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1. 发明授权

US5793656A Application-specific integrated circuits having programming functions 失效
标题翻译：具有可编程功能的专用集成电路
公开(公告)号：US5793656A
公开(公告)日：1998-08-11
申请号：US268938
申请日：1994-06-30
申请人： Robert L. Richmond , Richard Clewer , Theodore C. Hockey
发明人： Robert L. Richmond , Richard Clewer , Theodore C. Hockey
IPC分类号： G06F15/78 , G06F17/10 , G06F7/38 , G05B23/02
CPC分类号： G06F15/78 , G06F17/10
摘要： An application-specific integrated circuit (ASIC) for performing a selected one of a plurality of programmable functions on one or more input signals. The ASIC includes a plurality of component circuits (21-28), each for performing a predetermined component function (F.sub.1 -F.sub.8) on a signal supplied thereto, a plurality of component routers (31-36) for selectively coupling together the plurality of component circuits (21-28), and a control processor interface (40) for receiving control signals that control the plurality of component routers (31-36) such that selected component circuits (21-28) are coupled together in a manner by which the predetermined component functions (F.sub.1 -F.sub.8) of the selected component circuits are performed on the input signal in an order necessary to accomplish the selected one of the plurality of programmable functions. An application of the above-described circuit to a signal processing ASIC useful in stand-alone satellite modems is also disclosed.
摘要翻译：一种专用集成电路（ASIC），用于在一个或多个输入信号上执行多个可编程功能中选择的一个。 ASIC包括多个组件电路（21-28），每个组件电路用于对所提供的信号执行预定分量功能（F1-F8）;多个组件路由器（31-36），用于选择性地将多个组件电路（21-28）和控制处理器接口（40），用于接收控制多个组件路由器（31-36）的控制信号，使得所选择的组件电路（21-28）以下述方式耦合在一起：按照完成所选择的多个可编程功能之一所需的顺序，对输入信号执行所选择的分量电路的预定分量函数（F1-F8）。还公开了将上述电路应用于在独立卫星调制解调器中有用的信号处理ASIC。

2. 发明授权

US06904273B2 Method and system for automatic gain control in a satellite communications system 有权
标题翻译：卫星通信系统中自动增益控制的方法和系统
公开(公告)号：US06904273B2
公开(公告)日：2005-06-07
申请号：US10043668
申请日：2002-01-10
申请人： J. Mark Steber , Richard Clewer , Kumud Patel , Bala Subramaniam
发明人： J. Mark Steber , Richard Clewer , Kumud Patel , Bala Subramaniam
IPC分类号： H03G3/30 , H04B1/06
CPC分类号： H03G3/3052
摘要： An apparatus for providing automatic gain control for use in a satellite terminal of a satellite communication system capable of transmitting a plurality of different modes of data. The apparatus includes a demodulator circuit having an analog to digital converter; a first variable attenuator having an attenuation value set on the basis of a measured power level of a predetermined data signal; and a second variable attenuator having an attenuation value set on the basis of the mode of data being received by the satellite terminal, where each of the data modes have a corresponding predetermined attenuation value associated therewith which is utilized as the attenuation value of the second variable attenuator when the satellite terminal receives the data mode.
摘要翻译：一种用于提供自动增益控制的装置，用于能够发送多种不同数据模式的卫星通信系统的卫星终端。该装置包括具有模数转换器的解调器电路; 第一可变衰减器，其具有基于预定数据信号的测量功率电平设置的衰减值; 以及第二可变衰减器，其具有基于由卫星终端接收的数据模式设置的衰减值，其中每个数据模式具有与其相关联的相应的预定衰减值，其被用作第二变量的衰减值卫星终端接收数据模式时的衰减器。

