Experimental verification of multi-dimensional geometric shaping in OFDM-VLC system

IF 2.5 3区物理与天体物理 Q2 OPTICS Optics Communications Pub Date : 2025-03-23 DOI:10.1016/j.optcom.2025.131792

Ruoling Song , Jie Ma , Jia Lu , Jianfei Liu , Xiangye Zeng , Mingming Luo

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Abstract

In this paper, an innovative four-dimensional set-partitioning geometric shaping (4D-SP-GS) modulation format is proposed and experimentally verified in orthogonal frequency division multiplexing based visible light communication (OFDM-VLC). The method optimizes the position of the constellation points by using the quasi-polarization multiplexing. The perfect combination of SP and polarization ring switching (PRS) achieves flexible grouping and ring switching between constellation points, and further expand the minimum Euclidean distance (MED) of constellation points. Orthant symmetry (OS) reduces the complexity of constellation point mapping in 4D space. The entropy of the 4D-SP-GS can reach 8 bit/symbol. The simple real-valued precoding decreases the peak-to-average power ratio (PAPR) of OFDM and equalizes signal-to-noise ratio (SNR) distribution among subcarriers. Compared with traditional polarization-multiplexed 16 quadrature amplitude modulation (PM-16QAM), 4D geometric shell mapping (4D-GSS), 4D circular 256QAM (4D-c256QAM) and 4D-256PRS, experimental results show that the 4D-SP-GS can achieve a maximum operating range improvement of 50/45/30/8 mV when volts-peak-to-peak (VPP) is 60 mV–110 mV and 130/75/50/25 MS/s sampling rate improvement when the bit error rate (BER) satisfies 3.8 × 10⁻³, thus effectively improve the anti-nonlinearity performance of the system.

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OFDM-VLC系统中多维几何整形的实验验证

本文提出了一种新颖的四维集分割几何整形（4D-SP-GS）调制格式，并在基于正交频分复用的可见光通信（OFDM-VLC）中进行了实验验证。该方法利用准极化复用技术优化星座点的位置。SP与偏振环交换（PRS）的完美结合，实现了星座点之间的灵活分组和环交换，进一步扩大了星座点的最小欧氏距离（MED）。正交对称（OS）降低了四维空间星座点映射的复杂性。4D-SP-GS的熵值可以达到8bit /symbol。简单实值预编码降低了OFDM的峰均功率比（PAPR），均衡了子载波间信噪比（SNR）分布。实验结果表明，与传统的偏振复用16正交调幅（PM-16QAM）、四维几何壳映射（4D- gss）、四维圆形256QAM （4D- c256qam）和4D- 256prs相比，当VPP为60 mV ~ 110 mV时，4D- sp - gs的最大工作范围提高了50/45/30/8 mV，当误码率（BER）满足3.8 × 10−3时，采样率提高了130/75/50/25 MS/s。从而有效地提高了系统的抗非线性性能。

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来源期刊

Optics Communications 物理-光学

CiteScore

5.10

自引率

8.30%

发文量

681

审稿时长

38 days

期刊介绍： Optics Communications invites original and timely contributions containing new results in various fields of optics and photonics. The journal considers theoretical and experimental research in areas ranging from the fundamental properties of light to technological applications. Topics covered include classical and quantum optics, optical physics and light-matter interactions, lasers, imaging, guided-wave optics and optical information processing. Manuscripts should offer clear evidence of novelty and significance. Papers concentrating on mathematical and computational issues, with limited connection to optics, are not suitable for publication in the Journal. Similarly, small technical advances, or papers concerned only with engineering applications or issues of materials science fall outside the journal scope.