A Study of Channel Time-Domain Response on Equalization for Reproducing a Double-Layer Magnetic Recording Medium
- Resource Type
- Periodical
- Authors
- Nakamura, Y.; Nishikawa, M.; Kanai, Y.; Okamoto, Y.
- Source
- IEEE Transactions on Magnetics IEEE Trans. Magn. Magnetics, IEEE Transactions on. 58(4):1-5 Apr, 2022
- Subject
- Fields, Waves and Electromagnetics
Magnetic recording
Signal to noise ratio
Magnetic heads
Sensitivity
Three-dimensional displays
Finite impulse response filters
Viterbi algorithm
3-D magnetic recording
equalization
multiple recording layer medium
signal processing
- Language
- ISSN
- 0018-9464
1941-0069
To increase the recording density of hard disk drives (HDD), 3-D magnetic recording using microwave-assisted magnetic recording (MAMR) with multiple recording layers is attracting much attention as a next-generation recording method. Developing a signal processing method for 3-D magnetic recording using the multiple conventional recording layers and an magnetoresistive (MR) head reading system is desired. In this article, we evaluate 2-D partial response maximum likelihood (PRML) channels by the bit error rate (BER) performance, where the transfer function of the PR channel is determined by the response of the in-phase or differential-phase bits between layers in a double-layer magnetic recording medium. The results show that a BER of $10^{-4}$ can be achieved by the PRML channel determined by the differential-phase response with the signal-to-noise ratio (SNR) greater than 26.0 dB for system noise.