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1. 发明授权

US4245345A Timing acquisition in voiceband data sets 失效
标题翻译：语音带数据集中的时序采集
公开(公告)号：US4245345A
公开(公告)日：1981-01-13
申请号：US75646
申请日：1979-09-14
申请人： Richard D. Gitlin , Edmond Y. Ho , Howard C. Meadors, Jr. , Stephen B. Weinstein
发明人： Richard D. Gitlin , Edmond Y. Ho , Howard C. Meadors, Jr. , Stephen B. Weinstein
IPC分类号： H03H15/00 , H04B3/04 , H04L7/00 , H04L7/02 , H04L7/04 , H04L7/10 , H04L27/01
CPC分类号： H04L7/10 , H04L27/01 , H04L7/007 , H04L7/046
摘要： In a multipoint data communication system using quadrature-amplitude modulation, a master modem (20) and a plurality of tributary modems (11a, 11b . . . 11n) are interconnected via respective transmission channels (13a, 13b . . . 13n, 16). Adaptive equalizer circuitry (55, 56) in the master modem equalizes the channel from a particular tributary by multiplying samples of signals received from the tributary by an ensemble of tap coefficients associated with the tributary. The tap coefficient ensembles for each tributary are stored in a memory (91) from which they are retrieved at the start of transmission from that tributary. Timing-acquisition circuitry (29) within the master modem adjusts the phase of the latter's sampling circuitry (23, 27) at the start of transmission from a given tributary so that the received signals are sampled at the correct time points. In particular, a timing acquisition signal having spectral components only within the non-rolloff region of the equalized baseband-equivalent transfer function is transmitted by the tributary. The master samples and equalizes the received timing acquisition signal to form a succession of timing acquisiton equalizer outputs. The time by which the operation of the sampling circuitry is to be advanced or retarded is determined as a trigonometric function of two successive ones of the timing acquisition equalizer outputs. The timing acquisition signal is illustratively a double-dotting pattern having a four-symbol-interval period. That period is integrally related to the carrier frequency. This allows the samples needed in order to begin forming the timing acquisition equalizer outputs to be generated by replicating the samples taken over only four symbol intervals.
摘要翻译：在使用正交幅度调制的多点数据通信系统中，主调制解调器（20）和多个支路调制解调器（11a，11b，...，11n）经由各个传输信道（13a，13b，...，13n，16）互连，。主调制解调器中的自适应均衡器电路（55,56）通过将从支路接收的信号的采样乘以与支路相关联的抽头系数的整体来均衡来自特定支路的信道。每个支流的抽头系数集合存储在从该支流的传输开始时从其中检索它们的存储器（91）中。主调制解调器内的定时采集电路（29）在给定支路的发送开始时调整后者的采样电路（23,27）的相位，使得接收的信号在正确的时间点进行采样。特别地，仅在均衡的基带等效传递函数的非滚降区域内具有频谱分量的定时获取信号由支流传输。主机采样并均衡接收到的定时采集信号，形成一系列定时采集均衡器输出。将采样电路的操作提前或延迟的时间确定为两个连续的定时获取均衡器输出的三角函数。定时获取信号示例性地是具有四符号间隔周期的双点图案。这个时期与载波频率是一体的。这允许为了开始形成定时获取均衡器输出而需要的样本，通过复制仅在四个符号间隔所取的样本来产生。

2. 发明授权

US4412341A Interference cancellation method and apparatus 失效
标题翻译：干扰消除方法和装置
公开(公告)号：US4412341A
公开(公告)日：1983-10-25
申请号：US322517
申请日：1981-11-18
申请人： Allen Gersho , Edmond Y. Ho , Richard D. Gitlin , Victor B. Lawrence , Tong L. Lim
发明人： Allen Gersho , Edmond Y. Ho , Richard D. Gitlin , Victor B. Lawrence , Tong L. Lim
IPC分类号： H04L27/00 , H04B3/20 , H04B15/00 , H04L27/01 , H04B3/14
CPC分类号： H04L27/01 , H04B15/00
摘要： Weighted sums of samples of an interference-corrupted data signal are generated to form phase-compensated, symbol-spaced samples. The interference-corrupted signal is at the same time subjected to conventional adaptive equalization and is otherwise processed so as to form tentative decisions as to the transmitted data. Cancellation signals representing the interference components of the phase-compensated samples are generated by forming respective weighted sums of the tentative decisions and each cancellation signal is combined with a respective phase-compensated sample to provide cancelled samples from which final data decisions are made. The weighting coefficients used to form the phase-compensated samples and the cancellation signals are adaptively updated in response to error signals derived from the difference between each cancelled sample and the corresponding final decision.
摘要翻译：产生干扰损坏的数据信号的加权加权和，以形成相位补偿的符号间隔样本。干扰损坏的信号同时经历常规的自适应均衡，并且被处理，以便形成关于发送的数据的暂定决定。表示相位补偿样本的干扰分量的消除信号通过形成临时判定的各自的加权和来产生，并且将每个消除信号与相应的相位补偿样本组合，以提供取消的取样，从中作出最终的数据决定。用于形成相位补偿采样的加权系数和消除信号根据从每个取消的采样与相应的最终决策之间的差异导出的误差信号自适应地更新。

