Title: Hierarchical scheme for detecting the rotating MIMO transmission of the in-door RGB-LED visible light wireless communications using mobile-phone camera
Authors: Chen, Shih-Hao
Chow, Chi-Wai
Department of Photonics
Keywords: Visible light communication (VLC);Optical wireless communication (OW);Multiple-input and multiple-output (MIMO)
Issue Date: 15-Jan-2015
Abstract: Multiple-input and multiple-output (MIMO) scheme can extend the transmission capacity for the lightemitting-diode (LED) based visible light communication (VLC) systems. The MIMO VLC system that uses the mobile-phone camera as the optical receiver (Rx) to receive MIMO signal from the n x n Red-GreenBlue (RGB) LED array is desirable. The key step of decoding this signal is to detect the signal direction. If the LED transmitter (Tx) is rotated, the Rx may not realize the rotation and transmission error can occur. In this work, we propose and demonstrate a novel hierarchical transmission scheme which can reduce the computation complexity of rotation detection in LED array VLC system. We use the n x n RGB LED array as the MIMO Tx. In our study, a novel two dimensional Hadamard coding scheme is proposed. Using the different LED color layers to indicate the rotation, a low complexity rotation detection method can be used for improving the quality of received signal. The detection correction rate is above 95% in the indoor usage distance. Experimental results confirm the feasibility of the proposed scheme. (C) 2014 Elsevier B.V. All rights reserved
URI: http://dx.doi.org/10.1016/j.optcom.2014.09.042
ISSN: 0030-4018
DOI: 10.1016/j.optcom.2014.09.042
Volume: 335
Begin Page: 189
End Page: 193
Appears in Collections:Articles