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Method and system for DC compensation and AGC

A technology for compensating modules and timing relationships, which is applied in baseband systems, transmission systems, digital transmission systems, etc., and can solve problems such as DC level changes

Inactive Publication Date: 2011-02-23
QUALCOMM INC
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

For example, changing the gain of an LNA or mixer often causes the DC level to change accordingly

Method used

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  • Method and system for DC compensation and AGC
  • Method and system for DC compensation and AGC
  • Method and system for DC compensation and AGC

Examples

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Embodiment Construction

[0027] The techniques described here can be used in various wireless communication networks such as Code Division Multiple Access (CDMA) networks, Time Division Multiple Access (TDMA) networks, Frequency Division Multiple Access (FDMA) networks, Orthogonal FDMA (OFDMA) networks, single carrier FDMA (SC-FDMA) network, etc. The terms "network" and "system" are often used interchangeably. A CDMA network may implement a radio technology such as Universal Terrestrial Radio Access (UTRA), cdma2000, and so on. UTRA includes Wideband-CDMA (W-CDMA) and Low Chip Rate (LCR). cdma2000 covers IS-2000, IS-95 and IS-856 standards. A TDMA network may implement a radio technology such as Global System for Mobile Communications (GSM). OFDMA network can implement such as Evolved UTRA (E-UTRA), IEEE 802.11, IEEE 802.16, IEEE802.20, Flash-OFDM and other radio technologies. UTRA, E-UTRA and GSM are part of the Universal Mobile Telecommunications System (UMTS). Long Term Evolution (LTE) is an...

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Abstract

A technique for performing AGC and DC compensation in a receiver. The receiver comprises an energy estimator for generating an estimate of the level of a received signal; an RF device to apply gain to the received signal; an AGC for controlling the RF device gain based on the energy estimation; a first DC compensation loop for finely adjusting the DC component of the received signal in fast or slow tracking mode (FTM or STM); and a second DC compensation loop for coarsely adjusting the DC component of the received signal. Three modes of AGC operations: In Acquisition, iterations of FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during signal timing detection. In Connected, long energy estimation, RF device gain adjustment, and STM fine and coarse DC adjustments are performed during superframe preamble. In Sleep, FTM fine DC adjustment, short energy estimation, and RF device gain adjustment are performed during superframe preamble.

Description

[0001] Cross References to Related Applications [0002] This application claims the benefit of the filing date of Provisional Application No. 61 / 040,663, filed March 29, 2008, entitled "Method and System for DC Compensation and AGC," which is incorporated herein by reference. technical field [0003] The present disclosure generally relates to systems and methods for automatic gain control (AGC) and direct current (DC) voltage compensation in front-end radio frequency (RF) receiver systems. Background technique [0004] Wireless communication systems are widely used to provide various types of communication content, such as voice, data, and so on. These systems may be multiple-access systems capable of supporting communication with multiple users by sharing available system resources (eg, bandwidth and transmit power). Examples of such multiple-access systems include Code Division Multiple Access (CDMA) systems, Time Division Multiple Access (TDMA) systems, Frequency Divis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L25/06
CPCH04L25/061H03G3/3068H03G3/3078H04B1/06
Inventor T·A·卡道斯I·姚J·王W·景Y·李
Owner QUALCOMM INC
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