SIGNAL-TO-NOISE RATIO DEGRADATION WITH CHANNEL MISMATCH

Sensitivities of different run-length-limited coding and equalization/detection schemes to channel response variations have been investigated. Channel variations considered here are due to the head-medium velocity variations and head-medium spacing fluctuations, reflected in the height and width changes in the read pulse. Given equalizers/detectors are first tuned to a specific value of PW50, the half-height width of the read pulse. Then, the signal-to-noise ratio degradation is observed as the actual PW50 is varied around this nominal value. The results show that the sensitivity varies widely across different detectors. For example, the partial response maximum likelihood (PRML) schemes, which achieve large performance advantages over peak detection under ideal conditions, are highly sensitive to channel variations and perform worse than peak detection as the PW50 mismatch becomes large. On the other hand, the recently introduced fixed-delay tree search with decision feedback (FDTS/DF) exhibits good resistance to channel variations while achieving favorable nominal performance.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
1991-11
Language
ENG
Citation

IEEE TRANSACTIONS ON MAGNETICS, v.27, no.6, pp.4837 - 4839

ISSN
0018-9464
DOI
10.1109/20.278963
URI
http://hdl.handle.net/10203/66039
Appears in Collection
EE-Journal Papers(저널논문)
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