公开(公告)号：US09391813B2

公开(公告)日：2016-07-12

申请号：US12033792

申请日：2008-02-19

申请人： Rama Akella ,  Roger Cheng

发明人： Rama Akella ,  Roger Cheng

IPC分类号： H04L25/02 ,  H04L27/26 ,  H04B3/493

CPC分类号： H04L25/0232 ,  H04B3/493 ,  H04L25/022 ,  H04L27/2647 ,  H04L27/2665

摘要： A method and an apparatus are provided in an OFDM receiver for detecting and compensating for long echo. The method comprises a first pilot tone interpolation mechanism and a first window placement to filter a received OFDM symbol, a long echo channel detection coupled with a second pilot tone interpolation mechanism, a pre-echo and post-echo detection wherein the pre-echo condition is associated with a second new window placement, and both pre-echo and post-echo conditions place two time windows around a first peak channel response and a second peak channel response for channel estimation. The long echo is estimated by obtaining power spectra of a subset of subcarriers in one OFDM symbol, performing an inverse Fourier transform on the power spectra and determining the long echo by measuring the time between two peaks in the power profile.

摘要翻译： 在OFDM接收机中提供了一种用于检测和补偿长回波的方法和装置。 该方法包括第一导频音插值机制和第一窗口布局以过滤接收到的OFDM符号，与第二导频音插值机制耦合的长回波信道检测，前回波和后回波检测，其中预回波条件 与第二新窗口放置相关联，并且回波前和回波之间的两个条件都围绕第一峰值通道响应和第二峰值通道响应放置两个时间窗口用于信道估计。 通过在一个OFDM符号中获得子载波子集的功率谱来估计长回波，对功率谱进行傅里叶逆变换，并通过测量功率曲线中两个峰之间的时间来确定长回波。

公开(公告)号：US11888545B1

公开(公告)日：2024-01-30

申请号：US17334884

申请日：2021-05-31

申请人： Cable Television Laboratories, Inc.

发明人： Thomas Holtzman Williams ,  Belal Hamzeh ,  Luis Alberto Campos

IPC分类号： H04B3/23 ,  H04N7/173 ,  H04B10/25 ,  G06F1/02 ,  H04B3/493 ,  H04L5/14 ,  H04N21/61

CPC分类号： H04B3/235 ,  H04B3/238 ,  H04B10/25891 ,  H04N7/17309 ,  G06F1/022 ,  H04B3/493 ,  H04L5/14 ,  H04N21/6118 ,  H04N21/6168

摘要： Facilitating echo cancellation within communication networks is contemplated, such as but not necessarily limited to facilitating echo cancellation within full-duplex (FDX) communication networks. The echo cancellation may optionally be performed with an echo canceller included as part of or otherwise associated with an FDX node used to facilitate interfacing signaling between a digital domain and an analog domain of a FDX or other communication network.

公开(公告)号：US20180302122A1

公开(公告)日：2018-10-18

申请号：US15770507

申请日：2016-11-28

申请人： DENSO CORPORATION

发明人： Chao CHEN ,  Shigeki OTSUKA

IPC分类号： H04B3/493 ,  H04B3/23 ,  H04B3/06 ,  G01R31/11

摘要： A transmission-path degradation detection apparatus comprises a transmission path of a transmission system, plural communication devices connected to the transmission path, a signal generation part provided in one communication device of the plural communication devices for generating a pseudo-communication signal, and a degradation detection part provided in one communication device of the plural communication devices for detecting a degradation of the transmission path based on a reception of the pseudo-communication signal passing through the transmission path.

公开(公告)号：US20160233920A1

公开(公告)日：2016-08-11

申请号：US15005764

申请日：2016-01-25

申请人： REALTEK SEMICONDUCTOR CORP.

发明人： Shih-Wei Wang ,  Liang-Wei Huang ,  Ching-Yao Su ,  Sheng-Fu Chuang

IPC分类号： H04B3/23 ,  H04B3/493

CPC分类号： H04B3/237 ,  H04B3/231 ,  H04B3/493

摘要： A channel detection method for an echo canceller of a communication device is provided. The method includes the following steps. A first detection signal is transmitted to an end of a channel coupled to the communication device. A plurality of taps corresponding to a reflected signal of the first detection signal are received by an echo canceller at the end of the channel. The taps corresponding to the reflected signal are compared with a reference value corresponding to each of the taps so as to determine whether each of the taps is larger than or equal to the corresponding reference value. When the tap is determined to be larger than or equal to the reference value corresponding to the tap, the tap and a position of the tap are recorded.

摘要翻译： 提供了一种用于通信设备的回波消除器的信道检测方法。 该方法包括以下步骤。 第一检测信号被发送到耦合到通信设备的信道的一端。 对应于第一检测信号的反射信号的多个抽头由通道末端的回波消除器接收。 将与反射信号对应的抽头与对应于每个抽头的参考值进行比较，以便确定每个抽头是否大于或等于对应的参考值。 当水龙头被确定为大于或等于对应于水龙头的参考值时，记录水龙头和水龙头的位置。

公开(公告)号：US20050008068A1

公开(公告)日：2005-01-13

申请号：US10494793

申请日：2002-11-07

申请人： Michael Stegherr

发明人： Michael Stegherr

IPC分类号： H04B3/493 ,  H04L1/24 ,  H04L12/26 ,  H04L25/02 ,  H04M3/00 ,  H04M3/30 ,  H04L5/16

CPC分类号： H04L43/50 ,  H04B3/493 ,  H04L1/243 ,  H04L1/244 ,  H04L25/0212 ,  H04M3/002 ,  H04M3/30

摘要： The invention relates to a method for determining one or more characteristics of a line, in addition to a device for determining one or more characteristics of a line that can be directly or indirectly connected to the device. Said device is configured in such a way that it can trigger the emission of a test signal on the line and determine the line characteristic or characteristics from the echo signal received via the line. The device has a signal transformation unit for transforming the echo signal or a signal obtained from said echo signal into the frequency range, the line characteristic or characteristics being determined from a vector that represents the intensity of individual spectral fractions of the frequency range. The invention is characterised in that the device has s signal processing unit, to which the untransformed echo signal or the untransformed signal obtained therefrom is fed, and that the line characteristic or characteristics is/are determined from the comparison of the vector that represents the intensity of individual spectral fractions of the frequency range with several model vectors. The signal processing unit processes the echo signal or the signal obtain therefrom in such a way that model vectors can be chosen so that they are at the greatest possible euclidic distances from one another.

