One-pairs codes for partial response magnetic recording

Author

McLaughlin, Steven W. ; Lee, Patrick ; Cloke, Robert ; Vasic, Bane V.

Author_Institution

Sch. of Electr. & Comput. Eng., Georgia Inst. of Technol., Atlanta, GA, USA

Volume

35

Issue

3

fYear

1999

fDate

5/1/1999 12:00:00 AM

Firstpage

2080

Lastpage

2086

Abstract

We consider a new constraint on stored data in partial response digital magnetic recording. The one-pairs constraint is an upper bound on the maximum number of symbols between pairs of ones in a coded sequence and can be considered as an alternative to the widely used (0, G/I) constraint. The constraint limits quasi-catastrophic error propagation and guarantees the occurrence of superior timing corrections in partial response class IV (PR4) and extended PR4 (EPR4) magnetic recording systems. In this paper we give low complexity rate 8/9, 16/17, and 24/25 block codes, derive the capacity of this constraint, and compute the power spectral density for maxentropic codes. The codes achieve greater than 95% of channel capacity and the 24/25 code has smaller than expected error propagation

Keywords

block codes; channel capacity; constraint handling; digital magnetic recording; partial response channels; timing; 24/25 code; block codes; channel capacity; coded sequence; complexity rate; digital magnetic recording; error propagation; extended PR4; maxentropic codes; one-pairs codes; partial response class IV; partial response magnetic recording; power spectral density; quasi-catastrophic error propagation; stored data; timing corrections; upper bound; Block codes; Channel capacity; Digital magnetic recording; Error correction; Intersymbol interference; Magnetic recording; Maximum likelihood decoding; Signal processing; Timing; Upper bound;

fLanguage

English

Journal_Title

Magnetics, IEEE Transactions on

Publisher

ieee

ISSN

0018-9464

Type

jour

DOI

10.1109/20.764917

Filename

764917