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• W2609866607 abstract "We consider the problem of querying a string (or, a database) of length $N$ bits to determine all the locations where a substring (query) of length $M$ appears either exactly or is within a Hamming distance of $K$ from the query. We assume that sketches of the original signal can be computed off line and stored. Using the sparse Fourier transform computation based approach introduced by Pawar and Ramchandran, we show that all such matches can be determined with high probability in sub-linear time. Specifically, if the query length $M = O(N^mu)$ and the number of matches $L=O(N^lambda)$, we show that for $lambda < 1-mu$ all the matching positions can be determined with a probability that approaches 1 as $N rightarrow infty$ for $K leq frac{1}{6}M$. More importantly our scheme has a worst-case computational complexity that is only $Oleft(max{N^{1-mu}log^2 N, N^{mu+lambda}log N }right)$, which means we can recover all the matching positions in {it sub-linear} time for $lambda<1-mu$. This is a substantial improvement over the best known computational complexity of $Oleft(N^{1-0.359 mu} right)$ for recovering one matching position by Andoni {em et al.} cite{andoni2013shift}. Further, the number of Fourier transform coefficients that need to be computed, stored and accessed, i.e., the sketching complexity of this algorithm is only $Oleft(N^{1-mu}log Nright)$. Several extensions of the main theme are also discussed." @default.
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• W2609866607 date "2017-04-25" @default.
• W2609866607 modified "2023-09-27" @default.
• W2609866607 title "Sub-string/Pattern Matching in Sub-linear Time Using a Sparse Fourier Transform Approach." @default.
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