WO2009076831A1 - 一种消除数字用户线串扰的方法、设备和系统 - Google Patents

一种消除数字用户线串扰的方法、设备和系统 Download PDF

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Publication number
WO2009076831A1
WO2009076831A1 PCT/CN2008/073207 CN2008073207W WO2009076831A1 WO 2009076831 A1 WO2009076831 A1 WO 2009076831A1 CN 2008073207 W CN2008073207 W CN 2008073207W WO 2009076831 A1 WO2009076831 A1 WO 2009076831A1
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Prior art keywords
signal
peer device
online
sent
unit
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Application number
PCT/CN2008/073207
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English (en)
French (fr)
Inventor
Liming Fang
Original Assignee
Huawei Technologies Co., Ltd.
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Publication date
Application filed by Huawei Technologies Co., Ltd. filed Critical Huawei Technologies Co., Ltd.
Priority to EP08862670A priority Critical patent/EP2107692B1/en
Priority to AT08862670T priority patent/ATE550836T1/de
Priority to ES08862670T priority patent/ES2383573T3/es
Publication of WO2009076831A1 publication Critical patent/WO2009076831A1/zh
Priority to US12/539,772 priority patent/US8045446B2/en

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B3/00—Line transmission systems
    • H04B3/02—Details
    • H04B3/32—Reducing cross-talk, e.g. by compensating
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M11/00—Telephonic communication systems specially adapted for combination with other electrical systems
    • H04M11/06—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors
    • H04M11/062—Simultaneous speech and data transmission, e.g. telegraphic transmission over the same conductors using different frequency bands for speech and other data
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/28—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor
    • H04M3/30—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop
    • H04M3/302—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs
    • H04M3/304—Automatic routine testing ; Fault testing; Installation testing; Test methods, test equipment or test arrangements therefor for subscriber's lines, for the local loop using modulation techniques for copper pairs and using xDSL modems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/22—Arrangements for supervision, monitoring or testing
    • H04M3/26—Arrangements for supervision, monitoring or testing with means for applying test signals or for measuring
    • H04M3/34—Testing for cross-talk

Definitions

  • This invention relates to the field of network communications and, in particular, to a method, apparatus and system for eliminating crosstalk of digital subscriber lines.
  • Digital Subscriber Line is a data transmission technology that uses telephone twisted pair as a transmission medium.
  • the X Digital Subscriber Line is a combination of this transmission technology, including High Speed Digital Subscriber Line (HDSL), Single Pair High Speed Digital Subscriber Line (SHDSL), Asymmetric Digital Subscriber Line (ADSL), and the like.
  • HDSL High Speed Digital Subscriber Line
  • SHDSL Single Pair High Speed Digital Subscriber Line
  • ADSL Asymmetric Digital Subscriber Line
  • POTS traditional telephone service
  • JC is a signal vector sent by Nxl's joint transceiver device (which can be a digital subscriber line access multiplexer DSLAM); it is a signal vector received by the Nxl peer device (which can be a user-side device), ⁇ 1 noise vector.
  • the shared channel is represented by a channel transmission matrix as
  • h v (1 ⁇ ⁇ N, 1 ⁇ _/ ⁇ ⁇ N) represents the crosstalk transfer function of line pair j versus line pair i
  • (1 ⁇ ⁇ N) represents the channel transfer function of line pair i
  • N is the line logarithm, That is, the number of users.
  • H is a diagonal matrix, such as dia g (H, , crosstalk can be eliminated.
  • the vector precoder on the joint transceiver side can be expressed as
  • the diagonal elements are all 1.
  • the Nth peer device goes online, there are two steps, that is, the line basically starts up and joins the vector group. Before these two steps occur, the Nth peer device will crosstalk the N-1 peer devices that have gone online, and even cause the individual lines to drop. Therefore, it is required that the Nth peer device does not cause crosstalk beyond the tolerance of the N-1 peer devices, and the shorter the process, the better.
  • the vector precoder is
  • the W N ratio is increased by one row and one column of vectors, and the added column vector is used to cancel the crosstalk of the Nth peer device to the N-1 peer devices that have gone online. Therefore, in order to quickly reduce the crosstalk of the Nth peer device to the already-on Ni peer devices, the Ni-dimensional column vector must be calculated in a short time.
  • the peer device needs to return a large amount of data to the joint transceiver device.
