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7 条记录 (耗时 0.017 秒)

    Pressure waves decoupling with two transducers
    3.
    发明授权
    Pressure waves decoupling with two transducers 有权
    压力波与两个换能器去耦

    公开(公告)号：US08009511B2

    公开(公告)日：2011-08-30

    申请号：US11837213

    申请日：2007-08-10

    申请人： Nabil Hentati

    发明人： Nabil Hentati

    IPC分类号： E21B47/14 ,  E21B47/18 ,  G01V3/00

    CPC分类号： G01V11/002 ,  E21B47/182

    摘要： A telemetry system for communication in a borehole uses two spaced-apart transducers. The outputs from the two transducers are filtered to decoupled tool signals traveling in opposite directions. One of the two signals may be it telemetry signal while other signal may be pump noise.

    摘要翻译： 用于在井眼中通信的遥测系统使用两个间隔开的换能器。 来自两个换能器的输出被滤波成沿相反方向行进的解耦工具信号。 两个信号之一可能是遥测信号，而其他信号可能是泵浦噪声。

    Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels
    4.
    发明授权
    Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels 失效
    用于通过无线电信道发送信号的发射机和用于通过无线电信道发送信号的方法

    公开(公告)号：US07423958B2

    公开(公告)日：2008-09-09

    申请号：US10168894

    申请日：2000-12-16

    申请人： Marc Schrader ,  Mirko Lochau ,  Lars Harms ,  Nabil Hentati

    发明人： Marc Schrader ,  Mirko Lochau ,  Lars Harms ,  Nabil Hentati

    IPC分类号： H04J9/00

    CPC分类号： H04L27/368 ,  H04L27/2602 ,  H04L27/2626

    摘要： A transmitter for sending signals over wireless channels and a method of sending signals over wireless channels are described. The transmitter and the method are used to determine a transfer characteristic of an amplifier (8) in the transmitter. Symbols in the OFDM signals to be transmitted are multiplied by test signals at predefined points in time to compare the OFDM symbol, which has been multiplied by the test signal, upstream and downstream from the amplifier to determine the transfer characteristic of the amplifier (8). This transfer characteristic of the amplifier (8) is used by a predistorter (4) to predistort the signals according to this transfer characteristic. The test signal, which is generated by a signal generator (13), is input into a symbol of the fast information channel, the test signal having an amplitude which drives the multiplied symbol into the saturation range of the amplifier (8) with regard to its amplitude.

    摘要翻译： 描述了通过无线信道发送信号的发射机和通过无线信道发送信号的方法。 发射机和方法用于确定发射机中放大器（8）的传输特性。 要发送的OFDM信号中的符号在预定的时间点乘以测试信号，以将放大器的上游和下游已经乘以测试信号的OFDM符号进行比较，以确定放大器（8）的传输特性， 。 放大器（8）的传输特性由预失真器（4）用来根据该传送特性对信号进行预失真。 由信号发生器（13）产生的测试信号被输入到快速信息信道的符号中，测试信号具有将乘法符号驱动到放大器（8）的饱和范围内的幅度，相对于 它的幅度。

    Pressure Waves Decoupling with Two Transducers
    5.
    发明申请
    Pressure Waves Decoupling with Two Transducers 有权
    压力波与两个传感器去耦

    公开(公告)号：US20080037369A1

    公开(公告)日：2008-02-14

    申请号：US11837213

    申请日：2007-08-10

    申请人： Nabil Hentati

    发明人： Nabil Hentati

    IPC分类号： E21B47/18 ,  G01N29/32 ,  G01V1/48

    CPC分类号： G01V11/002 ,  E21B47/182

    摘要： A telemetry system for communication in a borehole uses two spaced-apart transducers. The outputs from the two transducers are filtered to decoupled tool signals traveling in opposite directions. One of the two signals may be it telemetry signal while other signal may be pump noise. It is emphasized that this abstract is provided to comply with the rules requiring an abstract which will allow a searcher or other reader to quickly ascertain the subject matter of the technical disclosure. It is submitted with the understanding that it will not be used to interpret or limit the scope or meaning of the claims.

