A maximum likelihood based tag detection technique for MIMO chipless RFID systems

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.