arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.3405cs.ITmath.IT
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分布式感知中的估计多样性和能量有效性

Estimation Diversity and Energy Efficiency in Distributed Sensing

Shuguang Cui, Jinjun Xiao, Andrea Goldsmith, Zhi-Quan Luo, H. Vincent Poor

摘要:

研究了基于多个无线传感器测量的分布式估计问题。假设一组传感器在具有可能不同方差的独立加性观测噪声中观测到相同的量。使用放大和转发(模拟)传输通过非理想衰落无线信道从传感器到融合中心,在那里它们被组合起来,以生成所观察到的量的估计传输的意见。假设融合中心采用最佳线性无偏估计(BLUE),首先讨论了等功率传输策略,通过引入估计中断和估计分集的概念分析了系统性能,并证明了存在一个与传感器数量级相当的分集增益。最优功率分配策略,然后考虑两种情况下:最小失真下的功率约束和最小功率失真约束。在第一种情况下,示出了通过关闭坏的传感器,即,对于信道条件较差、观测质量较差的传感器,可以在不牺牲分集增益的情况下实现自适应功率增益。这里,自适应功率增益类似于当发射机已知信道条件时在多输入单输出(MISO)多天线系统中实现的阵列增益。在第二种情况下,在零中断估计失真约束下最小化总功率,并讨论了传感器网络中的一些相关能量效率问题。

英文摘要:

Distributed estimation based on measurements from multiple wireless sensors is investigated. It is assumed that a group of sensors observe the same quantity in independent additive observation noises with possibly different variances. The observations are transmitted using amplify-and-forward (analog) transmissions over non-ideal fading wireless channels from the sensors to a fusion center, where they are combined to generate an estimate of the observed quantity. Assuming that the Best Linear Unbiased Estimator (BLUE) is used by the fusion center, the equal-power transmission strategy is first discussed, where the system performance is analyzed by introducing the concept of estimation outage and estimation diversity, and it is shown that there is an achievable diversity gain on the order of the number of sensors. The optimal power allocation strategies are then considered for two cases: minimum distortion under power constraints; and minimum power under distortion constraints. In the first case, it is shown that by turning off bad sensors, i.e., sensors with bad channels and bad observation quality, adaptive power gain can be achieved without sacrificing diversity gain. Here, the adaptive power gain is similar to the array gain achieved in Multiple-Input Single-Output (MISO) multi-antenna systems when channel conditions are known to the transmitter. In the second case, the sum power is minimized under zero-outage estimation distortion constraint, and some related energy efficiency issues in sensor networks are discussed.

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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