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148 条记录 (耗时 0.039 秒)

    Method and apparatus for capacity increase and enhanced communications performance in CATV networks
    1.
    发明授权
    Method and apparatus for capacity increase and enhanced communications performance in CATV networks 失效
    CATV网络中容量增加和通信性能提高的方法和装置

    公开(公告)号：US06647069B1

    公开(公告)日：2003-11-11

    申请号：US09302872

    申请日：1999-04-30

    申请人： Mordechai Segal ,  Ofir Shalvi ,  Zvi Reznic

    发明人： Mordechai Segal ,  Ofir Shalvi ,  Zvi Reznic

    IPC分类号： H04L2710

    CPC分类号： H04N21/2383 ,  H04N7/102 ,  H04N21/4382

    摘要： In a cable television (CATV) data communication network, channel throughput and communications robustness are increased in a manner that improves speed of data transmission while maintaining compatibility with existing specifications and equipment. Enhanced throughput can be realized using the return channel of the CATV network. Alternatively, data retransmission and/or diversity techniques can be used to improve throughput.

    摘要翻译： 在有线电视（CATV）数据通信网络中，以提高数据传输速度同时保持与现有规格和设备的兼容性的方式来增加信道吞吐量和通信鲁棒性。 可以使用CATV网络的返回通道实现增强的吞吐量。 或者，可以使用数据重传和/或分集技术来提高吞吐量。

    Constellation selection in a communication system
    8.
    发明授权
    Constellation selection in a communication system 有权
    通讯系统中的星座选择

    公开(公告)号：US07274735B2

    公开(公告)日：2007-09-25

    申请号：US10273558

    申请日：2002-10-18

    申请人： Itay Lusky ,  Daniel Wajcer ,  Yosef Bendel ,  Yigal Bitran ,  Naftali Sommer ,  Ofir Shalvi ,  Zvi Reznic ,  Ariel Yagil ,  Eli Haim

    发明人： Itay Lusky ,  Daniel Wajcer ,  Yosef Bendel ,  Yigal Bitran ,  Naftali Sommer ,  Ofir Shalvi ,  Zvi Reznic ,  Ariel Yagil ,  Eli Haim

    IPC分类号： H04B3/46

    CPC分类号： H04L1/20 ,  H04L1/0001 ,  H04L1/0003 ,  H04L1/0017 ,  H04L1/0019

    摘要： A method is provided to provide data to automatically estimate channel performance in a communication system if a different order constellation is used comprising the steps of: receiving an input signal from the channel; passing the input signal to a slicer having an output signal; determining signal noise by taking the difference between the input signal and output signal; identifying a beginning of a noise event when the signal noise is greater than a predefined first threshold; identifying an end of a noise event when the signal noise is less than a predefined second threshold; and providing for output the beginning of the noise event and the end of the noise event. Other systems and methods are disclosed.

    摘要翻译： 提供一种提供数据以自动估计通信系统中的信道性能的方法，如果使用不同的订单星座包括以下步骤：从信道接收输入信号; 将输入信号传递到具有输出信号的限幅器; 通过取输入信号和输出信号之差来确定信号噪声; 当信号噪声大于预定义的第一阈值时，识别噪声事件的开始; 当信号噪声小于预定义的第二阈值时，识别噪声事件的结束; 并提供输出噪声事件的开始和噪声事件的结束。 公开了其它系统和方法。

    Method and device for combating PCM line impairments
    10.
    发明授权
    Method and device for combating PCM line impairments 有权
    防止PCM线路损伤的方法和装置

    公开(公告)号：US06553074B1

    公开(公告)日：2003-04-22

    申请号：US09271818

    申请日：1999-03-18

    申请人： Ofir Shalvi ,  Zvi Reznic ,  Etai Zaltsman

    发明人： Ofir Shalvi ,  Zvi Reznic ,  Etai Zaltsman

    IPC分类号： H04B1404

    CPC分类号： H04L25/4927

    摘要： A method and device for combating logarithmic quantization and Robbed Bit Signaling (RBS) impairments that..are typical to PCM telephone lines is descried. An apparatus is described which includes a front-end unit which receives samples of the digital PCM line, an impairment identifier unit which identifies samples that have a high likelihood to have, large impairments due to the PCM line, an impairment estimator unit which estimates the value of impairment caused by the digital line, a samples reconstructor unit which fixes received samples by subtracting from them the value of the estimated impairment and an output unit transfers the reconstructed samples to a receiver. The method allows improving signal quality at the output of the PCM line, and thus improving data rates and robustness of digital communication receivers, and particularly of V.34 receivers, or V.90 transceivers that are digitally linked to the PCM, line.

    摘要翻译： 描述了一种用于对抗PCM电话线路的典型对数量化和Robbed Bit Signaling（RBS）损伤的方法和装置。 描述了一种装置，其包括接收数字PCM线路的采样的前端单元，识别具有高似然性的样本的损害标识符单元，所述损伤识别单元具有由于PCM线路造成的大的损伤，所述损伤估计器单元估计 由数字线引起的损害的值，样本重建单元，其通过从其中减去估计的损害的值来固定接收的样本，并且输出单元将重建的样本传送到接收器。 该方法允许改善PCM线输出端的信号质量，从而提高数字通信接收机，特别是数字连接到PCM线路的V.34接收机或V.90收发器的数据速率和鲁棒性。