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With the development of manufacture technology, the multi-level cell (MLC) technique dramatically increases the storage density of NAND flash memory. As the result, cell-to-cell interference (CCI) becomes more serious and hence causes an increase in the raw bit error rate of data stored in the cells. Recently, low-density parity-check (LDPC) codes have appeared to be a promising solution to combat...
Multi-level per cell (MLC) /Triple-Level per cell (TLC) technique significantly improves storage density with low cost increases, which stores more than one bit per cell, but also drastically decreases reliability in NAND flash memory. As the bit number per cell increases, correspondingly cell-to-cell interference (CCI) becomes the major challenge for NAND flash memory technology scaling. Recently,...
With continued scaling down of the NAND flash memory, the multi-level cell (MLC) technique emerges to dramatically increase the storage density. Meanwhile, this technique also leads to worse error performance owing to the cell-to-cell interference (CCI). Recently, low-density parity-check (LDPC) code has appeared to be a promising solution to combat the performance degradation of NAND flash memory...
In this paper, we consider the protograph low-density parity-check (LDPC) codes in two-dimensional inter two-dimensional (2D) intersymbol interference (ISI) channels, which are widely used in modeling ultra-high-density magnetic recoding systems. In particular, we study the convergence and error performance of protograph codes over 2D-ISI channels. We modify the finite-length (FL) extrinsic information...
In wireless communications, spatial diversity techniques, such as space-time block code (STBC) and multiple-input multiple-output (MIMO), have attracted much attention in recent years because they possess powerful robustness against signal fading. In this paper, we investigate the performance of the protograph low-density parity-check (LDPC) codes over space-time block code (STBC) Rayleigh fading...
In this paper, we investigate the performance of the protograph low-density parity-check (LDPC) codes concatenated with space-time block code (STBC) over Rayleigh fading channels. We firstly extend the modified protograph extrinsic information transfer (PEXIT) algorithm in order to analyze the convergence performance of protograph codes. Based on the extended PEXIT algorithm and Gaussian approximation,...
New magnetic recording technologies such as bit-patterned media recording (BPMR), heat (or microwave) assisted magnetic recording (HAMR) and shingled writing (SW)/two-dimensional magnetic recording (TDMR) have been proposed to push the storage density of future hard disks beyond 1Tb/in2. However, at such high recording density, many new challenges from the magnetic recording medium, read/write head...
We propose a class of rate-compatible (RC) low-density parity-check (LDPC) codes that has linear encoding complexity and low error floor. To ensure linear encoding, a deterministic form for the parity part of the mother parity-check matrix is used. To guarantee good performances in the waterfall region for a wide range of code rates, a layered density evolution algorithm is developed to obtain the...
An algorithm based on the fitting of modified Extrinsic Information Transfer (EXIT) chart is proposed to calculate the thresholds of low-density parity-check (LDPC) codes optimized for the two-dimensional (2D) intersymbol interference (ISI) channels encountered in high-density magnetic recording, such as bit-patterned magnetic recording (BPMR) and two-dimensional magnetic recording (TDMR). The modified...
Optimization of low-density parity-check (LDPC) codes to two dimensional (2D) intersymbol interference (ISI) channels is proposed, which exploits the modified Extrinsic Information Transfer (EXIT) chart. Specifically, a new degree optimization through EXIT chart fitting is proposed, where optimal variable node degree is search by selecting the best regular check node degree to match the check node...
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