Simplified EEPR Viterbi detector based on a transformed radix-4 trellis for a disk drive

Citation
K. Tsukano et al., Simplified EEPR Viterbi detector based on a transformed radix-4 trellis for a disk drive, IEEE MAGNET, 35(5), 1999, pp. 4387-4401
Citations number
16
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
IEEE TRANSACTIONS ON MAGNETICS
ISSN journal
0018-9464 → ACNP
Volume
35
Issue
5
Year of publication
1999
Part
3
Pages
4387 - 4401
Database
ISI
SICI code
0018-9464(199909)35:5<4387:SEVDBO>2.0.ZU;2-O
Abstract
A simplified EEPR Viterbi detector based on a transformed radix-4 trellis u sing 16/17 maximum transition run (MTR) code is developed. The transformed radix-4 trellis is a radix-4 trellis applying the transformed trellis in or der to reduce complexity. The proposed Viterbi detector also applies a new simplification method that eliminates low likely states according to the eq ualized data (inputs of the detector). By this simplification, the ACS circ uit size can be reduced to 60% as compared to the original radix-4 Viterbi detector. Moreover, the necessary path memory length for the Viterbi detect or is theoretically derived by estimating the probability of the error patt erns which can occur on the EEPRML channel using the 16/17 MTR code. Simula tions show that the performance of the simplified Viterbi detector does not degrade on such a channel. The proposed simplification of the Viterbi dete ctor is a useful way to implement the high-speed and low-power EEPR Viterbi detector.