System and method for distributing data in dedicated short-range communication system
    1.
    发明申请
    System and method for distributing data in dedicated short-range communication system 审中-公开
    在专用短距离通信系统中分配数据的系统和方法

    公开(公告)号:US20070217372A1

    公开(公告)日:2007-09-20

    申请号:US11375234

    申请日:2006-03-14

    IPC分类号: H04Q7/24

    CPC分类号: H04L45/00 H04L67/12 H04W40/20

    摘要: A data distribution system includes a controller communicatively coupled to an origin. A plurality of mobile units capable of storing, receiving, and communicating data pass within communication range of the origin. The controller has data configured for a destination, but the destination is communicatively unlinked from the controller. To communicate the data to the destination, the controller selects a mobile unit passing in range of the origin and communicates the data. The mobile unit has a route at least approximately allied with a geographical location of the destination. The mobile unit stores the data and continues traveling. The mobile unit communicates the data to the destination if in the communication range of the destination unit. Alternatively, the mobile unit communicates the data to another mobile unit if the other mobile unit has a route at least approximately more allied with the geographical location of the destination.

    摘要翻译: 数据分配系统包括通信地耦合到原点的控制器。 能够存储,接收和传送数据的多个移动单元在原点的通信范围内通过。 控制器具有为目的地配置的数据,但目的地与控制器通信地取消链接。 为了将数据传送到目的地,控制器选择通过原点范围的移动单元并传送数据。 移动单元具有至少近似地与目的地的地理位置相关联的路线。 移动单元存储数据并继续行进。 如果在目的地单元的通信范围内,移动单元将数据传送到目的地。 或者,如果其他移动单元具有与目的地的地理位置至少近似更多的路由,则移动单元将数据传送到另一个移动单元。

    Communication device
    3.
    发明申请
    Communication device 有权
    通讯设备

    公开(公告)号:US20050105595A1

    公开(公告)日:2005-05-19

    申请号:US10715222

    申请日:2003-11-17

    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。

    Multi-mode receiver for frequency error mitigation
    4.
    发明申请
    Multi-mode receiver for frequency error mitigation 有权
    用于频率误差减轻的多模式接收器

    公开(公告)号:US20050079843A1

    公开(公告)日:2005-04-14

    申请号:US10683098

    申请日:2003-10-10

    CPC分类号: H04B1/406 H04L2027/0065

    摘要: The present invention provides a multimode receiver design for mitigation of frequency offset by selective demodulation of an input modulated signal. The receiver (103) comprises a plurality of demodulators (207). Each of the plurality of demodulators (207) has the same functionality but different receiver sensitivity versus frequency-offset mitigation characteristics. Each of these demodulators incorporates a different demodulation technique. A suitable demodulator is selected to demodulate the received signal. The choice of a suitable demodulator is based on the value of the frequency offset (305, 307).

    摘要翻译: 本发明提供一种多模接收机设计,用于通过对输入调制信号的选择性解调来减轻频偏。 接收器(103)包括多个解调器(207)。 多个解调器(207)中的每一个具有相同的功能,但是具有不同的接收机灵敏度与频偏抑制特性。 这些解调器中的每一个都包含不同的解调技术。 选择合适的解调器来解调所接收的信号。 合适的解调器的选择基于频率偏移的值(305,307)。

    Sync bursts frequency offset compensation
    5.
    发明申请
    Sync bursts frequency offset compensation 有权
    同步突发频偏补偿

    公开(公告)号:US20060072586A1

    公开(公告)日:2006-04-06

    申请号:US10959359

    申请日:2004-10-06

    IPC分类号: H04L12/28

    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 by transmitting a set of 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). When system conditions permit, a subset of the set of frequency synchronization bursts may be transmitted instead of transmitting the full set of frequency synchronization bursts.

    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。 通过发送一组频率同步脉冲串来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。 当系统条件允许时,可以发送该组频率同步脉冲串的子集,而不是传送全套频率同步脉冲串。

    Sync bursts for frequency offset compensation
    6.
    发明申请
    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:US20050074036A1

    公开(公告)日:2005-04-07

    申请号:US10678416

    申请日:2003-10-03

    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)。

    Method and system for determining a location using a plurality of selected initial location estimates
    8.
    发明申请
    Method and system for determining a location using a plurality of selected initial location estimates 有权
    使用多个选择的初始位置估计来确定位置的方法和系统

    公开(公告)号:US20050143100A1

    公开(公告)日:2005-06-30

    申请号:US10747377

    申请日:2003-12-29

    CPC分类号: H04W64/00 G01S5/02 G01S5/0289

    摘要: A method and system is provided for determining a location for each of a plurality of units, which is selected from one of multiple sets of locations, which are each estimated based upon different initial location estimates. The selected set of locations includes the set which has the minimum error value, where the error value is based on the aggregate of the differences between the range determined from the estimated locations and the measured range. By using different sets of initial location estimates, there is a greater chance that at least one of the sets of initial location estimates will avoid any local minimums and produce a more accurate estimate of unit locations.

    摘要翻译: 提供了一种方法和系统,用于确定多个单元中的每一个的位置,所述单元从多个位置集合中的一个组中选择,每个单元基于不同的初始位置估计来估计。 所选择的一组位置包括具有最小误差值的集合,其中误差值基于从估计位置确定的范围与测量范围之间的差异的总和。 通过使用不同的初始位置估计集合,初始位置估计集合中的至少一个将避免任何局部最小值并且对单位位置产生更准确的估计的可能性更大。