Exploring multiamplitude voltage modulation to improve spectrum efficiency in low-complexity visible-light communication

  • Xiangyu Liu
  • Xuetao Wei
  • Lei GuoEmail author
  • Yejun Liu
Research Paper Special Focus on B5G Wireless Communication Networks


Owing to the recent advancements in the Internet of Things (IoT), an increasing number of IoT devices have led to frequency crowding in wireless networks. The low-complexity visible light communication (VLC) system is a promising solution for indoor frequency-crowded wireless networks owing to the ubiquity of light-emitting diodes (LEDs) and readily deployable, low-cost modulation methods. However, due to the inherent limitations of LED materials and growth of data from IoT applications, low-complexity VLC systems can barely boost the data throughput without adding complex modulations and circuits. This study aims to design and implement a spectrum-efficient, low-complexity VLC system to improve data throughput with very little cost to support indoor IoT applications. This system uses multiamplitude voltage to transmit multiple bit streams simultaneously, making it a novel system. However, it is not trivial to achieve this goal as the varying voltage can cause the LEDs to flicker. Therefore, we further propose a voltage-to-current amplifier circuit, which effectively mitigates the effects of changes in the LED’s brightness upon human eyes. Finally, we evaluate the system under different speeds, distances, and angles. Extensive experiments demonstrate promising results from the viewpoint of spectrum efficiency, throughput, bit-error rate, and user perception.


visible light communication amplitude modulation spectral efficiency 



This work was supported in part by National Nature Science Foundation of China (Grant Nos. 61801105, 61501104, 61775033, 61771120), and in part by Fundamental Research Funds for the Central Universities (Grant Nos. N161604004, N161608001, N171602002).