  • the feedback channel capacity of the peer device to the joint transceiver device is very limited, and thus the calculation time for the new column vector is long.
  • the technical problem to be solved by the embodiments of the present invention is: Providing a method, device and system for eliminating crosstalk of digital subscriber lines, and overcoming the existing digital subscriber line crosstalk cancellation technology to eliminate crosstalk of a new uplink peer device to an online peer device The disadvantage of taking a long time.
  • the embodiment of the invention provides a method for eliminating crosstalk of digital subscriber lines, including:
  • the joint transceiver device notifies the peer device sent to the new online device to the peer device that has gone online;
  • the joint transceiver device receives a calculation result, and the calculation result is calculated by the online peer device based on the detected error signal and the signal sent to the new peer device; the joint transceiver device is based on The calculation results update the coefficients of the vector precoder.
  • the embodiment of the invention further provides a digital subscriber line-to-peer device, including: a learning unit, configured to learn a signal sent by the joint transceiver device to the new peer device, and a detecting unit, configured to detect the error signal;
  • a calculating unit configured to calculate, according to the detected error signal and the learned signal sent to the new uplink device
  • a feedback unit configured to feed back the calculation result calculated by the calculation unit to the joint transceiver device.
  • An embodiment of the present invention provides a digital subscriber line joint transceiver device, including:
  • a notification unit configured to notify a peer device that is sent to the new online device to the online device that is online;
  • a receiving unit configured to receive a calculation result of the online peer device feedback, where the calculation result is determined by the online peer device based on the detected error signal and the signal sent to the new peer device Calculated;
  • Embodiments of the present invention provide a system for eliminating crosstalk of digital subscriber lines, including a peer device and a joint transceiver device, where:
  • the peer device includes: a learning unit, configured to learn a signal sent by the joint transceiver device to a new peer device; a detecting unit, configured to detect an error signal; and a calculating unit, configured to use the detected error signal and the device
  • the learned signal sent to the new peer device is calculated; the feedback unit is configured to feed back the calculation result of the computing unit to the joint transceiver device;
  • the joint transceiver device includes: a notification unit, configured to notify a peer device that is sent to the new online device to the online peer device; and a receiving unit, configured to receive the calculation result of the online peer device feedback And an updating unit, configured to update a coefficient of the vector precoder based on the calculation result.
  • the present invention provides a method, device, and system for eliminating crosstalk of a digital subscriber line.
  • the data transmitted back to the joint transceiver device is greatly reduced.
  • the amount can significantly reduce the time for the new peer-to-peer device to crosstalk to the peer device, and greatly increase the speed at which the new peer device joins the vector group.
  • 1 is a schematic diagram of a vectored-DSL technology for solving xDSL crosstalk in the prior art
  • 2 is a schematic diagram of a method for eliminating crosstalk of a digital subscriber line according to an embodiment of the present invention
  • FIG. 3 is a schematic diagram of a system for eliminating crosstalk of a digital subscriber line according to Embodiment 2 of the present invention.
  • FIG. 4 is a schematic structural diagram of a receiving unit of a peer device of a system for eliminating digital subscriber line crosstalk according to Embodiment 2 of the present invention
  • FIG. 5 is a schematic structural diagram of a transmitting unit of a joint transceiver device of a system for eliminating digital subscriber line crosstalk according to Embodiment 2 of the present invention.
  • FIG. 2 is a schematic diagram of a method for eliminating crosstalk of digital subscriber lines according to an embodiment of the present invention.
  • the specific steps of eliminating digital subscriber line crosstalk in this embodiment are as follows:
  • Step 101 The joint transceiver device notifies the peer device that is sent to the new online device to the peer device that has gone online;
  • the joint transceiver device notifies the peer device that is sent to the new uplink to the peer device that is online.
  • the sequencer with the same structure can be set on the joint transceiver device and the peer device. Sending the initial value of the sequencer for generating the signal of the peer device sent to the new uplink and the time of transmitting the signal to the new peer device, so that the joint transceiver uses the sequence.
  • the peer device that has been online can know that the joint transceiver sends the new signal according to the set sequence generator, the initial value of the received sequencer, and the time when the signal is sent. The signal of the peer device on the line.
  • the joint transceiver device notifies the signal sent to the new peer device to the peer-end sequence, and the joint transceiver device only needs to identify and sequence the sequence of the signal used to generate the peer device sent to the new uplink.
