tailieunhanh - Báo cáo hóa học: " Multiuser Interference Mitigation in Noncoherent UWB Ranging via Nonlinear Filtering"

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: Multiuser Interference Mitigation in Noncoherent UWB Ranging via Nonlinear Filtering | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2006 Article ID 56849 Pages 1-10 DOI WCN 2006 56849 Multiuser Interference Mitigation in Noncoherent UWB Ranging via Nonlinear Filtering Zafer Sahinoglu1 and Ismail Guvenc2 1 Mitsubishi Electric Research Labs 201 Broadway Avenue Cambridge MA 02139 USA 2 Department of Electrical Engineering University of South Florida Tampa FL 33620 USA Received 1 September 2005 Revised 13 April 2006 Accepted 13 June 2006 Ranging with energy detectors enables low-cost implementation. However any interference can be quite detrimental to range accuracy. We develop a method that performs nonlinear filtering on the received signal energy to mitigate multiuser interference MUI and we test it over time hopping and direct sequence impulse radio ultra-wideband signals. Simulations conducted over IEEE residential line of sight ultrawideband multipath channels indicate that nonlinear filtering helps sustain range estimation accuracy in the presence of strong MUI. Copyright 2006 Z. Sahinoglu and I. Guvenc. 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 In time-of-arrival ToA -based ranging the range accuracy depends heavily on how well the ToA of a signal is estimated. Identifying multipath components and finding the leading path is crucial to decrease ranging errors. With its fractional bandwidth of 20 or at least 500 MHz bandwidth an ultra-wideband UWB signal provides high time resolution measured in nanoseconds and UWB helps to separate individual multipath components better than narrowband signals 1 . In UWB ranging tracking of the leading edge is challenging due to a vast number of multipaths and the fact that the line-of-sight LoS path may not have the highest amplitude. Traditionally UWB approaches