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Pulsed ultrawideband (UWB) signaling is widely used in indoor localization networks, in which data communications often occur concurrently. The receivers in such a network often have different complexity, performance, and energy consumption requirements. The goal of this paper is to design a coded-reference (CR) UWB scheme that enables simultaneous data transmission and high-precision localization...
In this paper, a three-dimensional (3-D) ultra-wideband time-of-arrival localization scheme that employs a single cluster of receivers is studied. The receivers are placed on a two-dimensional plane within a few decimeters, and no wireless synchronization is required among the receivers. The optimum 3-D receiver placement is analyzed in the sense of minimum estimation variance defined by the Cramér-Rao...
We describe a centimeter-accuracy, three-dimensional ultra-wideband localization system for applications in a dense-multipath environment. From experimental results, we provide an in-depth analysis of the technical challenges toward realizing a robust, high-precision system: angle-dependent received waveform distortion and path-overlap. Specifically, for a realistic configuration (receiver placement,...
The accuracy of time-difference-of-arrival (TDOA) ultra-wideband (UWB) localization system depends mainly on two factors: the receiver geometric configuration and the TDOA measurement accuracy. In this paper, we analyze the geometric dilution of precision (GDOP) of TDOA localization when the receiver geometric configurations are near optimum. The analytical relationship between the GDOP and the number...
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