Magneto-Inductive Localization: Fundamentals of Passive Relaying and Load Switching


Henry Schulten and Armin Wittneben


IEEE International Conference on Communications (ICC), Dublin, Ireland, June 2020.

DOI: 10.1109/ICC40277.2020.9149013

[BibTeX, LaTeX, and HTML Reference]


Magneto-inductive systems are extensively used for communication and wireless power transfer. However, they are equally advantageous for close range localization because they provide a high channel gain over short ranges and hardly suffer from non-line-of-sight conditions, synchronization problems, and interference. Their inherent near-field operation also introduces an exciting opportunity, which has hardly been explored to date in a localization context: The use of passive relays in the form of passive resonant coils with known locations. In this paper we systematically investigate the potential of passive relays for magneto-inductive localization with a circuit model which accounts for arbitrarily arranged system nodes. Based on the Crame ́r-Rao lower bound, we show that with carefully placed relay nodes, the position root-mean-square error (RMSE) can be improved by an order of magnitude. However, in order to also benefit from randomly placed relays, we slightly extend their functionality by including the possibility to switch off their loads (binary load switching). With this extension we can exploit the presence of multiple randomly placed relays to improve the RMSE by orders of magnitude and also drastically extend the supportable localization range.


Magnetic, Near Field, Localization, Relays

Download this document:


Copyright Notice: © 2020 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.