Open Access Research

On the performance of MIMO RFID backscattering channels

Chen He1*, Xun Chen1, Zhen Jane Wang1 and Weifeng Su2

Author Affiliations

1 Department of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada

2 Department of Electrical Engineering, State University of New York (SUNY) at Buffalo, Buffalo, NY, USA

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EURASIP Journal on Wireless Communications and Networking 2012, 2012:357  doi:10.1186/1687-1499-2012-357

Published: 29 November 2012

Abstract

In order to increase the reliability of data transmission, using multiple antennas in radio frequency identification (RFID) systems has been investigated by researchers, mainly through measurements and simulations. The multiple-input multiple-output (MIMO) RFID backscattering channel exhibits a special type of cascaded structure rather than that of other better-studied cascaded channels such as the keyhole fading and the double scattering fading. In this article, we analytically study the bit error rate performances of the MIMO RFID channel under two transmission schemes, the identical signaling transmission scheme and the orthogonal space–time coding scheme (OSTBC). We show that the diversity order of the MIMO RFID channel is min(N,L) under the identical transmission scheme, and the diversity order is L under the OSTBC scheme, where L is the number of tag antennas and N is the number of reader receiving antennas. A performance bottleneck is also observed in the MIMO RFID channel. Our results can provide useful guidance on designing an RFID system with multiple antennas.

Keywords:
MIMO systems; RFID; Backscattering channel; Cascaded structures; STBC; Diversity gain