The Read Channel

In this paper, we provide a survey of the novel read channel technologies that found their implementation in products over the past decade, and we outline possible technology directions for the future of read channels. Recently, magnetic recording read channels have undergone several changes. In add...

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Bibliographic Details
Published in:Proceedings of the IEEE 2008-11, Vol.96 (11), p.1761-1774
Main Authors: Kavcic, Aleksandar, Patapoutian, Ara
Format: Article
Language:English
Subjects:
Autoregressive processes
Channels
codes
Coding
Decoding
Disk drives
error-correction coding
Information rates
information theory
Jitter
Kalman filtering
Magnetic recording
magnetic recording noise
Maximum likelihood detection
modeling
Pulse modulation
Readers
Recording
Reed-Solomon codes
Research and development
servosystems
signal processing
Switching
synchronization
Viterbi detection
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Summary:In this paper, we provide a survey of the novel read channel technologies that found their implementation in products over the past decade, and we outline possible technology directions for the future of read channels. Recently, magnetic recording read channels have undergone several changes. In addition to switching from longitudinal to perpendicular recording channels, detectors tuned to media noise sources are now readily implemented in read channel chips. Powerful numerical techniques have emerged to evaluate the capacity of the magnetic recording channel. Further, improved coding/decoding methods have surfaced both for the incumbent Reed-Solomon codes and the promising low-density parity-check codes. The paper is a tutorial-like survey of these emerging technologies with the aim to propel the reader to the forefront of research and development in the areas of signal processing and coding for magnetic recording channels.
ISSN:0018-9219
1558-2256
DOI:10.1109/JPROC.2008.2004310