WO2006063424A1 - Synchronisation dans un systeme de multiplexage par repartition en frequence orthogonale (ofdm) a multiples entrees/multiples sorties (mimo) pour applications sans fil - Google Patents

Synchronisation dans un systeme de multiplexage par repartition en frequence orthogonale (ofdm) a multiples entrees/multiples sorties (mimo) pour applications sans fil Download PDF

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Publication number
WO2006063424A1
WO2006063424A1 PCT/CA2004/002125 CA2004002125W WO2006063424A1 WO 2006063424 A1 WO2006063424 A1 WO 2006063424A1 CA 2004002125 W CA2004002125 W CA 2004002125W WO 2006063424 A1 WO2006063424 A1 WO 2006063424A1
Authority
WO
WIPO (PCT)
Prior art keywords
sub
frequency offset
calculating
carrier
mimo
Prior art date
Application number
PCT/CA2004/002125
Other languages
English (en)
Inventor
Jianglei Ma
Wen Tong
Shiquan Wu
Original Assignee
Nortel Networks Limited
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 Nortel Networks Limited filed Critical Nortel Networks Limited
Priority to PCT/CA2004/002125 priority Critical patent/WO2006063424A1/fr
Publication of WO2006063424A1 publication Critical patent/WO2006063424A1/fr

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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
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2656—Frame synchronisation, e.g. packet synchronisation, time division duplex [TDD] switching point detection or subframe synchronisation
    • 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
    • H04L27/2657—Carrier synchronisation
    • H04L27/2659—Coarse or integer frequency offset determination and synchronisation
    • 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
    • H04L27/2657—Carrier synchronisation
    • H04L27/266—Fine or fractional frequency offset determination and synchronisation
    • 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
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals

Definitions

  • the OFDM data frames are transmitted serially by an RF transmitter, which typically includes an IF bandpass filter, an RF mixer, a local oscillator, an RF bandpass filter, an RF power amplifier, and an antenna.
  • an RF transmitter typically includes an IF bandpass filter, an RF mixer, a local oscillator, an RF bandpass filter, an RF power amplifier, and an antenna.
  • the receiving base stations may begin to operate alter the transmitting stations have been transmitting for some lime, the first signal received at the receiving base station may not be the first signal transmitted by the transmitting base station. Thus, in such circumstances synchronization is carried out to determine the appropriate start and end points of the transmitted data stream.
  • the RF carrier frequency oscillator in the RJF transmitter is not identical to the RJF carrier frequency oscillator in the RF receiver.
  • the mismatch between oscillators results in a frequency offset which causes a loss of orthogonality between the OFDM sub-carriers and results in inter-carrier interference between sub-carriers as well as a large increase in the bit error rate (BBR) of the recovered data at the receiver.
  • BBR bit error rate
  • the clock sampling rate at the OFDM transmitter is not identical to the clock sampling rate at the OFDM receiver which creates a sampling clock offset, that adds to the frequency offset. Both the frequency offset and the sampling clock offset are corrected prior to extracting data from the samples received.
  • R train is the received training symbol in the frequency domain
  • k min is the index of the first useful sub-carrier
  • k max is the last useful sub-carrier
  • K max is a value obtained from the expected maximum frequency offset and is based on the precision of the reference frequency.
  • the respective offsets may be estimated for each MIMO channels.
  • the final frequency offset and sampling clock offset estimations may then be determined by averaging the results obtained from the different MIMO channels.
  • the tracking of the frequency offset and sampling clock offset is achieved by using continual pilots.
  • a Fast Fourier Transform may be performed on the OFDM sub-symbols, again converting the value into complex-valued sub-symbols in the frequency domain, These complex valued sub-symbols may be decoded so that the original A bits of data may be recovered.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Radio Transmission System (AREA)

Abstract

L'invention concerne un procédé de synchronisation temporelle de signaux de multiplexage par répartition en fréquence orthogonale (OFDM) dans un système à multiples entrées/multiples sorties (MIMO). Le procédé consiste à transmettre à partir d'une pluralité d'émetteurs une pluralité de trames de données, chaque trame contenant un préambule et au moins un symbole, ledit préambule contenant au moins une sous-porteuse pilote et au moins un symbole d'entraînement, à recevoir au niveau d'une pluralité de récepteurs lesdites trames, à exécuter au niveau de chaque récepteur un algorithme de synchronisation approximatif à l'aide d'un corrélateur par glissement simple, et à exécuter un algorithme de synchronisation précis, permettant la corrélation d'un préambule d'une seule trame de données et d'un préambule stocké au niveau de chaque récepteur. L'invention concerne également un procédé de détermination du décalage de fréquence et du décalage d'horloge d'échantillonnage des signaux reçus. Pour chaque canal MIMO, un décalage de fréquence total est calculé par addition d'un multiple d'un décalage de fréquence de l'espacement de la sous-porteuse et d'un décalage de fréquence d'une fraction de l'espacement de la sous-porteuse, et un décalage de fréquence moyen des canaux MIMO est déterminée par la moyenne de tous les décalages de fréquence. Le décalage d'horloge d'échantillonnage est calculé par corrélation de deux symboles d'apprentissage identiques.
PCT/CA2004/002125 2004-12-14 2004-12-14 Synchronisation dans un systeme de multiplexage par repartition en frequence orthogonale (ofdm) a multiples entrees/multiples sorties (mimo) pour applications sans fil WO2006063424A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/CA2004/002125 WO2006063424A1 (fr) 2004-12-14 2004-12-14 Synchronisation dans un systeme de multiplexage par repartition en frequence orthogonale (ofdm) a multiples entrees/multiples sorties (mimo) pour applications sans fil

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CA2004/002125 WO2006063424A1 (fr) 2004-12-14 2004-12-14 Synchronisation dans un systeme de multiplexage par repartition en frequence orthogonale (ofdm) a multiples entrees/multiples sorties (mimo) pour applications sans fil

Publications (1)

Publication Number Publication Date
WO2006063424A1 true WO2006063424A1 (fr) 2006-06-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CA2004/002125 WO2006063424A1 (fr) 2004-12-14 2004-12-14 Synchronisation dans un systeme de multiplexage par repartition en frequence orthogonale (ofdm) a multiples entrees/multiples sorties (mimo) pour applications sans fil

Country Status (1)

Country Link
WO (1) WO2006063424A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016000310A1 (fr) * 2014-06-30 2016-01-07 深圳市中兴微电子技术有限公司 Procédé et appareil pour détecter un en-tête de trame à chemins multiples

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020041635A1 (en) * 2000-09-01 2002-04-11 Jianglei Ma Preamble design for multiple input - multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system
US20020122382A1 (en) * 2000-09-01 2002-09-05 Jianglei Ma Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications
US20030072255A1 (en) * 2001-10-17 2003-04-17 Jianglei Ma System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20020041635A1 (en) * 2000-09-01 2002-04-11 Jianglei Ma Preamble design for multiple input - multiple output (MIMO), orthogonal frequency division multiplexing (OFDM) system
US20020122382A1 (en) * 2000-09-01 2002-09-05 Jianglei Ma Synchronization in a multiple-input/multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system for wireless applications
US20030072255A1 (en) * 2001-10-17 2003-04-17 Jianglei Ma System access and synchronization methods for MIMO OFDM communications systems and physical layer packet and preamble design

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2016000310A1 (fr) * 2014-06-30 2016-01-07 深圳市中兴微电子技术有限公司 Procédé et appareil pour détecter un en-tête de trame à chemins multiples

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