WO2008067344A3 - Automatic gain control method and apparatus for wireless communication systems - Google Patents

Automatic gain control method and apparatus for wireless communication systems Download PDF

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Publication number
WO2008067344A3
WO2008067344A3 PCT/US2007/085695 US2007085695W WO2008067344A3 WO 2008067344 A3 WO2008067344 A3 WO 2008067344A3 US 2007085695 W US2007085695 W US 2007085695W WO 2008067344 A3 WO2008067344 A3 WO 2008067344A3
Authority
WO
WIPO (PCT)
Prior art keywords
agc
symbol
gain control
automatic gain
wireless communication
Prior art date
Application number
PCT/US2007/085695
Other languages
French (fr)
Other versions
WO2008067344A2 (en
Inventor
Haitao Wang
Original Assignee
Adaptix Inc
Haitao Wang
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN2006101608467A external-priority patent/CN101192862B/en
Application filed by Adaptix Inc, Haitao Wang filed Critical Adaptix Inc
Publication of WO2008067344A2 publication Critical patent/WO2008067344A2/en
Publication of WO2008067344A3 publication Critical patent/WO2008067344A3/en

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3036—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers
    • H03G3/3042—Automatic control in amplifiers having semiconductor devices in high-frequency amplifiers or in frequency-changers in modulators, frequency-changers, transmitters or power amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2626—Arrangements specific to the transmitter only

Abstract

A system and method are provided for automatic gain control (AGC) using an adaptive reference and a threshold. An adaptive reference allows for adjusting the target power based on variations in operating parameters and conditions, such as a change to a modulation schemes which requires a different signal to noise ratio (SNR) to maintain performance. A gain adjustment threshold allows for rapid AGC response while reducing the potential effects of hysterisis. AGC levels may be changed during symbol prefixes or suffixes, and avoided during a data portion of a signal. Embodiments allow for symbol-by symbol AGC changes in OFDM, OFDMA, and TDD systems.
PCT/US2007/085695 2006-11-30 2007-11-28 Automatic gain control method and apparatus for wireless communication systems WO2008067344A2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN2006101608467A CN101192862B (en) 2006-11-30 2006-11-30 Method and device for automatic gain control in wireless communication system
CN200610160846.7 2006-11-30
US11/651,235 US8023598B2 (en) 2006-11-30 2007-01-09 Automatic gain control method and apparatus for wireless communication systems
US11/651,235 2007-01-09

Publications (2)

Publication Number Publication Date
WO2008067344A2 WO2008067344A2 (en) 2008-06-05
WO2008067344A3 true WO2008067344A3 (en) 2008-08-21

Family

ID=39468661

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US2007/085695 WO2008067344A2 (en) 2006-11-30 2007-11-28 Automatic gain control method and apparatus for wireless communication systems

Country Status (1)

Country Link
WO (1) WO2008067344A2 (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9124234B1 (en) 2014-04-11 2015-09-01 Entropic Communications, LLC. Method and apparatus for adaptive automatic gain control

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6668027B1 (en) * 1999-03-02 2003-12-23 Hitachi America, Ltd. Self adjusting automatic gain control (AGC) power reference level circuit
US7027530B2 (en) * 2001-04-11 2006-04-11 Atheros Communications, Inc. Method and apparatus for maximizing receiver performance utilizing mid-packet gain changes
US20060222118A1 (en) * 2005-03-11 2006-10-05 Quancomm Incorporated Automatic gain control for a wireless receiver

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6668027B1 (en) * 1999-03-02 2003-12-23 Hitachi America, Ltd. Self adjusting automatic gain control (AGC) power reference level circuit
US7027530B2 (en) * 2001-04-11 2006-04-11 Atheros Communications, Inc. Method and apparatus for maximizing receiver performance utilizing mid-packet gain changes
US20060222118A1 (en) * 2005-03-11 2006-10-05 Quancomm Incorporated Automatic gain control for a wireless receiver

Also Published As

Publication number Publication date
WO2008067344A2 (en) 2008-06-05

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