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ZTE Communications ›› 2016, Vol. 14 ›› Issue (2): 23-28.DOI: 10.3969/j.issn.1673-5188.2016.02.003

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Optimal Transmission Power in a Nonlinear VLC System

ZHAO Shuang1,2,3, CAI Sunzeng1,2,3, KANG Kai4, QIAN Hua4   

  1. 1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
    2. Key Laboratory of Wireless Sensor Network & Communication, Chinese Academy of Sciences, Shanghai 200335, China;
    3. Shanghai Research Center for Wireless Communications, Shanghai 201210, China;
    4. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
  • 收稿日期:2015-12-11 出版日期:2016-04-01 发布日期:2019-11-27
  • 作者简介:ZHAO Shuang (shuang.zhao@wico.sh) received her BS degree from the Department of Sciences, Wuhan University of Technology, China in 2013. She is pursuing her MS degree in Shanghai Institute of Microsystem and Information Technology Research Institute, Chinese Academy of Sciences. Her current research interests include nonlinear signal processing and visible light communications.
    CAI Sunzeng (caisunzeng@163.com) received his BS degree from the Department of Communication & Information Engineering, Xi’an University of Posts & Telecommunications, China in 2010. He obtained his PhD degree from Shanghai Institute of Microsystem and Information Technology Research Institute, Chinese Academy of Sciences. His current research interests include nonlinear signal processing and visible light communications.
    KANG Kai (kangk@sari.ac.cn) received his PhD degree in electrical engineering from Tsinghua University, China, in 2007. He has been a senior engineer at the Shanghai Advanced Research Institute, Chinese Academy of Sciences since 2015. His research interests include next generation of Wi-Fi and 5G networks.
    QIAN Hua (qianh@sari.ac.cn) received his BS and MS degrees from the Department of Electrical Engineering, Tsinghua University, China, in 1998 and 2000, respectively. He obtained his PhD degree from the School of Electrical and Computer Engineering, Georgia Institute of Technology, USA, in 2005. He is currently with Shanghai Advanced Research Institute, Chinese Academy of Sciences as a full professor. His research interests include nonlinear signal processing and system design of wireless communications.
  • 基金资助:
    This work was supported in part by the National Key Science and Technology“863”Project under Grant No. SS2015AA011303 and the Science and Technology Commission Foundation of Shanghai under Gant No.14511100200

Optimal Transmission Power in a Nonlinear VLC System

ZHAO Shuang1,2,3, CAI Sunzeng1,2,3, KANG Kai4, QIAN Hua4   

  1. 1. Shanghai Institute of Microsystem and Information Technology, Chinese Academy of Sciences, Shanghai 200050, China;
    2. Key Laboratory of Wireless Sensor Network & Communication, Chinese Academy of Sciences, Shanghai 200335, China;
    3. Shanghai Research Center for Wireless Communications, Shanghai 201210, China;
    4. Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China
  • Received:2015-12-11 Online:2016-04-01 Published:2019-11-27
  • About author:ZHAO Shuang (shuang.zhao@wico.sh) received her BS degree from the Department of Sciences, Wuhan University of Technology, China in 2013. She is pursuing her MS degree in Shanghai Institute of Microsystem and Information Technology Research Institute, Chinese Academy of Sciences. Her current research interests include nonlinear signal processing and visible light communications.
    CAI Sunzeng (caisunzeng@163.com) received his BS degree from the Department of Communication & Information Engineering, Xi’an University of Posts & Telecommunications, China in 2010. He obtained his PhD degree from Shanghai Institute of Microsystem and Information Technology Research Institute, Chinese Academy of Sciences. His current research interests include nonlinear signal processing and visible light communications.
    KANG Kai (kangk@sari.ac.cn) received his PhD degree in electrical engineering from Tsinghua University, China, in 2007. He has been a senior engineer at the Shanghai Advanced Research Institute, Chinese Academy of Sciences since 2015. His research interests include next generation of Wi-Fi and 5G networks.
    QIAN Hua (qianh@sari.ac.cn) received his BS and MS degrees from the Department of Electrical Engineering, Tsinghua University, China, in 1998 and 2000, respectively. He obtained his PhD degree from the School of Electrical and Computer Engineering, Georgia Institute of Technology, USA, in 2005. He is currently with Shanghai Advanced Research Institute, Chinese Academy of Sciences as a full professor. His research interests include nonlinear signal processing and system design of wireless communications.
  • Supported by:
    This work was supported in part by the National Key Science and Technology“863”Project under Grant No. SS2015AA011303 and the Science and Technology Commission Foundation of Shanghai under Gant No.14511100200

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摘要： In a visible light communication (VLC) system, the light emitting diode (LED) is nonlinear for large signals, which limits the transmission power or equivalently the coverage of the VLC system. When the input signal amplitude is large, the nonlinear distortion creates harmonic and intermodulation distortion, which degrades the transmission error vector magnitude (EVM). To evaluate the impact of nonlinearity on system performance, the signal to noise and distortion ratio (SNDR) is applied, defined as the linear signal power over the thermal noise plus the front end nonlinear distortion. At a given noise level, the optimal system performance can be achieved by maximizing the SNDR, which results in high transmission rate or long transmission range for the VLC system. In this paper, we provide theoretical analysis on the optimization of SNDR with a nonlinear Hammerstein model of LED. Simulation results and lab experiments validate the theoretical analysis.

关键词: nonlinearity, light emitting diode (LED), SNDR

Abstract: In a visible light communication (VLC) system, the light emitting diode (LED) is nonlinear for large signals, which limits the transmission power or equivalently the coverage of the VLC system. When the input signal amplitude is large, the nonlinear distortion creates harmonic and intermodulation distortion, which degrades the transmission error vector magnitude (EVM). To evaluate the impact of nonlinearity on system performance, the signal to noise and distortion ratio (SNDR) is applied, defined as the linear signal power over the thermal noise plus the front end nonlinear distortion. At a given noise level, the optimal system performance can be achieved by maximizing the SNDR, which results in high transmission rate or long transmission range for the VLC system. In this paper, we provide theoretical analysis on the optimization of SNDR with a nonlinear Hammerstein model of LED. Simulation results and lab experiments validate the theoretical analysis.

Key words: nonlinearity, light emitting diode (LED), SNDR