Wideband Characterization of Backscatter Channels
Conference: European Wireless 2011 - Sustainable Wireless Technologies
04/27/2011 - 04/29/2011 at Vienna, Austria
Proceedings: European Wireless 2011
Pages: 7Language: englishTyp: PDF
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Authors:
Arnitz, Daniel; Witrisal, Klaus (Signal Processing and Speech Communication Laboratory, Graz University of Technology, Austria)
Muehlmann, Ulrich (NXP Semiconductors, Gratkorn, Austria)
Abstract:
The wireless channel of backscatter radio systems is a two-way pinhole channel, created by the concatenation of two standard wireless channels. Pinhole channels cause higher attenuation and deeper fades than common wireless channels. Passive ultra-high frequency radio-frequency identification (UHF RFID) is such a backscatter radio system, with the backscattering tag acting as pinhole. While the effects of this type of channel are well-known in terms of fading statistics, the impact of the pinhole channel on wideband parameters is unknown. We present a method to calculate wideband backscatter channel parameters from the parameters of the constituent channels to and from the pinhole, with a focus on characteristics that are vital for narrowband and wideband ranging. The approximations are verified by simulations and by measurements in a UHF RFID warehouse portal.