  • the time when the new online peer device sends a signal is sent to the peer device that has been online, so that when the joint transceiver device uses the sequence of signals to send to the new peer device, the online peer device can be pre-stored according to the pre-stored device.
  • the signal sequence, the identification of the received signal sequence, and the timing of the transmitted signal are informed of the signal sent by the joint transceiver device to the new peer device.
  • Step 102 The peer device that has gone online performs calculation according to the detected error signal and the learned signal sent to the new peer device, and feeds back the calculation result to the joint transceiver device;
  • the error signal detected by the peer device that has been online can be received by the peer device that has gone online.
  • the received sample is judged, and the judgment sample is obtained, and the difference between the received sample and the judgment sample is obtained.
  • the peer device that has been online can calculate according to the detected error signal and the learned signal sent to the new peer device, which can be performed according to the following formula: Assuming that N-1 peer devices are online, /(1 ⁇ / ⁇ (N-1)) represents any one of the N-1 peer devices that have gone online.
  • M is a certain accumulation time, which is the signal sent by the joint transceiver device to the new peer device, and ( «) indicates the conjugate of ( «).
  • the peer device that has gone online will multiply the conjugate of the signal sent to the new peer device and the detected error signal, and accumulate a certain time to obtain a calculation result.
  • the peer device that has been online is calculated according to the detected error signal and the learned signal sent to the new peer device, and can also be performed according to the following formula: An adaptive step factor.
  • the peer-to-peer device multiplies the conjugate of the signal sent to the new peer-to-peer device by the detected error signal and the adaptive step factor, and accumulates a certain time to obtain a calculation result.
  • the peer/online peer device feeds the calculation result to the joint transceiver device.
  • Step 103 The joint transceiver device updates the coefficients of the vector precoder according to the calculation result of the feedback of the peer device that has gone online.
  • ⁇ (wew) is the updated N to offset the new uplink.
  • the joint transceiver device reduces the coefficient of the vector precoder for canceling the crosstalk of the newly uplinked peer device to the peer device that has gone online, and the amount of reduction is the calculation result of the feedback.
  • the method for eliminating crosstalk of the digital subscriber line provided in this embodiment can greatly reduce the amount of data returned to the joint transceiver device by performing calculation on the peer device, and can significantly reduce the elimination of the new uplink peer device to the online peer device.
  • the time of crosstalk greatly increases the speed at which the new peer device joins the vector group.
  • FIG. 3 is a schematic diagram of a system for eliminating crosstalk of a digital subscriber line according to Embodiment 2 of the present invention.
  • the system includes at least a peer device 1 and a joint transceiver device 2.
  • the peer device 1 includes a learning unit 11, a detecting unit 12, a calculating unit 13, and a feedback unit 14.
  • the learning unit 11 is configured to learn a signal sent by the joint transceiver device to the new peer device
  • the detecting unit 12 is configured to detect the error signal.
  • the calculating unit 13 is configured to send the signal to the new uplink based on the detected error signal and the learned signal.
  • the signal of the peer device is calculated; the feedback unit 14 is configured to feed back the calculation result of the calculation unit to the joint transceiver device.
  • the joint transceiver device 2 includes a notifying unit 21, a receiving unit 22, and an updating unit 23.
  • the notification unit 21 is configured to notify the peer device that is sent to the new online device to the peer device that has gone online;
  • the receiving unit 22 is configured to receive the calculation result of the feedback of the peer device that has gone online;
  • the updating unit 23 is configured to: The coefficients of the vector precoder are updated based on the feedback calculation results.
  • FIG. 4 is a schematic structural diagram of a receiving unit of a peer device according to the embodiment.
  • the learning unit 11 of the peer device may further include a storage unit 111, a sequence receiving unit 112, and a signal generating unit 113.
  • the storage unit 111 is configured to store a sequence generator or a certain number of signal sequences.
  • the sequence receiving unit 112 is configured to receive, when the storage unit stores the sequence generator, a peer device sent by the joint transceiver device for generating a new uplink.
  • the storage unit when the storage unit stores a certain number of signal sequences, generates a signal sent by the joint transceiver device to the new peer device according to the stored signal sequence, the identifier of the signal sequence, and the time when the signal is sent.
  • FIG. 5 is a schematic structural diagram of a sending unit of a joint transceiver device according to the embodiment.
  • the notification unit 21 of the joint transceiver device may further include a storage unit 211 and a sequence transmission unit 212.
