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- W2902185350 abstract "Synchronization strings are recently introduced by Haeupler and Shahrasbi [1] in the study of codes for correcting insertion and deletion errors (insdel codes). A synchronization string is an encoding of the indices of the symbols in a string, and together with an appropriate decoding algorithm it can transform insertion and deletion errors into standard symbol erasures and corruptions. This reduces the problem of constructing insdel codes to the problem of constructing standard error correcting codes, which is much better understood. Besides this, synchronization strings are also useful in other applications such as synchronization sequences and interactive coding schemes. For all such applications, synchronization strings are desired to be over alphabets that are as small as possible, since a larger alphabet size corresponds to more redundant information added.Haeupler and Shahrasbi [1] showed that for any parameter e > 0, synchronization strings of arbitrary length exist over an alphabet whose size depends only on e. Specifically, [1] obtained an alphabet size of O(e−4), which left an open question on where the minimal size of such alphabets lies between Ω(e-1) and O(e-4). In this work, we partially bridge this gap by providing an improved lower bound of Ω(e-3/2), and an improved upper bound of O (e-2). We also provide fast explicit constructions of synchronization strings over small alphabets.Further, along the lines of previous work on similar combinatorial objects, we study the extremal question of the smallest possible alphabet size over which synchronization strings can exist for some constant e" @default.
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- W2902185350 date "2019-01-06" @default.
- W2902185350 modified "2023-09-26" @default.
- W2902185350 title "Synchronization strings: highly efficient deterministic constructions over small alphabets" @default.
- W2902185350 doi "https://doi.org/10.5555/3310435.3310567" @default.
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