WO2009140890A1 - Procédé, système et dispositif mettant en œuvre une synchronisation de symboles - Google Patents

Procédé, système et dispositif mettant en œuvre une synchronisation de symboles Download PDF

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Publication number
WO2009140890A1
WO2009140890A1 PCT/CN2009/071662 CN2009071662W WO2009140890A1 WO 2009140890 A1 WO2009140890 A1 WO 2009140890A1 CN 2009071662 W CN2009071662 W CN 2009071662W WO 2009140890 A1 WO2009140890 A1 WO 2009140890A1
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Prior art keywords
signal
synchronization
symbol period
start position
transceiver
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PCT/CN2009/071662
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English (en)
Chinese (zh)
Inventor
石操
方李明
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华为技术有限公司
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Publication of WO2009140890A1 publication Critical patent/WO2009140890A1/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
    • H04L27/2626—Arrangements specific to the transmitter only
    • 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
    • H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
    • H04L25/03006—Arrangements for removing intersymbol interference
    • H04L25/03343—Arrangements at the transmitter end
    • 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
    • H04L27/2662—Symbol synchronisation
    • 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
    • H04L5/0037—Inter-user or inter-terminal allocation
    • 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
    • H04L5/0058—Allocation criteria
    • H04L5/0062—Avoidance of ingress interference, e.g. ham radio channels

