Automatic gain control and wireless communication device

A wireless communication apparatus comprising:

• an antenna configured to receive a radio signal;
• a variable gain amplifier configured to amplify the received signal using a variable gain;
• an analog-to-digital converter configured to convert the amplified signal into a digital signal;
• a gain setting unit configured to periodically update the gain of the variable gain amplifier in accordance with an output from an analog-to-digital converter;
• and
• an operating mode selection unit configured to select for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value or a one-slot average value of the output from said analog-to-digital converter, the selected operating mode being set in said gain setting unit,
• wherein one frame includes a plurality of slots.

A wireless communication apparatus comprising:

• an antenna configured to receive a radio signal;
• an isolator configured to isolate an I-component and a Q-component orthogonal to each other from the received signal;
• an I-component variable gain amplifier and a Q-component variable gain amplifier configured to amplify the isolated I-component and Q-component, respectively, using a variable gain;
• an I-component analog-to-digital converter and a Q-component analog-to-digital converter configured to convert the amplified I-component and Q-component, respectively, into respective digital signals;
• a gain setting unit configured to periodically update a gain common to said I-component variable gain amplifier and said Q-component variable gain amplifier, in accordance with outputs from said I-component analog-to-digital converter and said Q-component analog-to-digital converter;
• and
• an operating mode selection unit configured to select for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value or a one-slot average value of the outputs from said I-component analog-to-digital converter and said Q-component analog-to-digital converter, the selected operating mode being set in said gain setting unit,
• wherein one frame includes a plurality of slots.

A wireless communication apparatus comprising:

• an antenna configured to receive a radio signal;
• an isolator configured to isolate an I-component and a Q-component orthogonal to each other from the received signal;
• an I-component variable gain amplifier and a Q-component variable gain amplifier configured to amplify the isolated I-component and Q-component using a variable gain;
• an I-component analog-to-digital converter and a Q-component analog-to-digital converter configured to convert the amplified I-component and Q-component into respective digital signals;
• an I-component gain setting unit configured to periodically update a gain of said I-component variable gain amplifier in accordance with an output from said I-component analog-to-digital converter;
• an I-component operating mode selection unit configured to select for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value or a one-slot average value of the output from said I-component analog-to-digital converter, the selected operating mode being set in said I-component gain setting unit;
• a Q-component gain setting unit configured to periodically update a gain of said Q-component variable gain amplifier in accordance with an output from said Q-component analog-to-digital converter;
• and
• a Q-component operating mode selection unit configured to select for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value or a one-slot average value of the output from said Q-component analog-to-digital converter, the selected operating mode being set in said Q-component gain setting unit,
• wherein one frame includes a plurality of slots.

A wireless communication apparatus comprising:

• a first antenna and a second antenna configured to receive a radio signal:
• a first variable gain amplifier and a second variable gain amplifier configured to amplify the signal received via said first antenna and second antenna, respectively;
• a first analog-to-digital converter and a second analog-to-digital converter respectively configured to convert the amplified signals into respective digital signals;
• a gain setting unit configured to periodically update a gain common to said first variable gain amplifier and second variable gain amplifier in accordance with an output from said first analog-to-digital converter and an output from said second analog-to-digital converter;
• and
• an operating mode selection unit configured to select for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value or a one-slot average value of the outputs from said first analog-to-digital converter and said second analog-to-digital converter, the selected operating mode being set in said gain setting unit,
• wherein one frame includes a plurality of slots.

A method of controlling a gain of a variable gain amplifier provided at an input of an analog-to-digital converter, comprising:

• periodically updating the gain of the variable gain amplifier in accordance with an output from the analog-to-digital converter;
• and
• selecting for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value or a one-slot average value of the output from the analog-to-digital converter, the selected operating mode being set in said gain setting unit,
• wherein one frame includes a plurality of slots.

An automatic gain controller configured to control a gain of a variable gain amplifier provided at an input of an analog-to-digital converter, comprising:

• a gain setting unit configured to periodically update the gain of the variable gain amplifier in accordance with an output from the analog-to-digital converter;
• and
• means for selecting for each frame a single operating mode of a plurality of operating modes characterized by different gain updating periods based on either a one-frame average value and or a one-slot average value of the output from the analog-to-digital converter, the selected operating mode being set in said gain setting unit,
• wherein one frame includes a plurality of slots.