  1. 1.
    Komine T, Nakagawa M. Fundamental analysis for visible-light communication system using LED lights. IEEE Trans Consumer Electron, 2004, 50: 100–107CrossRefGoogle Scholar
  2. 2.
    Ibrahim M, Nguyen V, Rupavatharam S, et al. Visible light based activity sensing using ceiling photosensors. In: Proceedings of the Workshop on Visible Light Communication Systems, 2016. 43–48Google Scholar
  3. 3.
    Quintana C, Guerra V, Rufo J, et al. Reading lamp-based visible light communication system for in-flight entertainment. IEEE Trans Consumer Electron, 2013, 59: 31–37CrossRefGoogle Scholar
  4. 4.
    Schmid S, Ziegler J, Corbellini G, et al. Using consumer led light bulbs for low-cost visible light communication systems. In: Proceedings of the Workshop on Visible Light Communication System, 2014Google Scholar
  5. 5.
    Xu J, Yao J M, Wang L, et al. Narrowband Internet of things: evolutions, technologies, and open issues. IEEE Internet Things J, 2018, 5: 1449–1462CrossRefGoogle Scholar
  6. 6.
    Tian Z, Wright K, Zhou X. Lighting up the Internet of things with darkVLC. In: Proceedings of the 17th International Workshop on Mobile Computing Systems and Applications, 2016. 33–38Google Scholar
  7. 7.
    Schmid S, Corbellini G, Mangold S, et al. LED-to-LED visible light communication networks. In: Proceedings of the 14th ACM International Symposium on Mobile ad Hoc Networking and Computing, 2013. 1–10Google Scholar
  8. 8.
    Khalid A M, Cossu G, Corsini R, et al. 1-Gb/s transmission over a phosphorescent white LED by using rate-adaptive discrete multitone modulation. IEEE Photonic J, 2012, 4: 1465–1473CrossRefGoogle Scholar
  9. 9.
    Tsonev D, Chun H, Rajbhandari S, et al. A 3-Gb/s single-LED OFDM-based wireless VLC link using a gallium nitride μ LED. IEEE Photon Technol Lett, 2014, 26: 637–640CrossRefGoogle Scholar
  10. 10.
    Zhao L X, Zhu S C, Wu C H, et al. GaN-based LEDs for light communication. Sci China-Phys Mech Astron, 2016, 59: 107301CrossRefGoogle Scholar
  11. 11.
    Singh R, O’Farrell T, David J P R. Performance evaluation of IEEE 802.15.7 CSK physical layer. In: Proceedings of IEEE Globlecom Workshops (GC Wkshps), Atlanta, 2013Google Scholar
  12. 12.
    Qian H, Cai S Z, Yao S J, et al. On the benefit of DMT modulation in nonlinear VLC systems. Opt Express, 2015, 23: 2618CrossRefGoogle Scholar
  13. 13.
    Alaka S P, Narasimhan T L, Chockalingam A. On the performance of single- and multi-carrier modulation schemes for indoor visible light communication systems. In: Proceedings of IEEE Globecom, 2015Google Scholar
  14. 14.
    Wu F M, Lin C T, Wei C C, et al. Performance comparison of OFDM signal and CAP signal over high capacity RGB-LED-Based WDM visible light communication. IEEE Photonic J, 2013, 5: 7901507CrossRefGoogle Scholar
  15. 15.
    Le N T, Nguyen T, Jang Y M. Frequency shift on-off keying for optical camera communication. In: Proceedings of the 6th International Conference on Ubiquitous and Future Networks (ICUFN), Shanghai, 2014Google Scholar
  16. 16.
    Popoola W, Poves E, Haas H. Generalised space shift keying for visible light communications. In: Proceedings of International Symposium on Communication Systems Networks Digital Signal Processing, 2012Google Scholar
  17. 17.
    Ghassemlooy Z, Popoola W, Rajbhandari S. Optical Wireless Communications: System and Channel Modelling with MATLAB. Abingdon: Taylor and Francis, 2012Google Scholar
  18. 18.
    Zeng Y, Green R J, Sun S B, et al. Tunable pulse amplitude and position modulation technique for reliable optical wireless communication channels. J Commun, 2007, 2: 22–28CrossRefGoogle Scholar
  19. 19.
    Geng L, Wei J L, Penty R V, et al. 3 Gbit/s LED-based step index plastic optical fiber link using multilevel pulse amplitude modulation. In: Proceedings of Optical Fiber Communication Conference and Exposition and the National Fiber Optic Engineers Conference (OFC/NFOEC), Anaheim, 2013Google Scholar
  20. 20.
    Li H L, Chen X B, Huang B J, et al. High bandwidth visible light communications based on a post-equalization circuit. IEEE Photonic Tech Lett, 2014, 26: 119–122CrossRefGoogle Scholar
  21. 21.
    Mirvakili A, Koomson V J. A flicker-free CMOS LED driver control circuit for visible light communication enabling concurrent data transmission and dimming control. Analog Integr Circ Sig Process, 2014, 80: 283–292CrossRefGoogle Scholar
