Query Diversity Schemes for Backscatter RFID Communications With Single-Antenna Tags

Recently unitary query (UTQ) was introduced to exploit the query diversity for the multiple-input multiple output backscatter radio-frequency identification communications. Compared with the conventional uniform query (UFQ), UTQ can shift the multiantenna requirement for high performance from the tag end to the reader end. In this paper, the authors focus on the specific L x 1 x N backscatter channel where the tag has a single antenna and the reader has multiple antennas. This channel is of particular interest in practice. The authors first analytically studied the performance of UTQ by showing an equivalence between the L x 1 x N backscatter system employing UTQ and the M × L × N system employing UFQ, and by showing an optimal property of UTQ. Furthermore, the authors proposed another query diversity scheme, the query antenna selection (QAS), and derived its asymptotic symbol error rate in closed form. QAS achieves the same diversity order as that of UTQ and outperforms UTQ by a few decibels of selection gains, and QAS does not require to code the tag signals to achieve this performance. When compared with UTQ, QAS is not applicable when the tag has multiple antennas while instead it is a query diversity scheme particularly proposed for the backscatter channel with single-antenna tag, requiring less complexity for the tag.

Language

  • English

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 01648809
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Aug 17 2017 10:37AM