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：US08842822B2

公开(公告)日：2014-09-23

申请号：US13837932

申请日：2013-03-15

Applicant: John Whitehouse ,  Scott Dendy

Inventor： John Whitehouse ,  Scott Dendy

IPC: H04M7/04 ,  H04M9/00 ,  H04M1/76 ,  H04B3/46 ,  H04M1/24 ,  H04B3/23 ,  H04M1/253 ,  H04M3/18

CPC classification number: H04B3/23 ,  H04B3/493 ,  H04M1/24 ,  H04M1/2535 ,  H04M1/76 ,  H04M3/18

Abstract: A system and method in accordance with a non-limiting aspect minimizes echo return loss in a communications system. The dial tone is broken on an analog telephone line connected to a hybrid circuit having selectable impedance configurations and that interfaces a digital communications circuit and the analog telephone line. A white noise signal as a test call is inserted through the hybrid circuit onto the analog telephone line corresponding to a selected impedance configuration. The returned white noise signal is used for measuring the echo return loss. The test call is dropped. This process is repeated at different impedance configurations to obtain echo return loss measurements at each of the impedance configurations. The optimum impedance setting configuration is determined based on the results and applied to the hybrid circuit and typically set during a running telephone configuration.

Abstract translation: 根据非限制性方面的系统和方法使通信系统中的回波损耗最小化。 在连接到具有可选阻抗配置的混合电路并且连接数字通信电路和模拟电话线的模拟电话线上，拨号音被破坏。 将作为测试呼叫的白噪声信号通过混合电路插入到对应于所选阻抗配置的模拟电话线上。 返回的白噪声信号用于测量回波回波损耗。 测试呼叫被丢弃。 该过程在不同的阻抗配置下重复，以在每个阻抗配置下获得回波回波损耗测量。 基于结果确定最佳阻抗设置配置，并将其应用于混合电路，并且通常在运行的电话配置期间设置。

公开(公告)号：US20140211836A1

公开(公告)日：2014-07-31

申请号：US14227827

申请日：2014-03-27

Applicant: AWARE, INC.

Inventor： Murat Belge

IPC: H04L25/02

CPC classification number: H04B3/493 ,  H04B3/46 ,  H04L1/004 ,  H04L1/24 ,  H04L1/245 ,  H04L5/1438 ,  H04L25/0202 ,  H04L25/0216 ,  H04L43/50 ,  H04M3/085 ,  H04M3/2209 ,  H04M3/2227 ,  H04M3/306

Abstract: Through the use of a least squares minimization concept, the loop length, the number of bridged taps and length of the bridged taps on a transmission line can be determined from readily available modem data. In particular, the loop length, the number of bridge taps and the length of bridged taps can be estimated by comparing a measured frequency domain channel impulse response of the transmission line to a model of a loop that is comprised of multiple sections and multiple bridge taps.

公开(公告)号：US20140036979A1

公开(公告)日：2014-02-06

申请号：US14046723

申请日：2013-10-04

Applicant: AWARE, INC.

Inventor： Murat Belge

IPC: H04L1/00

CPC classification number: H04B3/493 ,  H04B3/46 ,  H04L1/004 ,  H04L1/24 ,  H04L1/245 ,  H04L5/1438 ,  H04L25/0202 ,  H04L25/0216 ,  H04L43/50 ,  H04M3/085 ,  H04M3/2209 ,  H04M3/2227 ,  H04M3/306

Abstract: Through the use of a least squares minimization concept, the loop length, the number of bridged taps and length of the bridged taps on a transmission line can be determined from readily available modem data. In particular, the loop length, the number of bridge taps and the length of bridged taps can be estimated by comparing a measured frequency domain channel impulse response of the transmission line to a model of a loop that is comprised of multiple sections and multiple bridge taps.

