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无线传感器网络MIMO信道分布式检测的最优功率分配

Optimal Power Allocation for Distributed Detection over MIMO Channels in Wireless Sensor Networks

Xin Zhang, H. Vincent Poor, Mung Chiang

摘要:

在具有无线传感器网络的分布式检测系统中,由于传感器处的干扰和有限的发射器功率以对抗融合中心的接收器处的噪声,传感器与融合中心之间的通信并不完美。在这种不完全通信的情况下如何优化检测性能的问题给分布式检测带来了新的挑战。在本文中,传感器被假定为具有独立的,但不相同分布的意见,和多输入/多输出(MIMO)信道模型包括占传感器和融合中心之间的不完善的通信。不同假设下的检测统计量的分布之间的J-发散被用作性能标准,以提供易于处理的分析。研究了在传感器上具有单个和总发射功率约束的情况下优化性能(以J-发散度为依据),并给出了相应的功率分配方案。有趣的是,所提出的功率分配是两个因素之间的权衡,通信信道质量和本地决策质量。对于正交信道的情况,在一定条件下,功率分配可以通过加权注水算法来解决。仿真结果表明,为了达到相同的性能,在某些情况下,所提出的功率分配只消耗低至25%的总功率所使用的一个平等的功率分配方案。

英文摘要:

In distributed detection systems with wireless sensor networks, the communication between sensors and a fusion center is not perfect due to interference and limited transmitter power at the sensors to combat noise at the fusion center's receiver. The problem of optimizing detection performance with such imperfect communication brings a new challenge to distributed detection. In this paper, sensors are assumed to have independent but nonidentically distributed observations, and a multi-input/multi-output (MIMO) channel model is included to account for imperfect communication between the sensors and the fusion center. The J-divergence between the distributions of the detection statistic under different hypotheses is used as a performance criterion in order to provide a tractable analysis. Optimizing the performance (in terms of the J-divergence) with individual and total transmitter power constraints on the sensors is studied, and the corresponding power allocation scheme is provided. It is interesting to see that the proposed power allocation is a tradeoff between two factors, the communication channel quality and the local decision quality. For the case with orthogonal channels under certain conditions, the power allocation can be solved by a weighted water-filling algorithm. Simulations show that, to achieve the same performance, the proposed power allocation in certain cases only consumes as little as 25 percent of the total power used by an equal power allocation scheme.

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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