| 摘要 |
Disclosed in the present invention are an interference elimination device and method, used for eliminating interference in tag signals received by a reader in an RFID system. The device comprises: a control unit, a cancelling signal generating unit, a signal combining unit and a power detector. The cancelling signal generating unit is used for receiving a second carrier signal, a third carrier signal with a phase difference of 90 degrees with respect to the second carrier signal, and a fourth carrier signal with a phase difference of 180 degrees with respect to the second carrier signal, and for adjusting the amplitude of the second carrier signal, the third carrier signal and the fourth carrier signal according to an instruction from the control unit in order to generate multiple cancelling signals. The signal combining unit is used for receiving an interference signal and the multiple cancelling signals, adding or subtracting the interference signal and each of the multiple cancelling signals separately to obtain multiple combined signals, and eliminating the interference signal according to an instruction from the control unit. The power detector is used for detecting the amplitude of each combined signal. The control unit is used for determining an optimum cancelling signal according to the variation in amplitude of the combined signals, and controlling the signal combining unit to use the optimum cancelling signal to eliminate the interference signal. The adoption of the present invention enables elimination of interference to be achieved quickly and at a low cost. |
