Performance of a novel LED lamp arrangement to reduce SNR fluctuation for multi-user visible light communication systems.

This paper investigates the performance of our recently proposed LED lamp arrangement to reduce the SNR fluctuation from different locations in the room for multi-user visible light communications. The LED lamp arrangement consists of 4 LED lamps positioned in the corners and 12 LED lamps spread evenly on a circle. Our studies show that the SNR fluctuation under such a LED lamp arrangement is reduced from 14.5 dB to 0.9 dB, which guarantees that users can obtain almost identical communication quality, regardless of their locations. After time domain zero-forcing (ZF) equalization, the BER performances and channel capacities of 100-Mbit/s and 200-Mbit/s bipolar on-off-keying (OOK) signal with most significant inter-symbol interference (ISI) are very close to that of the channel without any ISI caused by this LED lamp arrangement.

[1]  Joseph M. Kahn,et al.  Wireless Infrared Communications , 1994 .

[2]  Thomas Kamalakis,et al.  Visible-light communication system enabling 73 Mb/s data streaming , 2010, 2010 IEEE Globecom Workshops.

[3]  K. Langer,et al.  Exploring the potentials of optical-wireless communication using white LEDs , 2011, 2011 13th International Conference on Transparent Optical Networks.

[4]  Changyuan Yu,et al.  A novel LED arrangement to reduce SNR fluctuation for multi-user in visible light communication systems , 2011, 2011 8th International Conference on Information, Communications & Signal Processing.

[5]  Joseph M. Kahn,et al.  Wireless Infrared Communications , 1994 .

[6]  Minglun Zhang,et al.  Mathematic models for a ray tracing method and its applications in wireless optical communications. , 2010, Optics express.

[7]  Chang-Soo Park,et al.  White LED ceiling lights positioning systems for optical wireless indoor applications , 2010, 36th European Conference and Exhibition on Optical Communication.

[8]  Yunje Oh,et al.  Improvement of Date Rate by using Equalization in an Indoor Visible Light Communication System , 2008, 2008 4th IEEE International Conference on Circuits and Systems for Communications.

[9]  Harald Haas,et al.  OFDM Visible Light Wireless Communication Based on White LEDs , 2007, 2007 IEEE 65th Vehicular Technology Conference - VTC2007-Spring.

[10]  B. Inan,et al.  Impact of Nonlinear LED Transfer Function on Discrete Multitone Modulation: Analytical Approach , 2009, Journal of Lightwave Technology.

[11]  Masao Nakagawa,et al.  Fundamental analysis for visible-light communication system using LED lights , 2004, IEEE Transactions on Consumer Electronics.

[12]  P. Winzer,et al.  Capacity Limits of Optical Fiber Networks , 2010, Journal of Lightwave Technology.