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arXiv 2010.07596math.STstat.TH
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较高噪声导致较小错误的隐马尔可夫模型

Hidden Markov Model Where Higher Noise Makes Smaller Errors

Yury A. Kutoyants

摘要:

考虑状态方程和观测方程中含有小噪声的部分可观测线性高斯系统的参数估计问题。我们描述的渐近性质的极大似然估计和贝叶斯估计的设置状态和观测噪声可能不平等的强度。证明了这两种估计是相合的、渐近正态的、有收敛矩的和渐近有效的。该模型具有一个特殊的功能:状态方程中噪声越大,估计误差越小。证明是基于卡尔曼-布西滤波器和相关的Riccati方程的渐近分析。

英文摘要:

We consider the problem of parameter estimation in a partially observed linear Gaussian system with small noises in the state and observation equations. We describe asymptotic properties of the MLE and Bayes estimators in the setting with state and observation noises of possibly unequal intensities. It is shown that both estimators are consistent, asymptotically normal with convergent moments and asymptotically efficient. This model has an unusual feature: larger noise in the state equation yields smaller estimation error. The proofs are based on asymptotic analysis of the Kalman-Bucy filter and the associated Riccati equation in particular.

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