基于嵌入式硬盘指示灯的可见光通信系统  

Visible Light Communication System Based on Embedded Hard Drive Indicator

作　　者：荣新驰 王超[1] 任嘉伟[1] 汪涛[1] 朱义君[1] Rong Xinchi;Wang Chao;Ren Jiawei;Wang Tao;Zhu Yijun(Strategic Support Force Information Engineering University,Zhengzhou,Henan 450001,China)

机构地区：[1]战略支援部队信息工程大学,河南郑州450001

出　　处：《光学学报》2020年第18期41-49,共9页Acta Optica Sinica

基　　金：国家重点研发计划(2018YFB1801903);国家自然科学基金(61671477,61901524);中国博士后科学基金(2019M663477)。

摘　　要：研究了基于发光二极管(LED)指示灯的可见光通信系统。在发送端,采用嵌入式个人电脑的硬盘指示灯,搭建硬件实验平台,采集数据并进行统计分析,得到信号模型的参数。在接收端,采用单光子雪崩二极管(SPAD)作为接收机,以提高接收机的灵敏度,扩展系统的通信距离。针对时钟漂移问题,提出一种脉冲宽度长-短键控(PWLSK)调制方案来代替传统的开关键控(OOK)方案,并通过硬件实验进行了验证。实验结果表明,在实验条件下,OOK调制方案的误码率(BER)始终无法降至10^-4以下,难以满足通信需求。并且在仿真实验中,OOK调制对环境光的强度更敏感,只有在环境光小于1 lx时才能降至10^-5以下。而PWLSK调制方案则可以在环境光强度更高的复杂环境下降低BER。所提方案可以实现即时消息、文件或语音信号的传输。In this article,we study the visible light communication system based on light-emitting diode(LED)indicator.In the transmitter,we employ the hard drive indicator of an embedded personal computer to build a hardware experimental platform.We statistically collect and analyze data to obtain the parameters of the signal model.In the receiver,we employ the single-photon avalanche diode(SPAD)as the receiver to improve the sensitivity of the receiver and extend the communication distance of the system.To solve the problem of clock drift,we propose a pulse width long-short keying(PWLSK)modulation scheme to replace the traditional on-off keying(OOK)scheme;we verify the scheme by hardware experiments.The experimental results show that under the experimental conditions,the bit error rate(BER)of the OOK modulation scheme can not be reduced to below 10^-4,which is difficult to meet the communication requirements.Additionally,simulation experiments show that the OOK modulation is more sensitive to ambient light intensity,and can be reduced to 10^-5 only when the ambient light intensity is less than 1 lx,while PWLSK modulation scheme can reduce its BER in complex environments with higher ambient light intensity.Based on the above analysis,the proposed scheme can realize the transmission of instant message,file,or voice signal.

关 键 词：光通信 可见光通信 发光二极管 单光子雪崩二极管 时钟漂移 误码率分析 

分 类 号：O436[机械工程—光学工程]