Multi Detector Fusion of Dynamic TOA Estimation using Kalman Filter

In this paper, we propose fusion of dynamic TOA (time of arrival) from multiple non-coherent detectors like energy detectors operating at sub-Nyquist rate through Kalman filtering. We also show that by using multiple of these energy detectors, we can achieve the performance of a digital matched filter implementation in the AWGN (additive white Gaussian noise) setting. We derive analytical expression for number of energy detectors needed to achieve the matched filter performance. We demonstrate in simulation the validity of our analytical approach. Results indicate that number of energy detectors needed will be high at low SNRs and converge to a constant number as the SNR increases. We also study the performance of the strategy proposed using IEEE 802.15.4a CM1 channel model and show in simulation that two sub-Nyquist detectors are sufficient to match the performance of digital matched filter

IR-UWB Detection and Fusion Strategies using Multiple Detector Types

Optimal detection of ultra wideband (UWB) pulses in a UWB transceiver employing multiple detector types is proposed and analyzed in this paper. We propose several fusion techniques for fusing decisions made by individual IR-UWB detectors. We assess the performance of these fusion techniques for commonly used detector types like matched filter, energy detector and amplitude detector. In order to perform this, we derive the detection performance equation for each of the detectors in terms of false alarm rate, shape of the pulse and number of UWB pulses used in the detection and apply these in the fusion algorithms. We show that the performance can be improved approximately by 4 dB in terms of signal to noise ratio (SNR) for perfect detectability of a UWB signal in a practical scenario by fusing the decisions from individual detectors.Comment: Accepted for publishing in IEEE WCNC 201

The Rules of Competition Within the European Common Market

Ultra wideband (UWB) radio for communication has several challenges. From the physical layer perspective, asignaling technique should be optimally designed to work in synergy with the underneath hardware to achievemaximum performance. In this paper, we propose a variant of pulse position modulation (PPM) for physical layersignaling, which can achieve raw bitrate in excess of 150 Mbps on a low complexity in-house developed impulseradio UWB platform. The signaling system is optimized to maximize bitrate under practical constraints of lowcomplexity hardware and regulatory bodies. We propose a detector and derive its theoretical performance boundsand compare the performance in simulation in terms of symbol error rates (SER). Modifications to the signaling, whichcan increase the range by 4 times with a slight increase in hardware complexity, is proposed. Detectors for thismodification and a comparative study of the performance of the proposed UWB physical layer signaling schemes interms of symbol error rates are discussed.QC 20141023</p

Investigation of variety of non-coherent front end detectors for timing estimation

La localización en interiores de usuarios móviles es actualmente un tema central para muchas aplicaciones y campos, incluidas las redes de sensores, gestión de activos, asistencia sanitaria y localización de personal de seguridad pública. Las soluciones existentes se basan a menudo en la fusión de la información de múltiples sensores. La posibilidad de utilizar un sistema de banda ultra ancha (UWB) para la medición inalámbrica de distancias basada en el tiempo de ida y vuelta (RTT) se ha investigado en este proyecto final de carrera. Los receptores UWB no coherentes se han analizado utilizando dos enfoques diferentes: la detección de la amplitud y la detección de la energía. Para el análisis, se desarrolla un estudio teórico y también se han realizado diversas simulaciones. Además, ambos receptores UWB no coherentes han sido diseñados e implementados. Por otra parte, un método ha sido propuesto para permitir la reconstrucción de un pulso UWB a partir del submuestreo de una ráfaga de pulsos UWB y tratar de aproximar el rendimiento óptimo del receptor UWB ideal. Las simulaciones producen resultados interesantes en cuanto al rendimiento de la estimación de RTT. Ambas técnicas de detección se comparan, describiendo las ventajas y desventajas de cada uno

Schedule-based sequential localization in asynchronous wireless networks

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