Multi-Channel Multi-Stage Transmultiplexing Digital Down Converter and Its Application to RFID (ISO18000-3 mode 2) Reader/Writer

Yuichi NAKAGAWA  Kei SAKAGUCHI  Hideki KAWAMURA  Kyoji OHASHI  Masahiro MURAGUCHI  Kiyomichi ARAKI  

Publication
IEICE TRANSACTIONS on Communications   Vol.E91-B   No.1   pp.139-146
Publication Date: 2008/01/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.1.139
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Cognitive Radio and Spectrum Sharing Technology)
Category: Enabling Technology
Keyword: 
multi-channel multi-stage transmultiplexing digital down converter,  software defined radio,  RFID,  ISO18000-3 mode 2,  implementation on FPGA,  

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Summary: 
Implementation of RFID reader/writer on software defined radio is studied in this paper. The target RFID is ISO18000-3 mode 2 which has 8 reply channels for simultaneous communication with 8 different RFID tags. In the software defined radio architecture, the 8 reply channels are sampled at a single A/D converter and separated by digital down converters, whereas conventional RFID architecture has redundant 8 parallel analog down converters. A novel multi-stage transmultiplexing digital down converter is proposed for efficient implementation of multi-channel digital down converter. Moreover the proposed architecture is implemented on a FPGA evaluation board, and validity of the system is confirmed on a real hardware. The proposed architecture can be applied to multi-channel receiver for dynamic spectrum system in the cognitive radio.