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    Equalization of modulated data signals utilizing tentative and final decisions and replication of non-linear channel distortion
    11.
    发明授权
    Equalization of modulated data signals utilizing tentative and final decisions and replication of non-linear channel distortion 失效
    调制数据信号的均衡利用临时和最终决策以及复制非线性信道失真

    公开(公告)号：US4615038A

    公开(公告)日：1986-09-30

    申请号：US617979

    申请日：1984-06-06

    Applicant: Tong L. Lim, deceased ,  by Keung-Yi P. Yu, executor ,  Richard D. Gitlin

    Inventor： Tong L. Lim, deceased ,  by Keung-Yi P. Yu, executor ,  Richard D. Gitlin

    IPC: H04L27/01 ,  H04B3/04

    CPC classification number: H04L27/01

    Abstract: Apparatus and a technique for equalizing non-linear distortion in a received modulated data signal by (1) forming tentative decisions as to the values of data symbols represented by the signal preferably using a receiver including a conventional linear equalizer, (2) constructing a replica of the non-linear distortion in response to the tentative decisions, and (3) forming a final decision as to the data symbol values in response to signals including the replica. If desired, the final decisions can also be stored and fed back to the processor which forms the replica, so that the replica is a joint function of past final decisions and future tentative decisions regarding the data symbols represented by the signal samples. The present invention provides increased accuracy by using tentative decisions rather than input samples to form the non-linear distortion replica.

    Abstract translation: 一种用于通过以下步骤来均衡接收的调制数据信号中的非线性失真的装置和技术：（1）优选地使用包括常规线性均衡器的接收机来形成关于由信号表示的数据符号的值的暂定决定，（2）构建副本 的响应于暂定决定的非线性失真，以及（3）响应于包括副本的信号，形成关于数据符号值的最终决定。 如果需要，最终决定也可以被存储并反馈到形成副本的处理器，使得副本是关于由信号样本表示的数据符号的过去最终决定和将来的暂定决定的联合功能。 本发明通过使用暂定决定而不是输入样本来形成非线性失真副本来提供增加的精度。

    Interference cancellation method and apparatus
    12.
    发明授权
    Interference cancellation method and apparatus 失效
    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

    Applicant: Allen Gersho ,  Edmond Y. Ho ,  Richard D. Gitlin ,  Victor B. Lawrence ,  Tong L. Lim

    Inventor： Allen Gersho ,  Edmond Y. Ho ,  Richard D. Gitlin ,  Victor B. Lawrence ,  Tong L. Lim

    IPC: H04L27/00 ,  H04B3/20 ,  H04B15/00 ,  H04L27/01 ,  H04B3/14

    CPC classification number: H04L27/01 ,  H04B15/00

    Abstract: 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.

    Abstract translation: 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。

    Timing acquisition in voiceband data sets
    13.
    发明授权
    Timing acquisition in voiceband data sets 失效
    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

    Applicant: Richard D. Gitlin ,  Edmond Y. Ho ,  Howard C. Meadors, Jr. ,  Stephen B. Weinstein

    Inventor： Richard D. Gitlin ,  Edmond Y. Ho ,  Howard C. Meadors, Jr. ,  Stephen B. Weinstein

    IPC: H03H15/00 ,  H04B3/04 ,  H04L7/00 ,  H04L7/02 ,  H04L7/04 ,  H04L7/10 ,  H04L27/01

    CPC classification number: H04L7/10 ,  H04L27/01 ,  H04L7/007 ,  H04L7/046

    Abstract: 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.

    Abstract translation: 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。

    Minimally invasive networked surgical system and method
    15.
    发明授权
    Minimally invasive networked surgical system and method 有权
    微创网络外科手术系统及方法

    公开(公告)号：US08923773B1

    公开(公告)日：2014-12-30

    申请号：US14099428

    申请日：2013-12-06

    Applicant: Richard D. Gitlin ,  Gabriel E. Arrobo ,  Thomas P. Ketterl

    Inventor： Richard D. Gitlin ,  Gabriel E. Arrobo ,  Thomas P. Ketterl

    IPC: H04B7/00 ,  A61B1/00 ,  A61B5/00 ,  H04W40/00 ,  H04M1/00

    CPC classification number: A61B1/00016 ,  A61B1/00006 ,  A61B5/0022 ,  A61B5/0024 ,  A61B5/07 ,  A61B17/00234 ,  A61B17/32 ,  A61B2017/00212 ,  H04L67/125 ,  H04W8/22 ,  H04W40/00 ,  H04W76/10 ,  H04W84/12

    Abstract: A system for performing non-invasive networked medical procedures including a number of in vivo medical devices, a communication path between at least two of the devices, an ex vivo control unit to control the behavior of the devices, and a wireless communication path between the control unit and at least one of the devices. An associated method for performing non-invasive networked medical procedures is also provided. Further included is a simulation method that utilizes accurate electromagnetic field simulations, using a software based test bench, to determine the maximum allowable transmitted power levels from in vivo devices to achieve a required bit error rates (BER) at an in vivo or ex vivo node (receiver) while maintaining the specific absorption rate (SAR) under a required threshold.

