Relay apparatus and method of suppressing interference

A method performed by a wireless relay apparatus for relaying wireless communications between a first communication apparatus and a second communication apparatus, the wireless relay apparatus including:

• a transmission circuit configured to amplify power of a first signal and transmit of the first signal to the first communication apparatus;
• and a reception circuit configured to receive a mixed signal including a second signal from the second communication apparatus and the first signal transmitted by the transmission circuit, the method comprising:
• receiving the mixed signal from the reception circuit;
• and
• performing cancellation processing that includes first cancellation processing and second cancellation processing so as to cancel the first signal out of the mixed signal,
• wherein the first cancellation processing generates a first cancellation signal having a phase changed from a phase of the first signal after the amplification and before the transmission, and generates a composite signal produced by combining the first cancellation signal with the mixed signal, and
• the second cancellation processing extracts a difference between the composite signal and the first signal after the amplification and before the transmission, generates a second cancellation signal based on the extracted difference, and generates a cancelled signal produced by combining the second cancellation signal with the composite signal.