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张超, 王元赫
作者简介:
张超(1978-),男,陕西城固人,清华大学航天航空学院教授、博士生导师,IET 会士、IEEE
高级会员、IEICE 高级会员。工信部IMT-2030(6G)无线技术工作组OAM 任务组组长。主
要研究方向为涡旋电磁波传输与探测,以及航空宇航电子系统。
王元赫(1997-),男,江苏涟水人,清华大学航天航空学院博士生,主要研究方向为电磁波轨
道角动量传输与探测。
摘要: 轨道角动量(OAM)是电磁波的固有物理量,与电场强度的物理量纲线性无关,所以相互独立,
可构成无线传输中的新维度。作为下一代移动通信中潜在关键技术的涡旋电磁波OAM 传输易与传统多天线
多输入多输出(MIMO)传输相混淆,从而引发关于涡旋电磁波OAM 是否在无线传输中提供新维度的争
议。本文从电磁波资源利用和发展的历史出发,分析了电磁波OAM 的物理特征,明确了只有电磁波量子携
带内禀OAM 的涡旋电磁波传输系统才可以获得MIMO 传输以外的无线传输新维度;统计态OAM 涡旋波束
中的电磁波量子形成的外部OAM 与空域维度相耦合,无法构成MIMO 传输以外的新维度,但在直射视距
(LoS)信道时可获得额外自由度和较低的复杂度。依据信道容量的不同,本文将典型涡旋电磁波OAM 传
输系统划分为四个不同区域,并着重指出量子态OAM 涡旋电磁波传输可以形成超越传统MIMO 容量界的含
有OAM维度的新MIMO 容量界。
张超, 王元赫. 论涡旋电磁波轨道角动量传输新维度[J]. 通信学报.
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