Definitions

  • Embodiments of the present invention relate to the field of communications technologies, and in particular, to a method, system, and apparatus for implementing symbol synchronization. Background technique
  • Digital Subscriber Line (DSL) technology is a high-speed transmission technology for data transmission over a telephone twisted pair, Unshielded Twist Pair (UTP), including Asymmetric Digital Subscriber Line (Asymmetrical Digital). Subscriber Line, ADSL), Very-high-bit-rate Digital Subscriber Line (VDSL), ISDN Digital Subscriber Line (IDSL) based on Integrated Services Digital Network (ISDN) ) and Single-pair High-bit-rate Digital Subscriber Line (SHDSL).
  • ADSL Asymmetric Digital Subscriber Line
  • VDSL Very-high-bit-rate Digital Subscriber Line
  • IDSL ISDN Digital Subscriber Line
  • ISDN Integrated Services Digital Network
  • SHDSL Single-pair High-bit-rate Digital Subscriber Line
  • DSL using passband transmission utilizes frequency division multiplexing technology to enable DSL and Plain Old Telephone Service (POTS). Coexisting on the same pair of twisted pairs, where DSL occupies a high frequency band, POTS occupies a baseband portion below 4 kHz, and POTS signals and DSL signals are separated or combined by a splitter/integrator (Splitter).
  • the passband transmission xDSL uses Discrete Multi-Tone Modulation (DMT) technology for modulation and demodulation.
  • DMT Discrete Multi-Tone Modulation
  • the physical layer of the xDSL technology uses Orthogonal Frequency Divided Multiple (OFDM) technology, in one symbol (another Within the time range of the term "frame", a set of mutually orthogonal subcarriers are transmitted to carry bit information.
  • OFDM Orthogonal Frequency Divided Multiple
  • the transceiver needs to use the symbol synchronization method to find the starting position of the symbol in the received signal and demodulate the received symbol.
  • DSM Dynamic Spectral Management
  • the signal level DSM mainly includes Multi-Input and Multi-Output (MIMO), Vectored DSL (Vector DSL) and so on.
  • MIMO Multi-Input and Multi-Output
  • Vector DSL technology has much in common with MIMO technology.
  • MIMO Multi-Input and Multi-Output
  • MIMO Vectored DSL technology
  • MIMO is the best performing digital subscriber line technology.
  • MIMO technology still uses the currently popular OFDM, and the OFDM modulation technology is as follows:
  • OFDM orthogonal frequency division multiplexing
  • each xDSL modem treats the interference of other modems as noise, and the data rate ( b k" ) that can be reached on the kth tone of the nth user can be calculated by the Shannon channel capacity formula. :
  • ' represents the transfer function of the nth line on the kth subcarrier.
  • the crosstalk function for the nth line on the kth subcarrier is indicated by the mth line.
  • the rate calculation formula of the entire DSM is based on each subcarrier, which is mainly due to the orthogonality of the subcarriers. If the orthogonality of each subcarrier is destroyed. All DSM algorithms are subject to change. The algorithms listed above (including optimization of DSM technology and crosstalk cancellation by MIMO, Vectored DSL technology, etc.) cannot be used in this case.
  • the second line is not synchronized with the first line symbol.
  • the first line performs OFDM demodulation, part of the signals of frame 1 and frame 2 in the second line are processed.
  • both window 2 and window 3 are shorter than the normal OFDM signal window (as shown in window 1), so that the window 1 and window 2 window 3 produce different spectral widths (see Figure 3), thus destroying the orthogonality of the frequency. Sex. That is to say, signals between different frequencies will also interfere with each other. Summary of the invention
  • Embodiments of the present invention propose a method for implementing symbol synchronization to ensure frame synchronization of each line, thereby avoiding the occurrence of disruption of orthogonality.
  • an embodiment of the present invention provides a method for implementing symbol synchronization, including:
  • the signal is sent at the start of the symbol period after synchronization.
  • An embodiment of the present invention further provides a communication device, including:
  • a first acquiring module configured to acquire a symbol period start position of the crosstalk signal
  • a synchronization module configured to synchronize a symbol period start position of the pre-transmitted signal to a symbol period start position of the crosstalk signal acquired by the first acquiring module ;
  • the sending module is configured to send a signal according to a symbol period start position of the signal synchronized by the synchronization module.
  • An embodiment of the present invention further provides a synchronization center manager, including: a selection module, configured to select a transceiver to issue a synchronization guiding signal, and send a synchronization guiding signal request to the selected transceiver;
  • an information statistics module configured to receive and collect the acquisition information reported by the transceiver; a timer, configured to: when the acquisition information statistics module does not receive the acquisition information reported by the transceiver within a predetermined time, prompting the selecting The module reselects the transceiver to transmit the synchronization pilot signal.
  • An embodiment of the present invention further provides a system for implementing symbol synchronization, including: a synchronization center manager, configured to select a transceiver to send a synchronization pilot signal, and after receiving the reported acquisition information, statistics and store the acquisition information, where When the acquisition information is not received within the predetermined time, the transceiver is selected to transmit the synchronization pilot signal in the transceiver that does not report the acquisition information or does not send the synchronization pilot signal.
  • a synchronization center manager configured to select a transceiver to send a synchronization pilot signal, and after receiving the reported acquisition information, statistics and store the acquisition information, where When the acquisition information is not received within the predetermined time, the transceiver is selected to transmit the synchronization pilot signal in the transceiver that does not report the acquisition information or does not send the synchronization pilot signal.
  • a transceiver configured to acquire a symbol period start position of the crosstalk signal, synchronize a symbol period start position of the pre-transmitted signal to a symbol period start position of the crosstalk signal, and send according to a symbol period start position of the synchronized signal signal.
  • DRAWINGS 1 is a schematic diagram of an OFDM subcarrier in the prior art of the present invention
  • FIG. 3 is a schematic flowchart of a method for implementing symbol synchronization in Embodiment 1 of the present invention
  • FIG. 4 is a schematic diagram of detecting a near-end crosstalk symbol in Embodiment 2 of the present invention
  • FIG. 5 is a schematic diagram of a synchronization center management system according to Embodiment 3 of the present invention
  • FIG. 6 is a schematic diagram of a synchronous pilot signal transmission and relay in the third embodiment of the present invention
  • FIG. 7 is a schematic diagram of a state of a synchronous center manager controlling a transceiver according to Embodiment 3 of the present invention
