DIGITAL AUTOMATIC GAIN CONTROL
First Claim
Patent Images
1. An automatic gain control (“
- AGC”
) system having an AGC gain and an AGC convergence speed, the AGC system comprising;
a summation module configured to determine an error signal based at least in part on a received signal and a reference signal;
a convergence module configured to generate a convergence speed gain for the AGC system based at least in part on the error signal, and output a scaled error signal,wherein the scaled error signal is based at least in part on the convergence speed gain and the error signal; and
a feedback module configured to receive an input signal and output the AGC gain, the input signal based at least in part on the AGC gain and the scaled error signal,wherein the AGC convergence speed is substantially independent of a signal level of the received signal.
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Abstract
An automatic gain control (“AGC”) system. The system includes a first multiplier, an envelope detector, a summation module, a filter module, a convergence module, and a feedback module. The convergence module includes a convergence control module and a second multiplier. The feedback module includes an accumulator, a scalar multiplier module, and a third multiplier. The system is configured to adjust or modify its convergence speed according to the state of convergence of the AGC system, and the convergence speed of the AGC system is substantially independent of a signal level of the received signal.
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Citations
20 Claims
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1. An automatic gain control (“
- AGC”
) system having an AGC gain and an AGC convergence speed, the AGC system comprising;a summation module configured to determine an error signal based at least in part on a received signal and a reference signal; a convergence module configured to generate a convergence speed gain for the AGC system based at least in part on the error signal, and output a scaled error signal, wherein the scaled error signal is based at least in part on the convergence speed gain and the error signal; and a feedback module configured to receive an input signal and output the AGC gain, the input signal based at least in part on the AGC gain and the scaled error signal, wherein the AGC convergence speed is substantially independent of a signal level of the received signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
- AGC”
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10. A method of automatic gain control (“
- AGC”
) in a digital receiver, the digital receiver including an AGC module having an AGC gain and an AGC convergence speed, the method comprising;determining an error signal based at least in part on a received signal and a reference signal; generating, in a convergence module, a convergence speed gain based at least in part on the error signal, and a scaled error signal based at least in part on the convergence speed gain and the error signal; and generating a feedback signal based at least in part on the AGC gain and the scaled error signal, the AGC gain based at least in part on the feedback signal, wherein the AGC convergence speed is substantially independent of a signal level of the received signal. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
- AGC”
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18. A device configured to process digital signals, the device comprising:
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a receiver including a demodulator, an equalizer, and an automatic-gain control (“
AGC”
) module;the AGC module having an AGC gain and an AGC convergence speed, and configured to determine an error signal based at least in part on a received signal and a reference signal; generate a convergence speed gain based at least in part on the error signal and a scaled error signal based at least in part on the convergence speed gain and the error signal; and generate a feedback signal based at least in part on the AGC gain and the scaled error signal, the AGC gain based at least in part on the feedback signal, wherein the AGC convergence speed is substantially independent of a signal level of the received signal. - View Dependent Claims (19, 20)
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Specification