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    • 6. 发明授权
    • Noise cancellation for RFID backscatter
    • RFID反向散射的噪声消除
    • US08340581B2
    • 2012-12-25
    • US12617534
    • 2009-11-12
    • John Stephen Smith
    • John Stephen Smith
    • H04B15/00
    • G06K7/0008
    • Methods and apparatuses for removing unwanted noise by a radio frequency identification (RFID) interrogator are provided. The interrogator transmits a transmitted signal while receiving a received signal. The received signal can include backscatter modulated signals from one or more RFID tags, as well as unmodulated reflections of the transmitted signal from the environment. The unmodulated reflections are undesirable and may make tag signal extraction difficult. A canceling signal is summed with the received signal to cancel or reduce the unmodulated reflections prior to tag signal extraction. In a specific embodiment, a phase shifted, amplitude adjusted reflection of the transmit signal is used by a directional coupler as the canceling signal.
    • 提供了通过射频识别(RFID)询问器去除不想要的噪声的方法和装置。 询问器在接收到接收到的信号的同时发送发送的信号。 所接收的信号可以包括来自一个或多个RFID标签的后向散射调制信号,以及来自环境的发射信号的未调制反射。 未调制的反射是不期望的,并且可能使标签信号提取困难。 消除信号与接收信号相加以消除或减少标签信号提取之前的未调制反射。 在具体实施例中,定向耦合器使用发射信号的相移幅度调整反射作为消除信号。