Soft-output decoding of 2D modulation codes for bit-patterned media recording

Warisarn, C.; Kovintavewat, P.

doi:10.1109/INTMAG.2015.7157703

Soft-output decoding of 2D modulation codes for bit-patterned media recording

Author(s)

Warisarn, C.

Kovintavewat, P.

Date Issued

July 14, 2015

Type

Conference Paper

DOI

10.1109/INTMAG.2015.7157703

Abstract

The two-dimensional (2D) interference is a major impairment in bit-patterned media recording (BPMR) systems because of small bit and track pitches, especially at high recording densities [1]. To mitigate this problem, we introduced 2D modulation codes [2-3], which output only the hard decision, for an uncoded BPMR system (i.e., without error-correction codes). To utilize a rate-4/5 constructive inter-track interference (CITI) code [2] in the coded BPMR system, which employs a low-density parity-check (LDPC) code, we propose the log-likelihood ratio (LLR) algebra implementation in Boolean logic mappings for the CITI coding scheme. Then, this soft CITI coding scheme together with a modified 2D soft-output Viterbi algorithm (2D-SOVA) detector [4] and a LDPC decoder will jointly perform iterative decoding.

Citation

2015 IEEE International Magnetics Conference Intermag 2015, 2015