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Proceedings Paper

Nonlinear signal model for magnetic-tape recording channels utilizing magneto-resistive heads
Author(s): Gregory L. Silvus; Bhagavatula Vijaya Kumar
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Paper Abstract

As bit and track densities increase, more complex detection schemes must be devised to combat the nonlinearities inherent in high-density magnetic-recording channels. With an accurate model we can quantify the departure of the channel from linear superposition, leading to optimized detectors providing improved system performance. Two distinct models have been developed. The first attempts to account for many nonlinear effects created by the physical properties of the medium; the other tries to combine all of these effects into a simple nonlinear function. Both models show excellent agreement using parameters derived from experimental signals. Simpler detection schemes result from the second model, while the first, more complex, model ensures preservation of generality. Apart from devising nonlinear detectors, we can also generate pseudo-random signals with enhanced nonlinear distortions, which may be used to test the robustness of various detection schemes. In this paper we present the results of parameter extraction and nonlinear distortion for several magneto- resistive tape-recording channels at a wide range of densities.

Paper Details

Date Published: 15 January 1996
PDF: 8 pages
Proc. SPIE 2604, High-Density Data Recording and Retrieval Technologies, (15 January 1996); doi: 10.1117/12.230056
Show Author Affiliations
Gregory L. Silvus, Carnegie Mellon Univ. (United States)
Bhagavatula Vijaya Kumar, Carnegie Mellon Univ. (United States)


Published in SPIE Proceedings Vol. 2604:
High-Density Data Recording and Retrieval Technologies
Ted A. Schwarz; Martin Francis, Editor(s)

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