公开(公告)号：US07813435B2

公开(公告)日：2010-10-12

申请号：US11722028

申请日：2005-05-11

Applicant: Hyeong-Sook Park ,  Youn-Ok Park

Inventor： Hyeong-Sook Park ,  Youn-Ok Park

IPC: H04K1/10

CPC classification number: H04L27/2608

Abstract: The present invention relates to a method for allocating subcarriers in an orthogonal frequency division multiplex (OFDM) system, and a transmitter thereof. In the OFDM system according to an exemplary embodiment of the present invention, the subcarrier allocation is performed in the buffer (10) before a modulation mapping operation is performed according to a modulation method such that the delay may not be generated in the subchannel formed on the symbol axis. The delay corresponding to the symbols is prevented without using any additional hardware for eliminating the delay generated when the subcarriers are allocated to the subchannel formed on the symbol axis.

Abstract translation: 本发明涉及一种用于在正交频分复用（OFDM）系统中分配子载波的方法及其发射机。 在根据本发明的示例性实施例的OFDM系统中，在根据调制方法执行调制映射操作之前，在缓冲器（10）中执行子载波分配，使得可以在形成的子信道中不产生延迟 符号轴。 防止对应于符号的延迟，而不使用任何额外的硬件来消除当子载波被分配到在符号轴上形成的子信道时产生的延迟。

公开(公告)号：US07796577B2

公开(公告)日：2010-09-14

申请号：US11721421

申请日：2005-11-22

Applicant: Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

Inventor： Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

IPC: H04J1/00 ,  H04J11/00 ,  H04W4/00 ,  H04B1/40 ,  H04B1/034 ,  H03D7/16

CPC classification number: H04L27/265 ,  H04L27/263

Abstract: The present invention provides a method for designing operation schedules of a fast Fourier transform (FFT) and a multiple input multiple output orthogonal frequency division multiplexing modem (MIMO-OFDM modem) thereof. According to the present invention, an operation speed of an FFT operator is set up, a receiving symbol is arranged in an OFDM symbol duration in an FFT after receiving the symbol, a transmitting symbol is arranged in an OFDM symbol duration in the FFT schedule before transmitting the symbol, a transmitting/receiving symbol which has the same timing is inserted into an idle symbol duration of the FFT schedule, an FFT schedule which is good to be deleted is deleted, and symbols of the deleted FFT schedule are re-arranged in order to not have an error occur in transmitting/receiving timing.

Abstract translation: 本发明提供一种用于设计快速傅立叶变换（FFT）及其多输入多输出正交频分复用调制解调器（MIMO-OFDM调制解调器）的操作计划的方法。 根据本发明，建立FFT运算符的运算速度，在接收到符号之后，在FFT中以OFDM符号持续时间方式布置接收符号，在FFT调度表中以OFDM符号持续时间内排列发送符号 发送符号时，将具有相同定时的发送/接收符号插入到FFT调度的空闲符号持续时间中，删除良好被删除的FFT调度，并且将删除的FFT调度的符号重新排列在 为了在发送/接收定时中不发生错误。

公开(公告)号：US20100216459A1

公开(公告)日：2010-08-26

申请号：US11721153

申请日：2005-11-30

Applicant: Chang-Wahn Yu ,  Youn-Ok Park

Inventor： Chang-Wahn Yu ,  Youn-Ok Park

IPC: H04W36/00

CPC classification number: H04J11/0069 ,  H04J13/0022

Abstract: A cell search device using an appropriate preamble for a downlink of a cellular system using an orthogonal frequency division multiplexing access (OFDMA) scheme and a method thereof is disclosed. The cell search device for a terminal of a cellular system using an orthogonal frequency division multiplexing access scheme includes when the terminal receives a preamble symbol from a base station, a PN code and phase delay estimating unit for generating a code with the received preamble symbol and a combination of a PN code and a Walsh code, calculating a correlation value therebetween using a differential demodulation for the codes to detect the PN code, a plurality of Walsh codes, and an error of a time delay, and estimating a component of a phase delay for the time delay; and a Walsh code estimating unit for minimizing the influence of the time error using the phase delay and the PN code information obtained by the differential demodulation of the PN code and phase delay estimating unit and estimating a Walsh code for the corresponding cell by synchronization demodulation.

