Patent ID: 8509298

Claim:
An apparatus comprising: a finite impulse response (FIR) filter configured to filter a version of a digital signal to generate a compensation signal, wherein the FIR filter has filter coefficients, wherein the digital signal comprises a digital representation of a demodulated in-phase and quadrature phase component of a radio frequency (RF) signal; an adder configured to sum another version of the digital signal and a version of the compensation signal to generate a balanced digital signal that has an improved image rejection ratio versus the digital signal; and an adaptation step size adaptor configured to provide two or more different adaptation step sizes for updating the filter coefficients, wherein a selected one of the two or more different adaptation step sizes is configured to be multiplied with two or more samples of the balanced digital signal to generate an adjustment for a filter coefficient of the FIR filter, wherein one of the versions of the digital signal or the version of the compensation signal is a complex conjugate of the digital signal or a complex conjugate of the compensation signal, respectively, and the others are not the complex conjugates, wherein the FIR filter and the adder comprise electronic hardware.