An extended dual decision-feedback equalizer for high-density perpendicular magnetic recording channels

Choongchae Woo, Hangyu Cho, Daesik Hong

Research output: Contribution to journalConference articlepeer-review


Partial-response maximum-likelihood (PRML) systems are powerful and indispensable for high-density perpendicular magnetic recording channels. However, high-order partial-response (PR) targets must be considered because of severe intersymbol interference (ISI). On the other hand, decision feedback equalization (DFE) has very low complexity. DFE can he used with high code rate modulation codes, thanks to the fact that DFE does not use a minimum run constraint as a multilevel DFE (MDFE). At high recording densities, dual detection schemes such as dual DFE (DDFE) significantly improve performance and reduce error propagation. So, we compare DDFE detectors with PR(1221)ML and PR(12321)ML on 16/17 maximum transition run (MTR) (3,11)-coded perpendicular magnetic recording channels and propose an extended DDFE that represents a dual version of the DDFE. Simulation results show that the DDFE has a bit-error-rate (BER) performance comparable to that for PR(12321)ML. Our extended DDFE in turn shows a performance gain over DDFE and PR(12321)ML at the normalized recording densities 3 and 4.

Original languageEnglish
Pages (from-to)2343-2345
Number of pages3
JournalIEEE Transactions on Magnetics
Issue number5 I
Publication statusPublished - 2002 Sept
Event2002 International Magnetics Conference (Intermag 2002) - Amsterdam, Netherlands
Duration: 2002 Apr 282002 May 2

Bibliographical note

Funding Information:
Manuscript received February 12, 2002; revised June 5, 2002. This work was supported by the Korea Science and Engineering Foundation. The authors are with the Information and Telecommunication Laboratory, Yonsei University, 120-749 Seoul, Korea (e-mail: Digital Object Identifier 10.1109/TMAG.2002.801900.

All Science Journal Classification (ASJC) codes

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


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