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    Apparatus and method for transmitting and receiving a pilot signal in a communication system using a multi-carrier modulation scheme
    32.
    发明申请
    Apparatus and method for transmitting and receiving a pilot signal in a communication system using a multi-carrier modulation scheme 审中-公开
    在使用多载波调制方案的通信系统中发送和接收导频信号的装置和方法

    公开(公告)号：US20050084035A1

    公开(公告)日：2005-04-21

    申请号：US10932854

    申请日：2004-09-02

    申请人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Ho-Jin Kim ,  Sang-Boh Yun

    发明人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Ho-Jin Kim ,  Sang-Boh Yun

    IPC分类号： H04L27/04 ,  H04L27/26

    CPC分类号： H04L27/2657 ,  H04L27/2613 ,  H04L27/2662

    摘要： In an MCM communication system in which one frame includes at least one pilot symbol of a predetermined length and at least one data symbol of the predetermined length, to transmit the pilot symbol for time synchronization and frequency synchronization, a first pilot sequence of a length shorter than the predetermined length is generated, and a second pilot sequence of a length shorter than the predetermined length is generated. Here, the second pilot sequence is different from the first pilot sequence. The first and second pilot sequences are repeated a predetermined number of times. The pilot symbol is generated by combining the repeated first and second pilot sequences, and then transmitted.

    摘要翻译： 在其中一帧包括预定长度的至少一个导频符号和预定长度的至少一个数据符号的MCM通信系统中，为了发送用于时间同步和频率同步的导频符号，发送长度较短的第一导频序列 产生预定长度，并且产生长度短于预定长度的第二导频序列。 这里，第二导频序列与第一导频序列不同。 第一和第二导频序列重复预定次数。 通过组合重复的第一和第二导频序列来生成导频符号，然后发送。

    Velocity estimation apparatus in mobile communication environments
    33.
    发明授权
    Velocity estimation apparatus in mobile communication environments 有权
    移动通信环境中的速度估计装置

    公开(公告)号：US07515902B2

    公开(公告)日：2009-04-07

    申请号：US11143074

    申请日：2005-06-02

    申请人： Goo-Hyun Park ,  Dae-Sik Hong ,  Ye-Hoon Lee ,  Eung-Sun Kim ,  Myeon-Gyun Cho ,  Jong-Hyeuk Lee

    发明人： Goo-Hyun Park ,  Dae-Sik Hong ,  Ye-Hoon Lee ,  Eung-Sun Kim ,  Myeon-Gyun Cho ,  Jong-Hyeuk Lee

    IPC分类号： H04Q7/20

    CPC分类号： G01S11/10 ,  H04W64/006

    摘要： Disclosed is a method for estimating the velocity of a mobile station in Rician fading environments in which a direct wave exists. Cellular mobile communication environments include two environments, Rician fading environments in which a direct wave exists and Rayleigh fading environments in which a direct wave does not exist. Generally, many methods for estimating the velocity of a mobile station have been known in Rayleigh fading environments. However, in Rician fading environments in which a direct wave exists, many errors occurs in estimating the velocity of a mobile station due to difficulty in estimation of a Rician coefficient K and an incident angle θ0. According to the invention, a method is provided wherein error is mostly eliminated in estimating the velocity of a mobile station by obtaining a maximum Doppler frequency of the mobile station, even without directly obtaining a Rician coefficient K and an incident angle θ0.

    摘要翻译： 公开了一种用于估计在存在直接波的Rician衰落环境中的移动台的速度的方法。 蜂窝移动通信环境包括两个环境，其中存在直接波的Rician衰落环境和不存在直接波的瑞利衰落环境。 通常，用于估计移动台的速度的许多方法在瑞利衰落环境中是已知的。 然而，在存在直接波的Rician衰落环境中，由于难以估计Rician系数K和入射角θ0，在估计移动台的速度时出现许多错误。 根据本发明，提供了一种方法，其中即使没有直接获得Rician系数K和入射角θ0，通过获得移动台的最大多普勒频率来估计移动台的速度，大多数地消除了误差。

    Method for grouping transmission antennas in mobile communication system including multiple transmission/reception antennas
    34.
    发明授权
    Method for grouping transmission antennas in mobile communication system including multiple transmission/reception antennas 有权
    在包括多个发送/接收天线的移动通信系统中对发送天线进行分组的方法

    公开(公告)号：US07483719B2

    公开(公告)日：2009-01-27

    申请号：US10988947

    申请日：2004-11-15

    申请人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Jae-Hak Chung ,  Ho-Jin Kim ,  Joo-Hwan Chun ,  Kyung-Chun Lee ,  Il-Han Kim

    发明人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Jae-Hak Chung ,  Ho-Jin Kim ,  Joo-Hwan Chun ,  Kyung-Chun Lee ,  Il-Han Kim

