A-GNSS Sensitivity for Parallel Acquisition in Asynchronous Cellular Networks

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Increasing the dwell time in two-dimensional frequency-time hypothesis testing is, in practical terms, one of the most effective ways for Assisted Global Navigation Satellite Systems (A-GNSS) and GNSS receivers to achieve higher sensitivity. In an asynchronous cellular network, however, a mobile terminal may have a non-negligible unknown clock drift rate error originating from the received cellular downlink signal. In such a case, increasing the dwell time may not necessarily result in the expected sensitivity improvement. In addition, a mobile terminal in a rich multipath environment may experience jitters in the code phase of the resolved first arrival path due to short-delay multipaths, which also degrades the sensitivity. In this paper, new decision variables using a lone or a pair of adjacent.. 1 cells for code phase hypothesis testing and clock drift rate hypothesis testing are proposed to cope with the unknown code phase drift rate error and the effect of code phase jitter in a parallel acquisition system. The statistics of the proposed decision variables are analyzed in a Rayleigh fading channel, and the performances of the proposed decision variables are compared with that of the conventional decision variable.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2010-12
Language
English
Article Type
Article
Keywords

PERFORMANCE

Citation

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.9, no.12, pp.3770 - 3778

ISSN
1536-1276
DOI
10.1109/TWC.2010.092810.100070
URI
http://hdl.handle.net/10203/98894
Appears in Collection
GT-Journal Papers(저널논문)
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