Multiple antenna techniques for pulse-based ultra-wideband system

by Vemulapalli, Sudheer

Abstract (Summary)
fIndoor wireless local area networks (LAN's) and personal area networks (PAN’s) have evolved very rapidly in the recent past. The indoor wireless LAN's are mainly dominated by narrow-band technologies like the IEEE 802.11a,b which are short range and provide data rates of 1 Mbps to 54 Mbps. The Bluetooth has become the standard for low-data rate WPAN’s. Ultra-wideband (UWB), though an old technology, has generated a lot of interest lately to be a contender for the high data rate indoor applications. A UWB system could span multi-GHz bandwidth, which enables it to pro- vide a very high capacity. The IEEE is developing the standards for the high data rate indoor environments and the approach is tending towards multi-band UWB. This thesis studies the system architecture and error performance of pulse-based UWB systems with multiple transmitter and receiver antennas for indoor environments. Performance of space-time coded multiple antenna pulse-based UWB and space-time-frequency coded multiple-antenna pulse-based multi-band UWB are analyzed. For the multi-band sys- tem, the 7.5 GHz UWB spectrum specified by the FCC is divided into sub-bands of 528 MHz each, and multiple sub-bands can be simultaneously used for data transmission. We design codes that maximize coding and diversity gains for multiple-antenna systems over the frequency- selective UWB channels and provide detailed detection and decoding procedures. The proposed multi-antenna multi-band UWB system could dramatically increase link throughput as compared to existing schemes over non-line-of-sight (NLOS) dense multipath channels.
Bibliographical Information:

Advisor:Liu, Huaping; Magana, Mario; Eggerton, Jimmy; Coakley Jr, James A.

School:Oregon State University

School Location:USA - Oregon

Source Type:Master's Thesis

Keywords:antennas electronics design and construction signal processing wireless communication systems equipment supplies ultra wideband devices


Date of Publication:03/18/2004

© 2009 All Rights Reserved.