Multi-track iterative ITI canceller for shingled write recording

Fujii, Minoru; Shinohara, Nobuhiko

doi:10.1109/iscit.2010.5665146

Cited by 12 publications

(10 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…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. Yao et al [15] proposed and analyzed the 2D maximum-likelihood page detection to cope with the ISI and ITI effects in BPMR and page-oriented optical memory systems.…”

Section: Introductionmentioning

confidence: 99%

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

2020

View full text Add to dashboard Cite

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

show abstract

Section: Introductionmentioning

confidence: 99%

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

2020

View full text Add to dashboard Cite

show abstract

“…Iterative ITI cancellation, which removes ITI from each single-track readback signal before detection. is explored in [3] and [4]. These SHST techniques achieve acceptable performance when ITI is low, but suffer as ITI becomes severe.…”

Section: Introductionmentioning

confidence: 99%

“…In this paper we study a linear and symmetric two-head/twotrack (2H2T) model such as that used in [4] [5] [6] [7]. One problem associated with ITI is how to estimate the response from an adjacent track.…”

Section: Introductionmentioning

confidence: 99%

Multihead multitrack detection in shingled magnetic recording with ITI estimation

Fan

Thapar

Siegel

2015

2015 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

Multitrack detection for shingled magnetic recording (SMR) using a two-head array system is considered. The channel suffers from intersymbol interference (ISI) in the downtrack direction and intertrack interference (ITI) in the crosstrack direction. We propose a practical multihead/multitrack detector that provides a low-complexity approach to adaptive estimation of time-varying ITI. The performance of the proposed detection algorithm is analyzed in terms of its minimum distance parameter, and simulation results show that the proposed detector offers a performance advantage in settings where complexity constraints limit the maximum-likelihood two-track detector to use a static ITI estimate.

show abstract

“…Both these challenges are met in this paper and the proposed algorithms are corroborated with simulation and experimental results. In past, various schemes have been proposed for ITI cancelation but these schemes don't consider the presence of frequency offset in the data [8], [9].…”

Section: Introductionmentioning

confidence: 99%

Inter-track interference cancelation in presence of frequency offset for shingled magnetic recording

Kumar

Bellorado

Marrow

et al. 2013

2013 IEEE International Conference on Communications (ICC)

View full text Add to dashboard Cite

The enormous growth of consumer electronic industry is driving the need for achieving ultra-high areal storage densities. Shingled magnetic recording (SMR) is a promising high density storage technique where shingles are created by overlapping tracks for increasing the track per inch (TPI) and achieving higher areal densities. High TPI values, however, introduce sidetrack interference in the equalized output of the center track sensed through the read head. The problem of removing interference from the center track signal can be formulated as estimating pulse shapes of sidetracks assuming sidetracks are decodable. In this paper, we first propose a solution using the correlation method for estimating the pulse shape and the phase-misalignment. The correlation method fails when there is a frequency offset present from sidetracks. Furthermore, we devise a solution based on the least mean square (LMS) algorithm which can provide time varying estimates of the sidetrack pulse shapes and remove the interference from the center track signal. Experimental and simulation results which corroborate the analysis of the proposed algorithm, demonstrate that the proposed algorithm outperforms other techniques and gives the minimum bit error rate (BER). The complexity of the proposed algorithm is low and it can be easily implemented on the hardware.

show abstract

Multi-track iterative ITI canceller for shingled write recording

Cited by 12 publications

References 11 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

Multihead multitrack detection in shingled magnetic recording with ITI estimation

Inter-track interference cancelation in presence of frequency offset for shingled magnetic recording

Contact Info

Product

Resources

About