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US 8,149,967 B2Granted
Combined dual feed-forward and feedback analog and digital automatic gain control for broadband communication
AssigneeMaxim Integrated Products, Inc.
InventorsMaher Umari, Kaveh Razazian, Victor V. Loginov, Amir Hosein Kamalizad
Life of this patent
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Abstract
An embodiment is a method and apparatus to process an input signal. An analog automatic gain control (AGC) processor controls an analog adjustable gain of the input signal using a feedback mechanism. The analog AGC processor generates a first signal. A processing circuit transforms the first signal into a second signal. A digital AGC processor controls a digital adjustable gain of the second signal using a feed-forward mechanism.
Claims27
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.
4 more elements
A method for processing an input signal in a power line communication system comprising:
- controlling an analog adjustable gain of the input signal received via a power line using a feedback mechanism to generate a first signal using an analog automatic gain control (AGC) processor, wherein the input signal is modulated using Orthogonal Frequency Division Multiplexing;
- transforming the first signal into a second signal, wherein transforming the first signal comprises
- removing from the first signal an out-of-band noise resulting from transmission of electricity and the input signal over the power line using an infinite impulse response (IIR) filter, 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
- canceling interference resulting from transmission of electricity and the input signal over the power line from an output of the IIR filter using a jammer canceller coupled to the IIR filter and generating the second signal;
- and
- controlling a digital adjustable gain of the second signal using a feed-forward mechanism using a digital AGC processor;
- and
- compensating for attenuation in the second signal resulting from the jammer canceller canceling the interference.
6 more elements
A system to process an input signal in a power line communication system comprising:
- a front end processing module to process the input signal received via a power line, wherein the input signal is modulated using Orthogonal Frequency Division Multiplexing, the front end processing module comprising:
- an analog automatic gain control (AGC) processor to control an analog adjustable gain of the input signal using a feedback mechanism, 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, to compensate for attenuation in the second signal resulting from the jammer canceller canceling the interference, and to generate an output signal;
- a demodulator coupled to the front end processing module to demodulate a packet obtained from the output signal;
- and
- a decoder coupled to the demodulator to decode the demodulated packet.
8 more elements
Dependencies are inferred from the claim text.