Title :
Reduced-complexity turbo equalization for high-density magnetic recording systems
Author :
Supnithi, Pornchai ; Lopes, Renato ; McLaughlin, Steven W.
Author_Institution :
Telecommun. Eng. Dept., King Mongkut´´s Inst. of Technol. Ladkrabang, Bangkok, Thailand
Abstract :
This paper considers a decision-feedback-equalizer (DFE)-based soft decision detector as an alternative for the Bahl-Cocke-Jelinek-Raviv (BCJR) front-end for a coded magnetic recording channel. In previous work, a bidirectional-arbitrated DFE (BAD) was shown to perform in between a BCJR detector and a minimum mean-square error DFE. We propose a soft-output BAD (S-BAD) which takes advantage of the original structure and is suitable for iterative decoding when used with outer codes. We show that with a convolutional code as an outer code, S-BAD performs close to higher complexity detectors.
Keywords :
convolutional codes; decision feedback equalisers; iterative decoding; magnetic recording; turbo codes; Bahl-Cocke-Jelinek-Raviv front-end; NWEPR4; bidirectional-arbitrated DFE; coded magnetic recording channel; convolutional code; decision feedback equalizer; decision-feedback-equalizer; iterative decoding; soft decision detector; soft-output BAD; turbo equalization; Convolutional codes; Decision feedback equalizers; Detectors; Interference cancellation; Intersymbol interference; Iterative decoding; Magnetic recording; Magnetic separation; Matched filters; Nonlinear filters;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2003.816487