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1. 发明授权

US06351487B1 Digital subscriber line device driver using communication window size based on relative data rates of upstream and downstream communications 有权
标题翻译：基于上行和下行通信的相对数据速率的通信窗口尺寸的数字用户线路设备驱动器
公开(公告)号：US06351487B1
公开(公告)日：2002-02-26
申请号：US09156296
申请日：1998-09-17
申请人： Xiaolin Lu , Dennis G. Mannering
发明人： Xiaolin Lu , Dennis G. Mannering
IPC分类号： H04B346
CPC分类号： H04L12/66
摘要： A computer system (12) comprising a first DSL modem (M12) for communicating data packets (MG1, MG2, MG3) with a second DSL modem (M14) after a connection is established between the first DSL modem and the second DSL modem. The data packets are for communication from the first DSL modem to the second DSL modem at a downstream communications rate and for communication from the second DSL modem to the first DSL modem at an upstream communications rate. The computer system further comprises a memory (MEM12) operable to store a computer program (60), where in one embodiment this computer program is an operating system. The computer program is operable to require a data parameter indicating a number of data packets which may be communicated in an instance from the computer program to the first DSL modem for communication to the second DSL modem. Lastly, the computer system further comprises a field (e.g., SendWindow field) for providing the data parameter to the computer program, wherein the number is responsive to the ratio of the downstream communications rate relative to the upstream communications rate.
摘要翻译：一种计算机系统（12），包括在第一DSL调制解调器和第二DSL调制解调器之间建立连接之后，用于与第二DSL调制解调器（M14）通信数据分组（MG1，MG2，MG3）的第一DSL调制解调器（M12）。数据分组用于以下游通信速率从第一DSL调制解调器到第二DSL调制解调器的通信，以及用于以上游通信速率从第二DSL调制解调器到第一DSL调制解调器的通信。计算机系统还包括可操作以存储计算机程序（60）的存储器（MEM12），其中在一个实施例中，该计算机程序是操作系统。计算机程序可操作以要求指示可以从计算机程序到第一DSL调制解调器的实例中传送数据的数量的数据参数，用于与第二DSL调制解调器的通信。最后，计算机系统还包括用于向计算机程序提供数据参数的字段（例如，SendWindow字段），其中该数字响应于下行通信速率相对于上行通信速率的比率。

2. 发明授权

US6137839A Variable scaling of 16-bit fixed point fast fourier forward and inverse transforms to improve precision for implementation of discrete multitone for asymmetric digital subscriber loops 失效
标题翻译： 16位固定点快速傅立叶变换的正向变换和逆变换，以提高用于非对称数字用户环路的离散多音频实现的精度
公开(公告)号：US6137839A
公开(公告)日：2000-10-24
申请号：US742226
申请日：1996-10-31
申请人： Dennis G. Mannering , Alan Gatherer , Donald P. Shaver
发明人： Dennis G. Mannering , Alan Gatherer , Donald P. Shaver
IPC分类号： H04L1/00 , H04L1/16 , H04L5/02 , H04L5/14 , H04L25/03 , H04L25/49 , H04L27/26 , H04M11/06 , H04K1/10
CPC分类号： H04M11/062 , H04L1/0003 , H04L25/03 , H04L25/03343 , H04L25/4921 , H04L27/265 , H04L5/023 , H04L5/1438 , H04M11/06 , H04L2025/03414 , H04L2025/03611 , H04L27/2613 , H04L27/2655
摘要： A discrete multitone (DMT) digital subscriber loop (xDSL) telecommunication system has a transmitter portion including a bit encoder, inverse fast Fourier transform (FFT), parallel-to-serial converter, digital-to-analog converter and line driver for transmitting data signals to a twisted pair telephone line and a receiver portion including an analog-to-digital converter, serial-to-parallel converter, forward FFT and bit decoder for receiving data signals from the twisted pair telephone line. The FFT's are implemented in 19-bit precision using a fixed point 16-bit processor. At each FFT stage, the number of sign bits in the FFT input data is examined to determine whether overflow is possible during multiply and add operations. The input data is downscaled by right shifting one or two bits if overflow is possible. If downscaling occurred, the output data is rescaled after completion of the FFT operation. If overflow is not possible, no scaling is done. By using variable scaling to downscale only when necessary, better overall precision is maintained.
摘要翻译：离散多音（DMT）数字用户环路（xDSL）电信系统具有包括比特编码器，快速傅里叶逆变换（FFT），并行到串行转换器，数模转换器和用于发送数据的线路驱动器的发射机部分信号到双绞线电话线和包括模数转换器，串并转换器，正向FFT和位解码器的接收器部分，用于从双绞线电话线接收数据信号。 FFT使用固定点16位处理器以19位精度实现。在每个FFT阶段，检查FFT输入数据中的符号位的数量，以确定在乘法和加法运算期间是否可能溢出。如果可以溢出，则通过右移一位或两位来对输入数据进行缩减。如果发生降频，则在FFT操作完成后，输出数据重新定标。如果无法进行溢出，则不进行缩放。通过使用可变缩放来缩小尺寸，只有在必要时才能保持更好的整体精度。

