A test-bed implementation of an acquisition system for indoor positioning |
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Authors: | Fabio Dovis Riccardo Lesca Gianluca Boiero Giorgio Ghinamo |
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Institution: | (1) Electronics Department, Politecnico di Torino, Corso Duca degli Abruzzi, 24, 10129 Turin, Italy;(2) Telecom Italia Lab, via G. Reiss Romoli, 274, 10148 Turin, Italy |
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Abstract: | Indoor GNSS signals are typically received with poor signal-to-noise ratio, which impairs the acquisition stage of common
global positioning system (GPS) receivers. Extending the coherent integration time increases the acquisition sensitivity,
but the data-bit-rate limits the maximum achievable performance. Non-coherent processing also improves the detection performance,
but indoor signals require a large amount of accumulations resulting in significant squaring loss. Moreover, both strategies
have high computational complexity which fixes demanding requirements for stand alone mass-market terminals operating in real
time. A sensitivity–complexity trade-off is therefore mandatory. Assisted-GPS, which is included in 3GPP specifications, reduces the overall acquisition complexity and enhances sensitivity. In this paper
we describe a low-complexity-assisted data-wipe-off technique that enables the high-sensitivity acquisition of GPS signals.
The method is based on the acquisition of the strongest signal in order to obtain information that eases the acquisition of
the weaker ones. The analysis also addresses sources of sensitivity loss, such as Doppler effects and local oscillator inaccuracies.
A test campaign with real signals and integration times up to 2 s validates the method, demonstrating the effectiveness of
the proposed technique in indoor environments. |
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