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    CELL SEARCH SYSTEM FOR MOBILE STATION IN TIME DIVISION DUPLEX SYSTEM AND METHOD FOR THE SAME
    1.
    发明专利
    CELL SEARCH SYSTEM FOR MOBILE STATION IN TIME DIVISION DUPLEX SYSTEM AND METHOD FOR THE SAME 审中-公开

    公开(公告)号：JP2003189374A

    公开(公告)日：2003-07-04

    申请号：JP2002311619

    申请日：2002-10-25

    Applicant: KOREA ELECTRONICS TELECOMM

    Inventor： LEE YU-RO ,  KWON DONG-SEUNG

    IPC: H04B7/26 ,  H04B1/707 ,  H04B1/7083 ,  H04J3/00 ,  H04W36/36 ,  H04W48/16 ,  H04W76/02 ,  H04Q7/38 ,  H04Q7/22

    Abstract: PROBLEM TO BE SOLVED: To provide a cell search system for a mobile station that can reduce a base station searching time by discriminating the presence of synchronization through a confirmation mode after searching a secondary synchronization code without setting a critical value by the system at searching of a base station by the mobile station. SOLUTION: The cell search system for a mobile station in a time division duplex system includes; a primary synchronization code search module for searching primary synchronization codes while searching frames to determine a position of the maximum value; a correlation module for estimating a phase value required to demodulate a sub synchronization code and acquiring a received signal and a first correlation value for a code configuring a secondary synchronization code; a secondary synchronization code search module for generating determinative variables and storing them based on the position of the maximum value; a comparison and decision module for detecting a maximum value of the determinative variables, comparing it with the values stored in the secondary synchronization code search module to count matching values, and comparing the count value with a system value to decide whether slot synchronization and group acquisition is successful; and a base station determination module for determining a second correlation value between midamble codes and the received signals, and selecting a maximum value of it to determine a base station. COPYRIGHT: (C)2003,JPO

    METHOD FOR CONSTRUCTING FRAME PREAMBLE IN OFDM WIRELESS COMMUNICATION SYSTEM, AND METHOD FOR ACQUIRING FRAME SYNCHRONIZATION AND SEARCHING CELLS USING PREAMBLE
    4.
    发明申请
    METHOD FOR CONSTRUCTING FRAME PREAMBLE IN OFDM WIRELESS COMMUNICATION SYSTEM, AND METHOD FOR ACQUIRING FRAME SYNCHRONIZATION AND SEARCHING CELLS USING PREAMBLE 审中-公开
    用于在OFDM无线通信系统中构造帧前缀的方法，以及使用前缀获取帧同步和搜索小区的方法

    公开(公告)号：WO2005062728A3

    公开(公告)日：2006-08-31

    申请号：PCT/KR2004002730

    申请日：2004-10-27

    Applicant: KOREA ELECTRONICS TELECOMM ,  SAMSUNG ELECTRONICS CO LTD ,  KT CORP ,  SK TELECOM CO LTD ,  KT FREETEL CO LTD ,  HANARO TELECOM INC ,  LIM HYOUNG-SOO ,  YEH CHOONG-IL ,  LEE YU-RO ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU

    Inventor： LIM HYOUNG-SOO ,  YEH CHOONG-IL ,  LEE YU-RO ,  KWON DONG-SEUNG ,  HWANG SEUNG-KU

    IPC: H04J11/00

    CPC classification number: H04J11/00 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2675

    Abstract: Disclosed are a method for constructing a frame preamble in an OFDM wireless communication system, and a method for acquiring frame synchronization and searching cells using the preamble. The preamble is arranged at the beginning of a frame and constructed of a pattern repeated an integer number of times, and a CP. The pattern has a length shorter than a single OFDM symbol interval. The length of the repetitive pattern is not limited to an integer number of times a single OFDM symbol interval. Frame synchronization can be acquired by observing cross-correlation of a received signal and reference patterns and detecting the moment when the absolute value of the cross-correlation exceeds a predetermined threshold. Otherwise, frame synchronization can be acquired by observing auto-correlation of the received signal using repeated patterns included in the received signal and detecting the moment when the absolute value of the auto-correlation becomes the maximum value.

    Abstract translation: 公开了一种在OFDM无线通信系统中构造帧前同步码的方法，以及用于使用前置码获取帧同步和搜索小区的方法。 前导码被布置在帧的开始处，并且由重复整数次的模式和CP构成。 该模式的长度短于单个OFDM符号间隔。 重复模式的长度不限于单个OFDM符号间隔的整数倍。 可以通过观察接收信号和参考模式的互相关并且检测互相关的绝对值超过预定阈值的时刻来获取帧同步。 否则，可以通过使用包括在接收信号中的重复模式来观察接收信号的自相关并且检测自相关的绝对值成为最大值的时刻来获取帧同步。

