BRPI0513412A - estimação de canal e interferência iterativa com tons piloto dedicados para ofdma - Google Patents

estimação de canal e interferência iterativa com tons piloto dedicados para ofdma

Info

Publication number
BRPI0513412A
BRPI0513412A BRPI0513412-9A BRPI0513412A BRPI0513412A BR PI0513412 A BRPI0513412 A BR PI0513412A BR PI0513412 A BRPI0513412 A BR PI0513412A BR PI0513412 A BRPI0513412 A BR PI0513412A
Authority
BR
Brazil
Prior art keywords
channel
estimate
interference level
value
dedicated pilot
Prior art date
Application number
BRPI0513412-9A
Other languages
English (en)
Inventor
Alexei Gorokhov
Avneesh Agrawal
Dhananjay Ashok Gore
Arvind Vijay Keerthi
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 BRPI0513412A publication Critical patent/BRPI0513412A/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
    • 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
    • H04L25/0236—Channel estimation using sounding signals with direct estimation from sounding signals with extension to other symbols using estimation of the other 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
    • 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
    • H04L25/024—Channel estimation channel estimation algorithms
    • H04L25/0242—Channel estimation channel estimation algorithms using matrix methods
    • H04L25/0248—Eigen-space methods
    • 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
    • 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), DMT
    • 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
    • H04L5/02—Channels characterised by the type of signal
    • H04L5/023—Multiplexing of multicarrier modulation signals

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)
  • Radio Relay Systems (AREA)
  • Noise Elimination (AREA)

Abstract

ESTIMAçãO DE CANAL E INTERFERêNCIA ITERATIVA COM TONS PILOTO DEDICADOS PARA OFDMA A estimação das características de canal e do nível de interferência em sistemas de vários usuários e de várias portadores variáveis no tempo é efetuada concomitantemente. Para se efetuar a estimação, vários símbolos de dados e símbolos piloto dedicados são transmitidos através do canal. Em seguida, um valor de estimativa inicial é selecionado para o nível de interferência. O valor de estimativa inicial para o nível de interferência é utilizado juntamente com os símbolos piloto recebidos de modo a se obter uma primeira estimativa do canal. A primeira estimativa do canal é utilizada para determinar um novo valor atualizado para o nível de interferência, que por sua vez é utilizado para atualizar iterativamente o valor da primeira estimativa do canal. As iterações continuam até que os valores, atualizados iterativamente, do nível de interferência e do canal satisfaçam limites pré-definidos. Os símbolos de dados e o valor atualizado final do canal são em seguida utilizados para se obter uma segunda estimativa do canal. é seguida uma abordagem MMSE na qual as estimativas de canal e a variância de ruído em um sistema OFDM são atualizadas iterativamente.
BRPI0513412-9A 2004-07-16 2005-07-18 estimação de canal e interferência iterativa com tons piloto dedicados para ofdma BRPI0513412A (pt)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US58864604P 2004-07-16 2004-07-16
US63915704P 2004-12-22 2004-12-22
PCT/US2005/025609 WO2006010159A1 (en) 2004-07-16 2005-07-18 Iterative channel and interference estimation with dedicated pilot tones for ofdma

Publications (1)

Publication Number Publication Date
BRPI0513412A true BRPI0513412A (pt) 2008-05-06

Family

ID=35197766

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0513412-9A BRPI0513412A (pt) 2004-07-16 2005-07-18 estimação de canal e interferência iterativa com tons piloto dedicados para ofdma

Country Status (15)

Country Link
US (1) US7830976B2 (pt)
EP (1) EP1774737B1 (pt)
JP (2) JP4819807B2 (pt)
KR (1) KR100884197B1 (pt)
CN (1) CN101019390B (pt)
AT (1) ATE472882T1 (pt)
AU (1) AU2005265419A1 (pt)
BR (1) BRPI0513412A (pt)
CA (1) CA2574080A1 (pt)
DE (1) DE602005022077D1 (pt)
IL (1) IL180744A0 (pt)
MX (1) MX2007000590A (pt)
RU (1) RU2343641C2 (pt)
TW (1) TW200627879A (pt)
WO (1) WO2006010159A1 (pt)

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Also Published As

Publication number Publication date
US20060109922A1 (en) 2006-05-25
KR100884197B1 (ko) 2009-02-18
WO2006010159A1 (en) 2006-01-26
ATE472882T1 (de) 2010-07-15
JP2011254494A (ja) 2011-12-15
JP2008507218A (ja) 2008-03-06
US7830976B2 (en) 2010-11-09
IL180744A0 (en) 2007-06-03
CA2574080A1 (en) 2006-01-26
MX2007000590A (es) 2007-04-02
EP1774737B1 (en) 2010-06-30
AU2005265419A1 (en) 2006-01-26
CN101019390B (zh) 2013-01-02
RU2007105744A (ru) 2008-08-27
DE602005022077D1 (de) 2010-08-12
KR20070038552A (ko) 2007-04-10
EP1774737A1 (en) 2007-04-18
JP5265735B2 (ja) 2013-08-14
TW200627879A (en) 2006-08-01
JP4819807B2 (ja) 2011-11-24
CN101019390A (zh) 2007-08-15
RU2343641C2 (ru) 2009-01-10

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Legal Events

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B08F Application dismissed because of non-payment of annual fees [chapter 8.6 patent gazette]

Free format text: REFERENTE A 6A ANUIDADE(S)

B08K Patent lapsed as no evidence of payment of the annual fee has been furnished to inpi [chapter 8.11 patent gazette]

Free format text: REFERENTE AO DESPACHO 8.6 PUBLICADO NA RPI 2144 DE 07/02/2012.