Interference Cancellation In Radio Frequency Identification (RFID) Systems

Abstract

Maximizing the efficiency of Radio Frequency Identification (RFID) systems is one of the main challenges in application domains, such as logistics and supply chain management, where the undesired effect of interference can significantly degrade the speed of the inventory process. In RFID systems, a problem arises when one or several noise signals that are external to the system are present within the frequency band of the system during a read operation. Such interference will often cause misidentification of items and fault reporting in the RFID system. Increasingly, such interference is being caused by other RFID readers and/or transponders located near the system-of-interest that operate within the same or similar frequency band. In this project, RFID systems and interference in RFID systems are studied. Interference is demonstrated using Gaussian noise and its cancellation also designed and demonstrated using Quadrature Amplitude Modulation, with the aim of improving performance in RFID readers.