3. 发明授权

US6055268A Multimode digital modem 失效
标题翻译：多模数字调制解调器
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）。

4. 发明授权

US07555049B2 Receiver-side selection of DSL communications mode 有权
标题翻译： DSL通信模式的接收方选择
公开(公告)号：US07555049B2
公开(公告)日：2009-06-30
申请号：US11220089
申请日：2005-09-06
申请人： Murtaza Ali , Shahedolla Molla , Narasimhan Venkatraman , Channamallesh Hiremath , Umashankar S. Iyer , Udayan Dasgupta , Austin Paul Hunt , Dennis G. Mannering
发明人： Murtaza Ali , Shahedolla Molla , Narasimhan Venkatraman , Channamallesh Hiremath , Umashankar S. Iyer , Udayan Dasgupta , Austin Paul Hunt , Dennis G. Mannering
IPC分类号： H04K1/10 , H04L27/28 , G06F15/16
CPC分类号： H04M11/062
摘要： A client premises digital subscriber line (DSL) modem having multi-mode capability is disclosed. In initialization, the modem estimates whether channel conditions are such that digital processing of the received data according to a lower data rate DSL standard, such as ADSL2, may result in a higher effective data rate than receipt and processing according to a higher data rate DSL standard, such as ADSL2+. If so, the DSL modem configures itself, such as by configuring its filter characteristics and sampling frequency, to receive and process data according to the lower data rate DSL standard; the transmitting modem, for example at a central office or service area interface, may continue to operate according to the higher data rate standard (with its bit loading corresponding to a subset of subchannels). The receiving DSL modem processes the payload data according to the lower standard, while processing control messages according to the higher standard.
摘要翻译：公开了具有多模式能力的客户端数字用户线（DSL）调制解调器。在初始化中，调制解调器估计信道条件是否使得根据诸如ADSL2的较低数据速率DSL标准的接收数据的数字处理可以导致比根据较高数据速率DSL的接收和处理更高的有效数据速率标准，如ADSL2 +。如果是这样，则DSL调制解调器通过配置其滤波器特性和采样频率来配置自身，以根据较低数据速率DSL标准接收和处理数据; 发射调制解调器例如在中心局或服务区接口处可以根据较高的数据速率标准（其位加载对应于子信道子集）继续运行。接收DSL调制解调器根据较低的标准处理有效载荷数据，同时根据较高的标准处理控制消息。

