By Topic

LOS estimation in overlapped multipath WCDMA scenarios via adaptive threshold

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

3 Author(s)
E. -S. Lohan ; Inst. of Commun. Eng., Tampere Univ. of Technol., Finland ; A. Lakhzouri ; M. Renfors

Mobile positioning is a topic of high interest in current mobile communication systems. The position location is usually derived from the estimates of the distances between mobile and the base stations, which are obtained from the time-of-arrival of the line-of-sight (LOS) component. In time-varying multipath fading channels, the LOS component is not always present, and even when it is present, it might be obstructed by one or several components arriving within short delay (i.e., shorter than the width of the main lobe of the pulse shaping function). This situation of overlapped paths is one of the main sources of error in LOS estimation. We introduce here an adaptive threshold for estimating the LOS component in the presence of overlapped multipath components for wideband CDMA (WCDMA) positioning applications. Our threshold technique is used in conjunction with Teager-Kaiser (TK) based delay estimation. The TK estimator was previously introduced in the context of RAKE receiver and it was shown to be an efficient method for solving closely spaced multipaths.

Published in:

Signal Processing Advances in Wireless Communications, 2003. SPAWC 2003. 4th IEEE Workshop on

Date of Conference:

15-18 June 2003