tailieunhanh - Báo cáo hóa học: " Research Article Modelling and Comparative Performance Analysis of a Time-Reversed UWB System"

Tuyển tập báo cáo các nghiên cứu khoa học quốc tế ngành hóa học dành cho các bạn yêu hóa học tham khảo đề tài: Research Article Modelling and Comparative Performance Analysis of a Time-Reversed UWB System | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 71610 11 pages doi 2007 71610 Research Article Modelling and Comparative Performance Analysis of a Time-Reversed UWB System K. Popovski B. J. Wysocki and T. A. Wysocki School of Electrical Computer and Telecommunications Engineering University of Wollongong Northfields Avenue Wollongong 2522 NSW Australia Received 30 April 2006 Revised 24 November 2006 Accepted 16 January 2007 Recommended by Merouane Debbah The effects of multipath propagation lead to a significant decrease in system performance in most of the proposed ultra-wideband communication systems. A time-reversed system utilises the multipath channel impulse response to decrease receiver complexity through a prefiltering at the transmitter. This paper discusses the modelling and comparative performance of a UWB system utilising time-reversed communications. System equations are presented together with a semianalytical formulation on the level of intersymbol interference and multiuser interference. The standardised IEEE channel model is applied and the estimated error performance is compared through simulation with the performance of both time-hopped time-reversed and RAKE-based UWB systems. Copyright 2007 K. Popovski et al. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use distribution and reproduction in any medium provided the original work is properly cited. 1. INTRODUCTION Following the release for commercial applications in early 2002 1 ultra-wideband UWB communications or impulse radio has seen significant attention. It is characterised by having a fractional bandwidth of more than 20 or bandwidth occupancy greater than 500 MHz 2 . Due to the increased bandwidth UWB is expected to support higher data rates than conventional narrowband systems. The two main competitors for the UWB standard are the UWB .