  22. 22.
    Park S B, Jung D K, Shin H S, et al. Information broadcasting system based on visible light signboard. In: Proceedings of Acta Press, 2007Google Scholar
  23. 23.
    Komine T, Lee J H, Haruyama S, et al. Adaptive equalization system for visible light wireless communication utilizing multiple white LED lighting equipment. IEEE Trans Wirel Commun, 2009, 8: 2892–2900CrossRefGoogle Scholar
  24. 24.
    Galal M M, El Aziz A A, Fayed H A, et al. High speed data transmission over a visible light link employing smartphones xenon flashlight as a replacement of magnetic cards. In: Proceedings of IEEE High Capacity Optical Networks and Emerging/Enabling Technologies, 2013Google Scholar
  25. 25.
    Wu S, Wang H, Youn C H. Visible light communications for 5G wireless networking systems: from fixed to mobile communications. IEEE Netw, 2014, 28: 41–45CrossRefGoogle Scholar
  26. 26.
    Park I H, Kim Y H, Jin Y K. Interference mitigation scheme of visible light communication systems for aircraft wireless applications. In: Proceedings of IEEE International Conference on Consumer Electronics (ICCE), Las Vegas, 2012Google Scholar
  27. 27.
    Haas H. Light fidelity (Li-Fi): towards all-optical networking. In: Proceedings of SPIE-The International Society for Optical Engineering, 2013. 900702Google Scholar
  28. 28.
    Kong L, Shen H, Xu W, et al. Transmission capacity maximization for LED array-assisted multiuser VLC systems. Sci China Inf Sci, 2015, 58: 082310Google Scholar
  29. 29.
    Biagi M, Vegni A M. Enabling high data rate VLC via MIMO-LEDs PPM. In: Proceedings of IEEE Globecom Workshops (GC Wkshps), Atlanta, 2013Google Scholar
  30. 30.
    Sugiyama H, Haruyama S, Nakagawa M. Brightness control methods for illumination and visible-light communication systems. In: Proceedings of ACM ICWMC, 2007Google Scholar
  31. 31.
    Lee K, Park H. Modulations for visible light communications with dimming control. IEEE Photonnic Technol Lett, 2011, 23: 1136–1138CrossRefGoogle Scholar
  32. 32.
    Lin W Y, Chen C Y, Lu H H, et al. 10 m/500 Mbps WDM visible light communication systems. Opt Express, 2012, 20: 9919CrossRefGoogle Scholar
  33. 33.
    Zhang Y Y, Yu H Y, Zhang J K. Block precoding for peak-limited MISO broadcast VLC: constellation-optimal structure and addition-unique designs. IEEE J Sel Areas Commun, 2018, 36: 78–90CrossRefGoogle Scholar
  34. 34.
    Zhang Y Y, Yu H Y, Zhang J K, et al. Energy-efficient space-time modulation for indoor MISO visible light communications. Opt Lett, 2016, 41: 329CrossRefGoogle Scholar
  35. 35.
    Chau J C, Morales C, Little T D C. Using spatial light modulators in MIMO visible light communication receivers to dynamically control the optical channel. In: Proceedings of the 2016 International Conference on Embedded Wireless Systems and Networks, Graz, 2016. 347–352Google Scholar
  36. 36.
    Gancarz J E, Elgala H, Little T D. Overlapping PPM for band-limited visible light communication and dimming. J Sol State Light, 2015, 2: 3CrossRefGoogle Scholar
  37. 37.
    Tian Z, Wright K, Zhou X. The darklight rises: visible light communication in the dark. In: Proceedings of ACM Mobicom, 2016Google Scholar
  38. 38.
    Schmid S, Richner T, Mangold S, et al. Enlighting: an indoor visible light communication system based on networked light bulbs. In: Proceedings of 13th Annual IEEE International Conference on Sensing, Communication, and Networking (SECON), London, 2016Google Scholar
  39. 39.
    Narendran N, Gu Y M. Life of LED-based white light sources. J Display Technol, 2005, 1: 167–171CrossRefGoogle Scholar
  40. 40.
    Pimputkar S, Speck J S, DenBaars S P, et al. Prospects for LED lighting. Nat Photonic, 2009, 3: 180–182CrossRefGoogle Scholar
  41. 41.
    Lin H N. Low power consumption LED emergency light. US patent, EP2023033A1 F21L4/04, 2009Google Scholar
  42. 42.
    Bullough J D, Yuan Z, Rea M S. Perceived brightness of incandescent and LED aviation signal lights. Aviat Space Environ Med, 2007, 78: 893–900Google Scholar
  43. 43.
    Tang Y Y, Chen Q, Ju P, et al. Research on load characteristics of energy-saving lamp and LED lamp. In: Proceedings of IEEE Powercon, 2016Google Scholar
  44. 44.
