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Digital radio receiver for an UHF-RFID system with an undersampling digitalization scheme

: Grey Oropeza, S.; Bögel, G. vom; Meyer, F.; Grabmaier, A.

Hollstein, T.:
RFID SysTech 2011. 7th European Workshop on Smart Objects: Systems, Technologies and Applications. CD-ROM : May, 17 - 18, 2011 in Dresden, Germany
Berlin: VDE-Verlag, 2011 (ITG-Fachbericht 229)
ISBN: 978-3-8007-3354-5
European Workshop on Smart Objects - Systems, Technologies and Applications (RFID SystTech) <7, 2011, Dresden>
Fraunhofer IMS ()
SDR (software defined radio); UHF RFID; undersampling; bandpass sampling; digital receiver

This paper describes a digital radio receiver for UHF-RFID systems based on an undersampling scheme for the signal digitalization. The original UHF signal is transferred into a digital intermediate frequency by means of undersampling. The sampled signal is transfered to an FPGA where it is decimated by a CIC filter, and demodulated using a digital I-Q demodulator. The baseband signal is obtained after the low-pass filtering. The details of the system are presented as well as some measurements.