Efficient delay tracking methods with sidelobes cancellation for BOC-modulated signals
Burian, Adina (Tampereen teknillinen korkeakoulu. Institute of Communications Engineering)
Lohan, Elena-Simona (Tampereen teknillinen korkeakoulu. Institute of Communications Engineering)
Renfors, Markku Kalevi (Tampereen teknillinen korkeakoulu. Institute of Communications Engineering)

Fecha:	2007
Resumen:	In positioning applications, where the Line-of-Sight(LOS) is needed with high accuracy, the accurate delay estimation is an important task. The new satellite-based positioning systems such as Galileo and modernized GPS, will use a new modulation type, i. e the Binary Offset Carrier (BOC) modulation. This type of modulation creates multiple peaks (ambiguities) in the envelope of the correlation function, and, thus, triggers new challenges in the delay-frequency acquisition and tracking stages. Moreover, the properties of BOC-modulated signals are yet not well studied in the context of fading multipath channels. In this paper, Sidelobe Cancellation techniques are applied with various tracking structures in order to remove or diminish the sidepeaks, while keeping a sharp and narrow main lobe, thus allowing a better tracking. Five Sidelobe Cancellation Methods (SCM) are proposed and studied: SCM with Interference Cancellation (IC), SCM with narrow correlator, SCM with High Resolution Correlator (HRC), SCM with Differential Correlation (DC), and SCM with threshold. Compared to other delay tracking methods, the proposed SCM approaches have the advantage that they can be applied to any sine or cosine BOC-modulated signal. We analyze the performances of various tracking techniques in the presence of fading multipath channels and we compare them with other methods existing in the literature. The SCM approaches bring improvement also in scenarios with closely- spaced paths, which are the most problematic from the accurate positioning point of view.
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Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Publicado en:	Eurasip journal on wireless communications and networking, Volume 2007, Article ID 72626, 20 p., ISSN 1687-1472

20 p, 1.8 MB

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