公开(公告)号：US20090268601A1

公开(公告)日：2009-10-29

申请号：US12433287

申请日：2009-04-30

申请人： Liming Fang ,  Lihe Liu

发明人： Liming Fang ,  Lihe Liu

IPC分类号： H04J1/12

CPC分类号： H04B3/32

摘要： A method and apparatus for spectrum management in an xDSL system are disclosed. The method mainly include: determining a transmit PSD mask according to a crosstalk status of a line; performing IWF operation using the transmit PSD mask; and dynamically managing line spectrum according to the result of the IWF operation. Therefore, various embodiments of the present invention allow the DSLAM performance to approximate the OSM performance without the need for a center controller and with a rather simple algorithm in a severe crosstalk scenario. Moreover, the embodiments of the present invention may help to simply the design of DSLAM optimization system and achieve a proper balance between the DSLAM performance and the complexity.

摘要翻译： 公开了一种在xDSL系统中进行频谱管理的方法和装置。 该方法主要包括：根据线路的串扰状态确定发射PSD掩码; 使用发送PSD掩码执行IWF操作; 并根据IWF操作的结果动态管理线路频谱。 因此，本发明的各种实施例允许DSLAM性能近似OSM性能，而不需要中央控制器，并且在严格的串扰情况下使用相当简单的算法。 此外，本发明的实施例可以帮助简单地设计DSLAM优化系统，并且在DSLAM性能和复杂性之间实现适当的平衡。

公开(公告)号：US08320526B2

公开(公告)日：2012-11-27

申请号：US12857045

申请日：2010-08-16

申请人： Raphael Cendrillon ,  Liming Fang ,  Lihe Liu

发明人： Raphael Cendrillon ,  Liming Fang ,  Lihe Liu

IPC分类号： H04M1/24 ,  H04M3/08 ,  H04M3/22

CPC分类号： H04L5/14 ,  H04B3/32 ,  H04L5/0007 ,  H04L5/0046

摘要： The embodiments of the present invention disclose a spectrum optimization method and device and digital subscriber line system, the method comprising: calculating according to acquired information of each of respective subcarriers on the DSL line to be optimized to obtain optimized transmission power of a subcarrier to be optimized in a DSL line to be optimized; calculating a transmission rate of the DSL line to be optimized according to the optimized transmission power; and comparing the transmission rate with a target rate of the DSL line to be optimized, and if the transmission rate is less than the target rate, updating the information of an optimized subcarrier, and performing a recalculation. The embodiments of the present invention can overcome the problem of the conventional art that it is difficult to converge the rate weighted coefficient, and improve the rate of a given subscriber line while reduce power loss caused by the given subscriber line to other subscriber lines in the same bundle of cables.

摘要翻译： 本发明的实施例公开了一种频谱优化方法和装置和数字用户线系统，该方法包括：根据要优化的DSL线上每个子载波的获取信息进行计算，以获得子载波的优化发射功率 优化在DSL线路上进行优化; 根据优化的传输功率计算要优化的DSL线路的传输速率; 将传输速率与要优化的DSL线路的目标速率进行比较，如果传输速率小于目标速率，则更新优化的副载波的信息，并执行重新计算。 本发明的实施例可以克服传统技术难以收敛速率加权系数的问题，并提高给定用户线路的速率，同时减少给定用户线路对其他用户线路造成的功率损耗 同一捆电缆。

公开(公告)号：US08000219B2

公开(公告)日：2011-08-16

申请号：US12433287

申请日：2009-04-30

申请人： Liming Fang ,  Lihe Liu

发明人： Liming Fang ,  Lihe Liu

IPC分类号： H04J1/12

CPC分类号： H04B3/32

摘要： A method and apparatus for spectrum management in an xDSL system are disclosed. The method mainly include: determining a transmit PSD mask according to a crosstalk status of a line; performing IWF operation using the transmit PSD mask; and dynamically managing line spectrum according to the result of the IWF operation. Therefore, various embodiments of the present invention allow the DSLAM performance to approximate the OSM performance without the need for a center controller and with a rather simple algorithm in a severe crosstalk scenario. Moreover, the embodiments of the present invention may help to simply the design of DSLAM optimization system and achieve a proper balance between the DSLAM performance and the complexity.

摘要翻译： 公开了一种在xDSL系统中进行频谱管理的方法和装置。 该方法主要包括：根据线路的串扰状态确定发射PSD掩码; 使用发送PSD掩码执行IWF操作; 并根据IWF操作的结果动态管理线路频谱。 因此，本发明的各种实施例允许DSLAM性能近似OSM性能，而不需要中央控制器，并且在严格的串扰情况下使用相当简单的算法。 此外，本发明的实施例可以帮助简单地设计DSLAM优化系统，并且在DSLAM性能和复杂性之间实现适当的平衡。

公开(公告)号：US09071333B2

公开(公告)日：2015-06-30

申请号：US12481307

申请日：2009-06-09

申请人： Liming Fang

发明人： Liming Fang

IPC分类号： H04B3/23 ,  H04B3/32 ,  H04B3/487

CPC分类号： H04B3/32 ,  H04B3/487

摘要： A method for canceling crosstalk, the method includes the steps of: filtering the signal corresponding to a far end crosstalk source in the frequency domain according to adaptive filter parameter; combining the received signal corresponding to a far end sending signal and the filtered signal in frequency domain corresponding to the far end crosstalk source. A device for canceling crosstalk and a signal processing system.

