## Duke Mathematical Journal

### Explicit constructions of RIP matrices and related problems

#### Abstract

We give a new explicit construction of $n\times N$ matrices satisfying the Restricted Isometry Property (RIP). Namely, for some $\varepsilon>0$, large $N$, and any $n$ satisfying $N^{1-\varepsilon} \le n\le N$, we construct RIP matrices of order $k\ge n^{1/2+\varepsilon}$ and constant $\delta=n^{-\varepsilon}$. This overcomes the natural barrier $k=O(n^{1/2})$ 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 $1\le k\le N$ (Turán's power sum problem), which improves upon known explicit constructions when $({\rm log} N)^{1+o(1)} \le n\le ({\rm log} N)^{4+o(1)}$. This latter construction produces elementary explicit examples of $n \times N$ 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 $({\rm log} N)^{1+o(1)}\le n\le ({\rm log} N)^{5/2+o(1)}$.

#### Article information

Source
Duke Math. J., Volume 159, Number 1 (2011), 145-185.

Dates
First available in Project Euclid: 11 July 2011

https://projecteuclid.org/euclid.dmj/1310416365

Digital Object Identifier
doi:10.1215/00127094-1384809

Mathematical Reviews number (MathSciNet)
MR2817651

Zentralblatt MATH identifier
1236.94027

#### Citation

Bourgain, Jean; Dilworth, Stephen; Ford, Kevin; Konyagin, Sergei; Kutzarova, Denka. Explicit constructions of RIP matrices and related problems. Duke Math. J. 159 (2011), no. 1, 145--185. doi:10.1215/00127094-1384809. https://projecteuclid.org/euclid.dmj/1310416365

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