公开(公告)号：US20120308239A1

公开(公告)日：2012-12-06

申请号：US13486880

申请日：2012-06-01

申请人： Samir S. Sheth ,  Wayne E. Walters ,  John C. Wissel ,  Kelvin Hui Xu ,  Brian E. Royal ,  Kelly P. Hawkins

发明人： Samir S. Sheth ,  Wayne E. Walters ,  John C. Wissel ,  Kelvin Hui Xu ,  Brian E. Royal ,  Kelly P. Hawkins

IPC分类号： H04B10/10

CPC分类号： H04B10/1125 ,  H04B10/118

摘要： Systems and methods enabling nodes of a free-space optical communication system to maintain pointing alignment of their transmitted optical beams. A first node scans its optical antenna through a path centered on a target direction. The second node captures signal strength measurements during the scan, and sends those measurements to the first node. The first node separately measures signal strength of the optical signal being received from the second node. The two sources of information (locally measured and remotely measured) are used to compute angular errors. The first node uses the angular errors to adjust the target direction of its optical antenna. The second node may employ the same method (with roles reversed) to adjust its target direction. By cycling back and forth between to the two nodes, the target directions of the two nodes maintain alignment in spite of movements of the structures on which they are mounted.

摘要翻译： 允许自由空间光通信系统的节点保持其发射光束的指向对准的系统和方法。 第一个节点通过以目标方向为中心的路径扫描其光学天线。 第二个节点捕获扫描期间的信号强度测量，并将这些测量值发送到第一个节点。 第一节点分别测量从第二节点接收的光信号的信号强度。 信息的两个来源（本地测量和远程测量）用于计算角度误差。 第一节点使用角度误差调整其光学天线的目标方向。 第二节点可以使用相同的方法（用角色颠倒）来调整其目标方向。 通过在两个节点之间来回循环，尽管它们被安装在其上的结构的移动，两个节点的目标方向保持对准。

公开(公告)号：US4922530A

公开(公告)日：1990-05-01

申请号：US348156

申请日：1989-05-03

申请人： John B. Kenney ,  Charles E. Rohrs ,  Wayne E. Walters

发明人： John B. Kenney ,  Charles E. Rohrs ,  Wayne E. Walters

IPC分类号： H04B3/23

CPC分类号： H04B3/237 ,  H04B3/238

摘要： An adaptive transversal filter is characterized by a first adaptive filter for generating a plurality of estimated impulse response coefficients representing an impulse response of a transmission path. An averaging circuit is coupled with the first adaptive filter, and generates a plurality of average estimated impulse response coefficients having values in accordance with the average values over a most recent time interval of associated ones of the estimated impulse response coefficients, and a second adaptive filter receives the average estimated coefficients. The average estimated impulse response coefficients more closely represent and have less variance with respect to the actual impulse response of the transmission path than do the estimated coefficients, and the second filter generates an estimate of an echo signal through a process including convolution of the average estimated coefficients and an input signal. The adaptive transversal filter is particularly suited for use in an adaptive hybrid circuit.

摘要翻译： 自适应横向滤波器的特征在于第一自适应滤波器，用于产生表示传输路径的脉冲响应的多个估计的脉冲响应系数。 平均电路与第一自适应滤波器耦合，并且产生多个平均估计脉冲响应系数，该平均估计脉冲响应系数具有与所估计的脉冲响应系数中相关联的最近时间间隔上的平均值相对应的值，以及第二自适应滤波器 接收平均估计系数。 平均估计脉冲响应系数相对于传送路径的实际脉冲响应更接近地表示和具有比估计的系数更小的方差，并且第二滤波器通过包括平均估计的平均值的卷积的处理生成回波信号的估计 系数和输入信号。 自适应横向滤波器特别适用于自适应混合电路。

公开(公告)号：US4815124A

公开(公告)日：1989-03-21

申请号：US66606

申请日：1987-06-26

申请人： Blaine T. Bowers ,  Wayne E. Walters

发明人： Blaine T. Bowers ,  Wayne E. Walters

IPC分类号： H04M7/06 ,  H04Q1/38

CPC分类号： H04Q1/38

摘要： An improved DX circuit may be connected to signaling and reference leads of a DX signaling link, without need to balance the internal impedance of the DX circuit against that of the external DX signaling link. The DX circuit senses the magnitude and direction of current flow on the leads, and operates on the principle that when a near end signaling circuit is on-hook, a positive current flow indicates that a far end signaling circuit is off-hook and a current flow of zero indicates that it is on-hook, while if the near end signaling circuit is off-hook, a negative current flow indicates that the far end signaling circuit is on-hook and a current flow of zero indicates that it is off-hook. The arrangement allows the DX circuit to properly function irrespective of the resistive load presented by the DX signaling link. To enable the DX circuit to function with various capacitive loads, it also detects the rate of change of current on the leads and, in the absence of a change in status of the near end signaling circuit, provides an output representative of a change in the on-hook/off-hook status of the far end signaling circuit, immediately upon detecting a sufficient rate of change.

摘要翻译： 改进的DX电路可以连接到DX信号链路的信令和参考引线，而不需要平衡DX电路的内部阻抗与外部DX信令链路的内部阻抗。 DX电路检测引线上电流的大小和方向，并且原理是当近端信号电路挂机时，正电流指示远端信号电路摘机，电流 零流程表示它是挂机的，而如果近端信令电路摘机，则负电流指示远端信令电路挂机，当前的零电流表示其为“ 钩。 该布置允许DX电路正确地工作，而与DX信号链路呈现的电阻负载无关。 为了使DX电路能够与各种容性负载一起工作，它还检测引线上的电流变化率，并且在没有近端信号电路的状态改变的情况下，提供代表变化的输出 在检测到足够的变化率时，立即进行远端信号电路的挂机/摘机状态。