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    System and method for tracking vehicles and containers
    11.
    发明授权
    System and method for tracking vehicles and containers 有权
    跟踪车辆和集装箱的系统和方法

    公开(公告)号：US07755541B2

    公开(公告)日：2010-07-13

    申请号：US12028894

    申请日：2008-02-11

    申请人： David S. Wisherd ,  Robert W. Boyd ,  Tom Richardson ,  Santiago Romero ,  Michael A. Wohl

    发明人： David S. Wisherd ,  Robert W. Boyd ,  Tom Richardson ,  Santiago Romero ,  Michael A. Wohl

    IPC分类号： G01S5/14 ,  H04L12/58

    CPC分类号： G01S19/07 ,  G01S19/09

    摘要： A location system for tracking assets within a terminal includes a Differential Global Positioning System (DGPS) reference receiver within the terminal that receives GPS signals and generates DGPS correction data. In one aspect, a roving receiver unit is carried by an asset to be tracked within the terminal. It includes a GPS receiver that receives GPS signals and the DGPS correction data from the DGPS reference receiver. A tag transmitter transmits a wireless RF signal containing GPS location data based on received GPS signals and DGPS correction data. At least one access point is positioned within the terminal for receiving the wireless RF signal from the tag transmitter. A processor is operatively connected to the at least one access point for receiving GPS location data and determining a location of the asset to be tracked.

    摘要翻译： 用于跟踪终端内的资产的定位系统包括终端内的差分全球定位系统（DGPS）参考接收机，其接收GPS信号并产生DGPS校正数据。 在一个方面，粗纱接收机单元由在终端内跟踪的资产携带。 它包括GPS接收器，其接收来自DGPS参考接收机的GPS信号和DGPS校正数据。 标签发送器基于接收到的GPS信号和DGPS校正数据发送包含GPS位置数据的无线RF信号。 至少一个接入点位于终端内，用于从标签发射器接收无线RF信号。 处理器可操作地连接到所述至少一个接入点，用于接收GPS位置数据并确定要跟踪的资产的位置。

    Method and apparatus for indicating packet boundaries in frames
    12.
    发明授权
    Method and apparatus for indicating packet boundaries in frames 有权

    公开(公告)号：US07554977B2

    公开(公告)日：2009-06-30

    申请号：US10174042

    申请日：2002-06-18

    申请人： Vladimir Parizhsky ,  Tom Richardson ,  Junyi Li

    发明人： Vladimir Parizhsky ,  Tom Richardson ,  Junyi Li

    IPC分类号： H04L12/28 ,  H04L12/56

    CPC分类号： H04L29/06 ,  H04L69/324

    摘要： Frames including a packet boundary information field indicator and, optionally, packet boundary information field in addition to packet data are described. Methods and apparatus for generating and using such frames are also described. The packet boundary indicator indicates the presence or absence of at least one packet boundary information field in the frame. Frames with a payload that is fully occupied with data corresponding to a single packet do not include a packet boundary information field. The packet boundary information field indicates the location of a corresponding packet boundary and the type of boundary. One packet boundary information field is included in a frame for each boundary separating the data corresponding to different packets. By using packet boundary information fields to specify the location of packet boundaries, the need to parse an entire packet to identify the location of a packet boundary is avoided.

    SYSTEM AND METHOD FOR TRACKING VEHICLES AND CONTAINERS
    13.
    发明申请
    SYSTEM AND METHOD FOR TRACKING VEHICLES AND CONTAINERS 有权
    用于跟踪车辆和集装箱的系统和方法

    公开(公告)号：US20080191937A1

    公开(公告)日：2008-08-14

    申请号：US12028894

    申请日：2008-02-11

    申请人： David S. WISHERD ,  Robert W. Boyd ,  Tom Richardson ,  Santiago Romero ,  Michael A. Wohl

    发明人： David S. WISHERD ,  Robert W. Boyd ,  Tom Richardson ,  Santiago Romero ,  Michael A. Wohl

