面向多速率码分多址可见光通信系统的新码集研究

doi:10.11959/j.issn.1000?436X.2020178

通信学报 ›› 2020, Vol. 41 ›› Issue (12): 1-7.doi: 10.11959/j.issn.1000?436X.2020178

• 学术论文 • 下一篇

面向多速率码分多址可见光通信系统的新码集研究

王建萍, 陈丹阳, 路慧敏, 金建力, 冯莉芳

北京科技大学计算机与通信工程学院，北京 100083

修回日期:2020-07-16 出版日期:2020-12-25 发布日期:2020-12-01
作者简介:王建萍（1974- ），女，河北保定人，博士，北京科技大学教授、博士生导师，主要研究方向为光纤通信理论、可见光通信、微波光子学。
陈丹阳（1993- ），女，河北张家口人，北京科技大学博士生，主要研究方向为可见光通信及其多址接入关键技术。
路慧敏（1978- ），女，辽宁新民人，博士，北京科技大学副教授，主要研究方向为可见光通信、光学器件设计。
金建力（1992- ），男，河北衡水人，北京科技大学博士生，主要研究方向为面向可见光通信的均衡技术、6G关键技术。
冯莉芳（1980- ），女，河南周口人，博士，北京科技大学副教授，主要研究方向为可见光通信、无线通信编码理论、中继技术等。
基金资助:
国家自然科学基金资助项目(61671055)

Study of a new code set in multi-rate CDMA VLC system

Jianping WANG, Danyang CHEN, Huimin LU, Jianli JIN, Lifang FENG

School of Computer and Communication Engineering, University of Science and Technology Beijing, Beijing 100083, China

Revised:2020-07-16 Online:2020-12-25 Published:2020-12-01
Supported by:
The National Natural Science Foundation of China(61671055)

摘要/Abstract

摘要：

针对无线通信多址接入系统中不同数据流量需求和 VLC 特点，构造了一种适用于多速率码分多址可见光通信系统的正交可变扩频因子-零互相关（OVSF-ZCC）码集，该码集包含可变长度的单极性扩频序列，序列之间保持零互相关特性。假设LED光源辐射为朗伯分布，进一步搭建了应用提出的OVSF-ZCC码集的多速率码分多址可见光通信系统模型，并在此基础上分析了码集构造参数、传输速率、传输距离等参数对该系统性能的影响。结果表明，所构造的OVSF-ZCC码集能够有效降低系统多址干扰（MAI）的影响，并支持多址接入系统中不同用户的多种速率传输。

关键词: 可见光通信, 码分多址接入, 正交可变扩频因子

Abstract:

For the diverse traffic requirements of the wireless communication multiple access system and the characteristics of VLC, a new orthogonal variable spreading factor zero cross correlation (OVSF-ZCC) code set was proposed for multi-rate VLC code division multiple access (CDMA) system, which consisted of unipolar spreading sequences with variable lengths, and zero cross correlation properties.Assuming the radiation of LED light source was Lambert distribution, a multi-rate CDMA-VLC system with proposed code set was further presented.The effects of construction parameters, transmission rate and distance on system performance were evaluated.The results show that the new code set can effectively reduce multiple access interference (MAI), and support multiple transmission rate requirements of different users in multiple access systems.

Key words: visible light communication, code division multiple access, orthogonal variable spreading factor

中图分类号:

TN929.1

王建萍, 陈丹阳, 路慧敏, 金建力, 冯莉芳. 面向多速率码分多址可见光通信系统的新码集研究[J]. 通信学报, 2020, 41(12): 1-7.

Jianping WANG, Danyang CHEN, Huimin LU, Jianli JIN, Lifang FENG. Study of a new code set in multi-rate CDMA VLC system[J]. Journal on Communications, 2020, 41(12): 1-7.

图/表 6

图1

表1

实验仿真参数"

参数	含义	取值
P_t	LED发射功率/W	1.0
$Φ_{\frac{1}{2}}$	半功率半角	70°
H	发送机平面到接收机平面垂直距离/m	2
A	光电探测器接收面积/cm²	1
ν₀	蓝光中心频率/nm	480
B	噪声带宽/MHz	100
η	光电转换系数	0.6
T_n	接收机噪声温度/K	300
R_L	接收器负载电阻/?	1 030
e	电子电荷量/C	1.602 189×10^-19
K_b	玻尔兹曼常数	1.380 650 5×10^-23
h	普朗克常数	6.626 196×10^-34

表1

图2

图3

图4

图5

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面向多速率码分多址可见光通信系统的新码集研究

Study of a new code set in multi-rate CDMA VLC system

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