Statistical Characterization and Mitigation of NLOS Bias in UWB Localization Systems

Details Statistical Characterization and Mitigation of NLOS Bias in UWB Localization Systems Statistical Characterization and Mitigation of NLOS Bias in UWB Localization Systems

2012-03-13

arxiv.org/abs/1203.2890v1

Montorsi, F.; Pancaldi, F.; Vitetta, G.; "Statistical Characterization and Mitigation of NLOS Bias in UWB Localization Systems

Computer Science

Information Theory

Scientific paper

Propagation in non-line-of-sight (NLOS) conditions is one of the major impairments in ultrawideband (UWB) wireless localization systems based on time-of-arrival (TOA) measurements. In this paper the problem of the joint statistical characterization of the NLOS bias and of the most representative features of LOS/NLOS UWB waveforms is investigated. In addition, the performance of various maximum-likelihood (ML) estimators for joint localization and NLOS bias mitigation is assessed. Our numerical results evidence that the accuracy of all the considered estimators is appreciably influenced by the LOS/NLOS conditions of the propagation environment and that a statistical knowledge of multiple signal features can be exploited to mitigate the NLOS bias, reducing the overall localization error.

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