Separation of multiple passive RFID signals using Software Defined Radio

Author

Shen, Dawei ; Woo, Grace ; Reed, David P. ; Lippman, Andrew B. ; Wang, Junyu

Author_Institution

Media Lab., Massachusetts Inst. of Technol., Cambridge, MA

fYear

2009

fDate

27-28 April 2009

Firstpage

139

Lastpage

146

Abstract

We present a practical design of an RFID reader that is capable of reading multiple passive tags through joint decoding. The reader is implemented and analyzed using the GNU Software Defined Radio system. We use low frequency (LF) 125 kHz commodity MIT ID cards in the experiment, and discuss extensions to decoding high frequency (HF) tags. This design reconsiders opportunities available in the lower layers of RFID design. Physical layer communication is analyzed rigorously and a complete system design is introduced as a result. We demonstrate this by exploring the differences in amplitudes and phase offsets among signal components, multiple tags can be separated and efficiently decoded using joint decoding. System performance is analyzed with both implementation and simulation. Based on these results, we summarize opportunities for improving industrial auto-collision algorithms with multiple-tag decoding capability.

Keywords

decoding; radiofrequency identification; software radio; frequency 125 kHz; high frequency tags decoding; industrial auto-collision algorithms; joint decoding; multiple passive RFID signals; physical layer communication; signal components; software defined radio; Decoding; Frequency; Guidelines; ISO standards; Independent component analysis; Passive RFID tags; Radiofrequency identification; Software radio; Source separation; Standards development;

fLanguage

English

Publisher

ieee

Conference_Titel

RFID, 2009 IEEE International Conference on

Conference_Location

Orlando, FL

Print_ISBN

978-1-4244-3337-7

Electronic_ISBN

978-1-4244-3338-4

Type

conf

DOI

10.1109/RFID.2009.4911203

Filename

4911203