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    • 9. 发明申请
    • Signal-processing systems and methods for RFID-tag signals
    • 用于RFID标签信号的信号处理系统和方法
    • US20080143486A1
    • 2008-06-19
    • US11638894
    • 2006-12-14
    • John D. DownieRichard E. WagnerJames S. SutherlandMatthew S. WhitingLeo Nederlof
    • John D. DownieRichard E. WagnerJames S. SutherlandMatthew S. WhitingLeo Nederlof
    • H04B7/00
    • G06K7/0008
    • Systems and methods for reading a RFID-tag signal in the presence of noise and other propagation and circuit impairments using a RFID-tag reader are disclosed. The method includes receiving with a RFID-tag reader multiple copies of an original RFID-tag signal from a RFID tag. The original RFID-tag signal comprises an original bit sequence representative of information stored in the RFID tag. At least some of the received RFID-tag signal copies differ from one another due to noise or other signal impairments. The received multiple copies are processed on a sample-by-sample basis in the RFID-tag reader using digital signal processing techniques to obtain an improved received digitized RFID tag signal that substantially removes the noise and other impairments. This improved signal is used to recover the original bit sequence and thus the information stored in the RFID tag.
    • 公开了使用RFID标签读取器在存在噪声和其他传播和电路损伤的情况下读取RFID标签信号的系统和方法。 该方法包括使用RFID标签读取器从RFID标签接收原始RFID标签信号的多个副本。 原始RFID标签信号包括表示存储在RFID标签中的信息的原始比特序列。 由于噪声或其他信号障碍,至少一些所接收的RFID标签信号拷贝彼此不同。 在RFID标签读取器中,使用数字信号处理技术逐个采样处理所接收的多个拷贝,以获得基本上消除噪声和其他损伤的改进的接收数字化RFID标签信号。 该改进的信号用于恢复原始比特序列,从而恢复存储在RFID标签中的信息。