    IPC分类号： H04M1/00

    CPC分类号： H04B7/0874 ,  H04B7/0691

    摘要： Disclosed is a method for configuring transmission antenna groups in a mobile communication system with multiple transmission antennas and multiple reception antennas. The method includes the steps of: receiving a first matrix having a size of ‘Nt×Nt’, which corresponds to Nt number of transmission antennas, fedback from the mobile terminal, generating combinations of sub-matrixes of the first matrix corresponding to Nr number of reception antennas, and calculating sums of maximum eigenvalues; determining combinations of the sub-matrixes having a maximum value from among the calculated sums of eigenvalues to be transmission antenna groups for the Nt number of transmission antennas; and transmitting different relevant symbols from each other through the transmission antenna groups.

    摘要翻译： 公开了一种在具有多个发送天线和多个接收天线的移动通信系统中配置发送天线组的方法。 该方法包括以下步骤：从移动终端接收具有大小为NtxNt的第一矩阵，其对应于Nt个发送天线，产生与Nr个接收数相对应的第一矩阵的子矩阵的组合 天线，并计算最大特征值的和; 确定具有最大值的子矩阵的组合，其中所计算的特征值之和作为N t个发射天线的发射天线组; 并通过发射天线组彼此发送不同的相关符号。

    Method for allocating subchannels in an OFDMA mobile communication system
    35.
    发明授权
    Method for allocating subchannels in an OFDMA mobile communication system 有权
    在OFDMA移动通信系统中分配子信道的方法

    公开(公告)号：US07411924B2

    公开(公告)日：2008-08-12

    申请号：US10996699

    申请日：2004-11-24

    申请人： Yoon-Ok Cho ,  Yong-Hoon Lee ,  Young-Ho Jung ,  Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Jae-Hak Chung ,  Chang-Soo Hwang ,  Seung-Hoon Nam

    发明人： Yoon-Ok Cho ,  Yong-Hoon Lee ,  Young-Ho Jung ,  Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Jae-Hak Chung ,  Chang-Soo Hwang ,  Seung-Hoon Nam

    IPC分类号： H04Q7/24

    CPC分类号： H04L5/023 ,  H04L1/0003 ,  H04L1/0015 ,  H04L27/2608

    摘要： An adaptive modulation scheme relating to an RA problem for maximizing the transmission rates of all users for maximum transmission rates in an OFDMA system including some users requiring to use services at fixed data rates. The scheme proposes introduction of an adaptive modulation using linear programming into an existing scheme for a system including a single kind of users, thereby enabling simultaneous execution of the adaptive modulation for all users in a system including two kinds of users. Further, the invention proposes another scheme of sequentially allocating subchannels to the users when the fixed transmission rate has a sufficiently small value, in order to reduce the complexity.

    摘要翻译： 一种与RA问题有关的自适应调制方案，用于在包括一些需要以固定数据速率的业务的用户的OFDMA系统中最大化所有用户的最大传输速率的传输速率。 该方案提出了使用线性规划的自适应调制引入到包括单一用户的系统的现有方案中，从而能够在包括两种用户的系统中为所有用户同时执行自适应调制。 此外，为了降低复杂度，本发明提出了当固定传输速率具有足够小的值时向用户顺序分配子信道的另一方案。

    Transmitter and receiver in an orthogonal frequency division multiplexing system using an antenna array and methods thereof
    37.
    发明申请
    Transmitter and receiver in an orthogonal frequency division multiplexing system using an antenna array and methods thereof 审中-公开
    使用天线阵列的正交频分复用系统中的发射机和接收机及其方法

    公开(公告)号：US20060087960A1

    公开(公告)日：2006-04-27

    申请号：US11116909

    申请日：2005-04-28

    申请人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Jong-Bu Lim

    发明人： Eung-Sun Kim ,  Jong-Hyeuk Lee ,  Gi-Hong Im ,  Jong-Bu Lim

    IPC分类号： H04J11/00

    CPC分类号： H04B7/02 ,  H04L1/0048 ,  H04L1/005 ,  H04L1/0055 ,  H04L1/0606 ,  H04L27/2602

    摘要： A new diversity scheme for orthogonal frequency division multiplexing/multi-input multi-output (OFDM/MIMO) systems. The new diversity scheme, i.e., turbo layered space-frequency coded OFDM (TLSFC-OFDM), uses the turbo principle with space hopping (SH). The TLSFC-OFDM system uses a successive interference cancellation (SIC) algorithm to reduce the number of iterations. As a result, this scheme reduces computational complexity. Simulation results show that the SIC-based TLSFC-OFDM system outperforms a conventional OFDM/Horizontal Bell Labs Layered Space-Time (H-BLAST) system using a horizontal coding scheme.

