WO2003065636A1 - Systeme a multitonalite discrete zipper et procede de mesure de l'avance temporelle au moyen de ce systeme - Google Patents

Systeme a multitonalite discrete zipper et procede de mesure de l'avance temporelle au moyen de ce systeme Download PDF

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Publication number
WO2003065636A1
WO2003065636A1 PCT/KR2002/000802 KR0200802W WO03065636A1 WO 2003065636 A1 WO2003065636 A1 WO 2003065636A1 KR 0200802 W KR0200802 W KR 0200802W WO 03065636 A1 WO03065636 A1 WO 03065636A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
sample
timing advance
onu
remote site
Prior art date
Application number
PCT/KR2002/000802
Other languages
English (en)
Inventor
Cheol-Jin Park
Jun-Beom Lee
Gi-Hong Im
Original Assignee
Huconex Co., Ltd.
Institute Information Technology Assessment
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 Huconex Co., Ltd., Institute Information Technology Assessment filed Critical Huconex Co., Ltd.
Priority to JP2003565097A priority Critical patent/JP2005516531A/ja
Publication of WO2003065636A1 publication Critical patent/WO2003065636A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0006—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format
    • H04L1/0007—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission format by modifying the frame length

Definitions

  • the present invention relates to a method for determining timing
  • the xDSL methods have evolved into the HDSL (high-data-rate DSL),
  • the SDSL single-line HDSL
  • the ADSL asymmetric DSL
  • the UADSL the SDSL (single-line HDSL)
  • the ADSL asymmetric DSL
  • the UADSL the SDSL (single-line HDSL)
  • Modulation and demodulation methods used for the xDSL include the
  • the DMT method divides a total transmission band into a plurality of
  • the method can realize high-speed modulation and demodulation
  • the biggest performance-lowering factors of the DMT system include
  • the near end crosstalk signals are a first near end crosstalk signals and echo signals.
  • the near end crosstalk signals are a first near end crosstalk signals and echo signals.
  • the echo signals are noise that affects signals received when the
  • the zipper DMT method has been developed to prevent the near end
  • the remote site Tx/Rx unit may concurrently transmit the signals.
  • the sample number of the cyclic suffixes is set to be greater
  • the timing advance is determined from a channel's
  • the channel's impulse response or transfer function is needed so as to
  • crosstalk signals and echo signals using a cyclic suffix with a minimum length are crosstalk signals and echo signals using a cyclic suffix with a minimum length.
  • a zipper DMT system in one aspect of the present invention, is a zipper DMT system
  • an ONU Tx/Rx unit including: a first Tx buffer for temporarily storing
  • a sample to be transmitted a sample to be transmitted; a first Tx sample counter for showing a first Tx
  • a first Rx buffer for temporarily storing a received
  • the ONU Tx/Rx unit for extracting a sample from the first Tx buffer
  • a remote site Tx/Rx unit including:
  • a second Tx buffer for temporarily storing a sample to be transmitted
  • Tx sample counter for showing a second Tx sample counter value for indicating
  • second Rx buffer for temporarily storing a received sample
  • second Rx sample counter for showing a second Rx sample counter value for indicating a
  • remote site Tx/Rx unit for extracting a sample from the second Tx buffer
  • Tx sample counter value Tx sample counter value
  • Tx/Rx unit by a first timing advance, and when receiving a second timing
  • the remote site Tx/Rx unit transmits a signal
  • the ONU Tx/Rx unit calculates the number of delayed samples in the
  • Tx/Rx unit determines the second timing advance in consideration of the
  • the ONU Tx/Rx unit and the remote site Tx/Rx unit updates a cyclic
