Analyzing human body shadowing at 60 GHz: Systematic wideband MIMO measurements and modeling approaches

Abstract

This paper presents results of a systematic 2 × 2 MIMO channel measurement campaign, which has been carried out in order to analyze the impact of human body shadowing (HBS) on the 60 GHz wideband channel. A piecewise linear and two analytical models, namely the double knife-edge (DKE) model and a cylinder approach incorporating the uniform theory of diffraction (UTD), are used to approximate and to predict the measurement curves. We propose measures to quantify the degree of match between attenuation curves in the millimeter wave frequency band and use them to evaluate the model results with respect to different scenario groups. The presented results are beneficial to refine existing diffraction models regarding the prediction of HBS effects.

A statistical model for the shadowing induced by human bodies in the proximity of a mmWaves radio link

“…Since the shadowing represents a fluctuation of the received power with respect to the reference power, it can be either positive or negative. Many studies about the effect of the human body on millimeter-waves propagation explained this behavior as the effect of diffraction [21]. It is worth to notice that this behavior appears to be strongly dependent on the carrier frequency.…”

“…the additional shadowing is almost predictable especially for the first Gaussian (solid lines). Fluctuations appear positive or negative, due to the phenomenon of diffraction [21]. At higher frequencies the additional shadowing becomes significant with an increased variance.…”

“…The TG3c model covers residential, office, library, desktop, and kiosk environments, whereas the TGad model covers conference room, living room, and cubicle. As human shadowing is a severe problem for wireless indoor mmWaves communications, large effort has been devoted to the characterization of this phenomenon [17], [21], [22]. Available models mainly focus on the characterization of the blockage of the line-of-sight (LoS) and the temporal evolution due to one person crossing through the radio link [21].…”

“…As human shadowing is a severe problem for wireless indoor mmWaves communications, large effort has been devoted to the characterization of this phenomenon [17], [21], [22]. Available models mainly focus on the characterization of the blockage of the line-of-sight (LoS) and the temporal evolution due to one person crossing through the radio link [21]. Due to propagation phenomena, like diffraction and reflection, 60 GHz radio links are influenced not only by the LoS blockage, but also by the presence of people in the proximity, even if they are in quasi-stationary conditions.…”

Secure and Connected Wearable Intelligence for Content Delivery at a Mass Event: A Case Study

“…Multiple 3D rays (or beams) outgoing from the transmitting (TX) node propagate to the RX through the line-of-sight links and on the reflected paths. At the same time, the physical engine of the RL tool is based on the geometrical optics (GO) and the uniform theory of diffraction (UTD) techniques [83].…”