Self-interference suppression control for a relay node

A relay node configured to control suppression of self-interference, the relay node comprising:

• a transmitter (TX) and a receiver (RX), wherein the relay node is configured to transmit and receive simultaneously using one of a same frequency channel and proximate frequency channels;
• a frequency translator configured to receive a TX signal and to shift the TX signal corresponding to a difference in local oscillator frequency used for the RX and the TX to produce a frequency shifted TX signal when the relay node operates in a proximate frequency channel operation mode;
• an interference signal estimator having:
• a first input configured to receive the frequency shifted transmitter signal from the transmitter (TX);
• and
• a second input configured to receive an adaptation metric;
• and
• an output configured to output an estimated interference signal generated by the interference signal estimator based on the transmitter signal and the adaptation metric;
• a first estimation block configured to estimate a blocking part;
• and
• a second estimation block configured to independently estimate a co-channel interference part of the interference signal;
• and
• a subtractor coupled to the output of the interference signal estimator and configured to subtract the estimated interference signal from a received signal in the receiver (RX) so as to actively cancel a signal transmitted from the relay node that leaks back into the receiver (RX) of the relay node to suppress self-interference, the subtractor being configured to subtract both the estimated blocking part and the estimated co-channel interference part from the received signal;
• and
• a determination component configured to determine, based on a signal quality of a signal received by the relay node, at least one of whether an increase of an amount of self-interference suppression is warranted and whether self-interference is to be decreased.