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1. 发明授权

US09391813B2 Long echo detection and channel estimation for OFDM systems 有权
标题翻译： OFDM系统的长回波检测和信道估计
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。

2. 发明申请

US20180302122A1 TRANSMISSION-PATH DEGRADATION DETECTION APPARATUS 审中-公开
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.

3. 发明申请

US20160233920A1 CHANNEL DETECTION METHOD AND SYSTEM THEREOF 有权
标题翻译：通道检测方法及其系统
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。

4. 发明申请

US20050008068A1 Adsl pre-qualification method comprising echo-canceller optimisation with maximum selectivity 审中-公开
标题翻译： Adsl预认证方法包括具有最大选择性的回波消除器优化
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。

5. 发明授权

US1743408A Measurement of echo effects in transmission systems 失效
标题翻译：传输系统中回波效应的测量
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

6. 发明授权

US11271607B2 Test system and method for testing a transmission path of a cable connection between a first and a second position 有权
公开(公告)号：US11271607B2
公开(公告)日：2022-03-08
申请号：US16675685
申请日：2019-11-06
申请人： Rohde & Schwarz GmbH & Co. KG
发明人： Michael Feilen
IPC分类号： H04B3/493 , G01R31/58 , H04B3/48
摘要： 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.

7. 发明申请

US20210250062A1 METHOD AND APPARATUS FOR MONITORING A COMMUNICATION LINE 有权
公开(公告)号：US20210250062A1
公开(公告)日：2021-08-12
申请号：US17142377
申请日：2021-01-06
申请人： Nokia Solutions and Networks Oy
发明人： Nicolas DUPUIS , Gert-Jan STOCKMAN , Philippe DIERICKX , Paschalis TSIAFLAKIS
IPC分类号： H04B3/493 , H04B3/20 , G06N3/00
摘要： 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.

8. 发明授权

US11025297B2 Full-duplex cancellation 有权
公开(公告)号：US11025297B2
公开(公告)日：2021-06-01
申请号：US15802060
申请日：2017-11-02
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
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.

9. 发明申请

US20190215031A1 SYSTEMS AND METHODS FOR ECHO OR INTERFERENCE CANCELLATION POWER-SAVING MANAGEMENT IN A COMMUNICATION SYSTEM 审中-公开
公开(公告)号：US20190215031A1
公开(公告)日：2019-07-11
申请号：US16240037
申请日：2019-01-04
申请人： Marvell World Trade Ltd.
发明人： Shaoan Dai , Kok-Wui Cheong , Zhenzhong Gu
IPC分类号： H04B3/20 , H04B3/04 , H04B3/493 , H04B1/38
CPC分类号： H04B3/20 , H04B1/38 , H04B3/04 , H04B3/493
摘要： Embodiments described herein provide echo cancellation power saving management at a cable transceiver. An echo response signal having a first number of signal components is obtained, via an echo cancellation filter. At a first iteration for calculating a first accumulative echo power, a respective echo tap that corresponds to the first iteration is identified. The first accumulative echo power is calculated for the respective iteration by summing powers of outputs from a last echo tap to the respective echo tap. It is then determined whether the first accumulative echo power, exceeds a pre-determined echo power threshold. If the first accumulative echo power exceeds the pre-determined echo power threshold, a first turn-off indication is sent to the echo cancellation filter to turn off all echo taps including and between the last echo tap to the first echo tap.

10. 发明申请

US20180152326A1 Channel Quality Indicator for Wireline Channel Degradation Detection 审中-公开
公开(公告)号：US20180152326A1
公开(公告)日：2018-05-31
申请号：US15878334
申请日：2018-01-23
申请人： Marvell World Trade Ltd.
发明人： Shaoan Dai , Zhenzhong Gu , Kok-Wui Cheong
IPC分类号： H04L25/03 , H04B3/23 , H04B17/309 , H04B3/493
CPC分类号： H04L25/03057 , H04B3/23 , H04B3/235 , H04B3/237 , H04B3/493 , H04B17/309 , H04L25/03146 , H04L25/03885 , H04L2025/03802
摘要： Systems and techniques relating to channel degradation detection for communication systems are described. A described system includes a processor and an interface to transmit signals and receive signals via a channel that includes a cable. The processor can be configured to perform echo cancellation based on echo tap values to remove portions of the transmitted signals that appear as echoes within the received signals, signal equalization based on equalizer tap values, or both. The processor can be configured to determine a channel quality indicator of the channel based on one or more of the echo tap values, one or more of the equalizer tap values, or both. The processor can be configured to generate a warning indication based on the channel quality indicator indicating a degradation of the cable or the channel.

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