Suppressing White-Noise Interference for Orbital Angular Momentum Waves via the Forward–Backward Dynamic Mode Decomposition

IF 4.6 1区计算机科学 Q1 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Antennas and Propagation Pub Date : 2022-12-19 DOI:10.1109/TAP.2022.3228645

Yanming Zhang;Lijun Jiang

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引用次数: 1

Abstract

When the orbital angular momentum (OAM)-carrying beam propagates in a highly boisterous environment, it causes the degradation of the OAM modes’ purity, which brings the crosstalk in the demultiplexing process. To address this issue, we extend the dynamic mode decomposition (DMD) method to suppress white-noise interferences of OAM by using the forward–backward DMD (FBDMD) approach. The FBDMD-based scheme retrieves the noise-free DMD mapping matrix corresponding to the actual OAM’s topological charges by combining the forward and backward DMD mapping matrix in the noisy environment and consequently reduces the crosstalk, particularly for sorting the superposed OAM modes. Numerical examples are provided to demonstrate the effectiveness and advantages of the proposed approach. It is found that the white-noise interference can be significantly suppressed in sorting the OAM modes process compared with previous works. Also, FBDMD is feasible for the whole aperture receiving and partial aperture receiving (PAR). This work offers a practical tool for OAM coaxial demultiplexing in a noisy environment.

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利用正反向动态模态分解抑制轨道角动量波的白噪声干扰

当携带轨道角动量（OAM）的光束在高噪声环境中传播时，会导致OAM模式纯度的降低，从而在解复用过程中产生串扰。为了解决这个问题，我们扩展了动态模式分解（DMD）方法，通过使用前向-后向DMD（FBDMD）的方法来抑制OAM的白噪声干扰。基于FBDMD的方案通过在噪声环境中组合前向和后向DMD映射矩阵来检索与实际OAM的拓扑电荷相对应的无噪声DMD映射阵，从而减少串扰，特别是对于对叠加的OAM模式进行排序。通过算例验证了该方法的有效性和优越性。研究发现，与以往的工作相比，在OAM模式排序过程中可以显著抑制白噪声干扰。此外，FBDMD对于整个孔径接收和部分孔径接收（标准杆数）是可行的。这项工作为噪声环境下的OAM同轴解复用提供了一个实用的工具。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Antennas and Propagation 工程技术-电信学

CiteScore

10.40

自引率

28.10%

发文量

968

审稿时长

4.7 months

期刊介绍： IEEE Transactions on Antennas and Propagation includes theoretical and experimental advances in antennas, including design and development, and in the propagation of electromagnetic waves, including scattering, diffraction, and interaction with continuous media; and applications pertaining to antennas and propagation, such as remote sensing, applied optics, and millimeter and submillimeter wave techniques