Abstract translation: 通过使用最小二乘法最小化概念，可以从容易获得的调制解调器数据确定环路长度，桥接抽头的数量和传输线路上的桥接抽头的长度。 特别地，可以通过将传输线的测量的频域信道脉冲响应与由多个部分和多个桥接抽头组成的环路的模型进行比较来估计环路长度，桥接抽头的数量和桥接抽头的长度 。

公开(公告)号：US08009825B2

公开(公告)日：2011-08-30

申请号：US12235659

申请日：2008-09-23

Applicant: Ludo Malfait ,  Paul Barrett ,  Andrew Whitefield

Inventor： Ludo Malfait ,  Paul Barrett ,  Andrew Whitefield

IPC: H04M9/00

CPC classification number: H04B3/493

Abstract: The present invention relates to detection of echo in telecommunications networks. The invention provides a method of echo detection comprising the steps of: generating a series of inbound vectors for an inbound signal; generating a series of outbound vectors for an outbound signal; repeating a predetermined number of comparison steps comprising the sub-steps of selecting an outbound vector from the outbound vectors; selecting an inbound vector from the inbound vectors; comparing said outbound vector with said inbound vector and with successive inbound vectors to generate a plurality of similarity metrics; and determining a relative position of the compared outbound vector having maximum correlation with said inbound vector; and counting the number of times each relative position is determined to be the position of maximum correlation.

Abstract translation: 本发明涉及电信网络中回波的检测。 本发明提供了一种回波检测方法，包括以下步骤：产生入站信号的一系列入站向量; 为出站信号生成一系列出站向量; 重复预定数量的比较步骤，包括从出站向量中选择出站向量的子步骤; 从入站向量中选择入站向量; 将所述出站向量与所述入站向量和连续的入站向量进行比较以生成多个相似性度量; 以及确定与所述入站向量具有最大相关性的所述比较出站向量的相对位置; 并计算每个相对位置被确定为最大相关位置的次数。

公开(公告)号：US20110007789A1

公开(公告)日：2011-01-13

申请号：US12885179

申请日：2010-09-17

Applicant: Jan D. Garmany

Inventor： Jan D. Garmany

IPC: H04B17/00

CPC classification number: H04B3/235 ,  H04B3/493 ,  H04L25/022 ,  H04L25/0228 ,  H04L25/03159 ,  H04L25/03828 ,  H04L27/06 ,  H04L27/2613 ,  H04L27/2662 ,  H04L27/2695 ,  H04L2025/03414

Abstract: A system and method for identifying minor echoes present in an input signal in the situation where a set of major echoes has already been identified from the input signal. The method includes: computing a spectrum F corresponding to a sum of the major echoes; computing a weighted power spectrum SM of the spectrum F; subtracting the weighted power spectrum SM from a weighted power spectrum PIN of the input signal to obtain a difference spectrum; performing a stabilized division of the difference spectrum by a conjugate of the spectrum F to obtain an intermediate spectrum; computing an inverse transform of the intermediate spectrum to obtain a time-domain signal; and estimating parameters one or more of the minor echoes from the time-domain signal. The echo parameters are usable to remove at least of portion of the one or more estimated minor echoes from the input signal.

Abstract translation: 在已经从输入信号识别出一组主要回波的情况下，用于识别存在于输入信号中的次要回波的系统和方法。 该方法包括：计算对应于主要回波和的频谱F; 计算光谱F的加权功率谱SM; 从输入信号的加权功率谱PIN中减去加权功率谱SM以获得差分频谱; 通过光谱F的共轭来执行差分光谱的稳定分割以获得中间光谱; 计算中间频谱的逆变换以获得时域信号; 以及从时域信号估计一个或多个次要回波的参数。 回波参数可用于从输入信号中去除一个或多个估计的次要回波的至少一部分。

