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arXiv 2003.12405eess.SPcs.ITmath.ITstat.AP
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多假设下的贝叶斯序贯联合检测与估计

Bayesian Sequential Joint Detection and Estimation under Multiple Hypotheses

Dominik Reinhard, Michael Fauß, Abdelhak M. Zoubir

摘要:

我们考虑的问题,联合测试多个假设和估计的随机参数的基础分布。这个问题是在一个连续的设置下,温和的假设下的基本随机过程。最佳方法最小化期望的样本数,同时确保平均检测/估计误差不超过一定的水平。在将约束问题转化为无约束问题后,我们用一个非线性Bellman方程来描述一般解,该方程由一组代价系数来参数化。推导出了代价函数的导数与系数和顺序过程的检测/估计误差之间的强连接。基于这一基本性质,我们进一步表明,适当选择成本系数的约束和无约束问题的解决方案相吻合。我们提出了两种方法来找到最佳的系数。对于第一种方法,最终的优化问题被转换成一个线性规划,而第二种方法解决它与投影梯度上升。为了说明理论结果,我们考虑两个问题的最佳方案的数值设计。通过蒙特卡罗模拟,验证了数值结果与理论的一致性.

英文摘要:

We consider the problem of jointly testing multiple hypotheses and estimating a random parameter of the underlying distribution. This problem is investigated in a sequential setup under mild assumptions on the underlying random process. The optimal method minimizes the expected number of samples while ensuring that the average detection/estimation errors do not exceed a certain level. After converting the constrained problem to an unconstrained one, we characterize the general solution by a non-linear Bellman equation, which is parametrized by a set of cost coefficients. A strong connection between the derivatives of the cost function with respect to the coefficients and the detection/estimation errors of the sequential procedure is derived. Based on this fundamental property, we further show that for suitably chosen cost coefficients the solutions of the constrained and the unconstrained problem coincide. We present two approaches to finding the optimal coefficients. For the first approach, the final optimization problem is converted into a linear program, whereas the second approach solves it with a projected gradient ascent. To illustrate the theoretical results, we consider two problems for which the optimal schemes are designed numerically. Using Monte Carlo simulations, it is validated that the numerical results agree with the theory.

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