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

Abstract

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

CLC Number:

TN929.1

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.

Figures/Tables 6

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

References 26

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