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Minimax interpolation of continuous time stochastic processes with periodically correlated increments observed with noise
Maksym Luz, Mikhail Moklyachuk · 2023-07-06 · via math.ST updates on arXiv.org

We deal with the problem of optimal estimation of the linear functionals constructed from the missed values of a continuous time stochastic process $ξ(t)$ with periodically stationary increments at points $t\in[0;(N+1)T]$ based on observations of this process with periodically stationary noise. To solve the problem, a sequence of stochastic functions $ \{ξ^{(d)}_j(u)=ξ^{(d)}_j(u+jT,τ),\,\, u\in [0,T), j\in\mathbb Z\}. $ is constructed. It forms a $L_2([0,T);H)$-valued stationary increment sequence $\{ξ^{(d)}_j,j\in\mathbb Z\}$ or corresponding to it an (infinite dimensional) vector stationary increment sequence $\{\vecξ^{(d)}_j=(ξ^{(d)}_{kj}, k=1,2,\dots)^{\top}, j\in\mathbb Z\}$. In the case of a known spectral density, we obtain formulas for calculating values of the mean square errors and the spectral characteristics of the optimal estimates of the functionals. Formulas determining the least favorable spectral densities and the minimax (robust) spectral characteristics of the optimal linear estimates of functionals are derived in the case where the sets of admissible spectral densities are given.

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