公开(公告)号：US07577084B2

公开(公告)日：2009-08-18

申请号：US10836954

申请日：2004-04-30

申请人： Xiangguo Tang ,  Guozhu Long ,  Amir H. Fazlollahi

发明人： Xiangguo Tang ,  Guozhu Long ,  Amir H. Fazlollahi

IPC分类号： H04J1/12

CPC分类号： H04B3/21 ,  H04M3/304 ,  H04M3/34

摘要： To reduce the ISDN crosstalk in an incoming DSL signal, a crosstalk canceller observes at least a portion of the crosstalk signal and reproduces an estimate of the crosstalk signal for at least a portion of that signal within the DSL band. The crosstalk canceller applies a canceling signal based on the estimated crosstalk signal to reduce the crosstalk in the received DSL signal.

摘要翻译： 为了减少输入DSL信号中的ISDN串扰，串扰消除器观察串扰信号的至少一部分，并再现DSL带内该信号的至少一部分的串扰信号的估计。 串扰消除器基于估计的串扰信号来应用消除信号，以减少所接收的DSL信号中的串扰。

公开(公告)号：US07376157B1

公开(公告)日：2008-05-20

申请号：US10187384

申请日：2002-06-28

申请人： Amir Fazlollahi ,  Guozhu Long

发明人： Amir Fazlollahi ,  Guozhu Long

IPC分类号： H04J3/06

CPC分类号： H04L27/2613 ,  H04J3/0617 ,  H04L27/2656 ,  H04L27/2657 ,  H04Q2213/13039 ,  H04Q2213/1319 ,  H04Q2213/13302 ,  H04Q2213/13305 ,  H04Q2213/1336

摘要： Techniques for establishing TTR indication in ADSL Annex C based communication systems are disclosed. The techniques enable, for example, hyperframe alignment and synchronized initialization procedures (e.g., G.hs).

摘要翻译： 公开了在ADSL附件C通信系统中建立TTR指示的技术。 该技术例如能够实现超帧对准和同步初始化过程（例如，G.hs）。

公开(公告)号：US07180936B1

公开(公告)日：2007-02-20

申请号：US09810422

申请日：2001-03-15

申请人： Guozhu Long ,  Syed Abbas

发明人： Guozhu Long ,  Syed Abbas

IPC分类号： H04B1/38

CPC分类号： H04L5/1438 ,  H04L67/14 ,  H04L69/24 ,  H04L69/40

摘要： A method for preventing false starts during a handshake session involves the use of service identifiers for modem devices. The identifications are provided to one another for subsequent communication. To commence communications, a local device generates a request signal to initiate a handshake session. The request signal includes an identification unique to the remote device. The remote device receives the request and verifies the identification. The remote device then sends a response, which may optionally include an identification unique to the local device. The local device receives the response and verifies the identification before completing the handshake session.

摘要翻译： 在握手会话期间防止错误启动的方法包括使用调制解调器设备的服务标识符。 标识被提供给彼此进行后续的通信。 为了开始通信，本地设备产生请求信号以发起握手会话。 请求信号包括远程设备唯一的标识。 远程设备接收请求并验证该标识。 然后，远程设备发送响应，其可以可选地包括本地设备唯一的标识。 在完成握手会话之前，本地设备接收到响应并验证该标识。

公开(公告)号：US20070019538A1

公开(公告)日：2007-01-25

申请号：US11458340

申请日：2006-07-18

申请人： Guozhu Long ,  Yu-Wen Chang

发明人： Guozhu Long ,  Yu-Wen Chang

IPC分类号： H04J11/00

CPC分类号： H04L27/2662 ,  H04L27/2605 ,  H04L27/2607 ,  H04L27/2678

摘要： Symbol synchronization in a communication system is carried out as follows. A plurality of symbols corresponding to a transmitted signal is received, where the plurality of symbols include guard intervals. Peak correlation is obtained using the plurality of received symbols. The second derivative of the peak correlation is obtained, and one or more peaks within a corresponding guard interval are identified from the second derivative. A symbol start time for each received symbol is estimated based on the second derivative of the peak correlation.

