DocumentCode :
2847031
Title :
BPSK-like Methods for Hybrid-Search Acquisition of Galileo Signals
Author :
Burian, Adina ; Lohan, Elena Simona ; Renfors, Markku
Author_Institution :
Institute of Communications Engineering, Tampere University of Technology, P.O.Box 553, FIN-33101, Finland. adina.burian@tut.fi
Volume :
11
fYear :
2006
fDate :
38869
Firstpage :
5211
Lastpage :
5216
Abstract :
The Binary Offset Carrier (BOC) modulation which has been proposed for future Galileo and GPS M-code signals, provides a higher spectral separation from BPSK-modulated signals, such as GPS C/A code. The absolute value of the auto-correlation function of a BOC signal has a narrower main lobe, which may increase the resolution of delay estimates, but also presents deep fades, which may lead to a higher number of timing hypotheses to acquire the signal. In order to get rid of these ambiguities, several approaches have been proposed in literature, which provide an unambiguous BPSK-like shape of correlation function. In this paper we analyze, compare and develop further two BPSK-like methods which allow to acquire a BOC-signal unambiguously. The focus is on hybrid search, where several time-frequency bins are searched in parallel. We introduce here a modified version of a BPSK-like method which decreases the receiver complexity and is valid for both odd and even BOC orders. We analyze both single-side band (SSB) processing (i.e., only one band is used) and dual-side band (DSB) processing (i.e., upper and lower bands are combined non-coherently). While eliminating the ambiguities in auto-correlation function, both SSB and DSB processing present some performance degradation, induced by the band selection and non-coherent processing. The analysis is done in the presence of multipath fading channels. As a benchmark, we keep also the ambiguous BOC processing. We consider parameters specified in the proposals for Galileo system Open Service (OS), respectively Publicly Regulated Service (PRS).
Keywords :
Amplitude modulation; Autocorrelation; Degradation; Delay estimation; Global Positioning System; Modulation coding; Shape; Signal resolution; Time frequency analysis; Timing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Communications, 2006. ICC '06. IEEE International Conference on
Conference_Location :
Istanbul
ISSN :
8164-9547
Print_ISBN :
1-4244-0355-3
Electronic_ISBN :
8164-9547
Type :
conf
DOI :
10.1109/ICC.2006.255493
Filename :
4024877
Link To Document :
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