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    DC OFFSET CORRECTION DEVICE AND ITS METHOD
    3.
    发明公开
    DC OFFSET CORRECTION DEVICE AND ITS METHOD 有权
    Gleichstrom-Offsetkorrektureinrichtung und Verfahrendafür

    公开(公告)号：EP1916773A1

    公开(公告)日：2008-04-30

    申请号：EP05772581.4

    申请日：2005-08-19

    申请人： FUJITSU LIMITED

    发明人： SHAKO, Hideharu ,  FUNYU, Yasuhito ,  OHBA, Takeshi

    IPC分类号： H04B1/04 ,  H04L27/20

    CPC分类号： H04L25/061 ,  H03M1/1019 ,  H03M1/66 ,  H04B1/30 ,  H04L25/06 ,  H04L27/364

    摘要： A reference signal and a feedback signal are written to memory and the state of a power value of a reference signal is used for judging whether the current signal is in a normal state, burst state, non-modulation state or no-wave transmission state. If the state is judged to be the burst state or no-wave transmission state, a DC offset correction is performed by selecting a feedback signal type DC offset correction method in which a DC offset is corrected by using only a feedback signal. If the state is judged to be the normal state or non-modulation state, a DC offset correction is performed by selecting a reference signal type DC offset correction method in which a DC offset is corrected by using a differential signal between the reference signal and feedback signal.

    摘要翻译： 将参考信号和反馈信号写入存储器，并且使用参考信号的功率值的状态来判断当前信号是处于正常状态，脉冲串状态，非调制状态还是无波传输状态。 如果状态被判定为突发状态或无波传播状态，则通过选择仅使用反馈信号来校正DC偏移的反馈信号型DC偏移校正方法来执行DC偏移校正。 如果状态被判断为正常状态或非调制状态，则通过选择参考信号型DC偏移校正方法来执行DC偏移校正，其中通过使用参考信号和反馈之间的差分信号校正DC偏移 信号。

    DISTORTION COMPENSATING APPARATUS AND METHOD
    5.
    发明公开
    DISTORTION COMPENSATING APPARATUS AND METHOD 有权
    VERZERRUNGSKOMPENSATIONSVORRICHTUNG UND VERFAHREN

    公开(公告)号：EP2175555A1

    公开(公告)日：2010-04-14

    申请号：EP07790314.4

    申请日：2007-07-31

    申请人： Fujitsu Limited

    发明人： SHAKO, Hideharu ,  OHBA, Takeshi

    IPC分类号： H03F1/32 ,  H03F3/24

    CPC分类号： H03F1/3247 ,  H03F2201/3233

    摘要： The present invention relates to an adaptive pre-distorter type distortion compensation apparatus to compensate for a non-linear distortion in a power amplifier of a radio transmission apparatus such as a mobile base station, for appropriately correcting the gain variation due to temperature, frequency and the like. A CPU 316 monitors, in a LUT (lookup table) 302, the average value of distortion compensation coefficients in the linear area with low input level or the maximum value of the distortion compensation coefficients, and adjusts the gain of a VATT (variable attenuator) 317 through a D/A 318 so that the values fall within a specified threshold value range. As a result, a good distortion compensation characteristic can be obtained for a power amplifier 307 even in the area with high input signal level, without monitoring the variation amount of the temperature, frequency and the like.

    摘要翻译： 本发明涉及一种用于补偿诸如移动基站的无线电传输装置的功率放大器中的非线性失真的自适应预失真器类型失真补偿装置，用于适当地校正由于温度，频率引起的增益变化， 类似。 CPU 316在LUT（查找表）302中监视具有低输入电平或失真补偿系数的最大值的线性区域中的失真补偿系数的平均值，并且调整VATT（可变衰减器）的增益， 317通过D / A 318，使得值落在指定的阈值范围内。 结果，即使在高输入信号电平的区域中也能够获得功率放大器307的良好的失真补偿特性，而不监视温度，频率等的变化量。