  • FIG. 8 is a schematic diagram of symbol synchronization of a pilot signal relay scheme according to Embodiment 3 of the present invention.
  • FIG. 9 is a schematic structural diagram of an apparatus for implementing symbol synchronization by a near-end crosstalk signal according to an embodiment of the present invention.
  • FIG. 10 is a schematic structural diagram of a system and apparatus for implementing symbol synchronization by using a synchronization pilot signal according to an embodiment of the present invention. detailed description
  • Embodiments of the present invention provide a method, system, and apparatus for implementing symbol synchronization, which effectively implement signal synchronization between lines; solve the problem of orthogonal frequency division multiplexing signal synchronization, and ensure orthogonal frequency division multiplexing Orthogonality in multiplexing signal transmission.
  • Crosstalk is an inevitable product of modern digital systems. It is the coupling between two signal lines. The mutual inductance and mutual capacitance between signal lines cause noise on the line. Capacitive coupling induces a coupled current, while inductive coupling induces a coupled voltage. PCB board layer parameters, signal line spacing, electrical characteristics of the driver and receiver, and line termination have a certain impact on crosstalk.
  • the first embodiment of the present invention provides a method for implementing symbol synchronization. As shown in FIG. 3, the method includes the following steps: Step S301: Acquire a symbol period start position of the crosstalk signal.
  • the symbol period start position of the near-end crosstalk signal may be obtained, or the symbol period start position of the crosstalk signal caused by the synchronization pilot signal sent by the transceiver may be acquired.
  • the symbol period start position of the signal sent by the group transceiver may be the same as the symbol period start position of the crosstalk signal caused by the group, so that the symbol period of the signal sent by the group transceiver is The starting position is consistent, which avoids the crosstalk caused by each transceiver transmitting signals at the same time.
  • Step S302 Synchronize the symbol period start position of the pre-transmitted signal to the symbol period start position of the crosstalk signal.
  • the pre-transmitted signal may be an orthogonal frequency division multiplexed signal, or may be a CDMA signal or a pulse signal or other custom signals.
  • Step S303 Send a signal according to the start position of the symbol period after synchronization.
  • the second embodiment of the present invention applies the first embodiment to a specific scenario, and uses the symbol period start position of the near-end crosstalk signal to transmit the orthogonal frequency division multiplexing signal.
  • the specific process is as follows:
  • the transceiver VTU (the terminal transceiver is VTU-0, the client transceiver is VTU-R, the transceiver can be the digital subscriber line access multiplexer DSLAM) detects near-end crosstalk during the initialization phase, and transmits it through the transceiver.
  • the symbol period start position of the orthogonal frequency division multiplexed signal is synchronized with the symbol period start position of the near-end crosstalk signal, and symbol synchronization between the lines is realized.
  • FIG. 4 is a schematic diagram of detecting a near-end crosstalk signal in the second embodiment. As shown in the figure, the symbol period of the near-end crosstalk signal 1000 is the same as the symbol period of the OFDM.
  • the implementation of this embodiment is as follows:
  • the transceiver acquires the symbol period start position 2000 of the near-end crosstalk signal.
  • the transceiver is based on a symbol period start position of the near-end crosstalk signal
  • the transceiver transmits the orthogonal frequency division multiplexed signal when a symbol period start position of the orthogonal frequency division multiplexed signal coincides with a symbol period start position of the near-end crosstalk signal. That is, the process indicated by 4000 in the figure is to synchronize the symbol period start position of the orthogonal frequency division multiplexed signal to the symbol period start position of the near-end crosstalk signal, due to the sign of the near-end crosstalk signal and the positive
  • the symbol length and the symbol period of the cross-frequency division multiplexed signal are the same, which can effectively ensure the synchronization between signals.
  • a method for realizing symbol synchronization is provided under the premise that all lines use the same symbol length, and the synchronization center is selected by the synchronization center manager to transmit a synchronous pilot signal, so that multiple transceivers are synchronously transmitted.
  • the frequency division multiplexed signal is provided under the premise that all lines use the same symbol length, and the synchronization center is selected by the synchronization center manager to transmit a synchronous pilot signal, so that multiple transceivers are synchronously transmitted.
  • FIG. 5 is a schematic diagram of a synchronization center management system in the embodiment.
  • the transceiver is described by taking a DSLAM as an example, including but not limited to a DSLAM.
  • FIG. 6 is a schematic diagram of the synchronization pilot signal transmission and relay in the synchronization center management system of the embodiment, as shown in the figure, including:
  • Step S1 when a DSLAM is started, the transceivers of all ports enter the state of detecting the NEXT signal.
  • Any transceiver that selects the DSLAM by the synchronization center manager issues a first synchronization pilot signal 5000 that is passed through the crosstalk channel to other transceivers in the group of transceivers.
  • the selection of the transceiver may be performed according to a preset rule, or may be randomly selected. Of course, the selected mode is not limited to the two modes described above.
  • the symbol period of the crosstalk signal caused by the first synchronization pilot signal 5000 is the same as the period of the symbol of the orthogonal frequency division multiplexing signal at the Initialization/Showtime phase.
  • Step S2 After the transceiver detects the first synchronization guiding signal, acquire a symbol period start position of the first synchronization guiding signal 5000, and then report the obtaining information 6000 to the synchronization center manager.
  • the acquisition information 6000 is used to indicate that the symbol period start position of the synchronization pilot signal has been acquired.
  • Step S3 After receiving the acquisition information 6000, the synchronization center manager performs statistical storage on the information, and starts timing. Within a predetermined time period T, such as a fixed signal period, the synchronization center manager selects a transceiver in the transceiver that does not report the detection information in the group, and the transceiver issues a second synchronization pilot signal 5000 that is identical to the first synchronization pilot signal.
  • the fixed signal period is an integer multiple of one signal period, for example: M signal periods T (M*T).
  • FIG. 7 is a schematic diagram of a state in which a synchronization center manager controls a transceiver in a synchronization center management system according to the embodiment, in which a white circle indicates that the acquisition information is not reported and a synchronization guidance signal is not sent, and a black circle indicates that the acquisition information has been reported or the synchronization guidance has been sent. signal.
