Performance of the Proposed Galileo CBOC Modulation in Heavy Multipath Environment |
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Authors: | Maurizio Fantino Paolo Mulassano Fabio Dovis Letizia Lo Presti |
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Affiliation: | (1) Istituto Superiore Mario Boella, Corso Castelfidardo 30/A, Turin, 10138, Italy;(2) Electronic Department, Politecnico di Torino, C. 50 Duca degli Abruzzi. 24, Turin, 10129, Italy |
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Abstract: | In the framework of the modernization plans of Global Navigation Satellite Systems (GNSS) a new Multiplexed Binary Offset
Carrier (MBOC) modulation has been proposed as a possible Signal-In-Space (SIS) with improved performance with respect to
the robustness against external sources of degradation. Discussion around such signal format are still on-going at the time
of writing, anyway it is the most probable candidate signal that will be adopted by both GPS L1C and the Galileo E1 Open Service
(OS) signals (, 2004)] as modernization of the present BOC(1,1). In the context of the integration between wireless communication and satellite
navigation, one of the major problems is that usually the GNSS receiver has to work in a critical environment characterized
by a heavy presence of multipath or interference sources. Some examples are urban canyons or light indoor spaces. These are
also typical situations for the usage of personal communications systems. The new MBOC modulation have been studied with the
specific goal to create a signal more robust with respect to multipath, bringing the high performance of Galileo in situations
in which the present BOC(1,1) shows limitations. In this sense, future Location Based Services (LBS) provided on the basis
of the GNSS OS will benefits from this intrinsic robustness of the signal. Throughout the paper a review of the MBOC structure
will be presented, specifying that in the Galileo framework such a structure has been proposed in a version named Composite
BOC (CBOC). In particular, the paper presents the simulation of the CBOC behavior in presence of multipath showing the extreme
improvement with respect to other BOC solutions.
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Keywords: | Galileo GPS MBOC CBOC Multipath |
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