5. 发明授权

US06404804B1 Circuits, systems, and methods for error elimination in a digital subscriber line modem 失效
标题翻译：用于数字用户线路调制解调器中的消除电路的电路，系统和方法
公开(公告)号：US06404804B1
公开(公告)日：2002-06-11
申请号：US09109340
申请日：1998-06-30
申请人： Dennis G. Mannering , Song Wu
发明人： Dennis G. Mannering , Song Wu
IPC分类号： H04B138
CPC分类号： H04L1/0083 , H04L1/16 , H04L5/16
摘要： A method (50) of communicating bit groups between a first DSL modem (M14) and a second DSL modem (M12). The method receives (56) at the first DSL modem a plurality of bit groups (FF1-FF500) from the second DSL modem. Each of the plurality of bit groups comprises a plurality of bit sub-groups (W1-W12), and each of the plurality of bit sub-groups has an order of location. For each of the plurality of bit groups, the method determines (58) whether bits of at least one sub-group having a common order of location comprise at least one erroneous bit. In response to this determination, the method stores (62, 64) in the first DSL modem a record (InMaskBuff) of whether the at least one sub-group having the common order of location comprises at least one erroneous bit. From this record, various other steps (72) may be taken in the preferred embodiment, including suppressing (82) the at least one sub-group from communicating valid information from the second DSL modem to the first DSL modem.
摘要翻译：一种在第一DSL调制解调器（M14）和第二DSL调制解调器（M12）之间通信位组的方法（50）。该方法在第一DSL调制解调器处接收来自第二DSL调制解调器的多个位组（FF1-FF500）（56）。多个比特组中的每一个包括多个比特子组（W1-W12），并且多个比特子组中的每一个具有位置顺序。对于多个位组中的每一个，该方法确定（58）具有共同的位置顺序的至少一个子组的位是否包括至少一个错误位。响应于该确定，该方法在第一DSL调制解调器中存储（InMaskBuff）是否具有共同的位置顺序的至少一个子组包括至少一个错误位（62,64）。从该记录，可以在优选实施例中采用各种其他步骤（72），包括抑制（82）至少一个子组从第二DSL调制解调器向第一DSL调制解调器传送有效信息。

6. 发明授权

US6134273A Bit loading and rate adaptation on DMT DSL data transmission 失效
标题翻译： DMT DSL数据传输的位加载和速率调整
公开(公告)号：US6134273A
公开(公告)日：2000-10-17
申请号：US996731
申请日：1997-12-23
申请人： Song Wu , Yaqi Cheng , Dennis G. Mannering
发明人： Song Wu , Yaqi Cheng , Dennis G. Mannering
IPC分类号： H04L27/26 , H04K1/10 , H04L27/28
CPC分类号： H04L27/2608
摘要： A method to estimate the bit loading on each tone of a DMT digital subscriber loop system is disclosed. A generic bit-mapping table is given for different sizes of constellations to save memory space.
摘要翻译：公开了一种用于估计DMT数字用户环路系统的每个音调上的比特加载的方法。给出了不同大小星座的通用位映射表，以节省内存空间。

7. 发明授权

US06104749A Message frame and flow control in a digital subscriber line telecommunications system 失效
标题翻译：数字用户线电信系统中的消息帧和流控制
公开(公告)号：US06104749A
公开(公告)日：2000-08-15
申请号：US1055
申请日：1997-12-30
申请人： Xiaolin Lu , Dennis G. Mannering
发明人： Xiaolin Lu , Dennis G. Mannering
IPC分类号： H04L29/06 , H04L29/08 , H04M11/06 , H04B1/38
CPC分类号： H04M11/062 , H04L29/06 , H04L69/324
摘要： A method of communicating bit groups between a first DSL modem and a second DSL modem. The method receives at the first DSL modem a first bit group from the second DSL modem. The first bit group comprises a flow control bit in a fixed location within the first bit group. In response to the flow control bit being in a first state, the method transmits a second bit group from the first DSL modem to the second DSL modem, wherein the second bit group consists of filler data. In response to the flow control bit being in a second state, the method transmits a third bit group from the first DSL modem to the second DSL modem, wherein the third bit group comprises data other than filler data.
摘要翻译：一种在第一DSL调制解调器和第二DSL调制解调器之间通信位组的方法。该方法在第一DSL调制解调器处接收来自第二DSL调制解调器的第一位组。第一位组包括位于第一位组内的固定位置的流控制位。响应于流控制位处于第一状态，该方法将第二位组从第一DSL调制解调器发送到第二DSL调制解调器，其中第二位组由填充数据组成。响应于流控制位处于第二状态，该方法将第三位组从第一DSL调制解调器发送到第二DSL调制解调器，其中第三位组包括除填充数据以外的数据。

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