3. 发明申请

US20060045038A1 Method and apparatus for transmitting and receiving multiple services utilizing a single receiver in a broadband satellite system 审中-公开
标题翻译：用于使用宽带卫星系统中的单个接收机发送和接收多个业务的方法和装置
公开(公告)号：US20060045038A1
公开(公告)日：2006-03-02
申请号：US10927844
申请日：2004-08-27
申请人： Stanley Kay , John Schmid , Mark Steber , Adrian Morris , William Garner , Richard Clewer
发明人： Stanley Kay , John Schmid , Mark Steber , Adrian Morris , William Garner , Richard Clewer
IPC分类号： H04B7/185
CPC分类号： H04B7/18523
摘要： A satellite-based communications network employing at least one satellite and a plurality of user terminals adapted for use with the communications network. The network includes a transmitter for transmitting data to the plurality of user terminals, where the data includes a plurality of broadcast modes and/or services. The transmitter transmits data in a packetized format in which a predetermined number of data packets are transmitted in a frame, where the frame is defined as a predetermined period of time. Further, the transmitter transmits each of the plurality of broadcast modes utilizing a single carrier frequency. Each of the plurality of user terminals includes a receiver for receiving the transmitted data and for regenerating the data so that the data is made available to a device coupled to the user terminal.
摘要翻译：一种基于卫星的通信网络，其采用适于与通信网络一起使用的至少一个卫星和多个用户终端。网络包括用于向多个用户终端发送数据的发射机，其中数据包括多个广播模式和/或服务。发送器以帧的形式将帧定义为预定时间段，以预定数量的数据分组发送的分组格式发送数据。此外，发射机利用单载波频率来发送多个广播模式中的每一个。多个用户终端中的每一个包括用于接收所发送的数据并用于再生数据的接收器，使得数据对于耦合到用户终端的设备可用。

4. 发明授权

US5524126A Symbol timing recovery using fir data interpolators 失效
标题翻译：使用fir数据插值器的符号定时恢复
公开(公告)号：US5524126A
公开(公告)日：1996-06-04
申请号：US341891
申请日：1994-11-15
申请人： Richard Clewer , Janavikulam Anandkumar , Andrew Macdonald
发明人： Richard Clewer , Janavikulam Anandkumar , Andrew Macdonald
IPC分类号： H03H17/06 , H04L7/02 , H04L7/00
CPC分类号： H04L7/0029 , H04L7/0334
摘要： A symbol timing recovery method and device which aligns the received data with a free-running symbol clock such that the aligned data sampling error is minimized. The symbol timing recovery process consists of detecting the timing phase error between the transmitters symbol clock and the receiver symbol clock, filtering the error, and then using the filtered error signal to control a block which changes the phase of the data relative to the timing reference signal. A data zero-crossing phase error detector drives a loop filter whose most significant bits form the address of the FIR coefficient ROM, which allows the FIR to interpolate data at sub-symbol resolution. The FIR coefficients are then used to synchronize the received data with the receiver clock.
摘要翻译：一种符号定时恢复方法和装置，其将所接收的数据与自由运行的符号时钟对准，使得对准的数据采样误差最小化。符号定时恢复过程包括检测发射机符号时钟和接收机符号时钟之间的定时相位误差，对误差进行滤波，然后使用滤波后的误差信号来控制相对于定时参考改变数据相位的块信号。数据过零相位误差检测器驱动环路滤波器，其最高有效位形成FIR系数ROM的地址，这允许FIR以子符号分辨率内插数据。然后使用FIR系数将接收的数据与接收机时钟同步。

5. 发明授权

US5504453A Method and device for estimating phase error 失效
标题翻译：用于估计相位误差的方法和装置
公开(公告)号：US5504453A
公开(公告)日：1996-04-02
申请号：US323283
申请日：1994-10-14
申请人： Andrew MacDonald , Richard Clewer , Janavikulam Anandkumar
发明人： Andrew MacDonald , Richard Clewer , Janavikulam Anandkumar
IPC分类号： H04L27/227 , H04L27/22
CPC分类号： H04L27/2273
摘要： A method and apparatus for use in estimating phase error in a phase-modulated carrier. The method and apparatus of the present invention may be embodied in a phase-error-estimator circuit which is typically incorporated into a demodulator of a digital communications receiver. In general, the phase-error-estimator circuit receives the I and Q components of a phase-modulated signal, and outputs an estimate of the phase error, if any, in the phase-modulated carrier signal associated with the received I and Q. Preferably, the phase-error-estimator circuit includes an index/polarity generator circuit coupled to a look-up table. The index/polarity generator receives I and Q and maps them onto a reduced range of phase angles represented by values X and Y. X and Y are fed to a reduced and substantially triangular look-up table which outputs the stored phase-error-estimate for the particular X and Y inputs.
摘要翻译：一种用于估计相位调制载波中的相位误差的方法和装置。本发明的方法和装置可以体现在通常并入数字通信接收机的解调器中的相位误差估计器电路中。通常，相位误差估计器电路接收相位调制信号的I分量和Q分量，并输出与所接收的I和Q相关联的相位调制载波信号中相位误差的估计（如果有的话）。优选地，相位误差估计器电路包括耦合到查找表的索引/极性发生器电路。索引/极性发生器接收I和Q并将它们映射到由值X和Y表示的相位角的减小的范围上.X和Y被馈送到减小且基本上三角形的查找表，其输出存储的相位误差估计对于特定的X和Y输入。