Abstract translation: 公开了一种使用正交频分复用接入（OFDMA）方案的蜂窝系统的下行链路的适当前导码的小区搜索装置及其方法。 用于使用正交频分复用接入方式的蜂窝系统的终端的小区搜索装置包括当终端从基站接收到前导码符号时，PN码和相位延迟估计单元用于产生具有接收到的前导码符号的码， PN码和沃尔什码的组合，使用用于检测PN码的代码的差分解调，多个沃尔什码和时间延迟的误差来计算其间的相关值，并且估计相位的分量 延迟延迟; 以及沃尔什码估计单元，用于使用相位延迟和通过PN码和相位延迟估计单元的差分解调获得的PN码信息来最小化时间误差的影响，并通过同步解调估计相应小区的沃尔什码。

公开(公告)号：US07782989B2

公开(公告)日：2010-08-24

申请号：US11636797

申请日：2006-12-11

Applicant: Seung-Jae Bahng ,  Youn-Ok Park ,  Chang-Wahn Yu ,  Eon-Young Hong

Inventor： Seung-Jae Bahng ,  Youn-Ok Park ,  Chang-Wahn Yu ,  Eon-Young Hong

IPC: H04L7/00

CPC classification number: H04L27/2656 ,  H04L27/2676

Abstract: Disclosed is an apparatus for acquiring initial frame timing in a communication system having a normalizer that calculates a normalized window power from powers of samples of received signal during a monitoring period, a cross power calculator that calculates a window cross power from cross powers of the samples during the monitoring period, and each cross power corresponds to multiplication of two of the samples, a divider that divides the window cross power by the normalized window power and outputs a metric for a sample corresponding to the monitoring period, and a peak-value detector that searches a sample having the maximum value among metrics for the samples of the received signals during a predetermined period, and the metrics are calculated by shifting the monitoring period, with a sample next to the sample searched by the peak-value detector being determined as a starting point of a frame.

Abstract translation: 公开了一种用于在具有归一化器的通信系统中获取初始帧定时的装置，该归一化器根据监视期间的接收信号的采样功率计算归一化窗功率;交叉功率计算器，其从样本的交叉功率计算窗口交叉功率 在监视期间，并且每个交叉功率对应于两个样本的乘法，分频器将窗口交叉功率除以归一化窗功率，并输出对应于监视周期的样本的度量，以及峰值检测器 在预定时间段内搜索具有接收信号样本的度量中的最大值的样本，并且通过将监测周期移位，通过峰值检测器搜索的样本旁边的样本被确定为 一个框架的起点。

公开(公告)号：US07782966B2

公开(公告)日：2010-08-24

申请号：US11721155

申请日：2005-11-09

Applicant: Young-Ha Lee ,  Youn-Ok Park

Inventor： Young-Ha Lee ,  Youn-Ok Park

IPC: H04L27/28

CPC classification number: H04L27/22 ,  H04L1/0026 ,  H04L1/18 ,  H04L5/0007 ,  H04L5/0053 ,  H04L27/2647

Abstract: A base station demodulator according to the exemplary embodiment of the present invention includes a vector index demodulator, and a channel value detector. The vector index demodulator demodulates CQI or ARQ ACK/NACK channels by multiplying QPSK modulation signals transmitted as m subcarriers in a tile by m conjugate complexes corresponding to the m subcarriers, and determines the greatest value of the demodulation results as a vector index. The channel value detector inputs n vector indexes demodulated by the vector index demodulator to a first shift register, inputs n subsequent vector indexes to a second shift register, and detects a channel value for the CQI or the ARQ ACK/NACK by repeating the above vector index input to the first and second shift registers m-times.

Abstract translation: 根据本发明的示例性实施例的基站解调器包括矢量索引解调器和信道值检测器。 矢量索引解调器通过将通过m个子载波发送的QPSK调制信号乘以与m个子载波相对应的m个共轭复合来解调CQI或ARQ ACK / NACK信道，并将解调结果的最大值确定为向量索引。 信道值检测器将由向量索引解调器解调的n个向量索引输入到第一移位寄存器，将n个后续向量索引输入到第二移位寄存器，并通过重复上述向量来检测CQI或ARQ ACK / NACK的信道值 索引输入到第一和第二移位寄存器m次。

