Performance Enhancement of OAM With OFDM-IM for FSO Communications Using LLR Detection

IF 4.8 1区计算机科学 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Broadcasting Pub Date : 2025-07-23 DOI:10.1109/TBC.2025.3587530

Aye Yadanar Win;Merhawit Berhane Teklu;Yeon Ho Chung

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引用次数: 0

Abstract

Orbital angular momentum (OAM) communication has emerged as a promising technology for significantly enhancing data transmission efficiency and overall system performance in free-space optical (FSO) communication systems. However, its performance is severely affected by atmospheric turbulence (AT), which leads to signal attenuation, crosstalk, and degradation in system capacity and bit error rate (BER). To address these challenges, this paper proposes a novel approach that integrates OAM multiplexing with orthogonal frequency division multiplexing using index modulation (OFDM-IM) under varying AT conditions. Additionally, a low-complexity log-likelihood ratio detector is employed for efficient signal detection. Simulation results demonstrate that the proposed system outperforms conventional OAM-MIMO in terms of BER and capacity across various turbulence regimes and OAM modes. The proposed system is evaluated using different parameters, including propagation distance, active indices, and the number of users. The results suggest that our proposed system effectively balances resilience to turbulence and spatial multiplexing, ensuring sustained capacity in challenging FSO environments.

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利用LLR检测提高OAM与OFDM-IM在FSO通信中的性能

轨道角动量（OAM）通信作为一种有前途的技术，在自由空间光通信系统中可以显著提高数据传输效率和系统整体性能。然而，大气湍流（AT）会严重影响其性能，导致信号衰减、串扰、系统容量和误码率（BER）下降。为了解决这些挑战，本文提出了一种新的方法，在不同的AT条件下，使用索引调制（OFDM-IM）将OAM复用与正交频分复用集成在一起。此外，采用低复杂度对数似然比检测器进行有效的信号检测。仿真结果表明，该系统在各种湍流状态和OAM模式下的误码率和容量方面优于传统的OAM- mimo。利用传播距离、活动指数和用户数等参数对系统进行了评价。结果表明，我们提出的系统有效地平衡了对湍流和空间复用的弹性，确保了在具有挑战性的FSO环境中的持续能力。

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 Broadcasting 工程技术-电信学

CiteScore

9.40

自引率

31.10%

发文量

审稿时长

6-12 weeks

期刊介绍： The Society’s Field of Interest is “Devices, equipment, techniques and systems related to broadcast technology, including the production, distribution, transmission, and propagation aspects.” In addition to this formal FOI statement, which is used to provide guidance to the Publications Committee in the selection of content, the AdCom has further resolved that “broadcast systems includes all aspects of transmission, propagation, and reception.”