Title: 2-D Coding and Multi-Track Detection for High Density Magnetic Recording Channel with 2-D ISI

Speaker：韩国军

Date: 11^th December 15:00-16:00

Venue: 海韵教学楼504

讲座人简历：韩国军广东工业大学副教授，硕士生导师，IEEE高级会员。分别于1997年在哈尔滨理工大学获得工学学士学位，2003年在华南理工大学获得工学硕士学位，2011年在中山大学获得理学博士学位。2011年7月-2013年8月在新加坡南洋理工大学从事博士后研究工作，2013年10月-2014年4月在香港科技大学进行访问交流。拥有在企业从事磁存储与光电显示产品的开发经验。目前主要从事面向高密度磁存储、新型半导体存储的差错控制编码与信号处理技术的研究，以及车联网技术的研发。在IEEE Transactions on Communications、IEEE Transactions on Magnetics、IEEE Communications Letters期刊发表研究论文11篇。主持国家自然科学基金面上项目两项，参与国家、省部科研项目多项。

Abstract:

Bit-Patterned media recording (BPMR), heat (or microwave) assisted magnetic recording (HAMR), and shingled writing (SW)/two-dimensional magnetic recording (TDMR) have been explored to further increase the areal density of magnetic recording. However, with the reduction of the track pitch, the inter-track interference (ITI) has become a major impairment for these magnetic recording systems. The ITI combined with the down-track inter-symbol interference (ISI) forms a two-dimensional (2-D) interference which severely degrades the performance of channel detection in these systems.

The single track read channel model, combined with anti-ITI signal detection schemes, is a popular way to recover single-track data from a readback signal corrupted by the ITI. On the other hand, the multi-track read channel model can be used to simultaneously recover multi-track data from a readback signal. However, the performance of multi-track detection is severely degraded by the weak signals from the sidetracks and the indistinguishable symbols. To improve this performance, in this study we propose a two-dimensional coding in conjunction with an asymmetric iterative multi-track detection (A-IMD) scheme, which uses joint channel detection and decoding of two parallel six-symbol-based detectors concatenated with two parallel non-binary low-density parity-check (NB-LDPC) decoder over GF(4), to iteratively recover four-track data from two readback signals. Simulation results demonstrate that the performance of the multi-track detection can indeed be greatly improved by using the proposed A-IMD scheme.