  • the storage unit 211 is configured to store a sequence generator or a certain number of signal sequences.
  • the sequence sending unit 212 is configured to: when the storage unit stores the sequence generator, send a sequence for generating a signal sent to the peer device of the new uplink. The initial value of the device and the time when the signal is sent to the peer device that has been online; when the storage unit stores a certain number of signal sequences, the identification and transmission of the signal sequence for generating the signal for the peer device sent to the new uplink is sent. The moment of the signal to the peer device that has been online.
  • the system and device for eliminating digital subscriber line crosstalk provided by this embodiment can greatly reduce the amount of data that is transmitted back to the joint transceiver device by performing calculation on the peer device, and can significantly reduce the pair of new online peer devices.
  • the cross-talk time of the end device greatly increases the speed at which the new peer device joins the vector group.
  • the above-mentioned storage medium may be a read only memory, a magnetic disk or an optical disk or the like.

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  • Computer Networks & Wireless Communication (AREA)
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Description

一种消除数字用户线串扰的方法、 设备和系统
本申请要求于 2007 年 11 月 29 日提交中国专利局、 申请号为 200710077480.1、 发明名称为"一种消除数字用户线串扰的方法、 设备和系统" 的中国专利申请的优先权， 其全部内容通过引用结合在本申请中。
技术领域
本发明涉及网络通信领域， 具体地说， 涉及一种消除数字用户线串扰的方 法、 设备和系统。
背景技术
数字用户线 （DSL )是一种以电话双绞线为传输介质的数据传输技术。 X 数字用户线（xDSL )作为该传输技术的组合， 包括高速数字用户线（HDSL )、 单线对高速数字用户线（SHDSL )、 非对称数字用户线（ADSL )等等。 其中， 除利用基带传输的 SHDSL等之外， 釆用通带传输的其它 xDSL利用频分复用 技术， 与传统电话业务（POTS )可共存于同一对双绞线上。
随着通带传输的 xDSL使用的频带越来越高， 高频段的串扰（ Crosstalk ) 问题也表现得尤为突出。 现有技术提供一种向量数字用户线（ vectored-DSL ) 技术解决 xDSL串扰问题， 如图 1所示。 在下行方向上， JC是 Nxl的联合收发 设备（可以为数字用户线接入复用器 DSLAM )发送的信号向量， ；是 Nxl的 对端设备（可以为用户侧设备）接收的信号向量， 《是^ 1的噪声向量。 共享 信道用信道传输矩阵表示为
