Positioning System based on DTMB: Design, Laboratory Test and Field Trial Compared with Global Navigation Satellite System (GNSS) which has been deeply studied and widely applied, the systems based on digital terrestrial television broadcasting (DTTB) for positioning need to be further studied. A positioning system based on digital television terrestrial multimedia broadcasting(DTMB) system is well designed and implemented on FPGA in this paper. The designed postioning system is based on time difference of arrival (TDOA) measurements. Laboratory trial results show that the proposed system can provide accurate positioning results when the signaltonoise ratio (SNR) is above 8 dB. Field trial results prove that the positioning error is less than 10 meters under lineofsight (LOS) channels.

FPGAbased Implementation of a RealTime Distance Evaluation Algorithm for Wireless Localization Systems The work introduces the FPGA implementation of a novel highprecision TDOA distance evaluation system based on a OFDM symbol that is completely charaterized, generated, and processed in the digital domain. The system exploits a SoftwareDefined Radio architeture, thus its charateristics can be adjusted by means of simple software modifications performed on the FPGA. The system was implemented using the FPGA (Cyclone IVE EP4CE115F29C8L) available through the Alterau0027s DE2115 development board. The FPGA implementation comprises a digital hardware, that extracts the distance by processing the incoming signal in both the time and frequency domains, and a NIOS processor to transmit the elaborated data to a main central microcontroller unit (MCU). The implementation requires about 120k bits of memory and 44k logic elements (of which about 30k are registers).