Patent ID: 8649417

Claim:
A method in a relay node for cancelling self-interference, wherein the relay node is connected to at least two reception antennas that are each configured to receive wireless signals, the method comprises: receiving an analogue input signal from each respective reception antenna, converting each received analogue input signal into a digital signal, digitally processing each digital signal in a signal processing unit, extracting a respective digital cancellation signal from each respective digitally processed digital signal, combining and filtering the extracted digital cancellation signals in respective multi-input-single-output filters comprised within the relay node, to produce a number of combined digital cancellation signals, wherein said number corresponds to a number of said at least two reception antennas, converting each combined digital cancellation signal into an analogue cancellation signal, and subtracting each analogue cancellation signal from the corresponding analogue input signal to obtain a respective corrected analogue input signal, which in turn is converted into a digital signal.