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Advanced Biophysical Model to Capture Channel Variability for EQS Capacitive HBC.
IEEE Transactions on Bio-Medical Engineering
|April 19, 2021
Summary
Human Body Communication (HBC) offers secure, broadband wireless channels. This study models path loss variability in capacitive HBC systems, crucial for reliable wearable device design.
Area of Science:
- Biophysics
- Electrical Engineering
- Biomedical Engineering
Background:
- Human Body Communication (HBC) is a promising alternative to radio frequency (RF) Wireless Body Area Networks (WBANs).
- HBC offers enhanced physical layer security and broadband capabilities due to lower radiation.
- Existing biophysical models for HBC do not account for device position variability.
Purpose of the Study:
- To analyze path loss variability in capacitive electro-quasistatic (EQS) HBC channels.
- To investigate the impact of inter-device coupling and fringe field effects on channel loss.
- To develop a validated biophysical model for EQS-HBC systems.
Main Methods:
- Finite Element Method (FEM) based simulations were used to analyze channel response.
- Simulations considered varying device positions and sizes on the human body.
- Measurement results were used to validate the developed biophysical model.
Main Results:
- Detailed analysis of path loss changes in capacitive HBC channels.
- Identification of inter-device coupling and fringe field effects as causes of variability.
- A validated biophysical model capturing channel response variability.
Conclusions:
- A closed-form equation for path loss in capacitive HBC channels was developed.
- Path loss is analyzed as a function of device geometry and position.
- The findings facilitate future EQS-HBC WBAN design for consumer and medical applications.
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