hesela.devIntersymbol interference
Intersymbol interference occurs when a channel's response to one symbol contributes to observations used to detect other symbols.
In magnetic readback, closer recorded transitions can produce overlapping responses. A partial-response channel deliberately retains a modeled form of overlap and detects sequences jointly; equalization need not remove every neighboring-symbol contribution [1].
ISI is not itself random noise or an error count. Its effect depends on the response, symbol spacing, synchronization and detector assumptions. It also differs from interference between adjacent tracks: the relevant neighbors here are symbols along a signal sequence.
Relations
- related
- Partial-response target, PRML detection, Noise-predictive maximum-likelihood detection, Adjacent-track interference (ATI)