Contribution à l'étude de la détection des signaux UWB. Etude et implémentation d'un récepteur ad hoc multicapteurs. Applications indoor de localisation

Cette thèse s inscrit dans le projet de communication à proximité aux départements Electronique et Physique et Communications, Images et Traitement de l Information de l Institut Télécom Sud Paris. Le projet comporte la mise au point d un récepteur basé sur une méthode de détection pseudo-cohérente des signaux Ultra Large Bande à double impulsion (TR-UWB), méthode désignée par Time Delayed Sampling and Correlation (TDSC). La première partie de ce document comporte la réalisation d une plate-forme modulaire de communication UWB basée sur le système de détection TDSC. Cette plate-forme comporte une puce CMOS 0.35 m conçue précédemment au laboratoire EPH. Elle offre la possibilité d enregistrer des signaux TR-UWB réels et de réaliser des tests de fonctionnement. La deuxième partie est une étude approfondie du récepteur utilisant la méthode TDSC. La détection des signaux UWB et la procédure de synchronisation sont évalués en utilisant les signaux réels acquis à partir de la plate-forme. Un ensemble de tests ont été menés avec des signaux en bande de base et des signaux transposés en fréquence, dans les deux cas en transmission sur câble puis par radio. Les résultats ont permis de valider la détection et le principe de la synchronisation. La troisième partie est une proposition d estimation de la distance entre deux dispositifs d un réseau radio UWB utilisant un récepteur TDSC, pour une localisation en intérieur. L étude fait la synthèse de plusieurs propositions et expérimentations et conduit à la définition des meilleurs critères pour une mesure du temps d arrivée (TOA) et son implémentation pratique sur un récepteur TDSCThis thesis is part of the Electronics and Physics (EPH) department s research work at Institut Telecom SudParis in collaboration with the Information, Images and Information Processing (CITI) Department. The project included the development of a receiver architecture called Time Delayed Sampling and Correlation (TDSC) that works with Transmitted Reference Ultra Wideband signals (TR-UWB), and which could achieve a good performance without channel estimation. The first part of this work included the design of a modular UWB communication system based on the TDSC method. This platform uses a 0.35 m CMOS chip conceived by the EPH laboratory. This gives the possibility to record real TR-UWB signals and to achieve functional tests. A second part of the thesis was to deepen the use of the TDSC method for detection of UWB signals and the synchronization procedure of the receiver using real signals acquired by the platform. A series of tests were conducted in this regard by using baseband signals as well as frequency translated signals, through cable channels and radio transmission. The results let us validate the TDSC detection and the synchronization procedure. Finally, a third line of work was the study and development of a distance estimation proposal based on the time of arrival (TOA) of TR-UWB signals, for indoor localization purposes. The study included a synthesis of several proposals and experimental works. Simulations were made and compared with other methods. Experimental results and their good convergence with the simulations let conclude that the proposal is a feasible solution to the measurement of the TOA, based on a TR-UWB receiver with low-complexity architectureEVRY-INT (912282302) / SudocSudocFranceF

An Experimental Approach to a Low-Complexity Two-Step TOA Measurement for TR-UWB Signals

International audienceA proposal for a two-step time of arrival (TOA) estimation based on the Time Delayed Sampling and Correlation (TDSC) method for Transmitted Reference Ultra-wideband (TR-UWB) signals is presented and experimentally tested in a wireless environment. It relies on the sliding correlation over a symbol length, at the coarse step, to find a signal block where the direct path is enclosed. At the second step, the sliding correlation is finely evaluated over this signal block to estimate precisely the beginning of the pulse. The TOA is then evaluated with a high resolution obtained from the relatively high sampling frequency of the metal-oxide semiconductor circuit (CMOS) that implements the TDSC method. This TOA estimator structure is simple, feasible and with a low computing demand

TR-UWB detection and synchronization -- Using the Time Delayed Sampling and Correlation detection method

International audienceThis paper presents the experimental results of the transmitted reference Ultra-Wideband signals (TR-UWB) detection using a prototype system. The system is based on the 'Time Delayed Sampling and Correlation' (TDSC) detection method and its implementation on a 0.35 CMOS chip with a sampling frequency as high as 7.5 GHz. This platform allows the evaluation of the circuit performance and validates the first synchronization process stage. Detection of such signals has been successfully carried out through an indoor wireless channel, under line of sight (LOS) and non line of sight (NLOS) measurement conditions, both in the sub GHz band (group 1) and low band UWB signals. Simulation of the synchronization process using the received signals was successfully accomplished

EXPERIMENTAL VALIDATION FOR TR-UWB SYSTEMS By Time Delayed Sampling & Correlation (TDSC)

International audienceDetection results of transmitted reference ultra-wideband signals (TR-UWB) are presented. The signals are received through the implementation in CMOS technology of the 'Time Delayed Sampling and Correlation' (TDSC) detection method, which allows the test of its performance and validates the first stage of the synchronization process. This method has been proposed to achieve a UWB system with low cost, low complexity and low power consumption for medium to low data rate applications such as ranging or localization. Detection of such signals has been done successfully in both a direct cable connection as well in a wireless system with a real channel. In both cases they were used in the sub GHz band (group1) and also in the low band UWB signals

A fast low-cost TOA estimation for UWB impulse radio networks

International audienceA time of arrival (TOA) estimation method for a Transmitted Reference Ultra-wideband (TR-UWB) receiver is presented and experimentally tested in a wireless environment. The receiver uses the low-complexity Time Delayed Sampling and Correlation (TDSC) method and prototype circuit. The two-step estimation proposal relies first on the sliding correlation over a symbol length, at the coarse step, to find a signal block where the direct path is enclosed, and at the second step, the sliding correlation is more finely evaluated over this signal block to estimate precisely the beginning of the pulse. Here the TOA can be evaluated with a high resolution obtained from the relatively high sampling frequency of the metal-oxide semiconductor circuit (CMOS) that implements the TDSC method. This TOA estimator structure is simple, feasible and with a low computing demand, suited for fast mobile localization