Continuous-Aperture OAM Communication Systems: An Electromagnetic Information Theory Perspective

IF 5.5 3区计算机科学 Q1 COMPUTER SCIENCE, INFORMATION SYSTEMS IEEE Wireless Communications Letters Pub Date : 2024-12-18 DOI:10.1109/LWC.2024.3520082

Young-Seok Lee;Young Dam Kim;Bang Chul Jung

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Abstract

We present a novel continuous-aperture orbital angular momentum (CAP-OAM) communication system, which can be regarded as an asymptotic generalization of existing (discrete) uniform circular array-based OAM (UCA-OAM) systems. We first derive the current distribution that generates OAM mode in the CAP-OAM transmitter and specify the resulting radiated electric field. We characterize a closed-form equivalent discrete wireless channel model of the CAP-OAM system, which rigorously captures the effect of various system parameters, including path loss, carrier frequency, antenna aperture size, transmission distance, polarization interferences, etc. We also define the effective degrees of freedom (DoF) and mathematically analyze the achievable rate of CAP-OAM systems. Through computer simulations, we confirm that the CAP-OAM system significantly outperforms the classical UCA-OAM system in terms of achievable rates and effective DoF. To the best of our knowledge, CAP-OAM communication systems have not been investigated from the perspective of electromagnetic information theory.

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连续孔径 OAM 通信系统：电磁信息论视角

提出了一种新的连续孔径轨道角动量（CAP-OAM）通信系统，它可以看作是现有的（离散）均匀圆阵列OAM （UCA-OAM）系统的渐近推广。我们首先推导了CAP-OAM发射机中产生OAM模式的电流分布，并指定了产生的辐射电场。我们描述了CAP-OAM系统的封闭形式等效离散无线信道模型，该模型严格捕获了各种系统参数的影响，包括路径损耗、载波频率、天线孔径大小、传输距离、极化干扰等。我们还定义了CAP-OAM系统的有效自由度（DoF），并从数学上分析了CAP-OAM系统的可实现率。通过计算机仿真，我们证实了CAP-OAM系统在可实现速率和有效DoF方面明显优于经典的UCA-OAM系统。据我们所知，CAP-OAM通信系统还没有从电磁信息论的角度进行研究。

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来源期刊

IEEE Wireless Communications Letters Engineering-Electrical and Electronic Engineering

CiteScore

12.30

自引率

6.30%

发文量

481

期刊介绍： IEEE Wireless Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of wireless communications. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of wireless communication systems.