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arXiv 2303.04003cs.ITeess.SPmath.IT
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近场通信:将会有何不同?

Near-Field Communications: What Will Be Different?

Yuanwei Liu, Jiaqi Xu, Zhaolin Wang, Xidong Mu, Lajos Hanzo

AI总结:

本文从信道建模、性能分析、波束成形、应用四个维度系统对比近场通信与远场通信的差异,提出新型信道模型与波束成形结构,验证其在感知和安全方面的优势,并指明未来研究方向。

摘要:

本文从四个视角解答了“近场通信(NFC)与远场通信(FFC)之间究竟有何差异”这一设计难题。1)信道建模视角:探讨了近场与远场信道模型的差异,针对连续孔径天线提出了一种基于格林函数的新型信道模型,并将其与专为空间离散天线设计的传统信道模型进行了对比。2)性能分析视角:针对空间离散天线和连续孔径天线,分别给出了表征近场区域自由度和功率缩放规律的解析结果。3)波束成形视角:远场波束成形类似于可实现波束指向的“手电筒”,而近场波束成形则可比作能促进波束聚焦的“聚光灯”;作为进一步的进展,本文提出了两种新型波束成形结构,以利用NFC的新特性。4)应用视角:结合NFC中极具前景的下一代技术场景讨论了新设计,我们的初步数值结果表明,NFC可实现距离感知的目标感知和增强的物理层安全。最后,本文探讨了NFC的若干未来研究方向。

英文摘要:

The design dilemma of "What will be different between near-field communications (NFC) and far-field communications (FFC)?" is addressed from four perspectives. 1) From the channel modelling perspective, the differences between near-field and far-field channel models are discussed. A novel Green's function-based channel model is proposed for continuous-aperture antennas, which is contrasted to conventional channel models tailored for spatially-discrete antennas. 2) From the performance analysis perspective, analytical results for characterizing the degrees of freedom and the power scaling laws in the near-field region are provided for both spatially-discrete and continuous-aperture antennas. 3) From the beamforming perspective, far-field beamforming is analogous to a "flashlight" that enables beamsteering, while near-field beamforming can be likened to a "spotlight" that facilitates beamfocusing. As a further advance, a couple of new beamforming structures are proposed for exploiting the new characteristics of NFC. 4) From the application perspective, new designs are discussed in the context of promising next-generation technologies in NFC, where our preliminary numerical results demonstrate that distance-aware target sensing and enhanced physical layer security can be realized in NFC. Finally, several future research directions of NFC 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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