    IPC分类号： G01S5/14

    CPC分类号： G01S19/07 ,  G01S19/09

    摘要： A location system for tracking assets within a terminal includes a Differential Global Positioning System (DGPS) reference receiver within the terminal that receives GPS signals and generates DGPS correction data. In one aspect, a roving receiver unit is carried by an asset to be tracked within the terminal. It includes a GPS receiver that receives GPS signals and the DGPS correction data from the DGPS reference receiver. A tag transmitter transmits a wireless RF signal containing GPS location data based on received GPS signals and DGPS correction data. At least one access point is positioned within the terminal for receiving the wireless RF signal from the tag transmitter. A processor is operatively connected to the at least one access point for receiving GPS location data and determining a location of the asset to be tracked.

    摘要翻译： 用于跟踪终端内的资产的位置系统包括终端内的差分全球定位系统（DGPS）参考接收机，其接收GPS信号并产生DGPS校正数据。 在一个方面，粗纱接收机单元由在终端内跟踪的资产携带。 它包括GPS接收器，其接收来自DGPS参考接收机的GPS信号和DGPS校正数据。 标签发送器基于接收到的GPS信号和DGPS校正数据发送包含GPS位置数据的无线RF信号。 至少一个接入点位于终端内，用于从标签发射器接收无线RF信号。 处理器可操作地连接到所述至少一个接入点，用于接收GPS位置数据并确定要跟踪的资产的位置。

    In-band rate indicator methods and apparatus
    17.
    发明申请
    In-band rate indicator methods and apparatus 有权
    带内速率指示方法和装置

    公开(公告)号：US20070019583A1

    公开(公告)日：2007-01-25

    申请号：US11229019

    申请日：2005-09-16

    申请人： Rajiv Laroia ,  Hui Jin ,  Junyi Li ,  Frank Lane ,  Tom Richardson

    发明人： Rajiv Laroia ,  Hui Jin ,  Junyi Li ,  Frank Lane ,  Tom Richardson

    IPC分类号： H04Q7/00

    CPC分类号： H04L1/0025 ,  H04L1/0004 ,  H04L1/0005 ,  H04L1/0029 ,  H04L1/0039 ,  H04L1/0046 ,  H04L1/0057 ,  H04L1/0075 ,  H04L5/0053 ,  H04L27/0008 ,  H04L27/0012 ,  H04L27/2602 ,  H04L2001/0098

    摘要： Downlink traffic channel data rate options and methods of indicating to a wireless terminal a utilized downlink data rate option are described. The downlink traffic channel rate option for a segment is conveyed using an assignment signal and/or a block in the downlink traffic channel segment which is not used for user data. Downlink segment assignment signals in some implementations allocate fewer bits for rate option indication than are required to uniquely identify each option. In some implementations low rate options, e.g., using QPSK, are uniquely identified via assignment signals. Higher rate options, e.g., using QAM16 modulation, are conveyed via the distinct information block in the downlink traffic segment using a first coding/modulation method. Still higher rate options, e.g., using QAM16, QAM64, or QAM256, are conveyed via the information block in the segment using a second coding/modulation method which is applied to the rate option information.

    摘要翻译： 下行业务信道数据速率选项和向无线终端指示使用的下行链路数据速率选项的方法进行描述。 使用未用于用户数据的下行链路业务信道段中的分配信号和/或块来传送段的下行业务信道速率选项。 在一些实现中的下行链路段分配信号比用于唯一地标识每个选项所需的比特率分配更少的比特选项指示。 在一些实现中，通过分配信号唯一地识别低速率选项，例如使用QPSK。 使用第一编码/调制方法，通过下行链路业务段中的不同信息块传送更高速率选项，例如使用QAM16调制。 使用应用于速率选项信息的第二编码/调制方法，通过片段中的信息块传送诸如使用QAM16，QAM64或QAM256的更高速率选项。

    Memory efficient LDPC decoding methods and apparatus
    18.
    发明授权
    Memory efficient LDPC decoding methods and apparatus 有权
    存储器高效的LDPC解码方法和装置