    METHOD FOR ALLOCATING FREQUENCY DOMAIN SPREAD CODE IN BASE STATION OF MC-CDMA COMMUNICATION SYSTEM
    5.
    发明申请
    METHOD FOR ALLOCATING FREQUENCY DOMAIN SPREAD CODE IN BASE STATION OF MC-CDMA COMMUNICATION SYSTEM 审中-公开
    MC-CDMA通信系统基站分配频域扩频码的方法

    公开(公告)号：WO2007066871A3

    公开(公告)日：2010-11-11

    申请号：PCT/KR2006002924

    申请日：2006-07-25

    Applicant: KOREA ELECTRONICS TELECOMM ,  LIM HYUNG-SOO ,  LEE YU-RO ,  KWON DONG-SEUNG

    Inventor： LIM HYUNG-SOO ,  LEE YU-RO ,  KWON DONG-SEUNG

    IPC: H04L27/26 ,  H04J13/00 ,  H04J13/18 ,  H04L5/02

    CPC classification number: H04L5/0021 ,  H04J13/0048 ,  H04J13/18 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0064 ,  H04L5/0073

    Abstract: The present invention relates to a method for allocating a frequency domain spread code in a base station of a multi-carrier code division multiple access (MC-CDMA) communication system. A code allocation priority is established based on interference between previously allocated spread codes and a newly allocated spread code so as to minimize the interference caused by channel fading or a synchronization error according to a transmitting or receiving timing offset when a scheduler of the base station in the MC-CDMA communication system allocates a subcarrier group to the plurality of user terminals or channels, and the spread code is allocated to the plurality of user terminals or channels according to the established priority, by the scheduler of the base station.

    Abstract translation: 本发明涉及一种在多载波码分多址（MC-CDMA）通信系统的基站中分配频域扩频码的方法。 基于先前分配的扩展码和新分配的扩展码之间的干扰建立码分配优先级，以便当基站的调度器处于发送或接收定时偏移时，根据发送或接收定时偏移最小化由信道衰落或同步误差引起的干扰 MC-CDMA通信系统向多个用户终端或信道分配子载波组，并且由基站的调度器根据建立的优先级将扩频码分配给多个用户终端或信道。

    CINR ESTIMATING METHOD AND DEVICE USING PREAMBLE IN OFDM
    7.
    发明申请
    CINR ESTIMATING METHOD AND DEVICE USING PREAMBLE IN OFDM 审中-公开
    在OFDM中使用前缀的CINR估计方法和装置

    公开(公告)号：WO2007021159A2

    公开(公告)日：2007-02-22

    申请号：PCT/KR2006003258

    申请日：2006-08-18

    Applicant: SAMSUNG ELECTRONICS CO LTD ,  KOREA ELECTRONICS TELECOMM ,  SK TELECOM CO LTD ,  KT CORP ,  HANARO TELECOM INC ,  LEE YU-RO ,  KWON DONG-SEUNG

    Inventor： LEE YU-RO ,  KWON DONG-SEUNG

    IPC: H04B17/00 ,  H04B1/10 ,  H04J11/00 ,  H04L12/26

    CPC classification number: H04L1/20 ,  H04B1/1027 ,  H04B17/336 ,  H04L27/2647

    Abstract: A device and method for estimating a carrier to interference-plus-noise ratio (CINR) in an OFDM system are provided. The CINR estimating method includes (a) receiving a preamble symbol and transmit subcarrier transmitted from a base station; (b) calculating an interference power and noise power using the preamble symbol and transmit subcarrier; (c) calculating a receive power used for the base station to transmit a preamble and data symbol; (d) estimating a preamble CINR value using an interference power, a noise power, and a receive power; (e) calculating the noise power from a subcarrier not transmitting a preamble; and (f) calculating an average CINR of data subcarriers using the preamble CINR value and the noise power. With such a method, a precise carrier to interference-plus-noise ratio (CINR) can be estimated using a preamble when the preamble power is amplified in comparison with the data symbol power, the subcarriers are differently applied for the respective cells, and the traffic of the data area is partially loading.

    Abstract translation: 提供了用于估计OFDM系统中的载波干扰加噪声比（CINR）的设备和方法。 CINR估计方法包括：（a）接收从基站发送的前导符号和发送子载波; （b）使用前导符号和发射子载波来计算干扰功率和噪声功率; （c）计算用于基站发送前导码和数据符号的接收功率; （d）使用干扰功率，噪声功率和接收功率来估计前导码CINR值; （e）从不发送前导码的副载波计算噪声功率; 和（f）使用前导码CINR值和噪声功率来计算数据副载波的平均CINR。 利用这种方法，当与数据符号功率相比放大前导码功率时，可以使用前导码来估计精确的载波与干扰加噪声比（CINR），子载波被不同地应用于各个小区，并且 数据区域的流量部分加载。

    TRANSMISSION METHOD OF DATA IN MULTI-USER WIRELESS COMMUNICATION SYSTEM
    9.
    发明申请
    TRANSMISSION METHOD OF DATA IN MULTI-USER WIRELESS COMMUNICATION SYSTEM 审中-公开
    多用户无线通信系统中的数据传输方法

