Title :
Interleaved maximum likelihood decoding in high-order partial responses for high-speed magnetic recording systems
Author_Institution :
Central Res. Lab., Hitachi Ltd., Tokyo, Japan
Abstract :
A high-order partial response (PR) that is generally represented by (1+D)(1-Dn) and provides both high density and high speed in hard disk drive (HDD) signal processing is proposed. By using a pre-coding 1/(1+D), the n-bit interleaving operation for high-speed processing can be used. When n=3, the reduced equalization noise gain is about 4 dB higher than in the conventional PR4 at a channel density of 3.0, and the same squared Euclidean distance as with the PR4ML is attained in a 3-bit interleaving maximum likelihood detector. High-order PR channels for perpendicular recording are also proposed
Keywords :
Viterbi detection; channel coding; digital magnetic recording; hard discs; interleaved codes; maximum likelihood decoding; partial response channels; signal processing; PR4; PR4ML; Viterbi detector; channel density; equalization noise gain; hard disk drive signal processing; high density recording; high-order PR channels; high-order partial responses; high-speed magnetic recording systems; high-speed processing; interleaved maximum likelihood decoding; interleaving maximum likelihood detector; perpendicular recording; precoding interleaving operation; squared Euclidean distance; Detectors; Frequency; Interleaved codes; Laboratories; Magnetic recording; Maximum likelihood decoding; Maximum likelihood detection; Perpendicular magnetic recording; Polynomials; Signal processing;
Conference_Titel :
Global Telecommunications Conference, 1996. GLOBECOM '96. 'Communications: The Key to Global Prosperity
Conference_Location :
London
Print_ISBN :
0-7803-3336-5
DOI :
10.1109/GLOCOM.1996.594393
