Visible light communications employing PPM and PWM formats for simultaneous data transmission and dimming

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• 作者：Joon-ho Choi (1)
  Eun-byeol Cho (1)
  Zabih Ghassemlooy (2)
  Soeun Kim (3)
  Chung Ghiu Lee (1)
  
  1. Department of Electronic Engineering ; Chosun University ; Gwangju聽 ; 501-759 ; Korea
  2. Optical Communications Research Group ; Faculty of Engineering and Environment ; Northumbria University ; Newcastle upon Tyne聽 ; NE1 8ST ; UK
  3. Advanced Photonics Research Institute ; Gwangju Institute of Science and Technology ; Gwangju聽 ; 500-712 ; Korea
  
• 关键词：Optical communications ; Optical wireless communications ; Visible light communications ; Illumination ; Light ; emitting diodes ; Dimming control ; PPM ; PWM
• 刊名：Optical and Quantum Electronics
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：47
• 期：3
• 页码：561-574
• 全文大小：2,247 KB
• 参考文献：1. Bai, B., Xu, Z., Fan, Y.: Joint LED dimming and high capacity visible light communication by overlapping PPM. In: 19th Wireless and Optical Communications Conference (WOCC 2010), pp. 71鈥?5 (2010)
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  4. Dyble, M., Narendran, N., Bierman, A., Klein, T.: Impact of dimming white LEDs: chromaticity shifts due to different dimming methods. Proc. SPIE 5941, 59411H (2005) CrossRef
  5. Garcia, J., Dalla-Costa, M.A., Cardesin, J., Alonso, J.M., Rico-Secades, M.: Dimming of high-brightness LEDs by means of luminous flux thermal estimation. IEEE Trans. Power Electron. 24, 1107鈥?114 (2009) CrossRef
  6. Ghassemlooy, Z., Popoola, W.O., Rajbhandari, S.: Optical Wireless Communications: System and Channel Modelling with MATLAB. CRC, Boca Raton (2012)
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  18. Moon, H.-D., Jung, S.-Y.: Multi-coded variable PPM for high data rate visible light communications. J. Opt. Soc. Korea 16, 107鈥?14 (2012) CrossRef
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  22. Siddique, A.B., Tahir, M.: Joint brightness control and data transmission for visible light communcation systems based on white LEDs. In: Proceedings of Consumer Communications and Networking Conference (CCNC 2011), pp. 1026鈥?030 (2011)
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• 刊物主题：Optics, Optoelectronics, Plasmonics and Optical Devices; Electrical Engineering; Characterization and Evaluation of Materials; Computer Communication Networks;
• 出版者：Springer US
• ISSN：1572-817X

文摘

A visible light communication system with simultaneous brightness control and data transmission is experimentally demonstrated in this paper. A pulse-width modulation (PWM) scheme is adopted for brightness control of the light-emitting diode and pulse-position modulation (PPM) superimposed on top of PWM is used for data communications. We show that independent control of light dimming is possible while transmitting data within a typical room environment, provided the PWM dimming period is an integer multiple of the PPM slot duration. To validate this, we show the measured eye diagrams for a range of dimming levels. In addition, we qualitatively illustrate examples of different dimming levels by changing the dimming level while maintaining the PPM data stream.