公开(公告)号：US20120189086A1

公开(公告)日：2012-07-26

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 ,  G06G7/16

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机振荡器信号。 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。

公开(公告)号：US08160126B2

公开(公告)日：2012-04-17

申请号：US13096650

申请日：2011-04-28

申请人： Liming Fang ,  Jianping Tu

发明人： Liming Fang ,  Jianping Tu

IPC分类号： H04B1/38 ,  H04L27/04 ,  H04L12/26

CPC分类号： H04B3/32 ,  H04L12/66 ,  H04M11/062

摘要： A method, a device and a system for Upstream Power Back-Off (UPBO) in a Digital Subscriber Line (DSL) are provided. The method includes: collecting subscriber line information (S50); determining a reference line length according to the subscriber line information (S52); obtaining UPBO parameters of each upstream band of each subscriber line according to the determined reference line length (S54), where the UPBO parameters include an original point parameter, a back-off slope parameter, and a maximal close frequency point (UPBOFMAX) corresponding to the band; and executing an UPBO process on the band of the corresponding subscriber line below the UPBOFMAX according to the UPBO parameters (S58). Thus, the stability of longer lines can be ensured, an upstream rate of short lines is maximally increased, and the existing UPBO mode is fully compatible.

摘要翻译： 提供了一种用于数字用户线路（DSL）中的上行功率回退（UPBO）的方法，设备和系统。 该方法包括：收集用户线路信息（S50）; 根据用户线路信息确定参考线路长度（S52）; 根据确定的参考线路长度（S54）获得每个用户线路的每个上行频带的UPBO参数，其中，所述UPBO参数包括原始点参数，退避斜率参数和对应于所述最大接近频率点（UPBOFMAX） 乐队; 以及根据UPBO参数在UPBOFMAX之下的相应用户线的频带上执行UPBO处理（S58）。 因此，可以确保更长的线路的稳定性，短线路的上行速率最大化，并且现有的UPBO模式是完全兼容的。

公开(公告)号：US08045446B2

公开(公告)日：2011-10-25

申请号：US12539772

申请日：2009-08-12

申请人： Liming Fang

发明人： Liming Fang

IPC分类号： H04J1/12

CPC分类号： H04B3/32 ,  H04M3/304 ,  H04M3/34 ,  H04M11/062

摘要： A method for eliminating DSL crosstalk is provided. The method includes steps of a coordinated transceiver device notifies an existing online opposite device of a signal sent to a new online opposite device; the coordinated transceiver device receives a calculation result that is obtained by the existing online opposite device based on a detected error signal and the signal sent to the new online opposite device, the coordinated transceiver device updates the coefficient of a vector pre-encoder according to the calculation result. A computer program tangibly embodied on a computer-readable storage medium, computer-readable storage medium, DSL opposite device, DSL coordinated transceiver device and system for eliminating the DSL crosstalk are also provided to implement the method. The provided method may reduce the duration of the crosstalk that the new online opposite device generates on the existing online opposite device, and enable the new online opposite device to join a vector group faster.

摘要翻译： 提供了消除DSL串扰的方法。 该方法包括以下步骤：协调的收发机设备向现有的在线对方设备通知发送到新的在线对方设备的信号; 协调收发器装置基于检测到的误差信号和发送到新的在线对置设备的信号接收现有的在线对方装置获得的计算结果，协调收发器装置根据所述向量预编码器的系数更新 计算结果。 还提供了有形地体现在计算机可读存储介质，计算机可读存储介质，DSL相对设备，DSL协调收发器设备和用于消除DSL串扰的系统的计算机程序以实现该方法。 所提供的方法可以减少新的在线对等设备在现有的在线对侧设备上产生的串扰的持续时间，并且使得新的在线对等设备能够更快地加入向量组。

公开(公告)号：US07894484B2

公开(公告)日：2011-02-22

申请号：US12351598

申请日：2009-01-09

申请人： Liming Fang

发明人： Liming Fang

IPC分类号： H04J1/00

CPC分类号： H04B3/32 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/006 ,  H04L5/20 ,  H04L12/2881 ,  H04L12/4633 ,  H04L12/5601 ,  H04L2012/5618 ,  H04L2012/5665 ,  H04M11/062 ,  H04Q11/0428 ,  H04Q2213/13196 ,  H04Q2213/13204 ,  H04Q2213/1329 ,  H04Q2213/13389 ,  H04Q2213/13399

摘要： The present disclosure discloses a method for common transmission over multiple line pairs, and a transmitting device and a receiving device therefor. The method for common transmission over multiple line pairs includes: modulating information to be sent; and sending a modulated signal to a receiving device over the multiple line pairs; wherein, a transmission spectrum of each transmitter in the multiple line pairs comprises two parts: a first part is a frequency segment that meets a bearer condition of a modulation method, and a second part is a frequency segment that does not meet the bearer condition of the modulation method.

