Sparse signals recovered by non-convex penalty in quasi-linear systems
The goal of compressed sensing is to reconstruct a sparse signal under a few linear measurements far less than the dimension of the ambient space of the signal. However, many real-life applications in physics and biomedical sciences carry some strongly nonlinear structures, and the linear model is n...
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| Vydáno v: | Journal of inequalities and applications Ročník 2018; číslo 1; s. 59 - 11 |
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| Hlavní autoři: | , , , |
| Médium: | Journal Article |
| Jazyk: | angličtina |
| Vydáno: |
Cham
Springer International Publishing
2018
SpringerOpen |
| Témata: | |
| ISSN: | 1029-242X, 1025-5834, 1029-242X |
| On-line přístup: | Získat plný text |
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| Shrnutí: | The goal of compressed sensing is to reconstruct a sparse signal under a few linear measurements far less than the dimension of the ambient space of the signal. However, many real-life applications in physics and biomedical sciences carry some strongly nonlinear structures, and the linear model is no longer suitable. Compared with the compressed sensing under the linear circumstance, this nonlinear compressed sensing is much more difficult, in fact also NP-hard, combinatorial problem, because of the discrete and discontinuous nature of the
ℓ
0
-norm and the nonlinearity. In order to get a convenience for sparse signal recovery, we set the nonlinear models have a smooth quasi-linear nature in this paper, and study a non-convex fraction function
ρ
a
in this quasi-linear compressed sensing. We propose an iterative fraction thresholding algorithm to solve the regularization problem
(
Q
P
a
λ
)
for all
a
>
0
. With the change of parameter
a
>
0
, our algorithm could get a promising result, which is one of the advantages for our algorithm compared with some state-of-art algorithms. Numerical experiments show that our method performs much better than some state-of-the-art methods. |
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| Bibliografie: | ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23 |
| ISSN: | 1029-242X 1025-5834 1029-242X |
| DOI: | 10.1186/s13660-018-1652-8 |