    Abstract translation: 一种用于执行非侵入式联网医疗程序的系统，包括多个体内医疗设备，至少两个设备之间的通信路径，用于控制设备的行为的离体控制单元以及控制设备的行为之间的无线通信路径 控制单元和至少一个设备。 还提供了用于执行非侵入式联网医疗程序的相关方法。 还包括一种仿真方法，利用精确的电磁场模拟，使用基于软件的测试台来确定体内器件的最大允许发射功率电平，以在体内或离体节点处实现所需的误码率（BER） （接收器），同时将比吸收率（SAR）保持在所需阈值以下。

    System and method for optimizing spectral efficiency using time-frequency-code slicing
    16.
    发明授权
    System and method for optimizing spectral efficiency using time-frequency-code slicing 失效
    使用时频码分片优化频谱效率的系统和方法

    公开(公告)号：US6018528A

    公开(公告)日：2000-01-25

    申请号：US234197

    申请日：1994-04-28

    Applicant: Richard D. Gitlin ,  Zygmunt Haas ,  Mark J. Karol ,  Clark Woodworth

    Inventor： Richard D. Gitlin ,  Zygmunt Haas ,  Mark J. Karol ,  Clark Woodworth

    IPC: H04B7/26 ,  H04J3/16 ,  H04J4/00 ,  H04J13/16

    CPC classification number: H04W28/16 ,  H04B7/2618 ,  H04J13/16 ,  H04J4/00 ,  H04L5/0005 ,  H04L5/0016 ,  H04W72/0466

    Abstract: A system and method for optimizing usage of a communications transmission medium. The transmission medium may be sliced into time and frequency domains so as to create time-frequency slices for assignment to users having varying access rates and user-application requirements. Through scheduling of the various speed users within the frequency and time domains, the system and method can efficiently allocate and make use of the available spectrum, thereby accommodating higher rate users requiring greater bandwidths and time slot assignments while still preserving cost-efficient access for lower speed users. Depending on the signal modulation scheme, the time-frequency slices may be allocated on non-contiguous frequency bands. The system and method is also applicable to code-division multiple access (CDMA) techniques by slicing the available code space along time-code domains, frequency-code domains or, in three dimensions, along time-frequency-code domains. Users may be efficiently scheduled based on code space requirements so as to optimize use of the communication medium.

    Abstract translation: 一种用于优化通信传输介质的使用的系统和方法。 传输介质可以被切片成时域和频域，以便创建用于分配给具有不同接入速率和用户应用需求的用户的时频片。 通过对频域和时域内的各种速度用户的调度，系统和方法可以有效地分配和利用可用频谱，从而适应需要更大带宽和时隙分配的较高速率用户，同时仍然保持低成本的低成本接入 高速用户。 根据信号调制方案，可以在非连续频带上分配时频片。 该系统和方法也可应用于码分多址（CDMA）技术，通过沿着时间码域，频码域或三维沿着时间 - 频码域分割可用码空间。 可以基于代码空间要求有效地调度用户，以便优化通信介质的使用。

    Timing acquisition in voiceband data sets
    19.
    发明授权
    Timing acquisition in voiceband data sets 失效
    语音带数据集中的时序采集

    公开(公告)号：US4416015A

    公开(公告)日：1983-11-15

    申请号：US335730

    申请日：1981-12-30

    Applicant: Richard D. Gitlin

    Inventor： Richard D. Gitlin

    IPC: H04L7/00 ,  H04L7/02 ,  H04L7/04 ,  H04L7/10 ,  H04L27/01 ,  H03H15/00

    CPC classification number: H04L7/10 ,  H04L27/01 ,  H04L2007/047 ,  H04L7/007

    Abstract: In a multipoint data communication system using quadrature-amplitude modulation, a master modem and a plurality of tributary modems are interconnected via respective transmission channels. Adaptive equalizer circuitry 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 from which they are retrieved at the start of transmission from that tributary. Timing acquisition circuitry within the master modem adjusts the phase of the latter's sampling circuitry 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 is transmitted by the tributary. The master samples and equalizes the received timing acquisition signal to form a succession of timing acquisition equalizer outputs. Each timing acquisition equalizer output is multiplied by its complex conjugate to form a timing acquisition envelope sample. The time by which the operation of the sampling circuitry is to be advanced or retarded is determined as a trigonometric function of successive timing acquisition envelope samples.

    Abstract translation: 在使用正交幅度调制的多点数据通信系统中，主调制解调器和多个支路调制解调器通过相应的传输信道相互连接。 主调制解调器中的自适应均衡器电路通过将从支流接收的信号的采样乘以与支流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合并存储在从该支流的传输开始时从其中检索的存储器中。 主调制解调器内的定时采集电路在给定支路的传输开始时调整后者的采样电路的相位，使接收的信号在正确的时间点采样。 特别地，定时获取信号由支流传输。 主器件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。 每个定时获取均衡器输出乘以其复共轭以形成定时采集包络采样。 将采样电路的操作提前或延迟的时间确定为连续定时采集包络样本的三角函数。

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