公开(公告)号：US6055268A

公开(公告)日：2000-04-25

申请号：US667267

申请日：1996-06-20

申请人： William C. Timm ,  Walter Y. Chen ,  Gene A. Frantz ,  Domingo G. Garcia ,  Xiaolin Lu ,  Dennis G. Mannering ,  Michael O. Polley ,  Terence J. Riley ,  Donald P. Shaver ,  Song Wu ,  Alan Gatherer ,  Paul E. Schurr ,  Douglas B. Weiner

发明人： William C. Timm ,  Walter Y. Chen ,  Gene A. Frantz ,  Domingo G. Garcia ,  Xiaolin Lu ,  Dennis G. Mannering ,  Michael O. Polley ,  Terence J. Riley ,  Donald P. Shaver ,  Song Wu ,  Alan Gatherer ,  Paul E. Schurr ,  Douglas B. Weiner

IPC分类号： H04L29/10 ,  H04J11/00 ,  H04L1/00 ,  H04L1/16 ,  H04L5/14 ,  H04L25/03 ,  H04L25/49 ,  H04L27/26 ,  H04M11/00 ,  H04M11/06 ,  H03H7/30 ,  H03H7/40 ,  H03K5/159

CPC分类号： H04L1/0023 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0016 ,  H04L25/03 ,  H04L25/03343 ,  H04L25/4921 ,  H04L27/2647 ,  H04L27/2649 ,  H04L27/2675 ,  H04L5/1438 ,  H04M11/06 ,  H04M11/062 ,  H04L1/0059 ,  H04L1/16 ,  H04L2025/03414 ,  H04L2025/03611 ,  Y02B60/31 ,  Y02B60/36

摘要： A modem communication system with receiving and transmission paths includes a direct equalizer system having an adaptive filter (1532) in the transmission path to compensate for frequency distortion of the communication channel. The transmitter filter coefficients are adapted by a filter coefficient calculator (1528), under control of a data detector (1526) which detects incoming data in the receiving path. A switch (1534) is controlled by status of a transmit output data buffer to multiplex either the training sequence or output data into the transmission path. When the buffer is idle, the training sequence generator (1540) is linked to a digital-to-analog (D/A) converter (1536) and line driver (1538). The receiving path includes an isolation switch (1520), a receiver amplifier (1522) and a slicer (1524). The receiver correlates the received training sequence with a known training sequence and updates the equalizer filter coefficients using an adaptation algorithm, such as a least mean squared algorithm. A first embodiment utilizes a high speed digital programmable filter (1532). Another embodiment utilizes a data buffer (1533) which is periodically filled with data filtered by a digital signal processor (DSP).

摘要翻译： 具有接收和传输路径的调制解调器通信系统包括在传输路径中具有自适应滤波器（1532）的直接均衡器系统，以补偿通信信道的频率失真。 在由检测接收路径中的输入数据的数据检测器（1526）的控制下，发射机滤波器系数由滤波器系数计算器（1528）适配。 开关（1534）由发送输出数据缓冲器的状态控制，以将训练序列或输出数据复用到传输路径中。 当缓冲器空闲时，训练序列发生器（1540）链接到数模（D / A）转换器（1536）和线驱动器（1538）。 接收路径包括隔离开关（1520），接收放大器（1522）和限幅器（1524）。 接收器将接收到的训练序列与已知的训练序列进行相关，并使用诸如最小均方算法的自适应算法来更新均衡器滤波器系数。 第一实施例利用高速数字可编程滤波器（1532）。 另一个实施例利用周期性地填充由数字信号处理器（DSP）滤波的数据的数据缓冲器（1533）。

公开(公告)号：US06522730B1

公开(公告)日：2003-02-18

申请号：US09232305

申请日：1999-01-15

申请人： William C. Timm ,  Terence J. Riley ,  Michael O. Polley ,  Gregory L. Waters

发明人： William C. Timm ,  Terence J. Riley ,  Michael O. Polley ,  Gregory L. Waters

IPC分类号： H04M1100

CPC分类号： H04M11/062

摘要： A telecommunications system using DSL modems (36, 38) detects on-hook or off-hook states of a local loop telecommunications line (18). If the local loop (18) is in an off-hook state, the normal data communication rates are used. If the local loop is in an on-hook state, the unused voice band is allocated to either the upstream band and/or downstream band of the DSL modems, in order to increase data communication rates.

