WO2008017274A1 - Procédé et dispositif pour contrôler la qualité de communication en ligne - Google Patents

Procédé et dispositif pour contrôler la qualité de communication en ligne Download PDF

Info

Publication number
WO2008017274A1
WO2008017274A1 PCT/CN2007/070411 CN2007070411W WO2008017274A1 WO 2008017274 A1 WO2008017274 A1 WO 2008017274A1 CN 2007070411 W CN2007070411 W CN 2007070411W WO 2008017274 A1 WO2008017274 A1 WO 2008017274A1
Authority
WO
WIPO (PCT)
Prior art keywords
water injection
transmission rate
iterative
data transmission
iterative water
Prior art date
Application number
PCT/CN2007/070411
Other languages
English (en)
Chinese (zh)
Inventor
Liming Fang
Original Assignee
Huawei Technologies Co., Ltd.
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 Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Publication of WO2008017274A1 publication Critical patent/WO2008017274A1/fr

Links

Classifications

    • 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
    • H04L1/0002—Systems modifying transmission characteristics according to link quality, e.g. power backoff by adapting the transmission rate
    • 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
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload

Definitions

  • the present invention relates to Digital Subscriber Line (DSL) technology, and in particular to a method and apparatus for controlling line communication quality.
  • DSL Digital Subscriber Line
  • DSL technology is a high-speed transmission technology for data transmission over telephone twisted pair, Unshielded Twist Pair (UTP), including Asymmetrical Digital Subscriber Line (ADSL), very high speed digital Very-high-bit-rate Digital Subscriber Line (VDSL), Integrated Services Digital Network (ISDN)-based Digital Subscriber Line (IDSL) and single-pair high-speed digital subscriber line ( Single-pair High-bit-rate Digital Subscriber Line, SHDSL), etc.
  • ADSL Asymmetrical Digital Subscriber Line
  • VDSL Very high speed digital Very-high-bit-rate Digital Subscriber Line
  • ISDN Integrated Services Digital Network
  • IDSL Integrated Services Digital Network
  • SHDSL Single-pair High-bit-rate Digital Subscriber Line
  • DSL with passband transmission utilizes frequency division multiplexing technology to enable DSL and traditional telephone services (Platform Old Telephone Service, POTS).
  • POTS Plan Old Telephone Service
  • the xDSL for passband transmission is modulated and demodulated using Discrete Multi-Tone Modulation (DMT) technology.
  • DMT Discrete Multi-Tone Modulation
  • a system that provides multiple DSL access is called a DSL Access Multiplexer (DSLAM).
  • the system diagram is shown in Figure 1.
  • the D SLAM 120 includes a client transceiver unit 121 and a split/integrator 122. In the uplink direction, the client transceiver unit 121 receives the DSL signal from the computer 110 and amplifies the received signal to transmit the processed DSL signal.
  • the split/integrator 122 will send and receive orders from the client
  • the DSL signal of element 121 and the POTS signal of telephone terminal 130 are integrated; the integrated signal is transmitted through multiplexed UTP 140, received by split/conformer 151 in the opposite DSLAM 150; the split/integrator 151 will receive
  • the signal is separated, and the POTS signal is sent to a Public Switched Telephone Network (PSTN) 160, and the DSL signal is sent to the central office transceiver unit 152 of the DSLAM 150.
  • PSTN Public Switched Telephone Network
  • NMS Network Management System
  • the signals are transmitted in the reverse order of the above.
  • BIT (bit) entries and GAIN (gain) entries are used to indicate the number of bits and transmit power that each subcarrier can carry. Bit swapping technology is mainly achieved by adjusting these two entries.
  • the BIT entry (bit table) is shown in Table 1:
  • Each bit table entry b represents the number of bits that can be carried by the corresponding subcarrier TONE on the xDSL line.
  • the standard stipulates that each item cannot exceed 15, and the size of the number of bits determines the line rate of the corresponding sub-band, and adjusts the bit table entry. The size of the sub-band can be changed.
  • the NSC in the table is short for Number of SubCarrier, which is the number of subcarriers.
  • a BIT table determines a unique line rate. Conversely, the line rate can be obtained by a number of different BIT entries. For some precondition, there is a unique optimal BIT table.
  • the GAIN entry (gain table) is shown in Table 2:
  • each gain entry g represents the data transmission power of the corresponding sub-band TONE on the xDSL line.
  • the size of the power determines the amount of data carried in the corresponding sub-band, and adjusts the size of the gain entry.
  • the data transmission power of the sub-band can be changed.
  • the user cable basically contains multiple pairs (25 pairs or more) of twisted pair, a variety of different services may be run on each twisted pair, and various types of xDSL may cause crosstalk between each other when working simultaneously. Some lines can experience a sharp drop in performance due to crosstalk. When the line is long, some lines cannot open any form of DSL service at all.
  • FIG. 2A and 2B are schematic diagrams of near-end crosstalk and far-end crosstalk in xDSL, respectively.
  • port 1 and port 2 of the DSLAM 210 are respectively connected to a remote terminal unit (RTU) 211 through a cable.
  • RTU remote terminal unit
  • NXT near-end crosstalk
  • the far end crosstalk is used. (FEXT) can seriously affect the transmission performance of the line.
  • FEXT Central Office/Remote Terminal
  • CO/RT Central Office/Remote Terminal
