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    Modulation frequency tunable optical oscillator
    41.
    发明申请
    Modulation frequency tunable optical oscillator 有权

    公开(公告)号：US20050084208A1

    公开(公告)日：2005-04-21

    申请号：US10749145

    申请日：2003-12-31

    Applicant: Ho Kim ,  Eun Nam ,  Kyoung Cho

    Inventor： Ho Kim ,  Eun Nam ,  Kyoung Cho

    IPC: G02B26/00 ,  G02B6/34 ,  H01S3/067 ,  H01S3/0941 ,  H01S3/106 ,  H01S3/16 ,  G02B6/26

    CPC classification number: G02B6/29319 ,  G02B6/02076 ,  G02B6/278 ,  G02B6/29322 ,  H01S3/0675 ,  H01S3/0941 ,  H01S3/106 ,  H01S3/1608

    Abstract: The present invention relates to a millimeter wave frequency band optical oscillator used for an oscillating frequency signal source of millimeter waves transmitted from a repeater to a wireless subscriber in a millimeter wave wireless subscriber communication system for a next-generation (i.e., 5th generation or less) very high speed wireless internet service, wherein a loop mirror and a pair of optical fiber grating mirrors are used. A wavelength fixed type and a wavelength tunable type optical fiber grating mirrors are connected in a serial manner to constitute a dual laser mode resonator capable of simultaneously oscillating two laser modes, which are appropriate to each wavelength. Therefore, it is possible to obtain a laser light source capable of an extremely high frequency (60 GHz or more) modulation by using beat phenomena between two laser modes.

    Vehicle bonnet hinge
    43.
    发明授权
    Vehicle bonnet hinge 失效
    车帽铰链

    公开(公告)号：US06834735B2

    公开(公告)日：2004-12-28

    申请号：US10160962

    申请日：2002-05-31

    Applicant: Ho Kim

    Inventor： Ho Kim

    IPC: B62D2510

    CPC classification number: E05D3/145 ,  B60R21/38 ,  E05D3/022 ,  E05Y2900/536

    Abstract: A vehicle hood hinge is provided, which includes a hinge arm coupled with a hood, and having first and second hinge holes. First and second links are coupled at their upper ends, respectively, to the first and second hinge holes by axial pins. A hinge support having a hinge hole is rotatably coupled with a lower end part of the second link by an axial pin and coupled via coupling holes and bolts with a vehicle body. A slot is longitudinally formed in the hinge support. A plate spring is fixedly mounted at an end of the slot, and formed with a holding shoulder for preventing the hinge pin from deviating from a normal hinge operation position under normal circumstances, but allowing the hinge pin to deviate from the normal hinge operation position by moving along the slot when an external impact is applied.

    Abstract translation: 提供了一种车辆罩铰链，其包括与发动机罩连接并具有第一和第二铰链孔的铰链臂。 第一和第二连杆在其上端分别通过轴向销连接到第一和第二铰链孔。 具有铰链孔的铰链支撑件通过轴向销与第二连杆的下端部分可旋转地联接，并通过联接孔和螺栓与车体联接。 在铰链支架中纵向地形成槽。 平板弹簧固定地安装在槽的端部，并且形成有用于防止铰链销在正常情况下偏离正常铰链操作位置的保持肩部，但是允许铰链销偏离正常铰链操作位置 当施加外部冲击时沿着槽移动。

    Device and method for symbol frame synchronization of OFDM transmitter and receiver
    49.
    发明授权
    Device and method for symbol frame synchronization of OFDM transmitter and receiver 有权
    OFDM发射机和接收机的符号帧同步的装置和方法

    公开(公告)号：US07319660B2

    公开(公告)日：2008-01-15

    申请号：US10412262

    申请日：2003-04-14

    Applicant: Ki-yun Kim ,  Ho Kim ,  Jun-yun Lee ,  Hyung-jin Choi

    Inventor： Ki-yun Kim ,  Ho Kim ,  Jun-yun Lee ,  Hyung-jin Choi

    IPC: H04J11/00

    CPC classification number: H04L27/2613 ,  H04L27/2656

    Abstract: Provided is a frame synchronization pattern design and synchronization method by which in a transmitter of a communications system employing an orthogonal frequency division multiplexing (OFDM), a frame synchronization pattern is inserted into the starting part of a symbol frame, and by detecting the frame synchronization pattern in a receiver, synchronization of the OFDM transmitter and receiver is performed. Also, provided are a transmitter synchronization apparatus including an OFDM symbol frame generation unit, a frame synchronization pattern insertion unit, and an OFDM transmission signal conversion unit, and a receiver synchronization apparatus comprising a frame synchronization pattern inserted OFDM symbol frame conversion unit, a frame synchronization pattern detection unit, and a source data generation unit.Overcoming the conventional notion depending on the earlier art OFDM symbol standards, the OFDM symbol frame start detection method according to the present invention places a free-length code pattern, which is separately generated in a time domain, in the starting point of a frame and detects this pattern such that accuracy and efficiency greatly improve. Also, since the power value of a received signal is detected in the method, the communications system operates regardless of the frequency offset and phase offset. In addition, since a free-length pattern can be designed, the start point of a frame can be accurately detected in a seriously fading channel, by detecting a maximum peak based on correlation.

    Abstract translation: 提供了一种帧同步模式设计和同步方法，在采用正交频分复用（OFDM）的通信系统的发射机中，将帧同步模式插入符号帧的起始部分，并通过检测帧同步 接收机中的模式，执行OFDM发射机和接收机的同步。 此外，提供了包括OFDM符号帧生成单元，帧同步码型插入单元和OFDM传输信号转换单元的发射机同步装置，以及包括帧同步码型插入OFDM符号帧转换单元的接收机同步装置， 同步模式检测单元和源数据生成单元。 根据本发明的OFDM符号帧起始检测方法克服了以前的OFDM符号标准的常规概念，将在时域中单独生成的自由长度码模式放在帧的起点处， 检测这种模式，使得精度和效率大大提高。 此外，由于在该方法中检测到接收信号的功率值，所以通信系统不管频率偏移和相位偏移如何运行。 此外，由于可以设计自由长度图案，因此通过基于相关性检测最大峰值，可以在严重衰落的信道中准确地检测帧的起始点。

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