Figure imgf000003_0001
Κ 〃 h22 · · · h
H =
Figure imgf000003_0002
hv (1≤ ≤ N, 1≤ _/·≤ N)表示线对 j对线对 i的串扰传递函数， (1≤ ≤ N)表示线对 i 的信道传递函数， N为线对数， 即用户数。 通过在联合收发设备侧引入一个用 表示的向量预编码器， 则对端设备接收的信号向量为
y = HWx + n
若向量预编码器能使 H 为一对角矩阵， 如 diag(H、 , 则可消除串扰。
假设其中 N- 1个对端设备已经上线工作并进入良好的串扰抵消状态，其联 合收发设备侧的向量预编码器可以表示为
Figure imgf000004_0001
如果釆用一阶滤波结构， 其对角线元素均为 1。 当第 N个对端设备上线时有两 个步骤， 即线路基本启动和加入向量组（vector group )。 在这两个步骤发生前， 第 N个对端设备会对已上线的 N-1个对端设备产生串扰，甚至导致个别线路掉 线。 因此，要求在第 N个对端设备上线时不会导致超过 N-1个对端设备所能容 忍的串扰， 且这个过程越短越好。 此时， 向量预编码器为
wn · .. w rr \,N-\ w yr \,N
w22 · · · w r' 2,N-\ w yr 2,N w r' N-\,\ w r' N-\,2 · .. W r' N-\,N-\ w r' N-\,N
w w · .. W r' N,N-\ w r' N,N
WN比 多增加了一行和一列向量， 增加的列向量是为了抵消第 N个对端设 备对已上线的 N-1个对端设备的串扰。 因此， 为了迅速降低第 N个对端设备对 已上线的 N-i个对端设备的串扰，必须要在很短的时间内计算出这个 N-i维的 列向量。 现有技术中对端设备需要回传大量数据至联合收发设备， 然而， 对端 设备至联合收发设备的反馈信道容量非常有限，因而对新增列向量的计算时间 较长。
发明内容
本发明实施例要解决的技术问题是： 提供一种消除数字用户线串扰的方 法、 设备和系统,克服现有的数字用户线串扰消除技术在消除新上线对端设备 对已上线对端设备串扰时耗时较长的缺点。
本发明实施例提供了一种消除数字用户线串扰的方法， 包括：
联合收发设备将发送至新上线的对端设备的信号通知至已上线的对端设 备；
所述联合收发设备接收计算结果，所述计算结果由所述已上线的对端设备 基于检测的误差信号和所述发送至新上线的对端设备的信号进行计算得到； 所述联合收发设备基于所述计算结果对向量预编码器的系数进行更新。 本发明实施例还提供了一种数字用户线对端设备， 包括： 获知单元， 用于获知联合收发设备发送至新上线的对端设备的信号； 检测单元， 用于检测误差信号；
计算单元，用于基于所述检测的误差信号和所述获知的发送至新上线的对 端设备的信号进行计算；
反馈单元，用于反馈所述计算单元进行计算得到的计算结果至所述联合收 发设备。
本发明实施例提供了一种数字用户线联合收发设备， 包括：
通知单元，用于将发送至新上线的对端设备的信号通知至已上线的对端设 备；
接收单元， 用于接收所述已上线的对端设备反馈的计算结果， 所述计算结 果由所述已上线的对端设备基于检测的误差信号和所述发送至新上线的对端 设备的信号进行计算得到；
更新单元， 用于基于所述计算结果对向量预编码器的系数进行更新。 本发明实施例提供了一种消除数字用户线串扰的系统，包括对端设备和联 合收发设备， 其中：
所述对端设备包括： 获知单元， 用于获知联合收发设备发送至新上线的对 端设备的信号； 检测单元， 用于检测误差信号； 计算单元， 用于基于所述检测 的误差信号和所述获知的发送至新上线的对端设备的信号进行计算； 反馈单 元， 用于反馈所述计算单元的计算结果至所述联合收发设备；
所述联合收发设备包括： 通知单元， 用于将发送至新上线的对端设备的信 号通知至已上线的对端设备； 接收单元， 用于接收所述已上线的对端设备反馈 的计算结果； 更新单元， 用于基于所述计算结果对向量预编码器的系数进行更 新。
由上述本发明实施例提供的技术方案可以看出，本发明提供一种消除数字 用户线串扰的方法、 设备和系统,通过在对端设备进行计算， 大大降低了回传 给联合收发设备的数据量， 能显著地降低消除新上线对端设备对已上线对端 设备串扰的时间， 大大提升新对端设备加入向量组的速度。
附图说明
图 1为现有技术中 vectored-DSL技术解决 xDSL串扰的示意图； 图 2为本发明实施例一消除数字用户线串扰的方法示意图；
图 3为本发明实施例二消除数字用户线串扰的系统示意图；
