A reduction in the track width of magnetic recording systems results in a welcome increase in Areal density(Ad),but can severely deteriorate system performance in the unfortunate appearance of extreme Inter-Track Inte...
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A reduction in the track width of magnetic recording systems results in a welcome increase in Areal density(Ad),but can severely deteriorate system performance in the unfortunate appearance of extreme Inter-Track Interference(ITI).The effect of severe ITI may be mitigated by using coding *** this paper,therefore,we present a rate-5/62-dimensional(2d)modulationcode based on a proposed Single-Reader/Two-track Reading(SRTR)technique to cope with this serious problem in staggered Bit-Pattemed Magnetic Recording(BPMR)*** then evaluate the Bit-Error Rate(BER)performance of the proposed system in the presence of media noises,e.g.,position and size *** simulation results indicate that,at the same User density(Ud),the proposed system performs better than an uncoded system by about 1.0 dB at the BER of 105 and is also superior to the conventional recording system.
Nowadays, the growing demand for recording storage is steadily increasing. At high areal densities in magnetic recording system major cause of small bit and track width as a way to overcome 2d interference, which cons...
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ISBN:
(纸本)9781728132716
Nowadays, the growing demand for recording storage is steadily increasing. At high areal densities in magnetic recording system major cause of small bit and track width as a way to overcome 2d interference, which consisting of inter-symbol interference (ISI) and intertrack interference (ITI). One way to improve performance of this problem, we need to be handled by using 2d modulation code with a simulation model in a bit-patterned media recording (BPMR). The previous research of modulationcodes such as constructive ITI (CITI) code was created based on the harddecision. In this work;however, we propose a soft decision output decoding algorithm of a rate-5/6 constructive ITI (CITI) code to utilize it in an iterative decoding process. The proposed use the log-likelihood ratio (LLR) algebra in Boolean logic mappings with a modified2d soft-output Viterbi algorithm (SOVA) detector. When we consider the BER = 10(-6), simulation results show that the proposed encoding anddecoding schemes offer approximately 1.5 and 3 dB gains over the conventional coded system at 2 and 3 Tera-bit per square inch (Tb/in(2)), respectively. In addition, the gains of approximately 0.2 and 1.5 dBs are obtained over that of a harddecision decoding of modulationcode regarding with the same code rate and the same areal density, respectively.
In this paper, we demonstrate how to subtract the intertrack interference (ITI) before the decoding process in multi-track multi-head bit-patterned media recording (BPMR) system, which can obtain a better bit error ra...
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In this paper, we demonstrate how to subtract the intertrack interference (ITI) before the decoding process in multi-track multi-head bit-patterned media recording (BPMR) system, which can obtain a better bit error rate (BER) performance. We focus on the three-track/threehead BPMR channel and propose the ITI subtraction technique that performs together with a rate-5/6 two dimensional (2d) modulationcode. Since the coded system can provide the estimated recorded bit sequence with a high reliability rate for the center track. However, the upper and lower data sequences still be interfered with their sidetracks, which results to have a low reliability rate. Therefore, we propose to feedback the data from the center and upper tracks for subtracting the ITI effect of the lower track. Meanwhile, the feedback data from the center and lower tracks will be also used to subtract the ITI effect of the upper track. The use of our proposed technique can effectively reduce the severity of ITI effect which caused from the two sidetracks. The computer simulation results in the presence of position and size fluctuations show that the proposed system yields better BER performance than a conventional coded system, especially when an areal density (Ad) is ultra high.
This study presents a 9/12 two-dimensional (2d) modulationcode as a way to overcome 2d intersymbol interference (ISI) in high-density storage systems. The next generation of data-storage systems is being continually ...
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This study presents a 9/12 two-dimensional (2d) modulationcode as a way to overcome 2d intersymbol interference (ISI) in high-density storage systems. The next generation of data-storage systems is being continually developed to satisfy a massive demand for reliable storage regarding enormous amounts of data. Holographic data storage, bit-patterned media recording (BPMR), and2d magnetic recording are promising candidates for the attainment of area-density increases that are beyond the capacities of conventional storage systems. One of the main challenges for these systems is a 2d ISI problem consisting of 1d ISI from neighbour bits and intertrack interference from adjacent tracks. The proposedmodulationcode maps every 9 bit sequence of user data into a 2d output array of a 3-by-4 size so that the fatal 2d ISI patterns are avoided in every output array. For the assessment of the quality of the proposedmodulationcode, a simulation model is carried out in a BPMR system. The results show that the proposedmodulationcode offers a gain of approximate to 2 dB over that of a system without encoding. In particular, a gain of approximate to 1 dB is obtained over that of a 6/8 modulationcode regarding the same code rate.
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