A sparse fast Fourier algorithm for real non-negative vectors
A sparse fast Fourier algorithm for real non-negative vectors
复制标题
实数非负向量的稀疏快速傅立叶算法
DOI:
10.1016/j.cam.2017.03.019
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发表时间:
2017
期刊:
影响因子:
--
通讯作者:
Katrin Wannenwetsch
中科院分区:
文献类型:
--
作者:
Gerlind Plonka;Katrin Wannenwetsch
In this paper we propose a new fast Fourier transform to recover a real non-negative signal x∈ R+ N from its discrete Fourier transform x ̂= F N x∈ C N. If the signal x appears to have a short support, ie, vanishes outside a support interval of length m< N, then the algorithm has an arithmetical complexity of only O (m log m log (N/m)) and requires O (m log (N/m)) Fourier samples for this computation. In contrast to other approaches there is no a priori knowledge needed about sparsity or support bounds for the vector x. The algorithm automatically recognizes and exploits a possible short support of the vector and falls back to a usual radix-2 FFT algorithm if x has (almost) full support. The numerical stability of the proposed algorithm is shown by numerical examples.
影响因子:
2.5
作者:
Adi Akavia
通讯作者:
Adi Akavia
DOI:
--
发表时间:
1973
期刊:
JACM
影响因子:
--
作者:
Jacques Morgenstern
通讯作者:
Jacques Morgenstern