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Abstract
Multipath dispersion results from optical signals passing through more than one path. In this paper, we investigate a non-directed line of sight (LOS) model using white light emitting diode illumination. Typically in such a link, the optical signals are modeled as a reflection component and a directed LOS component over optical wireless (OW) channels. However, inter-symbol interference (ISI) induced by multipath dispersion critically influences the performance of OW communications. In this paper, we propose the adaptive minimum mean squared error (MMSE) equalizer scheme to suppress the multipath ISI, since this scheme can minimize the mean square error (MSE) between the desired equalizer output and the actual equalizer output. We compared the following two algorithms: Least mean square and recursive least square. Our computer simulations demonstrated that visible light communication using an adaptive MMSE equalizer can alleviate the serious effects of optical multipath dispersion.
Additional information
Notes on contributors
Ying Yi
Ying Yi received the B.S degree in Information Technology from HeBei Normal University, in HeBei Province, China, and M.Eng. degrees from the Department of Electronics and Radio Engineering, Kyung Hee University, Korea, in 2008 and 2010, respectively. Currently, he is a research associate with Department of Electronics and Radio Engineering, Kyung Hee University, Korea. Meanwhile, he is doing the projects for IT Research and Development Program of the Korean Ministry of Knowledge Economy and Korea Evaluation Institute of Industrial Technology (MKE/KEIT) as a researcher. His research interests are optical wireless communication systems, Ad-hoc/Mesh network, and LTE.
E-mail: [email protected]
Changping Li
Changping Li received the B.Eng degree in Biomedical engineering from Jiamusi University, Hei Longjiang province, China, in 2008. She is currently pursuing the Ph.D. degree at Department of Electronics and Radio Engineering, Kyung Hee University, Korea. Her current research interests include: Diversity technology, Optical wireless communication, OFDM and MC-CDMA.
E-mail: [email protected]
Kyesan Lee
Kyesan Lee received a B.E. degree in electrical engineering from Kyung Hee University in Korea and M.S. and Ph.D. degrees from the department of electrical engineering, Keio University, Yokohama, Japan, in 1996, 1999, and 2002, respectively. He joined KDDI R–D Laboratories Inc in 2002 and has received a IEEE VTS Japan young researchers encouragement award. Since 2003, he has been with the College of Electronic and Information, Kyung Hee University, where he is a Professor. He received the excellent paper award in 2009 IEEE ISCIT (International symposium on communication and information technology). He has received the Prime minister award 2009. He received also the minister award of ministry of education science and technology in 2009. His research interests include wireless communication networks, CDMA, OFDM, MC-CDMA, MC-DS/CDMA, MIMO, and Cognitive radio and Visible light communication systems.
E-mail: [email protected]