Explicit constructions of rip matrices and related problems

Jean Bourgain, Stephen Dilworth, Kevin Ford, Sergei Konyagin, Denka Kutzarova

Research output: Contribution to journalArticlepeer-review


We give a new explicit construction of n×N matrices satisfying the Restricted Isometry Property (RIP). Namely, for some ε>0,largeN, and any n satisfying N1-ε ≤ n ≤ N, we construct RIP matrices of order k ≥ n1/2+ε and constant δ = n. This overcomes the natural barrier k = O(n1/2) for proofs based on small coherence, which are used in all previous explicit constructions of RIP matrices. Key ingredients in our proof are new estimates for sumsets in product sets and for exponential sums with the products of sets possessing special additive structure. We also give a construction of sets of n complex numbers whose kth moments are uniformly small for 1 ≤ k ≤ N (Turán's power sum problem), which improves upon known explicit constructions when (log N)1+o(1) ≤ n ≤ (log N)4+o(1). This latter construction produces elementary explicit examples of n×N matrices that satisfy the RIP and whose columns constitute a new spherical code; for those problems the parameters closely match those of existing constructions in the range (log N)1+o(1) ≤ n ≤ (log N)5/2+o(1).

Original languageEnglish (US)
Pages (from-to)145-185
Number of pages41
JournalDuke Mathematical Journal
Issue number1
StatePublished - Jul 15 2011

ASJC Scopus subject areas

  • General Mathematics


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