Refinements of multi-track Viterbi bit-detection

A.P. Hekstra, W.M.J. Coene, A.H.J. Immink

Research output: Contribution to journalArticleAcademicpeer-review

6 Citations (Scopus)
139 Downloads (Pure)


In optical storage, data can be arranged on the disc in a meta-spiral consisting of a large number of bit-rows with a small track-pitch. Successive revolutions of the meta-spiral are separated by a narrow guard band. For high storage densities, such a system results in severe 2-D inter-symbol interference. In the multi-track Viterbi algorithm (MVA) of Krishnamoorthi and Weeks, the complex problem of 2-D bit-detection is broken down into a number of smaller bit-detection problems on sets of adjacent bit-rows called stripes. We improve the bit error rate (bER) performance of such a 2-D bit-detector via a number of measures such as: 1) weighing of the separate contributions to the branch metrics from each bit-row in a stripe and 2) inclusion of an additional contribution to the branch metrics from a bit-row adjacent to a stripe. In addition, we reduce the computational complexity by varying the number of bit-rows per stripe during successive iterations of the MVA, and through the use of local sequence feedback.
Original languageEnglish
Pages (from-to)3333-3339
Number of pages7
JournalIEEE Transactions on Magnetics
Issue number7
Publication statusPublished - 2006


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