tailieunhanh - Báo cáo hóa học: "Application of Beamforming in Wireless Location Estimation"

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: Application of Beamforming in Wireless Location Estimation | Hindawi Publishing Corporation EURASIP Journal on Applied Signal Processing Volume 2006 Article ID 51673 Pages 1-13 DOI ASP 2006 51673 Application of Beamforming in Wireless Location Estimation Kamran Sayrafian-Pour1 and Dominik Kaspar2 1 National Institute of Standard and Technology Gaithersburg MD 20899 USA 2 Department of Computer Science Swiss Federal Institute of Technology Zurich Switzerland Received 1 June 2005 Revised 27 November 2005 Accepted 1 December 2005 A simple technique to estimate the position of a given mobile source inside a building is based on the received signal strength. For this methodology to have a reasonable accuracy radio visibility of the mobile by at least three access points is required. To reduce the number of the required access points and therefore simplify the underlying coverage design problem we propose a novel scheme that takes into account the distribution of RF energy around the receiver. In other words we assume that the receiver is equipped with a circular array antenna with beamforming capability. In this way the spatial spectrum of the received power can be measured by electronically rotating the main lobe around the 360-degree field of view. This spatial spectrum can be used by a single receiver as a means for estimating the position of the mobile transmitter. In this paper we investigate the feasibility of this methodology and show the improvement achieved in the positioning accuracy. Copyright 2006 K. Sayrafian-Pour and D. Kaspar. 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 recent years technologies that find the location of mobile sources inside buildings are becoming an attractive area of research and development. A significant application of such technologies is in emergency situations where it is important to be able to .