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Author: search.filters.author.Buajong, ChaiwatSubject: search.filters.subject.BPMR

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    An Intertrack Interference (ITI) subtraction scheme for bit-patterned media recording
    (2021-05-19)
    Buajong, Chaiwat
    ;
    Warisarn, Chanon
    ;
    Koonkarnkhai, Santi
    ;
    Kovintavewat, Piya
    Currently, hard disk drive has been struggled to overcome the super-paramagnetic limit that restricts the density increment. Bit-patterned magnetic recording (BPMR) is a candidate that can increase an areal density (AD) up to 4 Tb/in2. However, inter-track interference (ITI) arising from a narrow track width at high AD severely degrades the system performance. This study proposes the ITI subtraction technique with turbo iteration in a coded BPMR system. This method refines the equalized sequence by subtracting the ITI using an imitated ITI sequence that is generated by the soft information obtained from turbo iteration and ITI coefficients. The refined sequence that contains the partial ITI is sent to the turbo iteration as many rounds as needed. Simulation results indicate that the proposed system outperforms the conventional system whether or not media noise is considered.
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    Multitrack reading scheme with single reader in BPMR systems
    (2017-10-19)
    Buajong, Chaiwat
    ;
    Warisarn, Chanon
    In ultra-high track density magnetic recording such as bit-patterned media recording (BPMR), the narrow track reader is required to avoid the strong intertrack interference (ITI). However, the reduction of reader size to the track pitch is considerably difficult. Therefore, this paper proposes to use the multitrack reading scheme with the staggered island BPMR. The effects of the island size and position fluctuation are investigated. Then, two-dimensional (2D) decoding scheme will be considered to mitigate the reader's narrow track width requirement by oversampling technique. Moreover, both the threshold and Partial Response Maximum Likelihood (PRML) detection were also examined the system performance. Simulation results indicate that the proposed system outperforms the conventional reading system, especially for high areal density.