6.1 ISI and zero-ISI condition C(f)=0,f≤B。 G(f) c(f) Gx(f) Det. a. y(t) {a} 8r() gx() Sym-timing Chanpel Rx Trans.Signal:s(1)>ag() Filtered sig: y(t)=r(t)*gx(1) agr(t-kT) =∑ag(-kT)*c()*g.)+n)*g() ∑ah(t-kT)+v() Received sig:r()=>ag(1-kT)*c(1) where,h(t)=g(t)*c()*gt)is the overall resp. k=00 +n(t) UESTC-Digital transmission thro BLAWGN channels Prof李晓峰 6