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    • 45. 发明授权
    • RFID joint acquisition of time sync and timebase
    • RFID联合获取时间同步和时基
    • US07419096B2
    • 2008-09-02
    • US11136948
    • 2005-05-24
    • Aanand EsterbergWilliam T. ColleranScott Anthony Cooper
    • Aanand EsterbergWilliam T. ColleranScott Anthony Cooper
    • G06K7/08G06K19/00G06K19/06H04Q5/22G08B13/14
    • G06K7/0008
    • 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.
    • 确定RFID系统中接收信号的时基和定时(即,时间同步)的系统和方法。 对应于多个时基的多个匹配滤波器被用于接收从RFID标签接收的信号的前导码。 多个匹配滤波器定义了接收信号的预期时基的范围。 具有最大输出信号峰值的匹配滤波器用于导出接收信号的时基和定时。 除了前导码之外,维特比技术可用于确定并入数据信号的一部分的时基和定时。 可以使用可重配置匹配滤波器,使得在如上所述确定初步时基之后,可以重新配置匹配滤波器以定义以初步时基为中心的新的较小范围。 这允许当接收另一个前同步码部分时,以更精细的分辨率确定时基。