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  4. What’s the Frequency, Kenneth?: Sublinear Fourier Sampling Off the Grid
 
research article

What’s the Frequency, Kenneth?: Sublinear Fourier Sampling Off the Grid

Boufounos, Petros
•
Cevher, Volkan  orcid-logo
•
Gilbert, Anna C.
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2015
Algorithmica

We design a sublinear Fourier sampling algorithm for a case of sparse off-grid frequency recovery. These are signals with the form f(t)=∑kj=1ajeiωjt+ν^ , t∈Z ; i.e., exponential polynomials with a noise term. The frequencies {ω j } satisfy ω j  ∈ [η,2π − η] and min i ≠ j |ω i  − ω j | ≥ η for some η > 0. We design a sublinear time randomized algorithm, which takes O(klogklog(1/η)(logk + log( ∥ a ∥ 1/ ∥ ν ∥ 1)) samples of f(t) and runs in time proportional to number of samples, recovering {ω j } and {a j } such that, with probability Ω(1), the approximation error satisfies |ω j ′ − ω j | ≤ η/k and |a j  − a j ′| ≤ ∥ ν ∥ 1/k for all j with |a j | ≥ ∥ ν ∥ 1/k.

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Type
research article
DOI
10.1007/s00453-014-9918-0
Web of Science ID

WOS:000360668100002

Author(s)
Boufounos, Petros
Cevher, Volkan  orcid-logo
Gilbert, Anna C.
Li, Yi
Strauss, Martin J.
Date Issued

2015

Publisher

Springer Verlag

Published in
Algorithmica
Volume

73

Issue

2

Start page

261

End page

288

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LIONS  
Available on Infoscience
January 22, 2015
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/110476
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