Automatic equalizer for digital magnetic recording systems

Cancellation of linear intersymbol interference for two-dimensional storage systems

“…The combination of a linear ISI canceller combined with an error reducing circuitry, called quantized logical equalizer (QLE), has been proposed in [12]. In [13], through a simulation study, the performance of the canceller was shown to lag well behind the Viterbi Detector and to provide little improvement over a DFE at high recording densities.…”

“…In this case the joint probability of and can be expressed as (16) • Case II: The same error event occurs in the tentative and the main detectors , and . Because the two conditions (12) and (11) must be satisfied, the joint probability can be expressed as (17) In general, and hence the probability of error of the ISI cancellation scheme is basically determined by the probability of error of the tentative detector.…”