Folding Viterbi detector with reduced complexity for EPRML system applications

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Folding Viterbi detector with reduced complexity for EPRML system applications

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A folding Viterbi detector (FVD) is proposed, which has the usual state transition diagram folded with inverted states. Since most trellis-coded signals have symmetrical transition diagrams, if folded appropriately, branch metrics will appear when an add or subtract operation is carried out. In this scheme, one adder/subtractor replaces two adders. Compared with the EPR4 GVA detector, which requires eight adders, the proposed FVD requires only five adder/subtractors and the total gate count is reduced by 38% without BER performance degradation.

Inspec keywords: magnetic disc storage; maximum likelihood detection; partial response channels; Viterbi detection; digital magnetic recording

Other keywords: adder/subtracter; branch metrics; symmetrical transition diagrams; folding Viterbi detector; extended PRML system; inverted states; high density recording systems; state transition diagram; trellis-coded signals; BER performance; EPRML system applications; complexity reduction

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

References

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      • H.K. Thapar , A.M. Patel . A class of partial response systems for increasing storage density inmagnetic recording. IEEE Trans. Magn. , 5 , 3666 - 3668
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