Semester Thesis

Wintersemester 04/05

Investigation and modeling of narrowband interference on UWB

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 Bmax = 7.5GHz. But the minimum bandwidth used by any UWB system has to be Bmin = 500MHz. The maximum allowed average power spectral density is given by -41.25dBm/MHz. Due to the extremely low transmit power, UWB devices have to cope with a number of different interferers. Especially, devices in close vicinity to the UWB receiver can cause severe interference. Since several narrowband interferers transmit their data burst wise, UWB transmission in the time between adjacent interferer bursts seems to be promising.

In this work, burst structures of different interferers shall be investigated based on standards. Measurements in time domain shall be performed to verify the burst structures taken from standards. Outcome of these investigations and measurements shall be a mathematical description of the interferers burst structures. This model shall be implemented in Matlab and compared to the results from standards and measurements.

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

Subject area Ultra Wideband, Body Area Networks, Physical Layer, MAC Layer
Type of work 50% Theory, 50% Software
Student Ting Jia Shi
Advisor Dr. Thomas Zasowski
Professor Prof. Dr. Armin Wittneben