Sync bursts for frequency offset compensation
    1.
    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)。

    Communication device
    2.
    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
    3.
    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
    4.
    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。

    Location-based network access
    5.
    发明申请
    Location-based network access 审中-公开
    基于位置的网络访问

    公开(公告)号:US20060143292A1

    公开(公告)日:2006-06-29

    申请号:US11024381

    申请日:2004-12-28

    IPC分类号: G06F15/173

    摘要: When a candidate node (104) wishes to join a network (100), network access is either allowed or denied based on the candidate node's physical location. More particularly, a plurality of nodes associated with the network aide in locating the candidate node. Once located, a decision is made to either allow or deny network access based on the candidate node's physical location.

    摘要翻译: 当候选节点(104)希望加入网络(100)时,基于候选节点的物理位置来允许或拒绝网络接入。 更具体地,在定位候选节点时与网络相关联的多个节点。 一旦找到,就作出决定,以允许或拒绝基于候选节点的物理位置的网络访问。

    Method and apparatus for transmitting data within a communication system
    6.
    发明申请
    Method and apparatus for transmitting data within a communication system 审中-公开
    用于在通信系统内传输数据的方法和装置

    公开(公告)号:US20060176896A1

    公开(公告)日:2006-08-10

    申请号:US11055459

    申请日:2005-02-10

    IPC分类号: H04J3/16 H04J3/22 H04L12/413

    CPC分类号: H04L12/413 H04L1/1867

    摘要: A node (101) using a contention-based access scheme will monitor a channel for a predetermined condition. If the predetermined condition is detected, the node will defect from the contention-based access scheme, where any generated messages will be immediately transmitted. Should a second condition be met, the node will again follow the contention-based access scheme.

    摘要翻译: 使用基于竞争的接入方案的节点(101)将监视预定条件的信道。 如果检测到预定条件,则节点将从基于竞争的接入方案中缺陷,其中任何生成的消息将被立即发送。 如果满足第二个条件,节点将再次遵循基于竞争的访问方案。

    Method and apparatus for battery life extension for nodes within beaconing networks
    8.
    发明申请
    Method and apparatus for battery life extension for nodes within beaconing networks 有权
    信标网络节点电池寿命延长的方法和装置

    公开(公告)号:US20050099985A1

    公开(公告)日:2005-05-12

    申请号:US11017274

    申请日:2004-12-20

    IPC分类号: G08C17/00 H04Q7/24

    CPC分类号: G08C17/00

    摘要: An “identical beacons” field (401) is inserted near the beginning of a transmitted beacon (403) that contains either an integer equal to the number of consecutive identical beacons sent (i.e., identical to the one presently being transmitted) or a repetition bit indicating whether or not the beacon contains changed information when compared to a prior-sent beacon. After sleeping awhile, a node (302-304) wakes up, receives a first portion of the beacon containing the identical beacons field, and analyzes the identical beacons field. Based on the analysis, the node makes a decision on whether to remain “awake” for reception of the remaining beacon or to return to sleep.

    摘要翻译: 在发送的信标(403)的开始附近插入“相同的信标”字段(401),其包含等于所发送的连续相同信标的数量的整数(即,与当前正在发送的信标相同)或重复位 指示当与先前发送的信标相比时,信标是否包含改变的信息。 睡觉一段时间后,节点(302 - 304)唤醒,接收包含相同信标字段的信标的第一部分,并分析相同的信标字段。 基于分析,节点作出关于是否保持“唤醒”接收剩余信标或返回睡眠的决定。