Patent ID: 8472576

Claim:
An apparatus to process an input signal received via a power line in a power line communication system, comprising: a jammer remover to remove interference resulting from transmission of electricity and the input signal over the power line from the input signal and to generate a jammer-canceled signal using an adaptive filtering procedure, wherein the jammer remover comprises: a band-pass filter having an adaptable parameter that controls a resonant frequency to band-pass the input signal to produce a band-passed signal; an adaptation circuit coupled to the band-pass filter to vary the resonant frequency adaptively using a stochastic gradient based procedure; and a subtractor coupled to the band-pass filter to generate an error signal using the input signal and the band-passed signal, the error signal representing the jammer-canceled signal; and a jammer detector coupled to the jammer remover to detect the interference, wherein the jammer detector comprises: an energy detector to generate a signal energy in the band-passed signal; a comparator coupled to the energy detector to compare the signal energy with a pre-determined threshold; and a jammer flag generator coupled to the comparator to generate an indicator that indicates if the interference is present in the input signal.