Patent ID: 8462836

Claim:
A method for determining an offset signal corresponding to a transmission leakage signal via a leakage signal offset unit located in a radio transceiver, the method comprising: setting, by the leakage signal offset unit, a leakage signal of a transmission signal on a vector phase-plane relative to a magnitude and a phase; dividing, by the leakage signal offset unit, the vector phase-plane into a plurality of areas in order to obtain a plurality of sample points for each of the plurality of areas; sequentially detecting, by the leakage signal offset unit, a vector between a first sample point and a second sample point among the plurality of sample points for each of the plurality of areas; calculating, by the leakage signal offset unit, a gradient of a resultant vector relative to the detected vector; determining, by the leakage signal offset unit, whether the resultant vector has converged into a current area by determining whether a central sample point is positioned below a planar surface of other sample points among the plurality of sample points; repeating, by the leakage signal offset unit, setting the leakage signal, dividing the vector phase-plane, sequentially detecting the vector, calculating the gradient, and determining whether the resultant vector has converged at least once when a descending gradient converging into the current area is detected; and determining, by the leakage signal offset unit, the offset signal corresponding to the transmission leakage signal by using a maximum descending gradient among the detected descending gradients.