Method and apparatus for cancelling self-interference signal between transmission antenna and reception antenna
An apparatus for cancelling a self-interference signal between a transmission antenna and a reception antenna is disclosed. The apparatus includes a first self-interference signal cancellation unit for cancelling a self-interference signal in consideration of a linear channel between the transmission antenna and the reception antenna, a second self-interference signal cancellation unit for cancelling a self-interference signal in consideration of nonlinear channel characteristic between the transmission antenna and the reception antenna or linear characteristic of a radio channel, and a controller for comparing a transmitted signal output from the transmission antenna and a received signal received by the reception antenna to provide a first coefficient to be applied to self-interference signal cancellation of a linear device in the first self-interference signal cancellation unit and a second coefficient to be applied to self-interference signal cancellation of a nonlinear device in the second self-interference signal cancellation unit.
1. An apparatus for cancelling a self-interference signal between a transmission antenna and a reception antenna, the apparatus comprising:
a first self-interference signal cancellation unit for cancelling a self-interference signal in consideration of a linear channel between the transmission antenna and the reception antenna;
a second self-interference signal cancellation unit for cancelling a self-interference signal in consideration of nonlinear channel characteristic or linear characteristic of a radio channel between the transmission antenna and the reception antenna; and
a controller for comparing a transmitted signal output from the transmission antenna and a received signal received by the reception antenna to provide a first coefficient to be applied to self-interference signal cancellation of a linear element in the first self-interference signal cancellation unit and a second coefficient to be applied to self-interference signal cancellation of a nonlinear element in the second self-interference signal cancellation unit.
2. The apparatus according to claim 1 , wherein the second self-interference signal cancellation unit cancels a self-interference signal of a nonlinear element using the second coefficient.
3. The apparatus according to claim 1 , wherein the first self-interference signal cancellation unit cancels a linear self-interference signal in consideration of time taken to receive the transmitted signal by the reception antenna using the first coefficient.
4. The apparatus according to claim 1 , wherein the first self-interference signal cancellation unit and the second self-interference signal cancellation unit are configured in series between a receiver comprising the transmission antenna and a receiver comprising the reception antenna.
5. The apparatus according to claim 1 , wherein the controller is configured between the transmission antenna and the reception antenna.
6. The apparatus according to claim 1 , wherein the first self-interference signal cancellation unit, and the second self-interference signal cancellation unit are connected and configured in series between a node between a band pass filter and a transmission antenna at a transmitter and a node between a band pass filter and a reception antenna at a receiver.
7. A method for cancelling a self-interference signal between a transmission antenna and a reception antenna, the method comprising:
comparing a transmitted signal output from the transmission antenna and a received signal received by the reception antenna to provide a first coefficient to be applied to self-interference signal cancellation of a linear element and a second coefficient to be applied to self-interference signal cancellation of a nonlinear element;
cancelling a linear self-interference signal using the first coefficient; and
cancelling a nonlinear self-interference signal using the second coefficient.
8. The method according to claim 7 , wherein the cancelling of the linear self-interference signal comprises cancelling a self-interference signal in consideration of time taken to receive the transmitted signal by the reception antenna using the first coefficient.