  • the short-line has a large influence on the crosstalk of the long line, and the influence of the second line 32 on the first line 31 in FIG. It is much larger than the influence of the first line 31 on the second line 32.
  • the signal transmission on each TONE can be independently expressed as:
  • Equation (2) represents the transfer function of the "th line” on the A-subcarrier; represents the m-th line The crosstalk function of the line on the Ath subcarrier; ⁇ indicates the noise power of the "the line on the A subcarrier; the transmission power of the "the line” on the A subcarrier; indicates the mth The transmit power of the line on the A-subcarrier.
  • DSM Dynamic Spectrum Management
  • the DSM automatically adjusts the transmission power on each modem in the network to achieve the purpose of eliminating crosstalk, that is, by adjusting the transmission power to achieve a maximum between each modem to achieve its own rate and reduce the crosstalk effect on other modems. balance.
  • DSM technologies include Iterative Water Filling (IFF) and Optimal Spectrum Balance (OSB).
  • IFF Iterative Water Filling
  • OSB Optimal Spectrum Balance
  • the IWF method only considers the influence of the change of "the transmission power of the A-th TONE on the user line” on the "user line rate", and does not consider the interference to other lines from the perspective of optimization.
  • the BIT table can be calculated based on the transmission power and the noise power of the receiving end. 420. When the transmit power spectrum on all TONEs has been found, the value is updated.
  • the rules for updating the value of ⁇ , ⁇ ⁇ are: First, determine whether the sum of the transmission powers of all TONEs has exceeded the total transmission power limit ( P « ). If not, press ( ⁇ 3 ⁇ 4! _ ) ]+ Update the A value, which indicates the target rate of the "strip channel; otherwise, press [/1 " ( ⁇ _ 3 ") ]+ to update the A value. Step 430, determine whether the updated value is the same as the previous value. If they are not the same, continue to execute the inner loop until the same, indicating that they have converged. The main purpose of the inner loop is to find the power that the corresponding modem should transmit and the corresponding number of transmittable bits when the target function takes the maximum value.
  • the second user (which may be the second user) is selected to repeat the above inner loop, and finally until the user used is completed in turn, and if the result of the first round does not converge, then the above process is continued until convergence.
  • N users cycle through the functions of the inner loop in a certain order. N users continuously cycle, and finally reach a balance point, which is a local optimal solution of the IWF.
  • each line is required to complete the search function of the power spectrum that maximizes the objective function in a certain order, that is, a water injection process.
  • a water injection process As shown in Figure 5, it can be in the ascending order of C01, C02, C03 to COn, or it can be decremented or any other specified order.
  • it means that you need an overall timing control circuit in the implementation process to complete the real-time timing control.
  • the sequential circuit is the internal control of the DSLAM 50; but if the CO end to be controlled is not in a DSLAM 50, then the interface between the DSLAMs must be provided, thereby making the entire implementation method very complicated.
  • the inventor has found through research that: if the entire iteration water injection has not been completed, if a certain line uses the data transmission corresponding to the BIT entry calculated by the loop in the line and the corresponding GAIN entry. The ability to communicate, then the other lines are still performing the iterative water injection process, while the transmission power of other lines is constantly changing during the iterative water injection process, and the resulting crosstalk is constantly changing. In other words, the signal-to-noise ratio of the line is constantly changing, which will lead to unstable operation of the line.
  • Embodiments of the present invention provide a method and apparatus for controlling communication quality of a line, which can prevent the user line modem from being unstable in communication while performing iterative water injection.
  • a method of controlling line communication quality includes the following steps:
  • the subscriber line modem determines the bit table Bi according to the transmission power of each subcarrier of each subscriber line generated by each water injection cycle;
  • the data transmission rate corresponding to the bit table entry in the Bi table is subtracted from the data transmission rate due to the noise increase margin, and a new Bi table is updated, and the data corresponding to the bit table entry in the new Bi table is updated.
  • the transmission rate transmits data on each subcarrier.
  • a method for controlling communication quality of a line characterized in that it comprises:
  • the subscriber line modem determines the bit table Bi according to the transmission power of each subcarrier of each subscriber line generated by each water injection cycle;
  • the data transmission rate corresponding to the bit table entry in the Bi table is subtracted from the data transmission rate due to the noise increase margin, and a new Bi table is updated, and the data corresponding to the bit table entry in the new Bi table is updated.
  • the transmission rate transmits data on each subcarrier.
  • a device for controlling the communication quality of a line comprising:
  • An iterative water injection unit for implementing a water injection cycle of iterative water injection of a subscriber line;
