Iterative waterfiling with explicit bandwidth constraints
    26.
    发明申请
    Iterative waterfiling with explicit bandwidth constraints 有权
    具有显式带宽约束的迭代水文

    公开(公告)号:US20050220179A1

    公开(公告)日:2005-10-06

    申请号:US10813881

    申请日:2004-03-30

    CPC classification number: H04L5/023 H04L27/2608

    Abstract: The present invention provides an iterative method of allocating bandwidth in a twisted pair modem communication network in order to maximize communications speed while reducing NEXT interference. The method determines frequency bandwidths that cause NEXT interference and eliminates these harmful frequencies. In further embodiments, the invention adjusts other parameters of transmission such as decreasing bitloading rates and power within problematic frequency bandwidths, while increasing power and bitloading in the remaining frequencies. The methods provide an iterative process that ensures an appropriate signal to noise ratio and maximum data transfer.

    Abstract translation: 本发明提供了一种在双绞线调制解调器通信网络中分配带宽以便最大化通信速度同时降低NEXT干扰的迭代方法。 该方法确定导致NEXT干扰的频率带宽,并消除这些有害频率。 在另外的实施例中,本发明调整传输的其它参数,例如在有问题的频率带宽内降低比特加载速率和功率,同时增加剩余频率中的功率和比特加载。 该方法提供了确保适当的信噪比和最大数据传输的迭代过程。

    Common mode noise cancellation
    27.
    发明申请
    Common mode noise cancellation 有权
    共模噪声消除

    公开(公告)号:US20050053229A1

    公开(公告)日:2005-03-10

    申请号:US10800422

    申请日:2004-03-11

    Abstract: A noise cancellation system configured to isolate and process a common mode noise signal to generate a cancellation signal. The cancellation signal is combined with a differential signal to cancel unwanted differential mode noise that coupled onto the differential signal. In one embodiment a multi-channel communication system utilizes two or more channels that are in close proximity to other alien channels. A common mode signal isolation unit is configured to isolate common mode noise. The common mode noise signal is processed with a filter or other means to generate a cancellation signal. The cancellation signal is combined with the differential signal to thereby cancel noise that coupled onto the differential signal. The processed common mode noise signal may be made to approximate the differential mode noise signal. The common mode signal may be obtained from a center tap of a transformer, or a sensing winding of a three winding transformer.

    Abstract translation: 一种噪声消除系统,被配置为隔离和处理共模噪声信号以产生消除信号。 消除信号与差分信号组合以消除耦合到差分信号上的不期望的差模噪声。 在一个实施例中,多通道通信系统利用与其他外来信道非常接近的两个或更多个信道。 共模信号隔离单元被配置为隔离共模噪声。 共模噪声信号用滤波器或其他方式处理以产生消除信号。 消除信号与差分信号组合,从而消除耦合到差分信号上的噪声。 可以使经处理的共模噪声信号近似于差模噪声信号。 共模信号可以从变压器的中心抽头或三绕组变压器的感测绕组获得。

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