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

• Published in: IET communications Vol. 10; no. 14; pp. 1730 - 1735
• Main Authors: Nguyen, Chi Dinh, Lee, Jaejin
• Format: Journal Article
• Language: English
• Published: The Institution of Engineering and Technology 20.09.2016
• Subjects: 1D ISI; 2D intersymbol interference elimination; 2D ISI problem; 2D magnetic recording; 2D modulation code; adjacent tracks; area‐density; Arrays; bit‐patterned media recording; BPMR system; Data storage; Gain; high‐density storage systems; holographic data storage; Interference; interference suppression; intersymbol interference; intertrack interference; Magnetic recording; Modulation; modulation coding; next generation data‐storage systems; quality assessment; Storage systems; two‐dimensional intersymbol interference; two‐dimensional modulation code; 2D ISI problem; interference suppression; modulation coding; intersymbol interference; high-density storage systems; two-dimensional modulation code; 2D intersymbol interference elimination; 2D magnetic recording; next generation data-storage systems; intertrack interference; magnetic recording; bit-patterned media recording; holographic data storage; 2D modulation code; quality assessment; area-density; adjacent tracks; 1D ISI; two-dimensional intersymbol interference; BPMR system
• ISSN: 1751-8628; 1751-8636; 1751-8636
• DOI: 10.1049/iet-com.2016.0200

This study presents a 9/12 two-dimensional (2D) modulation code 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), and 2D 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 proposed modulation code 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 proposed modulation code, a simulation model is carried out in a BPMR system. The results show that the proposed modulation code offers a gain of ∼2 dB over that of a system without encoding. In particular, a gain of ∼1 dB is obtained over that of a 6/8 modulation code regarding the same code rate.