公开(公告)号：US07835431B2

公开(公告)日：2010-11-16

申请号：US12694128

申请日：2010-01-26

Applicant: Murat Belge

Inventor： Murat Belge

IPC: H04B1/38 ,  H04L5/16

CPC classification number: H04B3/493 ,  H04B3/46 ,  H04L1/004 ,  H04L1/24 ,  H04L1/245 ,  H04L5/1438 ,  H04L25/0202 ,  H04L25/0216 ,  H04L43/50 ,  H04M3/085 ,  H04M3/2209 ,  H04M3/2227 ,  H04M3/306

Abstract: Through the use of a least squares minimization concept, the loop length, the number of bridged taps and length of the bridged taps on a transmission line can be determined from readily available modem data. In particular, the loop length, the number of bridge taps and the length of bridged taps can be estimated by comparing a measured frequency domain channel impulse response of the transmission line to a model of a loop that is comprised of multiple sections and multiple bridge taps.

公开(公告)号：US20100142602A1

公开(公告)日：2010-06-10

申请号：US12694128

申请日：2010-01-26

Applicant: Murat Belge

Inventor： Murat Belge

IPC: H04B1/38 ,  H04M1/24

CPC classification number: H04B3/493 ,  H04B3/46 ,  H04L1/004 ,  H04L1/24 ,  H04L1/245 ,  H04L5/1438 ,  H04L25/0202 ,  H04L25/0216 ,  H04L43/50 ,  H04M3/085 ,  H04M3/2209 ,  H04M3/2227 ,  H04M3/306

Abstract: Through the use of a least squares minimization concept, the loop length, the number of bridged taps and length of the bridged taps on a transmission line can be determined from readily available modem data. In particular, the loop length, the number of bridge taps and the length of bridged taps can be estimated by comparing a measured frequency domain channel impulse response of the transmission line to a model of a loop that is comprised of multiple sections and multiple bridge taps.

Abstract translation: 通过使用最小二乘法最小化概念，可以从容易获得的调制解调器数据确定环路长度，桥接抽头的数量和传输线路上的桥接抽头的长度。 特别地，可以通过将传输线的测量的频域信道脉冲响应与由多个部分和多个桥接抽头组成的环路的模型进行比较来估计环路长度，桥接抽头的数量和桥接抽头的长度 。

公开(公告)号：US20090080644A1

公开(公告)日：2009-03-26

申请号：US12235659

申请日：2008-09-23

Applicant: Ludo MALFAIT ,  Paul Barrett ,  Andrew Whitefield

Inventor： Ludo MALFAIT ,  Paul Barrett ,  Andrew Whitefield

IPC: H04M9/08

CPC classification number: H04B3/493

Abstract: The present invention relates to detection of echo in telecommunications networks. The invention provides a method of echo detection comprising the steps of: generating a series of inbound vectors for an inbound signal; generating a series of outbound vectors for an outbound signal; repeating a predetermined number of comparison steps comprising the sub-steps of selecting an outbound vector from the outbound vectors; selecting an inbound vector from the inbound vectors; comparing said outbound vector with said inbound vector and with successive inbound vectors to generate a plurality of similarity metrics; and determining a relative position of the compared outbound vector having maximum correlation with said inbound vector; and counting the number of times each relative position is determined to be the position of maximum correlation.

Abstract translation: 本发明涉及电信网络中回波的检测。 本发明提供了一种回波检测方法，包括以下步骤：产生入站信号的一系列入站向量; 生成出站信号的一系列出站向量; 重复预定数量的比较步骤，包括从出站向量中选择出站向量的子步骤; 从入站向量中选择入站向量; 将所述出站向量与所述入站向量和连续的入站向量进行比较以生成多个相似性度量; 以及确定与所述入站向量具有最大相关性的所述比较出站向量的相对位置; 并计算每个相对位置被确定为最大相关位置的次数。

公开(公告)号：US20080198942A1

公开(公告)日：2008-08-21

申请号：US12033792

申请日：2008-02-19

Applicant: Rama Akella ,  Roger Cheng

Inventor： Rama Akella ,  Roger Cheng

IPC: H04L27/28

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。