| 摘要 |
PURPOSE: A dual feedback adaptive interference canceller is provided to cancel a feedback signal fed back to a receiving terminal and cancel various interferences inputted from the outside for preventing oscillation phenomenon generated because an RF(Radio Frequency) signal transmitted from a transmission antenna is fed back to a reception antenna. CONSTITUTION: A signal distributor(302) extracts a part of an RF signal inputted through a main path and uniformly distributes the extracted signal. The first comparison and analysis control signal generator(304) compares and analyzes receiving signals of the main path and an auxiliary path using an output signal of the signal distributor(302) and a reference signal received through the auxiliary path, and generates a control signal fro canceling an interference signal. The first interference canceller(306) adjusts an amplitude factor and a phase factor of an output signal of a main negative feedback loop using the reference signal received through the auxiliary path and an output signal of the first comparison and analysis control signal generator(304) and outputs a cancellation signal for removing the interference. A time delay adjuster(308) adjusts a time delay factor of the output signal of the main negative feedback loop outputted from the first interference canceller(306). A phase converter(310) adjusts the phase factor of the output signal of the main negative feedback loop outputted from the time delay adjuster(308). A phase inverse combiner(312) inverts an output signal outputted from the phase converter(310) at 180°, combines the inverted signal with an RF signal through the main path, and cancels the interference. The second comparison and analysis control signal generator(314) compares and analyzes the receiving signals of the main path and the auxiliary path using the output signal of the signal distributor(302) and the reference signal received through the auxiliary path, generates a control signal for canceling the interference signal, and has an auxiliary negative feedback loop. The second interference canceller(316) adjusts an amplitude factor and a phase factor of an output signal of the auxiliary negative feedback loop using an output signal of the second comparison and analysis control signal generator(314), cancels the interference signal, and outputs the adjusted signal to the phase inverse combiner(312).
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