公开(公告)号：US20080240217A1

公开(公告)日：2008-10-02

申请号：US12064115

申请日：2006-08-18

申请人： Yu-Ro Lee ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  Dong-Seung Kwon

IPC分类号： H04B17/00

CPC分类号： H04L27/2647 ,  H04B17/336

摘要： 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.

摘要翻译： 提供了一种用于估计OFDM系统中的载波与干扰加噪声比（CINR）的装置和方法。 CINR估计方法包括（a）接收前导符号并发送从基站发送的副载波; （b）使用前导码符号和发送子载波来计算干扰功率和噪声功率; （c）计算用于所述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）从不发送前同步码的子载波中计算噪声功率; 以及（f）使用前导码CINR值和噪声功率来计算数据子载波的平均CINR。 利用这种方法，当与数据符号功率相比，当前同步码功率被放大时，可以使用前导码来估计精确的载波与干扰加噪声比（CINR），对于各个小区，子载波被不同地应用， 数据区的流量正在部分加载。

公开(公告)号：US20080043858A1

公开(公告)日：2008-02-21

申请号：US10584716

申请日：2004-10-27

申请人： Hyoung-Soo Lim ,  Choong-Il Yeh ,  Yu-Ro Lee ,  Dong-Seung Kwon ,  Seung-Ku Hwang

发明人： Hyoung-Soo Lim ,  Choong-Il Yeh ,  Yu-Ro Lee ,  Dong-Seung Kwon ,  Seung-Ku Hwang

IPC分类号： H04K1/10

CPC分类号： H04J11/00 ,  H04L27/2613 ,  H04L27/2656 ,  H04L27/2675

摘要： 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.

摘要翻译： 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，并且检测互相关绝对值超过预定阈值的时刻来获取帧同步。 否则，通过使用包含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，可以获取帧同步。

公开(公告)号：US08305875B2

公开(公告)日：2012-11-06

申请号：US12096874

申请日：2006-07-25

申请人： Hyung-Soo Lim ,  Yu-Ro Lee ,  Dong-Seung Kwon

发明人： Hyung-Soo Lim ,  Yu-Ro Lee ,  Dong-Seung Kwon

IPC分类号： H04J11/00 ,  H04B7/216

CPC分类号： H04L5/0021 ,  H04J13/0048 ,  H04J13/18 ,  H04L5/0007 ,  H04L5/0039 ,  H04L5/0064 ,  H04L5/0073

摘要： 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.

摘要翻译： 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。

公开(公告)号：US08077792B2

公开(公告)日：2011-12-13

申请号：US11636780

申请日：2006-12-11

申请人： Yu-Ro Lee ,  In-Kyeong Choi ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  In-Kyeong Choi ,  Dong-Seung Kwon

IPC分类号： H04B7/02 ,  H04L1/02

CPC分类号： H04W52/42 ,  H04B7/0434 ,  H04L5/0023 ,  H04L5/0044 ,  H04L5/0053 ,  H04L5/006 ,  H04L5/0085 ,  H04L5/0096 ,  H04L25/0204 ,  H04L25/021 ,  H04L25/0228 ,  H04L25/0248 ,  H04L25/03343 ,  H04L2025/03414 ,  H04L2025/03426 ,  H04L2025/03802 ,  H04W52/04 ,  H04W52/346

摘要： In a method for allocating transmission power in a communication system including multiple antennas, a plurality of subcarriers are grouped by a plurality of groups, and each group includes at least one subcarrier. A transmission power weight and an antenna transmission vector are calculated for each group by using channel information, a transmission power for each group of each antenna is calculated by using the transmission power weight and the antenna transmission vector for each group, and transmission signals are transmitted through the multiple antennas after determining which signals need to be transmitted from the multiple antennas by using the transmission power.

摘要翻译： 在包括多个天线的通信系统中分配发送功率的方法中，多个子载波被多个组分组，每个组包括至少一个子载波。 通过使用信道信息为每个组计算发送功率权重和天线发送矢量，通过使用每组的发送功率权重和天线发送矢量来计算每个天线的每组的发送功率，并且发送发送信号 在通过使用发送功率确定需要从多个天线发送哪些信号之后，通过多个天线。

公开(公告)号：US08019021B2

公开(公告)日：2011-09-13

申请号：US12064115

申请日：2006-08-18

申请人： Yu-Ro Lee ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  Dong-Seung Kwon

IPC分类号： H04L27/00

CPC分类号： H04L27/2647 ,  H04B17/336

摘要： A device and a method for estimating a Carrier to Interference-plus-Noise Ratio (CINR) in an Orthogonal Frequency Division Multiplexing (OFDM) system are provided. The CINR estimating method includes receiving a preamble symbol and transmitting subcarrier transmitted from a base station, calculating an interference power and noise power using the preamble symbol and transmitting subcarrier, calculating a receive power used for the base station to transmit a preamble and data symbol, estimating a preamble CINR value using an interference power, a noise power, and a receive power, calculating the noise power from a subcarrier not transmitting a preamble, and calculating an average CINR of data subcarriers using the preamble CINR value and the noise power. Accordingly, a precise CINR can be estimated using a preamble when the preamble power is amplified in comparison with the data symbol power.

