Editing Intersymbol interference (section)

== Countering ISI ==
[[File:Raised-cosine-ISI.svg|thumb|right|Consecutive raised-cosine impulses, demonstrating zero-ISI property]]
There are several techniques in [[telecommunications]] and data storage that try to work around the problem of intersymbol interference.

* Design systems such that the impulse response is short enough that very little energy from one symbol smears into the next symbol.
* Separate symbols in time with [[guard period]]s.
* Apply an [[Equalizer (communications)|equalizer]] at the receiver, that, broadly speaking, attempts to undo the effect of the channel by applying an inverse filter.
* Apply a [[Maximum likelihood sequence estimation|sequence detector]] at the receiver, that attempts to estimate the sequence of transmitted symbols using the [[Viterbi algorithm]].