基于LED车灯的车联网高速通信系统  

High Speed Communication System for the Internet of Vehicles Based on LED Headlight

作　　者：蒋子豪 刘渊帆 梁尚雨 王福民 李广士 乔梁[1] 迟楠[1] JIANG Zihao;LIU Yuanfan;LIANG Shangyu;WANG Fumin;LI Guangshi;QIAO Liang;CHI Nan(Key Laboratory of Electromagnetic Wave Information Science,Ministry of Education,Department of Communication Science and Engineering,Fudan University,Shanghai 200433,China)

机构地区：[1]复旦大学通信科学与工程系电磁波信息科学教育部重点实验室,上海200433

出　　处：《照明工程学报》2019年第1期84-87,111,共5页China Illuminating Engineering Journal

基　　金：国家重点研发计划"智慧照明传感关键技术和产品开发"(批准号:2017YFB403403)

摘　　要：提出了一种可适用于车联网中前车与后车之间的车灯可见光通信系统。发射端光源采用车灯LED模组,使用光二极管和示波器组成接收端,调制方式为离散多音频调制。我们将采集到的数据在计算机终端进行离线处理,在2 m的自由空间进行传输时,系统的单向传输速率达到181. 25 Mb/s,同时传输误码率低于误码门限3. 8×10-3,基本能满足现时路况中近距离的前车与后车之间的通信交互。最后,通过实验找到了该车灯模组在进行可见光通信时的最佳工作点,即驱动电流为340 m A,信号幅值为0. 7 V。In this paper, we proposed a headlight visible light communication(VLC) system which is applied for front and rear vehicles in the internet of vehicles. The headlight module is used as transmitted light source and a PIN and an oscilloscope are used as the receiving end. In the system, the modulation method is discrete multi-tone (DMT) modulation. Data is collected for offline processing. The unidirectional total data rate is 181.25 Mbps with BER under the limit of 3.8×10 -3 after 2 m free-space transmission. It can basically meet the communication between the front and the rear cars in the current road condition at short range. Finally, through experiments, the optimal working point of the headlight module in the process of visible light communication is found, namely, the driving current is 340 mA and the signal amplitude is 0.7 V.

关 键 词：车联网 可见光通信 离散多音频 车灯 LED 

分 类 号：TN929.12[电子电信—通信与信息系统]