Channel Time Dispersion(time domain) With reference to the signals complex envelope: lu(t):input v(t):output 0-=2A6-ea- Because of the multipath and different propagation delays,the radio channel is affected by time dispersion at the Rx. In digital communication systems,symbols may overlap at the receiver, thus producing the so called intersymbol interference-ISI(avoided only ifTs>△t-t.max-t1min） With reference to the signals complex envelope:  Because of the multipath and different propagation delays, the radio channel is affected by time dispersion at the Rx.  In digital communication systems, symbols may overlap at the receiver, thus producing the so called intersymbol interference - ISI (avoided only if TS>>Δt=ti,max-ti,min) t |u(t)| : input |v(t)| : output TS Channel Time Dispersion (time domain) ( ) ( ) ( ) ∑ = θ − π ⋅ = ρ ⋅ − ⋅ r i 0 i N i 1 j 2 f t i i v t u t t e