Patent ID: 8254503

Claim:
An automatic gain control tracking system comprising: a variable gain amplifier configured to amplify an input signal in accordance with a first gain, wherein the input signal comprises a plurality of orthogonal frequency domain multiplexing (OFDM) symbols, and wherein each of the plurality of orthogonal frequency domain multiplexing (OFDM) symbols in the input signal is preceded by a respective cyclic prefix; an automatic gain control module configured to vary the first gain of the variable gain amplifier during the respective cyclic prefix preceding each of the plurality of orthogonal frequency domain multiplexing (OFDM) symbols in the input signal; an analog-to-digital converter module configured to convert the amplified input signal from an analog format to a digital format; and a digital gain adjuster module configured to generate an output by amplifying, in accordance with a second gain, the amplified input signal in the digital format, wherein the automatic gain control module is configured to change the second gain of the digital gain adjuster module opposite to the first gain of the variable gain amplifier, and vary the first gain of the variable gain amplifier based on the output of the digital gain adjuster module.