Automatic gain control for a wireless receiver

A technology of gain value and equipment, which is applied in the field of communication, can solve problems such as increased cost and complex design of wireless receivers

Inactive Publication Date: 2008-04-30
QUALCOMM INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Analog VGA and detection circuitry can complicate and increase the cost of wireless receiver designs

Method used

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  • Automatic gain control for a wireless receiver
  • Automatic gain control for a wireless receiver
  • Automatic gain control for a wireless receiver

Examples

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Embodiment Construction

[0024] The word "exemplary" is used herein to mean "serving as an example, instance, or illustration." Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs.

[0025] The AGC techniques described herein may be used in a variety of wireless communication systems such as cellular systems, broadcast systems, wireless local area network (WLAN) systems, and the like. The cellular system can be a Code Division Multiple Access (CDMA) system, a Time Division Multiple Access (TDMA) system, a Frequency Division Multiple Access (FDMA) system, an Orthogonal Frequency Division Multiple Access (OFDMA) system, a Signal Carrier FDMA (SC-FDMA) ) system, etc. The broadcasting system may be a MediaFLO system, a digital video broadcasting (DVB-H) system, an integrated services digital broadcasting (ISDB-T) system for terrestrial television broadcasting, etc. The WLAN system may be an IEEE 802.11...

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PUM

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Abstract

Techniques for performing automatic gain control (AGC) at a wireless receiver are described. The total gain for the wireless receiver is achieved with discrete gain steps for analog circuitry and continuous gain for a digital variable gain amplifier (DVGA). An AGC loop is updated based on power measurements for an output signal from the DVGA. A first gain for the analog circuitry is selected from among multiple discrete gain values based on the AGC loop to maintain the average power of a baseband signal within a predetermined range at an analog-to-digital converter (ADC) input. A second gain for the DVGA is selected based on the AGC loop to maintain the average power of the output signal at a reference power level. The first gain is switched in a manner to avoid saturation of the ADC caused by the baseband signal and to provide switching hysteresis. The AGC may be performed in log domain and with multiple modes.

Description

[0001] This application claims priority to US Application Serial No. 60 / 660,882, filed March 11, 2005, entitled "AUTOMATIC GAINCONTROLLEER," which is assigned to its assignee and is incorporated herein by reference. technical field [0002] The present disclosure relates generally to communications, and more particularly to automatic gain control (AGC) for wireless receivers. Background technique [0003] In wireless communication systems, a transmitter typically processes (eg, encodes and modulates) data and generates a radio frequency (RF) modulated signal that is more suitable for transmission. The transmitter then transmits the RF modulated signal to the receiver via the wireless channel. The wireless channel distorts the transmitted signal by having a channel response and further degrades the signal quality by having noise and interference. [0004] The receiver receives the transmitted signal, conditions the received signal to obtain a baseband signal, and digitizes t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03G3/30
CPCH04L27/2614H04B1/18H03G7/007H04L27/2647H03G3/3089H03G3/3068H04L27/2601H03G3/3078H04L27/14H03G3/30
Inventor V·默西R·克里希纳穆蒂L·李
Owner QUALCOMM INC
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