摘要翻译： 使用DSL调制解调器（36,38）的电信系统检测本地环路电信线路（18）的挂机或摘机状态。 如果本地环路（18）处于摘机状态，则使用正常的数据通信速率。 如果本地环路处于挂机状态，则将未使用的语音频带分配给DSL调制解调器的上行频带和/或下游频带，以便增加数据通信速率。

公开(公告)号：US5809069A

公开(公告)日：1998-09-15

申请号：US684356

申请日：1996-07-19

申请人： Michael O. Polley ,  Walter Y. Chen ,  Donald P. Shaver

发明人： Michael O. Polley ,  Walter Y. Chen ,  Donald P. Shaver

IPC分类号： H04L27/38 ,  H04B1/38

CPC分类号： H04L27/38

摘要： A frequency-domain CAP receiver is provided that reduces the number of operations required to demodulate a CAP signal. The frequency-domain CAP receiver provides computational advantages over an equivalent time-domain version as the filter length required in the receiver increases.

摘要翻译： 提供了一种频域CAP接收机，其减少了解调CAP信号所需的操作次数。 频域CAP接收机提供优于等效时域版本的计算优势，因为接收机所需的滤波器长度增加。

公开(公告)号：US5999563A

公开(公告)日：1999-12-07

申请号：US742066

申请日：1996-10-31

申请人： Michael O. Polley ,  Walter Y. Chen ,  Xiaolin Lu

发明人： Michael O. Polley ,  Walter Y. Chen ,  Xiaolin Lu

IPC分类号： H04L1/00 ,  H04L1/16 ,  H04L5/02 ,  H04L5/14 ,  H04L25/03 ,  H04L25/49 ,  H04L27/26 ,  H04M11/06 ,  H04B1/38 ,  H04L5/16

CPC分类号： H04M11/06 ,  H04L1/0003 ,  H04L25/03 ,  H04L25/03343 ,  H04L25/4921 ,  H04L27/2655 ,  H04L5/023 ,  H04L5/1438 ,  H04M11/062 ,  H04L2025/03414 ,  H04L2025/03611 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2675

摘要： A modem that operates selectively in the voice-band frequency band and at higher frequency bands is provided. This modem supports multiple line codes, like DMT and CAP.The modem uses a Digital Signal Processor (DSP), so that different existing ADSL line codes, such as Discrete MultiTone (DMT) and Carrierless AM/PM (CAP), can be implemented on the same hardware platform. The modem negotiates in real-time, for a desired line transmission rate to accommodate line condition and service-cost requirement.The line code and rate negotiation process may be implemented at the beginning of each communication session through the exchange of tones between the modems. A four-step MDSL modem initialization process is provided for line code and rate compatibility.

摘要翻译： 提供了在语音频带和更高频带中有选择地操作的调制解调器。 该调制解调器支持多种线路代码，如DMT和CAP。 调制解调器使用数字信号处理器（DSP），因此可以在相同的硬件平台上实现不同的现有ADSL线路码，如离散多音（DMT）和无载波AM / PM（CAP）。 调制解调器实时协商，达到所需的线路传输速率，以适应线路状况和服务成本要求。 线路码和速率协商过程可以在每个通信会话开始时通过调制解调器之间的音调交换来实现。 提供了四步MDSL调制解调器初始化过程，用于线路代码和速率兼容性。

公开(公告)号：US06370188B1

公开(公告)日：2002-04-09

申请号：US09282403

申请日：1999-03-31

申请人： Song Wu ,  Domingo G. Garcia ,  Michael O. Polley

发明人： Song Wu ,  Domingo G. Garcia ,  Michael O. Polley

IPC分类号： H04B138

CPC分类号： H04L27/2675 ,  H04L27/2657

摘要： A modem (55) including receive circuitry (30) implemented by way of a digital signal processor (32, 32′) is disclosed. The receive circuitry (30) operates according to a receive clock (CLKr) that is based upon the output of a free run oscillator (50). An incoming frequency multiplexed signal (f(t)) is sampled by an analog-to-digital converter (31) and demodulated by way of a Fast Fourier Transform function (36). After such demodulation, a phase rotation function (40) applies a phase shift to the demodulated signal corresponding to an estimated phase offset (&tgr;) between the receive clock (CLKr) and a pilot signal (P) transmitted by the transmitting modem; a finite impulse response filter function (42) applies a digital filter to the demodulated signal to correct for phase error based upon an estimated frequency offset (&Dgr;). According to another disclosed embodiment, a pre-emphasis FIR filter function (52) and a pre-emphasis phase rotation function (54) are applied to an upstream singal, based upon the estimated phase offset (&eegr;) and frequency offset (&Dgr;).

