AR047452A1 - Un metodo para estimar una respuesta de frecuencia de un canal inalambrico en un sistema de comunicaciones inalambrico y un aparato que utiliza dicho metodo - Google Patents

Un metodo para estimar una respuesta de frecuencia de un canal inalambrico en un sistema de comunicaciones inalambrico y un aparato que utiliza dicho metodo

Info

Publication number
AR047452A1
AR047452A1 ARP050100236A ARP050100236A AR047452A1 AR 047452 A1 AR047452 A1 AR 047452A1 AR P050100236 A ARP050100236 A AR P050100236A AR P050100236 A ARP050100236 A AR P050100236A AR 047452 A1 AR047452 A1 AR 047452A1
Authority
AR
Argentina
Prior art keywords
frequency response
estimating
estimates
appliance
channel
Prior art date
Application number
ARP050100236A
Other languages
English (en)
Inventor
Dhananjay A 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 AR047452A1 publication Critical patent/AR047452A1/es

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
    • 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
    • H04L25/0224—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
    • 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), 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

Técnicas para la transmision de pilotos y para la estimacion del canal para un sistema de OFDM con distribucion en exceso de la demora. A efectos de mitigar los efectos perjudiciales de la distribucion en exceso de la demora, la cantidad de subbandas de pilotos es mayor que la longitud del prefijo cíclico. Este ôsobremuestreoö puede lograrse mediante la utilizacion de más símbolos de piloto en cada período de símbolos o conjuntos diferentes de subbandas de pilotos en períodos de símbolo diferentes. En una técnica para la estimacion del canal, se obtienen grupos primero y segundo de símbolos de piloto recibidos para los conjuntos de subbandas de pilotos primero y segundo, respectivamente, y se los utiliza para derivar estimaciones primera y segunda de la respuesta de frecuencia, respectivamente. Se derivan estimaciones primera y segunda de la respuesta de impulso sobre la base de las estimaciones primera y segunda de la respuesta de frecuencia, respectivamente, y se las utiliza para derivar una tercera estimacion de la respuesta de impulso que tiene más taps que la cantidad de subbandas de pilotos en cualquiera de los conjuntos.
ARP050100236A 2004-01-21 2005-01-21 Un metodo para estimar una respuesta de frecuencia de un canal inalambrico en un sistema de comunicaciones inalambrico y un aparato que utiliza dicho metodo AR047452A1 (es)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US53821004P 2004-01-21 2004-01-21
US10/821,706 US7339999B2 (en) 2004-01-21 2004-04-09 Pilot transmission and channel estimation for an OFDM system with excess delay spread

Publications (1)

Publication Number Publication Date
AR047452A1 true AR047452A1 (es) 2006-01-18

Family

ID=34753131

Family Applications (1)

Application Number Title Priority Date Filing Date
ARP050100236A AR047452A1 (es) 2004-01-21 2005-01-21 Un metodo para estimar una respuesta de frecuencia de un canal inalambrico en un sistema de comunicaciones inalambrico y un aparato que utiliza dicho metodo

Country Status (13)

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

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IL176989A (en) 2010-12-30
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WO2005076558A1 (en) 2005-08-18
US20050157801A1 (en) 2005-07-21
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CN103457897B (zh) 2016-12-28
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US7339999B2 (en) 2008-03-04
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IL176989A0 (en) 2006-12-10
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US8537908B2 (en) 2013-09-17
RU2348120C2 (ru) 2009-02-27
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