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• W2963670004 abstract "We prove new lower bounds on the encoding length of Matching Vector (MV) codes. These recently discovered families of Locally Decodable Codes (LDCs) originate in the works of Yekhanin [Yek08] and Efremenko [Efr09] and are the only known families of LDCs with a constant number of queries and sub-exponential encoding length. The systematic study of these codes, and their limitations, was initiated in [DGY11] where quasi-linear lower bounds were proved on their encoding length. Our work makes another step in this direction by proving two new lower bounds. The first is an unconditional quadratic lower bound, conjectured in [DGY11], which is the first bound to exceed the known lower bounds for general constant-query LDCs (when the number of queries is greater than four). The second result is a conditional super-polynomial lower bound for constant-query MV codes, assuming a well-known conjecture in additive combinatorics – the Polynomial Freiman Rusza conjecture (over Znm). At the heart of MV codes are families of vectors in Zm with restricted inner products modulo m. More precisely, families U = (u1, . . . , ut), V = (v1, . . . , vt) with ui, vj ∈ Znm such that 〈ui, vi〉 = 0 mod m for all i ∈ [t] and 〈ui, uj〉 6= 0 mod m for i 6= j. Our lower bounds for MV codes are obtained by improving the known upper bounds on such families – a question that arises independently in combinatorics in the context of set systems with restricted modular intersections. In the course of our proofs we develop certain tools for working with matrices over Zm that might be of independent interest. Department of Computer Science. University of Texas at Austin. Email: bhowmick@cs.utexas.edu. Research done while the author was a visiting student at Princeton University. Research supported by NSF grant CCF-0916160. Department of Computer Science and Department of Mathematics, Princeton University, Princeton NJ. Email: zeev.dvir@gmail.com. Research partially supported by NSF grant CCF-0832797 and by the Packard fellowship. School of Mathematics, Institute for Advanced Study, Princeton, NJ. Email: slovett@math.ias.edu. Research supported by NSF grant DMS-0835373." @default.
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• W2963670004 date "2012-01-01" @default.
• W2963670004 modified "2023-10-18" @default.
• W2963670004 title "New Lower Bounds for Matching Vector Codes" @default.
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