Patent ID: 8509365

Claim:
An apparatus for narrowband interference cancellation, comprising: an adaptive filter receiving an input signal and releasing an output signal; a first delay unit coupled to the adaptive filter for generating a first delayed signal from the output signal of the adaptive filter, wherein the first delayed signal has a predetermined first delay length; an error calculation unit coupled to the adaptive filter and the first delay unit, wherein the error calculation unit compares the output signal from the adaptive filter and the first delayed signal from the first delay unit to extract first error information, and feedback the first error information to the adaptive filter, wherein the first error information is formed of an error function including coefficients, and wherein the first error information is used to adjust the adaptive filter and remove interference in the next input signal; and a second delay unit, the second delay unit generating a predetermined second delay length to the input signals and sending delayed input signals to the error calculation unit to obtain corresponding second error information for the adaptive filter to adjust the adaptive filter parameters.