Asymmetric Iterative Multi-Track Detection for 2-D Non-Binary LDPC-Coded Magnetic Recording

作者：Han, Guojun^*; Guan, Yong Liang; Cai, Kui; Chan, Kheong Sann

来源：IEEE Transactions on Magnetics, 2013, 49(10): 5215-5221.

DOI：10.1109/TMAG.2013.2262293

• Bit-patterned media recording (BPMR)
• inter-track interference (ITI)
• multi-track detection
• non-binary low-density parity-check (NB-LDPC) codes

Inter-track interference (ITI) is a major source of signal impairment in the next-generation magnetic recording 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 paper 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.

• 出版日期2013-10
• 单位广东工业大学; 南阳理工学院