An iterative ITI cancellation method for multi-head multi-track bit-patterned magnetic recording systems

Koonkarnkhai, Santi; Kovintavewat, Piya

doi:10.1016/j.dcan.2020.02.003

Cited by 3 publications

(3 citation statements)

References 9 publications

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“…Furthermore, we found that the proposed system is also robust to TMR and media noise, if compared to both the DTDH system using a hard ITI suppression technique and the conventional system. Eventually, it should be pointed out that the proposed technique can also be applied for the m-track m-head (m ≥ 3) detection in BPMR systems, as presented in [26]. .…”

Section: Discussionmentioning

confidence: 99%

A Novel ITI Suppression Technique for Coded Dual-Track Dual-Head Bit-Patterned Magnetic Recording Systems

2020

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Generally, an intertrack interference (ITI) is a critical problem in bit-patterned magnetic recording (BPMR) systems that can attain an areal density (AD) up to 4 Tb/in 2. Unavoidably, at high ADs, a very narrow track width must be employed, leading to severe ITI and unacceptable system performance. To tackle the ITI; therefore, this paper introduces a novel ITI suppression technique for coded dual-track dualhead (DTDH) BPMR systems. At the first turbo iteration, the weighted readback signal of the adjacent track served as an estimated ITI signal is utilized for subtracting from the target readback signal to subside the ITI effect, before passing the refined readback signal to a turbo equalizer. Nonetheless, for the second turbo iteration onwards, the estimated ITI signal generated by the soft information obtained from a decoder at each turbo iteration will be then employed to subtract from the target readback signal during the turbo decoding process. Computer simulation results demonstrate that the proposed system can provide better performance than the DTDH system using a hard ITI suppression technique as well as the conventional system using one read head to decode one data track for all ADs, because the proposed technique can estimate the ITI signal well. Furthermore, when considering the recording system under the effects of media noise and track mis-registration, we also found that the proposed system is more robust than other systems. INDEX TERMS Bit-patterned magnetic recording, ITI suppression, soft information, turbo decoding

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Section: Discussionmentioning

confidence: 99%

A Novel ITI Suppression Technique for Coded Dual-Track Dual-Head Bit-Patterned Magnetic Recording Systems

2020

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“…[4]. Many research works have been conducted to handle the 2D interference, e.g., multi-head multi-track detection [5], neural network-based equalizer and detector [6,7], turbo equalization [5,8], equalizer and target design [9], modified detector [4], arrangement of magnetic island [10,11] and modulation code [12,13].…”

Section: Introductionmentioning

confidence: 99%

An MLP-based skew angle mitigation method for bit-patterned magnetic recording

Koonkarnkhai,

Kankhunthod,

Kovintavewat

2024

IEICE Electron. Express

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Skew angle (SA) is one of the crucial problems in a bit-patterned magnetic recording (BPMR) system. Practically, during the read process, the read head may be tilted up to 30 degrees ( • ) away from the target track. Without the SA detection and correction mechanism, the performance of the BPMR system will be unbearable. This paper proposes a SA mitigation strategy for a BPMR system based on a multilayer perceptron (MLP) so as to estimate and rectify the SA. Specifically, the MLP-based SA estimator extracts the SA amount directly from the readback signal, which will then be used in the MLP-based detector to produce the estimated recording bits. Simulation results show that the proposed method can estimate the SA embedded in the readback signal more precisely than the conventional one, which just uses a look-up table to detect the SA from the target coefficients. Particularly, for the system operating at an areal density (AD) of 3 terabits per square inch with SA = 15 • and 30 • , the suggested system performs better than the system without the SA mitigation method.

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“…In the detection of this GPR target, ITI information is supplied to convert the 2D detection into 1D detection with the same performance and reduced complexity. The proposed scheme extracts the ITI information supplied from multiple GPR targets instead of exploiting multi-head multitrack to subtract the ITI, as in [12,[26][27][28][29]. The proposed model exploits multiple layers of GPR targets to estimate each layer of original data.…”

Section: Introductionmentioning

confidence: 99%

One-Dimensional Detection Using Interference Estimation by Multilayered Two-Dimensional General Partial Response Targets for Bit-Patterned Media Recording Systems

Nguyen

Lee

2022

Applied Sciences

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In bit-patterned media recording (BPMR) systems, two-dimensional (2D) interference, which includes intersymbol and intertrack interference from down- and across-track directions, respectively, increases when the distance between the islands is reduced with increasing areal density. In recent studies, a general partial response (GPR) target was often deployed with the equalizer to estimate and reduce interference. With this combination, the BPMR system becomes a promising candidate for high-density storage systems and achieves high bit error rate (BER) performance. Therefore, in this study, we investigate the detection capability while varying the form of the GPR target and implement a multilayered 2D GPR target and a detection method for improving the accuracy in estimating the interference. The simulation results demonstrate that the proposed model improves by a gain of ~1 dB compared to the previous studies.

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An iterative ITI cancellation method for multi-head multi-track bit-patterned magnetic recording systems

Cited by 3 publications

References 9 publications

A Novel ITI Suppression Technique for Coded Dual-Track Dual-Head Bit-Patterned Magnetic Recording Systems

A Novel ITI Suppression Technique for Coded Dual-Track Dual-Head Bit-Patterned Magnetic Recording Systems

An MLP-based skew angle mitigation method for bit-patterned magnetic recording

One-Dimensional Detection Using Interference Estimation by Multilayered Two-Dimensional General Partial Response Targets for Bit-Patterned Media Recording Systems

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