摘要翻译： 提供了一种用于估计正交频分复用（OFDM）系统中的载波与干扰加噪声比（CINR）的装置和方法。 CINR估计方法包括接收前导符号并发送从基站发送的子载波，使用前导符号和发送子载波来计算干扰功率和噪声功率，计算用于基站发送前导码和数据符号的接收功率， 使用干扰功率，噪声功率和接收功率估计前导码CINR值，从不发送前导码的子载波中计算噪声功率，以及使用前导码CINR值和噪声功率来计算数据子载波的平均CINR。 因此，当与数据符号功率相比，当前同步码功率被放大时，可以使用前导码来估计精确的CINR。

公开(公告)号：US07321584B2

公开(公告)日：2008-01-22

申请号：US10256935

申请日：2002-09-27

申请人： Yu-Ro Lee ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  Dong-Seung Kwon

IPC分类号： H04J3/06

CPC分类号： H04B1/7077 ,  H04B1/7083 ,  H04B2201/70702

摘要： A 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 and comparing frame values of the primary synchronization codes to determine a position of the maximum value; a correlation module for estimating a phase value and acquiring a first correlation value; 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.

摘要翻译： 用于时分双工系统中的移动台的小区搜索系统包括：主同步码搜索模块，用于搜索主同步码并比较主同步码的帧值以确定最大值的位置; 相关模块，用于估计相位值并获得第一相关值; 第二同步码搜索模块，用于根据最大值的位置产生确定性变量并存储它们; 用于检测决定性变量的最大值的比较和决定模块，将其与存储在次同步码搜索模块中的值进行比较以对匹配值进行计数，并将计数值与系统值进行比较，以确定时隙同步和组获取 成功了 以及基站确定模块，用于确定中间码和接收信号之间的第二相关值，并选择其最大值以确定基站。

公开(公告)号：USRE44284E1

公开(公告)日：2013-06-11

申请号：US12692373

申请日：2010-01-22

申请人： Yu-Ro Lee ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  Dong-Seung Kwon

IPC分类号： H04J3/06

CPC分类号： H04B1/7077 ,  H04B1/7083 ,  H04B2201/70702

摘要： A 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 and comparing frame values of the primary synchronization codes to determine a position of the maximum value; a correlation module for estimating a phase value and acquiring a first correlation value; 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.

公开(公告)号：US07761112B2

公开(公告)日：2010-07-20

申请号：US11653764

申请日：2007-01-16

申请人： Yu-Ro Lee ,  Een-Kee Hong ,  Dong-Cheol Kim ,  Hyun-Joon Shin ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  Een-Kee Hong ,  Dong-Cheol Kim ,  Hyun-Joon Shin ,  Dong-Seung Kwon

IPC分类号： H04B7/00 ,  H04B17/00

CPC分类号： H04W52/146 ,  H04L5/023 ,  H04L27/2626 ,  H04W52/10 ,  H04W52/225 ,  H04W52/243

摘要： A power controlling device in a mobile communication system, and a method thereof. A base station calculates an average interference of N previous frames, and broadcasts the average interference to subscriber stations. The subscriber stations determine transmission power based on the average interference. Noise and Interference (NI) of frames within a section corresponding to a setting size is calculated (the frames may include a current frame) so an estimated interference is close to the interference generated in the frame in which the subscriber station actually transmits a signal. In addition, to more precisely estimate the NI, the NI of the current frame is compensated according to a value and is broadcast.