图 4 为本发明实施例二消除数字用户线串扰的系统的对端设备的接收单 元的结构示意图；
图 5 为本发明实施例二消除数字用户线串扰的系统的联合收发设备的发 送单元的结构示意图。
具体实施方式
如图 2所示为本发明实施例一消除数字用户线串扰的方法示意图。 本实施 例消除数字用户线串扰的具体步骤如下：
步骤 101 : 联合收发设备将发送至新上线的对端设备的信号通知至已上线 的对端设备；
联合收发设备将发送至新上线的对端设备的信号通知至已上线的对端设 备， 可以通过在联合收发设备端和对端设备端设置具有相同结构的序列发生 器，联合收发设备只需要预先将用于生成发送至新上线的对端设备的信号的序 列发生器的初始值和向新上线的对端设备发送信号的时刻发送给已上线的对 端设备，这样当联合收发设备使用这个序列发生器产生的信号发送给新上线的 对端设备时， 已上线的对端设备就能根据设置的序列发生器、接收的序列发生 器的初始值和发送信号的时刻获知联合收发设备发送至新上线的对端设备的 信号。
联合收发设备将发送至新上线的对端设备的信号通知至已上线的对端设 序列，联合收发设备只需要预先将用于生成发送至新上线的对端设备的信号的 序列的标识和向新上线的对端设备发送信号的时刻发送给已上线的对端设备， 这样当联合收发设备使用该序列的信号发送给新上线的对端设备时，已上线的 对端设备就能根据预先存储的信号序列、接收的信号序列的标识和发送信号的 时刻获知联合收发设备发送至新上线的对端设备的信号
步骤 102: 已上线的对端设备根据检测的误差信号和获知的发送至新上线 的对端设备的信号进行计算， 反馈计算结果至联合收发设备；
已上线的对端设备检测的误差信号，可以通过对已上线的对端设备接收到 的接收样本进行判决， 得到判决样本， 取接收样本和判决样本之差得到。 已上线的对端设备根据检测的误差信号和获知的发送至新上线的对端设 备的信号进行计算， 可以按照如下公式进行：
Figure imgf000007_0001
假设已有 N - 1个对端设备上线，则 /(1≤/≤(N-1))表示 N- 1个已上线的对端设备中 的任何一个。 M是一定的累积时间， 是联合收发设备发送至新上线的对端 设备的信号， («)表示 («)的共轭。 是当联合收发设备发送 («)至新上线 的对端设备时， 第 /个已上线的对端设备检测的误差信号。 已上线的对端设备 将获知的发送至新上线的对端设备的信号的共轭与检测的误差信号相乘，并累 积一定的时间， 得到计算结果。
已上线的对端设备根据检测的误差信号和获知的发送至新上线的对端设 备的信号进行计算， 还可以按照如下公式进行：
Figure imgf000007_0002
为自适应的步长因子。 已上线的对端设备将获知的发送至新上线的对端设备 的信号的共轭与检测的误差信号及自适应步长因子相乘， 并累积一定的时间， 得到计算结果。
第 /个已上线的对端设备把计算结果；反馈给联合收发设备。
步骤 103 : 联合收发设备根据已上线的对端设备反馈的计算结果对向量预 编码器的系数进行更新。
当已上线的对端设备反馈的计算结果是根据公式 = |];Τ 计算时， 联合收发设备根据如下公式对向量预编码器的系数进行 £¾斤：
Wi N (new) = Wi N (old) - μτ{
是更新前的为了抵消新上线的第 N个对端设备对已上线的第 /个对端 设备的串扰的向量预编码器系数， ^^(wew)是更新后的为了抵消新上线的第 N 个对端设备对已上线的第 /个对端设备的串扰的向量预编码器系数。 联合收发 量预编 当已上线的对端设备反馈的计算结果是根据公式 ζ = /| ;Τ 计算 时， 联合收发设备根据如下公式对向量预编码器的系数进行更新：
Wi N (new) = Wi N (old) - ri
联合收发设备减小用于抵消新上线的对端设备对已上线的对端设备的串 扰的向量预编码器的系数， 减小量为反馈的计算结果。
本实施例提供的消除数字用户线串扰的方法,通过在对端设备进行计算， 大大降低了回传给联合收发设备的数据量，能显著地降低消除新上线对端设备 对已上线对端设备串扰的时间， 大大提升新对端设备加入向量组的速度。
如图 3所示为本发明实施例二消除数字用户线串扰的系统示意图， 该系统 至少包括对端设备 1和联合收发设备 2。
其中， 对端设备 1包括获知单元 11 , 检测单元 12, 计算单元 13和反馈单 元 14。 获知单元 11 , 用于获知联合收发设备发送至新上线的对端设备的信号； 检测单元 12, 用于检测误差信号； 计算单元 13 , 用于基于检测的误差信号和 获知的发送至新上线的对端设备的信号进行计算； 反馈单元 14 , 用于反馈计 算单元的计算结果至联合收发设备。
