Patent ID: 8112112

Claim:
A radio apparatus comprising: a receiver configured to receive as a reception signal a wirelessly transmitted signal; a transmitter provided in the vicinity of the receiver and configured to generate a transmission signal to be wirelessly transmitted with a frequency different from that of the reception signal; and a reception signal extracting unit provided in the receiver and configured to extract a reception signal component from an input signal containing the reception signal and the transmission signal, at a timing of a zero crossing of the transmission signal in the input signal, by using phase information including a phase of the transmission signal directly input from the transmitter to the receiver, such that the transmission signal contained in the input signal remains only as a DC offset value in the reception signal component, the DC offset value corresponding to a phase difference between the transmission signal in the input signal and the transmission signal directly input from the transmitter; wherein the reception signal extracting unit extracts a reception signal component having a frequency of |fR−fT|, where fR is a frequency of the reception signal and fT is a frequency of the transmission signal.