BRPI0418430A - estimativa de canal e transmissão piloto para um sistema ofdm com espalhamento de retardo excessivo - Google Patents

estimativa de canal e transmissão piloto para um sistema ofdm com espalhamento de retardo excessivo

Info

Publication number
BRPI0418430A
BRPI0418430A BRPI0418430-0A BRPI0418430A BRPI0418430A BR PI0418430 A BRPI0418430 A BR PI0418430A BR PI0418430 A BRPI0418430 A BR PI0418430A BR PI0418430 A BRPI0418430 A BR PI0418430A
Authority
BR
Brazil
Prior art keywords
pilot
ofdm system
channel estimation
pilot subbands
delay spreading
Prior art date
Application number
BRPI0418430-0A
Other languages
English (en)
Inventor
Dhananjay Ashok Gore
Avneesh Agrawal
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 BRPI0418430A publication Critical patent/BRPI0418430A/pt
Publication of BRPI0418430B1 publication Critical patent/BRPI0418430B1/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
    • H04L25/0224—Channel estimation using sounding signals
    • H04L25/0226—Channel estimation using sounding signals sounding signals per se
    • 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
    • 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
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
    • H04L27/2607—Cyclic extensions
    • 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) or 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

Landscapes

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

Abstract

ESTIMATIVA DE CANAL E TRANSMISSãO PILOTO PARA UM SISTEMA OFDM COM ESPALHAMENTO DE RETARDO EXCESSIVO. São descritas técnicas de transmissão piloto e estimativa de canal para um sistema OFDM com espalhamento de retardo excessivo. Para reduzir os efeitos prejuciciais do excesso de espalhamento de retardo, o número de sub-bandas piloto é maior do que o comprimento do prefixo cíclico. Tal "sobre-amostragem" pode ser conseguida pela utilização de mais sub-bandas piloto em cada período de símbolos ou diferentes conjuntos de sub-bandas piloto em diferentes períodos de símbolos. Em uma técnica de estimativa de canal, são obtidos um primeiro e um segundo grupos de símbolos piloto recebidos para um primeiro e um segundo conjuntos de sub-bandas piloto, respectivamente, que são utilizados para derivar uma primeira e uma segunda estimativas de resposta de freqüência, respectivamente. Uma primeira e uma segunda estimativas de resposta de impulso são derivadas com base nas primeira e segunda estimativas de resposta de freqüência, respectivamente, e são utilizadas para derivar uma terceira estimativa de resposta de impulso possuindo mais derivações do que número de sub-bandas piloto em qualquer dos conjuntos.
BRPI0418430-0A 2004-01-21 2004-12-07 Estimativa de canal e transmissão piloto para um sistema ofdm com espalhamento de retardo excessivo BRPI0418430B1 (pt)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
US53821004P 2004-01-21 2004-01-21
US60/538,210 2004-01-21
US10/821,706 2004-04-09
US10/821,706 US7339999B2 (en) 2004-01-21 2004-04-09 Pilot transmission and channel estimation for an OFDM system with excess delay spread
PCT/US2004/040959 WO2005076558A1 (en) 2004-01-21 2004-12-07 Pilot transmission and channel estimation for an ofdm system with excess delay spread

Publications (2)

Publication Number Publication Date
BRPI0418430A true BRPI0418430A (pt) 2007-05-22
BRPI0418430B1 BRPI0418430B1 (pt) 2018-08-07

Family

ID=34753131

Family Applications (1)

Application Number Title Priority Date Filing Date
BRPI0418430-0A BRPI0418430B1 (pt) 2004-01-21 2004-12-07 Estimativa de canal e transmissão piloto para um sistema ofdm com espalhamento de retardo excessivo

Country Status (13)

Country Link
US (3) US7339999B2 (pt)
EP (2) EP1714452B1 (pt)
JP (2) JP2007519368A (pt)
KR (1) KR100831126B1 (pt)
CN (2) CN103457897B (pt)
AR (1) AR047452A1 (pt)
AU (1) AU2004315369C1 (pt)
BR (1) BRPI0418430B1 (pt)
CA (1) CA2553746C (pt)
IL (1) IL176989A (pt)
RU (1) RU2348120C2 (pt)
TW (1) TWI353147B (pt)
WO (1) WO2005076558A1 (pt)

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RU2348120C2 (ru) 2009-02-27
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US20050157801A1 (en) 2005-07-21
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US20080152033A1 (en) 2008-06-26
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