Patent ID: 8358996

Claim:
A receiver for extracting a desired signal component from a received signal, which received signal contains the desired signal component and may contain an interfering signal component, wherein the receiver comprises a first mixer which generates an intermediate frequency signal containing a frequency-shifted version of the received signal and a frequency-shifted version of an image of the received signal, the receiver further comprising: a second mixer for shifting the desired signal component of the intermediate frequency signal such that it is centered on a baseband frequency, so as to generate a first composite signal containing the shifted desired signal component and a shifted version of any interfering signal component contained in the image of the received signal; a third mixer for shifting an image of the desired signal such that it is centered on the baseband frequency, so as to generate a second composite signal containing the shifted image of the desired signal component and a shifted version of any interfering signal component contained in the received signal; an estimator for estimating, from the first and second composite signals, a coefficient whose magnitude is indicative of the amount of the interfering signal component that is present with the desired signal component in a selected one of the composite signals; a multiplier for scaling the complex conjugate of the selected composite signal by the coefficient so estimated; and an adder for subtracting the scaled signal output by the multiplier from the other composite signal to obtain a scaled version of the desired signal component.