Intersymbol interference meaning

What do you mean by the term intersymbol interference?

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In telecommunication, the intersymbol interference (ISI) signifies a form of distortion of a signal which causes the prior transmitted symbols to encompass an effect on the presently received symbol. This is generally an unwanted phenomenon as the prior symbols have identical effect as noise, therefore making the communication less reliable. ISI is generally caused by echoes or non-linear frequency response the channel. The ways to fight against intersymbol interference comprise adaptive equalization or error correcting codes (particularly soft-decoding with Viterbi algorithm).

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