tailieunhanh - Báo cáo hóa học: " Research Article Analysis of Filter-Bank-Based Methods for Fast Serial Acquisition of BOC-Modulated Signals"

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: Research Article Analysis of Filter-Bank-Based Methods for Fast Serial Acquisition of BOC-Modulated Signals | Hindawi Publishing Corporation EURASIP Journal on Wireless Communications and Networking Volume 2007 Article ID 25178 11 pages doi 2007 25178 Research Article Analysis of Filter-Bank-Based Methods for Fast Serial Acquisition of BOC-Modulated Signals Elena Simona Lohan Institute of Communications Engineering Tampere University of Technology . Box 553 33101 Tampere Finland Received 29 September 2006 Accepted 27 July 2007 Recommended by Anton Donner Binary-offset-carrier BOC signals selected for Galileo and modernized GPS systems pose significant challenges for the code acquisition due to the ambiguities deep fades which are present in the envelope of the correlation function CF . This is different from the BPSK-modulated CDMA signals where the main correlation lobe spans over 2-chip interval without any ambiguities or deep fades. To deal with the ambiguities due to BOC modulation one solution is to use lower steps of scanning the code phases . lower than the traditional step of chips used for BPSK-modulated CDMA signals . Lowering the time-bin steps entails an increase in the number of timing hypotheses and thus in the acquisition times. An alternative solution is to transform the ambiguous CF into an unambiguous CF via adequate filtering of the signal. A generalized class of frequency-based unambiguous acquisition methods is proposed here namely the filter-bank-based FBB approaches. The detailed theoretical analysis of FBB methods is given for serial-search single-dwell acquisition in single path static channels and a comparison is made with other ambiguous and unambiguous BOC acquisition methods existing in the literature. Copyright 2007 Elena Simona Lohan. 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. 1. INTRODUCTION The modulation selected for modernized GPS and Galileo signals is .

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