Separate Dimming Controlling and Data Transmission for an Indoor Visible Light Communication System 被引量：2

Separate Dimming Controlling and Data Transmission for an Indoor Visible Light Communication System

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摘要 Simultaneous dimming controlling and data transmission are usually required in a white LED based indoor visible light communication system.However,the diming controlling of LED normally interferes the data transmission due to the modulation nonlinearity of LED.In order to solve this problem,a scheme by separating the LEDs for the functions of dimming control and data transmission respectively is proposed in this paper.In the scheme,the LEDs used for dimming control function are driven by a dc amplified circuit,and the LEDs for data transmission are driven by a digital modulation circuit respectively.In this way,the modulation distortion to the data signal caused by the modulation nonlinearity can be avoided even if the dimming is at high level dc driven current.The proof-of-concept experiment of a 2.5Mbit/s visible light communication system demonstrates that the dimming controlling and data transmission can be realized simultaneously in a simple way,and the data transmission is not affected by the dimming controlling function.Compared to previous methods,the scheme in this paper is simpler and cost effective,and makes sense when high rate data is transmitted in a visible light communication system. Simultaneous dimming controlling and data transmission are usually required in a white LED based indoor visible light communication system.However,the diming controlling of LED normally interferes the data transmission due to the modulation nonlinearity of LED.In order to solve this problem,a scheme by separating the LEDs for the functions of dimming control and data transmission respectively is proposed in this paper.In the scheme,the LEDs used for dimming control function are driven by a dc amplified circuit,and the LEDs for data transmission are driven by a digital modulation circuit respectively.In this way,the modulation distortion to the data signal caused by the modulation nonlinearity can be avoided even if the dimming is at high level dc driven current.The proof-of-concept experiment of a 2.5Mbit/s visible light communication system demonstrates that the dimming controlling and data transmission can be realized simultaneously in a simple way,and the data transmission is not affected by the dimming controlling function.Compared to previous methods,the scheme in this paper is simpler and cost effective,and makes sense when high rate data is transmitted in a visible light communication system.

作者 LIU Xiang YANG Aiying LI Yankun FENG Lihui

机构地区 School of Opto-Electronics National Science and Technology Venture Capital Development Center

出处《China Communications》 SCIE CSCD 2015年第3期71-76,共6页 中国通信（英文版）

基金 financially supported by National Natural Science Foundation of China(No.61475094) National 973 Program of China(No.2013CB329202)

关键词 visible light communication light emitting diode diming controlling data transmission 光通信系统调光控制数据传输室内白色LED 调制电路控制功能分别驱动

分类号 TN929.1 [电子电信—通信与信息系统] TU113.66 [建筑科学—建筑理论]

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