公开(公告)号：US07173972B2

公开(公告)日：2007-02-06

申请号：US09816810

申请日：2001-03-23

申请人： John S. Thomson ,  Paul J. Hustad ,  Ardavan M. Tehrani ,  Jeffrey M. Gilbert ,  William J. McFarland ,  Lars E. Thon ,  Yi-Hsiu Wang

发明人： John S. Thomson ,  Paul J. Hustad ,  Ardavan M. Tehrani ,  Jeffrey M. Gilbert ,  William J. McFarland ,  Lars E. Thon ,  Yi-Hsiu Wang

IPC分类号： H04K1/10 ,  H04L27/28

CPC分类号： H04L25/067 ,  H03M13/25 ,  H03M13/3961 ,  H03M13/41 ,  H03M13/6325 ,  H03M13/6362 ,  H04K3/228 ,  H04L1/005 ,  H04L1/0054 ,  H04L27/38

摘要： A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued parameters to provide results superior to hard decision decoding. Rather than applying a hard 0-1 function to the QAM data, the system uses a non-stepped linear or curved transfer function to assign values to the bits. In another aspect, a system differentiates between data bits based on their estimated reliability, giving more emphasis to decoding reliable bits than unreliable bits using any of a variety of techniques. By differentiating between god and bad bits and de-emphasizing or ignoring unreliable bits, the system can provide a significant reduction in uncorrectable errors and packet loss.

摘要翻译： 维特比解码系统将接收的QAM星座中的比特解释为多值参数，而不是二进制值参数。 它使用这些多值参数来执行维特比算法，以提供优于硬判决解码的结果。 系统使用非阶梯线性或弯曲传递函数来向位指定值，而不是将硬0-1函数应用于QAM数据。 在另一方面，一种系统基于其估计的可靠性来区分数据比特，更多地强调使用各种技术中的任何一种来解码可靠比特比不可靠比特。 通过区分神和坏位，并且不强调或忽略不可靠比特，系统可以显着减少不可校正的错误和分组丢失。

公开(公告)号：US07027530B2

公开(公告)日：2006-04-11

申请号：US09833749

申请日：2001-04-11

申请人： William McFarland ,  Teresa H. Meng ,  Paul J. Husted ,  John S. Thomson

发明人： William McFarland ,  Teresa H. Meng ,  Paul J. Husted ,  John S. Thomson

IPC分类号： H04L27/06

CPC分类号： H04L1/0054 ,  H03G3/3052 ,  H04L27/2605 ,  H04L27/2647

摘要： The present invention provides a method of and an apparatus for changing the gain of a receive path amplifier during the middle of a packet transmission, and particularly changing the gain during a guard interval between a symbol with encoding bits disposed therein and a subsequent data symbol encoded in a manner corresponding to the encoding bits.

公开(公告)号：US07865150B2

公开(公告)日：2011-01-04

申请号：US11768783

申请日：2007-06-26

申请人： William J. McFarland ,  Keith K. Onodera ,  Arie Shor ,  David K. Su ,  Manolis Terrovitis ,  John S. Thomson ,  Masoud Zaragari

发明人： William J. McFarland ,  Keith K. Onodera ,  Arie Shor ,  David K. Su ,  Manolis Terrovitis ,  John S. Thomson ,  Masoud Zaragari

IPC分类号： H04B1/44

CPC分类号： H04W88/06 ,  H03H7/0153 ,  H03H7/48 ,  H04B7/0602 ,  H04B7/0805 ,  H04W84/12

摘要： A dual band radio is constructed using a primary and secondary transceiver. The primary transceiver is a complete radio that is operational in a stand alone configuration. The secondary transceiver is a not a complete radio and is configured to re-use components such as fine gain control and fine frequency stepping of the primary transceiver to produce operational frequencies of the secondary transceiver. The primary transceiver acts like an intermediate frequency device for the secondary transceiver. Switches are utilized to divert signals to/from the primary transceiver from/to the secondary transceiver. The switches are also configured to act as gain control devices. Antennas are selected using either wideband or narrowband antenna switches that are configured as a diode bridge having high impedance at operational frequencies on control lines that bias the diodes.

