公开(公告)号：US5982818A

公开(公告)日：1999-11-09

申请号：US779510

申请日：1997-01-07

申请人： Daniel J. Krueger ,  Joao R. Cruz

发明人： Daniel J. Krueger ,  Joao R. Cruz

IPC分类号： H04L27/00 ,  H03M13/23 ,  H04B3/04 ,  H04B7/005 ,  H04L5/12 ,  H04L25/497 ,  H04L27/36

CPC分类号： H03M13/256 ,  H04L27/3416

摘要： A method of design and implementation of trellis codes for intersymbol interference channels is provided wherein a set of input vectors is mapped to a set of output vectors comprising the steps of forming a minimized basis having a set of minimized basis vectors configured for a set of channel output signals corresponding to the set of output vectors; selecting the smallest member of the set of minimized basis vectors as a coset vector; forming a partition basis by adding the coset vector to at least one member of the set of the minimized basis vectors; and forming a subsequent minimized basis from the partition basis. These codes circumvent the necessity for intersymbol interference removal, thereby reducing equalization complexity.

摘要翻译： 提供了一种用于符号间干扰信道的网格码的设计和实现的方法，其中一组输入向量被映射到一组输出向量，包括以下步骤：形成具有被配置用于一组信道的最小化基向量的最小化基 对应于该组输出向量的输出信号; 选择最小化基向量集合中的最小成员作为陪集向量; 通过将所述陪集向量加到所述最小化基向量集合中的至少一个成员来形成分区基; 以及从分区基础形成随后的最小化基础。 这些代码规避了符号间干扰去除的必要性，从而降低均衡复杂度。

公开(公告)号：US5621580A

公开(公告)日：1997-04-15

申请号：US296512

申请日：1994-08-26

申请人： Joao R. Cruz ,  Daniel J. Krueger

发明人： Joao R. Cruz ,  Daniel J. Krueger

IPC分类号： G11B5/09 ,  G11B20/10 ,  G11B20/14

CPC分类号： G11B20/1492 ,  G11B20/10009 ,  G11B5/09

摘要： A digital magnetic recording system comprises an input for a binary-encoded data signal comprising two symbols. The binary signal is converted, using a binary-to-ternary convolutional encoder, to a ternary signal comprising three symbols. The ternary signal is recorded onto a magnetic medium wherein two symbols are recorded using conventional saturation recording and a third symbol is recorded using a nonoriented state. The nonoriented state results from the application to the medium of a high-frequency oscillating magnetic flux. The recorded signal is subsequently reproduced and equalized. A Viterbi algorithm is used to convert the equalized signal back to the original binary signal which is then output from the system.

摘要翻译： 数字磁记录系统包括用于二进制编码数据信号的输入，包括两个符号。 使用二进制到三进制卷积编码器将二进制信号转换成包括三个符号的三进制信号。 将三元信号记录在磁性介质上，其中使用常规饱和记录记录两个符号，并且使用非取向状态记录第三符号。 非取向状态是由应用于高频振荡磁通的介质而产生的。 记录的信号随后被再现和均衡。 维特比算法用于将均衡的信号转换回原来的二进制信号，然后从系统输出。

公开(公告)号：US07026952B2

公开(公告)日：2006-04-11

申请号：US10371624

申请日：2003-02-21

申请人： Daniel J. Krueger

发明人： Daniel J. Krueger

IPC分类号： G01V3/00

CPC分类号： G01V11/002

摘要： A downhole telemetry system and method using discrete multi-tone modulation having repeated symbols. The system includes a surface receiver, a cable, and a downhole transmitter coupled to the surface receiver via the cable. The transmitter communicates a time-domain signal to the receiver. The time-domain signal has a cyclic prefix for a symbol at least as long as the length of the symbol. The system may alternatively include the time-domain signal having a symbol followed immediately by a copy of the symbol. The method includes receiving a time-domain signal carrying desired information at specific frequencies. The signal has at least one symbol. The method includes prepending a cyclic prefix having first length to the beginning of the symbol. The cyclic prefix has a second length no longer than the first length. The method may alternatively include appending a copy of the at least one symbol to the end of the at least one symbol.

摘要翻译： 一种使用具有重复符号的离散多音调制的井下遥测系统和方法。 该系统包括经由电缆耦合到表面接收器的表面接收器，电缆和井下发射器。 发射机向接收机传送时域信号。 时域信号具有至少与符号的长度一样长的符号的循环前缀。 该系统可以替代地包括具有跟随符号副本的符号的时域信号。 该方法包括在特定频率下接收携带期望信息的时域信号。 信号至少有一个符号。 该方法包括将具有第一长度的循环前缀预先添加到符号的开头。 循环前缀具有不长于第一长度的第二长度。 该方法可以替代地包括将至少一个符号的副本附加到至少一个符号的末尾。

公开(公告)号：US20080173481A1

公开(公告)日：2008-07-24

申请号：US12016735

申请日：2008-01-18

申请人： Clive D. Menezes ,  Daniel J. Krueger

发明人： Clive D. Menezes ,  Daniel J. Krueger

IPC分类号： E21B47/00

CPC分类号： E21B10/62 ,  E21B47/00

摘要： Disclosed drilling systems offer multiple methods providing access to the open borehole without first tripping the drill string. In some embodiments, a drill bit has a tool port that is blocked by a plug during normal drilling operations. When a tool is deployed through the interior of the drill string, the tool port opens, enabling the tool to enter the borehole beneath the drill string and perform logging or sampling operations. The plug may be attached to the drill bit by a hinge or pivot, or alternatively, the plug may be discarded and a replacement seated in place after the tool is retracted into the drill string. In other embodiments, the drill bit itself is detachable, allowing the bit to be parked in the hole or in a side bore. If desired, the bit can be re-attached by lowering the drill string to the bottom of the hole.

摘要翻译： 公开的钻井系统提供多种方法，提供对开放井眼的通路，而不首先跳闸钻柱。 在一些实施例中，钻头具有在正常钻孔操作期间被塞子阻挡的工具端口。 当工具通过钻柱的内部部署时，工具端口打开，使工具能够进入钻柱下方的钻孔，并执行测井或采样操作。 插头可以通过铰链或枢轴连接到钻头，或者替代地，在工具缩回到钻柱中之后，塞子可以被丢弃并且置换就位。 在其他实施例中，钻头本身是可拆卸的，允许钻头停放在孔或侧孔中。 如果需要，可以通过将钻柱降至孔的底部来重新安装钻头。