Method and system for reading RFID tags

Details Method and system for reading RFID tags Method and system for reading RFID tags

2007-05-23

2010-06-22

Vo, Don N (Department: 2611)

Pulse or digital communications

Receivers

Particular pulse demodulator or detector

Reexamination Certificate

active

07742547

ABSTRACT:
A method and a system for reading radio frequency identification (RFID) tags are provided. The method includes the following steps. First, receive a tag signal from the RFID tag. Recover a data clock rate from the tag signal according to statistics of pulse lengths of the tag signal. Next, determine a frame synchronization point of a data frame following a preamble in the tag signal by a signal correlation between the preamble and a predetermined signal pattern according to the data clock rate. Finally, decode the data frame by using an adaptive Viterbi algorithm on an extended trellis diagram. The extended trellis diagram includes a plurality of nodes and a plurality of branches connecting the nodes. The nodes and the branches are arranged according to the modulation scheme of the data frame and possible variations of the data clock rate.

REFERENCES:
patent: 5649295 (1997-07-01), Shober et al.
patent: 2003/0156603 (2003-08-01), Rakib et al.
patent: 2006/0098765 (2006-05-01), Thomas et al.
patent: 2009/0256750 (2009-10-01), Mathews et al.
patent: 2009/0259939 (2009-10-01), Lockett et al.
“A Robust Variable Step-Size LMS-Type Algorithm: Analysis and Simulations”, Tyseer Aboulnasr and K. Mayyas, IEEE, p. 631-639, vol. 45 No. 3 1997.

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