摘要翻译： 一种消除串扰的方法，该方法包括以下步骤：根据自适应滤波器参数对与频域中的远端串扰源相对应的信号进行滤波; 组合对应于远端发送信号的接收信号和对应于远端串扰源的频域中的滤波信号。 用于消除串扰的装置和信号处理系统。

公开(公告)号：US08908749B2

公开(公告)日：2014-12-09

申请号：US12551246

申请日：2009-08-31

申请人： Liming Fang

发明人： Liming Fang

IPC分类号： H04B1/38 ,  H04M11/06 ,  H04L25/08 ,  H04B3/32 ,  H04L25/03 ,  H04L27/26

CPC分类号： H04L25/085 ,  H04B3/32 ,  H04L25/03828 ,  H04L27/2601 ,  H04M11/062

摘要： A method for controlling DSL transmission power includes: determining a group to which a line belongs, and selecting a representative line from each group to form a line model; obtaining a crosstalk model of the line model; obtaining Transmit Power Spectrum Density (TxPSD) of each representative line in the line model according to the crosstalk model, and converting the TxPSD into a spectrum control parameter; and enhancing the line rate according to the spectrum control parameter. An apparatus for controlling DSL transmission power is also disclosed. Through the method, the transmission power of the band that incurs serious line crosstalk is restricted, and the line that incurs serious crosstalk can achieve higher transmission rates. Therefore, the adverse impact from the crosstalk between xDSL lines is reduced, and the line works in the optimum state.

摘要翻译： 一种用于控制DSL传输功率的方法包括：确定一条线路所属的组，并从每个组中选择一条代表线以形成线路模型; 获得线模型的串扰模型; 根据串扰模型获得线路模型中每个代表线的发射功率谱密度（TxPSD），并将TxPSD转换为频谱控制参数; 并根据频谱控制参数提高线路速率。 还公开了一种用于控制DSL传输功率的装置。 通过该方法，导致严重线路串扰的频带的发射功率受到限制，并且导致严重串扰的线路可以实现更高的传输速率。 因此，xDSL线路之间串扰的不利影响降低，线路处于最佳状态。

公开(公告)号：US08873565B2

公开(公告)日：2014-10-28

申请号：US13447748

申请日：2012-04-16

申请人： Liming Fang ,  Jim Chen ,  Kira Zhang

发明人： Liming Fang ,  Jim Chen ,  Kira Zhang

IPC分类号： H04L12/56

CPC分类号： H04B10/2575 ,  H04B10/27 ,  H04J14/08 ,  H04L12/00 ,  H04Q11/0067 ,  H04Q11/0071 ,  H04Q2011/0064 ,  H04Q2011/0086

摘要： An apparatus for interconnecting a fiber-optic network and a coax network comprising a coax line terminal (CLT) configured to couple to an optical line terminal (OLT) at the fiber-optic network and a plurality of coax network units (CNUs) at the coax network and to cache data received from the CNUs and forward the cached data to the OLT upon receiving a message from the OLT that assigns a transmission cycle for a specified CNU, wherein the CLT forwards the cached data to the OLT upon receiving the message regardless of whether the cached data corresponds to the specified CNU.

摘要翻译： 一种用于互连光纤网络和同轴电缆网络的装置，包括被配置为耦合到光纤网络处的光线路终端（OLT）的同轴线路终端（CLT）和在该光纤网络处的多个同轴电缆网络单元（CNU） 同轴网络和缓存从CNU接收的数据，并且在从OLT接收到为指定的CNU分配传输周期的消息时将缓存的数据转发到OLT，其中CLT在接收到消息时将缓存的数据转发到OLT 缓存数据是否对应于指定的CNU。

公开(公告)号：US08711669B2

公开(公告)日：2014-04-29

申请号：US13484760

申请日：2012-05-31

申请人： Liming Fang ,  Jie Lv ,  Huishen Dong

发明人： Liming Fang ,  Jie Lv ,  Huishen Dong

IPC分类号： H04M11/00

CPC分类号： H04M11/062 ,  H04B3/32

摘要： An xDSL signal transmission method includes: receiving 2N−1 signals from 2N−1 signal input ends, where each signal in the 2N−1 signals is a signal transmitted by an independent channel in the xDSL system; pre-multiplying a (2N−1)×1 matrix formed by the 2N−1 signals by a first conversion matrix to obtain a 2N×1 matrix, where elements in the 2N×1 matrix respectively correspond to 2N signals, and the first conversion matrix is a 2N×(2N−1) matrix; and sending the 2N signals via N twisted pair lines respectively. The N twisted pair lines can transmit signals of 2N−1 channels, thereby increasing the number of signal transmissions, and improving signal transmission efficiency.

