Performance Analysis of Passive UHF RFID Systems under Cascaded Fading Channels and Interference Effects

In this paper, the performance of monostatic and bistatic passive ultrahigh-frequency radio-frequency identification (UHF RFID) systems under the effects of cascaded fading channels and interference is studied. The performance metric used is tag detection probability defined as probability that the instantaneous received power is higher than the receiver’s sensitivity. A closed-form expression of the detection probability is derived using cascaded forward and backscatter fading channels and reader antennas orientation. Furthermore, the performance of passive RFID systems under reader-to-tag interference caused by both the desired RFID signal and multiple RFID interferers is analyzed, and the effect of constructive and destructive interferences is examined. In addition, the maximum reading range in ideal, multipath fading and interfering environments is presented. The obtained results are very useful for the design and optimization of passive RFID systems from RF point of view.This work was made possible by NPRP grant NPRP4-726-2-272 from the Qatar National Research Fund (a member of Qatar Foundation).This is the accepted manuscript. The final version is available from IEEE at http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=6942226