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Several researches in the literature propose mechanisms for locating RFID tags using the RSSI indicator. However, the vast majority of these researches propose two-dimensional (2D) location solutions. In this work, we adopted a matrix composed of physical reference tags and virtual reference tags together with a mobile reader, to promote the localization of RFID tags in three-dimensional (3D) environment. In addition, our research differs from the others since we use mobile RFID reader, a feature that reduces deployment costs as a result of not having to use a set of fixed RFID readers. We developed the mechanism using the Matlab software and the performed experiments, demonstrated that our proposal obtained greater location accuracy, with gains of 46% when compared to the location error of other solutions.

Production lines normally present a verification step, which is responsible for warning about defective devices. That step, in digital television (DTV) production lines, often includes a tuning and decoding check, which basically verifies if DTV devices are capable of presenting audio and video. However, poor signal conditions may cause unnecessary rejections, which happen due to very hostile environments. Based on that, the present paper proposes a verification methodology that reports poor signal conditions during tuning tests, with the goal of indicating that the associated check must be executed again. Tests, in a real environment, showed that the proposed approach is effective and efficient, while revealed that less than 40% of the obtained rejections, in a target production line, were indeed caused by hardware problems.