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Soft-Decision Algorithm of a Rate-5/6 2D Modulation Code for SHTR in Staggered BPMR Systems
Author(s)
Kanjanakunchorn, Chavisa
Date Issued
January 1, 2022
Type
Conference Paper
Abstract
With an increasing demand for recording data storage, this paper is interested in magnetic recording in bit-patterned media recording (BPMR) systems. The main problem of BPMR system from track width and bit length decreasing is two-dimensional (2-D) interference, consisting of inter-symbol interference and inter-track interference. One thing that solved this problem is 2-D modulation code of a rate-5/6 for single-head/two-track reading with staggered bit islands. Moreover, we also improve the performance of system by soft decision algorithm and low-density parity-check code because it can do an iterative process. The soft information is created by log-likelihood ratio by using a look-up table of a rate-5/6 through the Boolean logic circuit equation. After that, this soft information is brought to modified one-dimensional (1-D) soft-output Viterbi algorithm detector. At the same code rate of 5/6 and with bit error rate of 10-4, the simulation results show that our proposed scheme at an areal density of 3 Terabit per square inch, is better than system that performs without 2-D modulation code for 2 dB. Moreover, it is also better than previously proposed system that uses hard decisions with 2-D modulation code for 4 dB.
Citation
19th International Conference on Electrical Engineering Electronics Computer Telecommunications and Information Technology Ecti Con 2022, 2022