利索-全球专利检索

  1. 登录
  2. 注册

搜索结果

7 条记录 (耗时 0.011 秒)

    Method and apparatus for fine frequency synchronization in wireless broadband (WiBro) system without using global positioning system (GPS) receiver
    3.
    发明授权
    Method and apparatus for fine frequency synchronization in wireless broadband (WiBro) system without using global positioning system (GPS) receiver 有权
    无线宽带（WiBro）系统中精细频率同步的方法和装置，不使用全球定位系统（GPS）接收机

    公开(公告)号：US08031818B2

    公开(公告)日：2011-10-04

    申请号：US12026108

    申请日：2008-02-05

    申请人： Sung-won Lee ,  Young-gon Choi ,  Jung-ho Kim ,  Yong-sung Roh ,  Hae-lyong Kim ,  Nam-shik Kim ,  Hyun-cheol Park ,  Joong-soo Ma

    发明人： Sung-won Lee ,  Young-gon Choi ,  Jung-ho Kim ,  Yong-sung Roh ,  Hae-lyong Kim ,  Nam-shik Kim ,  Hyun-cheol Park ,  Joong-soo Ma

    IPC分类号： H04L27/06

    CPC分类号： H04L27/2675 ,  H04L27/266 ,  H04L27/2672 ,  H04L2027/0046

    摘要： Provided is a fine frequency synchronization method of a WiBro system, and particularly, a fine frequency synchronization method which measures a spread degree of a received signal of an adjacent subcarrier using orthogonality of PN sequences and thereby estimates a frequency offset, in a base station or a wireless repeater without using a GPS receiver. The fine frequency synchronization method includes: (a) performing despreading on received adjacent subcarrier sequences, using a PN sequence transmitted from a transmitting party; (b) obtaining ratios of correlative values obtained by the despreading; and (c) estimating a frequency offset on the basis of the ratio of correlative values. Accordingly, fine frequency offset estimation with relatively low complexity is possible without using a GPS receiver in a WiBro environment where interference signals of other base stations or repeaters exist.

    摘要翻译： 提供了一种WiBro系统的精细频率同步方法，特别是精细频率同步方法，其使用PN序列的正交性来测量相邻副载波的接收信号的扩展程度，从而估计基站中的频率偏移， 无需使用GPS接收机的无线中继器。 精细频率同步方法包括：（a）使用从发送方发送的PN序列对接收到的相邻子载波序列执行解扩; （b）获得通过解扩获得的相关值的比率; 和（c）基于相关值的比率估计频率偏移。 因此，在WiBro环境中不使用其他基站或中继器的干扰信号的GPS接收机的情况下，可以实现相对低的复杂度的精细频偏估计。

    METHOD AND APPARATUS FOR FINE FREQUENCY SYNCHRONIZATION IN WIRELESS BROADBAND (WIBRO) SYSTEM WITHOUT USING GLOBAL POSITIONING SYSTEM (GPS) RECEIVER
    4.
    发明申请
    METHOD AND APPARATUS FOR FINE FREQUENCY SYNCHRONIZATION IN WIRELESS BROADBAND (WIBRO) SYSTEM WITHOUT USING GLOBAL POSITIONING SYSTEM (GPS) RECEIVER 有权
    无线宽带（WIBRO）系统中无需使用全球定位系统（GPS）接收机的频率同步的方法和装置

    公开(公告)号：US20090041095A1

    公开(公告)日：2009-02-12

    申请号：US12026108

    申请日：2008-02-05

    申请人： Sung-won LEE ,  Young-gon CHOI ,  Jung-ho KIM ,  Yong-sung ROH ,  Hae-lyong KIM ,  Nam-shik KIM ,  Hyun-cheol PARK ,  Joong-soo MA

    发明人： Sung-won LEE ,  Young-gon CHOI ,  Jung-ho KIM ,  Yong-sung ROH ,  Hae-lyong KIM ,  Nam-shik KIM ,  Hyun-cheol PARK ,  Joong-soo MA

