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The emergence of Human Body Communication (HBC) as an alternative to wirelessbody area networks (WBAN) has led to the development of small sized, energyefficient and more secure wearable and implantable devices forming a network inand around the body. Previous studies claim that though HBC is comparativelymore secure than WBAN, nevertheless, the electromagnetic (EM) radiative natureof HBC in >10MHz region makes the information susceptible to eavesdropping.Furthermore, interferences may be picked up by the body due to the human bodyantenna effect in the 40-400MHz range. Alternatively, electro-quasistatic (EQS)mode of HBC forms an attractive way for covert data transmission in the sub10MHz region by allowing the signal to be contained within the body. However,there is a gap in the knowledge about the mechanism and sources of interferencein this region (crucial in allowing for proper choice of data transmissionband). In this paper, the interference coupling modality in the EQS region isexplained along with its possible sources. Interferences seen by the wearablein the actual scenario is a non-trivial problem and a suitable measurement EQSHBC setup is designed to recreate it by employing a wearable sized measurementsetup having a small ground plane. For the first time, a human biophysicalinterference pickup model is proposed and interference measurement resultsusing a wearable device are presented up to 250kHz in different environmentalsettings.

In-The-Wild Interference Characterization and Modelling for Electro-Quasistatic-HBC with Miniaturized Wearables