摘要翻译： xDSL信号发送方法包括：从2N-1个信号输入端接收2N-1个信号，其中2N-1个信号中的每个信号是由xDSL系统中的独立信道发送的信号; 将由2N-1信号形成的（2N-1）×1矩阵预先乘以第一转换矩阵，以获得2N×1矩阵，其中2N×1矩阵中的元素分别对应于2N个信号，并且第一转换 矩阵是2N×（2N-1）矩阵; 并分别通过N条双绞线发送2N个信号。 N双绞线可以发送2N-1个信道的信号，从而增加信号传输的数量，提高信号传输效率。

公开(公告)号：US08295369B2

公开(公告)日：2012-10-23

申请号：US13271903

申请日：2011-10-12

申请人： Liming Fang

发明人： Liming Fang

IPC分类号： H04B3/32 ,  H04B15/00 ,  H04J1/12 ,  H04L27/28

CPC分类号： H04B3/32 ,  H04B1/62 ,  H04J1/12 ,  H04L2012/6478

摘要： A method for remote crosstalk cancellation, includes: filtering, at a first transmitting end which is connected to a first receiving end over a first line, crosstalk source signals according to values of filtering parameters; synthesizing, at the first transmitting end, a first signal to be transmitted over the first line and the filtered crosstalk source signals; transmitting the synthesized signal from the first transmitting end to the first receiving end over the first line; receiving, at the first transmitting end, a noise statistic related value fed back from the first receiving end; and adjusting, at the transmitting end, the values of the filtering parameters according to the noise statistic related value. A corresponding device and a signal processing system for remote crosstalk cancellation are provided.

公开(公告)号：US20120207197A1

公开(公告)日：2012-08-16

申请号：US13371854

申请日：2012-02-13

申请人： Jie LV ,  Liming Fang

发明人： Jie LV ,  Liming Fang

IPC分类号： H04B17/00

CPC分类号： H04M11/062 ,  H04B3/32

摘要： In the field of communication, this application discloses a signal processing method, device, and system of bonded DSL channels. A signal processing method of bonded DSL channels: sending a pilot sequence to a receiving end through bonded channels; receiving, through the bonded channels, clipped error sample fragments returned by the receiving end, where the receiving end constructs a clipped error sample according to an error of a received signal and fragments the clipped error sample to acquire the clipped error sample fragments; aggregating the received clipped error sample fragments into a clipped error sample; and calculating a pre-encoding coefficient according to the pilot sequence and the aggregated clipped error sample, where the pre-encoding coefficient is used to perform pre-encoding processing on a signal before the signal is sent.

摘要翻译： 在通信领域中，本申请公开了一种信号处理方法，装置和绑定DSL信道的系统。 一种绑定DSL信道的信号处理方法：通过绑定信道向接收端发送导频序列; 通过绑定通道接收由接收端返回的剪辑的错误样本片段，其中接收端根据接收到的信号的错误构建剪切的错误样本，并将剪切的错误样本分片以获取剪切的错误样本片段; 将接收到的剪辑错误样本片段聚合为剪辑错误样本; 以及根据导频序列和聚合剪切误差样本计算预编码系数，其中预编码系数用于对发送信号之前的信号执行预编码处理。

公开(公告)号：US08958515B2

公开(公告)日：2015-02-17

申请号：US13096454

申请日：2011-04-28

申请人： Yi Cai ,  Ivan Chan ,  Liming Fang ,  Max J. Olsen

发明人： Yi Cai ,  Ivan Chan ,  Liming Fang ,  Max J. Olsen

IPC分类号： H04L7/00 ,  H04L25/00 ,  H04L25/40 ,  G06G7/16 ,  G01R31/317 ,  H04B15/04

CPC分类号： G06G7/16 ,  G01R31/31709 ,  H04B15/04 ,  H04L7/00

摘要： A system for controllably generating jitter in a serial data stream includes a frequency generator and first and second mixers. The frequency generator is configured to output in-phase and quadrature local oscillator signals with a local oscillator frequency of at least about 5 MHz. The local oscillator frequency varies between a selectable minimum frequency and a selectable maximum frequency. The first mixer is configured to mix a fixed frequency clock signal with the in-phase local oscillator signal to output a first mixer output. The second mixer is configured to mix the fixed frequency clock signal with the quadrature local oscillator signal to output a second mixer output. An adder is configured to add the first and second mixer outputs to produce a frequency-modulated clock signal with a frequency that is about the sum of the fixed frequency and the local oscillator frequency and includes a periodic jitter.

摘要翻译： 用于可控制地产生串行数据流中的抖动的系统包括频率发生器和第一和第二混频器。 频率发生器被配置为输出具有至少约5MHz的本地振荡器频率的同相和正交本地振荡器信号。 本地振荡器频率在可选择的最小频率和可选择的最大频率之间变化。 第一混频器被配置为将固定频率时钟信号与同相本地振荡器信号混频以输出第一混频器输出。 第二混频器被配置为将固定频率时钟信号与正交本地振荡器信号混频以输出第二混频器输出。 加法器被配置为添加第一和第二混频器输出以产生频率约为固定频率和本地振荡器频率之和的频率调制时钟信号，并且包括周期性抖动。