    IPC分类号： H04B1/707

    CPC分类号： H04L27/2675 ,  H04L27/266 ,  H04L27/2672 ,  H04L2027/0046

    摘要： Provided is a fine frequency synchronization method of a WiBro system, and particularly, a fine frequency synchronization method which measures a spread degree of a received signal of an adjacent subcarrier using orthogonality of PN sequences and thereby estimates a frequency offset, in a base station or a wireless repeater without using a GPS receiver. The fine frequency synchronization method includes: (a) performing despreading on received adjacent subcarrier sequences, using a PN sequence transmitted from a transmitting party; (b) obtaining ratios of correlative values obtained by the despreading; and (c) estimating a frequency offset on the basis of the ratio of correlative values. Accordingly, fine frequency offset estimation with relatively low complexity is possible without using a GPS receiver in a WiBro environment where interference signals of other base stations or repeaters exist.

    摘要翻译： 提供了一种WiBro系统的精细频率同步方法，特别是精细频率同步方法，其使用PN序列的正交性来测量相邻副载波的接收信号的扩展程度，从而估计基站中的频率偏移， 无需使用GPS接收机的无线中继器。 精细频率同步方法包括：（a）使用从发送方发送的PN序列对接收到的相邻子载波序列执行解扩; （b）获得通过解扩获得的相关值的比率; 和（c）基于相关值的比率估计频率偏移。 因此，在WiBro环境中不使用其他基站或中继器的干扰信号的GPS接收机的情况下，可以实现相对低的复杂度的精细频偏估计。

    Mass flow controller for control purge and managing method of the same
    7.
    发明授权
    Mass flow controller for control purge and managing method of the same 失效
    质量流量控制器用于控制吹扫和管理方法

    公开(公告)号：US06843122B2

    公开(公告)日：2005-01-18

    申请号：US10431129

    申请日：2003-05-07

    申请人： Hae-Lyong Kim ,  Tae-Ho Lee

    发明人： Hae-Lyong Kim ,  Tae-Ho Lee

    IPC分类号： G01F1/68 ,  G01F1/684 ,  G01F5/00 ,  G05D7/01 ,  H01L21/02 ,  G06F19/00

    CPC分类号： G01F5/00 ,  G01F1/6847 ,  G05D7/0635

    摘要： The present invention relates to a mass flow controller for a control purge and a managing method of the same. When a user sets the mode to a control purge mode capable of controlling a maximum flowing amount for constantly maintaining a maximum flowing amount when performing a purge function after the user sets a purge function mode based on a purpose of use of a mass flow controller, a control circuit compares a set value of a flowing amount inputted based on a user's selection with a previously set threshold value and controls a valve for constantly maintaining a maximum flowing amount by switching to a gain resistor for a purge mode having a gain value capable of performing a purge function and controls a valve for thereby accurately controlling a small flowing amount by switching to a gain resistor for a common control mode having a gain value capable of performing a common control function. When a user sets the mode to a purge function mode based on a state of use of a mass flow controller, fully opens a valve and sets a valve open purge mode for obtaining a maximum flowing amount, a control circuit compares a set value of a flowing amount inputted by a user with a previously set threshold value and controls a valve for fully opening a valve for thereby implementing a maximum flowing amount and accurately controlling a small flowing amount.

    摘要翻译： 本发明涉及一种用于控制吹扫的质量流量控制器及其管理方法。 当用户基于使用质量流量控制器的目的设置吹扫功能模式时，当用户将模式设置为能够控制最大流量的持续保持最大流量时的控制吹扫模式， 控制电路将基于用户选择输入的流量的设定值与预先设定的阈值进行比较，并且通过切换到增益电阻器来控制持续保持最大流量的阀，所述增益电阻器具有能够 执行净化功能并控制阀，从而通过切换到具有能够执行公共控制功能的增益值的公共控制模式的增益电阻来精确地控制小流量。 当用户基于质量流量控制器的使用状态将模式设置为吹扫功能模式时，完全打开阀并设置阀打开吹扫模式以获得最大流量，控制电路将a的设定值 流量由用户输入预先设定的阈值，并且控制用于完全打开阀的阀，从而实现最大流量并精确地控制小流量。