  • a white circle indicates that the acquisition information is not reported and a synchronization guidance signal is not sent
  • a black circle indicates that the acquisition information has been reported or the synchronization guidance has been sent. signal.
  • FIG. 7a all transceivers do not report the acquisition information and do not send the synchronization pilot signal when the DLAM is started.
  • Figure 7b after the first synchronization transmission signal is sent, some transceivers have reported the acquisition information or sent.
  • the synchronization guiding signal as shown in FIG.
  • the new transceiver when the reporting acquisition message of the transceiver is not received within a predetermined time, the new transceiver is reselected to send the synchronization guiding signal, and the above steps are repeated, after the Nth synchronization guiding signal is sent.
  • Most transceivers have reported the acquisition information or sent the synchronization pilot signal.
  • FIG. 7d finally all the transceivers have reported the acquisition information or the synchronization guidance signal has been sent, that is, the symbol period of the synchronization pilot signal is not reported.
  • the set of transceivers at the start position and transmitting the synchronization pilot signal is empty.
  • FIG. 8 is a schematic diagram of symbol synchronization of the synchronous pilot signal relay scheme of any transceiver in the synchronization center management system according to the embodiment.
  • the transceiver when the transceiver first transmits a signal, the transceiver corresponds to The port records the symbol period start position 2000 of the transmission synchronization pilot signal, and in the active process, when the initialization phase is performed, the orthogonal frequency division is transmitted at the symbol period start position 2000 of the recorded synchronization pilot signal. Multiplexed signals.
  • the step is implemented by the transceiver, comprising: acquiring a symbol period start position 2000 of the recorded synchronization pilot signal, and then at the symbol period start position of the orthogonal frequency division multiplexed signal and the synchronization pilot signal Transmitting the orthogonal frequency division when the symbol period start position 2000 coincides The multiplexed signal, the process represented by 4000.
  • the periodic start position of the near-end crosstalk signal is detected by the transceiver in the initial stage of line activation, and symbol synchronization between the lines is realized.
  • the central manager directs and relays the synchronization pilot signal, and in the initialization phase of the line activation, the transceiver transmits the OFDM signal according to the symbol period start position of the synchronization pilot signal.
  • the problem of OFDM symbol synchronization is solved.
  • the performance of DSM is optimized to the best.
  • An embodiment of the present invention provides a system for implementing symbol synchronization, and the system can be used for a symbol synchronization system, which is used in a DSLAM, or a single DSLAM port.
  • a communication device can be included.
  • the communication device can be applied not only to the DSLAM but also to the wireless field, for example: WiFi, Wimax, including:
  • the transceiver 1 is configured to acquire a symbol period start position of the crosstalk signal, synchronize a symbol period start position of the pre-transmitted signal to a symbol period start position of the crosstalk signal, and follow a symbol period start position of the synchronized signal Send a signal.
  • the transceiver 1 (which may also be other systems that implement symbol synchronization) includes:
  • the first obtaining module 11 is configured to acquire a symbol period start position of the crosstalk signal
  • the synchronization module 12 is configured to synchronize a symbol period start position of the pre-transmitted signal to a symbol period of the crosstalk signal acquired by the first acquiring module 11 starting point;
  • the sending module 13 is configured to send a signal according to a symbol period start position of the signal synchronized by the synchronization module 12.
  • the method further includes:
  • the second obtaining module 14 is configured to obtain a symbol period start position of the near-end crosstalk signal. After acquiring the symbol period start position of the near-end crosstalk signal, the second obtaining module 14 sends the symbol period start position of the near-end crosstalk signal to the synchronization module 12.
  • the transceiver 1 When the transceiver 1 is based on the start position of the symbol period of the synchronous pilot signal, as shown in Figure 9, it also includes:
  • the receiving module 15 is configured to receive a sending synchronization guiding signal request sent by the synchronization center manager;
  • the synchronization guiding signal sending module 16 is configured to send the synchronization guiding signal after receiving the request by the receiving module 15;
  • the first acquisition module 11 acquires the symbol period start position of the crosstalk signal.
  • the reporting module 17 is configured to report the acquisition information when the first acquisition module 11 acquires the crosstalk caused by the synchronization guiding signal sent by the synchronization guiding signal sending module 16.
  • the system may further include a synchronization center manager 2, the synchronization center manager 2 including:
  • the selecting module 21 is configured to select a transceiver to send a synchronization guiding signal, and send a synchronous guiding signal request to the selected transceiver.
  • this request is received by the receiving module 15 in the transceiver.
  • the obtaining information statistics module 22 is configured to receive and collect the obtained information reported by the transceiver;
  • the timer 23 is configured to enable the selection module 21 to reselect the transceiver to send the synchronization guiding signal when the acquisition information statistics module 22 does not receive the acquisition information reported by the transceiver within a predetermined time.
  • the embodiment of the present invention has the following advantages: *: detecting a near-end crosstalk signal or a synchronous pilot signal in an initial stage of line activation by a transceiver, starting from a symbol period of a near-end crosstalk signal or a synchronous pilot signal
  • the position transmits signals to realize symbol synchronization between lines; solves the problem of symbol synchronization and ensures orthogonality during signal transmission.
  • modules in the device in the embodiment can follow The description of the embodiments is distributed in the apparatus of the embodiment, and the corresponding changes may also be made in one or more apparatuses different from the embodiment.
  • the modules of the above embodiments may be combined into one module, or may be further split into multiple sub-modules.
  • the present invention can be implemented by hardware, or can be implemented by means of software plus necessary general hardware platform, and the technical solution of the present invention.
  • Non-volatile storage medium which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.
  • a computer device may It is a personal computer, a server, or a network device, etc. that performs the methods described in various embodiments of the present invention.

