Rueangnetr, Natthakan

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Rueangnetr, Natthakan
Alternative Name
Rueangnetr, N.
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Email
natthakan.ru@kmitl.ac.th

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    Item type:Publication,
    Combining Unequal Bit Islands and Coding Design for Areal Density Enhancing in Dual-Layer Bit-Patterned Magnetic Recording Systems
    (2026-01-01)
    Sriyapai, R.
    ;
    Rueangnetr, N.
    ;
    Koonkarnkhai, S.
    ;
    Warisarn, C.
    In this work, we propose an alternating media structure for a dual-layer bit-patterned magnetic recording (DL-BPMR), in which the diameters of the bit islands in the bottom and top layers differ, with the bottom diameter 4 times that of the top. We then propose an encoding scheme that uses the larger bit island in the bottom layer for a parity bit to detect errors during decoding. Moreover, we suggest the log-likelihood ratio (LLR) flipping technique to improve decoding capability, which operates jointly during decoding. Simulation results show that at the same user density (UD), our proposed systems outperform the conventional single-layer (SL) BPMR. For instance, at a bit-error rate of 10<sup>-3</sup> and total UDs of 2.0 or 3.2 Terabit per square inch, the proposed systems provide approximately 0.8 dB and 1.2 dB, respectively, over the conventional SL-BPMR systems.
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    Item type:Publication,
    Inter-Layer Interference (ILI) Suppression in Dual-Layer Bit-Patterned Magnetic Recording Systems
    (2026-01-01)
    Rueangnetr, Natthakan
    ;
    Koonkarnkhai, Santi
    ;
    Greaves, Simon John
    ;
    Warisarn, Chanon
    Dual-layer bit-patterned magnetic recording (DL-BPMR) systems are promising for achieving higher areal densities (ADs). However, they face significant challenges, including inter-symbol interference (ISI), inter-track interference (ITI), and inter-layer interference (ILI). To address these issues, this work proposes integrating a sum-soft-information (SSI) technique and an ILI suppression method to enhance detection reliability. The SSI technique is initially used to improve the reliability of the log-likelihood ratio (LLR) for the bottom layer signal by leveraging the mutual information derived from a staggered array reader configuration. The enhanced data sequence of the bottom layer is subsequently utilized to suppress ILI by applying a weighting before being removed from the mixed readback signal. The separated readback signal of the top layer is then processed using well-predesigned equalizers and detectors. Simulation results demonstrate that the proposed method significantly improves bit error rate (BER) performance compared to conventional single-layer and DL-BPMR systems, particularly at a user density of 4.0 Tb/in2, making it a promising approach for next-generation high-density magnetic recording.
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    Item type:Publication,
    Feasibility Study of Implementing Simple Dual-bit Detection in Dual-Layer Bit-Patterned Magnetic Recording Systems
    (2025-09-01)
    Rueangnetr, Natthakan
    ;
    Greaves, Simon John
    ;
    Warisarn, Chanon
    Dual-layer bit-patterned magnetic recording (DL-BPMR) systems, which combine bit-patterned magnetic recording (BPMR) and multi-layer magnetic recording technologies, are expected to increase the areal density (AD) of data storage up to 10 Terabits per square inch. However, to achieve this goal, several challenges must be overcome, including low response signals from the lower layer and interlayer interference. Therefore, this work proposes a signal processing technique to reduce the number of erroneous bits at the receiver. A simple dual-bit detection (SD-BD) method is proposed. Simulation results comparing the performance of a single-layer BPMR system with that of a DL-BPMR system using the SD-BD signal processing technique show that the latter can effectively reduce the bit error rate. The results indicate that the SD-BD technique has the potential to improve the read accuracy of the DL-BPMR system and is an essential step towards the future development of data recording technologies with higher AD.