Modeling the impact of node speed on the ranging estimation with UWB body area networks

Abstract

The purpose of this paper is to evaluate the impact of the node speed on the ranging estimation for location applications with Wireless Body Area Networks (WBAN). While estimated with the 3-Way ranging protocol (3-WR) , this distance between two nodes placed on the body can be affected by the human movements. Thus, we study theoretically the ranging error with the 3-WR, based on a perfect channel, a MAC layer based on TDMA using two scheduling strategies (Single node localization (P2P-B) and Aggregated & Broadcast (A&B)) and a PHY layer based on Ultra Wideband (IR-UWB). We demonstrate the accuracy of the model, and show that the distance error is highly correlated with the speed of nodes, while the associated mobility model has an impact on the design of MAC strategies by simulation.

Impulse Radio Ultra-Wideband Communications for Localization and Tracking of Human Body and Limbs Movement for Healthcare Applications

“…For BS4, most of the antennas locations are in NLOS with the receiver, hence low Kurtosis index values (8)(9)(10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) are observed. Highest values are observed for antennas placed on the wrist with respect to BS1 during sideways movements.…”

“…Among radio frequency (RF) technologies, the ultra-short pulse UWB (3.1 to 10.6 GHz) based systems enables high localisation accuracy and have several advantages such as low cost, low power, high data rate, portability, integration with other technologies (such as MEMS, inertial) and can carry signals through many obstacles in comparison to narrowband systems [10][11][12]. Commercial UWB localisation systems have reported an accuracy of 10 -15 cm with an operating range of around 50 m [12].…”