Low complexity viterbi detector for magnetic disc drives

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Low complexity viterbi detector for magnetic disc drives

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© The Institution of Electrical Engineers
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A signal detection scheme for magnetic disc drives based on maximum likelihood sequence detection is proposed which refers to a channel with RLL 1, 7 coding and features a trellis with three states and five transitions. Owing to the RLL 1, 7 code, clock recovery is more stable than in partial response coded systems. The decoding gain amounts to 5 dB, and may lead to an increase in capacity by a factor of 1.8 when used for reading narrower tracks.

Inspec keywords: magnetic disc storage; encoding; maximum likelihood estimation; decoding; signal detection

Other keywords: decoding gain; partial response coded systems; magnetic disc drives; RLL 1, 7 coding; maximum likelihood sequence detection; 5 dB; clock recovery

Subjects: Storage on moving magnetic media; Information theory; Magnetic recording; Signal processing and detection

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