Assume the information data sequence be X(), k=0, I. N-1, then the transmitted signal s(t) can be expressed as )=∑X(D)p(27) =∑X(plep(12m△)0≤1<7,0≤p≤N and T OFDM Symbol period △f The received signal r(t) is ()=s()*()+() h(t: Channel response; w(O:AWGN signalAssume the information data sequence be X(k), k=0,1…N-1, then the transmitted signal s(t) can be expressed as ( ) ( ) ( ) ( )exp( 2 ), 0 ; 0 1. exp 2 1 0 1 0 =      − =   − = − = X p j p f t t T p N s t X p j f t N p p N p   f T  = 1 and The received signal r(t) is r(t) = s(t)*h(t)+w(t) h(t):Channel response; w(t):AWGN signal OFDM symbol period