Indoor positioning using a-SiC:H technology
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Indoor positioning using a-SiC:H technology M. A. Vieira1,2, M. Vieira1,2,3,V. Silva1,2, P. Louro1,2, L. Mateus1, P. Vieira1 1
Electronics Telecommunication and Computer Dept. ISEL, R. Conselheiro Emídio Navarro, 1949-014 Lisboa, Portugal Tel: +351 21 8317290, Fax: +351 21 8317114, [email protected] ; 2 CTS-UNINOVA, Quinta da Torre, Monte da Caparica, 2829-516, Caparica, Portugal. 3 DEE-FCT-UNL, Quinta da Torre, Monte da Caparica, 2829-516, Caparica, Portugal ABSTRACT The nonlinear property of SiC multilayer devices under Ultra Violet (UV) irradiation is used to design an optical processor for indoor positioning. The transducers combine the simultaneous demultiplexing operation with the photodetection and self-amplification. Moreover, we present a way to achieve indoor positioning using the parity bits and the navigation syndrome. A 4 bit representation with the original string colour message and the transmitted 7 bit string, the encoding and decoding accurate positional information processes and the design of SiC navigation syndrome generators are discussed. The visible multilateration method estimates the device’s position by using the MUX signal received from several, non-collinear transmitters. The location and motion information is found by mapping position and estimates the location areas. INTRODUCTION Visible Light Communication (VLC), using Light Emitting Diodes (LEDs) has become a promising technology for wireless communications [1]. Due to the combination of illumination and communication, many investigations have been attracted such as indoor high-speed wireless access and positioning [2, 3]. RGB-LEDs, compared with phosphor-based LEDs, are more promising solutions, as they offer the possibility to perform Wavelength Division Multiplexing (WDM) which can greatly increase the transmission data rate. In the past, we have developed a WDM device that enhances the transmission capacity in the visible range. The device was based on a tandem a-SiC:H/a-Si:H pin/pin light controlled filter. Additionally, when different visible signals are encoded in the same optical transmission path [4, 5], the device multiplexes the different optical channels, performs different filtering processes, and finally decodes the encoded signals, recovering the transmitted information. This paper analyses the VLC system characteristics for positioning on its different components such as the transmitter and the receiver, the multiplexing techniques, the visible light sensing and lastly, the applications, such as indoor localization and motion recognition. SYSTEM DESIGN Transmitter The system is a self-positioning system in which the measuring unit is mobile. This unit receives the signals from several transmitters in known locations, and has the capability to compute its location based on the measured signals. For data transmission we used commercially available RGB-LEDs whose spectra is displayed in Figure 1a. The estimate distance can be used
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