摘要翻译： 公开了一种包括通过数字信号处理器（32,32'）实现的接收电路（30）的调制解调器（55）。 接收电路（30）根据基于自由运行振荡器（50）的输出的接收时钟（CLKr）进行操作。 输入频率复用信号（f（t））由模拟 - 数字转换器（31）采样，并通过快速傅里叶变换功能（36）进行解调。 在这样的解调之后，相位旋转功能（40）对与由发送调制解调器发送的接收时钟（CLKr）和导频信号（P）之间的估计相位偏移（＆amp; tgr）相对应的解调信号施加相移; 有限脉冲响应滤波器函数（42）将数字滤波器应用于解调信号，以基于估计的频率偏移（DELTA）校正相位误差。 根据另一公开的实施例，基于估计的相位偏移（eta）和频率偏移（DELTA），将预加重FIR滤波器函数（52）和预加重相位旋转函数（54）应用于上行奇偶校验。

公开(公告)号：US08040986B2

公开(公告)日：2011-10-18

申请号：US10723215

申请日：2003-11-26

申请人： Michael O. Polley ,  Donald P. Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Z. Ikram ,  Anand Dabak

发明人： Michael O. Polley ,  Donald P. Shaver ,  Srinath Hosur ,  Eko Onggosanusi ,  Muhammad Z. Ikram ,  Anand Dabak

IPC分类号： H04B7/10 ,  H04L1/02

CPC分类号： H04W52/42

摘要： A system comprises a wireless device that communicates across a spectrum having a plurality of sub-channels. The wireless device comprises a plurality of antennas through which the wireless device communicates with another wireless device, wherein each antenna communicates with the other wireless device via an associated communication pathway. The wireless device further comprises sub-channel power analysis logic coupled to the antennas and adapted to determine which communication pathway has the highest communication quality on a sub-channel by sub-channel basis. The wireless device still further comprises diversity selection logic coupled to the sub-channel power analysis logic and adapted to determine a weighting vector for an associated antenna based on the communication quality, wherein the weighting vector specifies a relative transmission power for each sub-channel for the associated antenna.

摘要翻译： 系统包括在具有多个子信道的频谱上进行通信的无线设备。 无线设备包括多个天线，无线设备通过该天线与另一无线设备通信，其中每个天线经由相关联的通信路径与另一无线设备通信。 无线设备还包括耦合到天线的子信道功率分析逻辑，并且适于通过子信道来确定子信道上哪个通信路径具有最高通信质量。 无线设备还包括耦合到子信道功率分析逻辑的分集选择逻辑，并且适于基于通信质量来确定相关天线的加权向量，其中加权向量规定每个子信道的相对发射功率，用于 相关天线。

公开(公告)号：US06954505B2

公开(公告)日：2005-10-11

申请号：US10034951

申请日：2001-12-27

申请人： Alan Gatherer ,  Michael O. Polley ,  Arthur J. Redfern

发明人： Alan Gatherer ,  Michael O. Polley ,  Arthur J. Redfern

IPC分类号： H04J11/00 ,  G06Q30/02 ,  H04L27/26 ,  H04B1/10

CPC分类号： G06Q30/02 ,  H04L27/2623

摘要： A transceiver (100) such as used in Discrete Multitone (DMT) modulation of digital signals for communication, such as in a DSL modem communications system, is described. The transceiver (100) includes a function (119) by way of which unloaded subchannels are encoded with a clip prevention signal. The clip prevention signal is derived to avoid clipping by an amplifier (18) after modulation into the time domain, upsampling, and filtering. The effects of the upsampling and filtering are considered in deriving the clip prevention signal, by considering the upsampling and filtering as a polyphase combination, and using the filter response for each phase. Frequency domain and time domain update alternatives are disclosed.

摘要翻译： 描述了诸如在DSL调制解调器通信系统中用于通信的数字信号的离散多音（DMT）调制中的收发器（100）。 收发器（100）包括功能（119），通过该功能，通过剪辑防止信号对未加载的子信道进行编码。 导出剪辑防止信号，以避免在调制到时域之后由放大器（18）进行削波，上采样和滤波。 通过考虑上采样和滤波作为多相组合，并且对每个相位使用滤波器响应，在推导剪辑防止信号时考虑上采样和滤波的影响。 公开了频域和时域更新的替代方案。

公开(公告)号：US06201830B1

公开(公告)日：2001-03-13

申请号：US09096061

申请日：1998-06-11

申请人： Adam M. Chellali ,  Michael O. Polley ,  Alan Gatherer

发明人： Adam M. Chellali ,  Michael O. Polley ,  Alan Gatherer

IPC分类号： H04B138

CPC分类号： H04L1/0071 ,  H04L5/06

摘要： A method is described for reducing computational requirements during idle transmission in remote access systems incorporating digital subscriber line (DSL) modems, including asymmetrical DSL (ADSL) systems. Processing power is saved during idle transmission by generating an idle signal using low-complexity techniques. The generated idle signal is made spectrally compatible with xDSL systems, and a non-disruptive signaling scheme is used to indicate to the far-end receiver the transition between idle to active or active to idle status. A technique is presented that modulates the phase of the pilot tone to signal status transitions to the remote receiver. The computational complexity at the receiver is reduced because fill demodulation and decoding is not required to determine that an idle signal is being transmitted.