摘要翻译： 通信系统中的符号同步如下进行。 接收对应于发送信号的多个符号，其中多个符号包括保护间隔。 使用多个接收到的符号获得峰值相关性。 获得峰值相关的二阶导数，并从二阶导数中识别相应保护间隔内的一个或多个峰值。 基于峰值相关的二阶导数来估计每个接收符号的符号开始时间。

公开(公告)号：US07058152B2

公开(公告)日：2006-06-06

申请号：US10827800

申请日：2004-04-19

申请人： Guozhu Long ,  Chin N Hung ,  Yaron Bar-Ness

发明人： Guozhu Long ,  Chin N Hung ,  Yaron Bar-Ness

IPC分类号： H04L25/10 ,  H04L25/49

CPC分类号： H04L5/1492 ,  H04L27/2662 ,  H04L27/2679

摘要： A system used to synchronize the clock frequency of a receiver with that of a transmitter, where both the receiver and transmitter communicate using the ADSL Annex C standard. The transmitter continuously transmits pilot tones to the receiver. The receiver determines the phase error between sequential pilot tone symbols to determine a phase error. The receiver uses the phase error to adjust the receiver clock frequency. However, if the most recently received symbol is subject to near end crosstalk or is subject to far end crosstalk and is a boundary symbol, the receiver ignores the phase error and does not adjust the receiver clock frequency.

摘要翻译： 用于使接收机的时钟频率与发射机的时钟频率同步的系统，其中接收机和发射机都使用ADSL附件C标准进行通信。 发射机连续向接收机发送导频音。 接收机确定顺序导频音符号之间的相位误差，以确定相位误差。 接收机使用相位误差来调整接收机时钟频率。 然而，如果最近接收到的符号经受近端串扰或受到远端串扰，并且是边界符号，则接收机忽略相位误差，并且不调整接收机时钟频率。

公开(公告)号：US06236714B1

公开(公告)日：2001-05-22

申请号：US09346781

申请日：1999-07-07

申请人： Qingyi Zheng ,  Guozhu Long

发明人： Qingyi Zheng ,  Guozhu Long

IPC分类号： H04M124

CPC分类号： H04M11/062 ,  H04B3/46

摘要： A Digital Subscriber Line (DSL) modem determines the proper transnit power level in a splitterless environment by transmitting a probe signal at different power levels to a telephone set and measuring the distortion signal reflected from the telephone set for each power level. The proper transmit power level is determined by detecting the “comer point” of the reflected distortion signal.

摘要翻译： 数字用户线路（DSL）调制解调器通过将不同功率电平的探测信号发射到电话机并测量从电话机反射的每个功率电平的失真信号，来确定无分路器环境中的适当的跨频功率电平。 通过检测反射失真信号的“角点”来确定适当的发射功率电平。

公开(公告)号：US6134265A

公开(公告)日：2000-10-17

申请号：US775769

申请日：1996-12-31

申请人： Guozhu Long

发明人： Guozhu Long

IPC分类号： H04L25/03 ,  H04B1/38

CPC分类号： H04L25/03343 ,  H04L25/03012 ,  H04L2025/03477 ,  H04L2025/03617 ,  H04L2025/03808

摘要： A V.34 compliant modem uses a noise whitening filter to compensate for noise enhancement in an equalizer. The noise whitening filter uses a 3 tap FIR the response of which is determined by 3 coefficients. The coefficients are derived using a newly developed extension of the Levinson-Durbin algorithm to complex numbers. The coefficients thus derived are used to control the precoder as well as the noise whitening filter. The coefficients are also used to control precoding reconstruction after the decoder.

摘要翻译： V.34兼容调制解调器使用噪声白化滤波器来补偿均衡器中的噪声增强。 噪声白化滤波器使用3抽头FIR，其响应由3个系数确定。 系数是使用新开发的Levinson-Durbin算法扩展到复数得到的。 由此导出的系数用于控制预编码器以及噪声白化滤波器。 系数也用于在解码器之后控制预编码重构。

公开(公告)号：US5991311A

公开(公告)日：1999-11-23

申请号：US958763

申请日：1997-10-25

申请人： Guozhu Long ,  Anthony J. P. O'Toole

发明人： Guozhu Long ,  Anthony J. P. O'Toole

IPC分类号： H04M1/00 ,  H04B3/32 ,  H04J3/00 ,  H04L5/02 ,  H04L5/14 ,  H04M1/253 ,  H04M11/00 ,  H04Q3/42 ,  H04Q11/04 ,  H04J3/12