  • An obtaining unit configured to obtain a bit table Bi determined according to a transmission power of each subcarrier of each subscriber line generated by each water injection cycle of the iterative water injection unit;
  • an updating unit configured to subtract a data transmission rate corresponding to the bit increase in the Bi table obtained by the obtaining unit by a data transmission rate of the noise increase margin, and obtain a new Bi table
  • a transfer unit configured to implement the water injection cycle in the iterative water injection unit, to
  • the data transmission rate corresponding to the bit table entry in the Bi table transmits data on each subcarrier.
  • the user line modem transmits data at the same time in each iteration cycle of the iterative water injection, and the bit table item of the transmission data rate uses the maximum value of the target function ⁇ — ⁇ generated according to the water injection cycle of the iterative water injection.
  • the transmission power of each subcarrier TONE is subtracted from the margin due to the noise increase of other lines, which can avoid the instability of the operation of one user line when the data is transmitted during the iterative water injection due to other user line noise changes. problem.
  • FIG. 1 is a schematic diagram of an xDSL system in the prior art
  • FIGS. 2A and 2B are schematic diagrams of xDSL crosstalk in the prior art
  • FIG. 3 is a schematic diagram of crosstalk in a scenario of a CO/RT hybrid application in the prior art
  • FIG. 5 is a schematic diagram of an iterative water injection according to a certain timing in a plurality of user lines in the prior art
  • FIG. 6 is a flowchart of a method according to an embodiment of the present invention
  • FIG. 7 is a structural block diagram of an apparatus according to an embodiment of the present invention.
  • the user circuit is in the inner loop of the iterative water injection (the solution described in the embodiment of the present invention can be applied to the process of completing the iterative water injection in a certain order for each user line, and can also be applied to each The user line independently completes the iterative water injection process.
  • the water injection cycle is used to refer to the inner circulation of a certain subscriber line.
  • each data injection cycle simultaneously transmits data and transmits data.
  • the bit table is generated by each injection cycle according to the iterative water injection.
  • the function module for completing the iterative water injection process is located at the CO end, and the detailed process of the embodiment of the present invention is illustrated by taking a water injection cycle of a certain subscriber line as an example.
  • the CO and the Customer Premises Equipment are started, the handshaking, initialization, and other functions are completed in accordance with the relevant standards until the normal operation (showtime).
  • the relevant standard mentioned here means that if the CO and CPE support ADSL, the above process is completed by the ADSL standard. If the CO and CPE support the second generation VDSL (VDSL2), the VDSL2 standard is used to complete the above process.
  • VDSL2 the second generation VDSL
  • the CO and CPE complete the above process, they obtain parameters such as a Bi (BIT) table, a Gi (GAIN) table, and noise of each subcarrier.
  • the implementation process of the iterative water injection described in the embodiment of the present invention is as shown in FIG. 6, and includes the following steps:
  • the subscriber line (assumed to be the first subscriber line) simultaneously transmits data, and at this time, the modem of the subscriber line uses the entries in the Gi table obtained by the above initialization process as the transmission power of each TONE for transmitting data.
  • the table in the Bi table obtained by the above initialization process is subtracted from the value of the noise increase of other lines Binew as the transmission rate of each TONE transmitting the data;
  • the subscriber line begins to iterate the water injection cycle of the water, for each TONE of the user
  • the modem of the subscriber line uses a new Bi table entry minus a value due to the noise increase of other lines.
  • Binew is used as the transmission rate of each TONE for transmitting data, and uses the entry in the new Gi table.
  • the subscriber line begins to iterate the next water injection cycle of water injection, only after iterative water injection
  • a new Bi table can be calculated, and a new Gi table can be obtained.
  • the modem of the user line uses the latest water injection cycle.
  • the new Bi table entry is subtracted from the value of the noise increase of other lines Binew as the transmission rate of each TONE transmitting the data, and the entry in the new Gi table obtained in step 601 is used as the transmission data.
  • Each TONE transmits power, and the subscriber line enters normal operation;
  • step 602 is repeated, and each time the user line performs an iterative water injection cycle to obtain a new Bi and Gi, the modem of the subscriber line uses the updated Binew and Gi to complete the data transfer.
  • the first scheme Compare the transmit power variance or the bit number variance of two adjacent times before and after
  • the convergence condition is directly judged. If the convergence modem is used, the Bi table is used directly. If the modem is not converged, the Binew table is used.
  • the variance of the two Bi tables is ( . - 32 ; ) 2 . If the variance value is less than or equal to the determined threshold, for example 1, the iteration is considered to have converged. In order to further confirm whether the convergence is convergent, the variance value may be calculated multiple times (for example, 7 times). When the variance values of the plurality of consecutive times satisfy the condition, it is judged that the iteration water injection has converged. When it is judged that the iterative water injection has converged, the final Gi and Bi tables are used for normal work.
