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78 条记录 (耗时 0.041 秒)

    OPTIMIZED UPLINK EFFICIENCIES FOR TRANSMISSION OF SATELLITE DATA
    3.
    发明申请
    OPTIMIZED UPLINK EFFICIENCIES FOR TRANSMISSION OF SATELLITE DATA 有权
    优化传输卫星数据的上网效率

    公开(公告)号：US20090224824A1

    公开(公告)日：2009-09-10

    申请号：US12421485

    申请日：2009-04-09

    申请人： Guangcai Zhou ,  Tung-Sheng Lin ,  Dennis Lai ,  Joseph Santoru ,  Ernest C. Chen ,  Shamik Maitra ,  Cecilia Comeaux

    发明人： Guangcai Zhou ,  Tung-Sheng Lin ,  Dennis Lai ,  Joseph Santoru ,  Ernest C. Chen ,  Shamik Maitra ,  Cecilia Comeaux

    IPC分类号： G01R19/00

    CPC分类号： H04B17/0085 ,  H03F1/32 ,  H04B17/15

    摘要： 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.

    摘要翻译： 表征放大器的系统和方法。 用于表征根据本发明的放大器的系统包括用于产生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反相快速傅立叶变换装置，耦合到快速傅立叶逆变换装置的归一化装置，被测放大器，耦合到归一化装置 ，用于放大由高斯信号源产生的信号，以及耦合到放大器的输出的测量装置，用于测量放大器在频率带宽中的功率输出和在指定陷波频率下的噪声输出，并用于计算 功率输出与噪声输出之间的比例。

    OPTIMIZED UPLINK EFFICIENCIES FOR TRANSMISSION OF SATELLITE DATA
    4.
    发明申请
    OPTIMIZED UPLINK EFFICIENCIES FOR TRANSMISSION OF SATELLITE DATA 有权
    优化传输卫星数据的上网效率

    公开(公告)号：US20080129374A1

    公开(公告)日：2008-06-05

    申请号：US11870955

    申请日：2007-10-11

    申请人： Guangcai Zhou ,  Tung-Sheng Lin ,  Dennis Lai ,  Joseph Santoru ,  Ernest C. Chen ,  Shamik Maitra ,  Cecilia Comeaux

    发明人： Guangcai Zhou ,  Tung-Sheng Lin ,  Dennis Lai ,  Joseph Santoru ,  Ernest C. Chen ,  Shamik Maitra ,  Cecilia Comeaux

    IPC分类号： G01R19/00

    CPC分类号： H04B17/0085 ,  H03F1/32 ,  H04B17/15

    摘要： 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.

    摘要翻译： 表征放大器的系统和方法。 用于表征根据本发明的放大器的系统包括用于产生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反相快速傅立叶变换装置，耦合到快速傅立叶逆变换装置的归一化装置，被测放大器，耦合到归一化装置 ，用于放大由高斯信号源产生的信号，以及耦合到放大器的输出的测量装置，用于测量放大器在频率带宽中的功率输出和在指定陷波频率下的噪声输出，并用于计算 功率输出与噪声输出之间的比例。

    Simplified scrambling scheme for satellite broadcasting systems
    9.
    发明授权
    Simplified scrambling scheme for satellite broadcasting systems 有权
    卫星广播系统的简化扰频方案

    公开(公告)号：US07403574B2

    公开(公告)日：2008-07-22

    申请号：US10568384

    申请日：2004-08-27

    申请人： Ernest C. Chen ,  Dennis Lai ,  Tung-Sheng Lin ,  William C. Lindsey ,  Shamik Maitra ,  Joseph Santoru ,  Guangcai Zhou

    发明人： Ernest C. Chen ,  Dennis Lai ,  Tung-Sheng Lin ,  William C. Lindsey ,  Shamik Maitra ,  Joseph Santoru ,  Guangcai Zhou

    IPC分类号： H03C3/00

    CPC分类号： H04L25/03866 ,  H04B7/18523 ,  H04L27/36 ,  H04N21/23895 ,  H04N21/4382 ,  H04N21/43853 ,  H04N21/6143 ,  H04N21/6193

    摘要： A simplified scrambling scheme that unifies all signals of a satellite broadcasting system, including frame header (404), frame body (402) and pilot symbols (408) with a common reference phase. This results in the simplification and increased flexibility of the receiver front-end design without affecting the overall system performance. In many current communications systems with frame headers and pilot symbols, the phases of frame headers and pilot syrnbols are not designed to be aligned with any constellation points of the modulated data from the frame body. This scrambling scheme takes into account possible impact due to irregular phase changes between frame headers/pilot symbols and modulated data.

    摘要翻译： 一种简化的加扰方案，其将具有公共参考相位的卫星广播系统的所有信号（包括帧头部（404）），帧体（402）和导频符号（408）统一起来。 这导致了接收机前端设计的简化和增加的灵活性，而不会影响整个系统的性能。 在具有帧头和导频符号的许多当前通信系统中，帧头和导频符号的相位不被设计为与来自帧体的调制数据的任何星座点对准。 该加扰方案考虑到由帧头/导频符号和调制数据之间的不规则相位变化引起的可能的影响。

    Optimized uplink efficiencies for transmission of satellite data
    10.
    发明授权
    Optimized uplink efficiencies for transmission of satellite data 有权
    优化卫星数据传输的上行效率

    公开(公告)号：US07859330B2

    公开(公告)日：2010-12-28

    申请号：US12421485

    申请日：2009-04-09

    申请人： Guangcai Zhou ,  Tung-Sheng Lin ,  Dennis Lai ,  Joseph Santoru ,  Ernest C. Chen ,  Shamik Maitra ,  Cecilia Comeaux

    发明人： Guangcai Zhou ,  Tung-Sheng Lin ,  Dennis Lai ,  Joseph Santoru ,  Ernest C. Chen ,  Shamik Maitra ,  Cecilia Comeaux

    IPC分类号： G01R19/00

    CPC分类号： H04B17/0085 ,  H03F1/32 ,  H04B17/15

    摘要： 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.

    摘要翻译： 表征放大器的系统和方法。 用于表征根据本发明的放大器的系统包括用于产生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反相快速傅立叶变换装置，耦合到快速傅立叶逆变换装置的归一化装置，被测放大器，耦合到归一化装置 ，用于放大由高斯信号源产生的信号，以及耦合到放大器的输出的测量装置，用于测量放大器在频率带宽中的功率输出和在指定陷波频率下的噪声输出，并用于计算 功率输出与噪声输出之间的比例。