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29 条记录 (耗时 0.033 秒)

    Asymmetric RTT ranging with multipath correction
    15.
    发明授权
    Asymmetric RTT ranging with multipath correction 有权
    不对称RTT范围与多径校正

    公开(公告)号：US08779901B2

    公开(公告)日：2014-07-15

    申请号：US13084865

    申请日：2011-04-12

    申请人： Paul E. Gorday ,  Edgar H. Callaway, Jr. ,  Frederick L. Martin

    发明人： Paul E. Gorday ,  Edgar H. Callaway, Jr. ,  Frederick L. Martin

    IPC分类号： H04Q5/22 ,  H04B17/00

    CPC分类号： H04B17/0047 ,  H04B17/364

    摘要： A method, system, and device provide asymmetric round-trip-time (RTT) ranging with multipath correction. A RTT ranging determination using the resulting composite received signal contains multipath error, and compensation or correction of this error in a manner compatible with low-power, low-complexity devices, such as tag devices, is provided.

    摘要翻译： 一种方法，系统和设备提供了具有多径校正的不对称往返时间（RTT）范围。 使用所得到的复合接收信号的RTT测距确定包含多径误差，并且以与低功率，低复杂度设备（例如标签设备）兼容的方式来补偿或校正该误差。

    Communications system employing differential orthogonal modulation
    18.
    发明授权
    Communications system employing differential orthogonal modulation 有权
    采用差分正交调制的通信系统

    公开(公告)号：US06519275B2

    公开(公告)日：2003-02-11

    申请号：US10022942

    申请日：2001-12-18

    申请人： Edgar H. Callaway, Jr. ,  Neiyer S. Correal ,  Paul E. Gorday ,  Frederick L. Martin ,  Qicai Shi

    发明人： Edgar H. Callaway, Jr. ,  Neiyer S. Correal ,  Paul E. Gorday ,  Frederick L. Martin ,  Qicai Shi

    IPC分类号： H04B1707

    CPC分类号： H04B1/7075

    摘要： A system and method for orthogonal modulation of signals in communication systems. In the transmitter, differentially coded symbols are used to select time-shifted code sequences. The timing, or code position, of a code sequence is determined at the receiver by comparison to the previous code from the same channel, thus eliminating the need for dual-channel transmission and eliminating error due to differences in path propagation time. A fixed preamble code is also used to synchronize the receiver.

    摘要翻译： 一种用于通信系统中信号正交调制的系统和方法。 在发射机中，使用差分编码符号来选择时移码序列。 通过与来自相同信道的先前代码进行比较，在接收器处确定码序列的定时或码位置，从而消除了对双信道传输的需要，并消除由于路径传播时间差异引起的误差。 固定的前导码也用于同步接收机。

    Communication device
    19.
    发明授权
    Communication device 有权
    通讯设备

    公开(公告)号：US07295638B2

    公开(公告)日：2007-11-13

    申请号：US10715222

    申请日：2003-11-17

    申请人： Frederick L. Martin ,  Edgar H. Callaway ,  Paul E. Gorday ,  David B. Taubenheim

    发明人： Frederick L. Martin ,  Edgar H. Callaway ,  Paul E. Gorday ,  David B. Taubenheim

    IPC分类号： H03D1/06 ,  H03D11/04 ,  H03K5/01 ,  H04B1/10 ,  H04L1/00

    CPC分类号： H04L27/22 ,  H04B1/707 ,  H04B1/709 ,  H04B2201/70707

    摘要： A direct sequence spread spectrum (DSSS) receiver (100) consistent with certain embodiments has a frequency generator (112) that generates a local oscillator signal without use of a piezoelectric crystal. A frequency converter (108) receives the local oscillator signal and mixes the local oscillator signal with a received DSSS signal to produce a down-converted signal. The received DSSS signal is encoded using a first set of DSSS code. A differential chip detector (116) receives the down-converted signal and converts the down-converted signal to a differentially detected signal. A correlator (120) receives the differentially detected signal and correlates the detected signal with a set of DSSS codes that are time-shifted from the first set of DSSS codes. This abstract is not to be considered limiting, since other embodiments may deviate from the features described in this abstract.

    摘要翻译： 与某些实施例一致的直接序列扩频（DSSS）接收机（100）具有在不使用压电晶体的情况下产生本地振荡器信号的频率发生器（112）。 变频器（108）接收本地振荡器信号，并将本地振荡器信号与接收到的DSSS信号进行混频，产生下变频信号。 接收的DSSS信号使用第一组DSSS码进行编码。 差分芯片检测器（116）接收下变频信号并将下变频信号转换成差分检测信​​号。 相关器（120）接收差分检测信​​号，并将检测到的信号与从第一组DSSS码进行时移的一组DSSS码进行相关。 该摘要不被认为是限制性的，因为其他实施例可能偏离本摘要中描述的特征。

    Sync bursts for frequency offset compensation
    20.
    发明授权
    Sync bursts for frequency offset compensation 有权
    用于频偏补偿的同步脉冲串

    公开(公告)号：US07277457B2

    公开(公告)日：2007-10-02

    申请号：US10678416

    申请日：2003-10-03

    申请人： Paul E. Gorday ,  Edgar Herbert Callaway, Jr. ,  Frederick L. Martin ,  David B. Taubenheim

    发明人： Paul E. Gorday ,  Edgar Herbert Callaway, Jr. ,  Frederick L. Martin ,  David B. Taubenheim

    IPC分类号： H04J3/06

    CPC分类号： H04L27/0014 ,  H04L7/04 ,  H04L2027/0026 ,  H04L2027/0083 ,  H04W56/0035 ,  Y02D70/00 ,  Y02D70/142 ,  Y02D70/144 ,  Y02D70/162 ,  Y02D70/22

    摘要： A method (500) and system for compensation of frequency offset between a first transceiver (102) and a second transceiver (104) in wireless communication are disclosed. The compensation of the frequency offset between two or more transceivers (102, 104) is achieved using frequency synchronization bursts. These bursts contain information about the frequency offset. The frequency synchronization bursts are transmitted by the first transceiver at a range of frequencies above and below its carrier frequency (502). A second transceiver that receives at least one of these bursts (504) determines the frequency offset (504), and adjusts its frequency to match the frequency of the first transceiver (508). Thereafter, the second transceiver may enter a low power sleep mode (510) in order to reduce its power consumption. The second transceiver returns to active mode (512) just before the start of the transmission of the data packets (514).

    摘要翻译： 公开了一种用于在无线通信中补偿第一收发器（102）和第二收发器（104）之间的频率偏移的方法（500）和系统。 使用频率同步脉冲串实现两个或多个收发器（102,104）之间的频率偏移的补偿。 这些突发包含有关频率偏移的信息。 频率同步突发由第一收发器在其载波频率（502）之上和之下的频率范围内传输。 接收这些突发（504）中的至少一个的第二收发器确定频率偏移（504），并且调整其频率以匹配第一收发器（508）的频率。 此后，第二收发器可以进入低功率休眠模式（510），以便降低其功耗。 第二收发器在数据分组（514）的发送开始之前返回到活动模式（512）。