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基于组合索引与欧氏距离相结合的OFDM-IM可见光通信系统研究

赵黎 何欢洁 孟祥艳 王宁

赵黎, 何欢洁, 孟祥艳, 王宁. 基于组合索引与欧氏距离相结合的OFDM-IM可见光通信系统研究[J]. 电子与信息学报, 2022, 44(8): 2710-2716. doi: 10.11999/JEIT220112
引用本文: 赵黎, 何欢洁, 孟祥艳, 王宁. 基于组合索引与欧氏距离相结合的OFDM-IM可见光通信系统研究[J]. 电子与信息学报, 2022, 44(8): 2710-2716. doi: 10.11999/JEIT220112
ZHAO Li, HE Huanjie, MENG Xiangyan, WANG Ning. Research on OFDM-IM Visible Light Communication System Based on Combination Index and Euclidean Distance[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2710-2716. doi: 10.11999/JEIT220112
Citation: ZHAO Li, HE Huanjie, MENG Xiangyan, WANG Ning. Research on OFDM-IM Visible Light Communication System Based on Combination Index and Euclidean Distance[J]. Journal of Electronics & Information Technology, 2022, 44(8): 2710-2716. doi: 10.11999/JEIT220112

基于组合索引与欧氏距离相结合的OFDM-IM可见光通信系统研究

doi: 10.11999/JEIT220112
基金项目: 国家自然科学基金(12004292),陕西省科技厅一般项目-工业领域(2022GY-072),西安市科技计划项目(2020KJRC0040)
详细信息
    作者简介:

    赵黎:女,1981年生,博士,教授,硕士生导师,研究方向为无线光通信关键技术

    何欢洁:女,1997年生,硕士生,研究方向为无线光通信关键技术

    孟祥艳:女,1980年生,博士,研究方向为可见光定位关键技术

    王宁:男,1998年生,硕士生,研究方向为无线光通信关键技术

    通讯作者:

    何欢洁 hhj0523@163.com

  • 中图分类号: TN929.1

Research on OFDM-IM Visible Light Communication System Based on Combination Index and Euclidean Distance

Funds: The National Natural Science Foundation of China (12004292), The General Project of Science and Technology Department of Shaanxi Province – Industry (2022GY-072), Xi’an Science and Technology Planning Project (2020KJRC0040)
  • 摘要: 直流偏置光正交频分复用系统(DCO-OFDM)存在较高的峰均比(PAPR)、易受多径干扰和噪声频偏等影响。因此该文将载波索引调制(IM)引入DCO-OFDM中,提出适合可见光通信(VLC)的DCO-OFDM-IM调制方案。该方案采用基于组合索引与欧氏距离相结合的信号映射约束模型对子载波进行分块组合索引,不仅可在信号域使用传统星座调制传递信息,还可通过频率域利用载波索引额外携带信息,有效改善了系统峰均比及误码率性能。推导了DCO-OFDM-IM系统的理论误码率(BER),利用蒙特卡罗方法对其进行仿真验证。结果表明:相对传统DCO-OFDM系统,当子载波数为256,调制阶数为4,系统误码率为10–3时,DCO-OFDM-IM系统所需信噪比平均改善了约2 dB;当误码率为10–3时,采用组合索引与欧氏距离相结合的算法较随机选取载波组合系统所需信噪比平均改善约2 dB;当系统互补累计分布函数(CCDF)为10–1时,DCO-OFDM-IM原始信号峰均比比DCO-OFDM下降了约2.4 dB。
  • 图  1  DCO-OFDM-IM模型

    图  2  OFDM和OFDM-IM在不同调制阶数理论误码率和仿真误码率

    图  3  不同组合数下DCO-OFDM-IM系统误码率

    图  4  OFDM和OFDM-IM系统峰均功率比性能

    表  1  基于最大化最小欧氏距离算法的OFDM-IM映射表

    索引序号索引比特索引序列信号子块
    1$ \left[ {0,0} \right] $$ \left[ {1,2} \right] $$ {\left[ {{X_i},{X_j},0,0} \right]^{\text{T}}} $
    2$ \left[ {0,1} \right] $$ \left[ {1,3} \right] $$ {\left[ {{X_i},0,{X_j},0} \right]^{\text{T}}} $
    3$ \left[ {1,0} \right] $$ \left[ {1,4} \right] $$ {\left[ {{X_i},0,0,{X_j}} \right]^{\text{T}}} $
    4$ \left[ {1,1} \right] $$ \left[ {2,4} \right] $$ {\left[ {0,{X_i},0,{X_j}} \right]^{\text{T}}} $
    未用$ \left[ {3,4} \right] $ $ \left[ {2,3} \right] $
    下载: 导出CSV

    表  2  系统频谱效率对比与运行时间对比

    系统时间(s)调制阶数信噪比(dB)频谱效率(bps/Hz)
    OFDM0.106BPSK220.5
    0.11QPSK251
    0.1218PSK291.5
    (4,2)-OFDM-IM0.081BPSK180.5
    0.085QPSK230.75
    0.0978PSK261.75
    (2,1)-OFDM-IM0.04QPSK200.75
    (4,1)-OFDM-IM0.062QPSK160.5
    (8,1)-OFDM-IM0.107QPSK140.3125
    (8,7)-OFDM-IM0.118QPSK241.0625
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-01-27
  • 修回日期:  2022-05-12
  • 录用日期:  2022-06-08
  • 网络出版日期:  2022-06-10
  • 刊出日期:  2022-08-17

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