Semester Thesis

Simple Channel Model for UWB Body Area Networks

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. 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 previous work [1], preliminary UWB BAN channel measurements were performed and main channel parameters as ,e.g., path loss, delay spread, and mean excess delay extracted. However, no channel model, which can be used for evaluation of receiver structures, was derived. Therefore, in this semester project a simple channel model for UWB BAN shall be derived. Basis for the model will be existing BAN channel measurements. Nevertheless, additional channel measurements shall be performed to increase the set of channel measurements.

[1] 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
Students Kaspar Giger, Martin Vicentini
Supervisor Dr. Thomas Zasowski
Professor Prof. Dr. Armin Wittneben