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• W2609924459 abstract "Particle filters are a popular and flexible class of numerical algorithms to solve a large class of nonlinear filtering problems. However, standard particle filters with importance weights have been shown to require a sample size that increases exponentially with the dimension $D$ of the state space in order to achieve a certain performance, which precludes their use in very high-dimensional filtering problems. Here, we focus on the dynamic aspect of this “curse of dimensionality” (COD) in continuous-time filtering, which is caused by the degeneracy of importance weights over time. We show that the degeneracy occurs on a time scale that decreases with increasing $D$. In order to soften the effects of weight degeneracy, most particle filters use particle resampling and improved proposal functions for the particle motion. We explain why neither of the two can prevent the COD in general. In order to address this fundamental problem, we investigate an existing filtering algorithm based on optimal feedback control that sidesteps the use of importance weights. We use numerical experiments to show that this feedback particle filter (FPF) by [T. Yang, P. G. Mehta, and S. P. Meyn, IEEE Trans. Automat. Control, 58 (2013), pp. 2465--2480] does not exhibit a COD." @default.
• W2609924459 created "2017-05-05" @default.
• W2609924459 creator A5027596786 @default.
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• W2609924459 date "2019-01-01" @default.
• W2609924459 modified "2023-10-10" @default.
• W2609924459 title "How to Avoid the Curse of Dimensionality: Scalability of Particle Filters with and without Importance Weights" @default.
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• W2609924459 doi "https://doi.org/10.1137/17m1125340" @default.
• W2609924459 hasPublicationYear "2019" @default.
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