摘要翻译： 本公开公开了一种用于通过多个线对的公共传输的方法，以及用于其的发送设备和接收设备。 用于多条线对上的公共传输的方法包括：调制要发送的信息; 以及通过所述多个线对将调制信号发送到接收设备; 其中，所述多个线路对中的每个发射机的发射频谱包括两部分：第一部分是满足调制方式的载体状态的频段，第二部分是不满足载波状态的频段 调制方式。

公开(公告)号：US20100296648A1

公开(公告)日：2010-11-25

申请号：US12847111

申请日：2010-07-30

申请人： Liming Fang ,  Cheng Li

发明人： Liming Fang ,  Cheng Li

IPC分类号： H04M1/76

CPC分类号： H04B3/32 ,  H04L5/0037 ,  H04L5/0062 ,  H04L5/1423 ,  H04M3/34 ,  H04M11/062

摘要： A method for line management includes: acquiring running parameters of a subscriber line; computing a transmitting power spectral density, PSD, and reference virtual noise of the subscriber line according to the running parameters; activating the subscriber line according to the transmitting PSD and the reference virtual noise. A device and system for line management are provided correspondingly. Reference virtual noise needed by virtual noise technology is set rationally according to the information provided by dynamic spectrum management, DSM, Level 2 algorithm. The utilization of the virtual noise technology improves the line stability under the DSM Lever 2 algorithm, and has an effect of optimizing the subscriber line.

摘要翻译： 线路管理方法包括：获取用户线的运行参数; 根据运行参数计算用户线的发射功率谱密度，PSD和参考虚拟噪声; 根据传输PSD和参考虚拟噪声激活用户线路。 相应地提供用于线路管理的设备和系统。 根据动态频谱管理DSM，Level 2算法提供的信息合理设置虚拟噪声技术所需的虚拟噪声参考。 虚拟噪声技术的利用提高了DSM Lever 2算法下的线路稳定性，具有优化用户线的效果。

公开(公告)号：US20090323787A1

公开(公告)日：2009-12-31

申请号：US12551664

申请日：2009-09-01

申请人： Liming Fang ,  Raphael Cendrillon

发明人： Liming Fang ,  Raphael Cendrillon

IPC分类号： H04B1/38 ,  H04B17/00

CPC分类号： H04B3/464 ,  H04B3/32 ,  H04B3/487 ,  H04L5/14 ,  H04L25/0204 ,  H04L25/0212 ,  H04M11/062

摘要： A method for channel estimation includes: loading a combination of signals sent on other lines over a line of a channel; measuring a signal-to-noise ratio (SNR) of the loaded line; and calculating crosstalk channels of the loaded line according to a coefficient of the combination of signals sent on other lines and the measured SNR. Accordingly, a device and system for channel estimation are provided. The technical solution of the present invention may be used for relevant systems such as an x Digital Subscriber Line (xDSL) system.

摘要翻译： 用于信道估计的方法包括：在通道的一行上加载在其他线路上发送的信号的组合; 测量装载线路的信噪比（SNR）; 以及根据在其他线路上发送的信号的组合的系数和所测量的SNR来计算加载线路的串扰信道。 因此，提供了用于信道估计的装置和系统。 本发明的技术方案可用于诸如x数字用户线（xDSL）系统的相关系统。

公开(公告)号：US20090245503A1

公开(公告)日：2009-10-01

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

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：US09258790B2

公开(公告)日：2016-02-09

申请号：US11945338

申请日：2007-11-27

申请人： W Yu ,  J Yuan ,  Liming Fang

发明人： W Yu ,  J Yuan ,  Liming Fang

IPC分类号： H04B3/20 ,  H04W52/34 ,  H04B3/32 ,  H04L1/00 ,  H04L5/00

CPC分类号： H04W52/346 ,  H04B3/32 ,  H04L1/0001 ,  H04L5/0007 ,  H04L5/0037 ,  H04L5/0044 ,  H04L5/006 ,  H04L5/0062

摘要： The present invention provides a dynamic power spectrum management method, a spectrum optimization system, and a client device, which can improve spectrum management. The method includes: calculating, from a tax factor containing user crosstalk information, a water-filling parameter corresponding to the case that total power of each user is below or equal to a threshold of total power of the user; calculating, from the water-filling parameter, power allocated to each user in each sub-carrier until convergence is attained for all users. Correspondingly, the present invention further provides a spectrum optimization system and a client device. In effect, the present invention can improve the spectrum management.

