Estimation of a Noisy Discrete-Time Step Function: Bayes and Empirical Bayes Approaches
含噪离散时间阶梯函数的贝叶斯与经验贝叶斯估计AI 解读 ↓
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含噪离散时间阶梯函数的贝叶斯与经验贝叶斯估计AI 解读 ↓
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Consider the problem of estimating, in a Bayesian framework and in the presence of additive Gaussian noise, a signal which is a step function. Best linear estimates and Bayes estimates are derived, evaluated and compared. A characterization of the Bayes estimates is presented. This characterization has an intuitive interpretation and also provides a way to compute the Bayes estimates with a number of operations of the order of $T^3$ where $T$ is the fixed time span. An approximation to the Bayes estimates is proposed which reduces the total number of operations to the order of $T$. The results are applied to the case where the Bayesian model fails to be satisfied using an empirical Bayes approach.