公开(公告)号：US20090147892A1

公开(公告)日：2009-06-11

申请号：US12204464

申请日：2008-09-04

Applicant: Hoon LEE ,  Chang Wahn YU ,  Youn Ok PARK

Inventor： Hoon LEE ,  Chang Wahn YU ,  Youn Ok PARK

IPC: H04B1/10

CPC classification number: H04L25/03159 ,  H04L27/2647

Abstract: An apparatus for canceling interference includes a plurality of converters, a plurality of interference cancellation units, a plurality of variance detectors, and an output selecting unit. The plurality of converters converts a plurality of received signals to a plurality of frequency domain signals, respectively. The plurality of interference cancellation units cancel interference in the plurality of frequency domain signals using a plurality of interference cancellation schemes to generate a plurality of interference-canceled signals corresponding to the plurality of interference cancellation schemes, respectively. The plurality of variance detectors measure a plurality of amounts of residual interference corresponding to the plurality of interference-canceled signals, respectively. The output selecting unit selects a single interference-canceled signal with the least amount of residual interference from the plurality of interference-canceled signals, based on the plurality of amounts of residual interference.

Abstract translation: 用于消除干扰的装置包括多个转换器，多个干扰消除单元，多个方差检测器和输出选择单元。 多个转换器将多个接收信号分别转换成多个频域信号。 多个干扰消除单元使用多个干扰消除方案来消除多个频域信号中的干扰，以分别产生与多个干扰消除方案对应的多个干扰消除信号。 多个方差检测器分别测量与多个干扰消除信号相对应的多个残余干扰量。 输出选择单元基于多个残留干扰量从多个干扰消除信号中选择具有最小残留干扰量的单个干扰消除信号。

公开(公告)号：US20080144756A1

公开(公告)日：2008-06-19

申请号：US11923622

申请日：2007-10-24

Applicant: Hyeong-Sook PARK ,  Jun-Woo KIM ,  Kyung-Yeol SOHN ,  Youn-Ok PARK

Inventor： Hyeong-Sook PARK ,  Jun-Woo KIM ,  Kyung-Yeol SOHN ,  Youn-Ok PARK

IPC: H04L7/02

CPC classification number: H04L7/042 ,  H04B1/7075 ,  H04L27/261 ,  H04L27/2655 ,  H04L27/2675

Abstract: The present invention relates to an apparatus and method of acquiring initial synchronization of a terminal in a mobile communication system. According to an exemplary embodiment of the present invention, one or more auto-correlation values of a preamble constituting a signal that is received from a base station are calculated. Averages of the calculated auto-correlation values according to samples are calculated, and then a peak value is detected among the calculated values. Then, a cell search is performed on the basis of the detected peak value, and a peak value from the result of the cell search is regularized. Then, the regularized peak value is compared with a predetermined reference value such that it is checked whether synchronization of a signal that has been searched is accurate or not. According to an exemplary embodiment of the present invention, a value obtained by regularizing a result of a cell search is compared with a reference value, and it is checked again whether an accurate start point of a frame is detected or not on the basis of a result of the comparison. Accordingly, false alarm rates can be reduced.

Abstract translation: 本发明涉及在移动通信系统中获取终端的初始同步的装置和方法。 根据本发明的示例性实施例，计算构成从基站接收的信号的前导码的一个或多个自相关值。 计算根据样本计算的自相关值的平均值，然后在计算值之间检测峰值。 然后，基于检测到的峰值执行小区搜索，并且从小区搜索结果的峰值正规化。 然后，将正则化峰值与预定参考值进行比较，以便检查已搜索的信号的同步是否准确。 根据本发明的示例性实施例，将通过对小区搜索的结果进行规则化而获得的值与参考值进行比较，并且再次检查是否基于a检测到帧的准确起点 比较结果。 因此，可以降低误报率。

公开(公告)号：US20080123517A1

公开(公告)日：2008-05-29

申请号：US11720605

申请日：2005-11-10

Applicant: Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

Inventor： Jun-Woo Kim ,  Jae-Gun Jung ,  Youn-Ok Park

IPC: H04J11/00

CPC classification number: H04L27/2662 ,  H04L5/0007 ,  H04L5/0016 ,  H04L25/03866 ,  H04L27/2602 ,  H04L27/2656 ,  H04L27/2678

Abstract: A receiving apparatus of a mobile terminal receiving a signal in a synchronous OFDM system under a multi-cell environment, including a demodulation start controller performing frame synchronization and cell search using a received signal and outputting information on a demodulation start point and a to-be-demodulated neighbor cell; a FFT unit converting a time-domain signal into a frequency-domain signal; a scramble code generator generating scramble codes for the to-be-demodulated neighbor cell from the demodulation start controller and the current cell; a correlator multiplying a signal from the FFT unit and scramble codes from the scramble code generator and outputting correlation signals; demodulators provided corresponding to a current cell and a maximum number of neighbor cells to be demodulated, and demodulating the correlation signals; and a decoder decoding signals from the demodulators and restoring original information transmitted from the corresponding cell.