摘要翻译： 本发明提供了可以改进频谱管理的动态功率谱管理方法，频谱优化系统和客户端设备。 该方法包括：从包含用户串扰信息的税收因子计算与每个用户的总功率低于或等于用户总功率阈值的情况相对应的充水参数; 从灌水参数计算分配给每个子载体中每个用户的功率，直到所有用户达到收敛。 相应地，本发明还提供一种频谱优化系统和客户端设备。 实际上，本发明可以改进频谱管理。

公开(公告)号：US08565418B2

公开(公告)日：2013-10-22

申请号：US13482642

申请日：2012-05-29

申请人： Cheng Li ,  Guozhu Long ,  Jie Lv ,  Huishen Dong ,  Liming Fang

发明人： Cheng Li ,  Guozhu Long ,  Jie Lv ,  Huishen Dong ,  Liming Fang

IPC分类号： H04M7/00

CPC分类号： H04L5/20 ,  H04L25/0272

摘要： The present invention provides a method, a device and a system for extending channels, and belongs to the field of communications technologies. The method includes: generating a non-cascade extended channel by using a first channel and a second channel; and generating a first-level cascade extended channel by using the non-cascade extended channel and a third channel, where the first channel and the second channel are both twisted-pair channels, and the third channel is a twisted-pair channel or another non-cascade extended channel. The device includes a first transformer and a second transformer. The system includes a first device and a second device.

摘要翻译： 本发明提供一种用于扩展信道的方法，装置和系统，属于通信技术领域。 该方法包括：通过使用第一信道和第二信道来产生非级联扩展信道; 以及通过使用非级联扩展信道和第三信道来生成第一级级联扩展信道，其中第一信道和第二信道都是双绞线信道，并且第三信道是双绞线信道或另一非信道 级联扩展通道。 该装置包括第一变压器和第二变压器。 该系统包括第一设备和第二设备。

公开(公告)号：US08537912B2

公开(公告)日：2013-09-17

申请号：US13034353

申请日：2011-02-24

申请人： Guozhu Long ,  Amir H. Fazlollahi ,  Liming Fang ,  Yuchen Jia

发明人： Guozhu Long ,  Amir H. Fazlollahi ,  Liming Fang ,  Yuchen Jia

IPC分类号： H04K1/10

CPC分类号： H04L25/14 ,  H04L5/0007 ,  H04L27/28 ,  H04M11/062

摘要： Disclosed is an apparatus that includes a plurality of parallel digital signal transmitters that each receive one of a plurality of digital sub-signals wherein each of the plurality of digital signal transmitters is configured to transmit one of the plurality of digital sub-signals that each have about the same bandwidth. The apparatus also includes a combiner coupled to the transmitters and configured to shift some of the plurality of digital sub-signals and to combine the plurality of shifted digital sub-signals into a combined digital signal that has a total bandwidth of that is approximately equal to the sum of the bandwidths of the plurality of digital sub-signals. The total bandwidth comprises a plurality of shifted bandwidths of the plurality of digital sub-signals at about the same offset with respect to each other. The combined digital signal is transmitted over a digital subscriber loop.

摘要翻译： 公开了一种装置，其包括多个并行数字信号发射机，每个并行数字信号发射机都接收多个数字子信号中的一个，其中多个数字信号发射机中的每一个被配置为发送每个数字子信号中的每一个 大约相同的带宽。 该装置还包括组合器，其耦合到发射机并且被配置为移动多个数字子信号中的一些并且将多个移位的数字子信号组合成具有总共带宽的组合数字信号近似等于 多个数字子信号的带宽之和。 总带宽包括相对于彼此大致相同偏移的多个数字子信号的多个移位带宽。 组合的数字信号通过数字用户回路传输。