Patent ID: 7392031

Claim:
A method of canceling a narrow-band interference signal in a receiver, comprising the steps of: subtracting a reference signal from a received input signal; calculating the phase of a result of the subtraction on the basis of an arctangent function, performing an unwrap function on the output signal from the arctangent function, by removing the modulo 2Π limitation introduced with the arctangent function, thereby producing an absolute phase representation, determining a frequency offset by comparing phase representation values which are shifted predetermined in time, and canceling the narrow-band interference signal based on the result of the determined frequency offset, wherein the unwrap function accumulates k times 2Π, where k depends on the wrapped function so that k will be increased by 1 if the difference between the last corrected sample and the current sample is smaller than −Π, and k will be decreased by 1 if the difference between the last corrected sample and the current sample is greater than Π.