Abstract translation: 一种在多小区环境下在同步OFDM系统中接收信号的移动终端的接收装置，包括：解调启动控制器，使用接收信号执行帧同步和小区搜索，并输出关于解调起始点和待机信号的信息 调制相邻单元; 将时域信号转换为频域信号的FFT单元; 扰码代码生成器，用于从解调起始控制器和当前小区为待解调的相邻小区生成扰码; 相关器将来自FFT单元的信号和来自加扰码发生器的扰码相乘并输出相关信号; 对应于当前小区提供的解调器和要被解调的最大数量的相邻小区，以及对相关信号进行解调; 以及解码器，对来自解调器的信号进行解码并恢复从相应的单元发送的原始信息。

公开(公告)号：US20070291633A1

公开(公告)日：2007-12-20

申请号：US11667938

申请日：2005-09-07

Applicant: Dae-Ho Kim ,  Jun-Woo Kim ,  Youn-Ok Park

Inventor： Dae-Ho Kim ,  Jun-Woo Kim ,  Youn-Ok Park

IPC: H04J11/00

CPC classification number: H04L27/2626 ,  H04L5/023

Abstract: The present invention relates to a transmitter of an OFDMA system capable of controlling a gain for variation of subchannel allocation, and a method thereof. The transmitter includes a subchannel number determining unit, a modulator, a digital/analogue converter, and a gain controller controlling the gain. The subchannel number determining unit determines the number of subchannels in use according to communication environments, and the modulator modulates transmission data with reference to the number of subchannels determined by the subchannel number determining unit and outputs the modulated transmission data. The digital/analogue converter converts the transmission data into analogue data and transmits the converted analogue data through a transmit antenna. The gain controller controls gains of the transmission data according to gain values corresponding to the number of subchannels.

Abstract translation: 本发明涉及能够控制用于子信道分配变化的增益的OFDMA系统的发射机及其方法。 发射机包括子信道号确定单元，调制器，数/模转换器和控制增益的增益控制器。 子信道号确定单元根据通信环境确定正在使用的子信道的数量，并且调制器参照由子信道号确定单元确定的子信道的数量来调制发送数据，并输出调制的发送数据。 数字/模拟转换器将传输数据转换为模拟数据，并通过发送天线发送转换的模拟数据。 增益控制器根据对应于子信道数量的增益值控制传输数据的增益。

公开(公告)号：US08897225B2

公开(公告)日：2014-11-25

申请号：US13565832

申请日：2012-08-03

Applicant: Hoon Lee ,  Seungjae Bahng ,  Jun Woo Kim ,  Youn Ok Park

Inventor： Hoon Lee ,  Seungjae Bahng ,  Jun Woo Kim ,  Youn Ok Park

IPC: H04B1/66 ,  H04W80/04 ,  H04W40/06 ,  H04W88/08 ,  H04W28/04

CPC classification number: H04W40/06 ,  H04W28/04 ,  H04W80/04 ,  H04W88/08

Abstract: The present invention relates to a communication path control apparatus for controlling a communication path between a plurality of DUs and a plurality of RFUs, and a plurality of antennas included in the plurality of RFUs and a wireless communication system including the communication path control apparatus. Each of the plurality of DUs, the plurality of RFUs, and the plurality of antennas has a unique identifier, and the path control apparatus controls paths between the plurality of DUs and the plurality of RFUs based on identifiers. Accordingly, the wireless communication system can transmit and receive a signal through a specific RFU and a specific antenna included in a specific RFU and performs the next-generation wireless BS operation method, such as CoMP and multi-BS MIMO.

Abstract translation: 本发明涉及一种用于控制多个DU与多个RFU之间的通信路径的通信路径控制装置，以及包括在多个RFU中的多个天线以及包括通信路径控制装置的无线通信系统。 多个DU，多个RFU和多个天线中的每一个具有唯一的标识符，并且路径控制装置基于标识符来控制多个DU与多个RFU之间的路径。 因此，无线通信系统可以通过特定RFU中包含的特定RFU和特定天线来发送和接收信号，并且执行诸如CoMP和多BS MIMO的下一代无线BS操作方法。