5.4.1 Orthogonal signal waveforms S=VE,Ψ，S,=VE,Ψ2，Sw=VEVu Passband examples A very common type is call FSK(Freq shift keying) The signals are given by, u()=Acos[2π(f+m×△f)] t∈[0，T],m=0,1,,M-1 Note that: 1. Afis the freq separation which is some value making the signals orthogonal. 2. With same amplitude the signals are all of equal energy. Take M=4 (4FSK)a 0 32 0 AAAWAAAA- UESTC-Digital transmission through the AWGN channel Prof李晓峰 7