    公开(公告)号：US07127659B2

    公开(公告)日：2006-10-24

    申请号：US10909753

    申请日：2004-08-02

    申请人： Tom Richardson ,  Vladimir Novichkov

    发明人： Tom Richardson ,  Vladimir Novichkov

    IPC分类号： H03M13/00

    CPC分类号： H03M13/6362 ,  H03M13/1105 ,  H03M13/1111 ,  H03M13/1114 ,  H03M13/1117 ,  H03M13/1122 ,  H03M13/1137

    摘要： Methods and apparatus for implementing memory efficient LDPC decodes are described. In accordance with the invention message information is stored in a compressed state for check node processing operations. The state for a check node is fully updated and then subject to an extraction process to generate check node to variable node messages. The signs of messages received from variable nodes may be stored by the check node processor module of the invention for use in message extraction. The check node processor can process messages in variable node order thereby allowing the variable node processor and check node processor to operate on messages in the same order reducing or eliminating the need to buffer and/or reorder messages passed between check nodes and variable nodes. Graph structures which allow check node processing on one graph iteration to proceed before the previous graph iteration has been completed are also described.

    摘要翻译： 描述了实现存储器高效LDPC解码的方法和装置。 根据本发明，消息信息以压缩状态存储以进行校验节点处理操作。 检查节点的状态被完全更新，然后进行提取处理，以生成可变节点消息的校验节点。 从可变节点接收的消息的符号可以由本发明的校验节点处理器模块存储以用于消息提取。 校验节点处理器可以以可变节点顺序处理消息，从而允许变量节点处理器和校验节点处理器以相同的顺序对消息进行操作，以减少或消除在校验节点和可变节点之间传递的消息的缓冲和/或重新排序的需要。 还描述了允许在先前的图形迭代完成之前在一个图形迭代上进行校验节点处理的图形结构。

    Methods and apparatus for reducing error floors in message passing decoders
    20.
    发明申请
    Methods and apparatus for reducing error floors in message passing decoders 有权
    消息传递解码器中减少错误层的方法和装置

    公开(公告)号：US20050138520A1

    公开(公告)日：2005-06-23

    申请号：US10892587

    申请日：2004-07-16

    申请人： Tom Richardson

    发明人： Tom Richardson

    IPC分类号： H03M13/03 ,  H03M13/11 ,  H03M13/29 ,  H04L1/00

    CPC分类号： H03M13/1128 ,  H03M13/1111 ,  H03M13/2963 ,  H03M13/3723 ,  H03M13/6331 ,  H04L1/0051 ,  H04L1/0057 ,  H04L25/03171

    摘要： An iterative message passing decoder, e.g., an LDPC decoder, operating in conjunction with a soft input-soft output signal processing unit, e.g., an ISI detector, has an error floor performance region influenced by the decoder's sub-optimal message passing nature. Error floor reduction is achieved by a simple message re-initialization mechanism. Decoder edge states, e.g., constraint to variable node messages in decoder memory, are reinitialized, e.g., for an iteration, during the decoding after soft values provided by signal processing unit have improved. During the message re-initialization and for some subsequent amount of iterative decoder processing, extrinsic information fed back from the decoder to the signal processing unit and/or soft values delivered to the decoder from the signal processing unit, in an outer communications loop, is temporarily frozen, e.g., using a switch and a buffer. Then, the outer communications loop is restored as the decoding continues, achieving improved decoding performance.

    摘要翻译： 与软输入软输出信号处理单元（例如ISI检测器）一起操作的迭代消息传递解码器（例如，LDPC解码器）具有受解码器的次优消息传递性质影响的错误楼层性能区域。 通过简单的消息重新初始化机制实现错误楼层减少。 解码器边缘状态，例如解码器存储器中对可变节点消息的约束，在由信号处理单元提供的软值改善之后，在解码期间被重新初始化，例如用于迭代。 在消息重新初始化期间和一些后续量的迭代解码器处理中，在外部通信环路中从解码器反馈到信号处理单元的外部信息和/或从信号处理单元递送到解码器的软值值是 暂时冻结，例如使用开关和缓冲器。 然后，随着解码的继续，恢复外部通信环路，实现改进的解码性能。