Percorrer por autor "Mateus, L."
A mostrar 1 - 2 de 2
Resultados por página
Opções de ordenação
- Indoor positioning system using a WDM device based on a-SiC H technologyPublication . Vieira, Manuel; Vieira, Manuela; Louro, Paula; Mateus, L.; Vieira, R.In this paper, we present an indoor positioning system were trichromatic white LEDs are used as transmitters and an optical processor based on a-SiC:H technology as mobile receiver. The optical processor is realized using a double p-i-n photodetector with two UV light biased gates. The relationship between the optical inputs (transmitted data) and the corresponding digital output levels (received data) is established and decoded. The received signal is used in coded multiplexing techniques for supporting communications and navigation concomitantly on the same channel. The position of the device is estimated using the visible multilateration method through the strength of the signal received from several non-collinear transmitters. The location and motion information is found by mapping position and estimates the location areas. Since the indoor position and transmitted data of the different LED light sources is known from building floor plans and lighting plans, the corresponding transmitted data information, indoor position and travel direction of the mobile device can be determined
- Indoor positioning using a-SiC:H technologyPublication . Vieira, Manuel; Vieira, Manuela; Vaz da Silva, V; Louro, Paula; Mateus, L.; Vieira, PedroThe 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.