    摘要翻译： 一种用于正交频分复用/多输入多输出（OFDM / MIMO）系统的新分集方案。 新的分集方案，即turbo分层空间频率编码的OFDM（TLSFC-OFDM），使用具有空间跳变（SH）的turbo原理。 TLSFC-OFDM系统使用连续干扰消除（SIC）算法来减少迭代次数。 因此，该方案降低了计算复杂度。 仿真结果表明，基于SIC的TLSFC-OFDM系统优于使用水平编码方案的常规OFDM /水平贝尔实验室分层时空（H-BLAST）系统。

    Symbol timing synchronization method for OFDM based communication system
    38.
    发明申请
    Symbol timing synchronization method for OFDM based communication system 审中-公开
    基于OFDM的通信系统的符号定时同步方法

    公开(公告)号：US20050180516A1

    公开(公告)日：2005-08-18

    申请号：US11047422

    申请日：2005-01-31

    申请人： Sang-Jin Lee ,  Jong-Soo Seo ,  Eung-Sun Kim ,  Jong-Hyeuk Lee

    发明人： Sang-Jin Lee ,  Jong-Soo Seo ,  Eung-Sun Kim ,  Jong-Hyeuk Lee

    IPC分类号： H04J11/00 ,  H04K1/10 ,  H04L27/26

    CPC分类号： H04L27/2662 ,  H04L27/2607 ,  H04L27/2678

    摘要： A synchronization method in an OFDM based communication system. A transmitting side generates and transmits an OFDM symbol having a constant cyclic prefix, independent of time domain data symbols that are to be transmitted. A receiving side estimates a timing synchronization error based on the known cyclic prefix. Because the timing synchronization error is estimated based on the constant cyclic prefix, which is always known, a highly reliable correlation is achieved, thereby improving the accuracy of synchronization.

    摘要翻译： 基于OFDM的通信系统中的同步方法。 发送侧生成并发送具有恒定循环前缀的OFDM符号，与待发送的时域数据符号无关。 接收侧基于已知的循环前缀来估计定时同步误差。 由于定时同步误差是基于始终是已知的恒定循环前缀来估计的，所以实现了高度可靠的相关性，从而提高了同步的准确性。

    Orthogonal frequency division multiplexing communication system, multi-hop system, relay station, and spatially layered transmission mode
    40.
    发明授权
    Orthogonal frequency division multiplexing communication system, multi-hop system, relay station, and spatially layered transmission mode 有权
    正交频分复用通信系统，多跳系统，中继站，空间分层传输模式

    公开(公告)号：US08189696B2

    公开(公告)日：2012-05-29

    申请号：US12080650

    申请日：2008-04-03

    申请人： Jong-Hyeuk Lee ,  Sang-Boh Yun ,  Joo-Hyun Lee ,  Dae-Sik Hong ,  Hyung-Joon Song

    发明人： Jong-Hyeuk Lee ,  Sang-Boh Yun ,  Joo-Hyun Lee ,  Dae-Sik Hong ,  Hyung-Joon Song

    IPC分类号： H04L27/28

    CPC分类号： H04L5/0007 ,  H04B7/155 ,  H04L25/03057 ,  H04L25/03178 ,  H04L2001/0097

    摘要： An apparatus and method for data transmission in an Orthogonal Frequency Division Multiplexing (OFDM) communication system are provided. An OFDM system includes a reference Relay Station (RS) and a cooperative relay station respectively for performing an Spatially Layered transmission Mode (SLM) process by modulating a phase and magnitude of a signal by using a predetermined modulation order suitable for the reference relay station to obtain a spatially-layered signal and for delivering the spatially-layered signal to a target Mobile Station (MS); a Base Station (BS) for selecting the reference relay station and the cooperative relay station among a plurality of relay stations; and an mobile station for detecting data through Maximum Likelihood (ML) detection in which a signal having the largest ML is detected by comparing the received spatially-layered signal with a signal which is converted through the SLM upon receiving the spatially-layered signal from the reference relay station and the cooperative relay station.

    摘要翻译： 提供了一种用于正交频分复用（OFDM）通信系统中的数据传输的装置和方法。 OFDM系统包括参考中继站（RS）和协作中继站，分别用于通过使用适合于参考中继站的预定调制顺序来调制信号的相位和幅度来执行空间分层传输模式（SLM）处理 获得空间分层信号并将空间分层信号传送到目标移动站（MS）; 用于在多个中继站中选择参考中继站和协作中继站的基站（BS）; 以及用于通过最大似然（ML）检测来检测数据的移动站，其中通过将接收到的空间分层信号与从所述SLM接收到的空间分层信号中经过SLM转换的信号进行比较来检测具有最大ML的信号 参考中继站和合作中继站。