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    DISTORTION COMPENSATING DEVICE
    2.
    发明公开
    DISTORTION COMPENSATING DEVICE 有权
    VERZERRUNGSKOMPENSATIONSEINRICHTUNG

    公开(公告)号：EP1953913A4

    公开(公告)日：2008-10-29

    申请号：EP05787565

    申请日：2005-09-28

    申请人： FUJITSU LTD

    发明人： NAGATANI KAZUO ,  ISHIKAWA HIROYOSHI ,  FUDABA NOBUKAZU ,  HAMADA HAJIME ,  KUBO TOKURO

    IPC分类号： H03F1/32

    CPC分类号： H03F1/3247 ,  H03F1/3294 ,  H03F2200/336 ,  H03F2201/3233

    摘要： A distortion compensating device comprises an amplifier for amplifying an input signal, a computing section for determining a distortion compensation coefficient of the amplifier corresponding to the amplitude level of the input signal from the input signal and the output signal from the amplifier, a memory for storing the determined distortion compensation coefficient at a write address associated with the amplitude level of the input signal, a distortion compensating section for reading the distortion compensation coefficient from the read address of the memory and compensating the distortion of the input signal by using the distortion compensation coefficient, and an address creating section for creating the write address and the read address according to the amplitude level of the input signal. The address creating section creates a first address according to the amplitude level of the input signal as the write address and a second address near to the first address as the read address.

    摘要翻译： 一种失真补偿装置包括：放大器，用于放大输入信号;计算部分，用于根据输入信号和来自放大器的输出信号确定与输入信号的振幅电平相对应的放大器的失真补偿系数;存储器，用于存储 所确定的与输入信号的振幅电平相关联的写入地址处的失真补偿系数，失真补偿部分，用于从存储器的读取地址读取失真补偿系数，并且通过使用失真补偿系数来补偿输入信号的失真 以及地址创建部分，用于根据输入信号的幅度电平来创建写入地址和读取地址。 地址创建部分根据作为写入地址的输入信号的幅度电平和接近第一地址的第二地址创建第一地址作为读取地址。

    TABLE REFERENCE PREDISTORTOR
    3.
    发明公开
    TABLE REFERENCE PREDISTORTOR 有权
    表引用预失真

    公开(公告)号：EP1511182A4

    公开(公告)日：2007-05-02

    申请号：EP02730844

    申请日：2002-05-31

    申请人： FUJITSU LTD

    发明人： MANIWA TORU ,  KUBO TOKURO ,  NAGATANI KAZUO ,  ISHIKAWA HIROYOSHI

    IPC分类号： H03F1/32 ,  H04L27/36 ,  H04B1/04 ,  H04L27/00

    CPC分类号： H04L27/368 ,  H03F1/3247

    摘要： A predistortor for adequately compensating the distortion of a power amplifier even if there is a frequency amplitude difference. The predistortor comprises means (2) where stored is a distortion compensation coefficient corresponding to a table reference value which is the feature of the envelope of a transmission signal before the input into the power amplifier and means (3) for converting the feature to a predetermined value according to the magnitude of the feature. If the feature is, e.g., the amplitude value of the envelope and if the amplitude value is small, the amplitude value is increased to e.g., an upper limit of the linear range of the amplifier.

    DISTORTION COMPENSATION APPARATUS
    4.
    发明公开
    DISTORTION COMPENSATION APPARATUS 有权
    失真补偿设备

    公开(公告)号：EP1499027A4

    公开(公告)日：2005-08-10

    申请号：EP02730823

    申请日：2002-05-31

    申请人： FUJITSU LTD

    发明人： ISHIKAWA HIROYOSHI ,  KUBO TOKURO ,  NAGATANI KAZUO ,  OISHI YASUYUKI ,  HAMADA HAJIME ,  FUDABA NOBUKAZU ,  MANIWA TORU ,  HAYASHI HIROYUKI

    IPC分类号： H03F1/32 ,  H04B1/04 ,  H04L27/00

    CPC分类号： H03F1/3247 ,  H03F2201/3231 ,  H03F2201/3233

    摘要： A distortion compensation apparatus in which a distortion compensation coefficient is calculated so as to reduce a difference signal between a reference signal which is a transmission signal and a feedback signal, an old distortion compensation coefficient is updated by the distortion compensation coefficient calculated, and the transmission signal is subjected to a distortion compensation in accordance with the distortion compensation coefficient. The apparatus alternately generates a phase compensation period for correcting a phase difference between the reference signal and the feedback signal and a distortion compensation coefficient updating period. Correction is made so that the phase difference is zero in the phase correction period and the distortion compensation coefficient is updated in the distortion compensation coefficient updating period.