    公开(公告)号：WO2011053069A3

    公开(公告)日：2011-10-20

    申请号：PCT/KR2010007573

    申请日：2010-10-30

    Applicant: KOREA ELECTRONICS TELECOMM ,  LEE YU-RO ,  OH JONG-EE ,  LEE SOK-KYU

    Inventor： LEE YU-RO ,  OH JONG-EE ,  LEE SOK-KYU

    IPC: H04B7/02 ,  H04L27/10

    CPC classification number: H04B7/0452 ,  H04L1/0003 ,  H04L1/0009 ,  H04L1/0015 ,  H04L1/08 ,  H04L25/0204

    Abstract: The present invention particularly relates to a method and an apparatus for improving the efficiency of data transmission in a multi-user wireless transmission system. According to one embodiment of the present invention, the method, which is a transmission method of data in a multi-user wireless communication system, comprises the steps of: estimating channel states of each terminal through sounding or feedback information received from the terminals, and selecting terminals to which individual data are to be transmitted at the same time; determining a signal to noise ratio of the selected terminals, and calculating a precoding matrix; calculating a modulation and coding scheme (MCS) of each terminal and the number of symbols of data fields in accordance with the MCS of each terminal; dividing an area according to the number of terminals to which the data fields are to be simultaneously transmitted, if there are two or more selected terminals; and recalculating a reception signal to interference and noise ratio (SINR) for each area of each terminal, configuring a packet by resetting the MCS according to the recalculated SINR, and transmitting the configured packet.

    Abstract translation: 本发明特别涉及一种用于提高多用户无线传输系统中的数据传输效率的方法和装置。 根据本发明的一个实施例，作为多用户无线通信系统中的数据的传输方法的方法包括以下步骤：通过从终端接收的探测或反馈信息来估计每个终端的信道状态，以及 选择要同时发送单个数据的终端; 确定所选终端的信噪比，并计算预编码矩阵; 根据每个终端的MCS计算每个终端的调制和编码方案（MCS）和数据字段的符号数; 如果存在两个或更多个所选择的终端，则根据要同时发送数据字段的终端数量划分一个区域; 并重新计算每个终端的每个区域的接收信号与干扰和噪声比（SINR），通过根据重新计算的SINR重新设置MCS来配置分组，并发送配置的分组。

    METHOD FOR TRANSMITTING CONTROL AND TRAINING SYMBOLS IN MULTI-USER WIRELESS COMMUNICATION SYSTEM
    10.
    发明申请
    METHOD FOR TRANSMITTING CONTROL AND TRAINING SYMBOLS IN MULTI-USER WIRELESS COMMUNICATION SYSTEM 审中-公开
    在多用户无线通信系统中发送控制和训练符号的方法

    公开(公告)号：WO2011053070A3

    公开(公告)日：2011-09-01

    申请号：PCT/KR2010007574

    申请日：2010-10-30

    Applicant: KOREA ELECTRONICS TELECOMM ,  LEE YU-RO ,  SON JUNG-BO ,  LEE SOK-KYU

    Inventor： LEE YU-RO ,  SON JUNG-BO ,  LEE SOK-KYU

    IPC: H04W28/06 ,  H04B7/04

    CPC classification number: H04W72/0406 ,  H04B7/0452 ,  H04L1/007 ,  H04L1/0072 ,  H04L1/0606 ,  H04L1/0612 ,  H04L5/0023 ,  H04L5/0053 ,  H04L5/0073 ,  H04W28/04 ,  H04W28/06 ,  H04W28/22 ,  H04W48/08 ,  H04W80/04 ,  H04W84/12

    Abstract: The present invention relates to a method and an apparatus for transmitting control and training symbols to improve transmission efficiency in a multi-user wireless communication system. The method for transmitting the control and training symbols in the multi-user wireless communication system according to one embodiment of the present invention comprises the steps of: determining whether a required transmission rate of each data can be satisfied through channel estimation in each of terminals when different data are simultaneously transmitted to each of the terminals; and transmitting a data frame to each of the terminals, the data frame being composed to discriminate the control and training symbols in each of the terminals using a combination of time, frequency, and code area when the required transmission rate of each data is not satisfied according to the determined result.

    Abstract translation: 本发明涉及用于传送控制和训练符号以提高多用户无线通信系统中的传输效率的方法和装置。 根据本发明的一个实施例的用于在多用户无线通信系统中发送控制和训练符号的方法包括以下步骤：当在每个终端中通过信道估计来确定是否能够满足每个数据的所需传输速率时 不同的数据被同时发送到每个终端; 以及向每个终端发送一个数据帧，当不满足每个数据的所需传输速率时，该数据帧被组合以使用时间，频率和代码区域的组合来区分每个终端中的控制和训练符号 根据确定的结果。

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