par Nguyen, Trung-Hien ;Louveaux, Jérôme;De Doncker, Philippe ;Horlin, François
Référence Proc. of the IEEE 14th International Conference on Wireless and Mobile Computing, Networking and Communications, WiMob18(October 2018: Limassol, Cyprus), IEEE
Publication A Paraître, 2018-10
Publication dans des actes
Résumé : Time reversal has been shown as a promisingtechnology for the indoor positioning. Instead of mitigatingthe multipath channel, the time reversal based indoorpositioning system (TRIPS) exploits the rich multipathpropagation in indoor environments as a specific signaturefor each location. In order to do this, a database shouldbe first constructed by channel probing. The devicesused in this process are assumed to have no hardwareimpairments or be well calibrated. However, the low costterminal to be located can exhibit impairments, such asI/Q imbalance at the front end transmitter known to createan interference image of the signal that can particularlyimpact the performance of time reversal. In this paper, weinvestigate the impact of the I/Q imbalance on the TRIPS.We analytically show that the I/Q imbalance modifies themetric used for the localization and hence reduces thespatial focusing gain of TRIPS. Numerical simulationsare carried out to evaluate this observation. The resultsfurther show that the I/Q imbalance creates errors in thepositioning estimation. More specifically, at the gain andphase imbalances of respectively 1.1 and 10°, the focusinggain reduction is about 0.5 dB while the estimation errorrate is increased by about 5% in the specified scenario.