2-D Write/Read Channel Model for Bit-Patterned Media Recording With Large Media Noise

In bit-patterned media recording (BPMR) channels, the inter-track interference (ITI) is extremely severe at ultra high areal densities, which significantly degrades the system performance. The partial-response maximum-likelihood (PRML) technique that uses an one-dimensional (1D) partial response target might not be able to cope with this severe ITI, especially in the presence of media noise and track mis-registration (TMR). This paper describes the target and equalizer design for highdensity BPMR channels. Specifically, we proposes a two-dimensional (2D) cross-track asymmetric target, based on a minimum mean-squared error (MMSE) approach, to combat media noise and TMR. Results indicate that the proposed 2D target performs better than the previously proposed 2D targets, especially when media noise and TMR is severe.

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Information Theoretical Analysis of a New Write Channel Model for Bit-Patterned Media Recording

IEEE Transactions on Magnetics ◽

10.1109/tmag.2020.2970830 ◽

2020 ◽

Vol 56 (4) ◽

pp. 1-9

Author(s):

Fatemeh Ghanami ◽

Ghosheh Abed Hodtani

Keyword(s):

Theoretical Analysis ◽

Channel Model ◽

Bit Patterned Media ◽

Patterned Media

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Write Channel Model for Bit-Patterned Media Recording

IEEE Transactions on Magnetics ◽

10.1109/tmag.2010.2080667 ◽

2011 ◽

Vol 47 (1) ◽

pp. 35-45 ◽

Cited By ~ 34

Author(s):

Aravind Raghava Iyengar ◽

Paul H. Siegel ◽

Jack Keil Wolf

Keyword(s):

Channel Model ◽

Bit Patterned Media ◽

Patterned Media

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A General Write Channel Model for Bit-Patterned Media Recording

IEEE Transactions on Magnetics ◽

10.1109/tmag.2014.2364794 ◽

2015 ◽

Vol 51 (5) ◽

pp. 1-12 ◽

Cited By ~ 3

Author(s):

Sima Naseri ◽

Ghosheh Abed Hodtani

Keyword(s):

Channel Model ◽

Bit Patterned Media ◽

Patterned Media

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Trellis-Based Detecting the Insertion and Deletion Bits for Bit-Patterned Media Recording

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.979.54 ◽

2014 ◽

Vol 979 ◽

pp. 54-57 ◽

Cited By ~ 1

Author(s):

Santi Koonkarnkhai ◽

Piya Kovintavewat ◽

Phongsak Keeratiwintakorn

Keyword(s):

Detection Method ◽

Signal To Noise Ratio ◽

Areal Density ◽

Specific Marker ◽

Magnetic Medium ◽

Bit Patterned Media ◽

Patterned Media ◽

Media Noise ◽

Insertion And Deletion ◽

Better Than

Bit-patterned media recording (BPMR) is one of the promising technologies for realizing an areal density up to 4 Tb/in2; however, it poses new challenges to read channel design, including the two-dimensional (2D) interference, media noise, and track mis-registration. Furthermore, the BPMR system encounters the insertion, deletion and substitution errors, which are primarily caused by mis-synchronization between the write clock and the island positions. In this paper, we propose a novel detection method that exploits the trellis structure to detect the occurrence of insertion/deletion bits. Specifically, the specific marker bits are inserted periodically inside an input data sequence before recording onto a magnetic medium. Hence, the branch metric calculation is monitored during the marker bits to determine if there is any insertion/deletion error in the system. Numerical results indicate that the proposed method can performs better than the conventional one in terms of the percentage of detection and the percentage of missed detection and false-alarm, especially at low signal-to-noise ratio scenario.

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