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C. Angerer, R. Langwieser, G. Maier, M. Rupp:
"Maximal Ratio Combining Receivers for Dual Antenna RFID Readers";
Vortrag: IEEE MTT-S International Microwave Workshop on Wireless Sensing, Local Positioning and RFID, Cavtat, Croatia; 24.09.2009 - 25.09.2009; in: "2009 IEEE MTT-S International Microwave Workshop Series on Wireless Sensing, Local Positioning, and RFID", (2009), ISBN: 978-1-4244-5062-6; S. 21 - 24.

Radio frequency identification (RFID) systems at
ultra high frequencies operate in an environment exposed to
fading. While state-of-the-art RFID readers utilise multiple
receive antennas with antenna multiplexing in order to deal
with the multipath propagation environment, this contribution
proposes maximal ratio combining at RFID reader receivers. A
dual receive antenna RFID reader is presented in this paper.
The composition of the receive signal and the constellation
in the I/Q plane on each antenna is analysed and discussed
thoroughly. With that knowledge, we design a receiver estimating
the channel coefficients and realising maximal ratio combining
of the received signals, thus achieving the optimum combination
of receive signals in terms of SNR maximisation. Underlying
assumptions on the receive signals at the RFID reader for the
design of the receiver have been cross-verified with measurements.
Furthermore, the receiver has been implemented on an
FPGA and functionally verified.

RFID, Reader Receiver, MIMO, Multiple Antenna, Diversity, Maximal Ratio Combining, Beamforming

http://publik.tuwien.ac.at/files/PubDat_177527.pdf

Projektleitung Christoph Mecklenbräuker:
Christian Doppler Lab "Funktechnologien für nachhaltige Mobilität"