中科微点-全球专利检索

  1. Login
  2. Sign Up

Search Results

10 records (took 0.014 seconds)

    METHOD AND APPARATUS FOR MINIMIZING CO-CHANNEL INTERFERENCE
    3.
    发明申请
    METHOD AND APPARATUS FOR MINIMIZING CO-CHANNEL INTERFERENCE 审中-公开
    用于最小化共通道干扰的方法和装置

    公开(公告)号：WO2005101840A2

    公开(公告)日：2005-10-27

    申请号：PCT/US2005/012424

    申请日：2005-04-11

    Applicant: THE DIRECTV GROUP, INC.

    Inventor： LEE, Lin-Nan ,  SUN, Feng-Wen ,  VON ANCKEN, Adam ,  SANTORU, Joseph, A. ,  CHEN, Ernest, C. ,  MAITRA, Shamik ,  LAI, Dennis ,  ZHOU, Guangcai ,  LIN, Tung-Sheng

    IPC: H04N7/167

    CPC classification number: H04N5/211 ,  H04B7/18513 ,  H04H20/51 ,  H04L25/03866

    Abstract: An approach is provided for minimizing co-channel interference in a communication system (100) is disclosed. A header (401) of a first frame is scrambled based on a first unique word (411, 413). A header (401) of a second frame is scrambled based on a second unique word (411, 413). The first frame including the corresponding scrambled header (401) and the second frame including the corresponding scrambled header (401) are transmitted, respectively, over adjacent co-channels of the communication system (100). Each of the frames further includes a payload (403) and a pilot block (405). The payload (403) and the pilot black (405) of the first frame are scrambled based on a first scrambling sequence. The payload (403) and the pilot black (405) of the second frame are scrambled based on a second scrambling sequence. The above arrangement is particularly suited to a digital satellite broadcast and interactive system (100).

    Abstract translation: 公开了一种用于最小化通信系统（100）中的同信道干扰的方法。 基于第一唯一字（411,413）对第一帧的报头（401）进行加扰。 基于第二唯一字（411,413）对第二帧的报头（401）进行加扰。 分别在通信系统（100）的相邻共同信道上发送包括对应的加扰报头（401）和包括对应的加扰报头（401）的第二帧的第一帧。 每个帧还包括有效载荷（403）和导频块（405）。 基于第一加扰序列对第一帧的有效载荷（403）和导频黑（405）进行加扰。 基于第二加扰序列对第二帧的有效负载（403）和导频黑（405）进行加扰。 上述布置特别适用于数字卫星广播和交互式系统（100）。

    OPTIMIZED UPLINK EFFICIENCIES FOR TRANSMISSION OF SATELLITE DATA
    4.
    发明申请
    OPTIMIZED UPLINK EFFICIENCIES FOR TRANSMISSION OF SATELLITE DATA 审中-公开
    优化卫星数据传输的上行效率

    公开(公告)号：WO2008048530A2

    公开(公告)日：2008-04-24

    申请号：PCT/US2007/021955

    申请日：2007-10-15

    Applicant: THE DIRECTV GROUP, INC. ,  ZHOU, Guangcai ,  LIN, Tung-sheng ,  LAI, Dennis ,  SANTORU, Joseph ,  CHEN, Ernest, C. ,  MAITRA, Shamik ,  COMEAUX, Cecilia

    Inventor： ZHOU, Guangcai ,  LIN, Tung-sheng ,  LAI, Dennis ,  SANTORU, Joseph ,  CHEN, Ernest, C. ,  MAITRA, Shamik ,  COMEAUX, Cecilia

    CPC classification number: H04B17/0085 ,  H03F1/32 ,  H04B17/15

    Abstract: Systems and methods for characterizing amplifiers. A system for characterizing an amplifier in accordance with the present invention comprises a Gaussian signal source for generating a signal in the frequency domain, a notch filter, coupled to the Gaussian Noise source, wherein the notch filter has a notch at a specified frequency and a frequency bandwidth, the frequency bandwidth encompassing the specified frequency, an Inverse Fast Fourier Transform device, coupled to an output of the notch filter, a normalization device, coupled to the Inverse Fast Fourier Transform device, an amplifier under test, coupled to the normalization device, for amplifying the signal generated by the Gaussian signal source, and a measurement device, coupled to an output of the amplifier, for measuring a power output of the amplifier in the frequency bandwidth and a noise output at the specified notch frequency, and for calculating the ratio between the power output and the noise output.

    Abstract translation: 用于表征放大器的系统和方法。 根据本发明的用于表征放大器的系统包括用于生成频域中的信号的高斯信号源，耦合到高斯噪声源的陷波滤波器，其中陷波滤波器具有指定频率处的陷波和 频率带宽，包含指定频率的频率带宽，耦合到陷波滤波器的输出的快速傅立叶逆变换装置，耦合到快速傅立叶逆变换装置的归一化装置，耦合到归一化装置的待测试放大器 ，用于放大由高斯信号源产生的信号;以及测量装置，耦合到放大器的输出，用于测量放大器在频率带宽中的功率输出和在指定的陷波频率下输出的噪声，并且用于计算 功率输出与噪声输出之间的比率。

    ESTIMATING THE OPERATING POINT ON A NONLINEAR TRAVELING WAVE TUBE AMPLIFIER
    10.
    发明申请
    ESTIMATING THE OPERATING POINT ON A NONLINEAR TRAVELING WAVE TUBE AMPLIFIER 审中-公开
    估计非线性行波管放大器的运行点

    公开(公告)号：WO2004040406A2

    公开(公告)日：2004-05-13

    申请号：PCT/US2003/033130

    申请日：2003-10-17

    Applicant: THE DIRECTV GROUP, INC. ,  CHEN, Ernest, C. ,  MAITRA, Shamik

    Inventor： CHEN, Ernest, C. ,  MAITRA, Shamik

    IPC: G06F

    CPC classification number: H04B7/18515

    Abstract: A method, apparatus, article of manufacture, and a memory structure provide the ability to determine an input operating point and an output operating point on a non-linear traveling wave tube amplifier (TWTA). The non-linearity of the TWTA is measured. An input roots mean-square (RMS) value of an input signal used to measure the non-linearity of the TWTA is computed. The RMS value identifies an input operating point of the measured non-linearity of the TWTA. Lastly, an output operating point is obtained.

    Abstract translation: 方法，装置，制品和存储结构提供了确定非线性行波管放大器（TWTA）上的输入工作点和输出工作点的能力。 测量TWTA的非线性度。 计算用于测量TWTA的非线性度的输入信号的输入均方根（RMS）值。 RMS值标识TWTA的测量非线性的输入工作点。 最后，获得输出工作点。

Patent Agency Ranking