Novel multi-level magnetic recording using modern error correction.

Conference poster

Shah, P., Ahmed, M., Ambroze, M., Tjhai, C. and Davey, P. 2006. Novel multi-level magnetic recording using modern error correction. European Phase Change and Ovonic Symposium. Grenoble, France
TypeConference poster
TitleNovel multi-level magnetic recording using modern error correction.
AuthorsShah, P., Ahmed, M., Ambroze, M., Tjhai, C. and Davey, P.
Abstract

It has been shown that multilevel techniques operate closer to the channel capacity than binary for a bandwidth
limited channel experiencing Additive White Gaussian Noise (AWGN) at increased Signal to Noise Ratio (SNR)
[1]. Previous work[2] suggested that multi-level techniques, offered little, if any improvement of the magnetic recording capacity compared to the binary(two-level) system, and is eventually limited by amplitude irregularities in the magnetic channel. This paper looks at a new approach of applying powerful Error Correction Codes
(ECC) on the multi-level magnetic recording channel and investigating the improvement in the performance.
The main idea behind multilevel recording is to enable storing of more information bits per transition on
the magnetic medium. Several magnetisation levels could be used with the multi-level channel. It is known that at higher code rates for AWGN channels, binary codes tend to deviate very quickly from their theoretical performance[1]. In order to achieve very low error-rates at a particular SNR, it is necessary to use state of the art ECC like Turbo Codes. This paper examines the use of multilevel data in conjunction with Turbo codes, for a high density magnetic recording channel, to achieve increased channel capacity for a particular SNR in the operating region of the magnetic recording devices.

Research GroupSensoLab group
ConferenceEuropean Phase Change and Ovonic Symposium
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Print2006
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Deposited03 May 2011
Output statusPublished
LanguageEnglish
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Wright, C., Ashawaraya, P., Ashwin, P., Aziz, M., Hicken, R., Kohary, K., Liu, Y., Marmier, A., Shah, P., Vazquez, J. and Wang, L. 2010. Phase-change technologies: from PCRAM to probe-storage to processors. European Phase Change and Ovonic Conference. Milano 05 - 07 Sep 2010
The design of rewritable ultrahigh density scanning-probe phase-change memories
Wright, C., Wang, L., Shah, P., Aziz, M., Varesi, E., Bez, R., Moroni, M. and Cazzaniga, F. 2011. The design of rewritable ultrahigh density scanning-probe phase-change memories. IEEE Transactions on Nanotechnology. 10 (4), pp. 900-912. https://doi.org/10.1109/TNANO.2010.2089638
Ultra high density scanning electrical probe phase-change memory for archival storage
Wang, L., Wright, C., Shah, P., Aziz, M., Sebastian, A., Pozidis, H. and Pauza, A. 2011. Ultra high density scanning electrical probe phase-change memory for archival storage. Japanese Journal of Applied Physics. 50 (9S1), pp. 1-2. https://doi.org/10.1143/JJAP.50.09MD04
Scanning probe memories - Technology and applications
Wright, C., Aziz, M., Shah, P. and Wang, L. 2011. Scanning probe memories - Technology and applications. Current Applied Physics. 11 (2, Supplement), pp. e104-e109. https://doi.org/10.1016/j.cap.2010.11.130
Write strategies for multiterabit per square inch scanned-probe phase-change memories
Wright, C., Shah, P., Wang, L., Aziz, M., Sebastian, A. and Pozidis, H. 2010. Write strategies for multiterabit per square inch scanned-probe phase-change memories. Applied Physics Letters. 97 (17). https://doi.org/10.1063/1.3506584
Novel soft-feedback equalization method for multilevel magnetic recording
Shah, P., Ahmed, M., Ambroze, M., Tjhai, C. and Davey, P.J. 2007. Novel soft-feedback equalization method for multilevel magnetic recording. Tenth joint Magnetism and Magnetic Materials - International Magentics (MMM–INTERMAG) conference. Baltimore, Maryland, USA 07 - 11 Jan 2007 IEEE. https://doi.org/10.1109/TMAG.2007.894010