摘要翻译： 本发明涉及一种用于确定线路的一个或多个特性的方法，除了用于确定可以直接或间接地连接到该设备的线路的一个或多个特性的设备之外。 所述装置被配置成使得它可以触发线路上的测试信号的发射，并根据经由线路接收到的回波信号确定线路特性或特性。 该装置具有用于将回波信号或从所述回波信号获得的信号变换为频率范围的信号变换单元，该线路特性或特性由表示频率范围的各个频谱分数的强度的矢量确定。 本发明的特征在于，该装置具有信号处理单元，未转换的回波信号或从其获得的未转换信号被馈送到该信号处理单元，并且线性特征或特性根据代表强度的矢量的比较来确定 的频率范围的单个频谱分数与几个模型向量。 信号处理单元处理回波信号或从其获得的信号，使得可以选择模型向量使得它们彼此处于最大可能的欧几里德距离。

公开(公告)号：US1743408A

公开(公告)日：1930-01-14

申请号：US17453927

申请日：1927-03-11

申请人： SIEMENS AG

发明人： DIETWALD THIERBACH

IPC分类号： H04B3/493

CPC分类号： H04B3/493

公开(公告)号：US20240162934A1

公开(公告)日：2024-05-16

申请号：US18495470

申请日：2023-10-26

申请人： Avago Technologies International Sales Pte. Limited

发明人： Avraham Kliger ,  Hagay Garti ,  Yitshak David Ohana

IPC分类号： H04B3/493 ,  H04B3/23

CPC分类号： H04B3/493 ,  H04B3/23

摘要： An amplifier for a cable network includes circuitry configured to provide a diagnostic parameter. Exemplary parameter include one or more of: measurements of a frequency response, suckouts in the frequency domain, north upstream echo signal or power, north downstream signal or power, north upstream echo to downstream power ratio, north upstream echo to residual echo power ratio, downstream echo canceller coefficients, south downstream signal or power, upstream information, south downstream echo signal or power, south upstream signal or power, south downstream echo to upstream power ratio, south downstream echo to residual echo power ratio, upstream echo canceller coefficients, and north upstream signal or power.

公开(公告)号：US11343061B2

公开(公告)日：2022-05-24

申请号：US16702628

申请日：2019-12-04

申请人： Marvell World Trade Ltd.

发明人： Xing Wu

IPC分类号： H04L5/14 ,  H04B3/23 ,  H04L43/0829 ,  H04L41/16 ,  H04B3/493 ,  H04L1/00 ,  H04L1/20

摘要： An Ethernet transceiver includes physical-layer (PHY) circuitry and a signal-loss detector. The PHY circuitry is configured to receive a signal from a peer transceiver, to process the received signal in a series of digital PHY-level processing operations, and to output the processed signal for Medium Access Control (MAC) processing. The signal-loss detector is configured to receive, from the PHY circuitry, a digital version of the received signal, and to detect a signal-loss event based on an amplitude of the digital version of the received signal.

公开(公告)号：US10361748B2

公开(公告)日：2019-07-23

申请号：US15871485

申请日：2018-01-15

申请人： Futurewei Technologies, Inc.

发明人： Xiaolong Zhang ,  Fan Wang ,  Tao Ouyang ,  Li Zhang ,  James Jeng Chen

IPC分类号： H04B3/20 ,  H04B3/493

摘要： Disclosed herein is a multi-stage echo cancellation scheme. The disclosed embodiments include an apparatus and method for monitoring and canceling echoes greater than 25 dB in a coaxial cable plant. The method includes obtaining echo channel estimate coefficients from a cable node. The method determines a location and strength of each partial echo in an impulse response using the echo channel estimate coefficients. Optionally, the method determines a frequency response of each partial echo in the impulse response.

公开(公告)号：US10312968B2

公开(公告)日：2019-06-04

申请号：US15397603

申请日：2017-01-03

申请人： CISCO TECHNOLOGY, INC.

发明人： Hang Jin

IPC分类号： H04L12/24 ,  H04L12/26 ,  H04B3/46 ,  H04B3/52 ,  H04L29/08 ,  H04B3/14 ,  H04B3/493 ,  G01R31/3181 ,  G01R31/3193 ,  H04L12/64 ,  H04L5/00 ,  H04L27/26

摘要： One embodiment is a system including a data collector located in a cable network for capturing multi-tone signals traversing the cable network; a data repository located in a cloud network and having an interface for communicating with the data collector and for storing the multi-tone signals captured by the data collector and network data associated with the cable network; and a central server including a memory element storing Predictive Services Management (PSM) algorithms comprising instructions and associated data and a processor operable to execute the PSM algorithms. The central server is configured for detecting a fault in the cable network and identifying a segment associated with the fault; determining a maximum tap magnitude for the fault; calculating an aggregate tap magnitude for the fault; and classifying a severity of the fault based at least in part on the maximum tap magnitude and the aggregate tap magnitude.