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    SYSTEM FOR ESTIMATING A NON-LINEAR CHARACTERISTIC OF AN AMPLIFIER
    2.
    发明授权
    SYSTEM FOR ESTIMATING A NON-LINEAR CHARACTERISTIC OF AN AMPLIFIER 有权
    DEVICE一个评价的助推器非线性特性的

    公开(公告)号：EP1258078B1

    公开(公告)日：2004-03-17

    申请号：EP00909248.7

    申请日：2000-02-24

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： PERTHOLD, Rainer ,  GERHÄUSER, Heinz ,  ULBRICHT, Gerald

    IPC分类号： H03F1/32

    CPC分类号： H03F1/3247 ,  H03F2200/102

    摘要： In a method for estimating a non-linear characteristic of an amplifier (18), an input signal (10) is provided, a reference signal (20) is determined based on the power of the input signal (10), the input signal (10) is amplified using said amplifier (18) in order to produce an amplified signal (26), a measurement signal (22) is determined based on the power of the amplified signal (26) and respective samples of the measurement signal (22) are associated with respective samples of the reference signal (20). A gain value of said amplifier (18) for each sample is determined from the respective samples of the reference signal (20) and the measurement signal (22). An operating range of the amplifier is divided into a plurality of power sections and an averaged gain value is produced for each power section. Thereafter, a measure of the deviation of the gain values associated with a power section from said averaged gain value is determined. Then, averaged gain values are rejected which have a measure of the deviation which exceeds a predetermined threshold. Finally, an interpolation is performed using averaged gain values which have not been rejected in order to produce an estimation of said non-linear characteristic of said amplifier (18).

    SENDESTUFE
    5.
    发明公开
    SENDESTUFE 审中-公开

    公开(公告)号：EP1573899A2

    公开(公告)日：2005-09-14

    申请号：EP03776903.1

    申请日：2003-11-14

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： JAFARI, Houman ,  BURDENSKI, Ralf ,  ULBRICHT, Gerald

    IPC分类号： H03F1/02 ,  H03F3/19 ,  H04L27/20

    CPC分类号： H04L27/2017 ,  H04L27/34

    摘要： The invention relates to a transmitter stage working according to the envelope restoration principle. Said stage comprises a device (14) for providing an amplitude representation and a phase representation of an amplitude and phase modulated signal which is to be sent, a phase control loop (PLL) with a feed-forward branch (16) and a feedback branch (17) and an amplification control device (21) which is embodied in such a manner that is can transform the amplitude representation into an amplification control signal which can be fed into in the amplification control input of a non-linear power amplifier. A digital/analog converter is arranged in the feed-forward branch (16). Additionally, an analog/digital converter is arranged in the feedback branch (17) such that the phase detector of the phase control loop is embodied in a digital form. The invention provides a transmitter stage which is precise and which can be economically implemented as a result of a large amount of digital signal processing.

    SYSTEM FOR PRE-DISTORTING AN INPUT SIGNAL FOR A POWER AMPLIFIER USING NON-ORTHOGONAL COORDINATES
    7.
    发明授权
    SYSTEM FOR PRE-DISTORTING AN INPUT SIGNAL FOR A POWER AMPLIFIER USING NON-ORTHOGONAL COORDINATES 有权
    DEVICE FOR A预失真输入信号功率放大器利用非正交坐标

    公开(公告)号：EP1258079B1

    公开(公告)日：2003-09-10

    申请号：EP00910707.9

    申请日：2000-02-24

    申请人： Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.

    发明人： PERTHOLD, Rainer ,  ULBRICHT, Gerald ,  GERHÄUSER, Heinz

    IPC分类号： H03F1/32

    CPC分类号： H03F1/3241

    摘要： A circuit for pre-distorting an input signal v to be transmitted via a power amplifier having a non-linear transmission characteristic to produce a pre-distorted input signal y comprises an estimator (10) for determining an estimation signal (22) based on the power of said input signal v . A look-up table (20) is provided for storing complex pre-distortion coefficients BR and AI which depend on the power of the input Signal v and the non-linear transmission characteristic of the power amplifier determined in advance. For BR, the relation BR = AR - K, K being a constant with 0 v such that the distortion introduced by the non-linear transmission characteristic of the power amplifier is substantially compensated according to magnitude and phase. Finally, a pre-distorter is provided in order to pre-distort the input signal according to y = v • (K + BR + jAI).