Line-of-sight signal delay estimation is a crucial element for any mobile positioning system. Estimating correctly the delay of the first arriving path is a challenging topic in severe propagation environments, such as closely spaced multipaths in multiuser scenario. Previous studies showed that there are many linear and nonlinear techniques able to solve closely spaced multipaths when the system is not bandlimited. However, using root raised cosine (RRC) pulse shaping introduces additional errors in the delay estimation process compared to the case with rectangular pulse shaping due to the inherent bandwidth limitation. In this paper, we introduce a novel technique for asynchronous WCDMA multipath delay estimation based on deconvolution with a suitable pulse shape, followed by Teager-Kaiser operator. The deconvolution stage is employed to reduce the effect of the bandlimiting pulse shape.
This article is part of the series Improved CDMA Detection Techniques for Future Wireless Systems.
A Highly Efficient Generalized Teager-Kaiser-Based Technique for LOS Estimation in WCDMA Mobile Positioning
1 Etisalat University College, Emirates Telecommunications Corporation, P.O. Box 980, Sharjah, United Arab Emirates
2 Institute of Communications Engineering, Tampere University of Technology, P.O. Box 553, Tampere 33101, Finland
EURASIP Journal on Advances in Signal Processing 2005, 2005:685032 doi:10.1155/ASP.2005.698
The electronic version of this article is the complete one and can be found online at: http://asp.eurasipjournals.com/content/2005/5/685032
|Received:||14 July 2003|
|Revisions received:||27 July 2004|
|Published:||20 April 2005|
© 2005 Hamila et al.