METHOD AND APPARATUS FOR DATA SIGNAL PROCESSING IN WIRELESS RFID SYSTEMS

摘要

The present invention provides methods and apparatuses for demodulation and decoding of backscattered RFID tag signals, represented by their in-phase and quadrature components at the output of the demodulator in the receiver portion of a reader interrogator. Autocorrelation coefficients for the in-phase and quadrature components of the received signal are calculated. The in-phase and quadrature coefficients are combined. The sign of output data is determined. Embodiments of the present invention are applicable to Gen 2 RFID systems as well as any wireless telecommunications system with the corresponding data modulation and/or encoding technique.