相应地，联合收发设备 2包括：通知单元 21 ,接收单元 22和更新单元 23。 通知单元 21 , 用于将发送至新上线的对端设备的信号通知至已上线的对端设 备； 接收单元 22, 用于接收已上线的对端设备反馈的计算结果； 更新单元 23 , 用于基于反馈的计算结果对向量预编码器的系数进行更新。
如图 4所示为本实施例对端设备的接收单元的结构示意图。对端设备的获 知单元 11 可以进一步包括存储单元 111、 序列接收单元 112和信号生成单元 113。 存储单元 111 , 用于存储序列发生器或一定数目的信号序列； 序列接收 单元 112, 用于当存储单元存储序列发生器时， 接收联合收发设备发送的用于 产生发送至新上线的对端设备的信号的序列发生器的初始值和发送该信号的 时刻； 当存储单元存储一定数目的信号序列时，接收联合收发设备发送的用于 产生发送至新上线的对端设备的信号的信号序列的标识和发送该信号的时刻； 信号生成单元 113 , 用于当存储单元存储序列发生器时， 根据设置的序列发生 器、序列发生器的初始值和发送信号的时刻生成联合收发设备发送至新上线的 对端设备的信号； 当存储单元存储一定数目的信号序列时，根据存储的信号序 列、信号序列的标识和发送信号的时刻生成联合收发设备发送至新上线的对端 设备的信号。
如图 5所示为本实施例联合收发设备的发送单元的结构示意图。联合收发 设备的通知单元 21 可以进一步包括存储单元 211和序列发送单元 212。 存储 单元 211 , 用于存储序列发生器或一定数目的信号序列； 序列发送单元 212, 用于当存储单元存储序列发生器时，发送用于产生发送至新上线的对端设备的 信号的序列发生器的初始值和发送该信号的时刻至已上线的对端设备；当存储 单元存储一定数目的信号序列时，发送用于产生发送至新上线的对端设备的信 号的信号序列的标识和发送该信号的时刻至已上线的对端设备。
本实施例提供的消除数字用户线串扰的系统和设备,通过在对端设备进行 计算， 大大降低了回传给联合收发设备的数据量， 能显著地降低消除新上线 对端设备对已上线对端设备串扰的时间， 大大提升新对端设备加入向量组 的速度。
本领域普通技术人员可以理解实现上述实施例方法中的全部或部分步骤 是可以通过程序来指令相关的硬件完成，所述的程序可以存储于一种计算机可 读存储介质中， 该程序在执行时，执行本发明实施例提供的上述方法实施例的 部分或全部步骤。
上述提到的存储介质可以是只读存储器， 磁盘或光盘等。
以上所述，仅为本发明较佳的具体实施方式，但本发明的保护范围并不局 限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内， 可轻易 想到的变化或替换， 都应涵盖在本发明的保护范围之内。 因此， 本发明的保护 范围应该以权利要求的保护范围为准。

Claims

权 利 要 求
1、 一种消除数字用户线串扰的方法， 其特征在于， 包括：
联合收发设备将发送至新上线的对端设备的信号通知至已上线的对端设 备；
所述联合收发设备接收计算结果，所述计算结果由所述已上线的对端设备 基于检测的误差信号和所述发送至新上线的对端设备的信号进行计算得到； 所述联合收发设备基于所述计算结果对向量预编码器的系数进行更新。
2、 如权利要求 1所述的消除数字用户线串扰的方法， 其特征在于， 所述 联合收发设备将发送至新上线的对端设备的信号通知至已上线的对端设备，具 体包括：
所述联合收发设备将产生所述信号的序列发生器的初始值和发送所述信 号的时刻发送至所述已上线的对端设备，所述联合收发设备和所述已上线的对 端设备中设置具有相同结构的序列发生器；
所述已上线的对端设备根据所述设置的序列发生器、所述序列发生器的初 始值和所述发送信号的时刻获知所述信号。
3、 如权利要求 1所述的消除数字用户线串扰的方法， 其特征在于， 所述 联合收发设备将发送至新上线的对端设备的信号通知至已上线的对端设备，具 体包括：
所述联合收发设备将产生所述信号的信号序列的标识和发送所述信号的 时刻发送至所述已上线的对端设备，所述联合收发设备和所述对端设备中存储 一定数目的相同信号序列；
所述已上线的对端设备根据所述存储的信号序列、所述信号序列的标识和 所述发送信号的时刻获知所述信号。
4、 如权利要求 1任一所述的消除数字用户线串扰的方法， 其特征在于， 所述基于检测的误差信号和所述发送至新上线的对端设备的信号进行计算，具 体包括： 将所述发送至新上线的对端设备的信号的共轭与所述误差信号相乘， 并累积一定的时间。
