Optical wireless networks with non-orthogonal multiple access (NOMA): concept, potential issues and enhanced capacity demonstration

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology Pub Date : 2025-04-16 DOI:10.1016/j.optlastec.2025.112888

Yin-He Jian, Tzu-Chieh Wei, Chi-Wai Chow

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引用次数: 0

Abstract

Optical wireless communication (OWC) has emerged as a complementary or alternative technology to the present radio-frequency (RF) communication by releasing the pressure on the highly congested RF spectrum. In this work, we introduce the concept of the power-domain non-orthogonal-multiple-access (PD-NOMA) scheme in OWC systems. We then discuss the potential issues and possible solutions. Afterwards, we propose a reconfigurable OWC system supporting not only scalable user numbers but also movable users. Achievable capacity regions under several optical power difference conditions are experimentally demonstrated and compared with those of the orthogonal-frequency-division-multiple-access (OFDMA) solutions. Up to the authors’ knowledge, this is the first comparison of evaluating PD-NOMA OWC systems in terms of achievable capacity regions rather than bit-error-rate (BER) improvements. We have shown that the low-density-parity-check (LDPC)-assisted PD-OFDM-NOMA scheme outperforms the LDPC-assisted OFDMA scheme with the capacity improvement > 11.5 %.

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非正交多址（NOMA）无线光网络：概念、潜在问题和增强容量演示

光无线通信（OWC）通过释放对高度拥挤的射频频谱的压力而成为当前射频（RF）通信的补充或替代技术。在本文中，我们引入了OWC系统中功率域非正交多址（PD-NOMA）方案的概念。然后我们讨论潜在的问题和可能的解决方案。然后，我们提出了一个可重构的OWC系统，该系统不仅支持可扩展的用户数量，而且支持可移动的用户。实验证明了几种光功率差条件下的可实现容量区域，并与正交频分多址（OFDMA）解决方案进行了比较。据作者所知，这是第一次比较PD-NOMA OWC系统的可实现容量区域，而不是误码率（BER）改进。我们已经证明了低密度奇偶校验（LDPC）辅助PD-OFDM-NOMA方案在容量改进方面优于LDPC辅助OFDMA方案；11.5%。

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

Optics and Laser Technology 物理-光学

CiteScore

8.50

自引率

10.00%

发文量

1060

审稿时长

3.4 months

期刊介绍： Optics & Laser Technology aims to provide a vehicle for the publication of a broad range of high quality research and review papers in those fields of scientific and engineering research appertaining to the development and application of the technology of optics and lasers. Papers describing original work in these areas are submitted to rigorous refereeing prior to acceptance for publication. The scope of Optics & Laser Technology encompasses, but is not restricted to, the following areas: •development in all types of lasers •developments in optoelectronic devices and photonics •developments in new photonics and optical concepts •developments in conventional optics, optical instruments and components •techniques of optical metrology, including interferometry and optical fibre sensors •LIDAR and other non-contact optical measurement techniques, including optical methods in heat and fluid flow •applications of lasers to materials processing, optical NDT display (including holography) and optical communication •research and development in the field of laser safety including studies of hazards resulting from the applications of lasers (laser safety, hazards of laser fume) •developments in optical computing and optical information processing •developments in new optical materials •developments in new optical characterization methods and techniques •developments in quantum optics •developments in light assisted micro and nanofabrication methods and techniques •developments in nanophotonics and biophotonics •developments in imaging processing and systems