© The Institution of Engineering and Technology
In this study, a compact design of a highly efficient, and a high luminosity light-emitting diode (LED)-based visible light communications system is presented, which is capable of providing standard room illumination levels and also wide-coverage Ethernet 10BASE-T optical wireless downlink communications over a distance of 2.3 m using commercial white light phosphor LEDs. The measured signal-to-noise ratio of the designed Ethernet system is >45 dB, thus allowing error-free communications with both on–off keying non-return zero and differential Manchester-coded modulation schemes at 10 Mbps. The uplink has been provided via a wireless infra-red link. A comparative study of a point-to-point wired local area network (LAN) and the optical wireless link confirms no discernible differences between them. The design of the transmitter is also shown to be scalable, with the frequency response for driving 25 LEDs being almost the same as driving a single LED. LED driving units are designed to match with the Ethernet sockets (RJ45) that conform to the existing LAN infrastructures (building and portable devices).
References
-
-
1)
-
J. Grubor ,
S. Randel ,
K.-D. Langer ,
J.W. Walewski
.
Broadband information broadcasting using LED-based interior lighting.
J. Lightwave Technol.
,
24 ,
3883 -
3892
-
2)
-
3)
-
13. Fang-Ming, W., Chun-Ting, L., Chia-Chien, W., Cheng-Wei, C., Hou-Tzu, H., Chun-Hung, H.: ‘1.1-Gb/s white-LED-based visible light communication employing carrier-less amplitude and phase modulation’, IEEE Photon. Technol. Lett., 2012, 24, pp. 1730–1732 (doi: 10.1109/LPT.2012.2210540).
-
4)
-
24. Le Minh, H., Ghassemlooy, Z., Burton, A., Haigh, P.A.: ‘Equalization for organic light emitting diodes in visible light communications’. 2011 IEEE GLOBECOM Workshops (GC Workshops), 2011, pp. 828–832.
-
5)
-
4. Zeng, L.: ‘Indoor optical wireless communications using white light LEDs’. , University of Oxford, 2009.
-
6)
-
21. Haigh, P.A., Son, T.T., Bentley, E., Ghassemlooy, Z., Le Minh, H., Chao, L.: ‘Development of a visible light communications system for optical wireless local area networks’. Computing, Communications and Applications Conf. (ComComAp), 2012, pp. 351–355.
-
7)
-
10. Vucic, J., Kottke, C., Nerreter, S., et al: ‘230 Mbit/s via a wireless visible-light link based on OOK modulation of phosphorescent white LEDs’. 2010 Conf. Optical Fiber Communication (OFC), collocated National Fiber Optic Engineers Conf. (OFC/NFOEC), 2010, pp. 1–3.
-
8)
-
11. Vucic, J., Kottke, C., Nerreter, S., Langer, K., Walewski, J.W.: ‘513 Mbit/s visible light communications link based on DMT-modulation of a white LED’, J. Lightw. Technol., 2010, 28, pp. 3512–3518.
-
9)
-
15. Ghassemlooy, Z., Popoola, W., Rajbhandari, S.: ‘Optical wireless communications: system and channel modelling’ (CRC Press Inc., 2012).
-
10)
-
11)
-
8. Haruyama, S.: ‘Progress of visible light communication’. 2010 Conf. Optical Fiber Communication (OFC), Collocated National Fiber Optic Engineers Conf. (OFC/NFOEC), 2010, pp. 1–3.
-
12)
-
28. Paudel, R., Ghassemlooy, Z., Le-Minh, H., Rajbhandari, S., Livingstone, B.: ‘Investigation of FSO ground-to-train communications in a laboratory environment’. 2011 Second Asian Himalayas Int. Conf. Internet (AH-ICI), 2011.
-
13)
-
14)
-
15)
-
3. Zeng, L., Hoa Le, M., O'Brien, D., et al: ‘Equalisation for high-speed visible light communications using white-LEDs’. Sixth Int. Symp. on Communication Systems, Networks and Digital Signal Processing, 2008 (CNSDSP 2008), 2008, pp. 170–173.
-
16)
-
17)
-
27. Soclof, S.: ‘Design and applications of analogue integrated circuits’ (Prentice-Hall International, Inc., California, 1991).
-
18)
-
H. Le Minh ,
D. O'Brien ,
G. Faulkner ,
L. Zeng ,
L. Lee ,
D. Jung ,
Y. Oh ,
E.T. Won
.
100-Mb/s NRZ visible light communications using a postequalized white LED.
IEEE Photonics Technol. Lett.
,
1063 -
1065
-
19)
-
20)
-
23. Le-Minh, H., O'Brien, D., Faulkner, G., et al: ‘80 Mbit/s visible light communications using pre-equalized white LED’. 34th European Conf. Optical Communication, 2008 (ECOC 2008), 2008, pp. 1–2.
-
21)
-
17. Fath, T., Heller, C., Haas, H.: ‘Optical wireless transmitter employing discrete power level stepping’, J. Lightw. Technol., 2013, 31, pp. 1734–1743 (doi: 10.1109/JLT.2013.2257984).
-
22)
-
12. Khalid, A.M., Cossu, G., Corsini, R., Choudhury, P., Ciaramella, E.: ‘1-Gb/s transmission over a phosphorescent white LED by using rate-adaptive discrete multitone modulation’, IEEE Photon. J., 2012, 4, pp. 1465–1473.
-
23)
-
2. Grubor, J., Lee, S.C.J., Langer, K.-D., Koonen, T., Walewski, J.W.: ‘Wireless high-speed data transmission with phosphorescent white-light LEDs’. 33rd European Conf. and Exhibition of Optical Communication – Post-Deadline Papers (published 2008), 2007, pp. 1–2.
-
24)
-
25. Zeyu, W., Chau, J., Little, T.: ‘Modeling and designing of a new indoor free space visible light communication system’. 16th European Conf. Networks and Optical Communications (NOC), 2011, pp. 72–75.
-
25)
-
26)
-
16. Kishi, T., Tanaka, H., Umeda, Y., Takyu, O.: ‘A high-speed LED driver that sweeps out the remaining carriers for visible light communications’, J. Lightw. Technol., 2013, 32, pp. 239–249 (doi: 10.1109/JLT.2013.2292896).
-
27)
-
22. Zimer, R.E., Tranter, W.H.: ‘Principles of communications’ (Houghton Mifflin Company, Boston, 1990, 3rd edn.).
-
28)
-
20. Le-Minh, H., O'Brien, D., Faulkner, G., et al: ‘High-speed visible light communications using multiple-resonant equalization’, IEEE Photon. Technol. Lett., 2008, 20, pp. 1243–1245 (doi: 10.1109/LPT.2008.926030).
-
29)
-
1. Heffernan, B., Frater, L., Watson, N.: ‘LED replacement for fluorescent tube lighting’. Power Engineering Conf., , 2007, pp. 1–6.
http://iet.metastore.ingenta.com/content/journals/10.1049/iet-cds.2013.0359
Related content
content/journals/10.1049/iet-cds.2013.0359
pub_keyword,iet_inspecKeyword,pub_concept
6
6