Signal Transmission with Intra-body and Inter-body Communications (Simulation-based Models)

Unpublished / Preprint


Publication Details

Author(s): Ahmed DMA, Kirchner J, Fischer G
Publication year: 2018
Language: English


Abstract

In this paper, we investigate two types of data transmission in human body communication (HBC) with galvanic coupling: Intra-body communication along a human arm and inter-body communication between
two arms in touch. For the former, the effect of bending the arm is investigated, too. The arms were modeled
as five-layers concentric cylinders of different types of tissue. For simulation, the finite element method (FEM) COMSOL Multiphysics5.3a software was used. The influence of different HBC key parameters including applied frequency, distance between transmitter (TX) and receiver (RX), bending, contact area between the contiguous models, and induced current were investigated. The results show that the transmission loss increases with the increase of the transmission length and operating frequency. The electrical potential is directly proportional to the induced current. Bending helps to improve the detected signal in the cases of short distance between TX and RX around the curvature. For distant transceivers, both straight and bended models tend to behave in a close manner. However, no joints are added to the model. The signal degradation in inter-body communication is considerably higher compared to intra-body communication at the same horizontal distance between TX and RX. At frequencies above 200 kHz, both inter-body and intra-body communication give close values when the contact area between the arms covers the distance between TX and RX electrodes. In addition, by increasing the contact area and avoiding gaps between the models, the detected signal is improved. The results illustrate the main determinants of information transmission between both sensors within a body-sensors-network and between different person.


FAU Authors / FAU Editors

Ahmed, Doaa Mahmoud Ahmed
Professur für Technische Elektronik
Fischer, Georg Prof. Dr.-Ing.
Professur für Technische Elektronik
Kirchner, Jens Dr.
Lehrstuhl für Technische Elektronik

Last updated on 2018-14-08 at 09:23