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    On the power of relaxed Local Decoding Algorithms

    Lachish, Oded and Gur, T. (2021) On the power of relaxed Local Decoding Algorithms. SIAM Journal on Computing 50 (2), pp. 788-813. ISSN 0097-5397.

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    Abstract

    A locally decodable code (LDC) C from {0,1} to the k to {0,1} to the n is an error correcting code wherein individual bits of the message can be recovered by only querying a few bits of a noisy codeword. LDCs found a myriad of applications both in theory and in practice, ranging from probabilistically checkable proofs to distributed storage. However, despite nearly two decades of extensive study, the best known constructions of O(1)-query LDCs have super-polynomial block length. The notion of relaxed LDCs is a natural relaxation of LDCs, which aims to bypass the foregoing barrier by requiring local decoding of nearly all individual message bits, yet allowing decoding failure (but not error) on the rest. State of the art constructions of O(1)-query relaxed LDCs achieve blocklength n is order of k to the power of 1 plus gamma for an arbitrarily small constant. We prove a lower bound which shows that O(1)-query relaxed LDCs cannot achieve blocklength n = k to the power of 1 + o(1). This resolves an open problem raised by Goldreich in 2004.

    Metadata

    Item Type: Article
    Keyword(s) / Subject(s): local decoding, algorithms, lower bounds
    School: School of Business, Economics & Informatics > Computer Science and Information Systems
    Depositing User: Oded Lachish
    Date Deposited: 08 Jun 2021 12:11
    Last Modified: 12 Jun 2021 13:32
    URI: https://eprints.bbk.ac.uk/id/eprint/44619

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