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132 条记录 (耗时 0.032 秒)

    Enhanced DOCSIS upstream channel changes
    81.
    发明授权
    Enhanced DOCSIS upstream channel changes 有权
    增强的DOCSIS上行通道更改

    公开(公告)号：US07359332B2

    公开(公告)日：2008-04-15

    申请号：US10139312

    申请日：2002-05-06

    申请人： Thomas J. Kolze ,  Bruce J. Currivan

    发明人： Thomas J. Kolze ,  Bruce J. Currivan

    IPC分类号： H04J3/26 ,  H04N7/173

    CPC分类号： H04N21/6118 ,  H04L65/4076 ,  H04N21/6168

    摘要： Enhanced DOCSIS upstream channel changes. A CMTS directs channel changing of a CM, sometimes between upstream data bursts. Logical channels, part of a single frequency channel, may be used, and the channel changing may be performed between those logical channels. Multiple upstream burst profiles and/or modulation densities may be used providing high degrees of robustness, fidelity, and throughput and allowing great channel flexibility. A CM may be switched between channels without losing transmitter capability. Even if some throughput rate may be sacrificed during the channel changing, the CM will still be able to continue data throughput. Then, the new channel may then undergo the initialization and ranging processes thereby enabling greater throughput on that new channel. After undergoing the initialization and ranging processes, the new channel will then be a fully equivalent member of the CM communication system.

    摘要翻译： 增强的DOCSIS上行通道更改。 CMTS指示CM的信道改变，有时在上行数据突发之间。 可以使用逻辑信道，即单个频率信道的一部分，并且可以在这些逻辑信道之间执行信道改变。 可以使用多个上游突发配置文件和/或调制密度，提供高度的鲁棒性，保真度和吞吐量，并且允许很大的信道灵活性。 可以在信道之间切换CM而不会丢失发射机能力。 即使在信道改变期间可能牺牲一些吞吐率，CM仍将能够继续数据吞吐量。 然后，新信道然后可以经历初始化和测距过程，从而在该新信道上实现更大的吞吐量。 在进行初始化和测距过程之后，新的信道将成为CM通信系统的完全等价的成员。

    Cancellation of interference in a communication system with application to S-CDMA
    83.
    发明授权
    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：US07110434B2

    公开(公告)日：2006-09-19

    申请号：US10142189

    申请日：2002-05-08

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

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

    IPC分类号： H04B1/707

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

    摘要： 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： 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。

    Multi-user carrier frequency offset correction for CDMA systems
    87.
    发明授权
    Multi-user carrier frequency offset correction for CDMA systems 失效
    CDMA系统的多用户载波频偏校正

    公开(公告)号：US07313122B2

    公开(公告)日：2007-12-25

    申请号：US10225963

    申请日：2002-08-22

    申请人： Nabil R. Yousef ,  Jonathan S. Min ,  Bruce J. Currivan

    发明人： Nabil R. Yousef ,  Jonathan S. Min ,  Bruce J. Currivan

    IPC分类号： H04B7/216

    CPC分类号： H04L5/026 ,  H04B1/7103 ,  H04L2027/0065

    摘要： “Multiple approaches are presented herein to perform CFO correction within CDMA systems having multiple users. Any communication receiver may be adapted to perform the CFO correction in this manner CDM. One approach assumes a diagonal CFO matrix to decouple the different codes' soft symbol decisions, and each soft symbol decision is independently corrected to obtain hard decisions. Another approach employs direct CFO matrix inversion and multiplies it by a despread soft symbol decision vector to obtain corrected soft symbol decisions. Another approach first performs a single-user correction on the despread soft symbol decisions so, which are then sliced to obtain initial hard decisions. In the next step of this particular approach the initial hard decisions are multiplied by the CFO coefficients to obtain an estimate for the undesired ICI, which is then subtracted from the despread soft symbol decisions to obtain cleaner soft symbol decisions, which then can undergo slicing.”

    摘要翻译： 本文提出了多种方法来执行具有多个用户的CDMA系统内的CFO校正。 任何通信接收机可以适于以这种方式执行CFO校正。 一种方法假设对角线CFO矩阵来解耦不同码的软符号决定，并且每个软符号决定被独立地校正以获得硬判决。 另一种方法采用直接CFO矩阵反演，并将其乘以去扩展的软符号决策矢量以获得校正的软符号决定。 另一种方法首先对解扩的软符号决定进行单用户校正，然后对其进行切片以获得初始硬判决。 在该特定方法的下一步骤中，将初始硬判决乘以CFO系数以获得不期望的ICI的估计，然后从解扩的软符号决定中减去该估计，以获得更清洁的软符号决定，然后可以进行切片 。

    System and method for detecting collisions in a shared communications medium
    88.
    发明授权
    System and method for detecting collisions in a shared communications medium 有权

    公开(公告)号：US07104534B2

    公开(公告)日：2006-09-12

    申请号：US09916576

    申请日：2001-07-30

    申请人： Bruce J. Currivan ,  Jonathan S. Min ,  Fang Lu

    发明人： Bruce J. Currivan ,  Jonathan S. Min ,  Fang Lu

    IPC分类号： B23Q3/08

    CPC分类号： H04L12/44 ,  H04L12/2801

    摘要： A system for detecting collisions in a shared communications medium, such as a TDMA medium, includes a receive path adapted to generate a first intermediate signal, a second intermediate signal, and a data symbol sequence from an input signal. A preamble detection module generates a correlation metric from the first intermediate signal. A power measurement module generates a power indication signal from the second intermediate signal. A noise measurement module generates a noise indication signal from the second intermediate signal and the data symbol sequence. A processing module is adapted to characterize the input signal as a collision for certain values of correlation metric, power indication signal, and noise indication signal.

    System for detecting collisions in a shared communications medium
    90.
    发明授权
    System for detecting collisions in a shared communications medium 有权
    用于检测共享通信介质中的冲突的系统

    公开(公告)号：US07626996B2

    公开(公告)日：2009-12-01

    申请号：US11489525

    申请日：2006-07-20

    申请人： Bruce J. Currivan ,  Jonathan S. Min ,  Fang Lu

    发明人： Bruce J. Currivan ,  Jonathan S. Min ,  Fang Lu

    IPC分类号： H04L12/413

    CPC分类号： H04L12/44 ,  H04L12/2801

    摘要： A system for detecting collisions in a shared communications medium, such as a TDMA medium, includes a receive path adapted to generate a first intermediate signal, a second intermediate signal, and a data symbol sequence from an input signal. A preamble detection module generates a correlation metric from the first intermediate signal. A power measurement module generates a power indication signal from the second intermediate signal. A noise measurement module generates a noise indication signal from the second intermediate signal and the data symbol sequence. A processing module is adapted to characterize the input signal as a collision for certain values of correlation metric, power indication signal, and noise indication signal.

    摘要翻译： 用于检测诸如TDMA介质的共享通信介质中的冲突的系统包括适于从输入信号生成第一中间信号，第二中间信号和数据符号序列的接收路径。 前导码检测模块从第一中间信号生成相关度量。 功率测量模块从第二中间信号产生功率指示信号。 噪声测量模块从第二中间信号和数据符号序列产生噪声指示信号。 处理模块适于将输入信号表征为相关度量，功率指示信号和噪声指示信号的某些值的冲突。