Joint Timing Recovery and Signal Detection for Two-Dimensional Magnetic Recording

Matcha, Chaitanya Kumar and Srinivasa, Shayan Garani (2017) Joint Timing Recovery and Signal Detection for Two-Dimensional Magnetic Recording. In: IEEE TRANSACTIONS ON MAGNETICS, 53 (2).

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Abstract

Two-dimensional magnetic recording (TDMR) is a promising technology for boosting areal densities using sophisticated signal processing algorithms within a systems framework. The channel impairments comprise of 2-D intersymbol interference (ISI), 2-D synchronization errors along with media, and electronic noise sources, making it challenging for designing optimum algorithms and architectures for read/write channels. In this paper, we propose a novel iterative joint timing and signal detection algorithm to handle synchronization errors along with the 2-D ISI for TDMR channels. Our work is novel in two aspects: 1) we develop a discrete timing error model using 2-D random walk by incorporating correlated timing drifts due to phase and frequency offsets and 2) we develop a 2-D joint timing and signal detection engine for handling 2-D ISI constraints along with timing errors toward near maximum likelihood detection. The proposed 2-D joint timing-detection algorithm can be iteratively configured and observed to achieve a significant signal-to-noise ratio gain of > 1.2 dB in bit error rate performance (translating to similar to 10% increase in areal densities around the 1 Tb/in(2) regime with the grain sizes of 10 nm and the bit sizes of 25x25 nm) at the output of 2-D soft-output Viterbi algorithm (SOVA) as compared with a standalone timing loop coupled to a 2-D detector in an open-loop configuration. The efficacy of our proposed algorithm and system architecture is evaluated via simulations for TDMR configurations comprising of a 2-D generalized partial response equalization along the 2-D SOVA with data-dependent noise prediction capability over the Voronoi media model.

Item Type:	Journal Article
Publication:	IEEE TRANSACTIONS ON MAGNETICS
Publisher:	IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Additional Information:	Copy right for this article belongs to the IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC, 445 HOES LANE, PISCATAWAY, NJ 08855-4141 USA
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	03 Apr 2017 04:37
Last Modified:	03 Apr 2017 04:37
URI:	http://eprints.iisc.ac.in/id/eprint/56435

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