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Investigation on performance of special-shaped 8-quadrature amplitude modulation constellations applied in visible light communication

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Abstract

Light-emitting diode (LED)-based visible light communication (VLC) has become a potential candidate for nextgeneration ultra-high-speed indoor wireless communication. In this paper, four special-shaped 8-quadrature amplitude modulation (QAM) constellations are investigated in a single-carrier VLC system. It is numerically verified and experimentally demonstrated that circular (7,1) shows obvious superiority in the performance of the dynamic range of signal voltage peak-to-peak (vpp) value and bit error rate (BER). Next best is rectangular, followed by triangular; circular (4,4) has the worst performance. A data rate of 1.515 Gbit/s is successfully achieved by circular (7,1) employing a red chip LED over 0.5 m indoor free space transmission below a BER threshold of 3.8 × 10?3. Compared with circular (4,4), the traditional 8-QAM constellation, circular (7,1) provides a wider dynamic range of signal vpp, a higher data rate, and a longer transmission distance. To the best of our knowledge, this is the first investigation into the performance differences of special-shaped 8-QAM constellations in a highspeed, single-carrier VLC system, and the results comprehensively demonstrate that circular (7,1) is the optimal option.

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DOI:10.1364/prj.4.000249

基金项目:National Natural Science Foundation of China (NSFC) (61571133), National “863” Program of China (2015AA016904).

收稿日期:2016-06-27

修改稿日期:2016-08-23

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Jiaqi Zhao:Key Laboratory for Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
Chaoyi Qin:Key Laboratory for Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
Mengjie Zhang:Key Laboratory for Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China
Nan Chi:Key Laboratory for Information Science of Electromagnetic Waves (MoE), Department of Communication Science and Engineering, Fudan University, Shanghai 200433, China

联系人作者:Nan Chi(nanchi@fudan.edu.cn)

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引用该论文

Jiaqi Zhao, Chaoyi Qin, Mengjie Zhang, and Nan Chi, "Investigation on performance of special-shaped 8-quadrature amplitude modulation constellations applied in visible light communication," Photonics Research 4(6), 249-256 (2016)

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