可见光通信中融合VOOK和分层OFDM的高效频谱混合调制方法

李宝龙; 施建锋; 吴勤勤; 冯斯梦

doi:10.11999/JEIT220368

可见光通信中融合VOOK和分层OFDM的高效频谱混合调制方法

doi: 10.11999/JEIT220368

李宝龙¹,
施建锋^{1, 2},
吴勤勤¹,
冯斯梦^3, ,

1.
南京信息工程大学电子与信息工程学院南京 210044
2.
东南大学移动通信国家重点实验室南京 210096
3.
南京航空航天大学电子信息工程学院南京 211106

基金项目: 国家自然科学基金(62001219)，江苏省自然科学基金(BK20190582、BK20210641)，东南大学移动通信国家重点实验室开放研究基金(2021D11)，江苏省高层次创新创业人才引进计划(JSSCBS20210159)，江苏省高等学校自然科学基金(20KJB510037)

详细信息

作者简介:
李宝龙：男，1989年生，博士，讲师，研究方向为可见光通信、无线通信

施建锋：男，1994年生，博士，讲师，研究方向为无线通信

吴勤勤：男，1991年生，博士，讲师，研究方向为光通信器件

冯斯梦：女，1993年生，博士，副研究员，研究方向为可见光通信、无线光通信

通讯作者:
冯斯梦　simeng-feng@nuaa.edu.cn

中图分类号: TN929.11
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出版历程
- 收稿日期: 2022-03-31
- 修回日期: 2022-07-11
- 录用日期: 2022-07-13
- 网络出版日期: 2022-07-14
- 刊出日期: 2022-08-17

Spectrum-Efficient Hybrid Modulation Based on VOOK and Layered OFDM for Visible Light Communications

LI Baolong¹,
SHI Jianfeng^{1, 2},
WU Qinqin¹,
FENG Simeng^{3
, ,}

1.
School of Electronics and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
2.
National Mobile Communications Research Laboratory, Southeast University, Nanjing 210096, China
3.
College of Electronics and Information Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China

Funds: The National Natural Science Foundation of China (62001219), The Natural Science Foundation of Jiangsu Province (BK20190582, BK20210641), The Open Research Fund of National Mobile Communications Research Laboratory, Southeast University (2021D11), The Shuangchuang Talent Program of Jiangsu Province (JSSCBS20210159), The Natural Science Foundation of the Jiangsu Higher Education Institutions of China (20KJB510037)

摘要

摘要: 为了满足可见光通信(VLC)的照明和高速率数据传输的双重需求，该文提出一种融合可变开关键控(VOOK)和分层正交频分复用(OFDM)的高效频谱混合调制。首先针对分层OFDM调制方法设计了相应的VOOK信号，避免了VOOK对分层OFDM信息传输的干扰。然后，为了保证混合调制信号工作在发光二极管(LED)的线性区间，提出一种全新的重构分层光OFDM(RLO-OFDM)，并构建VOOK-RLO-OFDM混合调制方法，实现了调光控制和高效频谱数据传输的双重功能。混合调制能够并行地进行VOOK和RLO-OFDM的信号检测，同时，RLO-OFDM的信号检测可以采用标准的OFDM接收机，无须依赖串行干扰消除方式，显著地降低了接收复杂度和处理时延。仿真结果表明，所提方法能够实现线性调光控制，且具有高效的频谱效率。
- 可见光通信 /
- 正交频谱复用 /
- 调光控制 /
- 可变开关键控
Abstract: In order to satisfy the requirements of illumination and high-speed transmission in Visible Light Communications (VLC), a novel spectrum-efficient hybrid modulation based on Variable On-Off Keying (VOOK) and layered Orthogonal Frequency Division Multiplexing (OFDM) is proposed in this paper. First, the VOOK signal is designed to avoid the interference with the layered OFDM transmission. In order to ensure that the hybrid signal operates in the linear dynamic range of Light-Emitting Diode (LED), a novel Reconstructed Layered Optical OFDM (RLO-OFDM) is further conceived. Then, the RLO-OFDM and VOOK signals are combined for simultaneous transmission to realize the dual functionalities of dimming control and spectrum-efficient data transmission. At the receiver side, the VOOK and RLO-OFDM signals are detected in parallel. Moreover, a standard OFDM receiver can be directly employed to detect the RLO-OFDM signal without requiring successive interference cancellation, which reduces notably the receiver complexity and processing latency. Simulation results show that the proposed scheme is capable of supporting the linear dimming control, and achieving high spectrum efficiency.
- Visible Light Communication (VLC) /
- Orthogonal Frequency Division Multiplexing (OFDM) /
- Dimming control /
- Variable On-Off Keying (VOOK)

HTML全文

图 1 采用$L = 2$, 3, 4层的频域结构示意图

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图 2 提出的混合调制流程框图

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图 3 混合调制的接收流程框图

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图 4 提出混合调制方法实现的调光水平与数据占空比${\delta _{\text{d}}}$的关系

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图 5 提出的RLO-OFDM方法的PAPR性能

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图 6 在不同比例因子$\alpha $下，提出的混合调制方法的BER性能

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图 7 不同调光水平下可调光调制方法的频谱效率

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