Title: Utilization of multi-band OFDM modulation to increase traffic rate of phosphor-LED wireless
Authors: Yeh, Chien-Hung
Chen, Hsing-Yu
Chow, Chi-Wai
Liu, Yen-Liang
Department of Photonics
Issue Date: 26-Jan-2015
Abstract: To increase the traffic rate in phosphor-LED visible light communication (VLC), a multi-band orthogonal frequency division multiplexed (OFDM) modulation is first proposed and demonstrated. In the measurement, we do not utilize optical blue filter to increase modulation bandwidth of phosphor-LED in the VLC system. In this proposed scheme, different bands of OFDM signals are applied to different LED chips in a LED lamp, this can avoid the power fading and nonlinearity issue by applying the same OFDM signal to all the LED chips in a LED lamp. Here, the maximum increase percentages of traffic rates are 41.1%, 17.8% and 17.8% under received illuminations of 200, 500 and 1000 Lux, respectively, when the proposed three-band OFDM modulation is used in the VLC system. In addition, the analysis and verification by experiments are also performed. (C) 2015 Optical Society of America
URI: http://dx.doi.org/10.1364/OE.23.001133
ISSN: 1094-4087
DOI: 10.1364/OE.23.001133
Volume: 23
Begin Page: 1133
End Page: 1138
Appears in Collections:Articles