摘要翻译： 描述了一种用于在包括数字用户线（DSL）调制解调器的远程接入系统中的空闲传输期间减少计算需求的方法，包括不对称DSL（ADSL）系统。 通过使用低复杂度技术生成空闲信号，在空闲传输期间节省处理能力。 所产生的空闲信号与xDSL系统进行频谱兼容，并且使用非中断信令方案向远端接收机指示空闲到活动或主动到空闲状态之间的转换。 提出了一种技术，其调制导频音的相位以将状态转换为远程接收器。 由于不需要填充解调和解码来确定正在发送空闲信号，所以接收机的计算复杂度降低。

公开(公告)号：US07161978B2

公开(公告)日：2007-01-09

申请号：US10038784

申请日：2001-12-31

申请人： Xiaolin Lu ,  Ping Tao ,  Michael O. Polley

发明人： Xiaolin Lu ,  Ping Tao ,  Michael O. Polley

IPC分类号： H04B1/38

CPC分类号： H04L49/90

摘要： A system for synchronizing sender sliding windows and receiver sliding windows employed in wireless packet communication is provided. The sender sliding window buffers outgoing packets to be sent to a receiver that employs a receiver sliding window to buffer incoming packets. A sender window manager manages the sender sliding window through positive acknowledgement, negative acknowledgement and/or timeout processing to facilitate synchronizing the sender sliding window with the receiver sliding window without employing synchronization messages or master/slave control. Similarly, a receiver window manager manages the receiver sliding window through sequence number analysis to facilitate synchronizing the receiver sliding window with the sender sliding window without employing synchronization messages or master/slave control.

摘要翻译： 提供了一种用于同步无线分组通信中使用的发送器滑动窗口和接收器滑动窗口的系统。 发送者滑动窗口缓冲要发送到使用接收器滑动窗口缓冲传入数据包的接收器的输出数据包。 发送者窗口管理器通过肯定确认，否定确认和/或超时处理来管理发送者滑动窗口，以便于不使用同步消息或主/从控制同步发送者滑动窗口与接收器滑动窗口。 类似地，接收机窗口管理器通过序列号分析来管理接收器滑动窗口，以便于使接收器滑动窗口与发送者滑动窗口同步而不使用同步消息或主/从控制。

公开(公告)号：US07120854B2

公开(公告)日：2006-10-10

申请号：US10643119

申请日：2003-08-18

申请人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael O. Polley

发明人： Xiaolin Lu ,  Srinath Hosur ,  Manish Goel ,  Michael O. Polley

IPC分类号： H03M13/00 ,  H04L5/16

CPC分类号： H04W56/009 ,  H04L7/048 ,  H04L7/10 ,  H04W24/00 ,  H04W74/00

摘要： A resynchronization method for use in a data communication system having a first device configured to transmit data at a symbol rate to a second device. The second device includes a Reed Solomon (RS) decoder having a RS lock indicator and a Moving Picture Experts Group (MPEG) Protocol Interface (MPI) having a MPI lock indicator, wherein the RS and the MPI lock indicators are monitored. Four different states, defined by the values of the RS and MPI lock indicators, determine whether the data communication system will wait for the RS decoder and the MPI hardware block to resynchronize, whether an intermediate-subset of the channel acquisition algorithm is performed or whether the entire channel acquisition algorithm is performed. The method for resynchronization described herein recovers synchronization within a predetermined time without the layers above the physical link layer having knowledge.

摘要翻译： 一种用于具有第一设备的数据通信系统中的再同步方法，该第一设备被配置为以符号速率向第二设备发送数据。 第二装置包括具有RS锁定指示器的里德所罗门（RS）解码器和具有MPI锁定指示器的运动图像专家组（MPEG）协议接口（MPI），其中监测RS和MPI锁定指示符。 由RS和MPI锁指示符的值定义的四种不同状态确定数据通信系统是否将等待RS解码器和MPI硬件块重新同步，无论是执行信道获取算法的中间子集还是执行 执行整个信道获取算法。 本文所述的用于重新同步的方法在预定时间内恢复同步，而不具有物理链路层之上的层具有知识。