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70 条记录 (耗时 0.031 秒)

    Fast timing acquisition for partial-response signalling
    2.
    发明授权
    Fast timing acquisition for partial-response signalling 失效
    部分响应信号的快速定时采集

    公开(公告)号：US4890299A

    公开(公告)日：1989-12-26

    申请号：US237601

    申请日：1988-08-25

    申请人： Francois B. Dolivo ,  Gottfried Ungerboeck

    发明人： Francois B. Dolivo ,  Gottfried Ungerboeck

    IPC分类号： H04L25/40 ,  G11B20/10 ,  G11B20/14 ,  H04L7/02 ,  H04L7/04 ,  H04L7/10 ,  H04L25/34 ,  H04L25/49 ,  H04L25/497

    CPC分类号： H04L7/0062 ,  G11B20/10055 ,  G11B20/1403 ,  H04L25/4919 ,  H04L25/497 ,  H04L7/10 ,  H04L7/046

    摘要： An apparatus and a method for fast acquisition of the sample-timing phase in systems using partial-response signalling are disclosed. For fast initial adjustment of the timing phase, a known preamble is transmitted. During that phase, previous schemes could occasionally hang up for an extended period of time at the unstable equilibrium point halfway between the desired sampling times. The new procedure eliminates the hangup problem by introducing a hysteresis effect which greatly diminishes the probability of reversals in the once chosen direction of timing-phase adjustment. Thus, reliable adjustment of the timing phase with a much shorter preamble is achieved. The apparatus for furnishing a timing correction signal .DELTA..tau..sub.n includes a timing gradient generator portion (41) and a data sample reconstruction portion (43). The data sample reconstruction portion (43) develops a present reconstructed data sample x.sub.n from the present received signal sample y.sub.n and a previous reconstructed data sample. The output x.sub.n of the data sample reconstruction portion is delayed and furnished to the gradient generation portion (41) which also receives the present received signal sample y.sub.n and a delayed received signal sample, for generating the timing correction signal .DELTA..tau..sub.n.

    Low density parity check (LDPC) encoded higher order modulation
    4.
    发明授权
    Low density parity check (LDPC) encoded higher order modulation 失效
    低密度奇偶校验（LDPC）编码高阶调制

    公开(公告)号：US08503540B2

    公开(公告)日：2013-08-06

    申请号：US13620468

    申请日：2012-09-14

    申请人： Lin He ,  Thomas J. Kolze ,  Ba-Zhong Shen ,  Gottfried Ungerboeck ,  Bruce J. Currivan

    发明人： Lin He ,  Thomas J. Kolze ,  Ba-Zhong Shen ,  Gottfried Ungerboeck ,  Bruce J. Currivan

    IPC分类号： H04N7/12 ,  H04N11/02

    CPC分类号： H04L27/3416 ,  H03M13/253 ,  H04L1/0057 ,  H04L1/0065 ,  H04L27/36

    摘要： A method and apparatus is disclosed to map a sequence of data to Quadrature Amplitude Modulation (QAM) constellation symbols. The method and apparatus encodes only a portion of the sequence of data and leaves a remaining portion of the sequence of data unencoded. The encoded portion of the sequence of data and the remaining unencoded portion of the sequence of data are then mapped into modulation symbols of the QAM constellation. The encoded portion of the sequence of data selects subsets of the QAM constellation, and the remaining unencoded portion of the sequence of data determines a specific modulation symbol within each subset of the QAM constellation.

    摘要翻译： 公开了一种将数据序列映射到正交幅度调制（QAM）星座符号的方法和装置。 该方法和装置仅对该数据序列的一部分进行编码，并留下未被编码的数据序列的剩余部分。 然后将数据序列的编码部分和数据序列的剩余未编码部分映射到QAM星座图的调制符号中。 数据序列的编码部分选择QAM星座的子集，并且数据序列的剩余未编码部分确定QAM星座图的每个子集内的特定调制符号。

    Method and system for 10GBASE-T start-up
    5.
    发明授权
    Method and system for 10GBASE-T start-up 有权
    10GBASE-T启动的方法和系统

    公开(公告)号：US08437366B2

    公开(公告)日：2013-05-07

    申请号：US13099760

    申请日：2011-05-03

    申请人： Gottfried Ungerboeck ,  Scott Powell

    发明人： Gottfried Ungerboeck ,  Scott Powell

    IPC分类号： H04J3/00 ,  H04L12/26

    CPC分类号： H04L41/08 ,  H04L12/403

    摘要： Certain aspects for the start-up procedure of transceivers supporting higher data rates over twisted-pair copper cabling are provided for 10 Gbit/sec Ethernet links (10GBASE-T). During a PMA (physical medium attachment) training period of the start-up procedure, long PMA training frames are exchanged periodically between link partners. A significant portion of each PMA training frame consists of known pseudo random sequences simultaneously transmitted over four wire pairs. PMA training frames include an InfoField for exchanging parameters and control information between link partners. For example, the InfoField's payload comprises fields for indicating current transmit power backoff (PBO), next PBO, requested PBO, transition count, control information, and for communicating precoder coefficients. Information in InfoFields is repeated and is not necessary that a link partner decodes every InfoField. For example, by occasionally reading the transition count, a link partner can determine when a change in transmit PBO and/or a state transition is to occur.