摘要翻译： 使用主要和次要收发器构建双频无线电。 主收发器是在独立配置中可操作的完整无线电。 辅助收发器不是完整的无线电设备，并被配置为重新使用诸如主收发器的精细增益控制和精细频率步进的组件来产生次级收发器的操作频率。 主收发器像次级收发器的中频设备一样工作。 开关用于将信号从/从主收发器转发到/从辅助收发器。 开关还被配置为用作增益控制装置。 使用宽带或窄带天线开关选择天线，该开关被配置为在偏置二极管的控制线上的工作频率处具有高阻抗的二极管桥。

公开(公告)号：US07792052B1

公开(公告)日：2010-09-07

申请号：US12236818

申请日：2008-09-24

申请人： John S. Thomson ,  William J. McFarland

发明人： John S. Thomson ,  William J. McFarland

IPC分类号： H04J1/16

CPC分类号： H04L25/022 ,  H04L5/005 ,  H04L25/0224 ,  H04L27/2659 ,  H04L27/266 ,  H04L27/2662 ,  H04L27/2695

摘要： A radio communication device is tested by forwarding relevant signal characteristic data derived at the physical (PHY) layer to the media access control (MAC) layer for processing, analysis and feedback to the radio circuit to improve performance. The relevant signal characteristics are forwarded to the MAC within (appended to) a data packet. Thus, the relevant signal characteristic is forwarded to the MAC along an existing data path (a path originally designed to transfer the receive frame only, but now transfers the combined receive frame with the attached radio characteristic). The radio characteristic may be used for testing and/or tuning the radio circuit. In one embodiment, the radio characteristic is a frequency domain representation of a received signal. The radio is tuned based on a channel estimate derived from comparison of frequency domain representations of transmitted and received signals.

摘要翻译： 通过将在物理（PHY）层导出的相关信号特征数据转发到媒体访问控制（MAC）层来进行无线电通信设备的测试，以对无线电电路进行处理，分析和反馈以提高性能。 相关信号特性被转发到数据包（附加到）内的MAC。 因此，相关信号特性沿着现有数据路径（最初设计用于传送接收帧的路径，但是现在传输具有附加的无线电特征的组合的接收帧）被转发到MAC。 无线电特性可用于测试和/或调谐无线电电路。 在一个实施例中，无线电特性是接收信号的频域表示。 基于从发送和接收信号的频域表示的比较导出的信道估计来调谐无线电。

公开(公告)号：US3567040A

公开(公告)日：1971-03-02

申请号：US3567040D

申请日：1968-06-10

申请人： JOHN S THOMSON

发明人： THOMSON JOHN S

IPC分类号： B63B27/04 ,  B66C1/10 ,  B66C13/08 ,  B66C23/60 ,  B66C23/06

CPC分类号： B63B27/04 ,  B66C1/101 ,  B66C13/08 ,  B66C23/605

摘要： A ship''s crane has a jib which is adapted for luffing and slewing movements, and from which is suspended a load-handling device, particularly for containers. The load-handling device is in two portions, with a motor to rotate the two portions relative to each other to position the load accurately. The crane has a single load cable which is reeved about the jib head and the upper of the two portions in such a way that, in addition to resisting reactionary rotation of the upper portion of the loadhandling device, the device is enabled to maintain its horizontal position irrespective of the angle of elevation of the jib or list of the ship.

公开(公告)号：US3299452A

公开(公告)日：1967-01-24

申请号：US43566465

申请日：1965-02-26

申请人： GEORGE W HAYCOCK ,  JOHN S THOMSON

发明人： HAYCOCK GEORGE W

IPC分类号： B63B23/04

CPC分类号： B63B23/26 ,  B63B23/06 ,  B63B23/16