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    Method and apparatus for adaptive digital predistortion using nonlinear and feedback gain parameters
    6.
    发明申请
    Method and apparatus for adaptive digital predistortion using nonlinear and feedback gain parameters 有权
    使用非线性和反馈增益参数的自适应数字预失真的方法和装置

    公开(公告)号：US20050231279A1

    公开(公告)日：2005-10-20

    申请号：US10825614

    申请日：2004-04-15

    申请人： James Moffatt ,  Jeffrey Saunders

    发明人： James Moffatt ,  Jeffrey Saunders

    IPC分类号： H03F1/26 ,  H03F1/32

    CPC分类号： H03F1/3247 ,  H03F1/3252 ,  H03F1/3258 ,  H03F1/3294

    摘要： A predistorter is disclosed that predistorts an input signal based on one or more static coefficients that are representative of a non-linear distortion characteristic of an amplifier. The input signal is also processed based on a non-linear gain parameter that reduces an error metric between the input signal and a feedback signal. The nonlinear gain parameter adapts an amount of nonlinearity introduced by the predistorter. The non-linear gain adaptation is performed, for example, when the input voltage is above a threshold input voltage. The input signal can be processed by multiplying the input signal by the non-linear gain parameter followed by table-coefficient processing, or by both multiplying the input by the non-linear gain parameter followed by dividing the table-coefficient processed output signal by the same non-linear gain parameter. The input signal can also be processed based on a feedback gain parameter that compensates for a small-signal gain of the feedback loop. The feedback gain parameter attempts to maintain a small-signal gain of approximately unity.

    摘要翻译： 公开了一种预失真器，其基于代表放大器的非线性失真特性的一个或多个静态系数来预失真输入信号。 还基于减小输入信号和反馈信号之间的误差度量的非线性增益参数来处理输入信号。 非线性增益参数适应预失真器引入的非线性量。 例如，当输入电压高于阈值输入电压时执行非线性增益适配。 输入信号可以通过将输入信号乘以非线性增益参数，然后进行表格系数处理，或者将输入乘以非线性增益参数，然后将表格系数处理的输出信号除以 相同的非线性增益参数。 还可以基于补偿反馈回路的小信号增益的反馈增益参数来处理输入信号。 反馈增益参数尝试维持近似一致的小信号增益。

    Method and apparatus for performing digital pre-distortion
    7.
    发明申请
    Method and apparatus for performing digital pre-distortion 有权
    用于执行数字预失真的方法和装置

    公开(公告)号：US20060033569A1

    公开(公告)日：2006-02-16

    申请号：US10919029

    申请日：2004-08-16

    申请人： Mohammad Mobin ,  Jeffrey Saunders ,  Lane Smith

    发明人： Mohammad Mobin ,  Jeffrey Saunders ,  Lane Smith

    IPC分类号： H03F1/26

    CPC分类号： H03F1/3241 ,  H03F2200/468

    摘要： A pre-distorter that compensates for amplitude and phase distortion created by an amplifier. During a training session, the amplifier is stimulated with input signals of pre-selected amplitude and phase at various temperatures and the amplifier output is captured and converted into data sets. Polynomials are then fitted to the data sets and inverses of the polynomials are determined. The coefficients of the inverse polynomials are then saved for each temperature. During operation, the amplifier temperature is predicted based on the amplifier input signal and the coefficients associated with the predicted temperature are selected to be applied to the input signal to compensate for amplitude and phase distortion caused by the amplifier.

    摘要翻译： 一个预失真器，用于补偿放大器产生的幅度和相位失真。 在训练期间，放大器用各种温度的预选幅度和相位的输入信号进行激励，并且放大器输出被捕获并转换为数据集。 然后将多项式拟合到数据集中，并确定多项式的倒数。 然后针对每个温度保存逆多项式的系数。 在操作期间，基于放大器输入信号预测放大器温度，并且选择与预测温度相关联的系数以施加到输入信号以补偿由放大器引起的幅度和相位失真。