This paper examines differences between wireless ultra wideband radio channels when various test persons are measured. The work bases on static on-body measurements conducted in an anechoic chamber at the frequency range of 2-8 GHz by using a vector network analyzer. Three male and one female test persons were measured. The study was repeated by using two different planar antenna types: dipole ...

The spatial domain information of the propagation is extremely important to take into account the antenna systems in the wireless broadband systems. This paper describes the concept and the modeling of the double-directional spatio-temporal channel for wideband and ultra-wideband wireless systems. The research activities toward the establishment of the channel model in Tokyo Tech are also descr...

This paper mainly describes modelling of IEEE 802.15.3a standard UWB propagation channel in MATLAB. A performance analysis and comparison of the UWB propagation channel in four different environments are given, based on simulations in both MATLAB and ADS.

Research in the design of ultra-wideband (UWB) radio systems suggests di erent kinds of signal design criteria. After an introduction to UWB radio, a variety of sequence design problems, motivated by UWB system constraints, will be presented. Design for time-hopping, for spectral atness, for rapid acquisition, and for multiple access will be discussed, and some sample designs will be presented.

This study considers the different UWB antenna designs with band notch characteristics. Different antennas designs to reject interference from WLAN, WiMAX, DSRC, and HIPERLAN/2A are considered and listed in table. Index Terms – UWB, WLAN, WiMAX, HIPERLAN/2A.

Ultra-wideband (UWB) technology has become one of the most promising technology for shortrange high speed data communication due to its high data transmission rate and large bandwidth. These systems utilize the frequency band from 3.1GHz to 10.6 GHz, which is al‐ located to the UWB systems by the Federal Communications Commission (FCC) [1]. In this ultra-wide spectrum, several unlicensed short ...

............................................................................................................................... v Acknowledgments .............................................................................................................vii List of Publications.............................................................................................................xi Papers...

In this paper, we consider the possibility of developing an optimal medium access control (MAC) layer for high data rate ultra-wideband (UWB) transmission systems that transmit minimal power. MAC in UWB wireless networks is required to coordinate channel access among competing devices. The unique UWB characteristics offer great challenges and opportunities in effective UWB MAC design. We first ...