5、 如权利要求 4所述的消除数字用户线串扰的方法， 其特征在于， 所述 向量预编码器的系数为用于抵消新上线的对端设备对已上线的对端设备的串 扰的向量预编码器的系数，所述联合收发设备基于所述计算结果对向量预编码 器的系数进行更新， 具体包括： 所述联合收发设备减小所述用于抵消新上线的 对端设备对已上线的对端设备的串扰的向量预编码器的系数，减小量为所述计 算结果与自适应步长因子的乘积。
6、 如权利要求 1任一所述的消除数字用户线串扰的方法， 其特征在于， 所述基于检测的误差信号和所述发送至新上线的对端设备的信号进行计算，具 体包括：将所述发送至新上线的对端设备的信号的共轭与所述误差信号及自适 应步长因子相乘， 并累积一定的时间。
7、 一种数字用户线对端设备， 其特征在于， 包括：
获知单元， 用于获知联合收发设备发送至新上线的对端设备的信号； 检测单元， 用于检测误差信号；
计算单元，用于基于所述检测的误差信号和所述获知的发送至新上线的对 端设备的信号进行计算；
反馈单元，用于反馈所述计算单元进行计算得到的计算结果至所述联合收 发设备。
8、 如权利要求 7所述的数字用户线对端设备， 其特征在于， 所述获知单 元包括：
存储单元， 用于存储序列发生器； 上线的对端设备的信号的所述序列发生器的初始值和所述发送信号的时刻； 信号生成单元， 用于根据所述设置的序列发生器、 所述序列发生器的初始 值和所述发送信号的时刻生成所述联合收发设备发送至新上线的对端设备的 信号。
9、 如权利要求 7所述的数字用户线对端设备， 奇特正在于， 所述获知单 元包括：
存储单元， 用于存储一定数目的信号序列； 上线的对端设备的信号的信号序列的标识和发送所述信号的时刻；
信号生成单元， 用于根据所述存储的信号序列、所述信号序列的标识和所 述发送信号的时刻生成所述联合收发设备发送至新上线的对端设备的信号。
10、 一种数字用户线联合收发设备， 其特征在于， 包括：
通知单元，用于将发送至新上线的对端设备的信号通知至已上线的对端设 备；
接收单元， 用于接收所述已上线的对端设备反馈的计算结果， 所述计算结 果由所述已上线的对端设备基于检测的误差信号和所述发送至新上线的对端 设备的信号进行计算得到；
更新单元， 用于基于所述计算结果对向量预编码器的系数进行更新。
11、 如权利要求 10所述的数字用户线联合收发设备， 其特征在于， 所述 通知单元包括：
存储单元， 用于存储序列发生器；
序列发送单元，用于发送用于产生所述信号的所述序列发生器的初始值和 所述发送信号的时刻至所述已上线的对端设备。
12、 如权利要求 10所述的数字用户线联合收发设备， 其特征在于， 所述 通知单元包括：
存储单元， 用于存储一定数目的信号序列；
序列发送单元，用于发送用于产生所述信号的信号序列的标识和发送所述 信号的时刻至所述已上线的对端设备。
13、 一种消除数字用户线串扰的系统， 包括对端设备和联合收发设备， 其 特征在于：
所述对端设备包括： 获知单元， 用于获知联合收发设备发送至新上线的对 端设备的信号； 检测单元， 用于检测误差信号； 计算单元， 用于基于所述检测 的误差信号和所述获知的发送至新上线的对端设备的信号进行计算； 反馈单 元， 用于反馈所述计算单元的计算结果至所述联合收发设备；
所述联合收发设备包括： 通知单元， 用于将发送至新上线的对端设备的信 号通知至已上线的对端设备； 接收单元， 用于接收所述已上线的对端设备反馈 的计算结果； 更新单元， 用于基于所述计算结果对向量预编码器的系数进行更 新。
14、 如权利要求 13所述的消除数字用户线串扰的系统， 其特征在于， 所 述对端设备的获知单元包括：
存储单元， 用于存储序列发生器；
序列接收单元，用于接收所述联合收发设备发送的用于产生所述信号的所 述序列发生器的初始值和所述发送信号的时刻；
信号生成单元， 用于根据所述设置的序列发生器、 所述序列发生器的初始 值和所述发送信号的时刻生成所述联合收发设备发送至新上线的对端设备的 信号。
15、如权利要求 13所述的一种消除数字用户线串扰的系统， 其特征在于， 所述对端设备的获知单元包括：
存储单元， 用于存储一定数目的信号序列；
序列接收单元，用于接收所述联合收发设备发送的用于产生所述信号的信 号序列的标识和发送所述信号的时刻；
信号生成单元， 用于根据所述存储的信号序列、所述信号序列的标识和所 述发送信号的时刻生成所述联合收发设备发送至新上线的对端设备的信号。
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ATE550836T1 (de) 2012-04-15
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