US 8,787,859 B2Granted

Automatic gain control apparatus and method

AssigneeRicoh Company, Ltd.

InventorMasaru Nakamura

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Abstract

An automatic gain control apparatus for a wireless receiver, including multiple variable gain amplifiers, one variable gain amplifier provided for each one of multiple receive chains and a gain controller to control a gain of the variable gain amplifiers provided for the plurality of receive chains. The gain controller includes multiple output level measurement units to measure an output level of a corresponding receive chain; a common gain determination unit to determine a common gain for each of the variable gain amplifiers based on a statistical value obtained from the output levels; multiple adjusted gain determination units, each adjusted gain determination unit determining an adjusted gain independently for each variable gain amplifier within a range narrower than the range of the common; and a gain setting unit to set a gain to each of the variable gain amplifiers based on the common gain and the adjusted gain.

Claims12

Dependent claims

An automatic gain control apparatus for a wireless receiver, comprising:

a plurality of variable gain amplifiers, one variable gain amplifier provided for each one of a plurality of receive chains;
and
a gain controller to control a gain of the variable gain amplifiers provided for the plurality of receive chains, the gain controller comprising:
a plurality of output level measurement units, each output level measurement unit to measure an output level of a corresponding receive chain;
a common gain determination unit to determine a common gain for each of the variable gain amplifiers based on a statistical value obtained from the output levels measured by the plurality of output level measurement units;
a gain setting unit to set a gain to each of the variable gain amplifiers;
and
a plurality of adjusted gain determination units, each adjusted gain determination unit determining an adjusted gain independently for each variable gain amplifier within a range narrower than the range of the common gain based on an output level of a corresponding receive chain measured after the gain setting unit sets the common gain to each one of the variable gain amplifiers of the corresponding receive chains,
wherein the gain setting unit sets a gain to each of the variable gain amplifiers based on the common gain and the adjusted gain.

6 more elements

An automatic gain control method using an automatic gain control apparatus for a wireless receiver including a plurality of variable gain amplifiers, one variable gain amplifier provided for each of a plurality of receive chains, and a gain controller to control a gain of the variable gain amplifiers provided for each of the plurality of receive chains, the method comprising:

an output level measurement step of measuring an output level of each of the receive chains;
a common gain determination operation of determining a common gain for each of the variable gain amplifiers based on a statistical value obtained from the output level of each of the receive chains measured by the output level measurement operation;
a first gain setting operation of setting the common gain, determined at the common gain determination operation, to each of the variable gain amplifiers;
an adjusted gain determination operation determining an adjusted gain independently for each of the variable gain amplifiers with a range narrower than a range of the common gain based on an output level of the corresponding receive chain measured after setting the common gain to each one of the variable gain amplifiers of the corresponding receive chain;
and
a second gain setting operation of setting a gain based on the common gain and the adjusted gain to each of the variable gain amplifiers.

3 more elements

Dependencies are inferred from the claim text.