What is the inter-symbol interference (ISI)? Does it affect the transmission rate of a digital channel? Explain clearly.

What will be an ideal response?


Inter-symbol interference (ISI) is caused by time delayed multipath signal,

where in the second multipath signal is delayed such that it is received during the next symbol. Therefore, the received signals tend to get elongated and smeared into each other. Thus, ISI is caused by time delayed multipath signals.



The time for which second multipath signal is delayed is delay spread Td. In

time-dispersive medium, transmission rate R for digital transmission is limited by this delay spread Td. Therefore, for a low-error-rate performance,



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