BR0315773A - Estimativa de canal para sistemas de comunicação ofdm - Google Patents

Estimativa de canal para sistemas de comunicação ofdm

Info

Publication number
BR0315773A
BR0315773A BR0315773-3A BR0315773A BR0315773A BR 0315773 A BR0315773 A BR 0315773A BR 0315773 A BR0315773 A BR 0315773A BR 0315773 A BR0315773 A BR 0315773A
Authority
BR
Brazil
Prior art keywords
estimate
wireless channel
frequency response
subbands
communication systems
Prior art date
Application number
BR0315773-3A
Other languages
English (en)
Inventor
Ranganathan Krishnan
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 BR0315773A publication Critical patent/BR0315773A/pt

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B17/00—Monitoring; Testing
    • 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
    • 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
    • H04L25/022—Channel estimation of frequency response
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/42—TPC being performed in particular situations in systems with time, space, frequency or polarisation diversity

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Power Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

"ESTIMATIVA DE CANAL PARA SISTEMAS DE COMUNICAçãO OFDM". Trata-se de técnicas para estimar a resposta de frequência de um canal sem fio em um sistema OFDM. Em um método, uma estimativa inicial da resposta de frequência do canal sem fio é obtida para um primeiro grupo de sub-bandas com base na transmissão de piloto recebida por meio das sub-bandas do primeiro grupo. Uma estimativa da resposta de impulso do canal sem fio é em seguida obtida com base na estimativa de resposta de frequência inicial. Uma estimativa aperfeiçoada da resposta de frequencia do canal sem fio é então obtida para um segundo grupo de sub-bandas com base na estimativa de resposta de impulso. os primeiro e segundo grupos podem incluir, cada um, todas ou apenas um subconjunto das sub-bandas utilizáveis. A multiplexação de sub-bandas pode ser utilizada para permitir transmissões de piloto simultâneas de vários terminais em seus grupos afins de sub-bandas.
BR0315773-3A 2002-10-29 2003-10-29 Estimativa de canal para sistemas de comunicação ofdm BR0315773A (pt)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US42236202P 2002-10-29 2002-10-29
US42236802P 2002-10-29 2002-10-29
US10/340,130 US7039001B2 (en) 2002-10-29 2003-01-10 Channel estimation for OFDM communication systems
PCT/US2003/034506 WO2004040813A1 (en) 2002-10-29 2003-10-29 Channel estimation for ofdm communication systems

Publications (1)

Publication Number Publication Date
BR0315773A true BR0315773A (pt) 2005-09-13

Family

ID=32234144

Family Applications (1)

Application Number Title Priority Date Filing Date
BR0315773-3A BR0315773A (pt) 2002-10-29 2003-10-29 Estimativa de canal para sistemas de comunicação ofdm

Country Status (11)

Country Link
US (2) US7039001B2 (pt)
EP (1) EP1563622A4 (pt)
JP (2) JP2006505229A (pt)
KR (1) KR100982148B1 (pt)
CN (1) CN1708927B (pt)
BR (1) BR0315773A (pt)
CA (1) CA2501465A1 (pt)
IL (1) IL167571A0 (pt)
MX (1) MXPA05004520A (pt)
TW (1) TW200417166A (pt)
WO (1) WO2004040813A1 (pt)

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CA2501465A1 (en) 2004-05-13
US20040203442A1 (en) 2004-10-14
US20050170783A1 (en) 2005-08-04
CN1708927B (zh) 2013-07-10
TW200417166A (en) 2004-09-01
EP1563622A4 (en) 2011-08-17
US7463576B2 (en) 2008-12-09
AU2003287285A1 (en) 2004-05-25
MXPA05004520A (es) 2005-07-26
JP2006505229A (ja) 2006-02-09
KR100982148B1 (ko) 2010-09-14
CN1708927A (zh) 2005-12-14
US7039001B2 (en) 2006-05-02
JP2010213321A (ja) 2010-09-24
EP1563622A1 (en) 2005-08-17
IL167571A0 (en) 2009-02-11
KR20050070070A (ko) 2005-07-05

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