Separation of overlapping RFID signals by antenna arrays
- 1 March 2008
- conference paper
- Published by Institute of Electrical and Electronics Engineers (IEEE)
- No. 15206149,p. 2737-2740
Abstract
Radio frequency identification (RFID) is a technology to wirelessly transmit the identity of tagged objects. For long-range (UHF) systems with multiple tags, the tag replies may overlap. Current solutions are based on collision avoidance using MAC protocols (e.g. slotted ALOHA and binary tree algorithms). This can be a time-consuming process. In this paper, it is shown how an antenna array in combination with blind source separation techniques can be used to separate multiple overlapping tag signals. The source signals are modeled as Zero Constant Modulus (ZCM) signals, and the corresponding ZCM algorithms are tested on synthetic and measured data sets.Keywords
This publication has 4 references indexed in Scilit:
- Algebraic Algorithms to Separate Overlapping Secondary Surveillance Radar RepliesIEEE Transactions on Signal Processing, 2007
- Trends and Brief Comments on Anti-collision Techniques in Radio Frequency Identification System2006
- Separation of zero/constant modulus signals2002
- An analytical constant modulus algorithmIEEE Transactions on Signal Processing, 1996