Abstract
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.
Highlights
Even though mobile phone positioning is a rather new concept, various potential technologies enabling the development of mobile location techniques have emerged and some of them are already in the market [1]
We introduce a novel technique for asynchronous wideband CDMA (WCDMA) multipath delay estimation based on deconvolution with a suitable pulse shape, followed by Teager-Kaiser operator
A new generalized TK technique for LOS signal delay estimation in downlink WCDMA transmission, using root raised cosine pulse shaping, over closely spaced multipath fading channels was introduced and its performance was compared with well-established methods
Summary
Even though mobile phone positioning is a rather new concept, various potential technologies enabling the development of mobile location techniques have emerged and some of them are already in the market [1]. At the mobile terminal side, a typical received WCDMA signal is composed of a sum of multiple propagation paths that may arrive at subchip delay intervals, generating closely spaced multipaths [8, 9, 10] This scenario of subchip overlapping multipath propagation causes a major degradation of the positioning accuracy [11, 12, 13]. This approach, the so-called MUSIC, suffers from high complexity of implementation in WCDMA systems Another technique applied to solve closely spaced multipath components is based on constrained inverse filtering methods. We propose a highly efficient generalized Teager-Kaiser (GTK) approach for multipath delay estimation in WCDMA network mobile positioning with RRC pulse shape.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
