0,0,VE e, =√2E,=2ls p() UESTC-Digital transmission through the AWGN channel Prof李晓峰 4