Optical quality metal organic framework (MOF) thin films were integrated, for the first time, to the best of our knowledge, with structured optical fiber substrates to develop MOF-fiber sensors. The MOF-fiber structure, UiO-66 (Zr-based MOF is well known for its water stability), is a thin film that acts as an effective analyte collector. This provided a Fabry-Perot sensor in which concentrations of up to 15 mM Rhodamine-B were detected via wavelength shifts in the interference spectrum.
Chipless RFID systems are perhaps the most eligible candidate for catering to the demand of low-cost multiple item tagging in the future. However, one of the main challenges in chipless RFID systems, is its lower data capacity. Earlier we proposed a MIMO based chipless RFID system which has a higher data capacity using a threshold based detection technique. Maximum likelihood (ML) detection techniques have shown that the reading reliability can be significantly improved on a SISO chipless RFID system. In this paper, we present a detection technique that can be used to detect tag data bits in a MIMO based chipless RFID system. Preliminary results show the validity of the proposed detection method in terms of detection error rate under different noise conditions.
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