  • the second scheme Determine whether to converge in the process of calculating the Binew table from the Bi table.
  • the convergence condition is not directly judged, and the judgment of the convergence condition is expressed in the process of calculating Binew from the Bi table.
  • the calculated Binew table converges to the Bi table according to the convergence of the iterative water injection. In other words, when the iteration water converges, the calculated Binew table is basically equal to the Bi table.
  • ⁇ The sum is the transmission power spectrum calculated twice before and after.
  • the water injection volume should be basically the same before and after, so that ⁇ . is basically close to zero.
  • the storage medium is, for example, a ROM/RAM, a magnetic disk, an optical disk, or the like.
  • FIG. 7 is a structural block diagram of an apparatus according to an embodiment of the present invention, including an iterative water injection unit 710, The obtaining unit 720, the updating unit 730, and the transmitting unit 740: wherein:
  • An iterative water injection unit 710 which implements a water injection cycle process of iterative water injection of the user line;
  • the obtaining unit 720 is configured to obtain a Bi table determined according to a transmit power of each subcarrier of each user line generated by each water injection cycle of the iterative water injection unit 710;
  • the updating unit 730 is configured to update the data transmission rate corresponding to the bit table entry in the Bi table acquired by the obtaining unit 720 by the data transmission rate due to the noise increase margin, and update the new Bi table, that is,
  • the data transmission rate due to noise increase margin is a value corresponding to two bits
  • the transfer unit 740 in the process of implementing the water injection cycle by the iterative water injection unit 710, to update the unit
  • the data transmission rate corresponding to the bit table entry in the Binew table obtained by 730 transmits data on each subcarrier.
  • the foregoing embodiment may further include a determining unit 750, configured to determine whether the iterative water injection is converged; when the determining unit 750 determines that the iterative water injection does not converge, the obtaining unit 720 generates each of the current water injection cycles according to the iterative water injection.
  • a determining unit 750 configured to determine whether the iterative water injection is converged; when the determining unit 750 determines that the iterative water injection does not converge, the obtaining unit 720 generates each of the current water injection cycles according to the iterative water injection.
  • the transmitting unit 740 transmits data on each subcarrier in a data transmission rate corresponding to the bit table entry in the Binew table obtained by the updating unit 730 in the process of implementing the water injection cycle by the iterative water injection unit 710; When determining the iterative water injection convergence, the transmitting unit 740 directly transmits data on each subcarrier with the data transmission rate corresponding to the bit table entry in the Bi table determined by the obtaining unit 720.
  • the determining unit 740 may determine whether to converge by comparing the power consumption variances of two adjacent transmission powers, or whether the data transmission rate variance corresponding to the bit table entries in the Bi table is less than or equal to the determined threshold value, for example, whether the variance value is compared. Less than or equal to 1, if yes, it is determined that the iteration water injection has converged; otherwise Make sure the iteration water injection does not converge.
  • the updating unit 730 may subtract the data transmission rate corresponding to the bit table entry in the Bi table generated by the initialization by the noise increase margin. The amount of data transfer rate is updated to get the Binew table.
  • the process of iterative water injection is that each user line is completed in a certain order, but according to the theory of the game, the water injection process is not completed in accordance with the prescribed order (each user line is completed independently at the same time).
  • the water injection process also achieves the final equilibrium point, and the convergence of the entire iterative process is faster, meaning that the entire process can be completed in a shorter time than the sequential method described above.
  • the user line modem transmits data at the same time in each iteration cycle of the iterative water injection, and the bit table item of the transmission data rate uses the maximum value of the target function ⁇ — ⁇ generated according to the water injection cycle of the iterative water injection.
  • the transmission power of each subcarrier TONE is subtracted from the margin due to the noise increase of other lines, which can avoid the instability of the operation of one user line when the data is transmitted during the iterative water injection due to other user line noise changes. problem.
  • the technical solution described in the embodiments of the present invention can be applied to the process of completing the iterative water injection in turn in each user route of the iterative water injection in a certain order, or applicable to the completion of the water injection process in the order of each user line.