摘要翻译： 移动通信系统中的功率控制装置及其方法。 基站计算N个先前帧的平均干扰，并且向用户台广播平均干扰。 用户台根据平均干扰确定发射功率。 计算与设定大小相对应的部分内的帧的噪声和干扰（帧）可以包括当前帧），所以估计的干扰接近在用户站实际发送信号的帧中产生的干扰。 另外，为了更准确地估计NI，当前帧的NI根据值进行补偿并被广播。

公开(公告)号：US20080225975A1

公开(公告)日：2008-09-18

申请号：US11574725

申请日：2005-02-28

申请人： Seung-Joon Lee ,  Choong-Il Yeh ,  Dong-Seung Kwon ,  Seung-Ku Hwang ,  Hyoung-Soo Lim ,  In-Kyeong Choi ,  Jong-Ee Oh ,  Kwang-Jae Lim ,  Seong-Rag Kim ,  Young-Seog Song ,  Yu-Ro Lee ,  Seong-Keun Oh ,  Moon-Ii Lee

发明人： Seung-Joon Lee ,  Choong-Il Yeh ,  Dong-Seung Kwon ,  Seung-Ku Hwang ,  Hyoung-Soo Lim ,  In-Kyeong Choi ,  Jong-Ee Oh ,  Kwang-Jae Lim ,  Seong-Rag Kim ,  Young-Seog Song ,  Yu-Ro Lee ,  Seong-Keun Oh ,  Moon-Ii Lee

IPC分类号： H04B7/02

CPC分类号： H04B7/02 ,  H04B7/0697 ,  H04L1/0612

摘要： A space-time code used for a transmitter to transmit a plurality of data symbols to a receiver in a MIMO system, the space-time code including a code word matrix for transmitting an amount of data symbols corresponding to a product of the number of transmit antennas and a spatial multiplexing rate during one block period, wherein a row index indicates combined signals transmitted through different transmit antennas and a column index indicates time slots that correspond to the number of transmit antennas, and wherein the number of data symbols allocated to each transmit antenna in a code block corresponds to the spatial multiplexing rate, and the data symbols are combined by different combining coefficients for each transmit antenna at every time slot, and simultaneously transmitted through different transmit antennas, and each transmit antenna transmits a different set of data symbols at every time slot.

摘要翻译： 用于发射机的空时码将多个数据符号发送到MIMO系统中的接收机，所述时空码包括用于发送对应于发射次数的乘积的数据符号量的码字矩阵 天线和一个块周期内的空间多路复用率，其中行索引表示通过不同发射天线发射的组合信号，列索引指示对应于发射天线数的时隙，并且其中分配给每个发射的数据符号数 代码块中的天线对应于空间复用速率，并且通过在每个时隙对每个发射天线的不同组合系数组合数据符号，并且同时通过不同的发射天线发射，并且每个发射天线发射不同的数据符号集合 在每个时间段

公开(公告)号：US20070171811A1

公开(公告)日：2007-07-26

申请号：US11585481

申请日：2006-10-24

申请人： Yu-Ro Lee ,  Dong-Seung Kwon

发明人： Yu-Ro Lee ,  Dong-Seung Kwon

IPC分类号： H04J11/00 ,  H04Q7/00

CPC分类号： H04B7/061 ,  H04B7/0671 ,  H04B7/068 ,  H04B7/12 ,  H04L27/2626

摘要： The present invention relates to a transmitting apparatus of an OFDMA system and a method thereof. The transmitting apparatus includes an encoder for modulating data to be transmitted into data or a preamble by using a desired modulation scheme; an S/P converter for converting serial data output from the encoder to parallel data; a preamble or pilot generator for generating a pilot or preamble; a multiplexer for multiplexing the data or preamble output from the preamble or pilot generator and the parallel data; an antenna selection controller for dividing an entire band of a signal output from the multiplexer into groups formed of neighboring symbols in time domain and neighboring subcarriers in frequency domain, and selecting a transmit antenna for each group; an IFFT unit for turning off subcarriers in groups selected by the antenna selection controller and subcarriers in unselected groups by the antenna selection controller and performing IFFT; for each antenna, a P/S converter for converting parallel signals transmitted from the IFFT unit into serial signals and inserting a cyclic prefix; and for each antenna, a D/A converter and filter for converting a digital signal transmitted from the P/S into an analog signal and filtering the analog signal, and transmitting the filtered analog signal through an antenna of an R/F end. Accordingly, when a transmitting end does not know a channel state of a transmit antenna, a transmit antenna is selected for an allocation unit and data is transmitted through the selected transmit antenna when a transmitting end of an OFDMA system using multiple antennas does not know a channel state, and accordingly a diversity gain can be acquired without making any changes in allocation of subcarriers according to the number of antennas, a transmission structure of a pilot of the transmitting end, an allocation structure of the transmitting end, and a receiving end. In addition, when the transmitting end does know the channel state, an antenna having the best channel state is selected for each group, and accordingly, performance degradation due to feedback delay of channel state information and inter-antenna interference due to an increase of mobility of the terminal can be prevented.