NLOS identification and mitigation for localization based on UWB experimental data

Abstract--Sensor networks can benefit greatly from locationawareness, since it allows information gathered by the sensors to be tied to their physical locations. Ultra-wide bandwidth (UWB) transmission is a promising technology for location-aware sensor networks, due to its power efficiency, fine delay resolution, and robust operation in harsh environments. However, the presence of walls and other obstacles presents a significant challenge in terms of localization, as they can result in positively biased distance estimates. We have performed an extensive indoor measurement campaign with FCC-compliant UWB radios to quantify the effect of non-line-of-sight (NLOS) propagation. From these channel pulse responses, we extract features that are representative of the propagation conditions. We then develop classification and regression algorithms based on machine learning techniques, which are capable of: (i) assessing whether a signal was transmitted in LOS or NLOS conditions; and (ii) reduci...

• Type: Journal
• Year: 2010
• Where: JSAC
• Authors: Stefano Maranò, Wesley M. Gifford, Henk Wymeersch, Moe Z. Win
• Keywords: JSAC 2010, Location-aware Sensor Networks, NLOS Conditions, Sensor Networks