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Time Of Arrival (TOA) estimation in multi-path dense environment for UWB back-scattering Radio Frequency IDentification (RFID) system is challenging due to the presence of strong clutter. In addition, the back-scattering RFID system has peculiar signal transmission and modulation characteristics, which are considerably different from conventional communication and localization systems. The existing TOA estimators proposed for conventional UWB systems are inappropriate for the back-scattering RFID system since they lack the required clutter suppression capability and do not account for the peculiar characteristics of back-scattering system.
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