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arXiv 2003.13505eess.SP
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使用MetaPrisms改善无线通信的性能

Using MetaPrisms for Performance Improvement in Wireless Communications

Davide Dardari, Devis Massari

摘要:

在本文中,我们提出了元棱镜的想法,一个被动的和不可重构的元表面作为一个元镜与频率相关的反射特性内的信号带宽。我们表明,与一个适当的设计的元棱镜,它是可能的控制,每个数据流在正交频分复用(OFDM)系统中反映在所需的方向,而不需要控制信道和基站和元棱镜之间的信道状态信息(CSI)估计,而是简单地通过正确地分配子载波给用户。此外,元棱镜还可以被设计为使得其将信号聚焦到取决于子载波的特定位置,假设其在近场中,从而降低路径损耗。一个关键的讨论也提出了关于可获得的路径损耗增益从metaprisms,更一般地说,从metasurfaces。数值结果表明,这种解决方案是令人惊讶的有效扩展的覆盖范围,在经历严重的非视距(NLOS)信道条件的区域,从而使其成为一个非常有吸引力的替代可重新配置的元表面时,低成本,无能耗,并向后兼容现有的无线标准是必需的。

英文摘要:

In this paper, we put forth the idea of metaprism, a passive and non-reconfigurable metasurface acting as a metamirror with frequency-dependent reflecting properties within the signal bandwidth. We show that, with an appropriate design of the metaprism, it is possible to control that each data stream in an orthogonal frequency division multiplexing (OFDM) system is reflected in the desired direction without the need for control channels and channel state information (CSI) estimation between the base station and the metaprism, but simply by correctly assigning subcarriers to users. Furthermore, the metaprism can also be designed so that it focuses the signal towards a specific position depending on the subcarrier, provided that it is in the near-field, with consequent path-loss reduction. A critical discussion is also presented about the path-loss gain obtainable from metaprisms and, more generally, from metasurfaces. The numerical results show that this solution is surprisingly effective in extending the coverage in areas experiencing severe non line-of-sight (NLOS) channel conditions, thus making it a very appealing alternative to reconfigurable metasurfaces when low-cost, no energy consumption, and backward compatibility with existing wireless standards are required.

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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