BRPI0417743A - estimativa de canal para um sistema de comunicação ofdm com sub-bandas inativas - Google Patents

estimativa de canal para um sistema de comunicação ofdm com sub-bandas inativas

Info

Publication number
BRPI0417743A
BRPI0417743A BRPI0417743-6A BRPI0417743A BRPI0417743A BR PI0417743 A BRPI0417743 A BR PI0417743A BR PI0417743 A BRPI0417743 A BR PI0417743A BR PI0417743 A BRPI0417743 A BR PI0417743A
Authority
BR
Brazil
Prior art keywords
estimate
channel
response
communication system
subbands
Prior art date
Application number
BRPI0417743-6A
Other languages
English (en)
Inventor
Ashok Mantravadi
Aamod Khandekar
Edward Harrison Teague
Tamer Kadous
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 BRPI0417743A publication Critical patent/BRPI0417743A/pt

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0212—Channel estimation of impulse response
    • H04L25/0218—Channel estimation of impulse response with detection of nulls
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0228—Channel estimation using sounding signals with direct estimation from sounding signals
    • H04L25/023—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols
    • H04L25/0232—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols by interpolation between sounding signals
    • 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
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)

Abstract

"ESTIMATIVA DE CANAL PARA UM SISTEMA DE COMUNICAçãO OFDM COM SUB-BANDAS INATIVAS". Para a estimativa de canal em um sistema de comunicação sem fio de formato espectral, uma estimativa de resposta de freqüência inicial é obtida para um primeiro conjunto de P sub-bandas espaçadas de maneira uniforme (1) com base nos símbolos pilotos recebidos em um segundo conjunto de sub-bandas utilizado para transmissão piloto e (2) utilizando a extrapolação e/ou interpolação onde P é uma potência de dois. Uma estimativa de resposta ao impulso de canal é obtida pela realização de uma IFFT de ponto P na estimativa de resposta de freqüência inicial. Uma estimativa de resposta de freqüência final para N sub-bandas totais é derivada por (1) ajuste de derivações de baixa qualidade para a estimativa de resposta ao impulso de canal para zero, (2) enchimento com zero da estimativa de resposta ao impulso de canal até o comprimento N, e (3) realização de uma FFT de ponto N na estimativa de resposta ao impulso de canal com enchimento com zero. A estimativa de resposta ao impulso/freqüência de canal pode ser filtrada para obter uma estimativa de canal de qualidade mais alta.
BRPI0417743-6A 2003-12-19 2004-12-20 estimativa de canal para um sistema de comunicação ofdm com sub-bandas inativas BRPI0417743A (pt)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US10/741,524 US8391413B2 (en) 2003-12-19 2003-12-19 Channel estimation for an OFDM communication system with inactive subbands
PCT/US2004/043029 WO2005064870A2 (en) 2003-12-19 2004-12-20 Channel estimation for an ofdm communication system with inactive subbands

Publications (1)

Publication Number Publication Date
BRPI0417743A true BRPI0417743A (pt) 2007-04-10

Family

ID=34678176

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0417743-6A BRPI0417743A (pt) 2003-12-19 2004-12-20 estimativa de canal para um sistema de comunicação ofdm com sub-bandas inativas

Country Status (14)

Country Link
US (2) US8391413B2 (pt)
EP (1) EP1698129A2 (pt)
JP (2) JP2007515899A (pt)
KR (1) KR100860921B1 (pt)
CN (1) CN1918869B (pt)
AR (1) AR047158A1 (pt)
AU (1) AU2004308135C1 (pt)
BR (1) BRPI0417743A (pt)
CA (1) CA2549634A1 (pt)
IL (1) IL176305A0 (pt)
MX (1) MXPA06006973A (pt)
RU (1) RU2006125724A (pt)
TW (1) TW200537867A (pt)
WO (1) WO2005064870A2 (pt)

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Also Published As

Publication number Publication date
WO2005064870A2 (en) 2005-07-14
KR20060128914A (ko) 2006-12-14
US8903021B2 (en) 2014-12-02
US20050135509A1 (en) 2005-06-23
US8391413B2 (en) 2013-03-05
RU2006125724A (ru) 2008-01-27
IL176305A0 (en) 2006-10-05
HK1098607A1 (zh) 2007-07-20
AU2004308135C1 (en) 2009-07-02
AR047158A1 (es) 2006-01-11
KR100860921B1 (ko) 2008-09-29
US20130177059A1 (en) 2013-07-11
JP2007515899A (ja) 2007-06-14
CN1918869A (zh) 2007-02-21
WO2005064870A3 (en) 2005-11-03
MXPA06006973A (es) 2007-01-30
CN1918869B (zh) 2010-05-05
TW200537867A (en) 2005-11-16
AU2004308135A1 (en) 2005-07-14
JP2011024227A (ja) 2011-02-03
CA2549634A1 (en) 2005-07-14
AU2004308135B2 (en) 2008-12-11
EP1698129A2 (en) 2006-09-06

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