A Rate-8/9 2-D Modulation Code for Bit-Patterned Media Recording

Kovintavewat, Piya; Arrayangkool, Auttasith; Warisarn, Chanon

doi:10.1109/tmag.2014.2316203

Cited by 31 publications

(10 citation statements)

References 9 publications

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“…On the read channel, the readback waveforms, r l−1 (t), r l (t), and, r l+1 (t) are filtered using a low pass filter and sampled into discrete time sequences. The readback samples r k,l are then equalized by 2D finite impulse response (FIR) equalizers, which are designed based on a minimum mean-squared error approach with a fixed 3 × 3 2D generalized partial response (GPR) target [9], [10]. The 2D GPR target coefficients can be obtained from the reader sensitivity by sampling the reader sensitivity at the center of the bit cell area at center bit and its 8 neighboring bits.…”

Section: Tdmr Channel Modelmentioning

confidence: 99%

An Effective Track Width with a 2D Modulation Code in Two-Dimensional Magnetic Recording (TDMR) Systems

Pituso

Warisarn

Tongsomporn³

2019

IEICE Trans. Electron.

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When the track density of two-dimensional magnetic recording (TDMR) systems is increased, intertrack interference (ITI) inevitably grows, resulting in the extreme degradation of an overall system performance. In this work, we present coding, writing, and reading techniques which allow TDMR systems with multi-readers to overcome severe ITI. A rate-5/6 two-dimensional (2D) modulation code is adopted to protect middle-track data from ITI based on cross-track data dependence. Since the rate-5/6 2D modulation code greatly improves the reliability of the middle-track, there is a bit-error rate gap between middle-track and sidetracks. Therefore, we propose the different track width writing technique to optimize the reliability of all three data tracks. In addition, we also evaluate the TDMR system performance using an user areal density capability (UADC) as a main key parameter. Here, an areal density capability (ADC) can be measured by finding the bit-error rate of the system with sweeping track and linear densities. The UADC is then obtained by removing redundancy from the ADC. Simulation results show that a system with our proposed techniques gains the UADC of about 4.66% over the conventional TDMR systems. key words: two-dimensional magnetic recording (TDMR), 2D modulation code, intertrack interference (ITI)

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Section: Tdmr Channel Modelmentioning

confidence: 99%

An Effective Track Width with a 2D Modulation Code in Two-Dimensional Magnetic Recording (TDMR) Systems

Pituso

Warisarn

Tongsomporn³

2019

IEICE Trans. Electron.

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“…Furthermore, Warisarn et al [11] and Kovintavewat et al [12] utilized a 2D modulation code to avoid fatal data patterns that cause severe ITI to be stored on a magnetic medium; however, these methods required large memory to encode and decode the data. Hence, Chang and Cruz [13] employed the joint track concept to design the equalizer suitable for a staggered BPMR system, whereas Fujii and Shinohara [14] proposed the ISI and ITI cancellation technique by using a multi-track iterative method for a shingled write recording system.…”

Section: Introductionmentioning

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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“…To overcome the challenge presented by 2D ISI, many solutions regarding the readback part have been suggested in previous reports including the following: (i) solutions based on 2D equalisation [5, 6], (ii) solutions based on 2D soft output Viterbi algorithm (SOVA) [7–9], and (iii) solutions based on the principle of turbo equalisation [10–12]. Alternatively, a user‐data encoding procedure is also used for the writing part in ultra‐high‐density storage systems [13–20]. Applying advanced encoding schemes such as the low‐density parity‐check code, one of the turbo codes, for these systems yields the significant improvements regarding the system performance [13–15].…”

Section: Introductionmentioning

confidence: 99%

“…A conservatively constrained, multimode 2D balanced code was introduced for holographic storage [17], whereas Groenland and Abelmann [18] introduced a 7/9 2D channel code where ‘one’ and ‘zero’ bits are fixed to avoid the 2D interference at every 3‐by‐3 data array. Further, a 6/8 modulation code with non‐isolated patterns was introduced in [19] for the mitigation of the 2D ISI problem, and an 8/9 modulation code [20] was recently investigated to eliminate the 2D interference in a BPMR system. In this study, we propose a 9/12 modulation code for the mitigation of not only 2D ISI patterns, but also the effect of ITI patterns.…”

Section: Introductionmentioning

confidence: 99%

“…The 2D array is designed in such a manner that the 2D ISI and ITI patterns do not exist in any part of the 2D output array, but a reasonable Hamming distance is still retained between the codewords. To assess the performance of the proposed modulation code, we compared the proposed scheme with the following three cases, (i) non‐encoding; (ii) the 6/8 2D modulation code [19] regarding the same code rate; and (iii) the 8/9 2D modulation code [20] that is the most recent 2D modulation code applied for BPMR systems. The simulation result shows that the proposed model offers a superior bit error rate (BER) performance compared with those of the other approaches.…”

Section: Introductionmentioning

confidence: 99%

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Elimination of two‐dimensional intersymbol interference through the use of a 9/12 two‐dimensional modulation code

Nguyen

Lee

2016

IET Communications

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A Rate-8/9 2-D Modulation Code for Bit-Patterned Media Recording

Cited by 31 publications

References 9 publications

An Effective Track Width with a 2D Modulation Code in Two-Dimensional Magnetic Recording (TDMR) Systems

An Effective Track Width with a 2D Modulation Code in Two-Dimensional Magnetic Recording (TDMR) Systems

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

Elimination of two‐dimensional intersymbol interference through the use of a 9/12 two‐dimensional modulation code

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