Magneto-Inductive Powering and Uplink of In-Body Microsensors: Feasibility and High-Density Effects


Gregor Dumphart, Bertold Ian Bitachon, and Armin Wittneben


IEEE Wireless Communications and Networking Conference (WCNC), Marrakech, Morocco, Apr. 2019.

DOI: 10.1109/WCNC.2019.8885956

[BibTeX, LaTeX, and HTML Reference]


This paper studies magnetic induction for wireless powering and the data uplink of microsensors, in particular for future medical in-body applications. We consider an external massive coil array as power source (1 W) and data sink. For sensor devices at 12 cm distance from the array, e.g. beneath the human skin, we compute a minimum coil size of 150 µm assuming 50 nW required chip activation power and operation at 750 MHz. A 275 µm coil at the sensor allows for 1 Mbit/s uplink rate. Moreover, we study resonant sensor nodes in dense swarms, a key aspect of envisioned biomedical applications. In particular, we investigate the occurring passive relaying effect and cooperative transmit beamforming in the uplink. We show that the frequency- and location-dependent signal fluctuations in such swarms allow for significant performance gains when utilized with adaptive matching, spectrally-aware signaling and node cooperation. The work is based on a general magneto-inductive MIMO system model, which is introduced first.


Conference slides are found HERE.

Download this document:


Copyright Notice: © 2019 IEEE. Personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution to servers or lists, or to reuse any copyrighted component of this work in other works must be obtained from the IEEE.

This material is presented to ensure timely dissemination of scholarly and technical work. Copyright and all rights therein are retained by authors or by other copyright holders. All persons copying this information are expected to adhere to the terms and constraints invoked by each author's copyright. In most cases, these works may not be reposted without the explicit permission of the copyright holder.