The Journal of The Korea Institute of Intelligent Transport Systems (한국ITS학회 논문지)

The Korea Institute of Intelligent Transport Systems (한국ITS학회)
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Parallel Coding Scheme for Flicker Mitigation in MIMO-VLC

다중입출력 가시광통신에서 플리커 현상을 완화하기 위한 병렬 코딩 기법

  • 정진욱 (경희대학교 전자정보대학 전자전파공학과) ;
  • 이계산 (경희대학교 전자정보대학 전자전파공학과) ;
  • 서효덕 (경희대학교 전자정보대학 전자전파공학과) ;
  • 한두희 (경희대학교 전자정보대학 전자전파공학과) ;
  • 이규진 (세명대학교 전자공학과)
  • Received : 2016.02.16
  • Accepted : 2016.05.16
  • Published : 2016.06.30
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Abstract

Visible light communication using LED is a technique for transmitting digital data using the light of the LED. Recently, high-speed data rate plays an important role. Therefore, many scholars have researched the MIMO-VLC which is able to increase data rate using a lot of LED transmitters. However, it has problems such as light interference and flicker when transmitting different bit. Many researcher have focused on reduce interference. However it is not considered about flicker problem. Flicker is defined unstable brightness. It occurred the tired of human eyes, lowers eyesight and also decreases concentration. In order to solve this flicker problem in MIMO-VLC, we propose the PFM(Parallel Flicker Mitigation) code. PFM code using combinatorial theory can maintain constant brightness the whole bit duration. Therefore, it is possible to assure the brightness by confirm simulation results.

본 논문에서는 다중입출력 가시광통신에서 플리커 현상을 완화하기 위한 방법에 대하여 연구하였다. LED 가시광통신은 LED의 광을 이용하여 데이터를 전송하는 기술로 조명의 역할과 동시에 네트워크 구축이 가능한 효과적인 방법이다. 최근에는 전송률 향상을 위해 다수의 송신 LED를 이용한 다중입출력 가시광통신에 관한 연구가 활발히 진행되고 있다. 그러나 다중입출력 가시광통신은 송신 LED들 간의 광 간섭 문제와 수신부에서의 광 검출 문제, 서로 다른 데이터 비트를 전송하며 발생하는 플리커 문제점 등을 가지고 있다. 이러한 문제점들을 해결하기 위해 전송률과 오류율 성능에 관한 광 간섭과 광 검출 문제는 많은 연구가 진행되고 있지만 조명의 역할을 위한 플리커 현상의 문제점에 관하여 많은 연구가 진행되지 않고 있다. 이러한 다중입출력 가시광통신에서의 플리커 문제점을 해결하기 위하여 본 논문에서는 전송 패턴의 변화를 이용한 PFM(Parallel Flicker Mitigation) 코드를 제안하고 시뮬레이션을 통해 제안하는 시스템의 플리커 완화 성능을 분석하였다.

Keywords

References

  1. IEEE 802.15.7 WPAN Task Group 7 (TG7) Visible Light Communication, http://www.ieee802.org/15/pub/TG7.html, 2016.6.22.
  2. Tanaka Y.(2002), "A Study on Optical Wireless Communication Systems and Their Applications," ph.D dissertation, Keio University.
  3. Lubin Z., Dominic C. O., Hoa M. L., Grahame E. F., Kyungwoo L., YunJe O. and Eun T. W.(2009), "High data rate multiple input multiple output (MIMO) optical wireless communications using white LED lighting," IEEE J. Selected Areas In Communications, vol. 27, no. 9. pp.1-2. https://doi.org/10.1109/JSAC.2009.090101
  4. Kim K. T.(2013), "An Iterative Layered Interference Cancellation Approach for Improving the Performance of BER in VLC-OFDM system," MS. dissertation, Kyung Hee University.
  5. Nuwanpriya A., Ho S. -W. and Chen C. S.(2014), "Angle diversity receiver for indoor MIMO visible light communications," in Proc. IEEE Globecom Workshops (Optical Wireless Communications), pp. 529-534.
  6. Wang T. Q., Sekercioglu Y. A. and Armstrong J.(2013), "Analysis of an Optical Wireless Receiver Using a Hemispherical Lens with Application in MIMO Visible Light Communications," J. Lightwave Tech., vol. 31, pp.1744-54. https://doi.org/10.1109/JLT.2013.2257685
  7. Chen T., Liu L., Tu B., Zheng Z. and Hu W. (2014), "High-Spatial-Diversity Imaging Receiver Using Fisheye Lens for Indoor MIMO VLCs," IEEE Photonics Technology Letters, vol. 26, no. 22, November 15, pp.1-2. https://doi.org/10.1109/LPT.2013.2294132
  8. Seo H. D.(2013), "Performance Evaluation of the Time Synchronization Delay Diversity in Indoor Optical OFDM system using LEDs," MS. dissertation, Kyung Hee University.
  9. Wilkins A. Veitch J. and Lehman B.(2010), "LED lighting flicker and potential health concerns: IEEE Standard PAR1789 Update," in Proc. IEEE Energy Conv. Congress Expo., pp.171-178.
  10. Bai B. Xu Z. and Fan Y.(2010), "Joint LED Dimming and High Capacity Visible Light Communication by Overlapping PPM," in Proc. 19th Annu. Wireless Opt. Commun. Conf., Shanghai, China, pp.71-75.
  11. Roberts R. D., Rajagopal S. and Lim S. K.(2011), "IEEE 802.15.7 Physical Layer Summary," GLOBECOM Workshops, 2nd IEEE Workshop on Optical Wireless Communications, Houston, USA, pp.772-776.
  12. Hall M.(1980), Combinatorial Theory, Wiley, New York.

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