RFID joint acquisition of time sync and timebase

Details RFID joint acquisition of time sync and timebase RFID joint acquisition of time sync and timebase

2008-09-02

2008-09-02

Walsh, Daniel (Department: 2887)

Registers

Coded record sensors

Particular sensor structure

C235S435000, C235S487000, C235S492000, C235S493000, C340S572100, C340S572200, C340S010100

Reexamination Certificate

active

11136948

ABSTRACT:
Systems and methods to determine timebase and timing (i.e., time sync) of received signals in RFID systems. Multiple matched filters corresponding to multiple timebases are used to receive the preambles of signals received from RFID tags. The multiple matched filters define a range of expected timebases of the received signals. The matched filter with the maximum output signal peak is used to derive the timebase and timing of the received signal. Viterbi techniques can be used in determining the timebase and timing to incorporate a portion of the data signal in addition to the preamble. Reconfigurable matched filters can be used so that after a preliminary timebase is determined as described above, the matched filters can be reconfigured to define a new smaller range centered about the preliminary timebase. This allows the timebase to be determined with finer resolution when another preamble portion is received.

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