Speaker: Andrea Biral, Date: 18th of March 2016, Time: 14:30, Room: 318 (third floor of DEI/G building)
Abstract: Over the coming decades, high-definition situationally-aware networks have the potential to create revolutionary applications in the social, scientific, commercial, and military sectors. Ultrawide bandwidth (UWB) technology is a viable candidate for enabling accurate localization capabilities through time-of-arrival (TOA)-based ranging techniques.
These techniques exploit the fine delay resolution property of UWB reference signals by estimating the TOA of the first signal path. In this presentation we first describe the fundamental TOA bounds (such as the Cramer-Rao bound) in an ideal single-path environment. This bound serve as useful benchmark in assessing the performance of TOA estimation techniques and, based on its analysis, we propose a solution to improve the accuracy of the ToA estimation of a signal by simply working on its shape. In particular, we show that, modulating the reference signal with a specific carrier frequency, we can reduce variance of the ToA estimation up to one order of magnitude with respect to the traditional signal processing operated at base band.