Transcription of 3.6. Intersymbol Interference
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Example: stock market
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)n Intersymbol Interference Example 3-13 Intersymbol Interference Caused by RC Filtering Plot the output waveform when a channel filters a unipolar NRZ signal.
Example 3-13 Intersymbol Interference Caused by RC Filtering Plot the output waveform when a channel filters a unipolar NRZ signal. Assume that the overall filtering effect of the transmiIer, channel, and the receiver is that of an RC-low pass filter where the 3 dB bandwidth is 1 HZ. Assume that the unipolar NRZ input signal has a bit rate of R
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