    摘要翻译： 为10Gbit /秒以太网链路（10GBASE-T）提供了通过双绞铜缆布线支持更高数据速率的收发器的启动过程的某些方面。 在启动程序的PMA（物理介质附加）训练期间，长链PMA训练帧在链路伙伴之间定期交换。 每个PMA训练帧的重要部分由通过四个线对同时传输的已知伪随机序列组成。 PMA培训框架包括用于在链接伙伴之间交换参数和控制信息的InfoField。 例如，InfoField的有效载荷包括用于指示当前发送功率回退（PBO），下一个PBO，所请求的PBO，转移计数，控制信息以及用于传达预编码器系数的字段。 InfoFields中的信息被重复，链接伙伴不需要对每个InfoField进行解码。 例如，通过偶尔读取转换计数，链路伙伴可以确定何时发生传输PBO和/或状态转换的变化。

    System and method for Huffman shaping in a data communication system
    6.
    发明授权
    System and method for Huffman shaping in a data communication system 有权
    数据通信系统中霍夫曼整形的系统和方法

    公开(公告)号：US07460595B2

    公开(公告)日：2008-12-02

    申请号：US11188301

    申请日：2005-07-25

    申请人： Gottfried Ungerboeck ,  Arthur J. Carlson

    发明人： Gottfried Ungerboeck ,  Arthur J. Carlson

    IPC分类号： H04B1/66

    CPC分类号： H04L27/3405 ,  H03M7/40

    摘要： In a communication system, Huffman coding techniques are used to obtain shaping gains for an improvement in data transmission rates. More particularly, a novel method of Huffman shaping is described that achieves a shaping gain of greater than 1 dB. The shaping gain results in a higher data rate transmission in a communication system where transmitted power is constrained.

    摘要翻译： 在通信系统中，使用霍夫曼编码技术获得整形增益以提高数据传输速率。 更具体地，描述了一种实现霍夫曼整形的新方法，其实现了大于1dB的整形增益。 整形增益导致传输功率受限的通信系统中的较高数据速率传输。

    Subdimensional single-carrier modulation
    7.
    发明授权
    Subdimensional single-carrier modulation 有权
    次维单载波调制

    公开(公告)号：US07457364B2

    公开(公告)日：2008-11-25

    申请号：US10909661

    申请日：2004-08-02

    申请人： Gottfried Ungerboeck

    发明人： Gottfried Ungerboeck

    IPC分类号： H04L27/00

    CPC分类号： H04L25/03343 ,  H04L25/03038 ,  H04L25/49 ,  H04L27/3405 ,  H04L2025/03375 ,  H04L2025/03477

    摘要： A method for modulating a sequence of data symbols such that the transmit signal exhibits spectral redundancy. Null symbols are inserted in the sequence of data symbols such that a specified pattern of K data symbols and N−K null symbols is formed in every period of N symbols in the modulated sequence, N and K being positive integers and K being smaller than N.

    摘要翻译： 一种用于调制数据符号序列使得发送信号表现出频谱冗余的方法。 在数据符号序列中插入空符号，使得在调制序列中的N个符号的每个周期中形成K个数据符号和N-K个空符号的指定模式，N和K是正整数，K小于N.

    Cancellation of interference in a communication system with application to S-CDMA
    8.
    发明申请
    Cancellation of interference in a communication system with application to S-CDMA 有权
    消除应用于S-CDMA的通信系统中的干扰

    公开(公告)号：US20050141460A9

    公开(公告)日：2005-06-30

    申请号：US10142189

    申请日：2002-05-08

    申请人： Bruce Currivan ,  Thomas Kolze ,  Gottfried Ungerboeck ,  Nabil Yousef

    发明人： Bruce Currivan ,  Thomas Kolze ,  Gottfried Ungerboeck ,  Nabil Yousef

    IPC分类号： H04B1/707 ,  H04B7/216 ,  H04J13/00 ,  H04J13/16

    CPC分类号： H04B7/216 ,  H04B1/71 ,  H04B1/7102 ,  H04B1/7105 ,  H04B1/7107 ,  H04J13/0003 ,  H04J13/16

    摘要： Cancellation of interference in a communication system with application to S-CDMA. A relatively straight-forward implemented, and computationally efficient approach of selecting a predetermined number of unused codes is used to perform weighted linear combination selectively with each of the input spread signals in a multiple access communication system. If desired, the predetermined number of unused codes is always the same in each implementation. Alternatively, the predetermined number of unused codes are selected from within a reordered code matrix using knowledge that is shared between the two ends of a communication system, such as between the CMs and a CMTS. While the context of an S-CDMA communication system having CMs and a CMTS is used, the solution is generally applicable to any communication system that seeks to cancel narrowband interference. Several embodiments are also described that show the generic applicability of the solution across a wide variety of systems.

