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Optimization of coding and PRML detection scheme for perpendicular magnetic recording systems  

Lee Joo hyun (동국대학교 전자공학과 통신 및 정보저장연구실)
Lee Jae jin (동국대하교 통신 및 정보저장연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.30, no.3C, 2005 , pp. 59-63 More about this Journal
Abstract
We propose non-DC-free generalized PRML (GPRML) that are suppressed DC contents for matching to the response of perpendicular magnetic recording channel with a ring-head. In addition, DC-free encoding is considered to prevent low-frequency disturbances. The SNR performance is obtained by combining the various PRML channels with DC-free and non-DC-free codes during the normalized recording density increases from 2.5 to 3.5. The GPRML detections without using DC-free code get SNR gains more than 1dB compared to the conventional PRML systems at 10/sup -5/BER. We confirmed that the rate 127/136 DC-free coded GPRML systems show good performances compared with the 16/17 non-DC-free coded GPRML systems. In results, DC-free coded GPRML detections get gains about 1.4dB and 2.0dB at the density of 3.3 and 3.5, respectively.
Keywords
Modulation coding; PRML; perpendicular magnetic recording; DC-free coding; SNR;
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Times Cited By KSCI : 1  (Citation Analysis)
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