MAP decoding of MTR codes in multiple-head magnetic recording systems

This paper considers maximum a posteriori (MAP) decoding of the maximum transition run (MTR) codes, over two-head digital magnetic recording system. Decoding is based on Bayesian algorithm and computes a posteriori log-likelihood ratios (LLR) from codewords of the MTR code. In this paper we present simulation results for performance of the joint soft detection-decoding of a concatenation of MTR code and low-density parity-check (LDPC) code over the two-track two-head extended class four partial response channel (E2PR4). In channels with low inter-track interference (ITI), the joint detector-decoder exhibits 1.7dB gain.

[1]  Paul H. Siegel,et al.  Error-Event Characterization on Partial-Response Channels , 1999, IEEE Trans. Inf. Theory.

[2]  Bane Vasic,et al.  Kirkman systems and their application in perpendicular magnetic recording , 2002 .

[3]  Nikola Djuric,et al.  Methods for the Soft-Decision Decoding of MTR Codes in Multiple-Head Magnetic Recording Systems , 2010, 2010 IEEE International Conference on Communications.

[4]  Joachim Hagenauer,et al.  Source-controlled channel decoding , 1994, Proceedings of 1994 IEEE International Symposium on Information Theory.

[5]  Paul H. Siegel,et al.  Constrained coding for binary channels with high intersymbol interference , 1999, IEEE Trans. Inf. Theory.

[6]  Brendan J. Frey,et al.  Factor graphs and the sum-product algorithm , 2001, IEEE Trans. Inf. Theory.

[7]  Jaekyun Moon,et al.  Maximum transition run codes for data storage systems , 1996 .

[8]  J. R. Cruz,et al.  Enforcing maximum-transition-run code constraints and low-density parity-check decoding , 2004, IEEE transactions on magnetics.

[9]  H. Thapar,et al.  A class of partial response systems for increasing storage density in magnetic recording , 1987 .

[10]  Radford M. Neal,et al.  Near Shannon limit performance of low density parity check codes , 1996 .

[11]  Nikola Duric,et al.  Soft-Output Decoding in Multiple-Head MTR Encoded Magnetic Recording Systems , 2006, 2006 IEEE International Conference on Communications.

[12]  Emina Soljanin,et al.  Multihead Detection for Multitrack Recording Channels , 1998, IEEE Trans. Inf. Theory.

[13]  Nikola Duric,et al.  MAP decoding of MTR codes in LDPC-MTR encoded magnetic recording systems , 2009, 2009 9th International Conference on Telecommunication in Modern Satellite, Cable, and Broadcasting Services.

[14]  L.C. Barbosa.  Simultaneous detection of readback signals from interfering magnetic recording tracks using array heads , 1990, International Conference on Magnetics.

[15]  Brian H. Marcus,et al.  Maximum transition run codes for generalized partial response channels , 2001, IEEE J. Sel. Areas Commun..