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arXiv 1407.7152cs.ITmath.ITstat.ME
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传感器网络分布式贝叶斯估计量化器设计研究

On Quantizer Design for Distributed Bayesian Estimation in Sensor Networks

Aditya Vempaty, Hao He, Biao Chen, Pramod K. Varshney

摘要:

我们考虑了贝叶斯准则下的分布估计问题,并探索了这样的系统中最佳量化器的设计。我们表明,对于一个有条件的无偏和有效的估计在融合中心,当本地观测具有相同的分布,这是最佳的本地传感器划分成组,与一组内的所有传感器使用相同的量化规则。当所有传感器使用相同数量的决策区域时,在传感器处使用相同的量化器是最佳的。当网络的无线多址接入信道的传感器传输其量化的意见的能力受到限制,我们表明,在本地传感器的二进制量化器在一定条件下是最佳的。基于这些观察,我们解决的位置参数估计问题,并提出了我们的最佳量化器设计方法。我们还推导了贝叶斯准则下分布式位置参数估计的性能极限,并找到了广泛使用的阈值量化器达到此极限的条件。我们证实了这一结果,使用模拟。然后,我们放松条件独立的观测值的假设,并推导出条件相关的观测值的量化器的最优性条件。使用反例,我们还表明,以前的结果并不成立,在这种设置的相关意见,因此,相同的量化器是不是最佳的。

英文摘要:

We consider the problem of distributed estimation under the Bayesian criterion and explore the design of optimal quantizers in such a system. We show that, for a conditionally unbiased and efficient estimator at the fusion center and when local observations have identical distributions, it is optimal to partition the local sensors into groups, with all sensors within a group using the same quantization rule. When all the sensors use identical number of decision regions, use of identical quantizers at the sensors is optimal. When the network is constrained by the capacity of the wireless multiple access channel over which the sensors transmit their quantized observations, we show that binary quantizers at the local sensors are optimal under certain conditions. Based on these observations, we address the location parameter estimation problem and present our optimal quantizer design approach. We also derive the performance limit for distributed location parameter estimation under the Bayesian criterion and find the conditions when the widely used threshold quantizer achieves this limit. We corroborate this result using simulations. We then relax the assumption of conditionally independent observations and derive the optimality conditions of quantizers for conditionally dependent observations. Using counter-examples, we also show that the previous results do not hold in this setting of dependent observations and, therefore, identical quantizers are not optimal.

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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