Indoor localization with ultra wideband radio
Date of Issue2012
School of Electrical and Electronic Engineering
Positioning and Wireless Technology Centre
Location-awareness has been drawing significant attention in recent years. In particular, the emerging Ultra Wideband (UWB) technology has the potential to revolutionize the systems and applications in many sectors. Due to its fine temporal resolution, UWB radio is especially promising for localization in indoor environment. This thesis focuses on two-step localization and investigates the UWB technology for indoor localization. Indoor environment often creates multipath in radio propagation, and the receiver receives multiple copies of UWB pulses with different delays and amplitudes. When the multipath signals are well-separated from each other, they can be resolved by conventional sliding correlator and do not interfere with the direct path (DP) signal. However, in a dense multipath channel, the subsequent multipath signal could overlap with the DP signal, which distorts the correlator output and introduces error in Time-of-Arrival (TOA) estimation. To measure the TOA accurately, more sophisticated algorithms are required to resolve the overlapping signal components. Most works in the literature adopt iterative approach to find the TOA of each signal components, and the convergence rate depends on the number of signal components.
DRNTU::Engineering::Electrical and electronic engineering::Wireless communication systems