Journal of Convergence for Information Technology (융합정보논문지)

Convergence Society for SMB (중소기업융합학회)
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Dimming Level Control Technique for Lighting / Communication Functions in Visible Light Communication Systems

가시광통신 시스템에서 조명/통신 기능을 위한 효과적인 Dimming level control 기법

  • Lee, Kyu-Jin (Department of Electronic Engineering, Semyung University)
  • 이규진 (세명대학교 전자공학과)
  • Received : 2018.09.21
  • Accepted : 2018.10.20
  • Published : 2018.10.31
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Abstract

In this paper, we have studied a dimming level control method to satisfy both lighting and communication performance in visible light communication system. In the case of the most commonly used OOK and RZ-OOK modulation schemes, continuous Burst Zero Duration will seriously degrade the lighting function. This causes not only the illumination but also the performance of the entire system to deteriorate. Through this study, we analyzed the dimming level characteristics of the existing system and proposed the Illegal Pulse Insertion (IPI) algorithm as a technique to increase the dimming level. Through this, it is possible to effectively control the dimming level and improve the QoS of both lighting and communication by resolving the flicker phenomenon and dimming level reduction in the existing modulation and demodulation system.

본 논문에서는 가시광 통신시스템에서 조명과 통신의 성능을 동시에 만족하기 위한 Dimming level control 기법을 연구하였다. 일반적으로 가장 많이 사용되는 OOK와 RZ-OOK변조 방식의 경우, 연속적인 Burst Zero Duration이 발생하면 조명 기능이 심각하게 저하된다. 이는 조명뿐만 아니라 시스템 전체의 성능을 열하시키는 원인이 된다. 본 연구를 통해, 기존 시스템의 Dimming level특성을 분석하고, Dimming level을 높이기 위한 기법으로 Illegal Pulse Insertion(IPI) 알고리즘을 제안하였다. 이를 통해, Dimming level을 효과적으로 제어하고 기존 변복조 시스템에서 나타나는 플리커(flicker) 현상과 Dimming level 감소를 해결하여 조명과 통신 양쪽 모두의 QoS를 향상 시킬 수 있다.

Keywords

References

  1. D. G. Kim. (2014). Current status and direction of 5G modile communication. R&D Information and Communication, 23-28.
  2. S. Rajagopal et al. (Jul. 2009). TG7 Technical Considerations Document IEEE 802.15.7 Task Group Document.
  3. A. Z. Suriza, Sharmin Akter & M. Shahnan. (2017). Preliminary analysis of dimming property for visible light communication. IEEE 4th International Conference on Smart Instrumentation, Measurement and Application (ICSIMA), 1-5
  4. J. W. Kim, K. H. Lee & H. C. Park. (2012). Power Efficient Visible Light Communication Systems Under Dimming Constrain. IEEE 23rd International Symposium on Personal, Indoor and Mobile Radio Communications - (PIMRC).
  5. Ip Ezra, J. M. Kahn. (2006). Power spectra of return-to-zero optical signals Journal of Light wave technology, 24(3).
  6. Y. H. Liu, Z. Z. Yang & S. C. Wang. (2010). A novel sequential-color RGB-LED backlight driving system with local dimming control and dynamic bus voltage regulation. IEEE Transactions on Consumer Electronics, 56(4), 2445-2452. https://doi.org/10.1109/TCE.2010.5681126
  7. S. Shao, A. Khreishah & I. Khalil. (2016). Joint link scheduling and brightness control for greening VLC-based indoor access networks. IEEE/OSA Journal of Optical Communications and Networking, 8(3), 148. https://doi.org/10.1364/JOCN.8.000148
  8. G. T. Kim, D. H. Han, K. S. Lee & K. J. Lee. (2014). Analysis Performance of VLC System according to the Transmission Distance and Angle of Incidence. Journal of Convergence for Information Technology, 4(4), 37-42.
  9. K. T. Kim & K. J. Lee. (2017). Performance Evaluation and Analysis of Zero Reduction Codes for Effective Dimming Control in Optical Wireless Communications using LED Lightings. Journal of Convergence for Information Technology, 7(3), 97-103. https://doi.org/10.22156/CS4SMB.2017.7.3.097
  10. K. H. Lee & H. C. Park. (2011). Modulations for Visible Light Communications With Dimming Control. IEEE PHOTONICS TECHNOLOGY LETTERS, 23(16).
  11. K. J. Lee & G. J. Kim. (2015). The blocking channel to reduce the performance decrease using the low correlation with cyclic delay scheme in LED-ID system. Journal of Digital Convergence, 13(10), 319-325. https://doi.org/10.14400/JDC.2015.13.10.319
  12. K. J. Lee & G. J. Kim. (2014). Co-channel Interference Reduction using Multi code MC-CDMA in Visual Light Communication System. Journal of Digital Convergence, 12(8), 249-255. https://doi.org/10.14400/JDC.2014.12.8.249
  13. H. D. Seo & K. J. Lee. (2017). Efficient Data Transmission in LED-based Visible Light Communication Using Variable RGB Interleaving scheme. Journal of Convergence for Information Technology, 7(.6), 167-172. https://doi.org/10.22156/CS4SMB.2017.7.6.167