arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1209.4425cs.ITmath.IT
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稀疏噪声下参数场的分布估计

Distributed Estimation of a Parametric Field Using Sparse Noisy Data

Natalia A. Schmid, Marwan Alkhweldi, Matthew C. Valenti

摘要:

参数物理场的分布估计问题被描述为极大似然估计问题。加性高斯白噪声会使传感器观测值失真。在数据传输之前,每个传感器将其观测量化为$M$级别。量化后的数据通过并行加性白高斯信道传输到融合中心进行联合估计。提出了一种估计未知参数的期望最大化迭代算法,并将其线性化后用于数值分析。数值例子提供的情况下的场建模为高斯钟。分析了积分均方误差与量化层数、网络中传感器数目以及观测和传输信道信噪比的关系。

英文摘要:

The problem of distributed estimation of a parametric physical field is stated as a maximum likelihood estimation problem. Sensor observations are distorted by additive white Gaussian noise. Prior to data transmission, each sensor quantizes its observation to $M$ levels. The quantized data are then communicated over parallel additive white Gaussian channels to a fusion center for a joint estimation. An iterative expectation-maximization (EM) algorithm to estimate the unknown parameter is formulated, and its linearized version is adopted for numerical analysis. The numerical examples are provided for the case of the field modeled as a Gaussian bell. The dependence of the integrated mean-square error on the number of quantization levels, the number of sensors in the network and the SNR in observation and transmission channels is analyzed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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