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The MAP in LC Decoding of MTR Codes in Two-Track Magnetic Recording Systems

Authors:
Nikola Djuric
Vojin Senk

Keywords: constrained coding; MTR codes; soft-decision de-coding; multiple-head recording

Abstract:
The maximum a posteriori probability (MAP) algorithm has recently been implemented in Boolean logic circuits (MAP in LC) and presented as an additional method for soft-decision decoding of maximum-transition-run (MTR) codes. Substantial benefits were noticed when the MAP in LC method was used for decoding in an MTR encoded one-track one-head E2PR4 magnetic recording channel. Those benefits reveal the great potential of possible employment of MTR codes in iterative decoding schemes. Having in mind that MTR codes are able to reduce the overall complexity of trellis channel detection, their utilization in magnetic recording systems with multiple-tracks multiple-heads could be valuable. In this paper, the performance of the MAP in LC decoding was considered in the in-track MTR encoded two-track two-head E2PR4 channel. The subversion named as max-log MAP in LC is presented and compared with min-max in LC and max-log MAP approach for MTR decoding. In case of the low-level inter-track interference over the recording channel, the max-log MAP in LC subversion shows nearly 1 dB of decoding gain, for BER = 10-5, when rate 4/5 (2, 8) MTR was used.

Pages: 58 to 63

Copyright: Copyright (c) IARIA, 2013

Publication date: April 21, 2013

Published in: conference

ISSN: 2308-4022

ISBN: 978-1-61208-263-9

Location: Venice, Italy

Dates: from April 21, 2013 to April 26, 2013