Generalized belief propagation detector for TDMR microcell model

Seyed Mehrdad Khatami, Bane Vasič

Research output: Contribution to journalArticle

18 Scopus citations

Abstract

Signal processing in TDMR encounters several challenges such as read channel modeling and detection in the presence of severe two-dimensional intersymbol interference (2-D ISI). The contribution of this paper is twofold. 1) In this paper, we introduce a novel 2-D read channel model which we call the 2-D Microcell model. In this model, we use generalized 2-D microtracks called microcells to captures the properties of irregular grain boundaries of the medium in a relatively simple yet accurate manner. The data dependent noise (DDN) distributions are analytically derived for this model. The derivation of the DDN distributions makes the 2-D Microcell suitable for detector design purposes. 2) We propose a new framework for designing truly two-dimensional detectors for the Microcell model based on near-optimal generalized belief propagation (GBP). The GBP algorithm is purposefully applied for detection in this model in order to handle the data dependent media noise which is caused by irregular bit transitions in both dimensions. Results are provided to show that the incorporation of the DDN distributions into the GBP detection helps improving the detection performance.

Original languageEnglish (US)
Article number6559027
Pages (from-to)3699-3702
Number of pages4
JournalIEEE Transactions on Magnetics
Volume49
Issue number7
DOIs
StatePublished - Aug 2 2013

Keywords

  • 2-D microcell model
  • Data dependent noise
  • generalized belief propagation (GBP)
  • intersymbol interference (ISI)
  • two dimensional magnetic recording (TDMR)

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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