Journal of Convergence for Information Technology (융합정보논문지)

Convergence Society for SMB (중소기업융합학회)
권호 표지
DOI QR코드

DOI QR Code

A Study on the Effect of Signal Delay in Reduction Technique for Reducing Shading

연집제로구간에서 발생하는 음영현상을 줄이기 위한 기법에서 신호지연이 미치는 영향 연구

  • Han, Doo-Hee (Department of Electronics and Radio Engineering, Kyung Hee University) ;
  • Lee, Kyu-Jin (Department of Electronic Engineering, Semyung University)
  • 한두희 (경희대학교 전자전파공학과) ;
  • 이규진 (세명대학교 전자공학과)
  • Received : 2018.10.22
  • Accepted : 2018.12.20
  • Published : 2018.12.31
Download PDF
⟨ Previous Next ⟩

Abstract

In this paper, we analyzed the effect of modulation scheme and modulation scheme on the dimming level of visible light communication system and studied the effect of distortion due to delayed signal. Currently, the modulation schemes most commonly used in visible light communication result in increasing the communication performance but reducing the brightness of the entire illumination. Continuous Burst Zero Duration will severely degrade lighting. This degrades not only the illumination but also the performance of the whole system and causes Flicker phenomenon. In this paper, we analyze the relationship between modulation technique and illumination - communication performance and investigate the effect of signal delay on visible light communication system. Through simulation, we analyze the performance of IPI-OOK which has the best communication-lighting performance and propose future research directions accordingly.

본 논문에서는 가시광 통신시스템의 변조 방식과 각 변조 방식이 Dimming level에 미치는 영향을 분석하고, 지연신호로 인한 왜곡이 미치는 영향에 대해서 연구하였다. 현재 가시광 통신에서 가장 많이 사용되는 변조 방식들은 통신 성능은 증가하나 전체 조명의 밝기를 감소시키는 결과를 나타낸다. 연속적인 Burst Zero Duration이 발생하면 조명 기능이 심각하게 저하된다. 이는 조명뿐만 아니라 전체 시스템의 성능저하 시키게 되며 Flicker 현상을 유발한다. 본 논문에서는 이러한 변조 기술과 조명-통신 성능의 관계를 분석하고, 신호지연으로 인한 왜곡이 발생하였을 경우에 가시광 통신 시스템에 미치는 영향을 연구하였다. 시뮬레이션을 통해 통신-조명성능이 가장 좋은 IPI-OOK의 성능을 분석하고 그에 따른 향후 연구방향을 제안하였다.

Keywords

JKOHBZ_2018_v8n6_243_f0001.png 이미지

Fig. 1. VLC system structure diagram

JKOHBZ_2018_v8n6_243_f0002.png 이미지

Fig. 2. OOK / RZ-OOK sequence

JKOHBZ_2018_v8n6_243_f0003.png 이미지

Fig. 3. N-PPM sequence

JKOHBZ_2018_v8n6_243_f0004.png 이미지

Fig. 4. Burst Zero Duration in OOK/RZ-OOK [10]

JKOHBZ_2018_v8n6_243_f0005.png 이미지

Fig. 5. Illegal Pulse Insertion (IPI) algorithm[10]

JKOHBZ_2018_v8n6_243_f0006.png 이미지

Fig. 6. Signal distortion due to delay in OOK /RZ-OOK

JKOHBZ_2018_v8n6_243_f0007.png 이미지

Fig. 7. Signal distortion due to delay in IPI-OOK

JKOHBZ_2018_v8n6_243_f0008.png 이미지

Fig. 8. BER performance of delayed IPI-OOK signal and general signal

JKOHBZ_2018_v8n6_243_f0009.png 이미지

Fig. 9. When the probability of occurrence of the BZD interval is [0%, 25%, 50%, 75%, 100%], IPI-OOK Dimming level

Table 1. Dimming level according to modulation method

JKOHBZ_2018_v8n6_243_t0001.png 이미지

Table 2. Simulation parameter

JKOHBZ_2018_v8n6_243_t0002.png 이미지

References

  1. 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
  2. Y. Tanaka, T. Komine, S.Haruyama & M. Nakagawa. (2003). Indoor visible light data transmission system utilizing white LED lights. IEICE TRANS. COMMUN, E86B(8), 2440-2454.
  3. D. G. Kim (2014). Current status and direction of 5G modile communication R&D Information and Communication, 23-28.
  4. 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
  5. 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
  6. J. S. Cha, J. Y. Kim, Y. M. Jang, J. T. Kim, K. G. Lee & K. H. Moon. (2010). A Study of applying Method of Unipolar -ZCD Spr eading Code for LED-ID in Inter ference Environment. Applied IIBC, 10(6), 275-280,
  7. I. H. Park, Y. H. Kim, J. S. Cha, K. S. Lee, Y. M. Jang & J. Y. Kim. (2010). Scalable optical relay for LED-ID system. International Conference on Information and Communication Technology Convergence (ICTC), 415-420.
  8. Z. Feng, C. Guo, Z. Ghassemlooy & Y. Yang (2018), The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System. IEEE Photonics Journal, 10(5), Article Sequence Number: 7907013
  9. E. Ip & J. M.. Kahn. (2006). Power spectra of return-to-zero optical signals. Journal of Light wave technology, 24(3), 1610. https://doi.org/10.1109/JLT.2005.863328
  10. K. J. Lee. (2018), Dimming Level Control Technique for Lighting / Communication Functions in Visible Light Communication Systems. Journal of Convergence for Information Technology, 8(5), 153-158. https://doi.org/10.22156/CS4SMB.2018.8.5.153