tailieunhanh - Báo cáo hóa học: " A Highly Efficient Generalized Teager-Kaiser-Based Technique for LOS Estimation in WCDMA Mobile Positioning Ridha Hamila"

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: A Highly Efficient Generalized Teager-Kaiser-Based Technique for LOS Estimation in WCDMA Mobile Positioning Ridha Hamila | EURASIP Journal on Applied Signal Processing 2005 5 698-708 2005 Hindawi Publishing Corporation A Highly Efficient Generalized Teager-Kaiser-Based Technique for LOS Estimation in WCDMA Mobile Positioning Ridha Hamila Etisalat University College Emirates Telecommunications Corporation . Box980 Sharjah UAE Email hamila@ Abdelmonaem Lakhzouri Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Elena Simona Lohan Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Markku Renfors Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Email Received 14 July 2003 Revised 27 July 2004 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. Keywords and phrases multipath delay estimation WCDMA mobile positioning DSP for wireless communications. 1. INTRODUCTION Even though mobile phone positioning is a rather new concept various potential technologies enabling the development of mobile .