Linearization of RF power amplifiers using an adaptive subband predistorter
    6.
    发明授权
    Linearization of RF power amplifiers using an adaptive subband predistorter 有权
    使用自适应子带预失真器对RF功率放大器进行线性化

    公开(公告)号:US08019015B2

    公开(公告)日:2011-09-13

    申请号:US11678847

    申请日:2007-02-26

    IPC分类号: H04K1/02 H04L25/03 H04L25/49

    摘要: Predistorting an input signal prior to amplification in an RF power amplifier (206) includes isolating a plurality sub-band signals, each representing a portion of the input signal s(t). The method includes independently modifying an amplitude and a phase of each of the plurality of sub-band signals. The modification of the amplitude and/or phase is performed using a set of signal weighting parameters (weights) w and W, controlling linear and nonlinear modifications respectively, which are determined in an adaptive process by an adaptive controller (224). After modification, each of the sub-bands are summed together to obtain a predistorted input signal for an RF power amplifier (206).

    摘要翻译: 在RF功率放大器(206)中放大之前预失真输入信号包括隔离多个子带信号,每个子带信号表示输入信号s(t)的一部分。 该方法包括独立地修改多个子带信号中的每一个的振幅和相位。 使用一组信号加权参数(权重)w和W来执行幅度和/或相位的修改,分别控制在自适应控制器(224)的自适应处理中确定的线性和非线性修改。 在修改之后,将每个子带相加在一起以获得用于RF功率放大器(206)的预失真输入信号。

    Systems and methods for determining element phase center locations for an array of antenna elements
    10.
    发明授权
    Systems and methods for determining element phase center locations for an array of antenna elements 有权
    用于确定天线元件阵列的元件相位中心位置的系统和方法

    公开(公告)号:US07855681B2

    公开(公告)日:2010-12-21

    申请号:US12273981

    申请日:2008-11-19

    IPC分类号: H01Q3/00

    摘要: A method for operating a communications system is provided. The method includes receiving a plurality of signals at a plurality of antenna elements, the plurality of signals arriving at the array of antenna elements at a plurality of angles of arrival (AOAs) with respect to a reference location. The method also includes calculating a plurality of differential distance vectors between the plurality of antenna elements and the reference location, each of the plurality of differential distance vectors associated with one of the plurality of AOAs and at least one of the pluralities of signals. The method further includes obtaining a plurality of actual phase center locations for the plurality of antenna elements based on the plurality of differential distance vectors and the plurality of AOAs and providing a correction to configuration data for the array of antenna elements based at least on the plurality of actual phase center locations.

    摘要翻译: 提供了一种用于操作通信系统的方法。 该方法包括在多个天线元件处接收多个信号,该多个信号以相对于参考位置的多个到达角(AOA)到达天线元件阵列。 所述方法还包括计算多个天线元件与参考位置之间的多个差分距离矢量,所述多个差分距离矢量中的每一个与所述多个AOA中的一个和所述多个信号中的至少一个相关联。 该方法还包括基于多个差分距离向量和多个AOA获得多个天线元件的多个实际相位中心位置,并且至少基于多个天线元件为天线元件阵列提供对配置数据的校正 的实际相位中心位置。