UWB Channel Characterization for Compact L-Shape Configurations for Body-Centric Positioning Applications

Abstract

This paper presents an analysis on the body-centric channel parameters classification for various compact 3 base station L-Shape configurations utilizing only a 2D-plane for installation. Four different L-Shape configurations (x-z/y-z plane) are studied (facing-front/side/back) by varying the position of the base stations in an indoor environment. Results and analyses highlight the variation of the channel parameters with respect to the orientation of the base station configurations and presence of the human subject. Channel parameters values (peak power delay profile (PDP)/rms delay spread /Kurtosis ) are reported for (line of sight (LOS): -65 to -50 dB/0.5-5 nsec/40-60) and (non-line of sight (NLOS): -80 to -65 dB/ 10-25 nsec/ 5-25). The 3D localisation accuracy obtained is highest (1-3 cm) for the x-z plane L-Shape configuration facing-front which has maximum number of LOS links (70 %).The accuracy decreases by 1-2 cm for the x-z plane L-Shape configuration facing-back due to increase in NLOS links (70 %) between the wearable antennas and the base stations.

Wireless Body Sensor Communication Systems Based on UWB and IBC Technologies: State-of-the-Art and Open Challenges

“…Among aforementioned parameters, in the case of measurements on the human body, there are a few more parameters that have impact on the UWB radio channel. Besides demographic characteristics (sex, age), the human body position has impact on the radio channel, as well as measurement environment, antenna position and implants inside the human body [ 3 , 7 , 8 , 10 , 64 , 65 , 66 , 67 ]. In addition, it is necessary to classify the channel dependence on the position of systems during the experiment as a line-of-sight (LOS), non-line-of-sight (NLOS), or partial non-line-of-sight.…”

On-Body UWB Channel Classification and Characterization for Various Physical Exercises

“…The variable nature of the body during physical exercises forms different types of on-body channel characteristics leading to obstructed and non-obstructed links. Kurtosis is one such channel parameter which aids in evaluation of the channel in terms of LOS/NLOS, gives an idea of certain channel properties, hence, provides guidelines for the design and development of channel/time of arrival (TOA) estimation algorithms [14,30]. Kurtosis is mathematically defined as follows:…”

“…Among RF technologies, Ultra-Wideband (UWB) technology is very suitable for wearable communication applications such as human localization, tracking and activity monitoring [6][7][8][9][10]. UWB has attractive features such as fine time resolution, low cost, low power, robustness to multipath, compact antenna design and integration with other technologies [11][12][13][14]. An important aspect of the UWB body-centric communication is channel characterization of the wearable nodes which vary with different locations on the body, postures, and physical activities [15][16].…”

Tuning of dual frequency resonance analysis of circular and rectangular patch UWB antenna used for wireless sensor networks

“…An algorithm was developed for Multi-path components for positioning in wireless communication [24].Ultra-wide band beam forming was investigated for wireless sensor networks [25]. The base station indoor environment analysis made using L-shaped configuration with the variation of channel parameters [26]. The antenna designed and investigated for the visceral and subcutaneous fat layer analysis also the signal propagation through the tissues [27].In an large indoor environment the narrow band and wide band measurement analysis investigated for sensors in communication [28].Two dielectric substrate material techniques developed for the sensor node application [29].The antenna investigated for intra-body signal transmission analysis with the variation of channel impulse responses for medical applications [30].Algebraic space-time code developed for multi-band orthogonal frequency division multiplexing UWB system [31].…”