Title :
The importance of fractional bandwidth in ultra-wideband pulse design
Author :
Welborn, Matthew ; McCorkle, John
Author_Institution :
XtremeSpectrum Inc., Vienna, VA, USA
Abstract :
Ultra-wideband (UWB) communications systems provide extremely high data rates while using low transmit power relative to narrowband systems. Previous research concludes that such systems have characteristics that make them appropriate for high-speed wireless network applications. One of the distinguishing aspects of the UWB signal is an extremely high fractional bandwidth when compared with conventional narrowband systems. This paper describes how a large fractional bandwidth leads to lower worst-case fading in the presence of multipath for UWB communications systems, thereby providing a significant advantage for a low-power wireless systems. Also included are measurements made using an actual UWB communications systems showing the magnitude of signal strength variations due to multipath interference.
Keywords :
broadband networks; electromagnetic wave absorption; fading channels; indoor radio; loss measurement; multipath channels; radio networks; radiofrequency interference; radiowave propagation; signal synthesis; UWB communications systems; UWB signal; coherence bandwidth; fractional bandwidth; high data rates; high-speed wireless network applications; indoor office environment; low transmit power; low-power wireless systems; multipath interference; propagation loss measurement; signal design; signal strength variations; ultra-wideband communications systems; ultra-wideband pulse design; worst-case fading; Bandwidth; Fading; Interference; Narrowband; Performance analysis; Pulse shaping methods; Signal design; Ultra wideband communication; Ultra wideband technology; Wireless networks;
Conference_Titel :
Communications, 2002. ICC 2002. IEEE International Conference on
Print_ISBN :
0-7803-7400-2
DOI :
10.1109/ICC.2002.996956