    Prince G B, Little T D C. On the performance gains of cooperative transmission concepts in intensity modulated direct detection visible light communication networks. In: Proceedings of IEEE International Conference on Wireless and Mobile Communications, 2010Google Scholar
  45. 45.
    Yasir M, Ho S W, Vellambi B N. Indoor positioning system using visible light and accelerometer. J Lightw Technol, 2014, 32: 3306–3316CrossRefGoogle Scholar
  46. 46.
    Li L Q, Hu P, Peng C Y, et al. Epsilon: a visible light based positioning system. In: Proceedings of ACM/USENIX NSDI, 2014Google Scholar
  47. 47.
    Hu P, Li L Q, Peng C Y, et al. Pharos: enable physical analytics through visible light based indoor localization. In: Proceedings of ACM HotNets-XII, 2014Google Scholar
  48. 48.
    Arai S, Mase S, Yamazato T, et al. Experimental on hierarchical transmission scheme for visible light communication using LED traffic light and high-speed camera. In: Proceedings of IEEE 66th Vehicular Technology Conference, 2007Google Scholar
  49. 49.
    Wang Q, Giustiniano D, Puccinelli D. Openvlc: software-defined visible light embedded networks. In: Proceedings of ACM Mobicom, 2014Google Scholar
  50. 50.
    Li T X, An C K, Xiao X R, et al. Real-time screen-camera communication behind any scene. In: Proceedings of ACM MobiSys, 2015Google Scholar
  51. 51.
    Hao T, Zhou R G, Xing G L. Cobra: color barcode streaming for smartphone systems. In: Proceedings of ACM MobiSys, 2012Google Scholar
  52. 52.
    Wang A R, Peng C Y, Zhang O Y, et al. Inframe: multiflexing full-frame visible communication channel for humans and devices. In: Proceedings of ACM HotNets-XIII, 2014Google Scholar
  53. 53.
    Schmid S, Mangold S, Richner T, et al. Linux light bulbs: enabling internet protocol connectivity for light bulb networks. In: Proceedings of ACM VLCS, 2015Google Scholar
  54. 54.
    Schmid S, Corbellini G, Mangold S, et al. Continuous synchronization for LED-to-LED visible light communication networks. In: Proceedings of IEEE IWOW, 2014Google Scholar
  55. 55.
    Gupta S, Chen K Y, Reynolds M S, et al. Lightwave: using compact fluorescent lights as sensors. In: Proceedings of ACM UBICOMP, 2011. 65–74Google Scholar
  56. 56.
    Schmidt D, Molyneaux D, Cao X. Picontrol: using a handheld projector for direct control of physical devices through visible light. In: Proceedings of ACM UIST, 2012Google Scholar
  57. 57.
    Zhou X, Campbell A T. Visible light networking and sensing. In: Proceedings of ACM HotWireless, 2014Google Scholar
  58. 58.
    Stefan I, Burchardt H, Haas H. Area spectral efficiency performance comparison between VLC and RF femtocell networks. In: Proceedings of IEEE International Conference on Communications (ICC), 2013Google Scholar
  59. 59.
    IEEE Standards Association. 802.15.7-2011 — IEEE Standard for Local and Metropolitan Area Networks-Part 15.7: Short-Range Wireless Optical Communication Using Visible Light. 978-0-7381-6665-0.
  60. 60.
    Stone P T. Review paper: fluorescent lighting and health. In: Proceedings of SAGE Lighting Research and Technology, 1992Google Scholar
  61. 61.
    Ndjiongue A R, Thokozani Shongwe, Ferreira H C, et al. Cascaded PLC-VLC channel using OFDM and CSK techniques. In: Proceedings of IEEE Globecom, 2015Google Scholar
  62. 62.
    Dabeer O, Chaudhuri S. Analysis of an adaptive sampler based on Weber’s law. IEEE Trans Signal Process, 2011, 59: 1868–1878MathSciNetCrossRefzbMATHGoogle Scholar
  63. 63.
    Brown A M, Dobson V, Maier J. Visual acuity of human infants at scotopic, mesopic and photopic luminances. Vision Res, 1987, 27: 1845–1858CrossRefGoogle Scholar
  64. 64.
    Jinno M, Morita K, Tomita Y, et al. Effective illuminance improvement of a light source by using pulse modulation and its psychophysical effect on the human eye. J Light Vis Env, 2008, 32: 161–169CrossRefGoogle Scholar

Copyright information

© Science China Press and Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.School of Computer Science and EngineeringNortheastern UniversityShenyangChina
  2. 2.School of Information TechnologyUniversity of CincinnatiCincinnatiUSA
  3. 3.School of Communication and Information EngineeringChongqing University of Posts and TelecommunicationsChongqingChina

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