6.1 ISI and zero-ISI condition C(f)=0,f≤B。 G,(f） C() G:(f) Det. {a} y() {a} g(0 n(t)月 gR()） Sym-timing Tx ChanneL Rx Observation: The 1st term on RHS provides the nth symbol an. =y(nT)=>ah(nT-kT)+v(nT) The 3rd term represents additive noise. The 2nd term provides no info on an,and is an …+am-2h(2T)+abE)tah明 harmful interference,called Inter-Symbol +ah(T)ah(-2T) ..+v(nT Interference (ISI) =anh(0)+IsI+v(mT） UESTC-Digital transmission thro BLAWGN channels Prof李晓峰 9