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arXiv 1408.2192cs.ITmath.IT
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面向具有相干多接入信道的无线感知的大规模 MIMO

Massive MIMO for Wireless Sensing with a Coherent Multiple Access Channel

Feng Jiang, Jie Chen, A. Lee Swindlehurst, Jose A. Lopez-Salcedo

AI总结:

本文研究大规模天线融合中心在相干多接入无线传感网络中的高斯信号检测与估计,给出 NP 检测器、LMMSE 估计器和能量检测器的最优发送增益及功率缩放规律。

摘要:

我们考虑在具有相干多接入信道的无线传感器网络中对零均值高斯信号进行检测与估计,其中融合中心(FC)配置有大量天线,并且传感器节点与 FC 之间的无线信道经历 Rayleigh 衰落。对于检测问题,我们研究 Neyman-Pearson(NP)检测器和能量检测器(ED),并求得传感器传输增益的最优值。对于需要信道状态信息(CSI)的 NP 检测器,我们表明,如果传感器发射功率随天线数量的增加成比例下降,则检测性能在 FC 天线数量趋于无穷时渐近保持恒定。性能界表明,随着发射功率增大,FC 处多天线带来的收益会消失。NP 检测器的结果还被推广到线性最小均方误差估计器。对于不需要 CSI 的 ED,我们推导了使检测器偏转系数最大化的最优增益,并表明,如果传感器发射功率按 FC 天线数量的平方根倒数缩放,则渐近可以实现恒定偏转。与 NP 检测器不同,在高传感器功率下,根据经验观察到多天线 ED 的性能显著优于单天线实现。文中包含若干仿真结果以验证该分析。

英文摘要:

We consider the detection and estimation of a zero-mean Gaussian signal in a wireless sensor network with a coherent multiple access channel, when the fusion center (FC) is configured with a large number of antennas and the wireless channels between the sensor nodes and FC experience Rayleigh fading. For the detection problem, we study the Neyman-Pearson (NP) Detector and Energy Detector (ED), and find optimal values for the sensor transmission gains. For the NP detector which requires channel state information (CSI), we show that detection performance remains asymptotically constant with the number of FC antennas if the sensor transmit power decreases proportionally with the increase in the number of antennas. Performance bounds show that the benefit of multiple antennas at the FC disappears as the transmit power grows. The results of the NP detector are also generalized to the linear minimum mean squared error estimator. For the ED which does not require CSI, we derive optimal gains that maximize the deflection coefficient of the detector, and we show that a constant deflection can be asymptotically achieved if the sensor transmit power scales as the inverse square root of the number of FC antennas. Unlike the NP detector, for high sensor power the multi-antenna ED is observed to empirically have significantly better performance than the single-antenna implementation. A number of simulation results are included to validate the analysis.

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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