    摘要翻译： 用于在井眼中通信的遥测系统使用两个间隔开的换能器。 来自两个换能器的输出被滤波成沿相反方向行进的解耦工具信号。 两个信号之一可能是遥测信号，而其他信号可能是泵浦噪声。 要强调的是，该摘要被提供以符合要求抽象的规则，这将允许搜索者或其他读者快速确定技术公开的主题。 提交它的理解是，它不会用于解释或限制权利要求的范围或含义。

    Method and transmitter for transmitting radio signals
    6.
    发明授权
    Method and transmitter for transmitting radio signals 失效
    用于发射无线电信号的方法和发射机

    公开(公告)号：US07308041B1

    公开(公告)日：2007-12-11

    申请号：US10088218

    申请日：2000-09-02

    申请人： Marc Schrader ,  Nabil Hentati

    发明人： Marc Schrader ,  Nabil Hentati

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

    CPC分类号： H04L27/2644 ,  H04L27/2614

    摘要： A method of transmitting wireless signals and a transmitter for transmitting wireless signals for optimally operate an amplifier of a transmitter in its linear range, signals being transmitted in orthogonal frequency division multiplexing (OFDM). The amplitudes of the OFDM signals that lie above a predefined threshold are eliminated using an additive correction signal, the phase of the OFDM signals being impressed on the additive correction signal. Furthermore, a correction signal is formed and subtracted from the OFDM signals, until there are no more amplitudes of the OFDM signal above the predefined threshold. Gauss pulses are used as correction signals due to their simple handling. Oversampling of the OFDM signals determines the amplitude values of the OFDM signals.

    摘要翻译： 一种传输无线信号的方法和用于发送无线信号的发射机，用于在其线性范围内最佳地操作发射机的放大器，在正交频分复用（OFDM）中传输信号。 使用加法校正信号消除位于预定义阈值之上的OFDM信号的振幅，将OFDM信号的相位施加在加法校正信号上。 此外，形成校正信号并从OFDM信号中减去，直到OFDM信号的幅度不超过预定阈值。 高斯脉冲由于其简单的处理而被用作校正信号。 OFDM信号的过采样决定了OFDM信号的振幅值。

    Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels
    7.
    发明授权
    Transmitter for transmitting signals over radio channels and method for transmitting signals over radio channels 失效
    用于通过无线电信道发送信号的发射机和用于通过无线电信道发射信号的方法

    公开(公告)号：US07016431B2

    公开(公告)日：2006-03-21

    申请号：US09914134

    申请日：2000-12-16

    申请人： Marc Schrader ,  Mirko Lochau ,  Lars Harms ,  Nabil Hentati

    发明人： Marc Schrader ,  Mirko Lochau ,  Lars Harms ,  Nabil Hentati

    IPC分类号： H04L25/03

    CPC分类号： H04L27/2626 ,  H03F1/3247 ,  H04L27/2602 ,  H04L27/368

    摘要： A transmitter for sending signals over wireless channels and a method of sending signals over wireless channels are described. The transmitter and the method are used to determine a transfer characteristic of an amplifier (8) in the transmitter. Test signals are input at preset times into OFDM signals to be transmitted, and then test signals amplified by the amplifier (8) are compared with test signals buffered in a measurement module (12) to determine the transfer characteristic of the amplifier (8). This transfer characteristic of the amplifier (8) is used by a predistorter (4) to predistort the signals according to this transfer characteristic. The test signal generated by a signal generator (13) is input into a synchronization symbol, with the amplitude of the test signal being increased incrementally or being large enough to determine the transfer properties of the amplifier (8). The test signal has an envelope which is not dependent on time.

    摘要翻译： 描述了通过无线信道发送信号的发射机和通过无线信道发送信号的方法。 发射机和方法用于确定发射机中放大器的传输特性。 测试信号以预设时间输入到OFDM信号中，然后将由放大器放大的测试信号与在测量模块中缓冲的测试信号进行比较，以确定放大器的传输特性。 放大器的传输特性由预失真器根据该传输特性来预测信号。 由信号发生器产生的测试信号被输入到同步符号中，其中测试信号的幅度逐渐增加或足够大以确定放大器的传输特性。 测试信号具有不依赖于时间的信封。