Landscapes

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

Abstract

L'invention concerne un procédé et un dispositif pour commander la qualité de communication en ligne. Dans le procédé, le modem de ligne de souscripteur transmet des données pendant le remplissage d'eau itératif, et son débit de transmission de données adoptent le débit de transmission de données déterminé par la ligne de souscripteur qui a été dégradé pendant chaque cycle de remplissage d'eau du remplissage d'eau itératif. Un mode de réalisation de l'invention surmonte les inconvénients de la technique antérieure, le modem de ligne de souscripteur transmet des données pendant chaque cycle de remplissage d'eau du remplissage d'eau itératif, une table de bits correspondant à son débit de transmission de données adopte la sur-mesure qui est constituée des puissances de transmission Skn du sous-porteur respectif TONE survenues pendant chaque cycle de remplissage du remplissage d'eau itératif, et qui fait que la valeur de la fonction objective Wn Bkn - λn Skn est la plus importante moins la puissance sonore d'autres lignes qui a été augmentée. Par conséquent, le problème d'instabilité de travail provoqué par un changement de bruit d'autres lignes de souscripteur lorsqu'une certaine ligne de souscripteur transmet des données pendant le remplissage d'eau itératif peut être évité.
PCT/CN2007/070411 2006-08-04 2007-08-03 Procédé et dispositif pour contrôler la qualité de communication en ligne WO2008017274A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN200610062019.4 2006-08-04
CN2006100620194A CN101119134B (zh) 2006-08-04 2006-08-04 一种控制线路通讯质量的方法

Publications (1)

Publication Number Publication Date
WO2008017274A1 true WO2008017274A1 (fr) 2008-02-14

Family

ID=39032650

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2007/070411 WO2008017274A1 (fr) 2006-08-04 2007-08-03 Procédé et dispositif pour contrôler la qualité de communication en ligne

