Analysis and design of irregular graphs for node-based verification-based recovery algorithms in compressed sensing

In this paper, we present a probabilistic analysis of iterative node-based verification-based (NB-VB) recovery algorithms over irregular graphs in the context of compressed sensing. Verification-based algorithms are particularly interesting due to their low complexity (linear in the signal dimension...

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Veröffentlicht in:2012 IEEE International Symposium on Information Theory Proceedings S. 1872 - 1876
Hauptverfasser: Eftekhari, Y., Banihashemi, A. H., Lambadaris, I.
Format: Tagungsbericht
Sprache:Englisch
Veröffentlicht: IEEE 01.07.2012
Schlagworte:
Algorithm design and analysis
Complexity theory
Compressed sensing
Noise measurement
Sensors
Sparse matrices
Vectors
ISBN:9781467325806, 1467325805
ISSN:2157-8095
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Zusammenfassung:In this paper, we present a probabilistic analysis of iterative node-based verification-based (NB-VB) recovery algorithms over irregular graphs in the context of compressed sensing. Verification-based algorithms are particularly interesting due to their low complexity (linear in the signal dimension n). The analysis predicts the average fraction of unverified signal elements at each iteration ℓ where the average is taken over the ensembles of input signals and sensing matrices. The analysis is asymptotic (n → ∞) and is similar in nature to the well-known density evolution technique commonly used to analyze iterative decoding algorithms. Compared to the existing technique for the analysis of NB-VB algorithms, which is based on numerically solving a large system of coupled differential equations, the proposed method is much simpler and more accurate. This allows us to design irregular sensing graphs for such recovery algorithms. The designed irregular graphs outperform the corresponding regular graphs substantially. For example, for the same recovery complexity per iteration, we design irregular graphs that can recover up to about 40% more non-zero signal elements compared to the regular graphs. Simulation results are also provided which demonstrate that the proposed asymptotic analysis matches the performance of recovery algorithms for large but finite values of n.
ISBN:9781467325806
1467325805
ISSN:2157-8095
DOI:10.1109/ISIT.2012.6281807