Robust Modulation of PWM-Based Multi-Level Perpendicular Magnetic Recording for Conventional Media - 2018


During this letter, we propose a sturdy 3-ary modulation for a pulse width modulation (PWM)-based mostly multi-level perpendicular magnetic recording. In the proposed three-ary modulation, slim-width pulses are restrained in PWM signal equivalent to resolution of magnetic media. We have a tendency to evaluate a user bit density (UBD) gain in our proposal using a low-density parity-check (LDPC) coded frame error rate performance. An occasional-resolution media is assumed as scan/write (R/W) channel within the evaluation. Our simulation results show the proposed modulation has strong UBD gain compared with the traditional binary R/W systems within the low-resolution media. Similarly, our proposed 7B6T modulation with non-binary LDPC codes over GF(128) has more than 6percent density gain from the practical binary systems.

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