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Aiming at further increasing the data-storage density beyond 1Tb/in2[1–3], bit-patterned media recording (BPMR), shingled writing (SW)/two-dimensional magnetic recording (TDMR) have emerged as new promising technologies.
Two dimensional (2-D) inter-symbol-interference (ISI), consisting of ISI in the down track direction and inter-track interference (ITI) along the cross-track direction, is a major factor that severely degrades the performance of ultra-high density magnetic recording systems.
Bit Patterned media recording (BPMR), heat assisted magnetic recording (HAMR), and shingled writing (SMR) with 2-dimensional (2-D) readback have been explored to further scale magnetic recording areal density over the next decade. However, from a signal processing perspective, all these magnetic recording technologies face a common challenge that is how to efficiently recover recorded data from the...
Bit-patterned media recording (BPMR), heat (or microwave) assisted magnetic recording (HAMR) and shingled writing (SW)/two-dimensional magnetic recording (TDMR) have been primed to further increase the areal density of magnetic recording beyond 1Tb/in2[1-3]. However, with the reduction of the track pitch, inter-track interference (ITI) becomes a major impairment for these magnetic recording systems...
This paper investigates the performance of the protograph based low-density parity-check (LDPC) codes for two dimensional (2D) inter symbol interference (ISI) channels with magnetic recording density. The protograph LDPC codes have been shown to possess excellent error performance over AWGN channel [1] and over partial response channel [2]. Moreover, the protograph structure that realizes linear encoding...
In this treatise, we propose an iteratively decoded Bell-labs LAyered Space-Time (BLAST) scheme, which serially concatenates an IRregular Convolutional Code (IRCC), a UnityRate Code (URC) and a BLAST transmitter. The proposed scheme is capable of achieving a near capacity performance with the aid of our Extrinsic Information Transfer (EXIT) chart assisted design procedure. Furthermore, a Markov Chain...
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