Experimental Characterization of the Color Quality and Error Rate for an Red, Green, and Blue-Based Light Emission Diode-Fixture Used in Visible Light Communications

Authors: Juan F. Gutierrez, Jesus M. Quintero, Diego Sandoval

Abstract:

An important feature of Lighting Emitting Diodes (LED) technology is the fast on-off commutation. This fact allows data transmission using modulation formats such as On-Off Keying (OOK) and Color Shift Keying (CSK). Since, CSK based on three color bands uses red, green, and blue monochromatic LED (RGB-LED) to define a pattern of chromaticities; this type of CSK provides poor color quality on the illuminated area. In this work, we present the design and implementation of a VLC system using RGB-based CSK with 16, 8, and 4 color points, mixing with a steady baseline of a phosphor white-LED, to improve the color quality of the LED-Fixture. The experimental system was assessed in terms of the Symbol Error Rate (SER) and the Color Rendering Index (CRI). Good color quality performance of the LED-Fixture was obtained with an acceptable SER. We describe the laboratory setup used to characterize and calibrate an LED-Fixture.

Keywords: Color rendering index, symbol error rate, color shift keying, visible light communications.

References:

[1] D. C. O’Brien, L. Zeng, H. Le-Minh, G. Faulkner, J. W. Walewski, and S. Randel, “Visible light communications: Challenges and possibilities,” in Personal, Indoor and Mobile Radio Communications, 2008. PIMRC 2008. IEEE 19th International Symposium on. IEEE, 2008, pp. 1–5.
[2] S. Dimitrov and H. Haas, Principles of LED Light Communications: Towards Networked Li-Fi. Cambridge University Press, 2015.
[3] L. A. N. Man, S. Committee, and I. Computer, IEEE Standard for Local and metropolitan area networks - Wireless Body Area Networks, 2012, vol. 2018, no. February.
[4] S. Gao, Performance study for indoor visible light communication systems. University of Ottawa (Canada), 2013.
[5] E. Monteiro and S. Hranilovic, “Design and implementation of color-shift keying for visible light communications,” Journal of Lightwave Technology, vol. 32, no. 10, pp. 2053–2060, 2014.
[6] R. Singh, “Physical layer techniques for indoor wireless visible light communications,” Ph.D. dissertation, University of Sheffield, 2015.
[7] R. J. Drost and B. M. Sadler, “Constellation design for color-shift keying using billiards algorithms,” 2010 IEEE Globecom Workshops, GC’10, pp. 980–984, 2010.
[8] B. Bai, Q. He, Z. Xu, and Y. Fan, “The color shift key modulation with non-uniform signaling for visible light communication,” 2012 1st IEEE International Conference on Communications in China Workshops, ICCC 2012, pp. 37–42, 2012.
[9] R. Singh, T. O’Farrell, and J. P. David, “An enhanced color shift keying modulation scheme for high-speed wireless visible light communications,” Journal of Lightwave Technology, vol. 32, no. 14, pp. 2582–2592, 2014.
[10] H. Chen, X. Z. Lai, P. Chen, Y. T. Liu, M. Y. Yu, Z. H. Liu, and Z. J. Zhu, “Quadrichromatic LED based mobile phone camera visible light communication,” Optics Express, vol. 26, no. 13, p. 17132, 2018.
[11] X. Liang, M. Yuan, J. Wang, Z. Ding, M. Jiang, and C. Zhao, “Constellation Design Enhancement for Color-Shift Keying Modulation of Quadrichromatic LEDs in Visible Light Communications,” Journal of Lightwave Technology, vol. 35, no. 17, pp. 3650–3663, 2017.
[12] N. Murata, Y. Kozawa, and Y. Umeda, “Digital Color Shift Keying with Multicolor LED Array,” IEEE Photonics Journal, vol. 8, no. 4, 2016.
[13] D. U. Campos-Delgado, J. Luna-Rivera, R. Perez-Jimenez, C. A. Guti´errez, V. Guerra, and J. Rabad´an, “Constellation design for color space-based modulation in visible light communications,” Physical Communication, vol. 31, pp. 154–159, 2018.
[14] R. A. Mart´ınez-Ciro, F. E. L´opez-Giraldo, A. F. Betancur-Perez, and J. M. Luna-Rivera, “Design and implementation of a multi-colour visible light communication system based on a light-to-frequency receiver,” Photonics, vol. 6, no. 2, 2019.