  • the remote site Tx/Rx unit receiving a training start signal from the ONU Tx Rx unit, transmitting a
  • the (e) comprises updating a cyclic prefix with (the cyclic prefix + the
  • the (b) comprises determining the number of the delayed samples by
  • the (c) comprises determining the second timing advance through
  • TA - — - - ⁇ - — - where TA is the second timing advance, TA 0 is the first
  • ⁇ is the number of delayed samples
  • N ⁇ is a sample length
  • mod is a modulo operation
  • FIG. 1 shows a block diagram of a zipper DMT Tx/Rx (transmitting and
  • FIG. 2 shows a diagram for illustrating a sample number of a symbol
  • FIGs. 3(a) through 3(c) show a timing diagram of a method for
  • a zipper DMT system for determining timing advance and a method for
  • FIG. 1 shows a block diagram of a zipper DMT Tx/Rx (transmitting and
  • FIG. 2 shows a sample number of a symbol used by the zipper DMT Tx/Rx
  • the zipper Tx/Rx system comprises an ONU Tx/Rx
  • Tx/Rx units 100 and 200 are each independently rearranged in a remote site.
  • the Tx/Rx units 100 and 200 are independently rearranged.
  • UTP unshielded twisted pair
  • the Tx/Rx units 100 and 200 convert digital signals into physical layer
  • the Tx/Rx units 100 and 200 respectively comprise a transmitter
  • AFE analog front end
  • the transmitter 110 and 210 includes a Tx front-end controller 1 1 1 and
  • the Tx front-end controller 1 1 1 and 211 temporarily stores data IFFT-
  • the receiver 140 and 240 includes an Rx front-end controller 141 and
  • the Rx front-end controller 141 and 241 temporarily stores data provided
  • the receiving buffer 150 and 250 according to counting by the receiving sample
  • the AFE 170 and 270 converts digital signals provided by the
  • Tx/Rx unit 100 through the U2 interface 400 and 500, and also converts the
  • the symbol of the zipper DMT has L CP cyclic prefix samples, 2N SC samples, and
  • N T L CP + 2N SC +L CS
  • Tx sample count values OTxSampleCnt and RTxSampleCnt that are
  • count values of the transmission sample counters 130 and 230 represent
  • RTxSampleCntAtU2 from the U2 interfaces indicate positions, within the
  • Equation 2 Equation 2 in consideration of group delays ⁇ o ⁇ x and ⁇ RTX from
  • the activation (or handshake) step is a step for
  • the training step is a step for synchronizing symbols and training an equalizer.
  • the channel analysis and exchange step is a step for measuring an SNR
  • FIGs. 3(a) through 3(c) show a timing diagram of a method for
  • the ONU After performance of the initialization in the training step, the ONU
  • Tx/Rx unit 100 repeatedly transmits the O-SIGNATURE message to the remote
  • the O-SIGNATURE message that has fields including a
  • the remote site Tx/Rx unit 200 finishes symbol
  • the remote site Tx/Rx unit 200 receives an O-SIGNATURE message
  • the remote site Tx/Rx unit 200 repeatedly sends to the ONU
  • Tx/Rx unit 100 the R-MSG1 which is a confirmation message that the remote
  • the U2-R interface becomes 0, that is, the U2-R interface starts transmitting the R-MSG1. As a result, the U2-R interface transmits a Tx message in advance
  • equalizer starts to be converged, and a difference ⁇ of sample number
  • the ONU Tx/Rx unit 100 receives an
  • the ONU Tx/Rx unit 100 sends the O-
  • the O-UPDATE message includes a field for
  • TA is a corrected timing advance
  • TA 0 is a previous timing advance
  • N ⁇ is
  • the remote site Tx/Rx unit 200 receives an O-UPDATE message, and
  • sample counter value RTxSampleCnt becomes 0, the remote site Tx/Rx unit
  • the controller of the O ⁇ U Tx/Rx unit 100 sets
  • step S31 1 when the Tx sample count RTxSampleCnt is 0, the
  • controller of the remote site Tx/Rx unit 200 sets the new cyclic prefix and the
  • the O ⁇ U Tx/Rx unit 100 calculates the number of delayed samples
  • the timing advance can be determined by measuring the
  • O ⁇ U Tx/Rx unit and the remote site Tx/Rx unit can concurrently transmit and

