Dropout compensation in magnetic tape channels by adaptive equalization and coding

Author

Steingrimsson, Baldur ; Moon, Jaekyun

Author_Institution

Dept. of Electr. & Comput. Eng., Minnesota Univ., Minneapolis, MN, USA

Volume

37

Issue

6

fYear

2001

fDate

11/1/2001 12:00:00 AM

Firstpage

3981

Lastpage

3993

Abstract

A simple adaptive extended partial response IV (EPR4) equalizer with an adaptive gain controller driven by a threshold detector with relaxed thresholds can be applied effectively on fading tape channels. The equalizer closely approximates the performance of the optimal EPR4 equalizer. Other EPR4 equalizers with certain advantageous features (the EPR4 equalizer with decision feedback and the PW₅₀-based EPR4 equalizer) are also studied. The parallel concatenated parity check (PCPC) code with iterative decoding is quite effective in mitigating the dropout effect. The complexity/performance tradeoffs of the PCPC code seem favorable compared to the low-density parity check code or to the turbo code

Keywords

adaptive codes; adaptive equalisers; concatenated codes; decision feedback equalisers; digital magnetic recording; error correction codes; error detection codes; fading channels; iterative decoding; magnetic tapes; PCPC code; PW₅₀-based EPR4 equalizer; adaptive coding; adaptive equalization; adaptive extended partial response IV equalizer; adaptive gain controller; complexity/performance tradeoffs; decision feedback; dropout compensation; fading tape channels; iterative decoding; low-density parity check code; magnetic tape channels; optimal EPR4 equalizer; parallel concatenated parity check code; threshold detector; turbo code; Adaptive control; Concatenated codes; Detectors; Equalizers; Fading; Feedback; Iterative decoding; Parity check codes; Programmable control; Turbo codes;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.966136

Filename

966136