CPC分类号： H04L5/1484 ,  H04L5/023 ,  H04L5/143 ,  H04Q11/0435

摘要： Pulp-insulated telephone cables common in Japan and other countries have higher cross-talk interference than plastic-insulated cables common in the United States. Deployment of newer xDSL systems in Japan has been limited by the high cross-talk interference in those pulp cables, especially the near-end cross-talk (NEXT) from ISDN services using time-compression multiplexing (TCM). A TCM-DSL that can share pulp-cable bundles with TCM ISDN lines eliminates the NEXT interference by synchronizing transmission and reception with the TCM ISDN equipment for the same cable bundle. The TCM-DSL line uses TCM that is synchronized with the ISDN transmit and receive windows so that the TCM-DSL is transmitting but not receiving when the ISDN modems at the same side are transmitting. When ISDN at the same side are receiving and not transmitting, NEXT interference does not exist. Thus higher-speed TCM-DSL data can be received during the ISDN receive windows with reduced interference. A passband modulation technique such as Carrierless-amplitude/phase modulation (CAP) with advanced signal processing techniques such as trellis encoding and pre-coding achieve higher data rates for TCM-DSL. The TCM-DSL transmitted signal occupies a pass-band that is separate from a low-frequency POTS band for voice-band services. The voice calls use full-duplex continuously without regard to the TCM-DSL data transmitted simultaneously with the POTS voice calls over the same phone line. TCM-DSL is synchronized to an ISDN clock that is routed to the TCM-DSL line card, or a burst-timing extractor that detects burst timing from either the ISDN line signal or cross-talk from the ISDN line signals.

摘要翻译： 在日本和其他国家普遍使用的纸浆绝缘电话电缆比美国常见的塑料绝缘电缆具有更高的串扰干扰。 日本更新的xDSL系统的部署受到这些纸浆电缆的高串扰干扰，特别是使用时间压缩复用（TCM）的ISDN业务的近端串扰（NEXT）的限制。 可以与TCM ISDN线路共享纸浆电缆束的TCM-DSL通过与同一电缆束的TCM ISDN设备同步传输和接收来消除NEXT干扰。 TCM-DSL线路使用与ISDN发送和接收窗口同步的TCM，以便当同一侧的ISDN调制解调器正在发送时，TCM-DSL正在发送但不接收。 当ISDN在同一侧正在接收而不发送时，不存在NEXT干扰。 因此，可以在减少干扰的ISDN接收窗口期间接收更高速度的TCM-DSL数据。 通过诸如网格编码和预编码等先进的信号处理技术的诸如无载波幅度/相位调制（CAP）的通带调制技术为TCM-DSL实现更高的数据速率。 TCM-DSL发送信号占用与用于语音频带业务的低频POTS频带分离的通带。 语音呼叫连续使用全双工，而不考虑通过同一电话线与POTS语音呼叫同时发送的TCM-DSL数据。 TCM-DSL与路由到TCM-DSL线路卡的ISDN时钟同步，或从ISDN线路信号或ISDN线路信号的串扰检测突发定时的脉冲串定时提取器。

公开(公告)号：US5943365A

公开(公告)日：1999-08-24

申请号：US746356

申请日：1996-11-08

申请人： Guozhu Long ,  Gunnar Holm

发明人： Guozhu Long ,  Gunnar Holm

IPC分类号： H04L25/49 ,  H04B1/38 ,  H04L27/00

CPC分类号： H04L25/4927

摘要： Modem technology is implemented in a system including a personal computer (PC) to enable communication over a PSTN using communication software which includes a DC and near-DC signal suppresser.

摘要翻译： 调制解调器技术在包括个人计算机（PC）的系统中实现，以通过使用包括DC和近DC信号抑制器的通信软件通过PSTN进行通信。

公开(公告)号：US5406552A

公开(公告)日：1995-04-11

申请号：US181278

申请日：1994-01-13

申请人： Guozhu Long ,  Fuyun Ling ,  M. Vedat Eyuboglu

发明人： Guozhu Long ,  Fuyun Ling ,  M. Vedat Eyuboglu

IPC分类号： H04B3/23 ,  H04M1/00

CPC分类号： H04B3/235 ,  H04B3/232

摘要： A device and method utilize a linear feedback/feedforward configuration to estimate and cancel a listener echo wherein equalizer (202) and listener echo cancellation (204 and 208) units are jointly updated, allowing determination of an error signal (204 and 208), in place of the former method of separate error signal determination for each of an equalizer and a listener echo canceller. An improved phase-correction scheme is utilized to compensate the frequency offset in the listener echo. The relationship between the listener echo and talker far echo is utilized to facilitate the listener echo cancellation.

摘要翻译： 设备和方法利用线性反馈/前馈配置来估计和消除收听者回声，其中均衡器（202）和收听者回声消除（204和208）单元被联合更新，允许确定误差信号（204和208） 对于均衡器和收听回波消除器中的每一个，单独的误差信号确定的前一种方法的位置。 利用改进的相位校正方案来补偿收听者回波中的频率偏移。 听众回声和讲话者远端回声之间的关系被用来促进听众回声消除。