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Communication Control (AREA)
  • Telephonic Communication Services (AREA)
  • Cable Transmission Systems, Equalization Of Radio And Reduction Of Echo (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

L'invention porte sur un procédé visant à déterminer une avance temporelle dans un système à multitonalité discrète zipper. Un émetteur/récepteur à distance reçoit un signal de départ d'entraînement d'un émetteur/récepteur de module de réseau optique et émet un signal de réponse par une première avance temporelle avant que l'intervalle d'échantillon du signal reçu soit terminé. A la réception du signal de réponse, l'émetteur/récepteur du module du réseau optique calcule un nombre d'échantillons en retard entre un intervalle de signal d'émission et un intervalle de signal de réception au niveau de l'émetteur/récepteur du module du réseau optique, détermine une seconde avance temporelle en fonction du nombre d'échantillons en retard et de la première avance temporelle et envoie la seconde avance temporelle à l'émetteur/récepteur à distance. Cet émetteur/récepteur à distance envoie un signal de réponse par une seconde avance temporelle avant que l'intervalle d'échantillon du signal reçu soit terminé.
PCT/KR2002/000802 2002-01-31 2002-04-30 Systeme a multitonalite discrete zipper et procede de mesure de l'avance temporelle au moyen de ce systeme WO2003065636A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2003565097A JP2005516531A (ja) 2002-01-31 2002-04-30 ジッパーディーエムティーシステム及びこのシステムにおけるタイミングアドバーンス決定方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2002/5704 2002-01-31
KR10-2002-0005704A KR100453766B1 (ko) 2002-01-31 2002-01-31 디엠티 시스템 및 이 시스템에서의 타이밍 어드밴스 결정 방법

Publications (1)

Publication Number Publication Date
WO2003065636A1 true WO2003065636A1 (fr) 2003-08-07

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PCT/KR2002/000802 WO2003065636A1 (fr) 2002-01-31 2002-04-30 Systeme a multitonalite discrete zipper et procede de mesure de l'avance temporelle au moyen de ce systeme

Country Status (4)

Country Link
JP (1) JP2005516531A (fr)
KR (1) KR100453766B1 (fr)
CN (1) CN1314218C (fr)
WO (1) WO2003065636A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2413468A (en) * 2004-04-19 2005-10-26 Texas Instruments Inc Frame alignment in a discrete multitone (DMT) system
GB2431323A (en) * 2004-04-19 2007-04-18 Texas Instruments Inc Frame alignment in a discrete multitone (DMT) system
US7418030B2 (en) 2004-02-11 2008-08-26 Texas Instruments Incorporated Flexible initialization method for DSL communication systems
US9084195B2 (en) 2010-04-01 2015-07-14 Nokia Technologies Oy Multiple timing advance and carrier aggregation

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* Cited by examiner, † Cited by third party
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CN103402146B (zh) * 2013-07-10 2016-06-01 上海交通大学 正交频分复用无源光网络的下行节能的传输系统

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7418030B2 (en) 2004-02-11 2008-08-26 Texas Instruments Incorporated Flexible initialization method for DSL communication systems
GB2413468A (en) * 2004-04-19 2005-10-26 Texas Instruments Inc Frame alignment in a discrete multitone (DMT) system
GB2431323A (en) * 2004-04-19 2007-04-18 Texas Instruments Inc Frame alignment in a discrete multitone (DMT) system
GB2431323B (en) * 2004-04-19 2008-04-02 Texas Instruments Inc Frame alignment and cyclic extension partitioning
US9084195B2 (en) 2010-04-01 2015-07-14 Nokia Technologies Oy Multiple timing advance and carrier aggregation
US9332512B2 (en) 2010-04-01 2016-05-03 Nokia Technologies Oy Multiple timing advance and carrier aggregation

Also Published As

Publication number Publication date
KR100453766B1 (ko) 2004-10-20
KR20030065198A (ko) 2003-08-06
CN1314218C (zh) 2007-05-02
JP2005516531A (ja) 2005-06-02
CN1505882A (zh) 2004-06-16

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