Experimental and statistical analysis of blind spots for UHF RFID portal applications

Abstract

The radiation field of a typical UHF RFID portal application was measured using our developed LabVIEW based automatic test platform. Path loss exponent and standard deviation of Log-normal shadowing model were obtained through MMSE criteria from measured data. Rician and Rayleigh empirical models were also introduced to predict the probability of blind spots. And fade margins were successfully compared for different blind spots probability.

Maximum Likelihood Approach for RFID Tag Cardinality Estimation under Capture Effect and Detection Errors

“…In particular, our considered system is modeled with flat Rayleigh fading channels, which have been shown, via measurements in [22]- [24], to be valid for indoor RFID systems with nonline-of-sight environments. The flat Rayleigh fading channel is also assumed in some other indoor RFID applications, which can be seen in [25]- [27]. Then, by assuming a certain SNR/SINR sensitivity threshold, the detection error and the capture effect probabilities are derived as a function of the threshold, which enables us to obtain the deterministic relation between the two probabilities.…”