    摘要翻译： 消除应用于S-CDMA的通信系统中的干扰。 使用选择预定数量的未使用代码的相对简单的实现和计算上有效的方法来在多址通信系统中选择性地与每个输入扩展信号执行加权线性组合。 如果需要，在每个实现中，预定数量的未使用代码总是相同的。 或者，使用在诸如CM和CMTS之间的通信系统的两端之间共享的知识，从重排序代码矩阵中选择预定数量的未使用代码。 虽然使用具有CM和CMTS的S-CDMA通信系统的上下文，但该解决方案通常适用于试图取消窄带干扰的任何通信系统。 还描述了几个实施例，其显示了解决方案在各种系统上的通用适用性。

    Echo cancelling device providing adjustment of the echo canceller coefficients during full-duplex transmission
    9.
    发明授权
    Echo cancelling device providing adjustment of the echo canceller coefficients during full-duplex transmission 失效
    ECHO取消设备在全双工传输期间提供ECHO CANCELLER系统的调整

    公开(公告)号：US5132963A

    公开(公告)日：1992-07-21

    申请号：US522333

    申请日：1990-05-11

    申请人： Gottfried Ungerboeck

    发明人： Gottfried Ungerboeck

    IPC分类号： H04B3/23

    CPC分类号： H04B3/23 ,  H04B3/237 ,  H04B3/238

    摘要： In the echo-cancelling device of the invention new decision-error directed algorithms are developed which permit to maintain adaptivity of the echo coefficients and perform precise tracking of the far-end echo phase in a computationally efficent manner during full-duplex operation. The echo-cancelling device comprises an adjust device (40) performing the minimization of the mean-square error obtained as the difference between the signal at the output of the equalizer (Z) and the data-symbol decision (a), for providing the adjustment of the near echo estimator (20) coefficients, of the far echo estimator (22) coefficients, and of the phase (26) of the estimated far echo.

    Microprocessor including means for concurrently copying ALU results into selected operand register subsets and at least one main memory locations
    10.
    发明授权
    Microprocessor including means for concurrently copying ALU results into selected operand register subsets and at least one main memory locations 失效
    微处理器包括用于同时将ALU结果复制到选择的操作数寄存器子集和至少一个主存储器位置的装置

    公开(公告)号：US4615004A

    公开(公告)日：1986-09-30

    申请号：US681047

    申请日：1984-12-13

    申请人： Pierre R. Chevillat ,  Hans P. Kaeser ,  Dietrich G. U. Maiwald ,  Gottfried Ungerboeck

    发明人： Pierre R. Chevillat ,  Hans P. Kaeser ,  Dietrich G. U. Maiwald ,  Gottfried Ungerboeck

    IPC分类号： G06F9/30 ,  G06F7/00 ,  G06F9/315 ,  G06F15/78 ,  G06F17/10 ,  G06F13/00

    CPC分类号： G06F9/30032 ,  G06F15/786

    摘要： A microprocessor having a single common data bus (17) to which the output (33) of the arithmetic-logic unit (11) as well as input and output of the data memory (13) are connected without intermediate buffer registers. Of the working registers (21, 23, 25, 27) connected to the ALU inputs, one group (21, 23) is loaded from the common data bus and the other group (25, 27), used as accumulators, is directly loaded from the ALU output. Specific control circuitry (51, 53, 55, 57, 59, 61) allows selective storing of ALU output values into accumulators (25, 27), and simultaneous transfer with selective scaling into another register and into an addressed memory location within the same cycle during which the instruction was executed.

    摘要翻译： 具有单个公共数据总线（17）的微处理器，算术逻辑单元（11）的输出（33）以及数据存储器（13）的输入和输出连接到其上，而没有中间缓冲寄存器。 在连接到ALU输入的工作寄存器（21,23,25,27）中，从公共数据总线加载一组（21,23），并且用作累加器的另一组（25,27）被直接加载 从ALU输出。 特定控制电路（51,53,55,57,59,61）允许将ALU输出值选择性地存储到累加器（25,27）中，并且通过选择性缩放同时传送到另一个寄存器并在同一周期内的寻址存储器位置 执行指令期间。