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arXiv 2104.06472cs.ITmath.IT
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利用非定向波束形成码本减轻手阻塞

Mitigating Hand Blockage with Non-Directional Beamforming Codebooks

Vasanthan Raghavan, Ricardo A. Motos, M. Ali Tassoudji, Yu-Chin Ou, Ozge H. Koymen, Junyi Li

摘要:

手阻塞导致毫米波载波频率下的显著性能损害。许多先前的工作已经使用对喇叭天线和形状因子用户设备(UE)的研究来表征用手的信号强度的损失。然而,迄今为止还没有研究手对天线元件所见的有效相位响应的影响。为了实现这个目标,我们考虑了一种测量框架,该框架使用手持体模将UE保持在反映通话模式、观看视频和玩游戏的放松位置。我们首先研究阻塞对定向波束控制码本的影响。操纵波束所需的天线元件之间的紧密相位关系导致显著的性能下降,因为手表面可能使天线元件上观察到的幅度和相位失真,这无法通过该码本进行匹配。为了克服这种损失,我们提出了一个非定向波束形成码本的幅度和/或量化的相位与这些数量估计为必要的。理论和数值研究表明,所提出的码本可以去随机化的相位失真引起的手和相干组合的能量跨天线元件,从而有助于减轻手阻塞损失。

英文摘要:

Hand blockage leads to significant performance impairments at millimeter wave carrier frequencies. A number of prior works have characterized the loss in signal strength with the hand using studies with horn antennas and form-factor user equipments (UEs). However, the impact of the hand on the effective phase response seen by the antenna elements has not been studied so far. Towards this goal, we consider a measurement framework that uses a hand phantom holding the UE in relaxed positions reflective of talk mode, watching videos, and playing games. We first study the impact of blockage on a directional beam steering codebook. The tight phase relationship across antenna elements needed to steer beams leads to a significant performance degradation as the hand surface can distort the observed amplitudes and phases across the antenna elements, which cannot be matched by this codebook. To overcome this loss, we propose a non-directional beamforming codebook made of amplitudes and/or quantized phases with both these quantities estimated as necessary. Theoretical as well as numerical studies show that the proposed codebook can de-randomize the phase distortions induced by the hand and coherently combine the energy across antenna elements and thus help in mitigating hand blockage losses.

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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