Proximity-detection-based Augmented RFID System Simulator (PASS)
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Proximity-detection-based Augmented RFID System Simulator (PASS) framework is a MATLAB-based time-domain system level simulator designed for UHF RFID. The simulation framework includes the model of UHF passive tag, reader, channel, as well as our recently developed semi-passive sensatag.
The tag model features the behavior of a NXP UCODE G2XM-based passive UHF RFID tag. The channel model combines large-scale fading antenna gain patterns and a stochastic small-scale model implementing an exponential average power-delay-profile. The model of tag and channel are inherited from the PARIS simulator developed by Dr. Arnitz. The model of reader does not reflect any specific type of reader, which works completely complying with ISO 18000-6C.  The sensatag model is designed to emulate the specific sensatag device, and the structure of the model is shown in the Figure 1.
The simulator is organized in a hierarchical fashion, shown in Figure 2. The user script “sensatag room.m” describes the simulation setup, which is scenario-dependent. The type of simulation, signal and control flow are defined in the behavior description script “sim sensatag room.m”. The basic main functions control the behavior of reader, channel, tag and sensatag through underlying model and calculation.
A word of warning: the PASS simulator is designed for our proximity-detection scenario, and testing the localization algorithm. The system has been developed under Windows and Matlab 2012a. The PASS simulator is an open source software: you can redistribute it and modify it under the term of the GNU General Public License.  The PASS is distributed in the hope that it will be useful, but without any warranty. 
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