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3.6. Intersymbol Interference

Intersymbol Interference Intersymbol Interference (ISI) occurs when a pulse spreads out in such a way that it interferes with adjacent at the sample instant. Example: assume polar NRZ line code. The channel outputs are shown as smeared (width Tb becomes 2Tb) pulses (Spreading due to bandlimited channel) Data 1 bT 0bT0bTbT Data 0 bT 0bT0bTbT Channel Input Pulse width Tb Channel Output Pulse width Tb Intersymbol Interference Intersymbol Interference He(t) win(t)= anh(t nTs)n wout(t)=an (t nTs)n *he(t)he(t)=h(t)*hT(t)*hC(t)*hR(t)He(f)= H(f)HT(f)HC(f)HR(f) H(f)= tTs =Tssin Tsf Tsf where wout(t)=anhe(t nTs)

A more general class of filter: Raised Cosine-Rolloff Filter H e (f)= 1,f<f 1 1/21+cos πf−f (1) 2f Δ ⎡ ⎣ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎧ ⎨ ⎪ ⎩⎪ ⎫ ⎬ ⎪ ⎭⎪,f 1 <f<B 0,f>B ⎧ ⎨ ⎪ ⎪ ⎪⎪ ⎩ ⎪ ⎪ ⎪ ⎪ Where B is the absolute bandwidth and the parameters f Δ =B−f 0 f 1 =f 0 −f and Δ f 0 is the 6-dB ...

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