par Nguyen, Trung-Hien ;Golstein, Sidney ;Louveaux, Jérôme;De Doncker, Philippe ;Horlin, François
Référence (22-25 September, 2019: Honolulu, Hawaii, USA), Proc. of the IEEE 90th Vehicular Technology Conference, VTC-Fall
Publication Publié, 2019-09
Publication dans des actes
Résumé : Time reversal-based indoor positioning system(TRIPS) is a promising technology for the centimeteraccuracyindoor positioning, since it exploits the richmultipath propagation in indoor environments as a specificsignature for each location. In TRIPS, a database is firstconstructed via channel probing. Well-calibrated devicesare usually assumed in this process, i.e., no hardwareimpairments. However, a low cost terminal to be located,whose typical impairment is the I/Q imbalance (IQI) at thefront-end transmitter, can significantly influence the TRIPSperformance. More specifically, IQI creates an interferenceimage of the signal that reduces the metric value used inTRIPS and hence decreases the localization accuracy. Inthis paper, we analytically investigate the impact of the IQIon the metric of TRIPS. A closed-form approximation ofthe localization metric inherent to the IQI is derived. Inorder to improve the TRIPS performance, an effective IQImitigation method is proposed. Numerical simulations arecarried out to validate the derived analytical expressionunder the IQI impact and the proposed compensationmethod.