BRPI0608230A2 - controle de freqüência automático para um sistema de comunicação sem fio com múltiplas subportadoras - Google Patents

controle de freqüência automático para um sistema de comunicação sem fio com múltiplas subportadoras

Info

Publication number
BRPI0608230A2
BRPI0608230A2 BRPI0608230-0A BRPI0608230A BRPI0608230A2 BR PI0608230 A2 BRPI0608230 A2 BR PI0608230A2 BR PI0608230 A BRPI0608230 A BR PI0608230A BR PI0608230 A2 BRPI0608230 A2 BR PI0608230A2
Authority
BR
Brazil
Prior art keywords
frequency
frequency error
received
error estimate
ofdm symbol
Prior art date
Application number
BRPI0608230-0A
Other languages
English (en)
Inventor
Alok Gupta
Seong-Taek Chung
Vinay Murthy
Fuyun Ling
Original Assignee
Qualcomm Inc
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
Application filed by Qualcomm Inc filed Critical Qualcomm Inc
Publication of BRPI0608230A2 publication Critical patent/BRPI0608230A2/pt

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING OR CALCULATING; COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/02—Digital function generators
    • G06F1/03—Digital function generators working, at least partly, by table look-up
    • G06F1/035—Reduction of table size
    • G06F1/0353—Reduction of table size by using symmetrical properties of the function, e.g. using most significant bits for quadrant control
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/2659—Coarse or integer frequency offset determination and synchronisation
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2662—Symbol synchronisation
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2675—Pilot or known symbols
    • 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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2673—Details of algorithms characterised by synchronisation parameters
    • H04L27/2676—Blind, i.e. without using known symbols
    • H04L27/2678—Blind, i.e. without using known symbols using cyclostationarities, e.g. cyclic prefix or postfix
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/0001—Arrangements for dividing the transmission path
    • H04L5/0003—Two-dimensional division
    • H04L5/0005—Time-frequency
    • H04L5/0007—Time-frequency the frequencies being orthogonal, e.g. OFDM(A) or DMT

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Theoretical Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • General Engineering & Computer Science (AREA)
  • Circuits Of Receivers In General (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
  • Time-Division Multiplex Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)
  • Radio Relay Systems (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

CONTROLE DE FREQüêNCIA AUTOMáTICO PABA UM SISTEMA DE COMUNICAçãO SEM FIO COM MúLTIPLAS SUBPORTADORAS. São descritas técnicas para executar controle de frequência em um sistema OFDM. Em um aspecto, a aquisição de frequência é executada com base em um piloto recebido, e rastreamento de frequência é executado com base em simbolos OFDM recebidos. Para aquisição de frequência, uma estimativa de erro de frequência inicial pode ser derivada com base no piloto recebido, e uma malha de controle automático de frequência (AFO) pode ser inicializado com a estimativa de erro de frequência inicial. Para rastreamento de frequência, uma estimativa de erro de frequência pode ser derivada para cada símbolo OFDM recebido, e a malha AFC pode ser atualizada com a estimativa de erro de frequência. Erro de frequência em amostras de entrada é corrigido pela malha AFC com a estimativa de erro de frequência inicial bem como a estimativa de erro de frequência para cada símbolo OFDM recebido. Em outro aspecto, um número variável de amostras de um símbolo OFDM recebido, por exemplo, com base na temporização de símbolo OFDM recebido, para uso para estimação de erro de frequência.
BRPI0608230-0A 2005-03-11 2006-03-13 controle de freqüência automático para um sistema de comunicação sem fio com múltiplas subportadoras BRPI0608230A2 (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US66091405P 2005-03-11 2005-03-11
PCT/US2006/009475 WO2006099532A2 (en) 2005-03-11 2006-03-13 Automatic frequency control for a wireless communication system with multiple subcarriers

Publications (1)

Publication Number Publication Date
BRPI0608230A2 true BRPI0608230A2 (pt) 2009-11-24

Family

ID=36992432

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0608230-0A BRPI0608230A2 (pt) 2005-03-11 2006-03-13 controle de freqüência automático para um sistema de comunicação sem fio com múltiplas subportadoras

Country Status (8)

Country Link
US (1) US8009775B2 (pt)
EP (1) EP1869767A2 (pt)
JP (1) JP2008544591A (pt)
CN (1) CN101313546B (pt)
BR (1) BRPI0608230A2 (pt)
CA (1) CA2600489A1 (pt)
SG (1) SG160381A1 (pt)
WO (1) WO2006099532A2 (pt)

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Also Published As

Publication number Publication date
WO2006099532A3 (en) 2008-07-24
US8009775B2 (en) 2011-08-30
WO2006099532A2 (en) 2006-09-21
CA2600489A1 (en) 2006-09-21
JP2008544591A (ja) 2008-12-04
SG160381A1 (en) 2010-04-29
EP1869767A2 (en) 2007-12-26
US20060215778A1 (en) 2006-09-28
CN101313546A (zh) 2008-11-26
CN101313546B (zh) 2013-01-16

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