3. 发明授权

US5438254A Phase difference measuring device 失效
标题翻译：相差测量装置
公开(公告)号：US5438254A
公开(公告)日：1995-08-01
申请号：US282180
申请日：1994-07-29
申请人： Edmond Y. Ho , Fu-chin Yang , Jung-lung Lin
发明人： Edmond Y. Ho , Fu-chin Yang , Jung-lung Lin
IPC分类号： G01R23/20 , G01R25/08 , G01R31/30 , G01R23/02
CPC分类号： G01R23/20 , G01R25/08 , G01R31/30
摘要： A phase difference measuring device includes a phase detector, a low-pass filter/voltage controlled oscillator, a reference signal selector for selecting either an internal reference signal or an external reference signal as a reference signal, a phase comparator for comparing an undertest signal with the selected reference signal and obtaining a phase difference between the two compared signal. The internal reference signal is selected when the undertest signal is a jittering signal, and the external reference signal is selected when the undertest signal is a wandering signal. The undertest signal, the selected reference signal, and a relatively high frequency clock signal from external are sent to the phase comparator and a phase difference between the undertest signal and the selected reference signal is counted by the relatively high frequency clock signal.
摘要翻译：相位差测量装置包括相位检测器，低通滤波器/压控振荡器，用于选择内部参考信号或外部参考信号作为参考信号的参考信号选择器，将相关信号与所选择的参考信号并获得两个比较信号之间的相位差。当承载信号为抖动信号时，选择内部参考信号，当承载信号为漫游信号时，选择外部参考信号。承受信号，所选择的参考信号和来自外部的相对高频时钟信号被发送到相位比较器，并且通过相对高频时钟信号对该信号和所选参考信号之间的相位差进行计数。

4. 发明授权

US4285061A Equalizer sample loading in voiceband data sets 失效
标题翻译：均衡器样本加载在语音带数据集中
公开(公告)号：US4285061A
公开(公告)日：1981-08-18
申请号：US75647
申请日：1979-09-14
申请人： Edmond Y. Ho
发明人： Edmond Y. Ho
IPC分类号： H03H15/00 , H03H21/00 , H04B3/10 , H04L7/02 , H04L7/04 , H04L27/01 , H04B3/14
CPC分类号： H04L27/01 , H04L7/046 , H04L2007/047 , H04L7/007
摘要： In a multipoint data communication system using quadrature-amplitude modulation, a master modem (20) and a plurality of tributary modems (11a, 11b . . . 11n) are interconnected via respective transmission channels (13a, 13b . . . 13n, 16). Adaptive equalizer circuitry (55, 56) in the master modem equalizes the channel from a particular tributaryly multiplying samples of signals received from the tributary by an ensemble of tap coefficients associated with the tributary. The tap coefficient ensembles for each tributary are stored in a memory (91) from which they are retrieved at the start of transmission from that tributary. Timing-acquisition circuitry (29) within the master modem adjusts the phase of the letter's sampling circuitry (23, 27) at the start of transmission from a given tributary so that the received signals are sampled at the correct time points. In particular, a timing acquisition signal having spectral components only within the non-rolloff region of the equalized baseband-equivalent transfer function is transmitted by the tributary. The master samples and equalizes the received timing acquisition signal to form a succession of timing acquisition equalizer outputs. The time by which the operation of the sampling circuitry is to be advanced or retarded is determined as a trigonometric function of two successive ones of the timing acquisition equalizer outputs. The timing acquisition signal is illustratively a double-dotting pattern having a four-symbol-interval period. That period is integrally related to the carrier frequency. This allows the samples needed in order to begin forming the timing acquisition equalizer outputs to be generated by replicating the samples taken over only four symbol intervals.
摘要翻译：在使用正交幅度调制的多点数据通信系统中，主调制解调器（20）和多个支路调制解调器（11a，11b，...，11n）经由各个传输信道（13a，13b，...，13n，16）互连，。主调制解调器中的自适应均衡器电路（55,56）使从支路接收到的信号的特定辅助乘法样本与由支路相关联的抽头系数的整体来均衡信道。每个支流的抽头系数集合存储在从该支流的传输开始时从其中检索它们的存储器（91）中。在主调制解调器内的定时采集电路（29）在给定支路的发射开始时调整字母的采样电路（23,27）的相位，使得接收的信号在正确的时间点进行采样。特别地，仅在均衡的基带等效传递函数的非滚降区域内具有频谱分量的定时获取信号由支流传输。主机采样并均衡接收到的定时采集信号，以形成一系列定时获取均衡器输出。将采样电路的操作提前或延迟的时间确定为两个连续的定时获取均衡器输出的三角函数。定时获取信号示例性地是具有四符号间隔周期的双点图案。这个时期与载波频率是一体的。这允许为了开始形成定时获取均衡器输出而需要的样本，通过复制仅在四个符号间隔所取的样本来产生。

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