Self-interferecne cancellation method and its apparatus for on-frequency relay and repeater in ofdm-based wireless communication systems

PURPOSE: A method and an apparatus for removing self-interference of frequency relay and repeater in an OFDM-based wireless communication is provided to self-interference of relay which uses same frequency in a first link and second link. CONSTITUTION: An apparatus for removing self-interference of frequency relay and repeater comprises: a self-interference channel estimating unit(1040) which estimates wireless channel from transmission antenna of the relay to reception antenna; an estimated self-interference signal generator(1050) which generates estimation pseudo self-interference signal; a self-interference removing unit(1060) which removes the estimation pseudo self-interference signal from the received signal; and a standard signal generator(1010) which generates interference removal reference signal.