6. 发明授权

US06985523B2 Method and system for adaptive equalization for receivers in a wide-band satellite communications system 有权
公开(公告)号：US06985523B2
公开(公告)日：2006-01-10
申请号：US10043775
申请日：2002-01-10
申请人： Richard Sims , Richard Clewer , Neal Becker , Yezdi Antia , J. Mark Steber
发明人： Richard Sims , Richard Clewer , Neal Becker , Yezdi Antia , J. Mark Steber
IPC分类号： H03K5/159
CPC分类号： H04L25/03133 , H04B7/18513 , H04L2025/03401 , H04L2025/03477 , H04L2025/03617
摘要： An apparatus for providing automatic gain control for use in a satellite terminal of a satellite communication system capable of transmitting a plurality of different modes of data. The apparatus includes a demodulator circuit having an analog to digital converter; a first variable attenuator having an attenuation value set on the basis of a measured power level of a predetermined data signal; and a second variable attenuator having an attenuation value set on the basis of the mode of data being received by the satellite terminal, where each of the data modes have a corresponding predetermined attenuation value associated therewith which is utilized as the attenuation value of the second variable attenuator when the satellite terminal receives the data mode.

7. 发明授权

US5548244A Method and apparatus for eliminating DC offset for digital I/Q demodulators 失效
标题翻译：用于消除数字I / Q解调器的直流偏移的方法和装置
公开(公告)号：US5548244A
公开(公告)日：1996-08-20
申请号：US339136
申请日：1994-11-14
申请人： Richard Clewer
发明人： Richard Clewer
IPC分类号： H03D3/00 , H03D7/16 , H03D1/00 , H04B1/26
CPC分类号： H03D7/166 , H03D3/007 , H03D7/161
摘要： A method and apparatus utilizing the techniques of frequency shifting and filtering for converting an input signal having a desired signal at intermediate frequency and an undesired DC offset to a baseband frequency signal in which the undesired DC offset is eliminated. The apparatus includes a first multiplier for multiplying the input signal by a signal having substantially the same intermediate frequency plus an offset frequency (.DELTA.f) to produce a first output signal wherein the desired signal is shifted in frequency to the offset frequency (.DELTA.f) and the undesired DC offset is unaffected. The apparatus also includes a second multiplier coupled to the first multiplier for multiplying the first output signal by a signal having substantially the same offset frequency (.DELTA.f) to produce a second output signal having the desired signal shifted to baseband frequency and the undesired DC offset shifted in frequency to the offset frequency .DELTA.f. In addition, a filter coupled to the second multiplier filters the output signal to remove the undesired DC offset while leaving the desired signal, now located at baseband frequency, intact.
摘要翻译：一种使用频移和滤波技术的方法和装置，用于将具有中频的期望信号的输入信号和不期望的DC偏移转换成消除不期望的DC偏移的基带频率信号。该装置包括第一乘法器，用于将输入信号乘以具有基本相同的中频加偏移频率（DELTA f）的信号，以产生第一输出信号，其中期望的信号在频率上移动到偏移频率（DELTA f）并且不期望的DC偏移不受影响。该装置还包括耦合到第一乘法器的第二乘法器，用于将第一输出信号乘以具有基本相同偏移频率（DELTA f）的信号，以产生具有偏移到基带频率的期望信号的第二输出信号和不期望的DC偏移频率偏移到偏移频率DELTA f。此外，耦合到第二乘法器的滤波器对输出信号进行滤波以去除不期望的DC偏移，同时留下现在位于基带频率处的所需信号。

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