EURASIP Journal on Applied Signal Processing
Volume 2006 (2006), Article ID 25431, 16 pages
doi:10.1155/ASP/2006/25431

Adaptive Subchip Multipath Resolving for Wireless Location Systems

Nabil R. Yousef,1,2 Ali H. Sayed,1 and Nima Khajehnouri1

1Electrical Engineering Department, University of California, Los Angeles 90095-1594, CA, USA
2Newport Media Inc., Lake Forest 92630, CA, USA

Received 31 May 2005; Revised 3 November 2005; Accepted 8 December 2005

Copyright © 2006 Hindawi Publishing Corporation. 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.

Abstract

Reliable positioning of cellular users in a mobile environment requires accurate resolving of overlapping multipath components. However, this task is difficult due to fast channel fading conditions and data ill-conditioning, which limit the performance of least-squares-based techniques. This paper develops two overlapping multipath resolving methods (adaptive and nonadaptive), and shows how the adaptive solution can be made robust to the above limitations by extracting and exploiting a priori information about the fading channel. Also the proposed techniques are extended when there are antenna arrays at the base station. Simulation results illustrate the performance of the proposed techniques.