公开(公告)号：US09391813B2

公开(公告)日：2016-07-12

申请号：US12033792

申请日：2008-02-19

Applicant: Rama Akella ,  Roger Cheng

Inventor： Rama Akella ,  Roger Cheng

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

CPC classification number: H04L25/0232 ,  H04B3/493 ,  H04L25/022 ,  H04L27/2647 ,  H04L27/2665

Abstract: 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.

Abstract translation: 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

Applicant: Cable Television Laboratories, Inc.

Inventor： Thomas Holtzman Williams ,  Belal Hamzeh ,  Luis Alberto Campos

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

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

Abstract: 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

Applicant: DENSO CORPORATION

Inventor： Chao CHEN ,  Shigeki OTSUKA

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

Abstract: 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

Applicant: REALTEK SEMICONDUCTOR CORP.

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

IPC: H04B3/23 ,  H04B3/493

CPC classification number: H04B3/237 ,  H04B3/231 ,  H04B3/493

Abstract: 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.

Abstract translation: 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

Applicant: Michael Stegherr

Inventor： Michael Stegherr

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

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

Abstract: 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.

Abstract translation: 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

Applicant: SIEMENS AG

Inventor： DIETWALD THIERBACH

IPC: H04B3/493

CPC classification number: H04B3/493

公开(公告)号：US20240267456A1

公开(公告)日：2024-08-08

申请号：US18567585

申请日：2022-06-10

Applicant: BRITISH TELECOMMUNICATIONS PUBLIC LIMITED COMPANY

Inventor： Feiyu FANG ,  Lykourgos KEKEMPANOS ,  Daniel GILKS

IPC: H04M3/30 ,  H04B3/493

CPC classification number: H04M3/306 ,  H04B3/493 ,  H04M3/304

Abstract: A method of determining when there has been a change in the modem power state of a modem connected to a digital subscriber line. An Uncalibrated Echo Response (UER) trace is obtained from the digital subscriber line by running a Single Ended Line Test (SELT) on the line. This UER trace is compared to a historical (baseline) UER trace from the same line. A difference in the two traces in a higher frequency range (for example, DS3 for a VDSL line), is indicative of a possible modem power state change.

公开(公告)号：US20240267083A1

公开(公告)日：2024-08-08

申请号：US18290306

申请日：2022-02-08

Applicant: Sumitomo Electric Industries, Ltd.

Inventor： Masato IZAWA ,  Satoru SAKURAZAWA ,  Isao KATO ,  Takumi ASAINA

IPC: H04B3/493 ,  H04B3/23 ,  H04B3/487

CPC classification number: H04B3/493 ,  H04B3/235 ,  H04B3/487

Abstract: A detection apparatus is provided for a signal transmission apparatus, the signal transmission apparatus being configured to receive a reception signal via a transmission line and including an adaptive filter to be applied to the reception signal. The detection apparatus includes an acquisition unit configured to acquire a filter coefficient of the adaptive filter, and a detection unit configured to detect an abnormality in the transmission line, based on an amount of change over time in the filter coefficient acquired by the acquisition unit.

公开(公告)号：US11909908B2

公开(公告)日：2024-02-20

申请号：US17142377

申请日：2021-01-06

Applicant: Nokia Solutions and Networks Oy

Inventor： Nicolas Dupuis ,  Gert-Jan Stockman ,  Philippe Dierickx ,  Paschalis Tsiaflakis

IPC: H04M3/30 ,  H04M1/24 ,  H04B3/493 ,  H04M3/22 ,  H04B3/23 ,  G06N3/008 ,  H04B3/20

CPC classification number: H04M3/306 ,  H04B3/23 ,  H04B3/493 ,  H04M1/24 ,  H04M3/22 ,  G06N3/008 ,  H04B3/20

Abstract: Embodiments relate to an apparatus comprising means configured for:



obtaining echo response data representative of the echo response of a communication line, wherein the echo response data specifies the echo response based on two dimensions and includes first dimension data and second dimension data,
determining at least one property of the communication line based on processing the echo response data with a neural network, wherein the neural network comprises at least:

a first convolutional branch for processing the first dimension data,
a second convolutional branch for processing the second dimension data,
a dense part for processing the outputs of the first and second convolutional branches.

公开(公告)号：US11271607B2

公开(公告)日：2022-03-08

申请号：US16675685

申请日：2019-11-06

Applicant: Rohde & Schwarz GmbH & Co. KG

Inventor： Michael Feilen

IPC: H04B3/493 ,  G01R31/58 ,  H04B3/48

Abstract: A testing of a transmission path of a cable connection between a first position and a second position is provided. Test signals are transmitted via the transmission path, and a transfer function is determined by evaluating the test signals. In order to assess the properties of the transmission path, the transfer function is transformed to an impulse response and the echo power of the transmission path is evaluated by analyzing the impulse response.