Semester Thesis

Propagation of UWB Signals on the Human Body

Nodes in a BAN

In body area networks (BAN) several wireless nodes are placed directly or very close to the human body, e.g., in every day clothes. A number of different applications can be imagined, as e.g., medical monitoring or wireless multimedia transfer. Due to comfort reasons a node has to be very energy efficient and very small. Moreover, the nodes should be inexpensive, i.e., should have low complexity, due to the required number of nodes.

Ultra Wideband (UWB) communication is one transmission technology promising less complex hardware. There, transmission takes place in baseband, i.e., no hardware is required for mixers, RF oscillators or PLLs, as it would be necessary in narrowband systems. In [1], the Federal Communications Commission (FCC) allowed in the USA the frequency range between 3.1 and 10.6GHz for UWB communication purposes, i.e., the maximum allowed bandwidth is 7.5GHz. But the minimum bandwidth used by any UWB system has to be 500MHz. Using such a large bandwidth corresponds to transmission of very short pulses of some hundred pico-seconds.

In a project together with a global acting company we will use UWB for communication close to the human body.

As shown in a previous work [2] the human body itself has severe impact on the communication close to the body. Therefore, in this project channel measurements have to be performed for scenarios demanded by our industrial partner. On basis of these measurements you will have to extract the main channel parameters.

[1] FCC, "Revision of part 15 of the commisions's rules regardings ultra-wideband transmission systems," First Report and Order, ET Docket 98-153, FCC 02-48, adopted/released Feb. 14/ Apr. 22 2002.

[2] Thomas Zasowski, Frank Althaus, Mathias Stäger, Armin Wittneben, and Gerhard Tröster, "UWB for noninvasive wireless body area networks: Channel measurements and results", IEEE Conference on Ultra Wideband Systems and Technologies, UWBST 2003, November 2003, Reston, Virginia, USA

Subject area Ultra Wideband, Body Area Networks, Channel Measurements
Type of work 50% Measurements, 50% Theory
Student Florian Maurer
Advisor Dr. Thomas Zasowski
Professor Prof. Dr. Armin Wittneben