Patent ID: 8149967

Claim:
An apparatus to process an input signal in a power line communication system, comprising: an analog automatic gain control (AGC) processor to control an analog adjustable gain of the input signal received via a power line using a feedback mechanism, wherein the input signal is modulated using Orthogonal Frequency Division Multiplexing, the analog AGC processor generating a first signal; a processing unit coupled to the analog AGC processor, the processing unit comprising an infinite impulse response (IIR) filter to remove from the first signal an out-of-band noise resulting from transmission of electricity and the input signal over the power line, wherein the IIR filter includes a digital band-pass biquad IIR filter of second-order that is initialized at a beginning of each frame; and a jammer canceller coupled to the IIR filter to cancel interference resulting from transmission of electricity and the input signal over the power line from an output of the IIR filter and to generate a second signal; and a digital AGC processor coupled to the processing unit to control a digital adjustable gain of the second signal using a feed-forward mechanism and to compensate for attenuation in the second signal resulting from the jammer canceller canceling the interference.