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arXiv 2302.11969eess.SP
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XL-MIMO信道建模与预测用于无线功率传输

XL-MIMO Channel Modeling and Prediction for Wireless Power Transfer

Graz University of Technology(格拉茨工业大学)

Benjamin J. B. Deutschmann, Thomas Wilding, Maximilian Graber, Klaus Witrisal

AI总结:

本文针对XL-MIMO系统中初始接入问题,比较了几种波前成形方法,并展示了基于几何环境信息预测镜面多路径分量的可行性,验证了在3.8GHz频段下1W发射功率可实现12.3米距离的1mW功率传输。

摘要:

大规模天线阵列通过形成物理大孔径并具备聚焦能力,实现了卓越的无线功率传输(WPT)效率,同时在聚焦区域外具有低辐射水平。然而,利用这些特性需要准确的多径传播信道知识并克服典型应用场景中的(瑞利)衰落信道。为此,基于互易的波束成形是一种最优解决方案,通过上行链路的探测传输估计实际信道增益。但该方案不适用于无法在初始接入阶段发送任何探测信号的被动回传节点。利用测量的超大规模MIMO(XL-MIMO)测试平台的信道数据,我们比较了基于几何的平面波前和球面波前波束成形器与基于互易的波束成形器,以解决此初始接入问题。我们还展示了仅基于几何环境信息即可预测镜面多路径分量(SMCs)。我们证明,使用(40x25)阵列在3.8GHz频段下,1W发射功率足以将超过1mW的功率传输到12.3米距离的设备。基于几何的波束成形器利用预测的SMCs相比完美信道状态信息仅损失2dB。

英文摘要:

Massive antenna arrays form physically large apertures with a beam-focusing capability, leading to outstanding wireless power transfer (WPT) efficiency paired with low radiation levels outside the focusing region. However, leveraging these features requires accurate knowledge of the multipath propagation channel and overcoming the (Rayleigh) fading channel present in typical application scenarios. For that, reciprocity-based beamforming is an optimal solution that estimates the actual channel gains from pilot transmissions on the uplink. But this solution is unsuitable for passive backscatter nodes that are not capable of sending any pilots in the initial access phase. Using measured channel data from an extremely large-scale MIMO (XL-MIMO) testbed, we compare geometry-based planar wavefront and spherical wavefront beamformers with a reciprocity-based beamformer, to address this initial access problem. We also show that we can predict specular multipath components (SMCs) based only on geometric environment information. We demonstrate that a transmit power of 1W is sufficient to transfer more than 1mW of power to a device located at a distance of 12.3m when using a (40x25) array at 3.8GHz. The geometry-based beamformer exploiting predicted SMCs suffers a loss of only 2dB compared with perfect channel state information.

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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