Ultrasound for Data Transfers from Deep Implants

an Experimental Comparison Between Binary-Frequency-Shift-Keying and On-Off-Keying with Backscatter Modulation

Conference paper (2023)

Authors

L.F.M. Holzapfel Fraunhofer Institute for Reliability and Microintegration IZM
Vasiliki Giagka Fraunhofer Institute for Reliability and Microintegration IZM, Bio-Electronics - EEMCS
Research Group
Bio-Electronics (EEMCS) (TU Delft)
Copyright: © 2023 L.F.M. Holzapfel, Vasiliki Giagka
DOI
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https://doi.org/10.1109/IUS51837.2023.10308264
Wireless Modulation Communication Ultrasound Movement Implant Backscatter
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Published Date

2023

Language

English

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Faculty

Electrical Engineering, Mathematics and Computer Science

Department

Microelectronics

Research Group

Bio-Electronics

Abstract

Implantable devices need to communicate information to the outside world. For deep-seated miniaturized implants ultrasound communication can be favourable. However, implants need to operate during movement, and the selected communication scheme should be assessed accordingly. In this work, we implemented a simple protocol to transfer data packets based on On-Off-Keying (OOK) and Frequency-Shift-Keying (FSK) by backscatter modulation in ultrasonic communication links for deep implants.We then used it to compare FSK vs OOK encoding regarding the bit error rate during continuous ultrasound power transfer, and while moving, in a water tank setup. Our experiment shows, that sub-millimeter movements can have severe effects on OOK communication, but not for FKS. Therefore, FSK can allow for backscatter communication from deep implants regardless of their position and involved movements. The protocol can also be adapted to other backscatter modulation schemes in the future.