Country Status (2)

Country Link
CN (1) CN101119134B (fr)
WO (1) WO2008017274A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014201662A1 (fr) * 2013-06-20 2014-12-24 华为技术有限公司 Procédé, dispositif et système d'initialisation de ligne

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050259725A1 (en) * 2004-05-18 2005-11-24 Adaptive Spectrum And Signal Alignment, Inc. FEXT determination system

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1125369B1 (fr) * 1998-10-27 2004-03-24 Roke Manor Research Limited Procede et l' appareil d'extraction amelioree dans des systemes amcr
CN100336311C (zh) * 2004-02-12 2007-09-05 中兴通讯股份有限公司 一种解决数字用户线路远端串扰的方法

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050259725A1 (en) * 2004-05-18 2005-11-24 Adaptive Spectrum And Signal Alignment, Inc. FEXT determination system
WO2005114861A1 (fr) * 2004-05-18 2005-12-01 Adaptive Spectrum And Signal Alignment, Inc. Systeme de mesure de fext

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ZHAOYONGGANG Z.: "A Method of VDSL Upstream Adaptive Power Back-off Technology", JIANGSU COMMUNICATION TECHNOLOGY, vol. 19, no. 5, October 2003 (2003-10-01) *

Also Published As

Publication number Publication date
CN101119134B (zh) 2011-01-05
CN101119134A (zh) 2008-02-06

Similar Documents

Publication Publication Date Title
WO2008052485A1 (fr) Procédé et dispositif de gestion du spectre de fréquences
EP1863249B1 (fr) Procédé et dispositif pour la gestion dynamique du spectre de fréquence xDSL partagée en amont et en aval
US20190165833A1 (en) Training optimization of multiple lines in a vectored system using a prepared-to-join group
WO2007098674A1 (fr) Procédé et dispositif d'obtention d'informations sur la diaphonie
WO2007033579A1 (fr) Procede et organe de reglage de puissance adaptative fondee sur la reduction de diaphonie parmi les lignes dsl
WO2009039759A1 (fr) Procédé et dispositif servant à contrôler la puissance de transmission d'une ligne dsl
WO2014032260A1 (fr) Procédé, dispositif et système compatibles avec un équipement final d'utilisateur classique vdsl2
WO2008113280A1 (fr) Procédé de détermination et dispositif correspondant, ainsi que procédé de configuration et système correspondant, destinés au bruit virtuel de référence dans dsl
CN101610102A (zh) 一种优化功率的方法、系统和装置
CN103004099A (zh) 一种降低数字用户线路干扰的方法、装置和系统
WO2010139286A1 (fr) Procédé et dispositif destinés à l'estimation d'une voie de télédiaphonie
CN102257797A (zh) 数字用户线系统的发射机噪声级动态调整
US9258790B2 (en) Dynamic power spectrum management method, spectrum optimization system and client device
US8243844B2 (en) Power reduction for digital subscriber line
US7839919B2 (en) Adjusting transmit power spectra of transceiver devices in a communications network
CN101729094B (zh) 数字用户线中上行功率下调方法、装置及系统
EP1804450A1 (fr) Allocation de données dans un système multiporteuse de ligne d'abonné numérique
WO2008017274A1 (fr) Procédé et dispositif pour contrôler la qualité de communication en ligne
KR20120012460A (ko) Ｄｍｔ 모뎀들에서 다이나믹 레인지를 최적화하는 방법 및 장치
EP3127311A1 (fr) Système de gestion de ligne dynamique
US20110134975A1 (en) Method and device for data processing and communication system comprising such device
den Bogaert et al. ADSL transceivers applying DSM and their nonstationary noise robustness
WO2008061449A1 (fr) Procédé et dispositif de gestion d'une matrice de canal
EP2146496B1 (fr) Procédé et dispositif de traitement de données et système de communication comprenant un tel dispositif
JACOBSEN Last Mile Copper Access

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 07785407

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

NENP Non-entry into the national phase

Ref country code: RU

122 Ep: pct application non-entry in european phase

Ref document number: 07785407

Country of ref document: EP

Kind code of ref document: A1