Reconstruction of finite rate of innovation signals in a noisy scenario: a robust, accurate estimation algorithm

The paradigmatic example of signals with finite rate of innovation (FRI) is a linear combination of a finite number of Diracs per time unit, a.k.a. spike sequence. Many researchers have investigated the problem of estimating the innovative part of a spike sequence, i.e., time instants t k s and weig...

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Published in:	Signal, image and video processing Vol. 14; no. 8; pp. 1707 - 1715
Main Authors:	Najjarzadeh, Meisam, Sadjedi, Hamed
Format:	Journal Article
Language:	English
Published:	London Springer London 01.11.2020 Springer Nature B.V
Subjects:	Algorithms Computer Imaging Computer Science Image Processing and Computer Vision Innovations Maximum likelihood estimation Multimedia Information Systems Noise Original Paper Parameter estimation Particle swarm optimization Pattern Recognition and Graphics Reconstruction Robustness (mathematics) Signal,Image and Speech Processing Spikes Vision Maximum likelihood estimation Modified particle swarm optimization Sampling and reconstruction Finite rate of innovation signals Spike sequence
ISSN:	1863-1703, 1863-1711
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Abstract	The paradigmatic example of signals with finite rate of innovation (FRI) is a linear combination of a finite number of Diracs per time unit, a.k.a. spike sequence. Many researchers have investigated the problem of estimating the innovative part of a spike sequence, i.e., time instants t k s and weights c k s of Diracs and proposed various deterministic or stochastic algorithms, particularly while the samples were corrupted by digital noise. In the presence of noise, maximum likelihood estimation method proved to be a powerful tool for reconstructing FRI signals, which is inherently an optimization problem. Wein and Srinivasan presented an algorithm, namely IterML, for reconstruction of streams of Diracs in noisy situations, which achieved promising reconstruction error and runtime. However, IterML is prone to limited resolution of search grid for t k , so as to avoid a phenomenon known as the curse of dimensionality, that makes it an inappropriate algorithm for applications that require highly accurate reconstruction of time instants. In order to overcome this shortcoming, we introduce a novel modified local best particle swarm optimization (MLBPSO) algorithm aimed at maximizing likelihood estimation of innovative parameters of a sparse spike sequence given noisy low-pass filtered samples. We demonstrate via extensive simulations that MLBPSO algorithm outperforms the IterML in terms of robustness to noise and accuracy of estimated parameters while maintaining comparable computational cost.
AbstractList	The paradigmatic example of signals with finite rate of innovation (FRI) is a linear combination of a finite number of Diracs per time unit, a.k.a. spike sequence. Many researchers have investigated the problem of estimating the innovative part of a spike sequence, i.e., time instants t k s and weights c k s of Diracs and proposed various deterministic or stochastic algorithms, particularly while the samples were corrupted by digital noise. In the presence of noise, maximum likelihood estimation method proved to be a powerful tool for reconstructing FRI signals, which is inherently an optimization problem. Wein and Srinivasan presented an algorithm, namely IterML, for reconstruction of streams of Diracs in noisy situations, which achieved promising reconstruction error and runtime. However, IterML is prone to limited resolution of search grid for t k , so as to avoid a phenomenon known as the curse of dimensionality, that makes it an inappropriate algorithm for applications that require highly accurate reconstruction of time instants. In order to overcome this shortcoming, we introduce a novel modified local best particle swarm optimization (MLBPSO) algorithm aimed at maximizing likelihood estimation of innovative parameters of a sparse spike sequence given noisy low-pass filtered samples. We demonstrate via extensive simulations that MLBPSO algorithm outperforms the IterML in terms of robustness to noise and accuracy of estimated parameters while maintaining comparable computational cost. The paradigmatic example of signals with finite rate of innovation (FRI) is a linear combination of a finite number of Diracs per time unit, a.k.a. spike sequence. Many researchers have investigated the problem of estimating the innovative part of a spike sequence, i.e., time instants tks and weights cks of Diracs and proposed various deterministic or stochastic algorithms, particularly while the samples were corrupted by digital noise. In the presence of noise, maximum likelihood estimation method proved to be a powerful tool for reconstructing FRI signals, which is inherently an optimization problem. Wein and Srinivasan presented an algorithm, namely IterML, for reconstruction of streams of Diracs in noisy situations, which achieved promising reconstruction error and runtime. However, IterML is prone to limited resolution of search grid for tk, so as to avoid a phenomenon known as the curse of dimensionality, that makes it an inappropriate algorithm for applications that require highly accurate reconstruction of time instants. In order to overcome this shortcoming, we introduce a novel modified local best particle swarm optimization (MLBPSO) algorithm aimed at maximizing likelihood estimation of innovative parameters of a sparse spike sequence given noisy low-pass filtered samples. We demonstrate via extensive simulations that MLBPSO algorithm outperforms the IterML in terms of robustness to noise and accuracy of estimated parameters while maintaining comparable computational cost.
Author	Najjarzadeh, Meisam Sadjedi, Hamed
Author_xml	– sequence: 1 givenname: Meisam surname: Najjarzadeh fullname: Najjarzadeh, Meisam organization: Department of Electrical Engineering, Shahed University, Acoustic Research Laboratory, Shahed University – sequence: 2 givenname: Hamed surname: Sadjedi fullname: Sadjedi, Hamed email: sadjedi@shahed.ac.ir organization: Department of Electrical Engineering, Shahed University, Acoustic Research Laboratory, Shahed University
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SubjectTerms	Algorithms Computer Imaging Computer Science Image Processing and Computer Vision Innovations Maximum likelihood estimation Multimedia Information Systems Noise Original Paper Parameter estimation Particle swarm optimization Pattern Recognition and Graphics Reconstruction Robustness (mathematics) Signal,Image and Speech Processing Spikes Vision
Title	Reconstruction of finite rate of innovation signals in a noisy scenario: a robust, accurate estimation algorithm
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