6.1 ISI and zero-ISTii (t) G,(f） {a} gr(1) Tx The tails on both sides of h(7)out of the symbol interval cause the ISI. Observation: The 1st term on RHS provides the nth symbol an. n=y(nI）=∑ah(nI-kT)+v(nZ 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)ah2T) ..+v(nT Interference (ISI) =anh(0)+Isi+v(mT） UESTC-Digital transmission thro BLAWGN channels Prof李晓峰 10