A Novel Methodology to Evaluate Uplink Exposure by Personal Devices in Wireless Networks


Over the last 20 years, the wireless technology has known a giant development in terms of devices and services, accompanied consequently by considerable doubts about the level of exposure to the electromagnetic fields radiated by these systems. An intermediate step in the assessment of the $64000 exposure is to statistically model the input power delivered to these personal devices during an uplink transmission. In this spirit, we tend to propose a scientific methodology for the characterization of the variability of the delivered input power for given propagation conditions. This methodology 1st addresses the influence of the non-public devices relative positioning, with respect to the user's body on the antennas performance furthermore on the exposure level. Second, it add-resses the sensitivity of the input power to the characteristics of the propagation channel. The exposure levels are investigated from specific absorption rates computed using finite-difference time-domain simulations on a practical numerical model of kid bodies. The input power is directly connected to the antenna radiation pattern and to the local propagation scenario, through effects like body obstruction and multipath diversity. The statistical analysis shows that the delivered input power will be modeled by an inverse Gaussian or a log-normal distribution.

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