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  • 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)

Abstract

L'invention concerne un procédé, un système et un dispositif mettant en œuvre une synchronisation de symboles. Le procédé comprend les étapes consistant à: obtenir la position de départ d'une période de symboles pour un signal de diaphonie (S301); synchroniser la position de départ de la période de symboles pour le signal à transmettre avec la position de départ de la période de symboles du signal de diaphonie (S302); transmettre le signal selon la position de départ synchronisée de la période de symboles. L'invention permet de mettre en œuvre une synchronisation de symboles dans des lignes respectives et d'assurer l'orthogonalité des symboles pendant la transmission du signal.
PCT/CN2009/071662 2008-05-19 2009-05-06 Procédé, système et dispositif mettant en œuvre une synchronisation de symboles WO2009140890A1 (fr)

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CN2008100979331A CN101588336B (zh) 2008-05-19 2008-05-19 一种实现符号同步的方法、系统及装置
CN200810097933.1 2008-05-19

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CN103765789B (zh) * 2013-09-18 2015-06-10 华为技术有限公司 一种线路初始化方法、装置和系统
CN111082913B (zh) 2017-03-15 2021-01-26 Oppo广东移动通信有限公司 传输信号的方法、终端设备和网络设备

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CN101060512A (zh) * 2006-06-30 2007-10-24 华为技术有限公司 一种ofdm传输符号同步的方法及其系统
CN101056296A (zh) * 2007-05-25 2007-10-17 东南大学 用于多径衰落信道环境下正交频分复用符号定时同步方法

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